This page has only limited features, please log in for full access.
In this study, alginate-immobilization of microalgae combined with continuous/intermittent algae-based membrane bioreactor (A-MBR) and external ceramic membrane was developed to investigate the effect of immobilization on algal growth, nutrient removal, algal organic matter (AOM) and membrane fouling control in synthetic secondary wastewater effluent treatment. First, Chlorella vulgaris and Scenedesmus quadricauda were selected to investigate the treatment performance, AOM characteristics and membrane fouling control between suspended and immobilized microalgae. The results showed the effect of immobilization on two microalgae growth was not significant and nearly complete NO3−-N and PO43−-P removals were achieved by both immobilized microalgae in batch experiments, contributing from algal uptake as well as chemical precipitation. In addition, fluorescence excitation-emission matrix spectra indicated specific intensity of protein- and soluble microbial byproduct-like peaks in AOM derived from immobilized S. quadricauda was lower than C. vulgaris and reduced recently produced AOM from two immobilized microalgae was observed, which would improve membrane fouling control. After 35-day intermittent A-MBR operation with immobilized S. quadricauda, higher concentration of microalgal biomass and 63% NO3−-N and 58% PO43−-P removals were achieved. In addition, alginate-immobilization and intermittent operation for relaxation of membrane showed slower decline of permeate flux under constant pressure mode and therefore, were beneficial for membrane fouling control. Hence, the intermittent A-MBR with immobilized microalgae has potential to cultivate microalgae, provide stable treatment performance to remove nutrients and limit membrane fouling in secondary wastewater effluent treatment.
Pei-Hsun Wu; Tsung-Min Hsieh; Hung-Yu Wu; Chang-Ping Yu. Characterization of the immobilized algae-based bioreactor with external ceramic ultrafiltration membrane to remove nutrients from the synthetic secondary wastewater effluent. International Biodeterioration & Biodegradation 2021, 164, 105309 .
AMA StylePei-Hsun Wu, Tsung-Min Hsieh, Hung-Yu Wu, Chang-Ping Yu. Characterization of the immobilized algae-based bioreactor with external ceramic ultrafiltration membrane to remove nutrients from the synthetic secondary wastewater effluent. International Biodeterioration & Biodegradation. 2021; 164 ():105309.
Chicago/Turabian StylePei-Hsun Wu; Tsung-Min Hsieh; Hung-Yu Wu; Chang-Ping Yu. 2021. "Characterization of the immobilized algae-based bioreactor with external ceramic ultrafiltration membrane to remove nutrients from the synthetic secondary wastewater effluent." International Biodeterioration & Biodegradation 164, no. : 105309.
Sewage sludge (SS) is an organic biomass from wastewater treatment plants, but the use of SS to produce bio-based chemicals under acid-catalyzed hydrolysis (ACH) processes is not well investigated. In this study, ACH processes were performed at 120, 150, and 180 °C using sulfuric acid (H2SO4) with concentrations of 0–0.5 M within a reaction time of 90–180 min to produce bio-based chemicals from SS. The results showed that the reaction temperature, reaction time, and concentrations of H2SO4 affected the yields of sugars, levulinic acid (LA), and 5-hydroxymethylfurfural (HMF). The highest xylose and glucose yields were 7.69 mol% and 5.22 mol% at 120 °C with 0.5 M H2SO4 during the 180 min of reaction time, respectively. Besides, under the ACH process at 180 °C and 180 min, the yield of LA reached a maximum value of 0.48 mol% at 0.5 M H2SO4, and the highest yield of HMF was 1.66 mol% at 0.1 M H2SO4. The data obtained also indicated that the ACH process led to an increase in soluble chemical oxygen demand, dissolved organic carbon, and total dissolved nitrogen. Fluorescence excitation-emission matrix of dissolved organic matter and thermogravimetric analysis of the treated SS further supported the enhanced solubilization of SS after ACH process, especially under higher reaction temperature and concentrations of H2SO4. Although the lower yields of bio-based chemicals might restrict the downstream recovery of the target products, the largely improved SS solubilization by ACH suggests that acid-catalyzed hydrothermal hydrolysis process has potential as an alternative pretreatment method of SS.
Van Toi Pham; Chung-Yu Guan; Po-Chun Han; Babasaheb M. Matsagar; Kevin C. W. Wu; Tansir Ahamad; Ching-Yuan Chang; Chang-Ping Yu. Acid-catalyzed hydrothermal treatment of sewage sludge: effects of reaction temperature and acid concentration on the production of hydrolysis by-products. Biomass Conversion and Biorefinery 2021, 1 -14.
AMA StyleVan Toi Pham, Chung-Yu Guan, Po-Chun Han, Babasaheb M. Matsagar, Kevin C. W. Wu, Tansir Ahamad, Ching-Yuan Chang, Chang-Ping Yu. Acid-catalyzed hydrothermal treatment of sewage sludge: effects of reaction temperature and acid concentration on the production of hydrolysis by-products. Biomass Conversion and Biorefinery. 2021; ():1-14.
Chicago/Turabian StyleVan Toi Pham; Chung-Yu Guan; Po-Chun Han; Babasaheb M. Matsagar; Kevin C. W. Wu; Tansir Ahamad; Ching-Yuan Chang; Chang-Ping Yu. 2021. "Acid-catalyzed hydrothermal treatment of sewage sludge: effects of reaction temperature and acid concentration on the production of hydrolysis by-products." Biomass Conversion and Biorefinery , no. : 1-14.
Bioenergy plays a pivotal role in replacing fossil fuels, limiting carbon emissions, and supporting the transformation of low-carbon societies. However, bioenergy crop production requires irrigation and the presence of specific soil and weather conditions, resulting in certain environmental impacts due to uneven resource allocation and depletion. Nexus repercussions occur when activities in an individual sector are mismanaged and impact other nexus sectors. This study applies a quantitative nexus approach to quantify, clarify, manage, and mitigate the repercussions and interlinkages between the water, energy, and land sectors. An assessment process is established to locate cultivable idle land, evaluate water availability, and estimate additional energy consumption. Districts are categorized into three groups based on their bioethanol capacity and water availability and are assigned development priorities. Undesirably, many districts that possess the most extensive suitable idle land are projected to face water challenges, so nexus repercussion analysis is applied to develop mitigation strategies, restrain intersystem impact dissemination effects, and sufficiently utilize their capacities. The range of expected mitigation achievement points for these districts varies from 8 million m3 to 66 million m3. Some districts can reach positive water availability and achieve a mitigation ratio higher than 50%. Districts are able to eliminate nexus repercussions from energy consumption and effectively reduce the pressures of water shortages. This study can help policymakers comprehend the limitations of regional water-energy interdependency networks (WEINs) and help them govern nexus repercussions at a manageable level, avoid runaway dissemination occurrences, and strengthen the resilience of WEINs.
Li-Heng Chen; Pei-Chiun Li; Yupo Lin; I-Chun Chen; Hwong-Wen Ma; Chang-Ping Yu. Establishing a quantification process for nexus repercussions to mitigate environmental impacts in a water-energy interdependency network. Resources, Conservation and Recycling 2021, 171, 105628 .
AMA StyleLi-Heng Chen, Pei-Chiun Li, Yupo Lin, I-Chun Chen, Hwong-Wen Ma, Chang-Ping Yu. Establishing a quantification process for nexus repercussions to mitigate environmental impacts in a water-energy interdependency network. Resources, Conservation and Recycling. 2021; 171 ():105628.
Chicago/Turabian StyleLi-Heng Chen; Pei-Chiun Li; Yupo Lin; I-Chun Chen; Hwong-Wen Ma; Chang-Ping Yu. 2021. "Establishing a quantification process for nexus repercussions to mitigate environmental impacts in a water-energy interdependency network." Resources, Conservation and Recycling 171, no. : 105628.
In this study, we have immobilized bacterial cells with mediators as bioaugmentation to increase the numbers of bacterial cells in anodic biofilm for better microbial fuel cell (MFC) performance. Four individual bacterial strains (strain E1, strain SCS5, strain B2 and Shewanella putrefaciens) and their mixed culture were first evaluated for electricity production in MFCs. The mixed culture MFC produced higher power density (3.021 Wm−3) than pure strains. The pre-colonized (PC) biofilms together with mediator immobilized mixed culture (MIMC) beads as bioanodes further enhanced the performance of MFCs. Integrated PC/MIMC MFCs containing anthraquinine-2,6-disulfonate (AQDS) and Fe3O4 immobilized mixed culture beads produced 1.50 and 1.47 times power density with respect to mixed culture biofilm, respectively. AQDS immobilization showed better performance compared to Fe3O4 in energy output. The integrated use of PC biofilms and MIMC exhibited lower charge transfer resistance than corresponding individual anode biofilms in MFCs according to electrochemical impedance spectroscopy analysis. The MFC having PC/MIMC as anode showed the ability to store electrons generated by bacteria, but the biocapacitance of anode was altered after integrating MIMC bead particles. Thus, the collective use of PC biofilm and MIMC beads will be one of the potential choices for improving MFC performance.
Subed Chandra Dev Sharma; Jiangwei Li; Anyi Hu; Chao-Chin Chang; Chang-Ping Yu. Integration of pre-colonized and mediator immobilized mixed culture for the improvement of electricity production of microbial fuel cells. Environmental Technology & Innovation 2021, 22, 101514 .
AMA StyleSubed Chandra Dev Sharma, Jiangwei Li, Anyi Hu, Chao-Chin Chang, Chang-Ping Yu. Integration of pre-colonized and mediator immobilized mixed culture for the improvement of electricity production of microbial fuel cells. Environmental Technology & Innovation. 2021; 22 ():101514.
Chicago/Turabian StyleSubed Chandra Dev Sharma; Jiangwei Li; Anyi Hu; Chao-Chin Chang; Chang-Ping Yu. 2021. "Integration of pre-colonized and mediator immobilized mixed culture for the improvement of electricity production of microbial fuel cells." Environmental Technology & Innovation 22, no. : 101514.
Global mining of rare earth elements (REEs) has increased exponentially because of their modern technologies' applications. The recovery of REEs from secondary sources such as industrial wastewater and industrial sludge can reduce the radioactive wastes and greenhouse gases generated during their mining and processing, as well as numerous environmental pollutions from REEs commercial products. In this work, β-cyclodextrin hybrid ([email protected]3O4) was functionalized with 2-ethylhexyl phosphonic acid mono-2-ethylhexyl (PC88A) doped in silica. The synthesized composite, namely PCDP-M-SHM, performed better toward recovering REEs. The quantitative desorption of adsorbed REEs using dilute acidic solutions was achieved over five cycles without degradation in composite performance. More importantly, PCDP-M-SHM was found to selectively purify REEs from synthetic solutions and industrial wastewater in a continuous adsorption process with enrichment factors ranging from 10 to 30. Finally, the separation factor confirmed the effectiveness of PCDP-M-SHM to recover REEs from digested sludge with much higher distribution coefficients than coexisting elements. These results indicate that the synthesized adsorbent is a promising solution for REEs separation and purification from water.
François Nkinahamira; Alaaeddin Alsbaiee; Yuwen Wang; Xiaoyong Yang; Tian-Yuan Chen; Meixian Cao; Meiling Feng; Qian Sun; Chang-Ping Yu. Recovery and purification of rare earth elements from wastewater and sludge using a porous magnetic composite of β-cyclodextrin and silica doped with PC88A. Separation and Purification Technology 2021, 266, 118589 .
AMA StyleFrançois Nkinahamira, Alaaeddin Alsbaiee, Yuwen Wang, Xiaoyong Yang, Tian-Yuan Chen, Meixian Cao, Meiling Feng, Qian Sun, Chang-Ping Yu. Recovery and purification of rare earth elements from wastewater and sludge using a porous magnetic composite of β-cyclodextrin and silica doped with PC88A. Separation and Purification Technology. 2021; 266 ():118589.
Chicago/Turabian StyleFrançois Nkinahamira; Alaaeddin Alsbaiee; Yuwen Wang; Xiaoyong Yang; Tian-Yuan Chen; Meixian Cao; Meiling Feng; Qian Sun; Chang-Ping Yu. 2021. "Recovery and purification of rare earth elements from wastewater and sludge using a porous magnetic composite of β-cyclodextrin and silica doped with PC88A." Separation and Purification Technology 266, no. : 118589.
Estrogens are among the most concerned emerging contaminants in the wastewater treatment effluent due to their sexual disruption in aquatic wildlife. The use of microalgae for secondary wastewater effluent polishing is a promising approach due to the economic benefit and value-added products. In this study, three microalgae species, including Selenastrum capricornutum, Scenedesmus quadricauda and Chlorella vulgaris were selected to conduct batch experiments to examine important mechanisms, especially the role of algal extracellular organic matter (AEOM) on two selected estrogens (17β-estradiol, E2 and 17α-ethynylestradiol, EE2) removal. Results showed that estrogens could not be significantly degraded under visible light irradiation and adsorption of estrogens by microalgae was negligible. All three living microalgae cultures have ability to remove E2 and EE2, and Selenastrum capricornutum showed the highest E2 and EE2 removal efficiency of 91% and 83%, respectively, corresponding to the reduction of predicted estrogenic activity of 86%. AEOM from three microalgae cultures could induce photodegradation of estrogens, and AEOM from Selenastrum capricornutum and Chlorella vulgaris achieved 100% of E2 and EE2 removal under visible light irradiation. Fluorescence excitation–emission matrix spectroscopy identified humic/fulvic-like substances in AEOM from three microalgae cultures, which might be responsible for inducing the indirect photolysis of E2 and EE2. Therefore, in the living microalgae cultures, the major estrogens removal mechanisms should include biotransformation as well as AEOM meditated photocatalytic degradation. Since removal rates through photodegradation could be faster than biotransformation, the AEOM mediated photocatalytic degradation can play a potential role to remove emerging contaminants when using microalgae technology for wastewater effluent treatment.
Pei-Hsun Wu; Hsin-Yi Yeh; Pei-Hsin Chou; Wen-Wei Hsiao; Chang-Ping Yu. Algal extracellular organic matter mediated photocatalytic degradation of estrogens. Ecotoxicology and Environmental Safety 2020, 209, 111818 .
AMA StylePei-Hsun Wu, Hsin-Yi Yeh, Pei-Hsin Chou, Wen-Wei Hsiao, Chang-Ping Yu. Algal extracellular organic matter mediated photocatalytic degradation of estrogens. Ecotoxicology and Environmental Safety. 2020; 209 ():111818.
Chicago/Turabian StylePei-Hsun Wu; Hsin-Yi Yeh; Pei-Hsin Chou; Wen-Wei Hsiao; Chang-Ping Yu. 2020. "Algal extracellular organic matter mediated photocatalytic degradation of estrogens." Ecotoxicology and Environmental Safety 209, no. : 111818.
Microorganisms were observed to facilitate cathodic oxygen reduction and enhance cathode performance of microbial fuel cells (MFCs). However, the long-term activity and stability of bio-catalyzed cathode needs to be explored. This study evaluated the long-term performance of bio-catalyzed cathode and iron(II) phthalocyanine (FePc)-catalyzed cathode MFCs through effluent water quality, electricity production and electrochemical impedance spectroscopy (EIS) analysis under different scenarios, including conventional wastewater treatment and energy harvesting using a power management system (PMS). During the continuous operation, both systems demonstrated high chemical oxygen demand and ammonium removal, but bio-catalyzed cathode MFCs could achieve significantly better total nitrogen removal than FePc-catalyzed cathode MFCs. The FePc-coated cathode showed constant cathode potential during the entire operation period, but the biocathode showed varied but step-wise increased cathode potential to achieve more than 500 mV versus the standard hydrogen electrode, likely due to the gradual enrichment of biocathode biofilm. EIS analysis revealed that biocathode had higher ohmic resistance than bare carbon felt cathode but the microbial biofilm could largely decrease polarization resistance of cathode material. Microbial community analysis has shown the presence of nitrifying and denitrifying bacteria in the bio-catalyzed cathode biofilm. When connecting PMS, both bio-catalyzed cathode and FePc-catalyzed cathode MFCs successfully charged a capacitor, but the bio-catalyzed cathode MFC voltage significantly dropped to less than 100 mV after charging for 91 h, and gradually recovered when disconnecting PMS. This study has demonstrated the potential application of oxygen reduction bio-catalyzed cathode MFCs for continuous wastewater treatment and energy harvesting for long period of time.
Chao-Chin Chang; Shiue-Lin Li; Anyi Hu; Chang-Ping Yu. Long-term operation of bio-catalyzed cathodes within continuous flow membrane-less microbial fuel cells. Chemosphere 2020, 266, 129059 .
AMA StyleChao-Chin Chang, Shiue-Lin Li, Anyi Hu, Chang-Ping Yu. Long-term operation of bio-catalyzed cathodes within continuous flow membrane-less microbial fuel cells. Chemosphere. 2020; 266 ():129059.
Chicago/Turabian StyleChao-Chin Chang; Shiue-Lin Li; Anyi Hu; Chang-Ping Yu. 2020. "Long-term operation of bio-catalyzed cathodes within continuous flow membrane-less microbial fuel cells." Chemosphere 266, no. : 129059.
Wastewater containing high concentrations of antibiotics may inhibit the biological treatment processes, and it could also result in an increase in antibiotic resistant genes in the biological treatment system, causing risks in the environmental waters. Therefore, in this study, taking advantage of the unstable characteristics of tetracycline in alkaline conditions, dual-chamber microbial fuel cells (MFCs) were coupled with the heater to drive the alkaline thermal hydrolysis of tetracycline in the cathode chamber, making tetracycline degradation without contact with microorganisms in the anode chamber. It was observed that tetracycline degradation rates under closed circuit conditions were faster than those under open circuit conditions due to the rising pH in the cathode chamber of closed circuit MFCs, and the temperature increase could result in a decrease in half-life of tetracycline degradation. The TOC analysis showed that most TOC was not removed after 48 h reaction, suggesting tetracycline was mainly transformed to byproducts in the cathode chamber. High resolution mass spectrometry identified the transformation products resulting from the alkaline thermal hydrolysis of tetracycline, and the minimum pharmacophore of tetracycline was altered, which would lead to the loss of antibacterial activity. Microtox tests confirmed the reduction in the toxic effect of tetracycline to luminescent bacteria after treatment in the cathode chamber. Our results have demonstrated the effective degradation of tetracycline using MFC-driven alkaline thermal hydrolysis, which will have potential to be a pretreatment process to assist the subsequent biological treatment processes to destroy high concentrations of antibiotics in the wastewater.
Pin-Hsueh Wu; Yan Li; Pei-Hsun Wu; Chang-Ping Yu. Microbial fuel cell-driven alkaline thermal hydrolysis for pretreatment of wastewater containing high concentrations of tetracycline in the cathode chamber. Journal of Environmental Chemical Engineering 2020, 9, 104659 .
AMA StylePin-Hsueh Wu, Yan Li, Pei-Hsun Wu, Chang-Ping Yu. Microbial fuel cell-driven alkaline thermal hydrolysis for pretreatment of wastewater containing high concentrations of tetracycline in the cathode chamber. Journal of Environmental Chemical Engineering. 2020; 9 (1):104659.
Chicago/Turabian StylePin-Hsueh Wu; Yan Li; Pei-Hsun Wu; Chang-Ping Yu. 2020. "Microbial fuel cell-driven alkaline thermal hydrolysis for pretreatment of wastewater containing high concentrations of tetracycline in the cathode chamber." Journal of Environmental Chemical Engineering 9, no. 1: 104659.
Hydrothermal pretreatment (HTP) of sewage sludge (SS) has been shown to improve the subsequent biogas production by anaerobic digestion (AD), but the effect of catalysts on HTP performance was less explored. This study intended to investigate the SS pretreatment by wet air oxidation (WAO) with the addition of K2CO3 as a catalyst on the performance of methane production by AD. WAO was found to improve the solubilization of SS, the soluble chemical oxygen demand, dissolved organic carbon, and total dissolved nitrogen. The methane yield from WAO increased from 202 mL/gVSin with no catalyst added to 277 mL/gVSin with 10 wt% of K2CO3 added at 180 °C with 30 min of residence time. Under this pretreatment condition, the highest methane production rate could achieve 15.8 mL/gVSin day, and the percentage of methane reached 73%. The structure of the microbial community involved in the AD was affected by the residence time, working gas, and catalyst of the HTP process. The results showed that Bacteroidetes, Bacteroidia, and SC103 were the dominant phylum, class, and genus of bacteria, respectively, of almost all of the samples. In addition, the most abundant archaeal order was Methanosarcinales, while Methanosaeta was the dominant archaeal genus of most of the samples. However, Methanosarcina largely increased the relative abundance, corresponding to the amount of K2CO3 catalyst used. The findings in this study demonstrated the potential use of K2CO3 during WAO of SS and implied the link between shift of methanogen community and the enhanced methane yield in AD.
Van Toi Pham; Pei-Hsun Wu; Chung-Yu Guan; Chia-Chi Chang; Bo-Liang Liu; Ching-Yuan Chang; Chang-Ping Yu. Biogas Production and Microbial Communities in the Anaerobic Digestion of Sewage Sludge Under Hydrothermal Pretreatment with Air and a Catalyst. BioEnergy Research 2020, 1 -16.
AMA StyleVan Toi Pham, Pei-Hsun Wu, Chung-Yu Guan, Chia-Chi Chang, Bo-Liang Liu, Ching-Yuan Chang, Chang-Ping Yu. Biogas Production and Microbial Communities in the Anaerobic Digestion of Sewage Sludge Under Hydrothermal Pretreatment with Air and a Catalyst. BioEnergy Research. 2020; ():1-16.
Chicago/Turabian StyleVan Toi Pham; Pei-Hsun Wu; Chung-Yu Guan; Chia-Chi Chang; Bo-Liang Liu; Ching-Yuan Chang; Chang-Ping Yu. 2020. "Biogas Production and Microbial Communities in the Anaerobic Digestion of Sewage Sludge Under Hydrothermal Pretreatment with Air and a Catalyst." BioEnergy Research , no. : 1-16.
Plant microbial fuel cells (PMFCs) is a sustainable technology that can convert sunlight to electricity through the integration of plants, microorganism and electrode systems. Urban greening, such as green roofs, is considered as one of the measures to resolve the urban heat island effect caused by the increasing urbanization. In this study, PMFCs were installed as green roofs in a subtropical metropolis. During the operation, the biomass of Chinese pennisetum, Dwarf rotala, and Narrowleaf cattail increased from spring to summer. Furthermore, the maximum daily average output voltage of Chinese pennisetum and Narrowleaf cattail PMFCs was 667.94 ± 128.65 mV in March and 451.12 ± 94.37 mV in June, respectively. For no plant conditions, the maximum daily average output voltage of soil MFCs was 243.70 ± 128.93 mV in March and 100.16 ± 23.43 mV in June. However, little output voltage of Dwarf rotala PMFCs indicated different plant species in PMFC systems would result in varied efficiencies of electricity generation. The trends of electricity generation in Chinese pennisetum and Narrowleaf cattail PMFCs were influenced by net solar radiation and air temperature, respectively according to the results of correlation analysis. The PMFCs based green roofs could lower the temperature of underneath floor slabs as many as 24.81 °C and 29.37 °C compared with bare slabs at noon in March and June. Vegetation of the PMFCs could relieve soil heat flux, and simulated results showed Chinese pennisetum PMFCs with higher vegetation had lower U-value for energy savings of air conditioning. Microbial community analysis showed Geobacter was among the dominant genera and had higher relative abundance in anode soils than cathode soils in Chinese pennisetum and Narrowleaf cattail PMFCs, which generated higher output voltage. Our roof-top research demonstrated that using PMFCs based green roofs for urban greening is promising and warrants the potential for future application.
Chung-Yu Guan; Chang-Ping Yu. Evaluation of plant microbial fuel cells for urban green roofs in a subtropical metropolis. Science of The Total Environment 2020, 765, 142786 .
AMA StyleChung-Yu Guan, Chang-Ping Yu. Evaluation of plant microbial fuel cells for urban green roofs in a subtropical metropolis. Science of The Total Environment. 2020; 765 ():142786.
Chicago/Turabian StyleChung-Yu Guan; Chang-Ping Yu. 2020. "Evaluation of plant microbial fuel cells for urban green roofs in a subtropical metropolis." Science of The Total Environment 765, no. : 142786.
Heavy metal(loid)s and organic pollutants have garnered global concern due to their potential for bioaccumulation and carcinogenic effects. The aquatic environment is one of the most important receiving compartments for these pollutants. Therefore, researchers are committed to developing inexpensive and highly efficient technologies for the removal of these recalcitrant contaminants from water. Zero-valent iron (ZVI), which has a strong reduction ability, low cost and can be recycled, has been considered as an environmentally benign element for removal of heavy metal(loid)s and organic chlorinated pollutants. However, some factors limit the ZVI application, with passivation of ZVI considered as the main limitation. Recent research has focused on methods to eliminate or alleviate these interferences and maximize ZVI performance. This review summarizes recent findings for the removal of typical heavy metal(loid)s and organic pollutants in the aquatic environment by ZVI-based technologies. Different combinations of chemical, physical, biological, or other methods with ZVI and their operating conditions and influencing factors are presented and discussed. Finally, we also present the removal mechanisms of ZVI-based technologies and recommendations for future research. This review provides an up-to-date perspective on the removal of pollutants using ZVI-based technologies and collates references for future large-scale application to wastewater treatment.
Yang Wu; Chung-Yu Guan; Nicholas Griswold; Li-Yuan Hou; Xin Fang; Anyi Hu; Zhi-Qiang Hu; Chang-Ping Yu. Zero-valent iron-based technologies for removal of heavy metal(loid)s and organic pollutants from the aquatic environment: Recent advances and perspectives. Journal of Cleaner Production 2020, 277, 123478 .
AMA StyleYang Wu, Chung-Yu Guan, Nicholas Griswold, Li-Yuan Hou, Xin Fang, Anyi Hu, Zhi-Qiang Hu, Chang-Ping Yu. Zero-valent iron-based technologies for removal of heavy metal(loid)s and organic pollutants from the aquatic environment: Recent advances and perspectives. Journal of Cleaner Production. 2020; 277 ():123478.
Chicago/Turabian StyleYang Wu; Chung-Yu Guan; Nicholas Griswold; Li-Yuan Hou; Xin Fang; Anyi Hu; Zhi-Qiang Hu; Chang-Ping Yu. 2020. "Zero-valent iron-based technologies for removal of heavy metal(loid)s and organic pollutants from the aquatic environment: Recent advances and perspectives." Journal of Cleaner Production 277, no. : 123478.
Disposal of large quantities of waste cartons aggravates the burden of municipal solid waste treatment. Exploitation of the potential value of waste cartons and conversion of this waste stream into available materials is a hot research topic with practical application prospects. In this study, we successfully fabricated a magnetic carbon-iron composite from waste cartons via hydrothermal treatment and investigated its application as an efficient adsorbent for the removal of a disperse blue dye (DB 56) and reactive yellow dye (RY 3) from aqueous solution. The fabricated product was characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and Brunauer-Emmett-Teller analysis. The effects of the composite dose, initial dye concentration, and solution pH on the dye removal efficiency were investigated. Under acidic conditions at pH 2, the removal efficiencies of DB 56 and RY 3 reached 81.53% and 96.77%, respectively. The adsorption processes followed pseudo-second-order kinetics and the Freundlich isotherm. The magnetic carbon-iron composite could be easily separated from the aqueous solution because of its magnetism, and could be regenerated by the Fenton reaction. After re-use in three cycles, the removal efficiencies for both dyes were still above 70%. The magnetic carbon-iron composite produced from waste cartons shows promise for application to effluent that contains dyes because of its low cost, high efficiency, and simple application.
Yang Wu; Xiang-Tian Yang; Xin Fang; Xue-Rong Cheng; Anyi Hu; Li-Feng Lin; Chang-Ping Yu. Hydrothermal conversion of waste cartons into a magnetic carbon-iron composite for use as an efficient and recyclable dye adsorbent. Journal of Colloid and Interface Science 2020, 578, 717 -725.
AMA StyleYang Wu, Xiang-Tian Yang, Xin Fang, Xue-Rong Cheng, Anyi Hu, Li-Feng Lin, Chang-Ping Yu. Hydrothermal conversion of waste cartons into a magnetic carbon-iron composite for use as an efficient and recyclable dye adsorbent. Journal of Colloid and Interface Science. 2020; 578 ():717-725.
Chicago/Turabian StyleYang Wu; Xiang-Tian Yang; Xin Fang; Xue-Rong Cheng; Anyi Hu; Li-Feng Lin; Chang-Ping Yu. 2020. "Hydrothermal conversion of waste cartons into a magnetic carbon-iron composite for use as an efficient and recyclable dye adsorbent." Journal of Colloid and Interface Science 578, no. : 717-725.
The microbial fuel cell (MFC) is an emerging bioelectrochemical technology, which can harvest energy and purify wastewater simultaneously. Microorganisms not only have been shown critical to oxidize substrates to generate electricity in the anode, but have been used as the catalyst to improve the cathode performance. However, the scaled-up applicability of biocatalyzed cathodes (biocathodes) still needs to be explored. This study evaluated the electrochemical and treatment performance of long-term serial connection of oxygen reducing biocathode-based MFCs. Results showed that biocathode-based MFCs could reach stable wastewater treatment performance without influenced by serial connection. Voltage reversal shock was previously observed in bioanodes during serial connection, but our analysis of cathode potential demonstrated voltage reversal would also occur in biocathodes. Furthermore, our results revealed that the voltage reversal of biocathodes could be self-recoverable after roughly one month of operation, which is much longer than the reported duration in bioanodes. Electrochemical impedance spectroscopy analysis of the biocathode recovered from voltage reversal revealed the substantial increase of polarization resistance due to the capacitance effect. The output voltage of serially connected biocathode-based MFCs could be successfully harvested through charging the capacitor in the power management system. The 16S rRNA gene high throughput sequencing of biocathode samples revealed the presence of abundant nitrifying and denitrifying bacteria and moreover, the unique microbial composition in the biocathode recovered from voltage reversal with Thiothrix highly enriched (40.9%). Overall, these results suggested microbial community of biocathodes could shift to gain biofilm capacitance to overcome the voltage reversal shock during serial connection and warranted the need for further research on the scaled-up of biocathode-based MFCs.
Chao-Chin Chang; Wade Kao; Chang-Ping Yu. Assessment of voltage reversal effects in the serially connected biocathode-based microbial fuel cells through treatment performance, electrochemical and microbial community analysis. Chemical Engineering Journal 2020, 397, 125368 .
AMA StyleChao-Chin Chang, Wade Kao, Chang-Ping Yu. Assessment of voltage reversal effects in the serially connected biocathode-based microbial fuel cells through treatment performance, electrochemical and microbial community analysis. Chemical Engineering Journal. 2020; 397 ():125368.
Chicago/Turabian StyleChao-Chin Chang; Wade Kao; Chang-Ping Yu. 2020. "Assessment of voltage reversal effects in the serially connected biocathode-based microbial fuel cells through treatment performance, electrochemical and microbial community analysis." Chemical Engineering Journal 397, no. : 125368.
Plant microbial fuel cells are attractive for treating hexavalent chromium contaminated soils while generating renewable electricity. The end-of-service-life plant microbial fuel cells, however, may pose a risk to secondary pollution. In this study, we propose a novel valorization of Chinese pennisetum plant microbial fuel cell waste into levulinic acid using liquid or solid acid catalyst in green solvents, water and/or gamma-valerolactone, under microwave heating. The results showed that the use of 1 M sulfuric acid at 150 °C in 60 min can obtain approximately 15.2 C mol% of levulinic acid. In view of the use of gamma-valerolactone, the addition of H2O showed beneficial effects to improve levulinic acid yield by facilitating cellulose hydration and sugar dehydration-rehydration reactions, for instance, levulinic acid yield increased to 20 C mol% when gamma-valerolactone to water ratio changed from 100/0 v/v to 70/30 v/v. The scanning electron microscope images proved that the cellulose structure was recalcitrant in H2O under the catalysis of Amberlyst 36, while the cellulose structure was altered under gamma-valerolactone to water regardless of the type of catalysts. The X-ray diffraction patterns provided spectroscopic evidence for the enhanced dissolution or hydrolysis of cellulose in a short period of time. The thermal stability of the solid residues after microwave heating at 180 °C was enhanced due to polymerization reaction. The 13C solid-state Nuclear magnetic resonance spectra revealed that remaining gamma-valerolactone and polymerization byproducts were the major residues after the catalytic reaction under pure gamma-valerolactone or at high temperature. The measurement of total chromium and hexavalent chromium distribution confirmed that the metal pre-absorbed in plant biomass all remained in the solid phase, indicating the liquid phase was free of secondary pollution. The proposed valorization plan could innovatively utilize hazardous waste from plant microbial fuel cells to produce value-added chemicals in a sustainable way.
Chung-Yu Guan; Season S. Chen; Tzong-Huei Lee; Chang-Ping Yu; Daniel C.W. Tsang. Valorization of biomass from plant microbial fuel cells into levulinic acid by using liquid/solid acids and green solvents. Journal of Cleaner Production 2020, 260, 121097 .
AMA StyleChung-Yu Guan, Season S. Chen, Tzong-Huei Lee, Chang-Ping Yu, Daniel C.W. Tsang. Valorization of biomass from plant microbial fuel cells into levulinic acid by using liquid/solid acids and green solvents. Journal of Cleaner Production. 2020; 260 ():121097.
Chicago/Turabian StyleChung-Yu Guan; Season S. Chen; Tzong-Huei Lee; Chang-Ping Yu; Daniel C.W. Tsang. 2020. "Valorization of biomass from plant microbial fuel cells into levulinic acid by using liquid/solid acids and green solvents." Journal of Cleaner Production 260, no. : 121097.
The main goal of the analysis of microbial ecology is to understand the relationship between Earth’s microbial community and their functions in the environment. This paper presents a proof-of-concept research to develop a bioclimatic modeling approach that leverages artificial intelligence techniques to identify the microbial species in a river as a function of physicochemical parameters. Feature reduction and selection are both utilized in the data preprocessing owing to the scarce of available data points collected and missing values of physicochemical attributes from a river in Southeast China. A bio-inspired metaheuristic optimized machine learner, which supports the adjustment to the multiple-output prediction form, is used in bioclimatic modeling. The accuracy of prediction and applicability of the model can help microbiologists and ecologists in quantifying the predicted microbial species for further experimental planning with minimal expenditure, which is become one of the most serious issues when facing dramatic changes of environmental conditions caused by global warming. This work demonstrates a neoteric approach for potential use in predicting preliminary microbial structures in the environment.
Jui-Sheng Chou; Chang-Ping Yu; Dinh-Nhat Truong; Billy Susilo; Anyi Hu; Qian Sun. Predicting Microbial Species in a River Based on Physicochemical Properties by Bio-Inspired Metaheuristic Optimized Machine Learning. Sustainability 2019, 11, 6889 .
AMA StyleJui-Sheng Chou, Chang-Ping Yu, Dinh-Nhat Truong, Billy Susilo, Anyi Hu, Qian Sun. Predicting Microbial Species in a River Based on Physicochemical Properties by Bio-Inspired Metaheuristic Optimized Machine Learning. Sustainability. 2019; 11 (24):6889.
Chicago/Turabian StyleJui-Sheng Chou; Chang-Ping Yu; Dinh-Nhat Truong; Billy Susilo; Anyi Hu; Qian Sun. 2019. "Predicting Microbial Species in a River Based on Physicochemical Properties by Bio-Inspired Metaheuristic Optimized Machine Learning." Sustainability 11, no. 24: 6889.
Combined heat and power production from biogas is now playing an important role in energy and resource utilization as well as pollution control in waste water treatment. This research used biogas from the Bali Sewage Treatment Plant in New Taipei City, Taiwan, as a major source of fuel for the electricity generation. A micro gas turbine electricity generator, Capstone CR-30, which possesses a maximum rated power load (PWL) of 30 kW, was equipped to convert biogas into electricity. The biogas is mainly composed of CH4 (56.1 ± 8.0 vol.%), CO2 (25.5 ± 9.8 vol.%), H2 (0.5 vol.%), and H2S (0.99 ± 0.07 ppmv). During the test operation period of the generator, it was found that the thermal efficiency increases from 19.8% to 23.4% kWhe/kWhth, while the electricity generation efficiency (ηEB) also rises from 0.93 to 1.09 kWhe/m3 biogas as the PWL increases from 10 kW to 30 kW. The results indicated that the generator has a better performance with higher PWL. At PWL = 30 kW, the average adjusted concentrations of CO and NOx (adjusted to 15 vol.% O2) emitted from the generator are 86 ppmv and 17 ppmv, respectively. Both are much lower than the emission standards of stationary sources in Taiwan of 2000 ppmv and 150 ppmv, respectively. Thus, PWL of 30 kW was selected in cooperation with biogas inflow = 0.412 m3/min and air/fuel ratio (i.e., air/biogas ratio) = 76.0 vol./vol. for the long-term regular operation. At the above setting conditions for long-term operation, the generator continuously consumed the biogas and provided stable electricity generation at a rate of 19.64 kWhe/h for a 2-year running period. Moreover, the greenhouse gas can be cut off with a rate of 10.78 kg CO2e/h when using biogas as fuel for electricity generation. Overall, this research proves that the application of a micro gas turbine electricity generator not only has promising performance for using biogas but also gives a significant reduction of greenhouse gas emission, which fits the concepts of the circular economy and environmental protection.
Chia-Chi Chang; Manh Van Do; Wei-Li Hsu; Bo-Liang Liu; Ching-Yuan Chang; Yi-Hung Chen; Min-Hao Yuan; Cheng-Fang Lin; Chang-Ping Yu; Yen-Hau Chen; Je-Lueng Shie; Wan-Yi Wu; Chien-Hsien Lee; Trinh Van Tuyen. A Case Study on the Electricity Generation Using a Micro Gas Turbine Fuelled by Biogas from a Sewage Treatment Plant. Energies 2019, 12, 2424 .
AMA StyleChia-Chi Chang, Manh Van Do, Wei-Li Hsu, Bo-Liang Liu, Ching-Yuan Chang, Yi-Hung Chen, Min-Hao Yuan, Cheng-Fang Lin, Chang-Ping Yu, Yen-Hau Chen, Je-Lueng Shie, Wan-Yi Wu, Chien-Hsien Lee, Trinh Van Tuyen. A Case Study on the Electricity Generation Using a Micro Gas Turbine Fuelled by Biogas from a Sewage Treatment Plant. Energies. 2019; 12 (12):2424.
Chicago/Turabian StyleChia-Chi Chang; Manh Van Do; Wei-Li Hsu; Bo-Liang Liu; Ching-Yuan Chang; Yi-Hung Chen; Min-Hao Yuan; Cheng-Fang Lin; Chang-Ping Yu; Yen-Hau Chen; Je-Lueng Shie; Wan-Yi Wu; Chien-Hsien Lee; Trinh Van Tuyen. 2019. "A Case Study on the Electricity Generation Using a Micro Gas Turbine Fuelled by Biogas from a Sewage Treatment Plant." Energies 12, no. 12: 2424.
Natural and synthetic estrogens have been widely detected in wastewater treatment plant (WWTP) influent and effluent as well as in the corresponding receiving aqueous environment and other ecosystems. Microalgae can be used to remove nitrogen and phosphorus in wastewater, but the species-dependent removal of estrogens needs further investigation. In this study we investigated estrone, 17β-estradiol and 17α-ethynylestradiol removals and transformation products by four common microalgae Haematococcus pluvialis, Selenastrum capricornutum, Scenedesmus quadricauda, and Chlorella vulgaris. It was found that H. pluvialis, S. capricornutum and S. quadricauda could more effectively remove all three estrogens in synthetic wastewater effluent. The estrogenic activities i.e. 17β-estradiol equivalency determined by yeast estrogenic screening assay showed substantial estrogenic activity reductions after biotransformation by H. pluvialis, S. capricornutum, and S. quadricauda. Quadrupole Time-of-flight Mass Spectrometry results identified several possible ring-cleavage metabolites as well as their metabolic pathways, which had not been reported yet, confirming the estrogen degradation rather than mere absorption or uptake by microalgae. The findings demonstrate that not only can some specific bacteria degrade estrogens, but also the widely living microalgae are able to degrade these emerging pollutants, suggesting that microalgae could be an advanced treatment of WWTPs to remove nutrients and estrogens.
Yuwen Wang; Qian Sun; Yan Li; Hongjie Wang; Kun Wu; Chang-Ping Yu. Biotransformation of estrone, 17β-estradiol and 17α-ethynylestradiol by four species of microalgae. Ecotoxicology and Environmental Safety 2019, 180, 723 -732.
AMA StyleYuwen Wang, Qian Sun, Yan Li, Hongjie Wang, Kun Wu, Chang-Ping Yu. Biotransformation of estrone, 17β-estradiol and 17α-ethynylestradiol by four species of microalgae. Ecotoxicology and Environmental Safety. 2019; 180 ():723-732.
Chicago/Turabian StyleYuwen Wang; Qian Sun; Yan Li; Hongjie Wang; Kun Wu; Chang-Ping Yu. 2019. "Biotransformation of estrone, 17β-estradiol and 17α-ethynylestradiol by four species of microalgae." Ecotoxicology and Environmental Safety 180, no. : 723-732.
A novel method for efficiently removing low levels of ammonium contamination from the aqueous solution using clinoptilolite in a high-gravity rotating packed bed (HGRPB) was developed. Our batch experiments have shown that irregular clinoptilolite gave better ammonium removal efficiencies due to higher specific surface area, and the adsorption data fitted better using pseudo-second-order adsorption kinetics than pseudo-first-order adsorption kinetics. HGRPB experiments have demonstrated that increasing rotating speeds will improve ammonium removal due to higher mass transfer of ammonium between the liquid and solid phases. The removal efficiency was 90% at the end of the fifth cycle (∼54 min) at a rotating speed of 1500 rpm using irregular clinoptilolite, with an initial ammonium concentration of 12.5 mg-N/L in distilled water and a flow rate of 180 mL/min. However, the removal efficiency was obviously lower in pond water than that in distilled water because of possible competitive adsorption of other cations in the pond water, suggesting modification of clinoptilolite to increase its selectivity for ammonium will be critical. This study has demonstrated the potential of using clinoptilolite in the HGRPB system to remove low levels of ammonium contamination in water and warrants the research need of HGRPB for biphasic liquid–solid adsorption processes.
Yang Wu; Chia-Chi Chang; Chung-Yu Guan; Chao-Chin Chang; Jiang-Wei Li; Ching-Yuan Chang; Chang-Ping Yu. Enhanced removal of ammonium from the aqueous solution using a high-gravity rotating packed bed loaded with clinoptilolite. Separation and Purification Technology 2019, 221, 378 -384.
AMA StyleYang Wu, Chia-Chi Chang, Chung-Yu Guan, Chao-Chin Chang, Jiang-Wei Li, Ching-Yuan Chang, Chang-Ping Yu. Enhanced removal of ammonium from the aqueous solution using a high-gravity rotating packed bed loaded with clinoptilolite. Separation and Purification Technology. 2019; 221 ():378-384.
Chicago/Turabian StyleYang Wu; Chia-Chi Chang; Chung-Yu Guan; Chao-Chin Chang; Jiang-Wei Li; Ching-Yuan Chang; Chang-Ping Yu. 2019. "Enhanced removal of ammonium from the aqueous solution using a high-gravity rotating packed bed loaded with clinoptilolite." Separation and Purification Technology 221, no. : 378-384.
Food waste (FW) contributes to a great proportion in the municipal solid waste and is generated during disposal from different life cycles of food processing and consumption. FW treatment is a big challenge and there is an urgent need to develop a suitable treatment technology. The microbial fuel cell (MFC) is a promising bioelectrochemical technology using bacteria as the catalyst, which has been developed to effectively generate bioelectricity from diverse organic wastes. The present study investigated the treatment of food waste collected from a Chinese canteen using MFCs under different conditions. It was observed that the highest closed circuit voltage and maximum power density obtained were 775 ± 21 mV and 422 mW m-2, respectively, when using food waste with nutrient medium as the anolyte and permanganate as the catholyte. Under this condition, biodegradation processes in the MFCs could achieve 69 ± 18 % COD, 88 ± 5 % carbohydrate, 76 ± 9 % protein, 65 ± 8 % TOC and 71 ± 8 % total nitrogen removal. Microbial community analysis using 16S rRNA gene high-throughput sequencing showed Firmicutes, Bacteroidetes and Proteobacteria were the dominant phyla and Geobacter was the most abundant genus. Therefore, our microbial community results suggested that the mixture of exoelectrogenic and fermentative bacteria have a pronounced effect on MFCs system treating FW while affecting on organic degradation and energy production. A power management system was used to demonstrate that electricity from FW-fed MFCs can be successfully harvested to provide intermittent electricity to loads. Overall, this study demonstrated the potential of using MFCs for food waste treatment to achieve electricity production and waste reduction.
Bahareh Asefi; Shiue-Lin Li; Henry A. Moreno; Viviana Sanchez-Torres; Anyi Hu; Jiangwei Li; Chang-Ping Yu. Characterization of electricity production and microbial community of food waste-fed microbial fuel cells. Process Safety and Environmental Protection 2019, 125, 83 -91.
AMA StyleBahareh Asefi, Shiue-Lin Li, Henry A. Moreno, Viviana Sanchez-Torres, Anyi Hu, Jiangwei Li, Chang-Ping Yu. Characterization of electricity production and microbial community of food waste-fed microbial fuel cells. Process Safety and Environmental Protection. 2019; 125 ():83-91.
Chicago/Turabian StyleBahareh Asefi; Shiue-Lin Li; Henry A. Moreno; Viviana Sanchez-Torres; Anyi Hu; Jiangwei Li; Chang-Ping Yu. 2019. "Characterization of electricity production and microbial community of food waste-fed microbial fuel cells." Process Safety and Environmental Protection 125, no. : 83-91.
The plant microbial fuel cell (PMFC) is considered as a sustainable technology in which plants, microbes, and electrochemical cells are the major components and have the synergistic effect on electricity generation. Recent study has demonstrated the use of the PMFC system for remediation of hexavalent chromium (Cr(VI)) contaminated soils; however, the electrokinetic effects, fate of Cr and microbial community shift after long-term operation of PMFCs still need to be unveiled. In this study, PMFCs with spiking 50 mg/kg Cr(VI) were operated over 10 months and chemical and microbial characteristics of different locations of PMFC systems were investigated. Distinct chemical and microbial properties for different locations of soil samples were observed within PMFCs. For instance, the pH values of soils around the cathode and anode (cathode and anode soil) in PMFCs with Chinese pennisetum (Chinese pennisetum PMFCs) were 7.03 ± 0.15 and 6.09 ± 0.05 respectively, showing significantly higher pH values of cathode soils than those of anode soils. The electrical conductivity (EC) of cathode and anode soils in Chinese pennisetum PMFCs was 78.00 ± 5.61 and 156.25 ± 7.89 μs/cm respectively, showing significantly lower ECs of cathode soils than those of anode soils. The total Cr of cathode and anode soils in Chinese pennisetum PMFCs was 65.75 ± 3.77 and 84.29 ± 2.87 mg/kg respectively, showing significantly lower total Cr of cathode soils than that of anode soils. The permutational multivariate analysis of variance test of results of 16S rRNA gene high-throughput sequencing revealed that microbial communities in anode and cathode samples had significant difference in compositions. The stratified chemical and microbial characteristics between anode and cathode were primarily driven by the bioelectrochemical processes and electrokinetics effects within PMFCs. The findings in this study help to better understand the underlying effects of operating PMFCs and will be beneficial for future application of PMFCs in the remediation of heavy metal-contaminated soils.
Chung-Yu Guan; Anyi Hu; Chang-Ping Yu. Stratified chemical and microbial characteristics between anode and cathode after long-term operation of plant microbial fuel cells for remediation of metal contaminated soils. Science of The Total Environment 2019, 670, 585 -594.
AMA StyleChung-Yu Guan, Anyi Hu, Chang-Ping Yu. Stratified chemical and microbial characteristics between anode and cathode after long-term operation of plant microbial fuel cells for remediation of metal contaminated soils. Science of The Total Environment. 2019; 670 ():585-594.
Chicago/Turabian StyleChung-Yu Guan; Anyi Hu; Chang-Ping Yu. 2019. "Stratified chemical and microbial characteristics between anode and cathode after long-term operation of plant microbial fuel cells for remediation of metal contaminated soils." Science of The Total Environment 670, no. : 585-594.