Article
Environmental Sciences
Lanhe Zhang, Lu Wang, Yuning Zhang, Da Wang, Jingbo Guo, Mingshuang Zhang, Yiran Li
Summary: The electrode ultrafiltration membrane bioreactor (EMBR) showed better performance and membrane fouling characteristics in treating cosmetics wastewater, with increased COD removal efficiency and reduced transmembrane pressure compared to the conventional ultrafiltration membrane bioreactor (UMBR). The electrode ultrafiltration membrane had a higher energy barrier with pollutants, contributing to its strong anti-fouling property.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Yongsun Jang, Han-Shin Kim, So-Young Ham, Jeong-Hoon Park, Hee-Deung Park
Summary: Membrane bioreactors (MBRs) are considered a promising tool for resource recovery in wastewater treatment, however, membrane fouling is inevitable and deteriorates MBR performance. This study found that an increase in total soluble microbial product (SMP) and extracted extracellular polymeric substance (eEPS) concentration leads to early TMP jumps and low fouling rates.
Article
Chemistry, Physical
Raquel Martinez, Maria Olga Ruiz, Ana Garcia, Cipriano Ramos, Victorino Diez
Summary: The study presented the characterization of anaerobic sludge-derived extracellular polymeric substances (EPS) under different extraction conditions and their impact on fouling in submerged hollow fibre membranes. Ultrasonication proved to be more effective in achieving higher EPS extraction yields in a shorter time compared to vortex agitation, with temperature increase and NaCl concentration decrease favoring EPS diffusion. The combination of ultrasonication time and solvent salinity showed statistically significant effects on ultrasonication-assisted EPS extraction.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Engineering, Environmental
Yu-Xiang Lu, Heyang Yuan, Hameer Chand, You Wu, Yu-Li Yang, Heng Liang, Hai-Liang Song
Summary: Osmotic membrane bioreactors (OMBRs) are considered suitable for treating wastewater containing tetracycline, but the impact of membrane fouling layer on tetracycline filtration and its relationship with microbial activity is still unclear. This study investigated the effects of draw solute concentration and type on the formation of a membrane fouling layer for tetracycline filtration and found that the fouling layer played an important role in tetracycline filtration and degradation. The study provided insights into the combined effect of membrane fouling and microorganisms on tetracycline removal.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Phuc-Nguon Hong, Norihisa Matsuura, Mana Noguchi, Ryoko Yamamoto-Ikemoto, Ryo Honda
Summary: This study investigated the effects of vanillin on extracellular polymeric substances (EPS) and microbial community in an MBR. The results showed that vanillin remarkably reduced membrane fouling by inhibiting the production of viscous EPS and hydrophobic lipopolysaccharides. This interference to microbial activity effectively mitigated biofouling in the MBR.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Cheng-Cheng Ji, Ke-Yu Chen, Shao-Kang Deng, Jian-Xiao Wang, Yun-Xia Hu, Xin-Hua Xu, Li-Hua Cheng
Summary: In this study, the fouling behaviors of Chlorella vulgaris and Scenedesmus obliquus in forward osmosis membrane filtration process were compared, and the roles of soluble-extracellular polymeric substances (sEPS) and bound-EPS (bEPS) in fouling performance were investigated. The results showed that bEPS played a crucial role in fouling, and the severe fouling performance was consistent with the proper ratio of carbohydrates and proteins in the cake layer, as well as higher low molecular weight (LMW) components. The study revealed the fundamental mechanism of FO membrane fouling caused by real microalgal suspension and improved understanding of evolutionary fouling performances of algal EPS.
Article
Engineering, Environmental
Liven Wenhui Lee, Xianzheng Zhu, Ziwei Liu, Yue Gao, Cheng Chen, Xia Huang
Summary: Anaerobic osmotic membrane bioreactors (AnOMBRs) using thin film composite (TFC) forward osmosis (FO) membranes demonstrated decline in water flux due to membrane fouling and salt accumulation, with extracellular polymeric substances (EPS) primarily composed of polysaccharides contributing to the fouling. Results also showed high rejection rates of organic contaminants and the coexistence of biofouling and organic fouling on the membrane surface.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Lingfeng Ni, Qin Shi, Min Wu, Jie Ma, Yayi Wang
Summary: Although hydrophilic membrane showed higher flux and shorter filtration cycle, it also resulted in higher filtration resistance and increased rejection of microbial metabolites, leading to changes in membrane fouling and microbial community structure in anammox MBR.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Environmental Sciences
Bei Jiang, Qianzhi Zeng, Yuan Hou, Hongxin Li, Shengnan Shi, Zhaobo Chen, Yubo Cui, Dongxue Hu, Hui Ge, Shun Che, Yanan Sui, Yu Qi
Summary: Hydrogen peroxide (H2O2) is being considered as a potential alternative to chlorine for controlling biofouling in membrane bioreactors (MBRs), however its use may lead to inhibition of key enzymes, decreased degradation efficiency, and increased cell damage for microorganisms, especially during membrane cleaning processes. Extracellular polymeric substances (EPS) were found to moderate the adverse impacts on microbes by inhibiting key enzyme activity, reducing phenol degradation efficiency, and enhancing cell damage with H2O2 concentration increased.EPS also protected microorganisms by sacrificial reaction with H2O2, as indicated by spectroscopic characterization.
ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Environmental
Zhihao Niu, Huizhen Guo, Yun Zhou, Siqing Xia
Summary: The study showed that as the hydraulic retention time (HRT) decreased, the biodegradation of chemical oxygen demand and total nitrogen in wastewater decreased, while membrane resistance increased, leading to an accelerated membrane fouling process.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Zhihao Niu, Huizhen Guo, Yun Zhou, Siqing Xia
Summary: The study found that as the hydraulic retention time decreased, the performance of membrane bioreactors in treating ADPW declined, membrane fouling intensified, protein and polysaccharide concentrations increased, and membrane pollution worsened.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Chemical
Hau-Ming Chang, Shiao-Shing Chen, Wen-Shing Chang, Thi Xuan Quynh Nguyen, Nguyen Cong Nguyen
Summary: The designed dynamic osmotic membrane bioreactor (DR-OMBR) with low-speed rolling motion and cross-flow velocity effectively alleviated membrane fouling, resulting in stable water flux and high removal efficiency.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Gen-Qiang Chen, Yin-Hu Wu, Zhuo Chen, Li-Wei Luo, Yun-Hong Wang, Xing Tong, Yuan Bai, Hao-Bin Wang, Yu-Qing Xu, Zi-Wei Zhang, Nozomu Ikuno, Hong-Ying Hu
Summary: Disinfection treatment increased the abundance of typical bacterial genus with high EPS production ability, leading to significantly enhanced EPS volumetric productivity. EPS produced by DRB showed higher fouling potential on UF and RO membranes, with increased molecular weight and fluorescence intensity. The XDLVO theory revealed that EPS of DRB had significantly higher interaction energy with membranes than control group, indicating caution should be taken when using oxidizing disinfection as pre-treatment for membrane filtration in wastewater reclamation.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Environmental
Hugo G. Lemos, Rodrigo Almeria Ragio, Ana Carolina Santana Conceicao, Everaldo C. Venancio, Jose Carlos Mierzwa, Eduardo Lucas Subtil
Summary: Membrane bioreactors have shown potential for co-treatment of landfill leachate and wastewater, but the high fouling potential of membranes remains a challenge. Incorporating hydrophilic nanostructures like graphene oxide in polymeric membranes can help mitigate fouling. While PES-GO membranes exhibited superior rejection and antifouling properties in lab tests, they showed similar organic removal performance to PES membranes during actual operation.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Biotechnology & Applied Microbiology
Hua-Jun Feng, Long Chen, Xian-Bin Ying, Sheng-Song Yu, Yang-Cheng Ding
Summary: The effects of PAC with different redox properties on membrane fouling were investigated, and it was found that PAC with reductive properties could prolong the filtration cycle and enhance the anti-fouling performance mainly by reducing the content of extracellular polymer substances and soluble microbial products in the solution.
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Siyi Xu, Yue Han, Cheng Zhou, Jianxi Li, Liguo Shen, Hongjun Lin
Summary: A new biobased flame retardant (MHPA) was synthesized by neutralizing magnesium hydroxide (MH) with phytic acid (PA). Adding MHPA to ethylene vinyl acetate (EVA) significantly improved the fire retardancy, smoke suppression, and mechanical properties of the composites. The combination of MHPA and MH exhibited excellent carbonization and expansion effects, contributing to the improved flame retardancy.
CHINESE CHEMICAL LETTERS
(2023)
Article
Chemistry, Physical
Mengying Qian, Fangyu Zhuo, Yu Li, Penghui Yi, Yubei Gao, Weilu Zhou, Yanlong Sun, Jianrong Chen
Summary: In this study, a novel electro-Fenton system using Fe-N-C catalyst supported on carbon felt as the cathodic catalyst and air as the oxygen source was developed. The CF/Fe-N-C catalyst exhibited high efficiency in the degradation and mineralization of antibiotics in aqueous solution. It also demonstrated outstanding reusability and stability, and could be used for the in-situ fabrication of reticular nanostructure.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Environmental
Mengfei Wu, Meijia Zhang, Liguo Shen, Xinhua Wang, Deng Ying, Hongjun Lin, Renjie Li, Yanchao Xu, Huachang Hong
Summary: This study compared the fouling behaviors of a membrane bioreactor (MBR) operated at normal and sludge bulking stages, and explored the different mechanisms behind these behaviors. The results showed that the MBR could be stably operated for about 60 days without membrane cleaning in the normal stage, while daily membrane cleaning was required in the sludge bulking stage. Further characterizations revealed that the bulking sludge had lower dewaterability, smaller particle size, higher fractal dimension, higher viscosity, abundant filamentous bacteria, and different types of extracellular polymer substances (EPS). It was suggested that microbial community transition was responsible for the occurrence of sludge bulking, which in turn affected membrane fouling. Based on these findings, it was proposed that providing extra force to offset a chemical potential gap caused by foulant layer structure transition during sludge bulking is necessary to sustain filtration and prevent extremely high specific filtration resistance (SFR).
Article
Engineering, Environmental
Lingya Fei, Cheng Chen, Liguo Shen, Yuyao Zhang, Boya Wang, Jiujing Xu, Bisheng Li, Saleem Raza, Hongjun Lin
Summary: A facile approach using graphene oxide (GO) as a 2D nano-surfactant to assist the dispersion and assembly of superhydrophilic amino acid-based Zr-MOF microcrystals into a bulge-structured membrane is reported. The resulting GO/MIP-202(Zr) membrane with 2D/3D hybrid nanochannels and enhanced hydrophilicity showed superior water permeance and antifouling performance, making it promising for water treatment applications.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Chemistry, Inorganic & Nuclear
Shuning Yu, Junjie Chen, Cheng Chen, Mingzhu Zhou, Liguo Shen, Bisheng Li, Hongjun Lin
Summary: Graphdiyne (GDY) is a rising-star two-dimensional carbon allotrope that has been widely used in the field of electro-chemistry due to its unique properties. However, the pure GDY does not achieve optimum performance. The doping of heteroatoms into GDY can regulate its electronic structure and improve its performance. In this review, the preparation methods and various doping elements of heteroatom-doped GDY are introduced, and the electrochemical applications in energy conversion and storage are summarized. The challenges and opportunities of heteroatom-doped GDY are also discussed.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Environmental Sciences
Yansha Zeng, Zhe Wang, Zhenxiang Pan, Liguo Shen, Jiaheng Teng, Hongjun Lin, Jianzhen Zhang
Summary: This study investigated the combined effects of polymeric aluminum chloride (PAC) and polyacrylamide (PAM) on sludge dewatering, aiming to uncover the underlying mechanisms. The co-conditioning of 15 mg g-1 PAC and 1 mg g-1 PAM achieved optimal dewatering performance, significantly reducing the specific filtration resistance (SFR) of the co-conditioned sludge. The findings provide insights into the improved dewatering performance and the thermodynamic mechanisms of sludge dewatering with different chemical conditioning.
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Physical
Jiayu Zhang, Lin Yue, Zhihao Zeng, Chunran Zhao, Linjiang Fang, Xin Hu, Hongjun Lin, Leihong Zhao, Yiming He
Summary: The photocatalytic N2 immobilization performance of NaNbO3 is enhanced via oxygen vacancy introduction and Pt loading. The Pt-loaded NaNbO3 with rich oxygen defects (Pt/O-NaNbO3) is synthesized by combining ion-exchange and photodeposition methods. The introduction of oxygen defects greatly affects the energy band structure, resulting in higher photoactivity and NH3 production rate compared to O-NaNbO3 and NaNbO3. The loaded Pt nanoparticles further increase surface charge separation, contributing to the increased photocatalytic activity.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Environmental Sciences
Song Zheng, Xiaojing Li, Jiayu Zhang, Junfeng Wang, Chunran Zhao, Xin Hu, Ying Wu, Yiming He
Summary: This paper synthesized a new type of ternary piezoelectric catalyst MoOX/ZnS/ZnO (MZZ) and studied its catalytic degradation performance of Rhodamine B solution. The results showed that the MZZ catalyst exhibited excellent piezoelectric catalytic activity due to its core-shell structure and heterojunction structure.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Engineering, Chemical
Junfeng Wang, Lifang Guan, Shude Yuan, Jiayu Zhang, Chunran Zhao, Xin Hu, Botao Teng, Ying Wu, Yiming He
Summary: This work enhances the photocatalytic N2 immobilization performance of CdMoO4 through Bi doping, which reduces the particle size and narrows the band gap. The Bi-doped CdMoO4 exhibits a stronger ability in generating and separating charge carriers than CdMoO4. N2 has stronger adsorption at the unsaturated Mo sites of Bi-doped CdMoO4 due to the interactions between the 2 pi* orbital of N2 with the d orbital of Mo, leading to excellent photocatalytic N2-to-NH3 performance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Environmental
Lei Han, Jing Ma, Hongjun Lin, Cheng Chen, Jiaheng Teng, Bisheng Li, Dieling Zhao, Yanchao Xu, Wei Yu, Liguo Shen
Summary: The recycling of wastewater with multiple pollutants is an urgent issue, and gravity-driven membrane separation with metal-organic frameworks (MOFs) as membrane modifications has shown great potential. In this study, a novel Ni-MOF membrane was prepared by synthesizing flower-like nickel-based MOF particles and assembling them on a nylon membrane. The Ni-MOF membrane exhibited superhydrophilic and underwater superoleophobic properties, and demonstrated significantly improved rejection rates for various dye solutions, oil-water emulsion, and microplastic wastewater, while maintaining long-term stability. These findings highlight the broad application prospects of Ni-MOF membranes in wastewater treatment.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Qianqian Zeng, Die Ling Zhao, Liguo Shen, Hongjun Lin, Ning Kong, Lei Han, Cheng Chen, Jiaheng Teng, Chuyang Tang, Tai-Shung Chung
Summary: This study inserted titanium oxide nanotubes into the interlayer space of 2D MXene-based membranes to prepare PMT membranes with excellent performance. The PMT membrane has outstanding hydrophilicity, high retention rates, and ultra-high permeability. It also exhibits excellent antifouling and self-cleaning properties. The incorporation of TiONT increased the interaction energy between the membrane and pollutants, thereby improving its antifouling performance. This novel 2D membrane shows great promise for large-scale continuous separations of oil/water emulsions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Ning Kong, Liguo Shen, Qianqian Zeng, Cheng Chen, Jiaheng Teng, Yanchao Xu, Leihong Zhao, Hongjun Lin
Summary: A novel approach involving the synthesis of ultra-thin MXene and ferroferric oxide doped molybdenum disulfide (FM) was developed to improve the performance of MXene membranes for oil separation. The resulting membranes showed enhanced interface hydrophilicity, increased surface roughness, and improved permeability, leading to high water flux and efficient oil separation.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Lin Yue, Jiayu Zhang, Zhihao Zeng, Chunran Zhao, Xin Hu, Leihong Zhao, Bing Zhao, Yiming He
Summary: In this study, NaNbO3 microcubes were used to construct a series of NaNbO3/Bi2O2CO3 heterojunctions with different NaNbO3 content. The photoactivity of these heterojunctions for N-2 fixation was examined, and the results showed that 7.5% NaNbO3/Bi2O2CO3 had the highest photoactivity. A comprehensive investigation on the physical and chemical properties of the NaNbO3/Bi2O2CO3 photocatalyst was conducted, and it was found that the addition of NaNbO3 did not affect the photoabsorption performance and specific surface area of Bi2O2CO3. However, the tight contact and appropriate band positions between NaNbO3 and Bi2O2CO3 resulted in the formation of a heterojunction structure, allowing efficient separation of photogenerated electrons and holes and achieving exceptional performance in the photocatalytic nitrogen fixation reaction.
Article
Materials Science, Multidisciplinary
Chunran Zhao, Xiaojing Li, Lin Yue, Xujie Ren, Shude Yuan, Zhihao Zeng, Yiming He
Summary: BiPO4/Bi4O5Br2 composites were synthesized and applied for photocatalytic N2 fixation and dye degradation for the first time. The synthesized BiPO4/Bi4O5Br2 exhibited exceptional photocatalytic performance under simulated solar light. Various techniques were employed to characterize the prepared photocatalysts, revealing the enhancement of charge separation as the primary factor affecting the photocatalytic performance.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Engineering, Chemical
Shude Yuan, Junfeng Wang, Chunran Zhao, Lin Yue, Xujie Ren, Zhihao Zeng, Xin Hu, Ying Wu, Yiming He
Summary: This study designed and synthesized a novel composite photocatalyst of Bi2O3/CdMoO4 using a deposition-oxidation method. It investigated the morphology, specific surface area, structure, optical properties, and photoelectric chemical properties of the Bi2O3/CdMoO4 composite. The results showed that the dispersion of Bi2O3 nanoparticles on the surface of CdMoO4 polymers increased light absorption and facilitated the photocatalytic reaction. The presence of a tight contact between CdMoO4 and Bi2O3 resulted in the formation of a heterojunction structure, promoting the separation efficiency of electron-hole pairs through an S-scheme mechanism.
SEPARATION AND PURIFICATION TECHNOLOGY
(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.
