Simultaneous removal of ammonia, copper ions and sulfamethoxazole from aquaculture wastewater with low carbon to nitrogen ratio enhanced by manganese redox driven by a two-stage synergistic bioreactor: Optimization and potential mechanism

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 482, P. 136586 - 136586

Published: Nov. 20, 2024

Language: Английский

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Extracellular electron transfer for aerobic denitrification mediated by the bioelectric catalytic system with zero-carbon source

Ecotoxicology and Environmental Safety, Journal Year: 2023, Volume and Issue: 268, P. 115691 - 115691

Published: Nov. 17, 2023

The slow rate of electron transfer and the large consumption carbon sources are technical bottlenecks in biological treatment wastewater. Here, we first proposed to domesticate aerobic denitrifying bacteria (ADB) from heterotrophic autotrophic by electricity (0.6 V) under zero organic source conditions, accelerate shorten hydraulic retention time (HRT) while increasing biodegradation rate. Then investigated extracellular (EET) mechanism mediated this process, additionally examined integrated nitrogen removal efficiency system with composite pollution. It was demonstrated that compared traditional membrane bioreactor (MBR), BEC displayed higher efficiency. Especially at C/N = 0, exhibited a NO3--N 95.42 ± 2.71 % for 4 h, which about 6.5 times than MBR. Under compound pollution condition, still maintained high tetracycline (94.52 2.01 91.50 0.001 %), greatly superior MBR (10.64 12.00 0.019 %). In addition, in-situ electrochemical tests showed nitrate could be directly converted N2 reduction using electrons cathode, successfully as terminal acceptor.

Language: Английский

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Palygorskite-mediated simultaneous nutrient removal and antibiotic degradation from aquaculture wastewater in lab-scale constructed wetlands

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 499, P. 156568 - 156568

Published: Oct. 10, 2024

Language: Английский

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Acyl-Homoserine Lactone Enhances the Resistance of Anammox Consortia under Heavy Metal Stress: Quorum Sensing Regulatory Mechanism

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

Published: Dec. 26, 2024

Anaerobic ammonium oxidation (anammox) represents an energy-efficient process for the removal of biological nitrogen from ammonium-rich wastewater. However, susceptibility anammox bacteria to coexisting heavy metals considerably restricts their use in engineering practices. Here, we report that acyl-homoserine lactone (AHL), a signaling molecule mediates quorum sensing (QS), significantly enhances rate by 24% under Cu2+ stress. A suite macro-/microanalytical and bioinformatic analyses was exploited unravel underlying mechanisms AHL-induced resistance. Macro-/microanalytical evidence indicated AHL regulations on production, spatial distribution, functional groups extracellular polymeric substances were not significant, ruling out partitioning complexation as principal mechanism. Meanwhile, molecular showed upregulated transcriptional levels resistance genes (sod, kat, cysQ, czcC responsible antioxidation defense, sequestration, transport) appreciable extents, indicating intracellular primary This study yielded mechanistic understanding regulatory roles consortia, providing fundamental basis utilizing QS regulation efficient wastewaters with metal

Language: Английский

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A novel process based on marine heterotrophic nitrification and aerobic denitrification bacteria for treating mariculture wastewater: Performance, biofilm characteristics and microbiome responses to dissolved oxygen

Aquaculture, Journal Year: 2024, Volume and Issue: 595, P. 741498 - 741498

Published: Aug. 17, 2024

Language: Английский

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