Article
Engineering, Environmental
Yoshifumi Nakazawa, Taketo Abe, Yoshihiko Matsui, Nobutaka Shirasaki, Taku Matsushita
Summary: Although superfine powdered activated carbon is not commonly used in conventional water treatment processes, such as coagulation-flocculation, sedimentation, and sand filtration (CSF), due to concerns about residual carbon particles in treated water, this study found that fine carbon particles lacking in charge neutralization can still be left behind in the sand filtrate after CSF treatment. The reduction of stray carbon particles should be a performance goal of the CSF treatment, and the concentration of residual carbon particles in the sand filtrate was influenced by the residence time distributions in the coagulation and flocculation reactors. Different types of coagulants also had varying effects on the concentration of stray and residual carbon particles.
Article
Chemistry, Analytical
Hanan H. Youssef, Sherif A. Younis, Esraa M. El-Fawal, Hager R. Ali, Yasser M. Moustafa, Gehad G. Mohamed
Summary: This study investigates the potential synthesis of cost-effective PACl coagulant from waste household aluminum foil for treating petroleum wastewater. The results demonstrate that the prepared PACl has good thermal stability and high efficiency in removing pollutants, making it suitable for wastewater treatment at different salinity levels.
Article
Engineering, Environmental
Jinsuo Lu, Xiaojiang Huang, Zhiqiang Zhang, Heliang Pang, Kunyu Chen, Haozhe Xia, Yiyu Sui, Rongwen Chen, Ziang Zhao
Summary: A novel process called MNBs-coagulation was developed to enhance drinking water treatment by using the interaction of MNBs and coagulation. The results showed that MNBs-coagulation could significantly improve the removal efficiency of humic acid and had strong anti-interference ability.
Article
Materials Science, Multidisciplinary
R. Santos-Guemes, L. Capolungo, J. Segurado, J. LLorca
Summary: Dislocation dynamics simulations were used to determine the critical resolved shear stress of an Al 4 wt. % Cu alloy containing theta'' precipitates, with results in good agreement with experimental data. The optimal strength of the alloy was found to be achieved with a homogeneous distribution of theta'' precipitates at an average size transitional between shearing and looping. Overall, the strategy presented in this study provides quantitative predictions of precipitate strengthening in metallic alloys.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
Christian Edtmaier, Maximilian Wolf, Raquel de Oro Calderon, Wolf-Dieter Schubert
Summary: Cuboidal and coherent precipitates in ternary cobalt-aluminium-tungsten systems enhance high temperature toughness of superalloys, while precipitation hardening of cobalt binder in cemented carbides shows potential for increasing hardness and wear resistance.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Environmental Sciences
Bolormaa Bayarkhuu, Jeehye Byun
Summary: This study investigates the behavior of nano- and microplastics in coagulation and sedimentation processes using a simple turbidity measurement. The findings suggest that turbidity measurement can provide a rational optimization of water treatment processes for effective removal of nano- and microplastics, offering important practical implications and application value.
Article
Materials Science, Multidisciplinary
Mingjun Yang, Andrey Orekhov, Zhi-Yi Hu, Man Feng, Shenbao Jin, Gang Sha, Kai Li, Vahid Samaee, Min Song, Yong Du, Gustaaf Van Tendeloo, Dominique Schryvers
Summary: In-situ TEM experiments revealed that coherent beta'' precipitates in Al alloys are sheared into small fragments by dislocations, while semi-coherent beta' precipitates are more difficult to be fragmented and can maintain their shape after tensile deformation.
Article
Engineering, Chemical
Beibei Liu, Baoyu Gao, Kangying Guo, Jingwen Pan, Qinyan Yue
Summary: In this study, a series of novel polyaluminum-titanium chloride (PATC) coagulants were prepared and the effects of Al (III)-Ti (IV) interaction on chemical species distribution, physicochemical properties, and coagulation efficiencies were investigated. The results revealed that PATCs exhibited higher charge densities and larger molecular weights, leading to excellent coagulation efficiencies.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Environmental Sciences
Kanika Saxena, Urmila Brighu, Aditya Choudhary
Summary: The study investigates the impact of NOM on the coagulation process, modifying a performance model for hydraulic flocculators and testing it on a sludge blanket clarifier. The interactions between humic acid and kaolin were found to significantly affect turbidity removal efficiency in the coagulation process.
Article
Engineering, Environmental
Jamila El Gaayda, Fatima Ezzahra Titchou, Issam Barra, Ilham Karmal, Hanane Afanga, Hicham Zazou, Pow-Seng Yap, Zurina Zainal Abidin, Mohamed Hamdani, Rachid Ait Akbour
Summary: This study evaluated the efficiency of Moringa oleifera seed powder (MOSP) as a natural coagulant for removing turbidity and anionic dye from synthetic wastewater. The results showed that MOSP had a high removal efficiency for both turbidity and dye, and could be considered as an alternative to chemical coagulants due to its environmental friendliness.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Benedict Terkula Iber, Donald Torsabo, Che Engku Noramalina Che Engku Chik, Fachrul Wahab, Siti Rozaimah Sheikh Abdullah, Hassimi Abu Hasan, Nor Azman Kasan
Summary: In this study, dry legs of giant freshwater prawn were chemically processed into chitin and chitosan for use as coagulant in the coagulation/flocculation of real aquaculture wastewater. The optimum operating conditions of chitosan dosage, pH, and settling time for removal of turbidity and colour were established using response surface methodology. The results showed that the smooth and none porous chitosan with high solubility and degree of deacetylation exhibited great potential as a good coagulant.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Inorganic & Nuclear
Yoshitaka Kasamatsu, Masahiro Nagase, Hidemi Ninomiya, Eisuke Watanabe, Yudai Shigekawa, Narumi Kondo, Koichi Takamiya, Tsutomu Ohtsuki, Naoya Shiohara, Atsushi Shinohara
Summary: New chemical studies on heavy elements involved investigating coprecipitation behaviors with samarium hydroxide for various elements, and recent experiments using multitracer from neutron-induced fission of U-235 provided new data for Sr, Ru, I, Pm, and Np. The results reinforce the idea that hydroxide precipitation properties of various elements can be qualitatively investigated through their coprecipitation behaviors.
APPLIED RADIATION AND ISOTOPES
(2022)
Article
Agricultural Engineering
Heri Septya Kusuma, Andrew Nosakhare Amenaghawon, Handoko Darmokoesoemo, Yantus A. B. Neolaka, Bernadeta Ayu Widyaningrum, Samuel Usiwo Onowise, Chinedu L. Anyalewechi
Summary: In this study, the effectiveness of Manihot esculenta extract as an ecofriendly coagulant for treating turbid wastewater was evaluated. The coagulant was characterized chemically and morphologically, and the coagulation process was modeled using response surface methodology (RSM) and artificial neural networks (ANN). The results showed that the coagulant had diverse functional groups, a porous structure, and carbon and oxygen were the major constituents. RSM and ANN both predicted similar maximum turbidity removal under optimized conditions. This suggests that Manihot esculenta extract could be a suitable coagulant for the remediation of turbid wastewater.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Engineering, Environmental
Setyo Budi Kurniawan, Siti Rozaimah Sheikh Abdullah, Ahmad Razi Othman, Ipung Fitri Purwanti, Muhammad Fauzul Imron, Nur'Izzati Ismail, Azmi Ahmad, Hassimi Abu Hasan
Summary: This study isolated the WS5 strain from aquaculture effluent, which showed potential as a bioflocculant agent for turbidity removal in water. Experimental results indicated that WS5 exhibited better flocculation activity in high turbid water, possibly due to effective flocculation process through polymer bridging.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Environmental
H. N. P. Dayarathne, Michael J. Angove, Sanghyun Jeong, Rupak Aryal, Shukra Raj Paudel, Bandita Mainali
Summary: Temperature plays a critical role in turbidity removal by coagulation. The appropriate coagulant dosage is proportional to pH and temperature. Temperature significantly affects turbidity removal efficiency, which is also influenced by coagulant solubility and sludge recirculation.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Jinqiang Wang, Nigel Graham, Kai Sun, Liping Wen, Wenzheng Yu
Summary: The development of a PET membrane with multiple biomimetic nanochannels for the detection of fluoride and chromium (III) ions is described. The membrane was created using an asymmetric chemical etching technique and was modified with specific recognition compounds for F- and Cr3+. The method showed excellent linear relationships between current values and ion concentrations, with low detection limits of 4.10 nM for Cr3+ and 0.46 nM for F-. The accuracy and reliability of the method were compared to conventional ICP-MS analysis and showed good agreement, demonstrating its potential application for detecting a wide range of ionic contaminants.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Environmental
Kai Zhang, Yuanxiao Duan, Nigel Graham, Wenzheng Yu
Summary: The electrochemical chlorination of urea to CO2 and N-2 end-products, via active-chlorine-mediated oxidation under nearly neutral conditions, is an effective treatment for medium-concentrated urea-containing wastewater. A novel flow reactor integrated with three-dimensional hierarchically porous Ru/RuO2 architectures anchored on a Ti mesh was designed. The hierarchically macroporous electrode can create sufficient exposure of catalytically active sites and facilitate the microscopic mass transport and diffusion inside the active layer, thereby contributing to the increased removal efficiency of urea-N and ammonia-N.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Agricultural Engineering
T. Somorin, L. C. Campos, J. R. Kinobe, R. N. Kulabako, O. O. D. Afolabi
Summary: Though the quantity of organic-rich agri-food waste from open-air markets in sub-Saharan Africa cities like Kampala, Uganda is uncertain, the current methods of handling them, such as open burning and unsanitary landfilling, are unsustainable and inefficient. This study used waste-to-energy process modeling, material flow analysis, and life cycle assessment to evaluate the bioenergy production, material recycling, and environmental impacts of the waste in Kampala City. The results showed that integrated hydrothermal carbonisation and anaerobic digestion performed the best in terms of reducing environmental impacts and recovering energy and resources.
BIOMASS & BIOENERGY
(2023)
Article
Engineering, Environmental
Yilin Dong, Dongyu Xu, Jie Zhang, Qiuwen Wang, Shaoxuan Pang, Guangming Zhang, Luiza C. Campos, Longyi Lv, Xiaoyang Liu, Wenfang Gao, Li Sun, Zhijun Ren, Pengfei Wang
Summary: Intimately coupled photocatalysis and biodegradation (ICPB) is a promising technology for efficient degradation of bio-recalcitrant pollutants. This article presents a cooperative degradation scheme using B-doped Bi3O4Cl as the photocatalyst for the degradation and mineralization of ciprofloxacin (CIP) in ICPB. The results show a high removal rate of around 95% after 40 days, with the biofilms inside the ICPB carriers playing a critical role in mineralizing the photocatalytic products and improving the removal rate of total organic carbon (TOC) by over 20%. The study also reveals the resilience of the biofilms to CIP and photocatalysis, and their ability to adapt and reconstruct microbial communities using energy from light-excited photoelectrons.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Ikechukwu Offie, Farzad Piadeh, Kourosh Behzadian, Luiza C. Campos, Rokiah Yaman
Summary: This paper presents an artificial intelligence-based framework for predicting and optimizing biogas generated from a micro-AD plant. The framework improves biogas production efficiency and identifies the optimal feeding pattern. Results demonstrate increased biogas productivity and reduced operational costs.
Review
Green & Sustainable Science & Technology
Aamina Shah, Komali Kantamaneni, Shirish Ravan, Luiza C. Campos
Summary: The use of Earth observation technology in water, sanitation, and hygiene services during disaster response and recovery is an under-researched area. Three main common uses of Earth observation technology were identified: monitoring surface water quality, groundwater sensing, and mapping and monitoring of hazards and infrastructure. However, more research is needed, and there are limitations such as funding, communication, and regulations.
Article
Nanoscience & Nanotechnology
Kai Zhang, Fengchen Guo, Nigel Graham, Wenzheng Yu
Summary: Constructing desired morphology and nanointerface is an effective approach to enhance urea splitting for hydrogen generation. In this study, a nickel/tungsten oxide Mott-Schottky heterojunction electrocatalyst with a hedgehog-like structure was fabricated for alkaline urea splitting. The Mott-Schottky nanointerfaces between nickel and tungsten oxide domains were observed, which accelerated charge transfer rate. The optimal electrode exhibited outstanding catalytic activity and reduced cell voltage when coupled with urea oxidation reaction.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Environmental
Muhammad Saboor Siddique, Qingyun Song, Xuejun Xiong, Hasan Fareed, Nigel Graham, Wenzheng Yu
Summary: The integration of pre-treatment methods with low pressure-driven ultrafiltration has been proven effective in reducing disinfection by-products in drinking water. In this study, a low dose peroxone assisted alkaline hydrolyzed polyacrylonitrile UF-membrane system was explored for its efficiency in removing dissolved organic matter and regulated DBPs. The HPAN membrane displayed high flux recovery and comparable removal efficiency to the NF-3 membrane. Additionally, the H2O2/O3-HPAN system significantly reduced the aromatic and fluorescent content of the DOM and removed a high percentage of THMs, HAAs, and DBPs formation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Jinqiang Wang, Zhaoyang Su, Nigel J. D. Graham, Hongkai Liu, Kai Sun, Wenzheng Yu
Summary: This paper focuses on the functionalization of double positively charged polyethylenimine (PEI)/Zr4+-polyamide (PA) nanofiltration (NF) membrane. The study evaluates the properties and performance of prepared PEI/Zr4+-PA NF membrane in removing aquatic contaminants and its antifouling ability. Results show that loading Zr4+ improves the hydrophilicity and removal behavior of the membrane when exposed to high concentrations of contaminants. The effectiveness of the membrane is not affected by factors such as high filtering degree and filtration cycle, and antifouling ability can be further improved by continuously loading Zr4+.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Lei Xu, Shian Song, Nigel J. D. Graham, Wenzheng Yu
Summary: This study investigates the interaction between O3 and amorphous alum flocs formed during flocculation at neutral pH using a conventional coagulant (alum). It was found that O3 promotes the transition of the in-situ formed alum flocs from tetrahedral Al to octahedral Al structures, facilitating the crystallization process. The involvement of surface functional groups of amorphous Al flocs in O3 catalytic oxidation enhances the performance of the subsequent dual-membrane filtration process in terms of fouling alleviation and effluent quality improvement.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Bingqian Yang, Sajid Rashid, Nigel Graham, Wenzheng Yu
Summary: This study investigates the impact of small organic molecules (SOM) on Fe(II) coagulation and reveals that they can significantly change the coagulation behavior by forming particles with distinct nanostructures. The study also demonstrates that SOM can directly influence the structure of flocs by controlling the oxidation rate of Fe(II) and indirectly interfere with the charge transfer between flocs and free Fe(II).
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Environmental
Mengjie Liu, Nigel Graham, Lei Xu, Kai Zhang, Wenzheng Yu
Summary: Drinking water supply in rural areas is a challenging issue, and low-cost, efficient water treatment processes are needed to provide safe and affordable drinking water. This study proposes and evaluates a bubbleless aeration BAC (ABAC) process with a hollow fiber membrane (HFM) assembly, which improves dissolved oxygen (DO) throughout the filter and enhances DOM removal efficiency. Results show that ABAC significantly increases DOC removal and decreases disinfection byproduct formation compared to a comparable filter without aeration. The proposed ABAC treatment, with its various advantages, is well-suited for decentralized drinking water systems in rural areas.
Article
Engineering, Environmental
Qingyun Song, Bingqian Yang, Mengjie Liu, Shian Song, Nigel Graham, Wenzheng Yu
Summary: It was found that aging resulted in increasing crystallization of the flocs, which can play a beneficial role in activating persulfate oxidant to remove the representative organics. Furthermore, acidification was also found to further improve the removal of low MW natural organics and tetracycline. These results show that aged flocs have a high potential of reuse for re-coagulation and activation of oxidants to enhance drinking water quality.
Article
Environmental Sciences
Tahira Aslam, Safdar A. Mirza, Aneeba Rashid, Muhammad Arshad Javed, Luiza C. Campos
Summary: This study aimed to use domestic wastewater (DWW) for the irrigation of two rice cultivars after treatment with the bacterial strain Alcaligenes faecalis MT477813 under a hydroponic culture system. The results showed that the biotreatment of DWW with the bacterial isolate achieved more than 90% decolourisation and a reduction in contaminants. The growth of rice plants grown in treated DWW was significantly higher than those grown in untreated DWW, indicating the bioremediation efficiency of the bacterial isolate and the utility of DWW for rice crop irrigation.
Review
Green & Sustainable Science & Technology
Fatemeh Asghari, Farzad Piadeh, Daniel Egyir, Hossein Yousefi, Joseph P. Rizzuto, Luiza C. Campos, Kourosh Behzadian
Summary: Urban water infrastructure (UWI) consists of water supply systems, urban drainage/stormwater systems, and wastewater systems. This study critically reviews the approaches and strategies for resilience assessment in UWI and identifies three key areas for analysing resilience: system design, resilience concepts development, and implementation of green infrastructure. The results highlight the macroeconomic significance of UWI and suggest the need for comprehensive and sustainability-based indicators in future research.
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.