Unveiling the synergistic potential of ferrate and pyrophosphate co-pretreatment enhancing anaerobic sludge fermentation: Performance and mechanistic insights

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: 505, P. 159612 - 159612

Published: Jan. 15, 2025

Language: Английский

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Evaluation of nitrous oxide reduction in solid carbon source-driven counter-diffusional biofilm denitrification system

Water Research X, Journal Year: 2025, Volume and Issue: 27, P. 100306 - 100306

Published: Jan. 22, 2025

Solid carbon-driven biofilm system can provide sufficient carbon source for denitrification, while its counter-diffusional structure could inevitably induce the delayed carbon-nitrogen contact and electron transport, further affecting footprints mainly contributed by nitrous oxide (N2O) at wastewater treatment plants (WWTPs). However, detailed understanding of N2O dynamics during solid-phase denitrification (SPD) has not been disclosed. In this work, a fixed bed bioreactor driven polycaprolactone (PCL) was constructed operated over 180 days, achieving 97 %-99 % total nitrogen (TN) removal efficiency. Biochemical results indicated that under condition each (NO x ) concentration maintained 30 mg-N/L, competition between upstream downstream pools still observed PCL-driven even providing source. For example, coexistent nitrate (NO3 -)+ nitrite (NO2 -)+N2O condition, few electrons (i.e., 12.6 %) distributed to reductase (Nos), significantly decreasing reduction rate 1.42 mg/g VSS/h). Under TN in scheme containing NO3 -+NO2 -+N2O be 1.75-2.3 times higher than with sole NO mg-N/L. This suggested when treating multiple , only relatively improve efficiency, but also alleviate emissions. The abundance Bacteroidota Comamonadaceae ensured stable release conversion states.

Language: Английский

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In situ formed colloidal manganese dioxide enhances permanganate oxidation for sulfide control in sewers

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160227 - 160227

Published: Feb. 1, 2025

Language: Английский

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Boosting the biosynthesis of medium-chain fatty acids from waste activated sludge electro-fermentation: Roles of syngas and ethanol serving as co-electron donors

Journal of Cleaner Production, Journal Year: 2025, Volume and Issue: unknown, P. 145383 - 145383

Published: March 1, 2025

Language: Английский

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Comprehensive review of microbial production of medium-chain fatty acids from waste activated sludge and enhancement strategy

Bioresource Technology, Journal Year: 2024, Volume and Issue: 402, P. 130782 - 130782

Published: May 1, 2024

Language: Английский

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Interaction of poly dimethyl diallyl ammonium chloride with sludge components: Anaerobic digestion performance and adaptive changes of anaerobic microbes

Water Research, Journal Year: 2024, Volume and Issue: 266, P. 122368 - 122368

Published: Sept. 2, 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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Biodegradable microplastics aggravate greenhouse gas emissions from urban lake sediments more severely than conventional microplastics

Water Research, Journal Year: 2024, Volume and Issue: 266, P. 122334 - 122334

Published: Aug. 25, 2024

Language: Английский

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Effect, Fate and Remediation of Pharmaceuticals and Personal Care Products (PPCPs) during Anaerobic Sludge Treatment: A Review

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(43), P. 19095 - 19114

Published: Oct. 21, 2024

Biomass energy recovery from sewage sludge through anaerobic treatment is vital for environmental sustainability and a circular economy. However, large amounts of pharmaceutical personal care products (PPCPs) remain in sludge, their interactions with microbes enzymes would affect resource recovery. This article reviews the effects mechanisms PPCPs on treatment. Most posed adverse impacts methane production, while certain low-toxicity could stimulate volatile fatty acids biohydrogen accumulation. Changes microbial community structure functional enzyme bioactivities were also summarized exposure. Notably, such as carbamazepine bind active sites induce stress responses. The fate various during indicated that featuring electron-donating groups (e.g., ·-NH

Language: Английский

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Permanganate pretreatment Improves the production of short chain fatty acids from waste activated sludge at pH10: Performance and mechanism

Separation and Purification Technology, Journal Year: 2025, Volume and Issue: unknown, P. 131692 - 131692

Published: Jan. 1, 2025

Language: Английский

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