Characterizing hazardous substances of shale gas wastewater from the upper Yangtze River: A focus on heavy metals and organic compounds

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 469, P. 133873 - 133873

Published: Feb. 24, 2024

Language: Английский

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Ferrate(VI)-based oxidation for ultrafiltration membrane fouling mitigation in shale gas produced water pretreatment: Role of high-valent iron intermediates and hydroxyl radicals

Water Research, Journal Year: 2024, Volume and Issue: 261, P. 122013 - 122013

Published: June 28, 2024

Language: Английский

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Prioritizing Organic Pollutants for Shale Gas Exploitation: Life Cycle Environmental Risk Assessments in China and the US

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(19), P. 8149 - 8160

Published: April 23, 2024

Environmental impacts associated with shale gas exploitation have been historically underestimated due to neglecting account for the production or release of end-of-pipe organic pollutants. Here, we assessed environmental in China and United States using life cycle assessment. Through data mining, compiled literature information on pollutants flowback produced water (FPW), followed by assessments USEtox evaluate risks. Results were incorporated reveal risks both countries. exhibited higher than US during phase. Substantially different types compounds observed FPW between two Human carcinogenic ecological toxicity attributed organics was 3 orders magnitude that phase US. Conversely, China, accounted approximately 52%, 1%, 47% overall human carcinogenic, noncarcinogenic, impacts, respectively. This may be partially limited quantitative available. While uncertainties exist availability, our study highlights significance integrating from pollution comprehensive risk assessments.

Language: Английский

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Impacts of shale gas wastewater leaks on neighboring crops: physiological and morphological responses of tomatoes

Process Safety and Environmental Protection, Journal Year: 2025, Volume and Issue: unknown, P. 106786 - 106786

Published: Jan. 1, 2025

Language: Английский

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Nontarget Screening and Identification of Organic Additives and Transformation Products in Drilling Cutting and Flowback Water Related to Shale Gas Extraction

ACS ES&T Water, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 17, 2025

With the rapid development of shale gas exploitation, large quantities drilling cuttings (DCs) and flowback waters (FWs) laden with organics are produced. These organics, whose chemical compositions largely unknown, could be toxic to organisms in receiving environment. This study collected two time series DCs FWs from different exploitation platforms Sichuan Basin, China. We developed a nontarget analytical method identify organic additives as well their degradation products these observed variable levels FWs. The variation ascribed varied geological formations unique techniques. Alcohol ethoxylates (AEOs) quaternary ammonium compounds (QACs) were identified main water-based cutting AEOs alkylbenzenesulfonate related Meanwhile, nonylphenol (NPEOs) QACs predominant surfactants oil-based cutting, polyethylene glycols (PEGs) dominating Carboxylated PEGs, polypropylene glycols, NPEOs, octylphenol widely FWs, evincing biotic/abiotic transformation chain-shortening downhole.

Language: Английский

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Sodium percarbonate/Fe(II) pre-oxidation enhancing coagulation for shale oil flowback water decontamination: Identification, removal and transformation of dissolved organic matter

Journal of Water Process Engineering, Journal Year: 2025, Volume and Issue: 71, P. 107166 - 107166

Published: Feb. 4, 2025

Language: Английский

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Identifying and prioritizing organic toxicants in treated flowback and produced water from shale gas exploitation sites using an integrative effect-directed analysis and nontarget screening method

Water Research, Journal Year: 2025, Volume and Issue: unknown, P. 123311 - 123311

Published: Feb. 1, 2025

Language: Английский

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Produced water treatment by semi-continuous sequential bioreactor and microalgae photobioreactor

Bioresources and Bioprocessing, Journal Year: 2024, Volume and Issue: 11(1)

Published: June 2, 2024

Abstract Produced water (PW) from oil and gas exploration adversely affects aquatic life living organisms, necessitating treatment before discharge to meet effluent permissible limits. This study first used activated sludge pretreat PW in a sequential batch reactor (SBR). The pretreated then entered 13 L photobioreactor (PBR) containing Scenedesmus obliquus microalgae culture. Initially, 10% of the mixed with 90% culture PBR. After exponential growth microalgae, an additional 25% was added PBR without extra nutrients. reported performance as well reduction effluent’s total organic carbon (TOC), dissolved solids (TDS), electrical conductivity (EC), heavy metals content. results demonstrated removal efficiencies 64% for TOC, 49.8% TDS, 49.1% EC. also showed reductions barium, iron, manganese by 95, 76, 52%, respectively.

Language: Английский

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New insight in the biotreatment of produced water: Pre-oxidation paves a rapid pathway for substrate selection in microbial community

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 480, P. 136483 - 136483

Published: Nov. 10, 2024

Language: Английский

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Data driven multiple objective optimization of AAO process towards wastewater effluent biological toxicity reduction

npj Clean Water, Journal Year: 2024, Volume and Issue: 7(1)

Published: July 12, 2024

Abstract While the anaerobic-anoxic-oxic (AAO) process is most widely applied biological wastewater treatment in municipal plants (WWTPs), it struggles to meet increasing demands on toxicity control of treated effluent. To tackle this challenge, study develops machine learning (ML)-based models for optimizing AAO towards improving its reduction efficacy The water quality parameters, and information (based nematode bioassay) effluent collected from 122 WWTPs China are used train models. validated accurately predict effluent’s parameters (average R 2 = 0.81) ratio (R 0.86). further improve reduction, we developed a multiple objective optimization framework optimize via unit recombination. In short-range combination, four-unit combined processes (up 79.8% anaerobic-aerobic-anaerobic-aerobic) significantly higher than others. After optimization, helps average 48.6% 70.7%, with maximum 87.5%. methodologies findings derived work expected provide foundation expansion, technical transformation WWTPs.

Language: Английский

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