keyword
https://read.qxmd.com/read/38531380/acetylene-tunes-microbial-growth-during-aerobic-cometabolism-of-trichloroethene
#1
JOURNAL ARTICLE
Justin P Skinner, Skye Palar, Channing Allen, Alia Raderstorf, Presley Blake, Arantza Morán Reyes, Riley N Berg, Christopher Muse, Aide Robles, Nasser Hamdan, Min-Ying Chu, Anca G Delgado
Microbial aerobic cometabolism is a possible treatment approach for large, dilute trichloroethene (TCE) plumes at groundwater contaminated sites. Rapid microbial growth and bioclogging pose a persistent problem in bioremediation schemes. Bioclogging reduces soil porosity and permeability, which negatively affects substrate distribution and contaminant treatment efficacy while also increasing the operation and maintenance costs of bioremediation. In this study, we evaluated the ability of acetylene, an oxygenase enzyme-specific inhibitor, to decrease biomass production while maintaining aerobic TCE cometabolism capacity upon removal of acetylene...
March 26, 2024: Environmental Science & Technology
https://read.qxmd.com/read/38521105/carboxymethyl-cellulose-stabilization-induced-changes-in-particle-characteristics-and-dechlorination-efficiency-of-sulfidated-nanoscale-zero-valent-iron
#2
JOURNAL ARTICLE
Li Gong, Shuaixuan Ying, Chenyun Xia, Ke Pan, Feng He
Polymer stabilization, exemplified by carboxymethyl cellulose (CMC), has demonstrated effectiveness in enhancing the transport of nanoscale zero-valent iron (nZVI). And, sulfidation is recognized for enhancing the reactivity and selectivity of nZVI in dechlorination processes. The influence of polymer stabilization on sulfidated nZVI (S-nZVI) with various sulfur precursors remains unclear. In this study, CMC-stabilized S-nZVI (CMC-S-nZVI) was synthesized using three distinct sulfur precursors (S2- , S2 O4 2- , and S2 O3 2- ) through one-step approach...
March 21, 2024: Chemosphere
https://read.qxmd.com/read/38521036/unveiling-complete-natural-reductive-dechlorination-mechanisms-of-chlorinated-ethenes-in-groundwater-insights-from-functional-gene-analysis
#3
JOURNAL ARTICLE
Zhuanxia Zhang, Mukhtiar Ali, Zhiwen Tang, Qi Sun, Qing Wang, Xin Liu, Lipu Yin, Song Yan, Minmin Xu, Frederic Coulon, Xin Song
Monitored natural attenuation (MNA) of chlorinated ethenes (CEs) has proven to be a cost-effective and environment-friendly approach for groundwater remediation. In this study, the complete dechlorination of CEs with formation of ethene under natural conditions, were observed at two CE-contaminated sites, including a pesticide manufacturing facility (PMF) and a fluorochemical plant (FCP), particularly in the deeply weathered bedrock aquifer at the FCP site. Additionally, a higher abundance of CE-degrading bacteria was identified with heightened dechlorination activities at the PMF site, compared to the FCP site...
March 13, 2024: Journal of Hazardous Materials
https://read.qxmd.com/read/38505149/reductive-dechlorination-of-chlorinated-ethenes-at-the-sulfidated-zero-valent-iron-surface-a-mechanistic-dft-study
#4
JOURNAL ARTICLE
Miroslav Brumovský, Daniel Tunega
Sulfidated nano- and microscale zero-valent iron (S-(n)ZVI) has shown enhanced selectivity and reactive lifetime in the degradation of chlorinated ethenes (CEs) compared to pristine (n)ZVI. However, varying effects of sulfidation on the dechlorination rates of structurally similar CEs have been reported, with the underlying mechanisms remaining poorly understood. In this study, we investigated the β -dichloroelimination reactions of tetrachloroethene (PCE), trichloroethene (TCE), cis -1,2-dichloroethene ( cis -DCE), and trans -1,2-dichloroethene ( trans -DCE) at the S and Fe sites of several S-(n)ZVI surface models by using density functional theory...
March 14, 2024: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://read.qxmd.com/read/38499929/preliminary-insights-on-the-development-of-a-continuous-flow-solar-system-for-the-photocatalytic-degradation-of-contaminants-of-emerging-concern-in-water
#5
JOURNAL ARTICLE
Beni Jequicene Mussengue Chaúque, Louise Jank, Antônio Domingues Benetti, Marilise Brittes Rott
The ubiquity and impact of pharmaceuticals and pesticides, as well as their residues in environmental compartments, particularly in water, have raised human and environmental health concerns. This emphasizes the need of developing sustainable methods for their removal. Solar-driven photocatalytic degradation has emerged as a promising approach for the chemical decontamination of water, sparking intensive scientific research in this field. Advancements in photocatalytic materials have driven the need for solar reactors that efficiently integrate photocatalysts for real-world water treatment...
March 19, 2024: Environmental Science and Pollution Research International
https://read.qxmd.com/read/38494001/biochar-enhanced-anaerobic-mixed-culture-for-biodegradation-of-1-2-dichloroethane-microbial-community-mechanisms-and-techno-economics
#6
JOURNAL ARTICLE
Khaled Hasanan, Omnia A Badr, Rasha El-Meihy, Mahmoud Nasr, Ahmed Elmitwalli
While anaerobic digestion (AD) has been employed for the degradation of chlorinated aliphatic hydrocarbons, the associated digester performance might suffer from volatile fatty acids accumulation, insufficient substrate-microbes interaction, and lower biogas yields. To overcome these limitations, this study is the first to augment the hydrocarbon-degrading microbial capacities by adding agricultural waste-based biochar to the digestion medium. 1,2-dichloroethane (1,2-DCA) was selected as the target pollutant because it is discharged in large quantities from oil refining, petrochemical, and chemical industries, causing serious environmental and human health concerns...
March 15, 2024: Chemosphere
https://read.qxmd.com/read/38493868/bioremediation-of-trichloroethylene-contaminated-groundwater-using-green-carbon-releasing-substrate-with-ph-control-capability
#7
JOURNAL ARTICLE
Hsin-Chia Lee, Ssu-Ching Chen, Yih-Terng Sheu, Chao-Ling Yao, Kai-Hung Lo, Chih-Ming Kao
In this research, a sustainable substrate, termed green and long-lasting substrate (GLS), featuring a blend of emulsified substrate (ES) and modified rice husk ash (m-RHA) was devised. The primary objective was to facilitate the bioremediation of groundwater contaminated with trichloroethylene (TCE) using innovative GLS for slow carbon release and pH control. The GLS was concocted by homogenizing a mixture of soybean oil, surfactants (Simple Green™ and soya lecithin), and m-RHA, ensuring a gradual release of carbon sources...
March 15, 2024: Environmental Pollution
https://read.qxmd.com/read/38492479/anaerobic-biotransformation-of-hexachlorocyclohexane-isomers-in-aqueous-condition-dual-ccl-isotope-fractionation-and-impact-on-microbial-community-compositions
#8
JOURNAL ARTICLE
Xinyu Zhang, Yan Zheng, Ziming Su, Zhenyu Wang, Jian Zhang, Zhongjun Jia, Steffen Kümmel, Chengrong Qin, Yaqing Liu, Shuangfei Wang, Ivonne Nijenhuis, Hans H Richnow
Hexachlorocyclohexane (HCH) isomers are persistent organic pollutants (POPs) with high toxicity, lipid solubility, chemical stability. Despite the current ban on usage of Lindane, residual contamination cannot be ignored, and HCH are frequently detected in groundwater and threaten human health. Cultures capable of degrading α-HCH, β-HCH, γ-HCH, and δ-HCH individually have been enriched in anoxic aqueous conditions. Compound-Specific Isotope Analysis (CSIA) was applied to examine the transformation mechanisms of different HCH isomers by the four enrichment cultures...
February 27, 2024: Water Research
https://read.qxmd.com/read/38492090/degradation-of-atrazine-by-an-anaerobic-microbial-consortium-enriched-from-soil-of-an-herbicide-manufacturing-plant
#9
JOURNAL ARTICLE
Yixuan Bao, Shiyu Zhao, Ningning Wu, Ye Yuan, Luyao Ruan, Jian He
Atrazine is an important herbicide that has been widely used for weed control in recent decades. However, with the extensive use of atrazine, its residue seriously pollutes the environment. Therefore, the microbial degradation and detoxification of atrazine have received extensive attention. To date, the aerobic degradation pathway of atrazine has been well studied; however, little is known about its anaerobic degradation in the environment. In this study, an anaerobic microbial consortium capable of efficiently degrading atrazine was enriched from soil collected from an herbicide-manufacturing plant...
March 16, 2024: Current Microbiology
https://read.qxmd.com/read/38491554/global-prevalence-of-organohalide-respiring-bacteria-dechlorinating-polychlorinated-biphenyls-in-sewage-sludge
#10
JOURNAL ARTICLE
Guofang Xu, Siyan Zhao, Matthew J Rogers, Chen Chen, Jianzhong He
BACKGROUND: Massive amounts of sewage sludge are generated during biological sewage treatment and are commonly subjected to anaerobic digestion, land application, and landfill disposal. Concurrently, persistent organic pollutants (POPs) are frequently found in sludge treatment and disposal systems, posing significant risks to both human health and wildlife. Metabolically versatile microorganisms originating from sewage sludge are inevitably introduced to sludge treatment and disposal systems, potentially affecting the fate of POPs...
March 16, 2024: Microbiome
https://read.qxmd.com/read/38488840/co-single-atom-reverse-hydrogen-spillover-for-efficient-electrochemical-water-dissociation-and-dechlorination
#11
JOURNAL ARTICLE
Qian Zheng, Hengyue Xu, Yancai Yao, Jie Dai, Jiaxian Wang, Wei Hou, Long Zhao, Xingyue Zou, Guangming Zhan, Ruizhao Wang, Kaiyuan Wang, Lizhi Zhang
Efficient water dissociation to atomic hydrogen (H*) with restrained recombination of H* is crucial for improving the H* utilization for electrochemical dechlorination, but is currently limited by the lack of feasible electrodes. Here, we developed a monolithic single-atom electrode with Co single atoms anchored on the inherent oxide layer of titanium foam (Co1-TiOx/Ti), which can efficiently dissociate water into H* and simultaneously inhibit the recombination of H*, by taking advantage of the single-atom reverse hydrogen spillover effect...
March 15, 2024: Angewandte Chemie
https://read.qxmd.com/read/38484382/prediction-of-base-catalyzed-hydrolysis-kinetics-of-polychlorinated-dibenzo-p-dioxins-by-density-functional-theory-calculations
#12
JOURNAL ARTICLE
Haiqin Zhang, Kun Xie, Qing Luo, Jiaxi Tang, Ya-Nan Zhang
Polychlorinated dibenzo- p -dioxins (PCDDs), comprising 75 congeners, have gained considerable attention from the general public and the scientific community owing to their high toxic potential. The base-catalyzed hydrolysis of PCDDs is crucial for the assessment of their environmental persistence. Nonetheless, owing to the substantial number of congeners and low hydrolysis rates of PCDDs, conducting hydrolysis experiments proves to be exceedingly time-consuming and financially burdensome. Herein, density functional theory and transition state theory were employed to predict the base-catalyzed hydrolysis of PCDDs in aquatic environments...
March 14, 2024: Environmental Science & Technology
https://read.qxmd.com/read/38483834/co-2-promoted-electrocatalytic-reduction-of-chlorinated-hydrocarbons
#13
JOURNAL ARTICLE
Chungseok Choi, Soonho Kwon, Yuanzuo Gao, Seonjeong Cheon, Jing Li, Fabian Menges, William A Goddard, Hailiang Wang
Electrochemical reactions and their catalysis are important for energy and environmental applications, such as carbon neutralization and water purification. However, the synergy in electrocatalysis between CO2 utilization and wastewater treatment has not been explored. In this study, we find that the electrochemical reduction of chlorinated organic compounds such as 1,2-dichloroethane, trichloroethylene, and tetrachloroethylene into ethylene in aqueous media, which is a category of challenging reactions due to the competition of H2 evolution, can be substantially enhanced by simultaneously carrying out the reduction of CO2 on an easily prepared and cost-effective Cu metal catalyst...
March 14, 2024: Journal of the American Chemical Society
https://read.qxmd.com/read/38478968/modeled-pathways-and-fluxes-of-pcb-dechlorination-by-redox-potentials
#14
JOURNAL ARTICLE
Xiang-Fei Sun, Yan Xu, Mitchell J Small, David Yaron, Eddy Y Zeng
Dechlorination is one of the main processes for the natural degradation of polychlorinated biphenyls (PCBs) in an anaerobic environment. However, PCB dechlorination pathways and products vary with PCB congeners, types of functional dechlorinating bacteria, and environmental conditions. The present study develops a novel model for determining dechlorination pathways and fluxes by tracking redox potential variability, transforming the complex dechlorination process into a stepwise sequence. The redox potential is calculated via the Gibbs free energy of formation, PCB concentrations in reactants and products, and environmental conditions...
March 13, 2024: Environmental Science & Technology
https://read.qxmd.com/read/38471945/-characterization-of-reductive-dechlorination-of-chlorinated-ethylenes-by-anaerobic-consortium
#15
JOURNAL ARTICLE
Wei Li, Gui-Ping Liu, Jun Liu, Liang-Hua Lü, Wen-Jing Qiao, Xin Yu, Xiao-Yang Zhang, Jian-Dong Jiang
Tetrachloroethylene (PCE) and trichloroethylene (TCE) are typical volatile halogenated organic compounds in groundwater that pose serious threats to the ecological environment and human health. To obtain an anaerobic microbial consortium capable of efficiently dechlorinating PCE and TCE to a non-toxic end product and to explore its potential in treating contaminated groundwater, an anaerobic microbial consortium W-1 that completely dechlorinated PCE and TCE to ethylene was obtained by repeatedly feeding PCE or TCE into the contaminated groundwater collected from an industrial site...
February 8, 2024: Huan Jing Ke Xue= Huanjing Kexue
https://read.qxmd.com/read/38447365/chemical-physical-parameters-and-microbial-community-changes-induced-by-electrodes-polarization-inhibit-pcb-dechlorination-in-a-marine-sediment
#16
JOURNAL ARTICLE
Alberto Botti, Eliana Musmeci, Bruna Matturro, Giampietro Vanzetto, Caterina Bosticco, Andrea Negroni, Simona Rossetti, Fabio Fava, Elena Biagi, Giulio Zanaroli
Microbial reductive dechlorination of organohalogenated pollutants is often limited by the scarcity of electron donors, that can be overcome with microbial electrochemical technologies (METs). In this study, polarized electrodes buried in marine sediment microcosms were investigated to stimulate PCB reductive dechlorination under potentiostatic (-0.7 V vs Ag/AgCl) and galvanostatic conditions (0.025 mA·cm-2 -0.05 mA·cm-2 ), using graphite rod as cathode and iron plate as sacrificial anode...
February 24, 2024: Journal of Hazardous Materials
https://read.qxmd.com/read/38445390/pd-np-loaded-covalent-organic-framework-for-ph-switched-pickering-emulsion-catalytic-dechlorination
#17
JOURNAL ARTICLE
Han-Hui Wang, Fei Li, Bing-Jian Yao, Yu-Bin Dong
Quinoline carboxylic acid-linked and Pd nanoparticle (NP)-loaded COF nanospheres were constructed via a three-component one-pot Doebner reaction and post-synthetic metalation. The obtained Pd@DhaTAPB-COOH solid stabilizer can greatly promote the pH-switched recyclable Pickering interfacial dechlorination reaction, which sheds light on the bright future of smart Pickering emulsion catalysis.
March 6, 2024: Chemical Communications: Chem Comm
https://read.qxmd.com/read/38430692/on-the-reliable-estimation-of-sequential-monod-kinetic-parameters
#18
JOURNAL ARTICLE
Jack L Elsey, Eric L Miller, John A Christ, Linda M Abriola
While dozens of studies have attempted to estimate the Monod kinetic parameters of microbial reductive dechlorination, published values in the literature vary by 2-6 orders of magnitude. This lack of consensus can be attributed in part to limitations of both experimental design and parameter estimation techniques. To address these issues, Hamiltonian Monte Carlo was used to produce more than one million sets of realistic simulated microcosm data under a variety of experimental conditions. These data were then employed in model fitting experiments using a number of parameter estimation algorithms for determining Monod kinetic parameters...
February 20, 2024: Journal of Contaminant Hydrology
https://read.qxmd.com/read/38430602/unveiling-the-effect-of-different-dissolved-organic-matter-dom-on-catalytic-dechlorination-of-nfe-ni-particles-corrosion-and-passivation-effect
#19
JOURNAL ARTICLE
Cholnam Ri, Munchol Kim, Hyokchol Mun, Linan Liu, Jingchun Tang
Dissolved organic matter (DOM), which is ubiquitously distributed in groundwater, has a crucial role in the fate and reactivity of iron materials. However, there is a lack of direct evidence on how different DOMs interact with nFe/Ni in promoting or inhibiting the dechlorination efficiency of chlorinated aromatic contaminants. By comparing humic acid (HA), fulvic acid (FA), and biochar-derived dissolved organic matter (BDOM) at different pyrolysis temperatures, we first demonstrated that the dechlorination effect of nFe/Ni on 2,4-dichlorophenol (2,4-DCP) depended on the nature of DOMs and their adsorption on nFe/Ni...
February 27, 2024: Journal of Hazardous Materials
https://read.qxmd.com/read/38428238/fe-ii-coordination-transition-regulates-reductive-dechlorination-the-overlooked-abiotic-role-of-lactate
#20
JOURNAL ARTICLE
Qian-Qian Jia, Xue-Jie Zhang, Liandong Zhu, Li-Zhi Huang
The coordination environment of Fe(II) significantly affect the reductive reactivity of Fe(II). Lactate is a common substrate for enhancing microbial dechlorination, but its effect on abiotic Fe(II)-driven reductive dechlorination is largely ignored. In this study, the structure-reactivity relationship of Fe(II) is investigated by regulating the ratio of lactate:Fe(II). This work shows that lactate-Fe(II) complexing enhances the abiotic Fe(II)-driven reductive dechlorination with the optimum lactate:Fe(II) ratio of 10:20...
February 19, 2024: Water Research
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