Article
Engineering, Environmental
Chunhong Shi, Bo Yan, Xiangmeng Zuo, Cheng Wang, Zifu Li, Lixin Zhu
Summary: This study investigated the effect of aeration mode on membrane bioreactors (MBRs) for rural greywater treatment using self-designed hollow fiber and flat sheet MBRs. The study systematically analyzed pollutant removal efficiency, sludge characteristics, and membrane fouling mechanisms under intermittent and continuous aeration modes. The results showed that MBRs under intermittent aeration had higher permeability and better removal rates of nitrogen and phosphorus compared to continuous aeration. The study also identified Thermomonas as a participant in extracellular polymeric substance synthesis. Overall, this study provides valuable insights for evaluating the influence of aeration modes on MBRs and guiding better control of membrane fouling and greywater treatment.
ENVIRONMENTAL ENGINEERING RESEARCH
(2023)
Article
Engineering, Environmental
Chunhong Shi, Bo Yan, Xiangmeng Zuo, Cheng Wang, Zifu Li, Lixin Zhu
Summary: This study investigated the effect of aeration mode on membrane bioreactors (MBRs) for rural greywater treatment. The results showed that the permeability of MBRs in intermittent aeration mode was higher than that in the continuous aeration mode, and the TN and TP removal rates were also higher. The hollow-fiber membrane was more susceptible to biofilm formation and biological fouling compared to the flat-sheet organic membrane. The relative abundance of Thermomonas was positively correlated with EPS concentration, indicating its involvement in EPS synthesis. This study provides important insights for evaluating the influence of aeration modes on MBRs and improving membrane fouling control in rural greywater treatment.
ENVIRONMENTAL ENGINEERING RESEARCH
(2023)
Article
Environmental Sciences
Bingxin Li, Ruochen Wang, Weiwei Zuo, Yi Peng, Dong An, Liang Zhang, Zheng Ge
Summary: A lab-scale ceramic membrane bioreactor (MBR) with an active membrane-fouling control system was developed for the partial nitrification (PN) process. The in situ membrane cleaning method was used for uninterrupted removal of contaminants on the membrane surface. The device increased critical flux, reduced gel layer resistance (R-g), and internal resistance (R-i) of the flat-sheet ceramic membrane by inhibiting cake layer formation. In long-term experiments, nitrite oxidizing bacteria (NOB) were successfully suppressed, achieving high nitrite accumulation rate (NAR) of up to 90.09%. The maintained balance between effluent NO2--N/NH4+-N ratios would promote the proliferation of Anammox bacteria and the autotrophic nitrogen removal (ANR) process. Moreover, in situ cleaning significantly reduced energy input from aeration and ensured stable PN performance by avoiding over aeration.
Review
Biotechnology & Applied Microbiology
Aditya Anand, Sarada Prasanna Mallick, Bhisham Narayan Singh, Shikha Kumari, Dheerendra Kumar Suman, Satyavrat Tripathi, Divakar Singh, Pradeep Srivastava
Summary: Bioreactors are essential in tissue engineering for controlled and reproducible changes in damaged tissue formation, as well as for large-scale production of artificial organs. They provide the necessary artificial microenvironment for cells to grow and develop into tissues and organs, thus serving as effective tools in generating transplantable organs and ensuring safe and cost-effective production of tissue-engineered constructs.
BIOTECHNOLOGY AND BIOPROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Kaixin Yi, Yichen Ouyang, Jinhui Huang, Haoliang Pang, Chunhua Liu, Wenli Shu, Cong Ye, Jinkun Guo
Summary: Microbial quorum quenching (QQ) is an effective approach to mitigate biofouling in MBRs by reducing biopolymers production and improving sludge conditions. This study investigated the impact of aeration rate on the performance, membrane fouling, and energy consumption of QQ-MBR and C-MBR. It was found that QQ significantly mitigates biofouling, but the efficiency is lowest at high aeration intensity. QQ also reduces the content of SMP and EPS in sludge, with better performance at moderate aeration intensity. High aeration intensity results in the highest energy consumption, while QQ can optimize energy consumption by minimizing aeration intensity.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Jing Wang, Miao Lv, YongHao Huang, Le Huang, XianBin Ying, YingFeng Xu, DongSheng Shen, HuaJun Feng, Xiang Zhang
Summary: Aeration scouring is a common membrane fouling control technology, with optimization of aeration parameters improving efficiency and reducing energy consumption. The DES turbulence model was found to have higher precision in predicting shear force than the k-epsilon model, with the optimal parameters being 20mm pore spacing, 100mm height, and 2.0mm aperture.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Yongsun Jang, Hwa-Soo Ryoo, Yong-Cheol Shin, Hee-deung Park
Summary: This study conducted fluid-structure interaction simulations of a reciprocating membrane bioreactor under various conditions. The results showed that the reciprocating speed, motion shape, and slackness all have a significant impact on the shear stress. Excessively high speed lowers the shear stress, while both acceleration and deceleration in motion are crucial for generating high shear stress. Increasing slackness decreases membrane tension and thus reduces shear stress.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Environmental
Haoliang Pang, Jinhui Huang, Xue Li, Kaixin Yi, Suzhou Li, Zhexi Liu, Wei Zhang, Chenyu Zhang, Si Liu, Yanling Gu
Summary: In this research, electrospun fiber coated hydrogel QQ beads (QQ-ECHB) were fabricated for the first time, which showed long-lasting QQ activity and stable physical washing effect. The QQ-ECHB significantly prolonged the time to reach transmembrane pressure (TMP) of 40 kPa in a membrane bioreactor (MBR) and maintained its structural strength and stability under cyclic compression and fluctuations in sewage quality.
Article
Environmental Sciences
Yili Chen, Qian Sheng, Jianjian Wei, Qinghe Wen, Dehua Ma, Jiansheng Li, Yawei Xie, Jinyou Shen, Xiuyun Sun
Summary: In this study, a PVDF membrane modified with ozonation catalyst nano-MnO2 was used in MBR, coupled with in-situ ozonation to improve anti-biofouling performance. The combined approach effectively reduced membrane biofouling rate and increased membrane cleaning cycle, providing a new strategy for controlling membrane biofouling in MBR treating industrial wastewater.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Liguo Shen, Qihang Wu, Qunfeng Ye, Hongjun Lin, Jianzhen Zhang, Cheng Chen, Rong Yue, Jiaheng Teng, Huachang Hong, Bao-Qiang Liao
Summary: A three-dimensional computational fluid dynamics (CFD) model was used to simulate the hydrodynamic characteristics of a flat sheet membrane bioreactor (MBR). The optimization of membrane module configuration and operating conditions was performed to mitigate membrane fouling. Increasing the mixed liquor suspended solids (MLSS) concentration was found to improve the uniform distribution of shear stress. Additionally, a novel in-situ aeration method dramatically improved the turbulence and bubble distribution.
Article
Engineering, Environmental
Siddharth Gupta, Hassan Gomaa, Madhumita B. Ray
Summary: The potential of membrane fouling in a submerged membrane reactor due to particle deposition was investigated using aeration and membrane oscillations. Experimental and simulation results showed that membrane oscillation was a more effective fouling mitigation strategy compared to aeration, with higher shear rates. Photocatalytic degradation was used to characterize the system performance, and the results confirmed the superiority of membrane oscillation.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Dandan Zhao, Chen Fu, Xuejun Bi, How Yong Ng, Xueqing Shi
Summary: The study demonstrated that coarse bubble aeration can effectively reduce membrane fouling and increase total nitrogen removal rate, while promoting the accumulation of denitrifying bacteria on bio-carriers.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Shuai Guo, Wenbo Yu, Hongyang Zhao, Changfei Lai, Shijie Bian, Pan Jin, Sha Liang, Shushan Yuan, Liang Huang, Songlin Wang, Huabo Duan, Feifei Wang, Jiakuan Yang
Summary: This study investigated the strategy of passive aeration in a semi-aerobic landfill using numerical simulation methods. The results showed that the diameter and spacing of tubes, as well as the landfill depth, have substantial impacts on the aerobic zone ratio of the landfill. These findings contribute to the development of more efficient and sustainable solid waste treatment strategies in semi-aerobic landfills.
Article
Engineering, Environmental
Tulay Yilmaz, Emir Kasim Demir, Senem Teksoy Basaran, Emine Ubay Cokgor, Erkan Sahinkaya
Summary: Uncontrolled discharge of highly toxic textile industry wastewater causes serious problems in the environment, especially nitrogen-derived pollutants. This study aimed to evaluate the impact of intermittent aeration on organic matter, color, and nitrogen removal in a membrane bioreactor (MBR) receiving real textile wastewater. The results showed that intermittent aeration provided higher nitrogen removal efficiency, less sludge generation, and lower energy requirements for aeration.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Hanxiao Bian, Zhiping Zhu, Qianwen Sui, Shunli Wang
Summary: The study utilized a pilot-scale continuous flow MBR to start up the partial nitrosation process, finding that the online automatic backwash operation mode was beneficial in alleviating membrane fouling. It also highlighted the critical role of increased FA concentration in membrane fouling by affecting EPS and SCOD levels.
Article
Engineering, Environmental
Jiao Chen, Kuichang Zuo, Bing Li, Jiahui Hu, Wenbao Liu, Dongsheng Xia, Lin Lin, Jiajin Liang, Xiao-yan Li
Summary: This study demonstrates the high performance of a freestanding fungal hypha activated carbon pad (FhACPad) electrode for capacitive deionization (CDI) process, exhibiting high electrical conductivity and rapid ion transport properties. Compared to conventional powdered activated carbon (PAC) electrodes, FhACPad shows higher salt adsorption capacity and desalination rate under similar desalination conditions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Jiao Chen, Kuichang Zuo, Yilin Li, Xiaochuan Huang, Jiahui Hu, Ying Yang, Weipeng Wang, Long Chen, Amit Jain, Rafael Verduzco, Xiaoyan Li, Qilin Li
Summary: This study demonstrates the selective removal of nitrate (NO3-) in an electrosorption process using a thin, porous carbonized eggshell membrane (CESM). The CESM exhibits high selectivity for NO3- over other ions and achieves a significantly higher NO3-/Cl- selectivity compared to activated carbon electrodes. This high selectivity leads to a reduction in energy consumption for nitrate removal.
Article
Materials Science, Multidisciplinary
Eva Gil, Xiaochuan Huang, Kuichang Zuo, Jun Kim, Susana Rincon, Jose Maria Rivera, Kiarash Ranjbari, Francois Perreault, Pedro Alvarez, Alejandro Zepeda, Qilin Li
Summary: In this study, a modified ultrafiltration membrane using metal-organic frameworks (MOFs) showed significantly improved water permeability and resistance to natural organic matter (NOM) fouling without sacrificing membrane selectivity. The modification involved incorporating a water-stable nanocrystalline MOF-Co into the membrane. This research highlights the potential of MOFs as excellent additives for enhancing membrane performance.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Environmental Sciences
Tianyi Zhao, Yu Yan, Bian Zhou, Xuezhen Zhong, Xiaoyu Hu, Lijia Zhang, Peng Huo, Kang Xiao, Yuanxun Zhang, Yang Zhang
Summary: This study investigated the interaction between Water-Soluble Organic Compounds (WSOCs) and Transition Metals (TMs) and its impact on Reactive Oxygen Species (ROS) generation. The results showed that the interaction between WSOCs and TMs significantly affected ROS generation, with the organic compound SRFA exhibiting a stronger ability to complex with TMs and facilitate ROS generation.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Environmental Sciences
Jinbin Han, Xiang Qi, Peng Liang
Summary: Excess nitrate in water is a challenge for ecosystem and human health. This study used bovine serum albumin (BSA) as a supplementary material to improve the rate of sulfur autotrophic denitrification. The experiment showed that a larger amount of BSA significantly increased the denitrification rate. In a packed bed reactor, sulfur particles with 1% BSA had a faster start-up and better denitrification performance compared to the control group.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Chemical
Yunfei He, Danyang Li, Kuichang Zuo, Fan Yang, Tie Gao, Peng Liang
Summary: This study developed a customized dual-chamber electrochemical reactor to recover phosphorus (P) from wastewater. The P removal efficiency of the dual-chamber reactor was 2.2 times higher than that of the single-chamber reactor. The purity of the generated vivianite reached 98.3% as confirmed by EDS analysis. High P concentration, moderate pH, and adequate current density were found to be conducive to vivianite production.
Review
Engineering, Environmental
Na Chu, Yong Jiang, Qinjun Liang, Panpan Liu, Donglin Wang, Xueming Chen, Daping Li, Peng Liang, Raymond Jianxiong Zeng, Yifeng Zhang
Summary: This paper summarizes the advances in electricity-driven microbial metabolism for resource recovery from wastewater and industrial discharges. It discusses the design of electrocatalysts, microbes, and hybrid systems, as well as quantitative comparisons and critical discussions on electrocatalyst-assisted microbial electrosynthesis. The paper also systematically reviews nitrogen recovery processes and discusses the synchronous metabolism of carbon and nitrogen using hybrid inorganic-biological systems, providing valuable insights for future trends in this field.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yuyi Gu, Xiang Qi, Xufei Yang, Yong Jiang, Panpan Liu, Xiangchun Quan, Peng Liang
Summary: Microbial extracellular electron transfer (EET) is crucial for bioenergy production and wastewater resource recovery. This review summarizes the conductivity of nanowires, biofilms, and granular sludge, and discusses the factors that affect conductivity difference in detail. The high conductivity of nanowires does not necessarily result in efficient EET in microbial aggregates due to non-conductive substances and contact resistance. Improving the conductivity measurement of microbial aggregates is important for calculating EET flux and comparing it with mass transfer coefficients.
Article
Engineering, Environmental
Yifan Gao, Shuai Liang, Quanbiao Zhang, Kunpeng Wang, Peng Liang, Xia Huang
Summary: The interaction between anodic and cathodic reactions in electrocatalytic membrane filtration (EMF) systems has great versatility in meeting complex water treatment requirements. However, current studies mostly focus on half-cell reactions with a single electrocatalytic membrane, limiting the research progress of EMF technology. In this study, a coupling strategy was developed to achieve ultra-efficient degradation performance and regulable reaction mechanisms through the interaction of anodic and cathodic reactions. A six configurations of electrocatalytic dual-membrane filtration (EDMF) system were established and systematically investigated. Based on the results, a regulation strategy for flexible tuning of direct non-radical oxidation and indirect oxidation was proposed. The findings demonstrate the versatility and tunability of the reaction mechanism and performance of the EDMF system, laying a foundation for future development of ultra-efficient and mechanism-adjustable electrocatalysis technologies.
Article
Engineering, Environmental
Jinlan Yu, Kang Xiao, Hao Xu, Yitong Li, Qiao Xue, Wenchao Xue, Aiqian Zhang, Xianghua Wen, Guoren Xu, Xia Huang
Summary: This study utilized spectroscopic fingerprinting techniques to explore the characteristics of EPS and revealed the interactions between chemical composition and wavelength-specific fluorescence responses. The differences in primary, secondary, and tertiary structures across the EPS layers were confirmed by various spectroscopic methods.
Article
Engineering, Environmental
Xi Luo, Ao Li, Xue Xia, Peng Liang, Xia Huang
Summary: H2O2 was produced efficiently in microbial reverse-electrodialysis cells (MRCs) coupled with thermolytic solutions, using carbon black (CB) as the catalyst. The optimum CB loading was found to be 10 mg/cm(2) and the optimum number of cell pairs was three, resulting in a high H2O2 production rate of 0.99 +/- 0.10 mmol/(L.h), with a 52 +/- 2% H2O2 recovery efficiency and a maximum power density of 780 +/- 37 mW/m(2). Increasing the number of cell pairs to five increased the maximum power density, but had limited effects on H2O2 production. These findings highlight the efficiency of MRCs in sustainable H2O2 production.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2023)
Review
Nanoscience & Nanotechnology
Kuichang Zuo, Sergi Garcia-Segura, Gabriel A. Cerron-Calle, Feng-Yang Chen, Xiaoyin Tian, Xiaoxiong Wang, Xiaochuan Huang, Haotian Wang, Pedro J. J. Alvarez, Jun Lou, Menachem Elimelech, Qilin Li
Summary: Electrified processes provide a chemical-free solution for removing a wide range of contaminants from water, including those difficult to treat using conventional methods. This review presents the principles of several electrified water treatment processes and emphasizes the importance of electrode materials in contaminant transport and transformation.
NATURE REVIEWS MATERIALS
(2023)
Article
Agriculture, Dairy & Animal Science
Xueying Guo, Libin Zhang, Kang Xiao
Summary: In this study, the effect of two kisspeptin-type neuropeptides (KPs) on locomotor behavior in sea cucumbers was investigated. The results showed that AjK1 significantly reduced stride length and movement duration, leading to a decrease in movement distance, while AjK2 had little inhibitory effect at the same dose. Furthermore, the levels of certain molecules in the longitudinal muscle of sea cucumbers treated with AjK1 differed significantly from the control group, which may explain the observed changes in locomotor behavior. These findings suggest that AjK1 is more likely to play a role in the regulation of sea cucumber locomotion compared to AjK2.
Article
Environmental Sciences
Xiang Qi, Jinbin Han, Ziwei Kou, Peng Liang
Summary: This study demonstrates that the use of supplementary sulfide in S0 autotrophic denitrification (SAD) can greatly enhance the denitrification efficiency and accelerate the start-up of reactors. Additionally, the application of sulfide promotes the development of biofilm, enabling the reactor to better adapt to low temperature conditions and maintain a high denitrification capacity.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Biophysics
Xinning Liu, Xiang Qi, Yuyi Gu, Xia Huang, Peng Liang
Summary: As frequent water ecological pollution caused by toxicant leakage becomes more serious, early-warning for toxicity presented in water environment has attracted increasing attention. This study employed titanium mesh (TiM) to construct an electrochemically active biofilm (EAB) sensor, which significantly improved the sensor's sensitivity for low-concentration toxicity warning. The effects of mesh size and operation mode on the sensor's sensitivity were further investigated.
BIOSENSORS & BIOELECTRONICS
(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.
