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Dr. Zhongbing Chen
Czech University of Life Sciences Prague

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0 Biodiversity
0 Constructed Wetlands
0 Environmental Science
0 Wastewater Treatment
0 sludge treatment

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Journal article
Published: 21 July 2021 in Journal of Hazardous Materials
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In this study, a novel method—atom surface fragment contribution (ASFC)—was proposed for assessing the properties of compounds. We developed a predictive model using the ASFC method based on the sigma surface areas (Sσ-surface) of fragments/groups for estimating the toxicity of ILs. A toxicity dataset of 140 ILs towards leukemia rat cell line (ICP-81) was gathered and employed to train and validate models. The Sσ-surface values of atoms in each group were firstly calculated from the COSMO profiles of cations and anions for ILs. Then the Sσ-surface values of 26 groups were obtained and used as input descriptors for modelling. The R2 and MSE of the built ASFC model were 0.924 and 0.071, respectively. Results indicate that the ASFC model developed by the new approach possesses great accuracy and reliability. In total, the ASFC method has extensive potential for the application of estimating diverse properties of ILs and other compounds due to its remarkable advantages.

ACS Style

Xuejing Kang; Yongsheng Zhao; Zhongbing Chen. Atom surface fragment contribution method for predicting the toxicity of ionic liquids. Journal of Hazardous Materials 2021, 421, 126705 .

AMA Style

Xuejing Kang, Yongsheng Zhao, Zhongbing Chen. Atom surface fragment contribution method for predicting the toxicity of ionic liquids. Journal of Hazardous Materials. 2021; 421 ():126705.

Chicago/Turabian Style

Xuejing Kang; Yongsheng Zhao; Zhongbing Chen. 2021. "Atom surface fragment contribution method for predicting the toxicity of ionic liquids." Journal of Hazardous Materials 421, no. : 126705.

Journal article
Published: 09 July 2021 in Journal of Environmental Management
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This study investigated the role of arbuscular mycorrhizal fungal (AMF) for the removal of ibuprofen (IBU) and diclofenac (DCF) in constructed wetlands (CWs) with four different substrates. Results showed that AMF colonization in adsorptive substrate (perlite, vermiculite, and biochar) systems was higher than that in sand systems. AMF enhanced the tolerance of Glyceria maxima to the stress of IBU and DCF by promoting the activities of antioxidant enzymes (peroxidase and superoxide dismutase) and the contents of soluble protein, while decreasing the contents of malondialdehyde and O2•-. The removal efficiencies of IBU and DCF were increased by 15%–18% and 25%–38% in adsorptive substrate systems compare to sand systems. Adsorptive substrates enhanced the accumulation of IBU and DCF in the rhizosphere and promoted the uptake of IBU and DCF by plant roots. AMF promoted the removal of IBU and DCF in sand systems but limited their reduction in adsorptive substrate systems. In all scenarios, the presence of AMF decreased the contents of CECs metabolites (2-OH IBU, CA IBU, and 4′-OH IBU) in the effluents and promoted the uptake of IBU by plant roots. Therefore, these results indicated that the addition of adsorptive substrates could enhance the removal of IBU and DCF in CWs. The role of AMF on the removal of IBU and DCF was influenced by CW substrate. These may provide useful information for the application of AMF in CWs to remove contaminants of emerging concern.

ACS Style

Bo Hu; Shanshan Hu; Jan Vymazal; Zhongbing Chen. Arbuscular mycorrhizal symbiosis in constructed wetlands with different substrates: Effects on the phytoremediation of ibuprofen and diclofenac. Journal of Environmental Management 2021, 296, 113217 .

AMA Style

Bo Hu, Shanshan Hu, Jan Vymazal, Zhongbing Chen. Arbuscular mycorrhizal symbiosis in constructed wetlands with different substrates: Effects on the phytoremediation of ibuprofen and diclofenac. Journal of Environmental Management. 2021; 296 ():113217.

Chicago/Turabian Style

Bo Hu; Shanshan Hu; Jan Vymazal; Zhongbing Chen. 2021. "Arbuscular mycorrhizal symbiosis in constructed wetlands with different substrates: Effects on the phytoremediation of ibuprofen and diclofenac." Journal of Environmental Management 296, no. : 113217.

Journal article
Published: 21 April 2021 in Chemical Engineering Journal
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Arbuscular mycorrhizal fungi (AMF) can improve plant tolerance to heavy metal stress in the terrestrial system. However, the detoxification ability of AMF to heavy metals in aquatic systems remains poorly understood. This study investigated the effects of AMF on chromium (Cr) distribution and bioavailability in semi-aquatic habitats under different water depths. Results showed that AMF increased the Cr accumulation in the roots of Iris pseudacorus by 10.0–20.0%. Conversely, Cr concentrations in the shoots of AMF inoculated I. pseudacorus were 21.7–68.4% lower than those in the non-inoculated controls. Besides, Cr concentrations and mass contents in water were decreased by 34.1–35.3% and 15.4–23.3% under the low Cr stress (5 mg kg−1) with AMF inoculation compare to the non-inoculated treatments, respectively. Moreover, Cr (VI) concentrations in substrates under the Cr contents of 5 mg kg−1 were 27.0–44.0% lower than those under the non-inoculated controls. Meanwhile, AMF reduced the Cr bioavailability in substrates under the fluctuating water depth (water depth of 6–3 cm), with an acid-soluble state of Cr decreased by 4.1–5.6%. Furthermore, AMF also enhanced the biomass, nutrient contents (TC, TN, Ca, Mg, Fe, and Mn) in the I. pseudacorus under the fluctuating water depth. Therefore, it provides a possibility that AMF can be used to remove heavy metals from polluted wastewater by semi-aquatic habitats under fluctuating water depth (e.g. tidal flow constructed wetlands).

ACS Style

Shanshan Hu; Bo Hu; Zhongbing Chen; Miroslav Vosátka; Jan Vymazal. Arbuscular mycorrhizal fungi modulate the chromium distribution and bioavailability in semi-aquatic habitats. Chemical Engineering Journal 2021, 420, 129925 .

AMA Style

Shanshan Hu, Bo Hu, Zhongbing Chen, Miroslav Vosátka, Jan Vymazal. Arbuscular mycorrhizal fungi modulate the chromium distribution and bioavailability in semi-aquatic habitats. Chemical Engineering Journal. 2021; 420 ():129925.

Chicago/Turabian Style

Shanshan Hu; Bo Hu; Zhongbing Chen; Miroslav Vosátka; Jan Vymazal. 2021. "Arbuscular mycorrhizal fungi modulate the chromium distribution and bioavailability in semi-aquatic habitats." Chemical Engineering Journal 420, no. : 129925.

Journal article
Published: 27 February 2021 in Agronomy
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The main purpose of this study was to examine the impact of different phosphorus (P) fertilizers and organic manures alone and in combination with Bacillus sp. MN-54 on growth, yield, nutrient uptake, chlorophyll (SPAD value) and crude proteins content of chickpea. The simple manure (SM), processed manure (PM), single super phosphate (SSP), and rock phosphate (RP) were applied individually and in different combinations to the soil in pots, and the chickpea seeds treated with Bacillus sp. MN-54 were sown in the selective pots. Results showed that individual use of SM, PM, SSP, RP, and strain MN-54 significantly increased (P ≤ 0.05) the nutrient uptake, growth, yield, and protein content of chickpea as compared to control treatments. While the combined use of SM or PM, SSP or RP, and MN-54 further enhanced this effect. Among different treatments, combined use of RP, PM and MN-54 proved the most effective treatment showing increase of 37.5 and 42.6% in shoot and root lengths, 43.4 and 38.3% in fresh and dry shoot weights, 36.1 and 36.5% in fresh and dry root weights, 45.8% in no. of pods, 43.6% in nodules counts, 16.0% in 100-grain weight and 31–36% nutrient uptake over control treatments. Our findings suggest that the co-addition of organic manures and P fertilizers along with plant growth promoting bacteria (i.e., Bacillus sp. MN-54) not only increases the growth and yield but also improves nodulation, nutrient uptake, and crude proteins content in chickpea.

ACS Style

Muhammad Khan; Muhammad Afzal; Safdar Bashir; Muhammad Naveed; Sara Anum; Sardar Cheema; Abdul Wakeel; Muhammad Sanaullah; Muhammad Ali; Zhongbing Chen. Improving Nutrient Uptake, Growth, Yield and Protein Content in Chickpea by the Co-Addition of Phosphorus Fertilizers, Organic Manures, and Bacillus sp. MN-54. Agronomy 2021, 11, 436 .

AMA Style

Muhammad Khan, Muhammad Afzal, Safdar Bashir, Muhammad Naveed, Sara Anum, Sardar Cheema, Abdul Wakeel, Muhammad Sanaullah, Muhammad Ali, Zhongbing Chen. Improving Nutrient Uptake, Growth, Yield and Protein Content in Chickpea by the Co-Addition of Phosphorus Fertilizers, Organic Manures, and Bacillus sp. MN-54. Agronomy. 2021; 11 (3):436.

Chicago/Turabian Style

Muhammad Khan; Muhammad Afzal; Safdar Bashir; Muhammad Naveed; Sara Anum; Sardar Cheema; Abdul Wakeel; Muhammad Sanaullah; Muhammad Ali; Zhongbing Chen. 2021. "Improving Nutrient Uptake, Growth, Yield and Protein Content in Chickpea by the Co-Addition of Phosphorus Fertilizers, Organic Manures, and Bacillus sp. MN-54." Agronomy 11, no. 3: 436.

Journal article
Published: 19 February 2021 in Waste Management
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How the acetate and propionate accumulation impact anaerobic syntrophy during methane formation is not well understood. To investigate such effect, continuous acetate (35 g/L), propionate (11.25 g/L) and bicarbonate (30 g/L) supplementation were used during mesophilic anaerobic digestion. The high throughput sequencing (16S rRNA and mcrA), Real-Time quantitative PCR, and stable carbon isotope fingerprinting were applied to investigate the structure and activity of microbial community members. The results demonstrated that the abundance of syntrophic acetate oxidizing bacteria exhibited a gradual decrease coupled with heavier stable carbon isotopic signature of methane (δ 13CH4) in the three reagents impacted reactors. The increased acetate and propionate concentrations exerted negative influence on biogas production but the relatively stable hydrogenotrophic methanogens together with syntrophic acetate/propionate oxidizing bacteria kept the stable methane formation facing acetate and propionate accumulation. The functional genes copy number of the hydrogenotrophic Methanocellaceae and Methanomicrobiaceae correlated significantly with δ 13CH4 (R2 > 0.74), but only the abundance of Methanocellaceae fitted well with δ 13CH4 (p < 0.05). The δ 13CH4 signatures can predict methanogenesis, as it directly reflects the main methanogenic pathway; yet, further investigation of isotope fractionation in acetate/propionate coupled with δ 13CH4 is needed. Collectively, these results provide deep insight into anaerobic syntrophy and reveal changes of synergistic relationships, both of which may contribute to the stability of biogas reactors.

ACS Style

Yanan Yue; Junyu Wang; Xiayuan Wu; Jianfeng Zhang; Zhongbing Chen; Xuejing Kang; Zuopeng Lv. The fate of anaerobic syntrophy in anaerobic digestion facing propionate and acetate accumulation. Waste Management 2021, 124, 128 -135.

AMA Style

Yanan Yue, Junyu Wang, Xiayuan Wu, Jianfeng Zhang, Zhongbing Chen, Xuejing Kang, Zuopeng Lv. The fate of anaerobic syntrophy in anaerobic digestion facing propionate and acetate accumulation. Waste Management. 2021; 124 ():128-135.

Chicago/Turabian Style

Yanan Yue; Junyu Wang; Xiayuan Wu; Jianfeng Zhang; Zhongbing Chen; Xuejing Kang; Zuopeng Lv. 2021. "The fate of anaerobic syntrophy in anaerobic digestion facing propionate and acetate accumulation." Waste Management 124, no. : 128-135.

Journal article
Published: 13 February 2021 in Journal of Cleaner Production
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Although biofilm growth caused clogging is often considered detrimental to the performance of intermittent sand filters (ISF), the presence of biofilm in ISF is indispensable for wastewater treatment. In this study, the role of biofilm growth clogging in ISF performance is studied by pilot experiments and biokinetic simulation. Both the pilot experiments and the simulation demonstrate that biofilm growth is significantly enhanced in the top layers of ISF and is dominantly comprised of heterotrophs. The clogging development zone was responsible for the majority of organic carbon and NH4+−N removal. Simultaneous nitrification and denitrification (SND) also occurred in the clogging development zone. The development of clogging can also enhance the organic carbon and NH4+−N removals as well as SND. Monte Carlo analysis indicated the lifetime of an ISF is negatively related to influent strength and hydraulic loading rate (HLR), and is more sensitive to influent strength than HLR. Although biofilm clogging is impacted by wastewater strength, HLR increase can send more biological removal burdens to layers below the clogging development zone, and thus negatively impact effluent quality due to reduced hydraulic retention time (HRT) within the ISF. Conservatively managed HLRscan reduce clogging development and limit biological removal burdens within the clogging development zone due to increased HRT. This study highlights the merit of managed biofilm growth in ISF and calls for research on advanced strategies to balance the positive and negative aspects of biofilm growth clogging in ISFs.

ACS Style

Siqi Chen; Zhongbing Chen; Mark Dougherty; Xingtao Zuo; Jiajie He. The role of clogging in intermittent sand filter (ISF) performance in treating rural wastewater retention pond effluent. Journal of Cleaner Production 2021, 294, 126309 .

AMA Style

Siqi Chen, Zhongbing Chen, Mark Dougherty, Xingtao Zuo, Jiajie He. The role of clogging in intermittent sand filter (ISF) performance in treating rural wastewater retention pond effluent. Journal of Cleaner Production. 2021; 294 ():126309.

Chicago/Turabian Style

Siqi Chen; Zhongbing Chen; Mark Dougherty; Xingtao Zuo; Jiajie He. 2021. "The role of clogging in intermittent sand filter (ISF) performance in treating rural wastewater retention pond effluent." Journal of Cleaner Production 294, no. : 126309.

Journal article
Published: 05 February 2021 in Environmental Research
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Sludge drying bed (SDB) treatment is a valuable alternative to conventional sludge treatment methods. However, changes in sludge hydrotexture during dewatering present a barrier for direct modeling of the SDB process. This study proposes a modeling strategy to simulate the sludge stabilization process in SDB treatment by separating sludge dewatering and sludge solids stabilization into independent processes. Two cell decay theories widely used by activated sludge models (ASM), death-regeneration concept and endogenous respiration theory, are compared to describe the biokinetic processes of sludge digestion. Both cell decay theories are found to adequately describe effluent total COD, NH4–N, NO3–N, and sludge layer composition, but have pronounced differences in describing effluent COD compositions. Results show that natural aeration does not maintain adequate aerobic/anoxic sludge digestion within the sludge layer to fully nitrify NH4–N released by cell decay. Results also indicate that the kinetics of sludge digestion are adaptable over time, indicating the need to adopt lumped values for biokinetic simulations. While lowered sludge dewatering rates (outflow) can increase biodegradable COD for cell metabolism, increased sludge loading rates (inflow) lead to higher effluent COD and NH4–N concentrations. Contrary to conventional judgement, this study demonstrates the merit of sludge layer formation to reduce leaching loss of biodegradable COD. Overall, the proposed modeling strategy is proven capable of simulating deposited sludge digestion processes in an SDB.

ACS Style

Jiajie He; Zhongbing Chen; Mark Dougherty; Shanshan Hu; Xingtao Zuo. Explore the sludge stabilization process in sludge drying bed by modeling study from mesocosm experiments. Environmental Research 2021, 195, 110837 .

AMA Style

Jiajie He, Zhongbing Chen, Mark Dougherty, Shanshan Hu, Xingtao Zuo. Explore the sludge stabilization process in sludge drying bed by modeling study from mesocosm experiments. Environmental Research. 2021; 195 ():110837.

Chicago/Turabian Style

Jiajie He; Zhongbing Chen; Mark Dougherty; Shanshan Hu; Xingtao Zuo. 2021. "Explore the sludge stabilization process in sludge drying bed by modeling study from mesocosm experiments." Environmental Research 195, no. : 110837.

Journal article
Published: 07 January 2021 in Journal of Hazardous Materials
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A novel CeO2 doped high silica ZSM-5([email protected]) composite was originally fabricated via ammonia precipitation for the catalytic ozonation of sulfamethoxazole (SMX). Physicochemical properties have been investigated through electron microscope, Raman spectroscopy, X-ray photoelectron spectroscopy, etc. The prepared nanometer [email protected] had a much higher specific surface (348–395 m2/g), a finer crystallite size (8.2–33.5 nm) and superior stability. Temperature-programmed desorption and reduction analysis revealed that the formed CeO2 nanoparticles on the surface of [email protected] could improve the reducibility of surface-capping oxygen, induce more oxygen vacancies and promote oxygen migration. [email protected] exhibited excellent catalytic performance for SMX mineralization in the pH range of environmental waters. The great enhancement of [email protected] catalytic activity was ascribed to the conversion of O3 into active oxygen involved in SMX mineralization, including .OH, O2.– and 1O2. This work provides a reference for the removal of pollutants by zeolite supported Ce catalytic ozonation process in water.

ACS Style

Xingtao Zuo; Senlin Ma; Qiyuan Wu; Juan Xiong; Jiajie He; Cong Ma; Zhongbing Chen. Nanometer CeO2 doped high silica ZSM-5 heterogeneous catalytic ozonation of sulfamethoxazole in water. Journal of Hazardous Materials 2021, 411, 125072 .

AMA Style

Xingtao Zuo, Senlin Ma, Qiyuan Wu, Juan Xiong, Jiajie He, Cong Ma, Zhongbing Chen. Nanometer CeO2 doped high silica ZSM-5 heterogeneous catalytic ozonation of sulfamethoxazole in water. Journal of Hazardous Materials. 2021; 411 ():125072.

Chicago/Turabian Style

Xingtao Zuo; Senlin Ma; Qiyuan Wu; Juan Xiong; Jiajie He; Cong Ma; Zhongbing Chen. 2021. "Nanometer CeO2 doped high silica ZSM-5 heterogeneous catalytic ozonation of sulfamethoxazole in water." Journal of Hazardous Materials 411, no. : 125072.

Journal article
Published: 28 November 2020 in Atmospheric Pollution Research
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The COVID-19 virus outbreak has been declared a “global pandemic”. Therefore, “lockdown” was issued in affected countries to control the spread of the virus. To assess air pollution during and after lockdowns, this study selected pandemic hotspots in China (Wuhan), Japan (Tokyo), the Republic of Korea (Daegu), and India (Mumbai) and compared the Air Quality Index (AQI) in these areas for the past three years. The results indicated that air pollution levels were positively correlated with a reduction in pollutant levels during and after lockdowns in these cities. In Tokyo, low levels of air pollution, no significant change in the distribution of “good” and “moderate” days was observed during lockdown. In Daegu, mid-level air pollution, the percentage of “unhealthy” days (AQI>100) markedly reduced during lockdown; however, this reverted after lockdown was lifted. In Wuhan and Mumbai, high air pollution levels, the percentage of unhealthy days remarkably decreased during lockdown and continued to reduce after lockdown. It was found that PM2.5 was the critical pollutant for all cities because its sub-AQI was the largest of the six pollutant species for the majority of days. In addition, PM10 dominated the overall AQI for 2.2–9.6% of the period in Wuhan and Mumbai, and its sub-AQI reduced during lockdown. The mean sub-AQI for NO2, SO2, CO, and O3 was within the “good” category for all cities. In conclusion, the lockdown policy reduced air pollution in general and this reduction was more significant for regions with high air pollution levels.

ACS Style

Meng Hu; Zhongbing Chen; Haiyan Cui; Tao Wang; Chao Zhang; Keming Yun. Air pollution and critical air pollutant assessment during and after COVID-19 lockdowns: Evidence from pandemic hotspots in China, the Republic of Korea, Japan, and India. Atmospheric Pollution Research 2020, 12, 316 -329.

AMA Style

Meng Hu, Zhongbing Chen, Haiyan Cui, Tao Wang, Chao Zhang, Keming Yun. Air pollution and critical air pollutant assessment during and after COVID-19 lockdowns: Evidence from pandemic hotspots in China, the Republic of Korea, Japan, and India. Atmospheric Pollution Research. 2020; 12 (2):316-329.

Chicago/Turabian Style

Meng Hu; Zhongbing Chen; Haiyan Cui; Tao Wang; Chao Zhang; Keming Yun. 2020. "Air pollution and critical air pollutant assessment during and after COVID-19 lockdowns: Evidence from pandemic hotspots in China, the Republic of Korea, Japan, and India." Atmospheric Pollution Research 12, no. 2: 316-329.

Journal article
Published: 12 November 2020 in Environmental Research
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Sludge drying reed beds (SDRBs), as a natural biological technology, have positive effects on surplus sludge treatment. However, few studies focus on the sludge leachate purification in the SDRBs regarding the wetland plant species and sludge loading rates. In this study, four SDRBs planted with two wetland plant species (Phragmites australis, Typha angustifolia) were investigated for leachate purification under six sludge loading volumes and feeding frequencies (9L/3d, 6L/3d, 4L/d, 3L/d, 2.5L/d, and 2L/d). Results showed that the lowest Escherichia coli content of 630 number/mL was determined in the P. australis SDRBs, with 86.2–92.8% lower than those in the T. angustifolia controls. However, similar removal efficiencies of chemical oxygen demand (COD), total nitrogen (TN), ammonium (NH4+), total phosphorus (TP), and heavy metals were obtained in the SDRBs with both plant species. Moreover, the optimum sludge loading volume and feeding frequency of 3L/d was determined in the P. australis system, with pollutants (COD, TN, NH4+, and TP) mass removal efficiencies in the leachate being over 94.9%. In addition, the principal component analysis indicated that water loss and oxidation-reduction potential had positive influences on pollutant removal in the planted SDRBs. Overall, the best leachate removal efficiency was obtained in the P. australis SDRBs under the sludge loading volume and feeding frequency of 3L/d.

ACS Style

Shanshan Hu; Huilun Chen; Zhongbing Chen. Performance of sludge drying reed beds for the leachate purification: Effects of sludge loading frequencies and plant species. Environmental Research 2020, 194, 110452 .

AMA Style

Shanshan Hu, Huilun Chen, Zhongbing Chen. Performance of sludge drying reed beds for the leachate purification: Effects of sludge loading frequencies and plant species. Environmental Research. 2020; 194 ():110452.

Chicago/Turabian Style

Shanshan Hu; Huilun Chen; Zhongbing Chen. 2020. "Performance of sludge drying reed beds for the leachate purification: Effects of sludge loading frequencies and plant species." Environmental Research 194, no. : 110452.

Journal article
Published: 10 November 2020 in Journal of Hazardous Materials
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This study investigated the effects of arbuscular mycorrhizal fungi (AMF) colonization on the growth of wetland plants (Glyceria maxima), and treatment performance in constructed wetlands (CWs) under the stress of pharmaceuticals ibuprofen (IBU) and diclofenac (DCF). Results showed that the growth of G. maxima was significantly increased by AMF colonization. AMF significantly increased the activities of antioxidant enzymes (peroxidase and superoxide dismutase) and soluble protein content in wetland plants, but the contents of malondialdehyde and O2•− were reduced. The removal efficiencies of TOC, PO43−-P, NH4+-N, and TN were increased in AMF+ treatments by 6%, 11%, 15% and 11%, respectively. AMF increased the removal efficiencies of IBU and DCF by 6–14% and 2–21%, respectively, and reduced the content of their metabolites (2-OH IBU, CA IBU and 4′-OH DCF) in the effluent. Besides, the presence of AMF increased the contents of IBU and DCF in plant roots, while decreased their transportation to shoots. AMF symbiosis decreased the contents of IBU metabolites (2-OH IBU and CA IBU) but increased the contents of DCF metabolite (4′-OH DCF) in the roots of the host plant. In conclusion, these results indicated that AMF plays a promising role in CWs for emerging pollutants removal.

ACS Style

Bo Hu; Shanshan Hu; Zhongbing Chen; Jan Vymazal. Employ of arbuscular mycorrhizal fungi for pharmaceuticals ibuprofen and diclofenac removal in mesocosm-scale constructed wetlands. Journal of Hazardous Materials 2020, 409, 124524 .

AMA Style

Bo Hu, Shanshan Hu, Zhongbing Chen, Jan Vymazal. Employ of arbuscular mycorrhizal fungi for pharmaceuticals ibuprofen and diclofenac removal in mesocosm-scale constructed wetlands. Journal of Hazardous Materials. 2020; 409 ():124524.

Chicago/Turabian Style

Bo Hu; Shanshan Hu; Zhongbing Chen; Jan Vymazal. 2020. "Employ of arbuscular mycorrhizal fungi for pharmaceuticals ibuprofen and diclofenac removal in mesocosm-scale constructed wetlands." Journal of Hazardous Materials 409, no. : 124524.

Journal article
Published: 27 October 2020 in Chemosphere
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Ionic liquids (ILs) as green solvents have been studied in the application of gas sweetening. However, it is a huge challenge to obtain all the experimental values because of the high costs and generated chemical wastes. This study pioneered a quantitative structure−property relationship (QSPR) model for estimating Henry’s law constant (HLC) of H2S in ILs. A dataset consisting of the HLC data of H2S for 22 ILs within a wide range of temperature (298.15–363.15 K) were collected from published reports. The electrostatic potential surface area (SEP) and molecular volume of these ILs were calculated and used as input descriptors together with temperature. The extreme learning machine (ELM) algorithm was employed for nonlinear modelling. Results showed that the determination coefficient (R2) of the training set, test set and total set were 0.9996, 0.9989,0.9994, respectively, while the average absolute relative deviation (AARD%) of them were 1.3383, 2,4820 and 1.5820, respectively. The statistical parameters for the measurement of the model exhibited the great reliability, stability, and predictive power of the ELM model. The Applicability Domain (AD) of the ELM model is also investigated. It proves that the majority of ILs in the training and test sets are located in the model’s AD and verifies the reliability of the model. The proposed model is potentially applicable to guide the application of ILs for gas sweetening.

ACS Style

Xuejing Kang; Zuopeng Lv; Yongsheng Zhao; Zhongbing Chen. A QSPR model for estimating Henry’s law constant of H2S in ionic liquids by ELM algorithm. Chemosphere 2020, 269, 128743 .

AMA Style

Xuejing Kang, Zuopeng Lv, Yongsheng Zhao, Zhongbing Chen. A QSPR model for estimating Henry’s law constant of H2S in ionic liquids by ELM algorithm. Chemosphere. 2020; 269 ():128743.

Chicago/Turabian Style

Xuejing Kang; Zuopeng Lv; Yongsheng Zhao; Zhongbing Chen. 2020. "A QSPR model for estimating Henry’s law constant of H2S in ionic liquids by ELM algorithm." Chemosphere 269, no. : 128743.

Review
Published: 04 October 2020 in Science of The Total Environment
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In recent years, magnetic biochar (MBC) has been greatly concerned because of its magnetic separation characteristics, and has been successfully used as a catalyst in the catalytic degradation of organic pollutants. However, there is currently a lack of a more systematic summary of MBC preparation methods, and no detailed overview of the catalytic mechanism of MBC catalysts for the degradation of organic pollutants. Therefore, we carry out this work to fill the above gaps. At first, we summarize the raw materials, preparation methods, and types of MBC in detail, and emphasize the MBC prepared by iron-containing sludge. Then, the catalytic mechanisms of MBC in peroxydisulfate, peroxymonosulfate, Fenton-like, photocatalysis, and NaBH4 systems are carefully summarized, highlighting the contribution of various parts of MBC in catalysis. The degradation efficiency of organic pollutants in the above systems is evaluated. Finally, the stability and reusability of MBC catalysts are evaluated. In conclusion, this review contributes a meager force to the future development of MBC.

ACS Style

Zhuqing Feng; Rongfang Yuan; Fei Wang; Zhongbing Chen; Beihai Zhou; Huilun Chen. Preparation of magnetic biochar and its application in catalytic degradation of organic pollutants: A review. Science of The Total Environment 2020, 765, 142673 .

AMA Style

Zhuqing Feng, Rongfang Yuan, Fei Wang, Zhongbing Chen, Beihai Zhou, Huilun Chen. Preparation of magnetic biochar and its application in catalytic degradation of organic pollutants: A review. Science of The Total Environment. 2020; 765 ():142673.

Chicago/Turabian Style

Zhuqing Feng; Rongfang Yuan; Fei Wang; Zhongbing Chen; Beihai Zhou; Huilun Chen. 2020. "Preparation of magnetic biochar and its application in catalytic degradation of organic pollutants: A review." Science of The Total Environment 765, no. : 142673.

Journal article
Published: 26 September 2020 in Science of The Total Environment
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The sustainability of rural sanitation includes the long-term welfare of both rural and urban societies. As a commonly used rural sanitation technology, operation of intermittent sand filters (ISF) is impacted by biofilm clogging inside the ISF. In this study ISF performance is studied at low hydraulic loading rates (HLR) to explore the interaction between biofilm growth and wastewater treatment efficiency. CW2D/HYDRUS, a simulation model which does not include media hydraulic property changes caused by biofilm growth, is utilized as a numerical control to contrast the effects of biofilm growth inside an experimental ISF. A paired experiment with simulation demonstrate that biofilm clogging comprised dominantly of heterotrophs occurred in the top layers of the ISF. Lowered HLR slows clogging development but not final clogging extent. The biofilm clogging development zone offers adequate removal of applied biodegradable COD and NH4+ − N. However, the spatial distribution of heterotrophs and biodegradable COD does not match the denitrification requirement of the resulting NO3− − N. A simultaneous nitrification and denitrification (SND) potential is manifested in the clogging development zone, but lowered HLR reduces media moisture level to a less favorable level for denitrification. Furthermore, slowed water movement under lower HLR aggravates the accumulation of NO3− − N, which can potentially result in counterproductive salt accumulation. Since biofilm growth is a natural and self-adaptive response to wastewater application, this study suggests accepting limited, managed biofilm growth and clogging in ISFs. In addition, this study calls for further research to manage biofilm growth and clogging for long-term ISF sustainability.

ACS Style

Siqi Chen; Mark Dougherty; Zhongbing Chen; Xingtao Zuo; Jiajie He. Managing biofilm growth and clogging to promote sustainability in an intermittent sand filter (ISF). Science of The Total Environment 2020, 755, 142477 -142477.

AMA Style

Siqi Chen, Mark Dougherty, Zhongbing Chen, Xingtao Zuo, Jiajie He. Managing biofilm growth and clogging to promote sustainability in an intermittent sand filter (ISF). Science of The Total Environment. 2020; 755 ():142477-142477.

Chicago/Turabian Style

Siqi Chen; Mark Dougherty; Zhongbing Chen; Xingtao Zuo; Jiajie He. 2020. "Managing biofilm growth and clogging to promote sustainability in an intermittent sand filter (ISF)." Science of The Total Environment 755, no. : 142477-142477.

Journal article
Published: 25 September 2020 in Scientific Reports
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The residual antibiotics in the environment have lately caused widespread concerns. However, little information is available on the antibiotic bioaccumulation and its health risk in drinking water resources of South China. Therefore, the occurrence, distribution, and health risk of four quinolone antibiotics including ofloxacin (OFX), norfloxacin (NOR), ciprofloxacin (CIP), and enrofloxacin (ENR) in the Qingshitan reservoir using high-performance liquid chromatography were investigated. Results revealed that the concentrations in water, sediment, and edible fish ranged from 3.49–660.13 ng/L, 1.03–722.18 μg/kg, and 6.73–968.66 μg/kg, respectively. The ecological risk assessment via the risk quotient (RQ) method showed that the values in sediment were all greater than 1, posing a high risk to the environment. The health risk index of water samples was at the maximum acceptable level, with OFX at the top while the rest were at the medium risk level. The main edible fish kinds of the reservoir had high dietary safety and the highest contaminations were found in carnivorous feeding habits and demersal habitat fishes with OFX as the highest magnitude. Source identification and correlation analysis using SPSS showed significant relationships between NOR with pH and turbidity (in water), as well as total phosphor (TP) and total organic carbon (TOC) in sediment. NOR was the highest in sediment which mostly sourced from livestock wastewater, croplands irrigation drain water, and stormwater. Correlations between CIP and ENR with TP were significant, while OFX was positively associated with total nitrogen (TN) which mainly originated from urban sewage as well as directly dosed drugs in fish farms. In conclusion, our results are of great significance for ensuring the safety of drinking water and aquatic products in this region.

ACS Style

Liangliang Huang; Yuanmin Mo; Zhiqiang Wu; Saeed Rad; Xiaohong Song; Honghu Zeng; Safdar Bashir; Bin Kang; Zhongbing Chen. Occurrence, distribution, and health risk assessment of quinolone antibiotics in water, sediment, and fish species of Qingshitan reservoir, South China. Scientific Reports 2020, 10, 1 -18.

AMA Style

Liangliang Huang, Yuanmin Mo, Zhiqiang Wu, Saeed Rad, Xiaohong Song, Honghu Zeng, Safdar Bashir, Bin Kang, Zhongbing Chen. Occurrence, distribution, and health risk assessment of quinolone antibiotics in water, sediment, and fish species of Qingshitan reservoir, South China. Scientific Reports. 2020; 10 (1):1-18.

Chicago/Turabian Style

Liangliang Huang; Yuanmin Mo; Zhiqiang Wu; Saeed Rad; Xiaohong Song; Honghu Zeng; Safdar Bashir; Bin Kang; Zhongbing Chen. 2020. "Occurrence, distribution, and health risk assessment of quinolone antibiotics in water, sediment, and fish species of Qingshitan reservoir, South China." Scientific Reports 10, no. 1: 1-18.

Journal article
Published: 17 September 2020 in Journal of Water Process Engineering
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Bioelectricity can be produced from wastewater using microbial fuel cells (MFCs) that produce electricity during electrochemical and biochemical reactions, yet actual applications of wastewater MFCs are limited; a self-provided microbial electricity enhanced wastewater treatment method is proposed producing microbial power and enhanced pollutants removal simultaneously. A carbon felt coated with amino-functionalized Fe3O4 particles was synthesized; power generation, removal of chemical oxygen demand (COD) and NH4+-N were evaluated with cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), cell voltage and treatment efficiency. Results showed that the amino-Fe3O4 coated anode led to higher NH4+-N removal efficiency of 97.7 % than the Fe3O4 coated anode of 48.9 %. Moreover, the maximum power density of the amino-Fe3O4 anode is 208.67 mW/m2, 35.1 % higher than that of the Fe3O4 anode. This finding was explained by the presence of protonated amino groups NH4+ that favored the attachment of negatively charged bacteria. Amino-functionalization of the anode promotes a promising, novel technology to treat wastewater while producing electricity.

ACS Style

Hongbo Liu; Yi Zhang; Yanhong Zhou; Zhongbing Chen; Eric Lichtfouse. Self-provided microbial electricity enhanced wastewater treatment using carbon felt anode coated with amino-functionalized Fe3O4. Journal of Water Process Engineering 2020, 38, 101649 .

AMA Style

Hongbo Liu, Yi Zhang, Yanhong Zhou, Zhongbing Chen, Eric Lichtfouse. Self-provided microbial electricity enhanced wastewater treatment using carbon felt anode coated with amino-functionalized Fe3O4. Journal of Water Process Engineering. 2020; 38 ():101649.

Chicago/Turabian Style

Hongbo Liu; Yi Zhang; Yanhong Zhou; Zhongbing Chen; Eric Lichtfouse. 2020. "Self-provided microbial electricity enhanced wastewater treatment using carbon felt anode coated with amino-functionalized Fe3O4." Journal of Water Process Engineering 38, no. : 101649.

Journal article
Published: 16 September 2020 in Environmental Research
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Arbuscular mycorrhizal fungi (AMF) provide a positive effect on antioxidant mechanisms in terrestrial plants under heavy metal stress. This study investigated the effects of AMF on wetland plant (Iris wilsonii) growth and antioxidant response under Cr stress at different water depths. Results showed that AMF inoculated I. wilsonii had higher antioxidant response than non-inoculated controls, with shoot superoxide dismutase (SOD), root SOD, shoot peroxidase (POD), and root POD contents increased by 4.7-39.6%, 7.5-29.5%, 11.2-68.6%, 16.8-50.3%, respectively. Meanwhile, shoot (root) proline, malondialdehyde (MDA) and superoxide anion (O2.-) contents in the AMF inoculated I. wilsonii were 10.2-44.3% (2.8-37.2%), 11.5-35.4% (16.9-28.2), and 14.9-30.5% (-0.9-26.3%) lower than those in the non-inoculated controls, respectively. Besides, AMF improved the growth of I. wilsonii with biomass, height, chlorophyll, K, and P contents in the shoots increased by 10.5-32.5%, 17.4-44.9%, 4.7-37.7%, 12.0-30.7%, 13.5-20.6%, respectively. Moreover, the I. wilsonii tolerance to Cr stress was also enhanced under the water depth of 6-3 cm. Therefore, AMF play an important role in wetland plant growth and antioxidant response under Cr stress, and it can improve wetland plants’ tolerance to Cr stress at fluctuating water depth.

ACS Style

Shanshan Hu; Bo Hu; Zhongbing Chen; Miroslav Vosátka; Jan Vymazal. Antioxidant response in arbuscular mycorrhizal fungi inoculated wetland plant under Cr stress. Environmental Research 2020, 191, 110203 .

AMA Style

Shanshan Hu, Bo Hu, Zhongbing Chen, Miroslav Vosátka, Jan Vymazal. Antioxidant response in arbuscular mycorrhizal fungi inoculated wetland plant under Cr stress. Environmental Research. 2020; 191 ():110203.

Chicago/Turabian Style

Shanshan Hu; Bo Hu; Zhongbing Chen; Miroslav Vosátka; Jan Vymazal. 2020. "Antioxidant response in arbuscular mycorrhizal fungi inoculated wetland plant under Cr stress." Environmental Research 191, no. : 110203.

Journal article
Published: 02 September 2020 in Chemosphere
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To promote the environmental sustainability of rural sanitation, a soil moisture controlled wastewater subsurface drip irrigation (SDI) dispersal system was field tested in the Black Belt Prairie of Alabama, USA. The soil moisture control strategy was designed to regulate wastewater disposal timing according to drain field conditions to prevent hydraulic overloading and corresponding environmental hazard. CW2D/HYDRUS simulation modeling was utilized to explore difficult-to-measure aspects of system performance. While the control system successfully adapted hydraulic loading rate to changing drain field conditions, saturated field conditions during the dormant season presented practical application challenges. The paired field experiment and simulation model demonstrate that soil biofilm growth was stimulated in the vicinity of drip emitters. Although biofilm growth is critical in maintaining adequate COD and NH4+−N removal efficiencies, the efficient removal of biodegradable COD itself by soil biofilm limits denitrification of formed NO3−−N . Furthermore, stimulated soil biofilm growth can create soil clogging around drip emitters, which was discerned in the field experiment along with salt accumulation, both of which were verified by simulation. Comparable modeling of system performance in sand and clay media demonstrate that the placement of soil moisture sensors within the drain field can have pronounced impacts on system hydraulic performance, depending on the soil permeability. Overall, the soil moisture control strategy tested is shown as a viable supplemental technology to promote the environmental sustainability of rural sanitation systems.

ACS Style

Jiajie He; Mark Dougherty; Zhongbing Chen. Numerical assessment of a soil moisture controlled wastewater SDI disposal system in Alabama Black Belt Prairie. Chemosphere 2020, 263, 128210 -128210.

AMA Style

Jiajie He, Mark Dougherty, Zhongbing Chen. Numerical assessment of a soil moisture controlled wastewater SDI disposal system in Alabama Black Belt Prairie. Chemosphere. 2020; 263 ():128210-128210.

Chicago/Turabian Style

Jiajie He; Mark Dougherty; Zhongbing Chen. 2020. "Numerical assessment of a soil moisture controlled wastewater SDI disposal system in Alabama Black Belt Prairie." Chemosphere 263, no. : 128210-128210.

Journal article
Published: 16 August 2020 in Science of The Total Environment
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Stable isotopes are increasingly used to detect and understand the impacts of environmental changes on riverine ecological properties. δ13C and δ15N signatures of fish with different feeding habits were measured in a large subtropical river to evaluate how fish isotopic niches respond to environmental gradients and human disturbance. From basal resources to fish assemblages, the high values of epilithic periphyton (biofilm) δ13C and suspended particulate organic matter δ15N concurrently determined the ranges and areas (e.g., convex hull) of niche metrics. Along a longitudinal gradient (except in the industrial zone), the number of fish trophic guilds identified by Bayesian ellipses continuously increased; meanwhile, higher trophic diversity and less redundancy were observed near the lower reaches and estuary. Variance inflation factors were estimated to detect the multicollinearity of 40 environmental variables, 14 of which were selected as indicators. Relative importance (RI) analysis was used to evaluate the explanatory power of these indicators for the variation in isotopic niches; the results showed that riffle habitat area, water nitrate concentration, gravel-cobble substrate, and riparian buffer width were the 4 key indicators (average RI > 12%) that determined the fish isotopic niches. These findings suggested that community-level δ13C signatures are more responsive to changes in habitats (e.g., riffle) supporting the productivity of autochthonous diatoms while δ15N signatures respond to water quality altered by nitrogen pollution from manure-fertilized farming and poultry livestock effluent. Furthermore, δ15N may be more robust and interpretable than δ13C as an indicator of ecosystem change in rivers exposed to multiple or complex anthropogenic stressors.

ACS Style

Sai Wang; Bang-Ke Luo; Ying-Jun Qin; Jian-Gang Zhao; Tuan-Tuan Wang; Simon D. Stewart; Yang Yang; Zhong-Bing Chen; Hong-Xin Qiu. Fish isotopic niches associated with environmental indicators and human disturbance along a disturbed large subtropical river in China. Science of The Total Environment 2020, 750, 141667 .

AMA Style

Sai Wang, Bang-Ke Luo, Ying-Jun Qin, Jian-Gang Zhao, Tuan-Tuan Wang, Simon D. Stewart, Yang Yang, Zhong-Bing Chen, Hong-Xin Qiu. Fish isotopic niches associated with environmental indicators and human disturbance along a disturbed large subtropical river in China. Science of The Total Environment. 2020; 750 ():141667.

Chicago/Turabian Style

Sai Wang; Bang-Ke Luo; Ying-Jun Qin; Jian-Gang Zhao; Tuan-Tuan Wang; Simon D. Stewart; Yang Yang; Zhong-Bing Chen; Hong-Xin Qiu. 2020. "Fish isotopic niches associated with environmental indicators and human disturbance along a disturbed large subtropical river in China." Science of The Total Environment 750, no. : 141667.

Journal article
Published: 17 July 2020 in Sustainability
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Weed–crop competition and reduced soil fertility are some of the main reasons for decreased crop yields in Pakistan. Allelopathy can be applied to combat the problems of environmental degradation by reducing pesticide use and through reduction of herbicide-resistant weeds. A two-year field experiment (2014–2015) was conducted to assess the impact of incorporation of various levels of brassica residues and brassica water extract on the growth of mung bean and soil attributes. Two brassica water extract levels (10, 20 L/ha) and two residue levels (4, 6 t/ha) were tested, and a treatment with no water extract and residue incorporation was used as the control. The results showed that the water extract and residue incorporation had diverse impacts on soil fertility indices and weed dynamics, where treatment with 6 t/ha had more significant impacts. Compared with the control, reductions of 61% in dry weight of weeds and 52% in weed density were observed. After cropping, improved soil properties in terms of available potassium, available phosphorus, soil organic matter, and total nitrogen were higher in the rhizosphere (0–15 cm) soil after the treatments of residue incorporation, i.e., 59–91%, 62–84%, 29–45%, and 52–65% higher than the control, respectively. Meanwhile, alkaline phosphatase and dehydrogenase concentrations in the rhizosphere soil were 26–41% and 52–74% higher than with the control, respectively. The highest economic return with a high benefit–cost ratio was recorded with residue incorporation. In conclusion, addition of crop residues at 6 t/ha was the most effective and economical treatment with the highest net benefit rate of returns. This approach can provide a potential alternative for implementing sustainable weed control in mung bean with significant improvement in soil properties and can be a part of sustainable and eco-friendly agriculture.

ACS Style

Raza Ullah; Zubair Aslam; Mansoor Maitah; Qamar Zaman; Safdar Bashir; Waseem Hassan; Zhongbing Chen. Sustainable Weed Control and Enhancing Nutrient Use Efficiency in Crops through Brassica (Brassica compestris L.) Allelopathy. Sustainability 2020, 12, 5763 .

AMA Style

Raza Ullah, Zubair Aslam, Mansoor Maitah, Qamar Zaman, Safdar Bashir, Waseem Hassan, Zhongbing Chen. Sustainable Weed Control and Enhancing Nutrient Use Efficiency in Crops through Brassica (Brassica compestris L.) Allelopathy. Sustainability. 2020; 12 (14):5763.

Chicago/Turabian Style

Raza Ullah; Zubair Aslam; Mansoor Maitah; Qamar Zaman; Safdar Bashir; Waseem Hassan; Zhongbing Chen. 2020. "Sustainable Weed Control and Enhancing Nutrient Use Efficiency in Crops through Brassica (Brassica compestris L.) Allelopathy." Sustainability 12, no. 14: 5763.