Enhanced removal of carbamazepine by microalgal-fungal symbiotic systems in the presence of Mn(II): Synergistic mechanisms and microbial community dynamicsa

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: 493, P. 138342 - 138342

Published: April 22, 2025

Language: Английский

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Intermittent Microaeration Enhanced Anaerobic Digestion: The Key Role of Fe(III)/Fe(II) Cycle and Reactive Oxygen Species

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: April 24, 2025

Microaeration has been reported to improve anaerobic digestion, which is generally attributed increased microbial diversity, but a thorough explanation lacking. In this study, it was found that intermittent microaeration (IMA) supplied an digester could oxidize Fe(II) produced by dissimilatory iron reduction (DIR) form Fe(III)/Fe(II) cycle and generate extracellular reactive oxygen species (ROS) treatment of phenol-containing wastewater. The results showed compared the control group without IMA, removal rates COD phenol 29.54 49.68 percentage points, respectively, daily average methane production 85.44%. slowed down loss (13.97%) released from sludge due lower solubility Fe(III) facilitated •OH generation (1.22 ± 0.04 μM) via Fenton-like reactions. DIR accelerated degradation. Metagenomic analysis revealed abundance methanogens antioxidant enzymes-encoding genes in response oxidative stress significantly IMA control, enabling methanogenesis proceed smoothly under microaeration. This study investigated ROS induced during digestion their roles promoting performance, thereby providing new perspective for optimizing systems with

Language: Английский

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Linking Oxygen-Induced Oxidative Stress to Resource Recovery by Enhancing the Production of Extracellular Polymeric Substances in Activated Sludge Microbial Communities

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2025, Volume and Issue: unknown

Published: April 29, 2025

Abstract As the global transition toward circular wastewater treatment intensifies, extracellular polymeric substances (EPS) have emerged as valuable targets for resource recovery. Although most efforts focused on aerobic granular sludge, conventional activated sludge systems, which account treatment, remain underexploited EPS Building established link between oxidative stress and biosynthesis in pure strains, we propose that strategically manipulating oxygen exposure patterns to intensify microbial communities could enhance production. To test this, applied continuous perturbation under stress. Compared a stable condition simulating typical aeration, considerably enhanced yield 74.4□mg/L/day, 90.5% increase over (39.0□mg/L/day). validate role of enhancement, intermittent anoxic phases were introduced into pattern relieve stress, causing EPS-enhancing effect disappear, with dropping 9.8□mg/L/day. Mechanistically, intensified was primarily driven by elevated reducing substrates non-respiratory flavoenzymes, exemplified glutamate synthase, glutathione reductase, dihydrolipoamide dehydrogenase, are prone generate H 2 O an unintended metabolic byproduct. Among multiple groups contributing production, Methylophilaceae, Comamonadaceae , Rhodobacteraceae distinguished simultaneously exhibiting upregulation proteins, suggesting taxa within these families collectively mediated both production enhancement. By modulating this study offers chemical-free, controllable strategy enhancing systems. Graphical abstract

Language: Английский

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Microbial advanced oxidation aroused by bacteria-algae symbiosis induced abiotic methane production in anaerobic digestion

Water Research, Journal Year: 2025, Volume and Issue: 282, P. 123776 - 123776

Published: May 3, 2025

Language: Английский

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Efficient treatment of mariculture wastewater in a bacteria-algal symbiotic moving bed biofilm reactor: Impact of aerobic/anoxic duration

Chemical Engineering Science, Journal Year: 2025, Volume and Issue: unknown, P. 121814 - 121814

Published: May 1, 2025

Language: Английский

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