Mitigating greenhouse gas emissions from municipal wastewater treatment in China

Environmental Science and Ecotechnology, Journal Year: 2023, Volume and Issue: 20, P. 100341 - 100341

Published: Nov. 13, 2023

Municipal wastewater treatment plays an indispensable role in enhancing water quality by eliminating contaminants. While the process is vital, its environmental footprint, especially terms of greenhouse gas (GHG) emissions, remains underexplored. Here we offer a comprehensive assessment GHG emissions from plants (WWTPs) across China. Our analyses reveal estimated 1.54 (0.92–2.65) × 104 Gg release GHGs (CO2-eq) 2020, with dominant contribution N2O and electricity consumption. We can foresee 60–65 % reduction potential promising advancements treatment, such as cutting-edge biological techniques, intelligent strategies, shift towards renewable energy sources.

Language: Английский

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Deciphering the role of hydraulic retention time (HRT) in integrated fixed-film activated sludge (IFAS) system under aniline stress: Effects on microbial succession and communication

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 482, P. 148834 - 148834

Published: Jan. 19, 2024

Language: Английский

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Polyvinyl Chloride Microplastics Facilitate Nitrous Oxide Production in Partial Nitritation Systems

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(4), P. 1954 - 1965

Published: Jan. 19, 2024

Partial nitritation (PN) is an important partner with anammox in the sidestream line treating high-strength wastewater and primarily contributes to nitrous oxide (N2O) emissions such a hybrid system, which also suffers from ubiquitous microplastics because of growing usage disposal levels plastics. In this study, influences polyvinyl chloride (PVC-MPs) on N2O-contributing pathways were experimentally revealed fill knowledge gap N2O emission PN system under stress. The long-term results showed that overall performance was hardly affected by low-dose PVC-MPs (0.5 mg/L) while obviously deteriorated high dose (5 mg/L). According batch tests, reduced biomass-specific ammonia oxidation rates (AORs) 5.78–21.94% stimulated aerobic production 9.22–88.36%. Further, upon increasing dissolved oxygen concentrations 0.3 0.9 mg O2/L, degree AOR inhibition increased but stimulation lightened. Site preference analysis combination metabolic inhibitors demonstrated contributions hydroxylamine heterotrophic denitrification at O2/L enhanced 18.84 10.34%, respectively, accompanied corresponding decreased contribution nitrifier denitrification. Finally, underlying mechanisms proposed for negative bisphenol A leaching reactive species production, led more cell death, altered sludge properties, reshaped microbial communities, further resulting emission. Overall, work implied are hidden danger cannot be ignored system.

Language: Английский

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Synchronous Achievement of Advanced Nitrogen Removal and N₂O Reduction in the Anoxic Zone in the AOA Process for Low C/N Municipal Wastewater

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(5), P. 2335 - 2345

Published: Jan. 25, 2024

Continuous flow processes for the in situ determination of N

Language: Английский

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Biodegradable Microplastics Increase N₂O Emission from Denitrifying Sludge More Than Conventional Microplastics

Environmental Science & Technology Letters, Journal Year: 2024, Volume and Issue: unknown

Published: June 10, 2024

Despite the increasing concern about impacts of microplastics on wastewater treatment, underlying mechanism by which affect nitrous oxide (N2O) accumulation during denitrification is still underexplored. In particular, effects biodegradable (BMPs) sewage sludge systems are largely overlooked. Previous studies often used one type polymer as model microplastics, far from a real-world scenario various occurring simultaneously. This work assesses toxic influences chronically adding four typical BMPs versus conventional nonbiodegradable (NBMPs) to denitrifying sludge. Our results showed that both and NBMPs suppressed performance, intensified electron competition, regulated distribution, consequently promoted N2O at chemical oxygen demand:nitrate ratio <4:1. Importantly, more severe were observed in reactor with BMPs. A subsequent mechanistic study revealed significantly decreased relative abundances denitrifiers key genes involved transport consumption system (ETCS), might be related varied extracellular polymeric substance components. contrast, damaged bacterial membranes directly caused dead cells overproducing reactive species, hence disrupting ETCS. Overall, this suggested wastewater, especially BMPs, could disrupt potentially increase greenhouse gas emission.

Language: Английский

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Percarbonate-strengthened ferrate pretreatment for enhancing short-chain fatty acids production from sewage sludge

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 904, P. 166771 - 166771

Published: Sept. 1, 2023

Language: Английский

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High ammonia loading rate and biofilm reattachment initiated partial nitrification and anammox in a membrane aerated biofilm reactor

Journal of Water Process Engineering, Journal Year: 2024, Volume and Issue: 58, P. 104829 - 104829

Published: Jan. 22, 2024

Language: Английский

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Smaller sizes of polyethylene terephthalate microplastics mainly stimulate heterotrophic N2O production in aerobic granular sludge systems

Water Research X, Journal Year: 2024, Volume and Issue: 27, P. 100299 - 100299

Published: Dec. 27, 2024

Widespread polyethylene terephthalate microplastics (PET MPs) have played unintended role in nitrous oxide (N2O) turnovers (i.e., production and consumption) at wastewater treatment plants (WWTPs). Mainstream aerobic granular sludge (AGS) systems possess potentially strong N2O-sink capability, which may be reduced by PET MPs stress through altering N2O-contributing pathways, electron transfer, microbial community structures. In this study, the effects of with two common particle sizes effluent from WWTPs (0.1 0.5 mm) on N2O turnovers, pathways capability were systematically disclosed AGS a series biochemical tests molecular biological means to achieve goal carbon neutrality. The results indicated that 0.1 mm could more significantly stimulate inhibiting denitrifying metabolism, compared control systems. Specifically, slightly increased relative abundance Nitrosomonas, reducing yields via promoting hydroxylamine (NH2OH) oxidation pathway during nitrification. Also, inhibited transport system activities reductase, hindering reduction denitrification. Most importantly, apparently based ratio reductase gene nitrite gene.

Language: Английский

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New insights into the effect of EDTA on pyrite oxidation and N2O emission during pyrite autotrophic denitrification

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 481, P. 148583 - 148583

Published: Jan. 6, 2024

Language: Английский

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Denitrification reaction performance in three-dimensional biofilm electrode reactors using self-releasing carbon biofilm electrodes

Journal of Water Process Engineering, Journal Year: 2024, Volume and Issue: 60, P. 105189 - 105189

Published: March 23, 2024

Language: Английский

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