Article
Engineering, Environmental
Aylin Ebru Yenilmez, Selin Ertul, Tulay Yilmaz, Deniz Ucar, Francesco Di Capua, Erkan Sahinkaya
Summary: In this study, the simultaneous removal of PNP and NO3- was investigated under autotrophic and heterotrophic denitrifying conditions. The results showed that autotrophic denitrification with elemental sulfur can efficiently eliminate both PNP and NO3-, even at high concentrations. ORP was identified as a possible control parameter to modulate PNP removal efficiency. Additionally, the autotrophic column showed better resiliency compared to the heterotrophic one.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Yi-Zhen Chen, Li-Juan Zhang, Ling-Yun Ding, Yao-Yu Zhang, Xi-Song Wang, Xue-Jiao Qiao, Bao-Zhu Pan, Zhi-Wu Wang, Nan Xu, Hu-Chun Tao
Summary: In this study, the autotrophic hydrogen-oxidizing bacterium Rhodoblastus sp. TH20 was isolated for sustainable treatment of nitrate in wastewater. Efficient removal of nitrate and recovery of biomass nitrogen were achieved with low emissions of CO2 and N2O.
ENVIRONMENTAL SCIENCE AND ECOTECHNOLOGY
(2022)
Article
Engineering, Environmental
Yi-Lu Sun, Kun Zheng, Si-Yuan Zhai, Hao-Yi Cheng, Zhi-Min Qian, Hong-Cheng Wang, Ji-Xian Yang, Xue-Ning Zhang, Ai-Jie Wang
Summary: In this study, a sulfur-based autotrophic disproportionation-denitrification (SAD2) system was successfully developed by connecting an independent sulfur-based autotrophic disproportionation (SADP) bioreactor with a SADN bioreactor. The SAD2 system achieved adjustable and high-rate nitrogen removal while avoiding sulfide emissions, surpassing the capabilities of the independent SADN system. This novel system offers a new pattern for practical applications.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Wenbo Liu, Md Hasibur Rahaman, Jun Zhai, Jacek Makinia
Summary: The study investigated the coupling transformation of carbon, nitrogen, and sulfur compounds in a full-scale horizontal subsurface flow wetland. Results showed that heterotrophic denitrification and sulfide-based autotrophic denitrification were the main pathways. Increasing TOC or NO3- concentrations promoted heterotrophic denitrification, while increasing S2- concentrations enhanced sulfide-based autotrophic denitrification.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Changzi Guo, Xuli Zhang, Wanqin Zhao, Yi Han, Liying Pei, Yinping Hou, Dangcong Peng
Summary: A sulfide autotrophic denitrification microbial fuel cell (MFC) was established to study the removal of nitrogen and sulfur and electricity generation. The results showed that simultaneous desulfurization and nitrate removal were feasible. Higher sulfide concentration favored electricity generation. Nitrate concentration had less effect on sulfide removal and electricity production. Lower external resistance improved nitrate removal efficiency. The microbial community structure differed between the anode and cathode chambers. This research provides a new idea and method for sulfur-and nitrogen-containing wastewater treatment.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Review
Environmental Sciences
Yunmeng Pang, Jianlong Wang
Summary: This paper discusses the issue of nitrate pollution in water and wastewater, as well as the use of various electron donors for biological denitrification. Depending on the types of electron donors, denitrification can be classified into heterotrophic and autotrophic denitrification.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Agricultural Engineering
Xiao Huang, Chongsen Duan, Jianghua Yu, Wenyi Dong
Summary: The research found that the transformation process can effectively reduce nitrate nitrogen discharge concentration, but there may be nitrite nitrogen accumulation in the initial stages. Three dominant denitrification genera were identified, with heterotrophic denitrification showing more complex microbial interspecific interactions.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Shaohong Zheng, Xiangyin Liu, Xiangjing Yang, Hongen Zhou, Jin Fang, Siyuan Gong, Junfeng Yang, Jiannv Chen, Tiansheng Lu, Ming Zeng, Yujie Qin
Summary: By changing the molar ratio of influent C/N/S, this study explored the denitrification performance and microbial community in mixotrophic denitrification systems. The results showed that the joint action of several genera, including Thauera, Pacacoccus, Fusibacter Pseudoxanthomonas, Thiobacillus, Sulfurovum, and Sulfurimonas, contributed to efficient denitrification. The relative abundances of Thauera, Thiobacillus, and Sulfurimonas increased after the addition of S2-, indicating a potential mechanism for improving denitrification performance in mixotrophic systems.
BIORESOURCE TECHNOLOGY
(2022)
Review
Microbiology
Lea Nosalova, Maria Piknova, Mariana Kolesarova, Peter Pristas
Summary: Since the beginning of unicellular life, dissimilation reactions of autotrophic sulfur bacteria have played a crucial role in the biogeochemical sulfur cycle on Earth. The diversity of metabolic pathways used by sulfur-oxidizing bacteria reflects a wide range of sulfur oxidation states. However, the meso- and psychrophilic chemolithoautotrophic sulfur-oxidizing microbiota inhabiting cold sulfur waters have been less studied compared to hot spring microbiota.
Article
Environmental Sciences
Xianxin Luo, Chengyi Peng, Penghui Shao, Aiping Tang, Anping Huang, Qi Wu, Longhui Sun, Liming Yang, Hui Shi, Xubiao Luo
Summary: The IHAD-MnO process developed in this study shows potential for high nitrate removal efficiency and manganese oxidation efficiency in organic-limited polluted water. It provides a highly efficient and cost-effective solution for sustainable water treatment technologies with less carbon consumption and greenhouse gas emission.
ENVIRONMENTAL RESEARCH
(2021)
Article
Agricultural Engineering
Xin Zou, Mengjiao Gao, Abdul Mohammed, Yang Liu
Summary: The role of different ammonia concentrations in an aerobic granular sludge reactor was investigated, focusing on nitrogen metabolic pathways, microbial community, and specific microbial activity. Heterotrophic ammonia oxidizing bacteria (HAOB) had higher ammonia oxidation rates (AORs) than autotrophic ammonia oxidizing bacteria (AAOB) under certain conditions. The study proposed that the inhibition of heterotrophic bacteria by free ammonia (FA) may contribute to the development of the autotrophic ammonia oxidation pathway and enrichment of AAOB.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Shu-Sen Wang, Hao-Yi Cheng, Hao Zhang, Shi-Gang Su, Yi-Lu Sun, Hong-Cheng Wang, Jing-Long Han, Ai-Jie Wang, Awoke Guadie
Summary: By comparing sulfur autotrophic denitrification (SAD) and heterotrophic denitrification (HD) filters under identical conditions, this study found that while the start-up time of SAD filter is longer, it outperforms HD filter in terms of performance and cost, showcasing potential application prospects.
ENVIRONMENTAL RESEARCH
(2021)
Article
Environmental Sciences
Fen Wang, Jing Li, Hongli Duan
Summary: A lab-scale sulfur-limestone based bioretention system with a submerged zone was used to remove nitrate-nitrogen from stormwater. The study found that denitrification mainly occurred during the first 5 days of drying period. The system effectively removed nitrate-nitrogen and met the Chinese Quality Standard for Ground Water when the influent concentration was below 30 mg/L. The sulfur autotrophic denitrification process followed a first-order kinetic model, and the dominant bacteria in the submerged zone were Thiobacillus and Halothiobacillus.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Ruo-Chen Zhang, Chuan Chen, Xi-Jun Xu, Duu-Jong Lee, Nan-Qi Ren
Summary: Compared to autotrophic and heterotrophic denitrification processes, the integrated autotrophic and heterotrophic de-nitrification (IAHD) has a wider range of applications in wastewater containing organic carbon, nitrogen, and sulfur. The interaction between heterotrophic and autotrophic denitrificans in the IAHD system ensures efficient co-removal of sulfur, nitrogen, and carbon. Experimental results showed that Pseudomonas C27 had higher metabolic activity than T. denitrificans at specific sulfide concentrations, and a mix of Pseudomonas C27 and T. denitrificans at different ratios led to the highest sulfide removal efficiency.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Multidisciplinary Sciences
Zhenguo Chen, Minlan Lou, Peizhen Fang, Dunquan Xiao, Wenting Zhu, Hongwei Chen, Wei Qian
Summary: This study investigates the structure and function of sulfur autotrophic denitrification microbial communities using sodium thiosulfate and elemental sulfur as electron donors. The results show that the nitrate removal rate and bacterial community structure are better in the sodium thiosulfate group compared to the elemental sulfur group. This research provides an experimental basis for improving the start-up time and operating cost of sulfur autotrophic denitrification systems and offers new prospects for further mechanistic analysis.
SCIENTIFIC REPORTS
(2023)
Article
Agricultural Engineering
Zhang-Wei He, Zheng-Shuo Zou, Qian Sun, Hong-Yu Jin, Xing-Ye Yao, Wen-Jing Yang, Cong-Cong Tang, Ai-Juan Zhou, Wenzong Liu, Yong-Xiang Ren, Aijie Wang
Summary: This study proposed a novel and high-efficiency strategy, freezing followed by low-temperature thermal treatment, to significantly promote short-chain fatty acids (SCFAs) production from waste activated sludge. The maximal production of SCFAs was achieved with a shortened retention time, and the potential carbon source recovery was increased compared to traditional freezing/thawing treatment. Additionally, the strategy accelerated the solubilization and hydrolysis steps of the sludge and enriched acid-producing microorganisms.
BIORESOURCE TECHNOLOGY
(2022)
Review
Engineering, Environmental
Bo Wang, Wenzong Liu, Bin Liang, Jiandong Jiang, Aijie Wang
Summary: This paper comprehensively reviews the principles and applications of the hybrid microbial electrochemical anaerobic digestion system. The fundamentals, configurations, classifications, and influential factors of the system's performances are examined. The effects of extracellular electron transfer on biomethane production are analyzed. In addition, (electro)methanogenesis, microbial interactions, and ecological networks of microbial consortia in the system are summarized. Future developments and perspectives on MEC-AD for biomethane production are proposed.
Article
Engineering, Environmental
Ye Yuan, Wanxin Yin, Yutong Huang, Anqi Feng, Tianming Chen, Liang Qiao, Haoyi Cheng, Wenzong Liu, Zhaoxia Li, Cheng Ding, Fan Chen, Aijie Wang
Summary: The intermittent electric field stimulated reduction-oxidation coupled process can enhance the biodegradation of azo dyes. Weak intermittent electrostimulation can boost anaerobic cathodic reduction and micro-oxygen-assisted anodic oxidation, promoting the generation of organic compounds to drive biocathode decolorization. Compared to continuous electrostimulation, intermittent electrostimulation exhibits better electron transfer capability and creates a more favorable oxidation-reduction potential. Intermittent electrostimulation also enriches functional consortia with electroactivity and azo dye metabolism capabilities.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Engineering, Environmental
Shuang Luo, Zhi-Yuan Zhao, Ying Liu, Ran Liu, Wen-Zong Liu, Xiao-Chi Feng, Ai-Jie Wang, Hong-Cheng Wang
Summary: Recent advances in the integrated bioelectrochemical-constructed wetland systems (BES-CWs) for antibiotics removal have shown promise, providing a competitive and environmentally friendly alternative to physicochemical methods. Understanding the reaction features, operation manners, economic and ecological benefits of BES-CWs is crucial for further technological development. However, successful application of BES-CWs to antibiotics-containing wastewater remediation requires a thorough evaluation of its performance, mechanism, typical attributes, and a comprehensive potential assessment in terms of environmental and economic analysis.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Jia-Qi Yang, Zhi-Ling Li, Bin Wu, Ya-Ru Jin, Di Cao, Jun Nan, Xue-Qi Chen, Wen-Zong Liu, Shu-Hong Gao, Ai-Jie Wang
Summary: This study found that microplastic exposure significantly affected the microbial reductive dechlorination activities of 2,4,6-trichlorophenol. Different types and sizes of microplastics showed varying effects on dechlorination performance, with PET being the most promoted and PP being the most inhibited. Bio-enrichment on hydrophilic surfaces of microplastics was speculated to be responsible for the favored dechlorination activity. However, extended exposure to microplastics resulted in overall inhibited dechlorination performance.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Di Cao, Zhi-Ling Li, Ke Shi, Bin Liang, Zhongli Zhu, Wenzong Liu, Jun Nan, Kai Sun, Ai-Jie Wang
Summary: The mechanism of microbiome assembly and function driven by cathode potential in an electro-stimulated microbial reductive dechlorination system was investigated. The study found that lower cathode potentials resulted in higher dechlorination rate and increased methane production. The taxonomic and functional structure of the core microbiome also significantly shifted with different cathode potentials. The findings suggest that cathode potential plays an important role in controlling the assembly of the microbiome and its functions.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Ziqi Zhang, Wenzong Liu, Qun Gao, Fang Huang, Yuanyuan Kang, Yusheng Pan, Gaoyang Luo, Xu Zhou, Lu Fan, Aijie Wang, Shu-Hong Gao
Summary: Wastewater treatment plants (WWTPs) play a crucial role in removing microplastics (MPs) from urban wastewater. However, there is currently a lack of reliable and efficient methods for extracting MPs, especially in organic-rich matrices such as sludge samples. In this study, a two-step digestion process was developed and optimized, allowing for over 90% extraction efficiency of MPs from sludge samples. The recommended dosage of digestion reagents was found to be 100 ml 30% H2O2 + 100 ml 1 M HNO3 for samples with mixed liquid volatile suspended solids (MLVSS) levels lower than approximately 0.43 g. This study also examined the characteristics of MPs in two WWTPs in Shenzhen, revealing high concentrations of MPs in influent, effluent, and dewatered sludge, with rayon and polyester being the dominant polymers.
Article
Green & Sustainable Science & Technology
Xu Kang, Yu Liu, Wenzong Liu, Ling Wang, Chaolin Li
Summary: This study investigated the effect of organic load on fermentation and biogas production in a bioelectrolysis-assisted AD reactor. The results showed that the integrated system had a stronger tolerance to organic loads than the traditional anaerobic system. Under a high organic load, the methanogenic rate, total methane yield, and SS removal rate significantly increased.
Review
Engineering, Environmental
Zhang-Wei He, Fei Wang, Zheng-Shuo Zou, Cong-Cong Tang, Ai-Juan Zhou, Wenzong Liu, Yong-Xiang Ren, Zhihua Li, Aijie Wang
Summary: Waste activated sludge (WAS) is a major by-product of wastewater treatment plants, and anaerobic digestion (AD) is a promising technology for resource recovery and sludge stabilization. However, the presence of refractory organics, specifically humic acid (HA), in WAS can affect AD. This review summarizes recent advances in understanding the fates, roles, and mitigation strategies of HA in AD of WAS, and highlights the need for further research on the dynamic evolution and transformation pathways of HA, as well as the multi-functional roles it plays in electron transfer pathways and microbial communities.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Xiangyu Gao, Jiaqi Yang, Wenzong Liu, Xiqi Li, Wenzhe Zhang, Aijie Wang
Summary: The loss and negative impacts of nitrogen from fertilized soils remain a global challenge in agriculture. Alkaline biochar, as a soil amendment with improved adsorption capacities, shows promising effects in mitigating nitrogen loss and improving nitrogen availability. This study investigated the effects of alkaline biochar on nitrogen mitigation, the interactions among mixed soils, and the potential use of a urea inhibitor in reducing nitrogen loss.
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Zhixuan Cui, Zhihong Liu, Yaxin Fan, Zhang-Wei He, Wenzong Liu, Xiuping Yue, Aijuan Zhou
Summary: In this study, a novel coupling strategy of Fe(II)-activated PDS pretreatment with SRB was explored to enhance methane yield from WAS during AD. Results showed that Fe(II)_PDS + SRB and ZVI_PDS + SRB had a similar methane yield, which was higher than other groups. The hydrolysis rate constant in Fe(II)_PDS + SRB was also higher than that in ZVI_PDS + SRB. The concentration of SCFAs and the ultimate utilization efficiency of SCFAs were higher in the Fe(II)_PDS + SRB group, providing a more ideal substrate for methanogens. Furthermore, the study revealed the intrinsic interaction of functional microbial consortia in the Fe(II)_PDS + SRB group.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Biotechnology & Applied Microbiology
Xiangyu Gao, Wenzong Liu, Xiqi Li, Wenzhe Zhang, Shenglin Bu, Aijie Wang
Summary: The authors prepared a new straw decomposition agent using three fungi (Trichoderma viride, Penicillium, and Phanerochaete chrysosporium burdsall) for lignin, cellulose, and hemicellulose decomposition. The highest efficiency was achieved when the three fungi were mixed in a mass ratio of 1:1:1, resulting in a straw decomposition rate of 45.2% in a 10-day continuous reaction. The depth of straw in soil and the application of composite fertilizer were found to play important roles in straw decomposition. Nutrient release from straw decomposition was observed, with maximum release rates of 48.3% for N, 60.3% for P, and 72.1% for K after 90 days of reaction. The novel straw decomposition agent showed comparable performance to commercial straw decomposition agents, indicating its great potential in practical applications.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2023)
Article
Green & Sustainable Science & Technology
Qiandi Wang, Xiqi Li, Wenzong Liu, Siyuan Zhai, Qiongying Xu, Chang'an Huan, Shichen Nie, Qinghua Ouyang, Hongcheng Wang, Aijie Wang
Summary: Carbon cycle regulation and GHG emission abatement in WWTPs can improve sustainability. However, external carbon sources used for nitrogen removal and waste sludge disposal aggravate the carbon footprint. In this study, carbon was recovered from primary sludge through acidogenic fermentation and used for denitrification in an industrial WWTP. The recovered carbon sources enhanced denitrification and contributed to GHG emission reduction.
ENVIRONMENTAL SCIENCE AND ECOTECHNOLOGY
(2023)
Article
Environmental Sciences
Qi Sun, Ying-Ke Fang, Wen-Zong Liu, Nan Xie, Heng Dong, Awoke Guadie, Ying Liu, Hao-Yi Cheng, Ai-Jie Wang
Summary: In recent years, biological sulfur (bio-S) has been used in sulfur autotrophic denitrification (SAD) with autotrophic Thiobacillus denitrificans and heterotrophic Stenotrophomonas maltophilia. The growth pattern of T.denitrificans and S.maltophilia showed a linear relationship between OD600 and CFU below certain thresholds. S.maltophilia's DsrA could produce sulfide as an alternative electron donor for T.denitrificans. The interaction of T.denitrificans and S.maltophilia reduced nitrite accumulation and improved denitrification efficiency.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Environmental
Qiandi Wang, Qiongying Xu, Siyuan Zhai, Qindi Zhao, Wenzong Liu, Zhuqi Chen, Aijie Wang
Summary: This study provides experimental evidence for the coordination reaction between tetracycline and aluminum ions by discovering a fluorescence response triggered by their interaction. The redshifted n-π* transition observed through fluorescence and differential electron absorption spectroscopy indicates the occurrence of the coordination reaction. Additionally, the study found that the complexation of aluminum ions with tetracycline leads to a split retention time in liquid chromatogram.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Rong-Gui Zhu, Chang-Gui Pan, Feng-Jiao Peng, Chao-Yang Zhou, Jun-Jie Hu, Kefu Yu
Summary: This comprehensive survey investigated the occurrence, bioaccumulation, and trophic magnification of parabens and their metabolite 4-HB in a marine food web. Results showed that parabens were the predominant pollutants in marine organisms, with significant bioaccumulation from sediments. The estimated trophic magnification factor indicated biomagnification for MeP and trophic dilution for 4-HB. Overall, the risks for humans consuming marine organisms were found to be low.
Article
Engineering, Environmental
Andres F. Torres-Franco, Deborah Leroy-Freitas, Cristina Martinez-Fraile, Elisa Rodriguez, Pedro A. Garcia-Encina, Raul Munoz
Summary: Anaerobic and microalgae-based technologies have emerged as sustainable alternatives for municipal wastewater treatment. However, the presence of viruses in the treated wastewater is a major concern for reuse applications. This study assessed the ability of these technologies to reduce viruses during secondary wastewater treatment. The results showed that all technologies were effective in reducing the concentration of viruses, with microalgae-based treatment exhibiting the highest potential for reducing the disinfection requirements of treated wastewater.
Article
Engineering, Environmental
Young Gwang Kim, Sae Yun Kwon, Spencer J. Washburn, Scott C. Brooks, Ji Won Yoon, Lucien Besnard
Summary: The study uses Hg isotope ratios to identify the sources and exposure pathways of mercury in bivalves, finding that dissolved Hg phases in the water column are the primary source and exposure pathway to bivalves. This provides new insights into using bivalves as bioindicators for sediment quality monitoring.
Article
Engineering, Environmental
Hui Geng, Ying Xu, Rui Liu, Dianhai Yang, Xiaohu Dai
Summary: This study investigates the effect of cation exchange resin (CER) on the sequential recovery of hydrogen and methane from anaerobic digestion (AD) and the corresponding mechanisms. The results show that CER can simultaneously enhance the production of hydrogen and methane by promoting the solubilisation, hydrolysis, and acidification of organic matter. Additionally, CER facilitates effective contact between bacteria and organic particulates and reduces the energy barrier for mass transfer during methane production. The study also reveals changes in the microbial community structure and metagenomics during the AD process.
Article
Engineering, Environmental
Xiaojing Lin, Zhan Jin, Shunfeng Jiang, Zhiquan Wang, Suqing Wu, Ke Bei, Min Zhao, Xiangyong Zheng
Summary: Dehumidification combined with addition of absorbent resin supplement (ARS) was used to achieve rapid evaporation of non-pretreated urine, resulting in high water evaporation efficiency and nutrient recovery.
Article
Engineering, Environmental
Yangli Che, Chaoran Lin, Shen Li, Jiao Liu, Longhai Zhu, Shilei Yu, Nan Wang, Haoshuai Li, Mutai Bao, Yang Zhou, Tonghao Si, Rui Bao
Summary: Hydrodynamic processes play a crucial role in the transmission of sediments, microbial assembly, and organic carbon redistribution in the ocean. Through experiments and analysis, we found that hydrodynamics shape the assembly of microbial communities and control the redistribution of different sourced organic carbon, thereby influencing microbial-mediated biogeochemical transformation.
Article
Engineering, Environmental
Chao Chen, Yu Yang, Nigel J. D. Graham, Zhenyu Li, Xingtao Yang, Zhining Wang, Nadia Farhat, Johannes S. Vrouwenvelder, Li -an Hou
Summary: The fouling of seawater reverse osmosis membranes is a persistent challenge in desalination. This study monitored the operational performance of a desalination plant for 7 years and the fouling development in different areas of membrane modules. The findings showed that operational performance declined over time and fouling mainly occurred at the feed side of the modules, with the highest microbial diversity. Keystone species like Chloroflexi and Planctomycetes played an important role in maintaining community structure and biofilm maturation. Polysaccharides, soluble microbial products, marine humic acid-like substances, and inorganic substances contributed to fouling. Overall, biofouling had a significant impact on membrane fouling after 7 years of operation.
Article
Engineering, Environmental
Dan Li, Jieyi Sun, Yibo Fu, Wentao Hong, Heli Wang, Qian Yang, Junhong Wu, Sen Yang, Jianhui Xu, Yunfei Zhang, Yirong Deng, Yin Zhong, Ping'an Peng
Summary: Sulfidation-oxidation treatment of magnetite (Fe3O4) enhances the production of dark center dot OH, which can efficiently degrade dissolved organic matter (DOM) and accelerate carbon cycling.
Article
Engineering, Environmental
Cheng Yu, Kaijun Wang, Kaiyuan Zhang, Ruiyang Liu, Pingping Zheng
Summary: This study implemented a microaerobic-aerobic configuration in a full-scale municipal wastewater treatment facility and investigated the effects on sludge characteristics, pollutant removal, microbial community, and granulation mechanisms. The results showed successful transition from flocculent-activated sludge to well-defined AGS after two months of operation. The primary pathways for pollutant removal were simultaneous nitrification, denitrification, and phosphorus removal. Moreover, the incorporation of internal separators induced shifts in the flow pattern, which promoted granulation.
Article
Engineering, Environmental
Zhe Zhang, Shaoyang Hu, Guangrong Sun, Wei Wang
Summary: Halogenated aromatic disinfection byproducts (DBPs), such as halogenated phenols, have garnered widespread attention due to their high toxicity and prevalence. This study reports on the analysis, occurrence, and cytotoxicity of a group of emerging halogenated aromatic DBPs, known as halogenated polyhydroxyphenols (HPPs), in drinking water.
Article
Engineering, Environmental
Shengyue Chen, Jinliang Huang, Peng Wang, Xi Tang, Zhenyu Zhang
Summary: Accurate prediction of river water quality is crucial for sustainable water management. This study introduces wavelet analysis and transfer learning techniques to assist LSTM modeling, proposing a newly coupled modeling approach that improves short-term prediction of river water quality.
Article
Engineering, Environmental
Bang Du, Xinmin Zhan, Piet N. L. Lens, Yifeng Zhang, Guangxue Wu
Summary: Efficient anaerobic digestion relies on the cooperation of different microorganisms with different metabolic pathways. This study investigated the effects of different operational modes and the addition of powdered activated carbon (PAC) on ethanol metabolic pathways. The results showed that the SBR mode and the presence of CO2 facilitated ethanol metabolism towards propionate production, while the CFR mode with extended solids retention time enriched Geobacter. Adjusting operational modes and PAC addition can modulate anaerobic ethanol metabolism and enrich Geobacter.
Article
Engineering, Environmental
Wanfa Wang, Si-Liang Li, Jun Zhong, Yuanbi Yi, Fujun Yue, Zenglei Han, Qixin Wu, Ding He, Cong-Qiang Liu
Summary: This study compares the carbon biogeochemical processes in karst and non-karst regions within large thermal stratified river-reservoir systems. The results demonstrate that karst reservoirs have a reduced potential for carbon emissions and highlight the importance of considering geologic settings to improve accuracy in regional and global CO2 emission estimates.
Article
Engineering, Environmental
Chunxia Jiang, Zelong Zhao, Dong Zhu, Xiong Pan, Yuyi Yang
Summary: This study analyzed the occurrence and distribution of antibiotic resistance genes (ARGs) in different environmental media of the Yangtze River using metagenomics. Core resistome dominated by multidrug resistance genes was found in all samples, while rare resistome dominated by various resistance genes was more prevalent in plasmids. Specific bacteria were identified as hosts for both core and rare resistomes, with high clinical concern ARGs found in the rare resistome. Particle-associated environment provided the most ideal conditions for resistome hosts. This study provided insights into the genetic locations of ARGs and the community assembly mechanisms of ARG hosts in freshwater environments.
Article
Engineering, Environmental
Yu Zhang, Yongtao He, Linchun Jia, Lei Xu, Zheng Wang, Yueling He, Ling Xiong, Xumeng Lin, Hong Chen, Gang Xue
Summary: By synergizing organic carbon source, thiosulfate, and zero-valent iron, efficient mixotrophic denitrification of oligotrophic secondary effluent can be achieved. Thiosulfate plays a vital role in promoting TN removal efficiency, while corrosion of Fe0 releases OH- to neutralize H+ from thiosulfate-driven denitrification, creating a suitable environment for denitrification. The coordination of thiosulfate and Fe0 maintains the dominance of Thiobacillus for denitrification.