Article
Engineering, Environmental
Shuqi Ren, Yingrui Liu, Yanying He, Tingting Zhu, Xueming Chen, Yiwen Liu
Summary: A mathematical model was developed to describe the dynamics of N2O production in the denitrifying phosphorus removal (DPR) system. This model clarified the source and pathways of N2O production and showed the competition between denitrifying polyphosphate-accumulating organisms (DPAOs) and denitrifying glycogen-accumulating organisms (DGAOs) in the system. Simulation results demonstrated the importance of operational conditions on N2O production and nutrients removal efficiency.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Agricultural Engineering
Yangang Lin, Yawen Sun, Liyuan Zhang, Qiong Zhang, Xiyao Li, Jun Sui, Yongzhen Peng
Summary: Balancing the removal of nitrogen and phosphorus in municipal wastewater under carbon limitation remains challenging. The key parameter in achieving this balance is the COD-to-PO43--P ratio. By operating an A(2)/O-BCO system for 205 days, it was found that increasing the COD/P ratio deteriorated the nitrogen removal performance, while decreasing it led to the proliferation of Ca.Competibacter and an increase in nitrogen removal. The nitrogen and phosphorus removal efficiency reached up to 79.3% and 95.2%. Overall, establishing a balance between DGAOs and DPAOs through strengthening the effect of DGAOs can improve nutrient removal performance and enhance the stability and efficiency of the system.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Cong Li, Qian Wang, Wenlin Jia
Summary: The study achieved denitrifying phosphorus removal in sequencing batch reactors using different carbon sources, and investigated factors affecting N2O production. When propionate was used as the carbon source, nitrogen removal was lower and N2O production was greatly reduced. The higher N2O production in the acetate system was attributed to the enrichment of ordinary heterotrophic organisms.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Qingan Meng, Wei Zeng, Zhiwei Fan, Jianmin Li, Yongzhen Peng
Summary: This study investigated the impact of different levels of polyphosphate on DPAOs and found that a high C/P ratio led to a shift from polyphosphate accumulating metabolism to glycogen accumulating metabolism. DPAOs under glycogen accumulating metabolism showed a significantly higher nitrate reduction rate. Additionally, these DPAOs exhibited better tolerance to free nitrous acid, although it resulted in the destruction of N2O reductase and the accumulation of N2O. Flow cytometry analysis revealed that free nitrous acid caused DPAOs to over-consume ATP and depolarize, inhibiting their growth.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Jun Yin, Kristopher A. Hunt, Ting Xie, Bao Nguyen Quoc, Kim Tran, David A. Stahl, Mari-Karoliina H. Winkler
Summary: Coupling denitrifying polyphosphate accumulating organisms (DPAO) with anaerobic ammonium oxidizing (Anammox) bacteria in a single treatment scheme has challenges due to their competition for nitrite and different growth rates. This study aimed to uncouple their solid retention time (SRT) by growing them in different sludge fractions and found that Anammox bacteria had higher nitrite affinity in biofilms, while DPAO were more sensitive to nitrite and better suited for growth in the protective biofilm.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Dimitris Andreadakis, Constantinos Noutsopoulos, Gerasimos Fragkiskatos, Daniel Mamais, Theodora Misirli, Kyriaki Argyropoulou, Eva Themeli, Simos Malamis
Summary: The study found that Free Nitrous Acid (FNA) and Free Ammonia (FA) have inhibitory effects on enhanced biological phosphorus removal (EBPR), particularly on the aerobic phosphorus uptake rate (PUR). The results suggest that under high nitrogen loading, EBPR alongside nitritation-denitritation may not be a viable option.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Microbiology
Yubo Wang, Han Gao, George F. Wells
Summary: This study used genome-resolved metagenomics and metatranscriptomics to investigate denitrifying bioprocesses enriched in yet-uncultivated denitrifying PAOs. The transcriptionally most active populations included several PAOs, a competing glycogen accumulating organism, and other non-PAO microorganisms. The potential cooperation between these different populations may help reduce the accumulation of toxic nitric oxide.
ENVIRONMENTAL MICROBIOLOGY
(2021)
Article
Agricultural Engineering
Yawen Sun, Yongzhen Peng, Yanhui Chen, Qiong Zhang, Xiyao Li
Summary: The response mechanism of denitrifying phosphate-accumulating organisms (DPAOs) under starvation conditions was investigated. The decay of metabolic activity contributed to the damaged denitrifying phosphorus removal (DPR) performance, while the biomass decay had a smaller impact. The genus Dechloromonas, affiliated to DPAOs, exhibited stronger adaptability to starvation.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Ivar Zekker, Anni Mandel, Ergo Rikmann, Madis Jaagura, Siim Salmar, Makarand Madhao Ghangrekar, Taavo Tenno
Summary: Lowering air supply and organic carbon demand are key factors in reducing wastewater treatment costs and preventing eutrophication. Utilizing denitrifying polyphosphate accumulating organisms (DPAOs) in the denitrifying PO4-- removal (DPR) process with nitrate has shown efficient removal of COD, nitrogen, and phosphorus in wastewater with high nitrite and nitrate content. The use of nitrate attenuation against nitrite toxicity can be economically justified in full-scale treatment applications.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Mingchang Gao, Shaofang Sun, Qi Qiu, Weiwei Zhou, Liping Qiu
Summary: This study employed the alternating anoxic-anaerobic/aerobic biofilter system for DPAOs enrichment and successfully achieved simultaneous nitrogen and phosphorus removal from domestic wastewater. Results showed that DPAOs contributed 84% to the overall phosphorus removal after 60 days of operation.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Environmental
Jiayu Zhang, Wei Zeng, Qingan Meng, Hongjun Liu, Sijia Lu, Yongzhen Peng
Summary: This study investigated the denitrifying phosphorus removal (DPR) performance of Tetrasphaera at different nitrite concentrations. The results showed that Tetrasphaera can efficiently remove nitrite and phosphorus at an appropriate nitrite concentration. Additionally, this study found that the Tet2-892 clade of Tetrasphaera is more tolerant to FNA inhibition.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Agricultural Engineering
Wen-Jing Xia, Hao Wang, Lin-Qian Yu, Gui-Feng Li, Jin-Rui Xiong, Xiao-Yan Zhu, Xue-Chao Wang, Jia-Rui Zhang, Bao-Cheng Huang, Ren-Cun Jin
Summary: This study comprehensively evaluated the long-term effect of coagulants addition on EBPR systems and found that initial addition of coagulants can effectively reduce chemical oxygen demand and phosphorus concentration in the effluent. However, further addition of metal salts has a negative impact on microbial activities, causing cell membrane damage and deteriorating phosphorus removal performance.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Bohan Chen, Yong Li, Zhizhan Luo, Mengen Lei, Xiaolei Zhang, Ji Li
Summary: This study reveals the important role of denitrifying glycogen-accumulating organisms (DGAOs) in sludge granulation, which can help wastewater treatment plants (WWTPs) formulate specific operation strategies to promote the extent of sludge granulation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Environmental Sciences
Hongliang Dai, Ting Han, Tongshuai Sun, Hui Zhu, Xingang Wang, Xiwu Lu
Summary: The paper discusses the emission characteristics and influencing factors of N2O in denitrifying P removal processes, proposing appropriate strategies for controlling N2O emissions. This work serves as a basis for the development of new sewage treatment processes and the reduction of greenhouse gas emissions in future wastewater treatment plants.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Agricultural Engineering
Zhihao Peng, Qiong Zhang, Xiyao Li, Shouyou Gao, Caifang Jiang, Yongzhen Peng
Summary: In this study, steady endogenous partial denitrification (EdPD) was achieved by regulating the competition and cooperation between microorganisms, resulting in a balanced phosphorus removal efficiency and nitrite transformation rate, which contributed to advanced nitrogen removal.
BIORESOURCE TECHNOLOGY
(2024)
Article
Engineering, Environmental
Haoran Duan, Liu Ye, Xuanyu Lu, Zhiguo Yuan
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2019)
Article
Engineering, Environmental
Liguo Zhang, Haoran Duan, Liu Ye, Lei Liu, Damien J. Batstone, Zhiguo Yuan
Article
Engineering, Environmental
Yuan Yan, Yayi Wang, Weigang Wang, Shuai Zhou, Junjie Wang, Jianhua Guo
Article
Engineering, Environmental
Limin Lin, Steven Pratt, Maxime Rattier, Liu Ye
Article
Engineering, Environmental
Shuai Zhou, Yijing Zhu, Yuan Yan, Weigang Wang, Yayi Wang
Review
Engineering, Environmental
Haoran Duan, Shuhong Gao, Xuan Li, Nur Hafizah Ab Hamid, Guangming Jiang, Min Zheng, Xue Bai, Philip L. Bond, Xuanyu Lu, Mariella M. Chislett, Shihu Hu, Liu Ye, Zhiguo Yuan
Article
Engineering, Environmental
Haoran Duan, Ben van den Akker, Benjamin J. Thwaites, Lai Peng, Caroline Herman, Yuting Pan, Bing-Jie Ni, Shane Watt, Zhiguo Yuan, Liu Ye
Article
Environmental Sciences
Nur Hafizah Ab Hamid, David K. Wang, Simon Smart, Liu Ye
Article
Engineering, Environmental
Limin Lin, Steven Pratt, Oliver Crick, Jun Xia, Haoran Duan, Liu Ye
Summary: The study found that NaCl, KCl, and Na2SO4 have different inhibitory effects on freshwater Anammox bacteria, with NaCl inhibiting the transport of ammonium and Na2SO4 inhibiting the transport of nitrite and ammonium. High salinity inhibits functional enzyme activity, indicating that both ionic stress and ion composition contribute to the observed inhibition effects.
Article
Environmental Sciences
Shuai Zhou, Cong Xiong, Yinglong Su, Yayi Wang, Yuanyuan Gao, Zhenping Tang, Boyang Liu, Yueyue Wu, Yi Duan
Summary: Both heavy metals and radiation can impact the proliferation and dissemination of emerging antibiotic resistance pollutants. The profile of antibiotic resistance in uranium mines, which are rich in radioactive metals, is largely unknown. This study investigated the distribution and influencing factors of antibiotic-resistant bacteria (ARB) and antibiotic resistance genes (ARGs) in a uranium mine in Guangdong province, China. The findings demonstrate the occurrence of ARB and ARGs in uranium mines for the first time, which contributes to assessing and controlling the ecological risk of antibiotic resistance in radioactive environments.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Zhenping Tang, Yu Zhang, Shasha Xiao, Yuanyuan Gao, Yi Duan, Boyang Liu, Cong Xiong, Zhengqing Yang, Yueyue Wu, Shuai Zhou
Summary: This study investigated the effects of a typical ketone on the variations of antibiotic resistance in E. coli. The results showed that low concentrations of the ketone inhibited the growth of resistant strains, but higher concentrations promoted the spread and expression of resistance genes while further inhibiting bacterial growth.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Zhenping Tang, Yu Zhang, Siqi Zhang, Yuanyuan Gao, Yi Duan, Taotao Zeng, Shuai Zhou
Summary: Starvation in activated sludge has an impact on the abundance of antibiotic resistant bacteria and antibiotic resistance genes. Carbon starvation reduces the abundance effectively, while anaerobic-aerobic starvation mitigates the abundance significantly. These findings provide guidance for controlling antibiotic resistance risk in wastewater treatment plants.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Shuai Zhou, Yanxing Xie, Feiyu Zhu, Yuanyuan Gao, Yingjiu Liu, Zhenping Tang, Yi Duan
Summary: A novel composite material (PAO/GO/CS) was prepared to address the difficulty of separating GO from water due to its high hydrophobicity and dispersibility. This composite showed improved adsorption performance for U(VI) through cross-linking reaction between GO and chitosan.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Yi Duan, Shukui Zhou, Lin Deng, Zhou Shi, Haiyan Jiang, Shuai Zhou
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2020)
Article
Engineering, Environmental
Nur Hafizah Ab Hamid, Simon Smart, David K. Wang, Kaniel Wei Jun Koh, Kalvin Jiak Chern Ng, Liu Ye
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2020)
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.