This page has only limited features, please log in for full access.

Unclaimed
Shubiao Wu
Department of Agroecology, Aarhus University, Blichers Alle 20, 8830 Tjele, Denmark

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 28 October 2020 in Bioresource Technology
Reads 0
Downloads 0

Information on the dynamic evolution of humic acid (HA) from anaerobic digestate and the potential of HA serving as an effective agent for remedying heavy metals is rather scarce. This study monitored the evolution of the structure and functional groups and metal-binding abilities of HA during chicken manure and corn stover anaerobic digestion (AD) processes. Higher increases in aromatic (41–66%) and oxygen-containing functional groups (37–45%) were observed in HA from the AD of corn stover, resulting in higher metal-binding abilities for Cu(II), Co(II), and Ni(II) than those of chicken manure AD. Moreover, HA extracted from fast (before day 12 for chicken manure and day 16 for corn stover), and slow (day 40) methane production stages performed different complexation capacities for the heavy metals. These results reveal the mechanisms of HA and heavy metal interactions, and confirm the potential of HA extracted from AD process for the remediation of heavy metals.

ACS Style

Xiqing Wang; Tao Lyu; Renjie Dong; Hongtao Liu; Shubiao Wu. Dynamic evolution of humic acids during anaerobic digestion: Exploring an effective auxiliary agent for heavy metal remediation. Bioresource Technology 2020, 320, 124331 .

AMA Style

Xiqing Wang, Tao Lyu, Renjie Dong, Hongtao Liu, Shubiao Wu. Dynamic evolution of humic acids during anaerobic digestion: Exploring an effective auxiliary agent for heavy metal remediation. Bioresource Technology. 2020; 320 ():124331.

Chicago/Turabian Style

Xiqing Wang; Tao Lyu; Renjie Dong; Hongtao Liu; Shubiao Wu. 2020. "Dynamic evolution of humic acids during anaerobic digestion: Exploring an effective auxiliary agent for heavy metal remediation." Bioresource Technology 320, no. : 124331.

Journal article
Published: 14 October 2020 in Chemical Engineering Journal
Reads 0
Downloads 0

Humic acid (HA), a byproduct formed during the biological conversion of organic matter into biogas in the anaerobic digestion (AD) process, contains complex structures and redox functions. However, the evolution mechanism of HA and its interaction with CH4 production during the AD process have not been fully explored, particularly with respect to various substrates and temperature conditions. In this study, we investigated the evolutionary dynamics of the structure and function of genuine HA that naturally formed in the AD processes of chicken manure and corn stover under mesophilic (37 °C) and thermophilic (55 °C) conditions. The results demonstrated that the HA evolution mechanisms in AD of chicken manure and corn stover have different pathways. The AD of core stover showed higher degree of aromaticity (41.2-66.7% and 45.3-68.4% for mesophilic and thermophilic respectively) and humification index (1.5-4.2 and 2.8-4.5 for mesophilic and thermophilic respectively) than those (28.3-45.3% and 30.2-54.5% of aromaticity and 0.6-1.2 and 1.3-3.7 of humification index) in AD of chicken manure. The results from HSQC NMR spectroscopy and 2D-COS-FTIR spectroscopy demonstrated an accelerating effect of the higher temperature on the evolution of HA through humification. Moreover, the concurrent decomposition and re-polymerization of HA during both AD processes, resulting in positive and negative effects on CH4 production in the fast and slow CH4 production stages, respectively. The dynamic interaction was due to variations in the electron transferring ability and structure of the formed HA. The results could not only advance our understanding of the mechanisms of HA evolution and its interaction with the performance of AD process, but also support further research toward improving AD performance by regulating HA formation and transformation.

ACS Style

Xiqing Wang; Atif Muhmood; Tao Lyu; Renjie Dong; Hongtao Liu; Shubiao Wu. Mechanisms of genuine humic acid evolution and its dynamic interaction with methane production in anaerobic digestion processes. Chemical Engineering Journal 2020, 408, 127322 .

AMA Style

Xiqing Wang, Atif Muhmood, Tao Lyu, Renjie Dong, Hongtao Liu, Shubiao Wu. Mechanisms of genuine humic acid evolution and its dynamic interaction with methane production in anaerobic digestion processes. Chemical Engineering Journal. 2020; 408 ():127322.

Chicago/Turabian Style

Xiqing Wang; Atif Muhmood; Tao Lyu; Renjie Dong; Hongtao Liu; Shubiao Wu. 2020. "Mechanisms of genuine humic acid evolution and its dynamic interaction with methane production in anaerobic digestion processes." Chemical Engineering Journal 408, no. : 127322.

Journal article
Published: 22 August 2020 in Science of The Total Environment
Reads 0
Downloads 0

The high content of organic substances in strength agro-industrial wastewater has been documented to be among the major barriers hampering nutrient recovery efficiency of struvite precipitation. However, our results in this study show that the previously reported negative impacts of organic substances in high-strength agricultural wastewater on struvite precipitation might be overestimated. This study is the first to test the influence of three forms of organic substances from real high-strength wastewater that contains a complex of particulate, colloidal and soluble organic substances, on nutrient recovery efficiency and product quality through struvite precipitation at varying pH conditions. Our results demonstrated that the inhibition of organic substances on struvite formation only happens at the pH levels of <9.0 with recovery reduction of PO₄3− (5–15%) and NH₄+ (6–13%). The inhibitory effect of the organic substances at the optimal pH range (9.5–10) reported from the literature review is only ≤5%. Moreover, the transformation in the contents of humic- and protein-like substances with an increment in pH was characterized and may contribute to mitigate the inhibition of nutrient recovery. Even though the particulate and colloidal organic substances slowed the precipitation reaction, they substantially increased the particle size (i.e., 70% and 40%, respectively) of the formed struvite. The presence of organic substances in all tested forms does not significantly influence the purity and crystalline structure of struvite which can still be used as a slow-releasing fertilizer. Regarding the relocation process of organic substances during struvite precipitation under varying pH conditions, understanding the interaction between organics and heavy metals which in turn affect the dynamics of heavy metals in solution and precipitates remains limited; thus, additional research is needed.

ACS Style

Atif Muhmood; Xiqing Wang; Renjie Dong; Shubiao Wu. New insights into interactions of organic substances in poultry slurry with struvite formation: An overestimated concern? Science of The Total Environment 2020, 751, 141789 .

AMA Style

Atif Muhmood, Xiqing Wang, Renjie Dong, Shubiao Wu. New insights into interactions of organic substances in poultry slurry with struvite formation: An overestimated concern? Science of The Total Environment. 2020; 751 ():141789.

Chicago/Turabian Style

Atif Muhmood; Xiqing Wang; Renjie Dong; Shubiao Wu. 2020. "New insights into interactions of organic substances in poultry slurry with struvite formation: An overestimated concern?" Science of The Total Environment 751, no. : 141789.

Journal article
Published: 09 June 2020 in Journal of Environmental Management
Reads 0
Downloads 0

Using agricultural biomasses as solid carbon substrates in constructed wetlands (CWs) could be an effective way to achieve sustainable nitrogen removal for carbon-limited wastewater treatments. This study investigated the response of bacteria community in CWs to the addition of agricultural biomasses (wheat straw, walnut shell and apricot pit). Results indicated that the addition of different agricultural biomasses had distinct influence on bacterial communities in CWs. Both wheat straw and walnut shell increased the diversity of microbial communities and optimized the structure of microorganisms. The effect of apricot pit on the richness and evenness of microbial communities was not significant, but the composition of microorganisms was significantly affected at the phylum level, especially the relative abundance of phylum Saccharibacteria. Moreover, the addition of agricultural biomasses in CWs acclimatized more functional bacteria including nitrifier and denitrifier, which were proved to be positively correlated with the high-rate denitrification performance. The obtained results would be beneficial to understand the underlying microbial mechanism of nitrogen removal in CWs with agricultural biomass and provide some guidance on the practical application of CWs.

ACS Style

Lixia Jia; Cong Li; Yan Zhang; Yingrun Chen; Mengqi Li; Shubiao Wu; Haiming Wu. Microbial community responses to agricultural biomass addition in aerated constructed wetlands treating low carbon wastewater. Journal of Environmental Management 2020, 270, 110912 .

AMA Style

Lixia Jia, Cong Li, Yan Zhang, Yingrun Chen, Mengqi Li, Shubiao Wu, Haiming Wu. Microbial community responses to agricultural biomass addition in aerated constructed wetlands treating low carbon wastewater. Journal of Environmental Management. 2020; 270 ():110912.

Chicago/Turabian Style

Lixia Jia; Cong Li; Yan Zhang; Yingrun Chen; Mengqi Li; Shubiao Wu; Haiming Wu. 2020. "Microbial community responses to agricultural biomass addition in aerated constructed wetlands treating low carbon wastewater." Journal of Environmental Management 270, no. : 110912.

Journal article
Published: 28 January 2020 in Journal of Cleaner Production
Reads 0
Downloads 0

The treatment of alkaline pretreatment liquor is critical for the clean production of biomass refinery industry. There is a compelling need to develop a simple technology for reuse of organic matter in the pretreatment liquor to achieve a more value-added product with high application potential in agriculture and benefit environmental sustainability. The objective of this study is to examine a strategy for synthesizing humic-like acid under H₂O₂ oxidation by using biomass pretreatment liquor as a precursor and evaluate their electron transferring capacity and metal-binding potential. The results show that 8% H₂O₂, a temperature of 40 °C, and a reaction time of 2 h yielded humic-like acid up to 2.9 g L−1. Meanwhile, the recovery of total phenols, total sugars, proteins, and amino acids in the pretreatment liquor was 82.8, 56.2, 78.1, and 64.2%, respectively. Compared to the commercial humic acid, humic-like acid has a more uniform particle size and higher C (22.5%), N (2.3%), O (33.8%), K (4.5%), and P (11.2%) contents. The hydroxyl and carboxyl group contents were 3.3 and 2.0 times higher in humic-like acid than that in humic acid, respectively. Moreover, humic-like acid has more electron transferring capacity as well as metal-binding potential than commercial humic acid, suggesting the great application potential for remediation of heavy metal polluted soils. The reported strategy of synthesizing humic-like acid from pretreatment liquor in this study would promote the process of cleaner production of biorefinery industry as well as circular economy in agriculture.

ACS Style

Xiqing Wang; Atif Muhmood; Renjie Dong; Shubiao Wu. Synthesis of humic-like acid from biomass pretreatment liquor: Quantitative appraisal of electron transferring capacity and metal-binding potential. Journal of Cleaner Production 2020, 255, 120243 .

AMA Style

Xiqing Wang, Atif Muhmood, Renjie Dong, Shubiao Wu. Synthesis of humic-like acid from biomass pretreatment liquor: Quantitative appraisal of electron transferring capacity and metal-binding potential. Journal of Cleaner Production. 2020; 255 ():120243.

Chicago/Turabian Style

Xiqing Wang; Atif Muhmood; Renjie Dong; Shubiao Wu. 2020. "Synthesis of humic-like acid from biomass pretreatment liquor: Quantitative appraisal of electron transferring capacity and metal-binding potential." Journal of Cleaner Production 255, no. : 120243.

Journal article
Published: 05 November 2019 in Water Research
Reads 0
Downloads 0

Groundwater, as the most important drinking water source in arid regions of China, has been polluted seriously by accumulated nitrate and heavy metals. An economic alternative with capacity of simultaneous mitigation of nitrate and heavy metals is urgently needed. This study explored the incorporation of iron scraps and biochar into constructed wetlands (CWs) for enhancing purification performance and investigated interactions of effective nitrate reduction and heavy metals mitigation. The results showed that nitrate reduction performance could reach 87% in iron and carbon-based (Fe–C) CWs through Fe–C micro-electrolysis process, with lower nitrous oxide (N2O) emission (4.6–11.75 μg m−2 h−1) due to the complete denitrification process. Moreover, efficient heavy metals mitigation of 75–97% total chromium (Cr) and total lead (Pb) was obtained from Fe–C systems. However, the occurrence of heavy metals (Cr and Pb) in the influent posed an adverse impact on nitrate removal with the reduction rate of 19–43%. Biochemical characteristics of wetland plants indicated that the plants also suffered from the stress which induced from heavy metals. Overall, although the addition of iron and biochar in CWs enhanced nitrate and heavy metals removal in low carbon groundwater, further investigation is still needed to reveal the complex relationships between the removal of nitrate and heavy metals in CWs.

ACS Style

Lixia Jia; Hai Liu; Qiang Kong; Ming Li; Shubiao Wu; Haiming Wu. Interactions of high-rate nitrate reduction and heavy metal mitigation in iron-carbon-based constructed wetlands for purifying contaminated groundwater. Water Research 2019, 169, 115285 .

AMA Style

Lixia Jia, Hai Liu, Qiang Kong, Ming Li, Shubiao Wu, Haiming Wu. Interactions of high-rate nitrate reduction and heavy metal mitigation in iron-carbon-based constructed wetlands for purifying contaminated groundwater. Water Research. 2019; 169 ():115285.

Chicago/Turabian Style

Lixia Jia; Hai Liu; Qiang Kong; Ming Li; Shubiao Wu; Haiming Wu. 2019. "Interactions of high-rate nitrate reduction and heavy metal mitigation in iron-carbon-based constructed wetlands for purifying contaminated groundwater." Water Research 169, no. : 115285.

Journal article
Published: 24 October 2019 in Journal of Environmental Management
Reads 0
Downloads 0

Characterization of the driving forces for effective and economical phosphate (PO43−) removal from wastewater by using magnetically modified biochar was performed in this study. The biochar produced from slow pyrolysis of local agricultural biomass (wood and rice husks) were magnetically modified by co-precipitation of Fe(II) and Fe(III) ions in their presence. The surface characteristics before and after modification and their efficacy for PO43− sorption, and desorption were compared. Results show that, even though magnetic biochar surface modification slightly decreased their surface area, PO43− adsorption to the modified biochars was almost double (25–28 mg g−1) than that to the raw biochar (12–15 mg g−1). The adsorption isotherm of raw biochars was better simulated via the Langmuir model, while that of modified biochars was better fitted to the Freundlich model. Moreover, the integrated analysis by XRD, EDX, and FTIR show that PO43− sorption to modified biochars could be attributed to the simultaneously-occurring electrostatic attraction, surface precipitation, and ligand exchange. While the electrostatic attraction was dominant in the presence of unmodified biochars. The regenerated modified biochars retained substantial PO43− adsorption capacity up to several regeneration cycles. Their high reusability potential leads to the effective and economical phosphate recovery and thus modified biochars could offer a viable strategy for PO43− removal.

ACS Style

Zeeshan Ajmal; Atif Muhmood; Renjie Dong; Shubiao Wu. Probing the efficiency of magnetically modified biomass-derived biochar for effective phosphate removal. Journal of Environmental Management 2019, 253, 109730 .

AMA Style

Zeeshan Ajmal, Atif Muhmood, Renjie Dong, Shubiao Wu. Probing the efficiency of magnetically modified biomass-derived biochar for effective phosphate removal. Journal of Environmental Management. 2019; 253 ():109730.

Chicago/Turabian Style

Zeeshan Ajmal; Atif Muhmood; Renjie Dong; Shubiao Wu. 2019. "Probing the efficiency of magnetically modified biomass-derived biochar for effective phosphate removal." Journal of Environmental Management 253, no. : 109730.

Research article
Published: 25 June 2019 in Environmental Science & Technology
Reads 0
Downloads 0

Iron is present in all types of wastewater, however besides acid mine drainage, where it is a major constituent of concern, it is usually neglected in other types of wastewaters. In all kinds of constructed wetlands iron plays important role in removal of organics, phosphorus and does have an impact on transformation of nitrogen, sulphur and metals. The biogeochemistry of iron is well understood in natural wetlands but knowledge about iron impact on microbiological and chemical transformations during wastewater treatment in constructed wetlands is very limited. So far the sparse research in this area provides limited information on observed interactions with several varying parameters across the studies, making it difficult to draw fundamental and mechanistic conclusions. A critical review of the complex biogeochemical networking of iron in CWs is therefore necessary to fill the gap in knowledge on the role of iron and its biogeochemical multi-interactions in wastewater treatment processes of CWs. This review is the first with specific focus on iron, discussing its mitigation and retention in CWs with different configurations and operational strategies, and presenting both seasonal dynamics and the potential remobilization of Fe. It also comprehensively discusses the interactions of redox-controlled iron turnover with the biogeochemical processes of other elements, e.g. carbon (C), nitrogen (N), phosphorus (P), sulphur (S), and heavy metals. The health response of wetland plants to both deficiency and toxicity of Fe in CWs designed with specific treatment targets has also been evaluated. Due to the complexity of various wastewater compositions and micro-redox gradients in the root rhizosphere in CWs, future research needs have also been identified.

ACS Style

Shubiao Wu; Jan Vymazal; Hans Brix. Critical Review: Biogeochemical Networking of Iron in Constructed Wetlands for Wastewater Treatment. Environmental Science & Technology 2019, 53, 7930 -7944.

AMA Style

Shubiao Wu, Jan Vymazal, Hans Brix. Critical Review: Biogeochemical Networking of Iron in Constructed Wetlands for Wastewater Treatment. Environmental Science & Technology. 2019; 53 (14):7930-7944.

Chicago/Turabian Style

Shubiao Wu; Jan Vymazal; Hans Brix. 2019. "Critical Review: Biogeochemical Networking of Iron in Constructed Wetlands for Wastewater Treatment." Environmental Science & Technology 53, no. 14: 7930-7944.

Journal article
Published: 10 June 2019 in Sustainability
Reads 0
Downloads 0

Recycling and value-added utilization of agricultural residues through combining technologies such as anaerobic digestion and pyrolysis could double the recoverable energy, close the nutrient recycle loop, and ensure cleaner agricultural production. This study assessed the beneficial application of biochar to soil to recycle digestate nutrients, improve soil quality, and reduce conventional chemical fertilizer. The addition of digestate-enriched biochar improved soil quality as it provided higher soil organic matter (232%–514%) and macronutrients (110%–230%) as opposed to the unenriched biochar and control treatments. Maize grown in soil amended with digestate-enriched biochar showed a significantly higher biomass yield compared to the control and non-enriched biochar treatments but was slightly lower than yields from chemical fertilizer treatments. The slightly lower yield (20%–25%) achieved from digestate-enriched biochar was attributed to slower mineralization and release of the adsorbed nutrients in the short term. However, digestate-enriched biochar could in the long term become more beneficial in sustaining soil fertility through maintaining high soil organic matter and the gradual release of micronutrients compared to conventional chemical fertilizer. Positive effects on soil micronutrients, macronutrients, organic matter, and biomass yield indicates that enriched biochar could partly replace chemical fertilizers and promote organic farming in a circular economy concept.

ACS Style

Simon Kizito; Hongzhen Luo; Jiaxin Lu; Hamidou Bah; Renjie Dong; Shubiao Wu. Role of Nutrient-Enriched Biochar as a Soil Amendment during Maize Growth: Exploring Practical Alternatives to Recycle Agricultural Residuals and to Reduce Chemical Fertilizer Demand. Sustainability 2019, 11, 3211 .

AMA Style

Simon Kizito, Hongzhen Luo, Jiaxin Lu, Hamidou Bah, Renjie Dong, Shubiao Wu. Role of Nutrient-Enriched Biochar as a Soil Amendment during Maize Growth: Exploring Practical Alternatives to Recycle Agricultural Residuals and to Reduce Chemical Fertilizer Demand. Sustainability. 2019; 11 (11):3211.

Chicago/Turabian Style

Simon Kizito; Hongzhen Luo; Jiaxin Lu; Hamidou Bah; Renjie Dong; Shubiao Wu. 2019. "Role of Nutrient-Enriched Biochar as a Soil Amendment during Maize Growth: Exploring Practical Alternatives to Recycle Agricultural Residuals and to Reduce Chemical Fertilizer Demand." Sustainability 11, no. 11: 3211.

News
Published: 05 June 2019 in Environmental Science & Technology
Reads 0
Downloads 0
ACS Style

Tao Lyu; Shubiao Wu; Robert J. G. Mortimer; Gang Pan. Nanobubble Technology in Environmental Engineering: Revolutionization Potential and Challenges. Environmental Science & Technology 2019, 53, 7175 -7176.

AMA Style

Tao Lyu, Shubiao Wu, Robert J. G. Mortimer, Gang Pan. Nanobubble Technology in Environmental Engineering: Revolutionization Potential and Challenges. Environmental Science & Technology. 2019; 53 (13):7175-7176.

Chicago/Turabian Style

Tao Lyu; Shubiao Wu; Robert J. G. Mortimer; Gang Pan. 2019. "Nanobubble Technology in Environmental Engineering: Revolutionization Potential and Challenges." Environmental Science & Technology 53, no. 13: 7175-7176.

Journal article
Published: 07 May 2019 in Waste Management
Reads 0
Downloads 0

Monitoring of anaerobic digestion process is essential for achieving efficient and stable performance, thus requiring identification of effective stability indicators. The response of two experimental, continuously stirred tank reactors under mesophilic condition (fed with pig manure) was investigated to analyze the perturbation of organic and hydraulic overloading, and low-temperature shock. The pH was stably maintained in the range of 7.2–7.7, regardless of the presence of most simulated perturbation situations. Monitoring of biogas production and composition is important to reflect the current state of biogas process, but cannot predict the imbalance in the system. Accumulation of total VFAs up to 21,718 mg/L was observed under the organic overloading condition (rapid increase of the organic loading rate of pig manure from 3 g VS/L/d to 9 g VS/L/d), but not for other perturbations. The ratio of propionate to acetate and that of intermediate alkalinity to partial alkalinity are rapidly altered in response to all perturbations, indicating their potential to function as stability indicators. However, the determination of the ratio of intermediate alkalinity to partial alkalinity can be performed by simple titration methods and be easily applied to actual projects without significant investment in advanced equipment and skilled operators.

ACS Style

Hao Sun; Ping Ni; Irini Angelidaki; Renjie Dong; Shubiao Wu. Exploring stability indicators for efficient monitoring of anaerobic digestion of pig manure under perturbations. Waste Management 2019, 91, 139 -146.

AMA Style

Hao Sun, Ping Ni, Irini Angelidaki, Renjie Dong, Shubiao Wu. Exploring stability indicators for efficient monitoring of anaerobic digestion of pig manure under perturbations. Waste Management. 2019; 91 ():139-146.

Chicago/Turabian Style

Hao Sun; Ping Ni; Irini Angelidaki; Renjie Dong; Shubiao Wu. 2019. "Exploring stability indicators for efficient monitoring of anaerobic digestion of pig manure under perturbations." Waste Management 91, no. : 139-146.

News
Published: 12 March 2019 in Environmental Science & Technology
Reads 0
Downloads 0
ACS Style

Shubiao Wu; Haiming Wu. Incorporating Biochar into Wastewater Eco-treatment Systems: Popularity, Reality, and Complexity. Environmental Science & Technology 2019, 53, 3345 -3346.

AMA Style

Shubiao Wu, Haiming Wu. Incorporating Biochar into Wastewater Eco-treatment Systems: Popularity, Reality, and Complexity. Environmental Science & Technology. 2019; 53 (7):3345-3346.

Chicago/Turabian Style

Shubiao Wu; Haiming Wu. 2019. "Incorporating Biochar into Wastewater Eco-treatment Systems: Popularity, Reality, and Complexity." Environmental Science & Technology 53, no. 7: 3345-3346.

Journal article
Published: 01 March 2019 in Bioresource Technology
Reads 0
Downloads 0

This work investigated the thermophilic (55 °C) co-digestion performance both in batch and continuous mode operation. The biochemical methane potentials of L. digitata and cattle manure were 308 ± 24 and 203 ± 33 mL CH4/g VS, respectively. The optimum co-digestion feedstock ratio was found to be 80% macroalgae: 20% manure on a volatile solids basis, which produced 290 ± 19 mL CH4/g VS under long-term and stable continuous operation at an organic loading rate of 2 g VS/L/d and hydraulic retention time of 15 days. Simulations of the batch and continuous experiments were, for the first time, carried out using an integrated anaerobic bioconversion model without structural modifications. Close fits between measured and simulated data provided mutual confirmation of experimental reliability and model robustness, and provided new perspectives for the use of the software tool.

ACS Style

Hao Sun; Adam Kovalovszki; Panagiotis Tsapekos; Merlin Alvarado-Morales; Amata Rudatis; Shubiao Wu; Renjie Dong; Panagiotis G. Kougias; Irini Angelidaki. Co-digestion of Laminaria digitata with cattle manure: A unimodel simulation study of both batch and continuous experiments. Bioresource Technology 2019, 276, 361 -368.

AMA Style

Hao Sun, Adam Kovalovszki, Panagiotis Tsapekos, Merlin Alvarado-Morales, Amata Rudatis, Shubiao Wu, Renjie Dong, Panagiotis G. Kougias, Irini Angelidaki. Co-digestion of Laminaria digitata with cattle manure: A unimodel simulation study of both batch and continuous experiments. Bioresource Technology. 2019; 276 ():361-368.

Chicago/Turabian Style

Hao Sun; Adam Kovalovszki; Panagiotis Tsapekos; Merlin Alvarado-Morales; Amata Rudatis; Shubiao Wu; Renjie Dong; Panagiotis G. Kougias; Irini Angelidaki. 2019. "Co-digestion of Laminaria digitata with cattle manure: A unimodel simulation study of both batch and continuous experiments." Bioresource Technology 276, no. : 361-368.

Journal article
Published: 26 January 2019 in Ecological Engineering
Reads 0
Downloads 0

This study investigated the role of biochar addition on promoting microbial nitrogen transformations in intermittent aerated subsurface flow constructed wetlands (SSF CWs) under various influent C/N ratios. The results showed that the wetland with biochar addition achieved relatively higher COD (89–99%), NH4+-N (97–99%) and TN (46–98%) removals. Biochar addition significantly improved TN removal, particularly under low influent C/N ratios (<7). Besides, the high adsorption characteristic of biochar attributed to the better removal performance of organics and ammonium. Moreover, the characteristics of dissolved organic matter (DOM) released from biochar was exploited by fluorescence excitation-emission spectrophotometry and parallel factor analysis (EEM-PARAFAC) combining with UV–Visible spectroscopy and results demonstrated that the adsorption-desorption of organics on biochar and DOM released from biochar were the main contributing factor for enhanced denitrification in SSF CWs.

ACS Style

Xu Zhou; Ruigang Wang; Hai Liu; Shubiao Wu; Haiming Wu. Nitrogen removal responses to biochar addition in intermittent-aerated subsurface flow constructed wetland microcosms: Enhancing role and mechanism. Ecological Engineering 2019, 128, 57 -65.

AMA Style

Xu Zhou, Ruigang Wang, Hai Liu, Shubiao Wu, Haiming Wu. Nitrogen removal responses to biochar addition in intermittent-aerated subsurface flow constructed wetland microcosms: Enhancing role and mechanism. Ecological Engineering. 2019; 128 ():57-65.

Chicago/Turabian Style

Xu Zhou; Ruigang Wang; Hai Liu; Shubiao Wu; Haiming Wu. 2019. "Nitrogen removal responses to biochar addition in intermittent-aerated subsurface flow constructed wetland microcosms: Enhancing role and mechanism." Ecological Engineering 128, no. : 57-65.

Review article
Published: 15 January 2019 in Science of The Total Environment
Reads 0
Downloads 0

Aerobic composting is a typical biochemical process of stabilization and harmlessness of organic wastes during which organic matter degrades, and then aggregates, to produce humic substances (HSs). HSs are a core product of—and a crucial indicator of—the maturation of compost that can be used in soil amendments. The formation of HSs is affected by the characteristics of the raw materials involved, the presence of compost additives, microbial activity, temperature, pH, the C/N ratio, moisture content, oxygen content and particle size, all of which can interact with each other. The formation of HSs is therefore complex. Moreover, it is difficult to identify definitive structures of humic acids (HAs) and fulvic acids (FAs), which are the two major components of HSs. However, HSs represent the same functional groups and structural arrangements, which helps to predict their structures. Functional groups represented by phenol and carboxylic acid groups of HAs and FAs can provide various agronomic functions, such as plant growth enhancement, water and nutrient retention, and disease suppression capacity. Overall, HSs can act as a soil amendment, fertilizer, and plant growth regulator. These functions of HSs enhance the reuse potential of organic waste compost products; however, this requires scientific control of various composting parameters and appropriate application of final products.

ACS Style

Xiaoxia Guo; Hong-Tao Liu; Shu-Biao Wu. Humic substances developed during organic waste composting: Formation mechanisms, structural properties, and agronomic functions. Science of The Total Environment 2019, 662, 501 -510.

AMA Style

Xiaoxia Guo, Hong-Tao Liu, Shu-Biao Wu. Humic substances developed during organic waste composting: Formation mechanisms, structural properties, and agronomic functions. Science of The Total Environment. 2019; 662 ():501-510.

Chicago/Turabian Style

Xiaoxia Guo; Hong-Tao Liu; Shu-Biao Wu. 2019. "Humic substances developed during organic waste composting: Formation mechanisms, structural properties, and agronomic functions." Science of The Total Environment 662, no. : 501-510.

Original research article
Published: 15 January 2019 in Frontiers in Microbiology
Reads 0
Downloads 0

Acetate as the dominant fraction of volatile fatty acids (VFAs) is an important intermediate in metabolic pathways of methanogenesis, which could reflect the stability status of anaerobic digestion (AD) process. Bioelectrochemical sensors for environmental or bioprocess monitoring have become increasingly attractive in recent years. Although it was more favorable, several challenges still need to be addressed for acetate detection, including large electrode spacing, low stability, biofouling at the cathode and low detection range. In this study, an innovative biosensor on the basis of a three-chamber microbial electrochemical system was proposed to monitor the acetate during the AD process. In such a system, acetate was first transferred from sample chamber through the anion exchange membrane (AEM) to anode due to the driven force of concentration difference and then oxidized by anodic biofilm as a substrate for the current generation. With such design, the influence of waste properties fluctuation in the cathodic reaction could be avoided. The response of current density to different acetate concentrations was investigated. The selectivity, the influence of the sample temperature and the external resistance were also evaluated. The correlation (R2 > 0.99) between the current densities and acetate concentrations (up to 160 mM) was established at specific reaction time (from 2 to 5 h). Current densities after 5 h reaction were improving about 20% when the sample temperature was high (e.g., 37 and 55∘C). The detection range increased along with the decrease of external resistance. The acetate concentrations of AD effluents as determined by the biosensor where within 24.2% of the ones determined by gas chromatography. Nevertheless, the application of the biosensor for monitoring acetate in environmental samples could still be promising.

ACS Style

Hao Sun; Irini Angelidaki; Shubiao Wu; Renjie Dong; Yifeng Zhang. The Potential of Bioelectrochemical Sensor for Monitoring of Acetate During Anaerobic Digestion: Focusing on Novel Reactor Design. Frontiers in Microbiology 2019, 9, 3357 .

AMA Style

Hao Sun, Irini Angelidaki, Shubiao Wu, Renjie Dong, Yifeng Zhang. The Potential of Bioelectrochemical Sensor for Monitoring of Acetate During Anaerobic Digestion: Focusing on Novel Reactor Design. Frontiers in Microbiology. 2019; 9 ():3357.

Chicago/Turabian Style

Hao Sun; Irini Angelidaki; Shubiao Wu; Renjie Dong; Yifeng Zhang. 2019. "The Potential of Bioelectrochemical Sensor for Monitoring of Acetate During Anaerobic Digestion: Focusing on Novel Reactor Design." Frontiers in Microbiology 9, no. : 3357.

Review
Published: 11 January 2019 in Science of The Total Environment
Reads 0
Downloads 0

Concern regarding the potential negative impacts of released engineered nanoparticles (ENPs) on pollutant removal performance of wastewater treatment systems has received booming attention in recent years. However, the conclusions drawn from different studies often lead to fragmented overall knowledge, some of which are even contradictory. This scenario shows the necessity for a comprehensive review of the interactions of ENPs in wastewater treatment systems, particularly on the impacts of ENPs on microbial processes of carbon (C), nitrogen (N), and phosphorus (P) removal in water treatment systems. This review introduced the impact of 6 often reported ENPs in 5 types of treatment systems. We found that exposure to most of the investigated ENPs at low concentrations doesn't adversely influence the growth of the heterotrophic microbes, which are responsible for organic matter removal. The impacts of ENPs on various microbial nitrogen transformation processes have been investigated. Dosing of ENPs often causes acute microbial nitrogen removal inhibition at various concentrations, but does not influence long-term operation due to microbial adaption. No significant negative effects on biological phosphorus removal in different wastewater treatment processes have been reported after both short-term and long-term exposure (except copper nanoparticles). Environmentally relevant concentrations of ENPs have been reported to enhance the photosynthetic capacity of wetland plants, whereas chronic inhibition to photosynthesis was found in exposure to high concentrations of ENPs. Inhibition effects are often overestimated in pure cultivated toxicity test assays compared to testing with artificially prepared wastewater containing various ingredients or with real wastewater. Potential ligands in real wastewater can bind with ENPs and lower their dissolution. Some challenges exist regarding detection and quantification techniques of ENPs at environmental concentrations, modeling of engineered nanomaterial release on a worldwide scale, and inhibitory mechanisms to microbial transformations.

ACS Style

Shubiao Wu; Haiming Wu; Mark Button; Dennis Konnerup; Hans Brix. Impact of engineered nanoparticles on microbial transformations of carbon, nitrogen, and phosphorus in wastewater treatment processes – A review. Science of The Total Environment 2019, 660, 1144 -1154.

AMA Style

Shubiao Wu, Haiming Wu, Mark Button, Dennis Konnerup, Hans Brix. Impact of engineered nanoparticles on microbial transformations of carbon, nitrogen, and phosphorus in wastewater treatment processes – A review. Science of The Total Environment. 2019; 660 ():1144-1154.

Chicago/Turabian Style

Shubiao Wu; Haiming Wu; Mark Button; Dennis Konnerup; Hans Brix. 2019. "Impact of engineered nanoparticles on microbial transformations of carbon, nitrogen, and phosphorus in wastewater treatment processes – A review." Science of The Total Environment 660, no. : 1144-1154.

Original paper
Published: 14 December 2018 in Waste and Biomass Valorization
Reads 0
Downloads 0

Anaerobically digested slurry is well known for its use as a bio-fertilizer because of its high macro-nutrient content (e.g. N, P, K), which is essential for plant growth. The suppressive effect of slurry land application on pathogenic fungal growth due to the presence of bioactive and antimicrobial substances generated during anaerobic digestion has recently been reported. However, knowledge about the identification, characterization, and subsequent antimicrobial activity evaluation of various bioactive compounds in the anaerobically digested slurry is still insufficient. Ultrasound-assisted extraction using three solvents, ethyl acetate (EA), dichloromethane (DM), and n-butanol (NB), was employed for extraction of bioactive compounds. After extraction and characterization, antifungal activity against Fusarium oxysporum was assessed. EA was found to be a more efficient extractant with less evaporating time (4 min), irrespective of temperature. DM was found to be efficient in the extraction of O-heterocycles, while N-heterocycles were enriched in EA extracts. Furthermore, the bioactive compounds, 1,2-benzenedicarboxylic acid, butyl 2-methylpropyl ester (54.9%), and 9-octadecenamide, (Z)-(2.51%) were detected in the EA extract, while tetrahydro-2-furanmethanamine (1.32%), cyclic octatomic sulfur (1.17%), squalene (4.06%), and cholestan-3-ol (9.06%) were detected in the DM extract. The EA extract achieved approximately 84% inhibition of F. oxysporum, while only 63% inhibition was observed with the DM extract. Collectively, these findings indicate that in addition to its role as a fertilizer, digested slurry may also contribute to the control of phytopathogens upon land application because of the presence of various bioactive compounds. However, further work is needed to explore the diversity of bioactive compounds in digested manures and evaluate their antimicrobial potential.

ACS Style

Jiaxin Lu; Atif Muhmood; Hongtao Liu; Renjie Dong; Sen Pang; Shubiao Wu. Exploring Bioactive Compounds in Anaerobically Digested Slurry: Extraction, Characterization, and Assessment of Antifungal Activity. Waste and Biomass Valorization 2018, 11, 1863 -1872.

AMA Style

Jiaxin Lu, Atif Muhmood, Hongtao Liu, Renjie Dong, Sen Pang, Shubiao Wu. Exploring Bioactive Compounds in Anaerobically Digested Slurry: Extraction, Characterization, and Assessment of Antifungal Activity. Waste and Biomass Valorization. 2018; 11 (5):1863-1872.

Chicago/Turabian Style

Jiaxin Lu; Atif Muhmood; Hongtao Liu; Renjie Dong; Sen Pang; Shubiao Wu. 2018. "Exploring Bioactive Compounds in Anaerobically Digested Slurry: Extraction, Characterization, and Assessment of Antifungal Activity." Waste and Biomass Valorization 11, no. 5: 1863-1872.

Journal article
Published: 05 December 2018 in Environmental Science & Technology
Reads 0
Downloads 0
ACS Style

Lixia Jia; Enfang Gou; Hai Liu; Shaoyong Lu; Shubiao Wu; Haiming Wu. Exploring Utilization of Recycled Agricultural Biomass in Constructed Wetlands: Characterization of the Driving Force for High-Rate Nitrogen Removal. Environmental Science & Technology 2018, 53, 1258 -1268.

AMA Style

Lixia Jia, Enfang Gou, Hai Liu, Shaoyong Lu, Shubiao Wu, Haiming Wu. Exploring Utilization of Recycled Agricultural Biomass in Constructed Wetlands: Characterization of the Driving Force for High-Rate Nitrogen Removal. Environmental Science & Technology. 2018; 53 (3):1258-1268.

Chicago/Turabian Style

Lixia Jia; Enfang Gou; Hai Liu; Shaoyong Lu; Shubiao Wu; Haiming Wu. 2018. "Exploring Utilization of Recycled Agricultural Biomass in Constructed Wetlands: Characterization of the Driving Force for High-Rate Nitrogen Removal." Environmental Science & Technology 53, no. 3: 1258-1268.

Research article
Published: 03 December 2018 in Environmental Science and Pollution Research
Reads 0
Downloads 0

Biochar as a substrate has great potential to promote pollutant removal efficiency in subsurface flow constructed wetlands (SSFCWs). However, information about the effect of different influent C/N ratios on treatment efficiency in SSFCWs with biochar is still scarce. In this study, SSFCW microcosms added with and without biochar were performed to investigate comparatively nitrogen removal in response to the domestic wastewater with varying C/N ratios. The results demonstrated that nitrogen removal increased at influent C/N ratios from1 to 3, and then decreased with the rising influent C/N ratios from 3 to 15 in different SSFCWs. Much higher removal efficiencies for COD (92%), NH4+-N (50%), and TN (50%) were obtained in the biochar-added SSFCW especially at the C/N ratio of 3 when comparing to CW without biochar. The higher pollutants removal ability of biochar-added SSFCWs was mainly attributed to the stronger adsorption ability in the porous biochar. However, poor nitrification was observed at various influent C/N ratios in SSFCWs with and without biochar due to lack of enough oxygen. This study supported that the use of biochar could increase the treatment performance in SSFCWs under various influent C/N ratios.

ACS Style

Xu Zhou; Shubiao Wu; Ruigang Wang; Haiming Wu. Nitrogen removal in response to the varying C/N ratios in subsurface flow constructed wetland microcosms with biochar addition. Environmental Science and Pollution Research 2018, 26, 3382 -3391.

AMA Style

Xu Zhou, Shubiao Wu, Ruigang Wang, Haiming Wu. Nitrogen removal in response to the varying C/N ratios in subsurface flow constructed wetland microcosms with biochar addition. Environmental Science and Pollution Research. 2018; 26 (4):3382-3391.

Chicago/Turabian Style

Xu Zhou; Shubiao Wu; Ruigang Wang; Haiming Wu. 2018. "Nitrogen removal in response to the varying C/N ratios in subsurface flow constructed wetland microcosms with biochar addition." Environmental Science and Pollution Research 26, no. 4: 3382-3391.