Article
Environmental Sciences
Xiao-Yuan Lv, Guan-Ping Jin, Ding-Kun Yuan, Yan-Feng Ding, Peng-Xing Long
Summary: Copper hexacyanocobaltate was electro-deposited on amino-graphene-coated indium-tin-oxide glass to form a multifunctional heterogeneous catalyst, which was utilized to establish a novel heterogeneous photo-electro-Fenton-like system capable of generating hydrogen peroxide and hydroxyl radical simultaneously. The system showed high productivity of hydroxyl radicals and efficient degradation of levofloxacin in neutral media.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Environmental
Guowei Deng, Zhen Wang, Jinxing Ma, Jin Jiang, Di He, Xianhui Li, Aleksandra Szczuka, Zhong Zhang
Summary: Fenton processes can produce reactive species such as hydroxyl radical (HO·) and ferryl ion (FeIVO2+) which play important roles in oxidizing organic compounds. This study demonstrated the generation of FeIVO2+ in UV/Fe(III) and UV/Fe(III)/H2O2 systems at pH 2.8 using methyl phenyl sulfoxide (PMSO) as a probe compound. The formation of FeIVO2+ was found to occur via the oxidation of Fe(III) by HO· and the O-O homolysis of [FeIII-OOH]2+ in the photo-Fenton process.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Feng Cheng, Peng Zhou, Yang Liu, Xiaowei Huo, Jian Zhang, Yue Yuan, Heng Zhang, Bo Lai, Yongli Zhang
Summary: The study investigates the enhancement of graphene oxide (GO) on Fe(III)-mediated Fenton and photo-Fenton oxidation, confirming hydroxyl radicals (OH) as the major oxidant for chloramphenicol degradation. The formation of GO-Fe(III) complexes, the electron transfer from GO to Fe(III), and the promotion of H2O2-induced Fe(III) reduction by GO are discussed. The GO/Fe(III)/H2O2 system shows great potential for environmental remediation, with or without visible light irradiation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Physical
Jiafeng Wei, Wangqing Shen
Summary: By uniformly anchoring amorphous FeOOH quantum dots on WO3 nanoflower petals, a new photocatalyst WO3-FeOOH-X was developed for efficient degradation of MB and AR18 azo dyes. The degradation rates of WO3-FeOOH-3 were 98.69% for MB and 92.55% for AR-18 within 5 minutes. The mixed dye system (MB+AR-18) became clarified within 5 minutes.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Engineering, Environmental
Yufan Yuan, Fangling Guan, Chenglong Yu, Danping Li, Faying Lai, Huajun Huang, Jinbao He, Yanpeng Gao, Hansun Fang
Summary: Soil and sediment can naturally generate hydroxyl radicals (HO center dot) through Fenton or Fenton-like reactions, and the presence of organic ligands (OLs) can significantly enhance the generation of HO center dot. The moisture content in soil is a crucial factor for HO center dot generation. The release of Fe(II) from solid into the aqueous phase and the complexation reactions between Fe(II) and OLs contribute to the stimulation of HO center dot generation. However, certain OLs can suppress HO center dot generation by promoting other reactions. This study provides insights into how synthetic OLs affect HO center dot generation in soil and sediment, and suggests potential applications for in-situ Fenton reactions.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Chemistry, Applied
Haoran Yu, Danxu Liu, Hengyi Wang, Haishuang Yu, Qingyun Yan, Jiahui Ji, Jinlong Zhang, Mingyang Xing
Summary: In recent years, there have been numerous studies on the Fenton or Fenton-like reactions mediated by nonfree radicals such as singlet oxygen (1O2). However, there are few studies on the synergistic effect of 1O2 and free radicals on the degradation of organic molecules in the Fenton reaction. This study constructs a CoP/Fe2+/AM1.5 system and demonstrates the controllable formation of surface 1O2 and center dot OHads through the oxidation and reduction centers on the CoP surface. The synergistic effect between 1O2 and the surface-adsorbed center dot OHads leads to the degradation of phenol.
CHINESE JOURNAL OF CATALYSIS
(2022)
Article
Engineering, Environmental
Carlos Dante Gamarra-Guere, Dawany Dionisio, Gessica Oliveira Santiago Santos, Marcos Roberto Vasconcelos Lanza, Artur de Jesus Motheo
Summary: Endocrine disruptors, such as MeP, are persistent pollutants in aquatic ecosystems. Among various advanced oxidation processes, electro-Fenton was found to be the most effective method for degrading MeP efficiently and quickly, outperforming other alternatives.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Fernando Rodrigues-Silva, Maria Clara V. M. Starling, Daniel Aparecido S. Rodrigues, Camila C. Amorim
Summary: This study evaluates the performance of solar photo-Fenton for the removal of contaminants of emerging concern (CECs) from municipal secondary effluents (MSE) from Upflow Anaerobic Sludge Blanket (UASB) systems. The results show that solar photo-Fenton is effective in removing CECs and reducing toxicity to organisms.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Xiang Li, Yuli Yao, Bo Wang
Summary: Exploring efficient heterogeneous photo-Fenton catalysis is crucial for advanced water purification. In this study, a series of multivariate metal-organic framework catalysts were synthesized, and by incorporating the Fe-O cluster into the framework, the degradation rate of SMX was significantly improved. The modified material enhanced visible-light absorption and facilitated the formation of reactive oxygen species, leading to further improvement in degradation efficiency.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Maryam Behrouzeh, Mohammad Mehdi Parivazh, Elnaz Danesh, Mohammad Javad Dianat, Mohsen Abbasi, Shahriar Osfouri, Amir Rostami, Mika Sillanpaa, Mahdieh Dibaj, Mohammad Akrami
Summary: This study focuses on the treatment of organic compounds DMSO and DMAC in wastewater using advanced oxidation processes (AOPs). By studying various AOPs and analyzing the effects of operating parameters, it was concluded that the Electro-Fenton process is the most suitable method for the efficient removal of DMSO and DMAC.
ARABIAN JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
Jinsheng Wei, Xue Feng, Xuefeng Hu, Junhan Yang, Chen Yang, Baiyu Liu
Summary: In this study, Cu(II) doped FeOCl composites were synthesized and utilized for the degradation of phenol using photo-Fenton process. The doping of Cu(II) and the introduction of lattice defects on FeOCl surface significantly enhanced the degradation efficiency.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
B. Anusha, M. Anbuchezhiyan, R. Sribalan
Summary: The research showed that under pH 3 conditions, the combination of TiO2 with Fenton reagents exhibits higher photocatalytic activity in degrading nitrophenols, achieving complete degradation of all three nitrophenols.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Environmental Sciences
N. Lopez-Vinent, A. Cruz-Alcalde, J. Gimenez, S. Esplugas
Summary: Three organic fertilizers and their mixtures were tested as Fe-complexes for micropollutants degradation and E.coli inactivation, with the combination of EDDS + EDTA showing the best performance in achieving a balance between iron precipitation and rate of micropollutants removal.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Biochemistry & Molecular Biology
Zhongwei Zhao
Summary: This Mini-review summarizes the latest evidence of hydroxyl radical generation from physiologically relevant Fenton-like reactions of iron(II) complexes with physiological ligands in human blood plasma. The findings strongly challenge the previous proposal.
FREE RADICAL BIOLOGY AND MEDICINE
(2023)
Article
Engineering, Environmental
Xiang Li, Xianyi Gan
Summary: This study explores the efficient removal of pharmaceuticals and personal care products in water using Cu-doped g-C3N4 for photo-Fenton degradation. The modified g-C3N4 shows improved solar light absorption and successfully removes a variety of micropollutants.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Water Resources
Kimberly Pugel, Amy Javernick-Will, Muhammed Mussa, Lemessa Mekonta, Desta Dimtse, Martin Watsisi, Angela Huston, Karl Linden
Summary: Decentralization in many African countries has made local governments responsible for water, sanitation, and hygiene (WASH) service provision. To strengthen service provision, local governments are increasingly collaborating with internal and external stakeholders, resulting in 'collaborative approaches'. This study investigates how collaborative approaches in Ethiopia and Uganda obtained government commitment and finds that they must be seen as legitimate, align with government mandates, and demonstrate value to decision-makers.
JOURNAL OF WATER SANITATION AND HYGIENE FOR DEVELOPMENT
(2022)
Article
Development Studies
Jami Nelson-Nunez, Simon Mostafa, Rayan B. Mahoney, Karl G. Linden
Summary: This study explores the reasons for non-use of available rural water supply systems in areas with public taps with treated water, focusing on the importance of community meeting attendance for consistent use. Findings suggest that non-users are more likely to be those living further from the water source and with lower levels of education, indicating that community approaches to health interventions may be more effective for certain demographics.
JOURNAL OF DEVELOPMENT STUDIES
(2022)
Article
Engineering, Environmental
Ben Ma, Saba Seyedi, Emma Wells, David McCarthy, Nicholas Crosbie, Karl G. Linden
Summary: This study investigates the inactivation of biofilm-bound Pseudomonas aeruginosa cells using different UVC devices with varying peak emission wavelengths. The results show that UV LEDs, particularly those with a peak emission at 270 nm, provided the best disinfection performance. The study also observed the UV shielding effect of biofilm constituents and found that biofilm-bound cells were less UV-sensitive compared to planktonic cells. This study provides valuable insights for the use of emerging UV technologies in controlling biofilm and pathogens in water distribution systems.
Article
Engineering, Environmental
Roberto A. Rodriguez, Cesar Navar, Jatuwat Sangsanont, Karl G. Linden
Summary: Adenoviruses isolated from sewage samples showed high resistance to UV irradiation compared to laboratory grown strains, although the required doses for medium pressure UV lamps were still lower than low pressure UV lamps. These findings suggest that the fluence required for inactivation of adenoviruses in real-world waters may be higher than previously understood.
Review
Environmental Sciences
Ernest R. Blatchley, David J. Brenner, Holger Claus, Troy E. Cowan, Karl G. Linden, Yijing Liu, Ted Mao, Sung-Jin Park, Patrick J. Piper, Richard M. Simons, David H. Sliney
Summary: Far UV-C radiation, with wavelengths between 200 and 230 nm, is highly effective in inactivating airborne pathogens while having minimal potential to cause damage to human skin and eye tissues. By controlling indoor ozone production, Far UV-C devices can be used in occupied spaces to improve the inactivation of airborne pathogens, including those responsible for COVID-19.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Environmental Sciences
Jennifer Henderson, Ben Ma, Martin Cohen, Joel Dazey, John Scott Meschke, Karl G. Linden
Summary: The study evaluated the efficacy and safety of UVGI devices, finding that LP devices emitted sufficient UVC radiation to effectively inactivate SARS-CoV-2 within a short period of time, while KrCl* devices did not emit enough radiation for effective disinfection. UV fluence from KrCl* devices for employees was below ACGIH's Threshold Limit Values, but caution is necessary for photosensitive individuals and those exposed to multiple UV sources throughout the day.
JOURNAL OF OCCUPATIONAL AND ENVIRONMENTAL HYGIENE
(2022)
Article
Engineering, Environmental
Emma M. Payne, Bryan Liu, Lauren Mullen, Karl G. Linden
Summary: KrCl* excimer lamps emitting at 222 nm have the potential to enhance ultraviolet (UV)-based advanced oxidation efficiency. Experiments comparing low-pressure UV (LPUV) and KrCl* excimer lamps were conducted in ultrapure water and groundwater, with different radical promoters. The results showed that the concentration of hydroxyl radicals (.OH) achieved using KrCl*/NO3- UV/AOP was significantly higher than that of conventional LPUV/H2O2, both in ultrapure water and groundwater. Several research gaps were identified to facilitate the adoption of KrCl* for UV/AOP in the future.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2022)
Article
Biochemistry & Molecular Biology
Ben Ma, Kelly Bright, Luisa Ikner, Christian Ley, Saba Seyedi, Charles P. Gerba, Mark D. Sobsey, Patrick Piper, Karl G. Linden
Summary: This study investigates the effectiveness of a KrCl* excimer emitting at 222 nm in inactivating bacteria and viruses. The results show that the KrCl* excimer can effectively inactivate all tested microorganisms, with better disinfection performance for viruses compared to conventional UV lamps emitting at 254 nm.
PHOTOCHEMISTRY AND PHOTOBIOLOGY
(2023)
Article
Engineering, Environmental
Pranav Chintalapati, Cliff Nyaga, Jeffrey P. Walters, Johanna Koehler, Amy Javernick-Will, Rob Hope, Karl G. Linden
Summary: This study applies system dynamics modeling to assess the potential impact of scaling up professionalized maintenance services on piped water systems in Kitui County, Kenya. The results show that increasing professionalized maintenance services can improve the functionality rates of the water systems, reduce major breakdowns, and decrease government spending on repairs. However, substantial external financing or government subsidies are needed to make the service financially viable at scale.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Saba Seyedi, Ben Ma, Megan Groves, Hal King, Karl G. Linden
Summary: Far UV-C is an effective disinfection method that can be used in occupied areas. The use of filtered KrCl* excimer lamps emitting light at 222 nm has been proven to be safe for human exposure and can effectively disinfect pathogens. Laboratory and field testing showed that this method can achieve complete inactivation of viruses in a short exposure time. The study demonstrates the applicability and deployment of Far UV-C for pathogen reduction and provides valuable insights for its implementation in human-occupied environments.
PHOTOCHEMISTRY AND PHOTOBIOLOGY
(2023)
Article
Engineering, Environmental
Bryan Liu, Lauren Mullen, Emma M. Payne, Karl G. Linden
Summary: Krypton chloride (KrCl*) excimer ultraviolet (UV) light may offer advantages over conventional low-pressure (LP) UV for contaminant degradation. The authors investigated the direct and indirect photolysis as well as UV/hydrogen peroxide-driven advanced oxidation (AOP) of two chemical contaminants in different water samples using KrCl* and 254nm, 222nm UV sources. The results showed that the 222nm excimer lamps significantly improved the degradation of contaminants compared to the conventional 254nm LPUV. Rating: 8/10.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Lidori Edri, Karl G. Linden, Nadeem Ibrahim, Dror Avisar, Aviv Kaplan, Sarah Hayoune, Yaal Lester
Summary: Irradiation of nitrate (NO3-) with UVC light generates photo-sensitized oxidants, such as hydroxyl radicals (OH) and reactive nitrogen species (RNS), which can promote the degradation of contaminants. This study explores the degradation kinetics and photochemical parameters of groundwater contaminants under UV/NO3- treatment, and proposes metrics to determine the photosensitivity and radical reactivity of contaminants.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Bryan Liu, Anthony L. Pimentel, Michael J. Watts, Joanna R. Murphy, Karl G. Linden
Summary: This study investigates the benefits of in situ ozonation in extending ceramic membrane filtration and mitigating fouling during wastewater reuse. The results show that in situ ozonation significantly improves ceramic membrane flux and reduces fouling by transforming organic matter composition and reducing hydrophobicity.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Aidan Francis Meese, David J. Kim, Xuanhao Wu, Linh Le, Cade Napier, Mark T. Hernandez, Nicollette Laroco, Karl G. Linden, Jordan Cox, Parthiv Kurup, James McCall, David Greene, Michael Talmadge, Zhe Huang, Jordan Macknick, Kurban A. Sitterley, Ariel Miara, Anna Evans, Kiran Thirumaran, Mini Malhotra, Susana Garcia Gonzalez, Prakash Rao, Jennifer Stokes-Draut, Jae-Hong Kim
Summary: As water scarcity becomes more severe in the United States, it is crucial to develop strategies for reducing water use and improving water resource security. This study explores the potential of industrial wastewater as an alternative water resource through direct treatment and reuse. The researchers critically reviewed the current state of water use, treatment, and reuse in six representative industries and conducted a technoeconomic assessment to analyze the costs and potential for innovation in water treatment processes. The findings provide insights into the future of industrial water reuse and strategies for its expansion.
ACS ES&T ENGINEERING
(2022)
Article
Engineering, Environmental
Kaleisha D. Miller, Matthew J. Bentley, Joseph N. Ryan, Karl G. Linden, Caleb Larison, Benjamin A. Kienzle, Lynn E. Katz, Alana M. Wilson, Jordan T. Cox, Parthiv Kurup, Kurt M. Van Allsburg, James McCall, Jordan E. Macknick, Michael S. Talmadge, Ariel Miara, Kurban A. Sitterley, Anna Evans, Kiran Thirumaran, Mini Malhotra, Susana Garcia Gonzalez, Jennifer R. Stokes-Draut, Shankararaman Chellam
Summary: This study aims to evaluate the impact of mining on local water supplies and environments and identifies research directions for implementable, reliable, and cost-effective advanced water treatment in the mining sector. By reviewing existing literature and conducting case studies, this study reveals the water usage in mining, treatment technologies, and the potential for beneficial reuse. The study also assesses the national level impacts resulting from the reuse of treated mine source water.
ACS ES&T ENGINEERING
(2022)
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.
