Disinfection-residual bacteria (DRB) after chlorine dioxide treatment: Microbial community structure, regrowth potential, and secretion characteristics

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 476, P. 135136 - 135136

Published: July 8, 2024

Language: Английский

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Construction of a microalgal-fungal spore co-culture system for the treatment of wastewater containing Zn(II) and estrone: Pollutant removal and microbial biochemical reactions

Journal of Environmental Management, Journal Year: 2025, Volume and Issue: 375, P. 124221 - 124221

Published: Feb. 1, 2025

Language: Английский

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Coupling Anaerobic–Oxic and Integrated Fixed–Activated Sludge Processes for Removal and Transformation of Refractory Organic Matter in Livestock and Poultry Digestate

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

Published: April 16, 2025

Abstract Effective treatment of livestock and poultry digestate remains challenging due to its high content refractory organic matter. In this study, a coupled anaerobic–oxic (A/O) integrated fixed–film activated sludge (IFAS) system was investigated evaluate capacity for removal molecular transformation. The IFAS outperformed the A/O system, achieving an efficiency 43%, compared 17% in process. Molecular analyses revealed distinct transformation pathways: process tended increase weight structural complexity dissolved matter, whereas promoted oxidative fragmentation, resulting formation smaller, oxygen–rich compounds. These changes were reflected key indices (DBE, NOSC, AI mod ) accumulation carboxyl–rich intermediates. Microbial community analysis associated Bacteroidota with degradation oxygenated compounds via hydrolytic processes, while Actinobacteria Deinococcota linked lignin– derived aromatics. integration advanced characterization microbial profiling highlights system’s enhanced capability both simplification biodegradation complex organics, providing promising strategy high–strength wastewater.

Language: Английский

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Effect of Extraction Temperature on Value-Added Biopolymer Recovery In Waste Activated Sludge

Published: Jan. 1, 2025

Language: Английский

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Water Quality Assessment and Aeration Optimization of Wastewater Aeration Tanks Based on CFD Coupled with the ASM2 Model

Water, Journal Year: 2025, Volume and Issue: 17(6), P. 875 - 875

Published: March 18, 2025

High energy consumption and low aeration efficiency remain significant challenges in wastewater treatment. This study introduces a computational method that integrates the activated sludge model with Fluent (2021) to comprehensively simulate internal operations of tanks, enabling accurate modeling biochemical mass transfer processes. Hydraulic retention times were analyzed using streamlined patterns, while low-velocity flow regions identified across cross-sectional planes. The systematically evaluated key water quality indicators, including dissolved oxygen, chemical oxygen demand (COD), total phosphorus (TP), nitrogen (TN), ammonium (NH4+-N), tank. A novel metric was proposed quantify purification per unit volume. Four optimized schemes designed tested, incorporating microbubble improve dynamics. achieved 28% reduction maintaining losses for COD, TP, TN, NH4+-N below 8%. An alternative scheme reduced volume by 16%, limiting 5.5%. work offers practical insights into optimizing treatment systems, providing data-driven strategies enhancing meeting stringent effluent standards.

Language: Английский

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Effect of extraction temperature on value-added biopolymer recovery in waste activated sludge

Water Cycle, Journal Year: 2025, Volume and Issue: unknown

Published: March 1, 2025

Language: Английский

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Effects of High Salinity on Nitrogen Removal Efficiency and Microbial Community Structure in a Three-Stage AO System

Water, Journal Year: 2025, Volume and Issue: 17(8), P. 1112 - 1112

Published: April 8, 2025

This study investigated the nitrogen removal performance of a three-stage AO reactor for refractory TN and changes in microbial community structure within activated sludge system under varying sodium chloride concentration conditions. Under an influent 0 g/L with sufficient carbon source, rates Total Nitrogen (TN), Chemical Oxygen Demand (CODcr), Ammonium (NH4+-N) remained stable at 98%, 99.7%, 99.9%, respectively. When increased to 20 g/L, activity AOB was significantly inhibited, efficiency dropping 83%, 89%, 70%, respectively, NAR increasing 91.97%. Analytical results demonstrated that both ammonia-oxidizing bacteria (AOB) nitrite-oxidizing (NOB) exhibited inhibited metabolic activities, NOB experiencing earlier functional impairment. NaCl concentrations ≤ 10 conventional via nitrification–denitrification (ND) dominant. exceeded due accumulation NO2−-N, phyla Planctomycetota Proteobacteria maintained dominance community, while partial nitrification (PN) denitrification pathways gradually replaced ND. Extracellular polymeric substance (EPS) secretion emerged as primary defense mechanism against salinity stress. Experimental findings informed proposed strategies including phased acclimatization salt-tolerance enhancement, EPS production regulation, targeted enrichment consortia, which collectively improved by 18.7–22.3% levels g/L. provides theoretical foundations technical references process optimization hypersaline industrial wastewater treatment systems.

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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Bioelectricity Drives Transformation of Nitrogen and Perfluorooctanoic Acid in Constructed Wetlands: Performances and Mechanisms

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 480, P. 135891 - 135891

Published: Sept. 24, 2024

Language: Английский

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Increased Toxicity toward Mammalian Cells in the Periodate Oxidation Process of Wastewater: The Overlooked Formation of Noniodinated but Nitrogenous Byproducts

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

Published: Dec. 5, 2024

Periodate (PI) shows promising potential as an oxidant for wastewater treatment; however, its impact on the toxicity of remains unknown. Here, we found that with 100 μM PI addition, cytotoxicity increased from 4.8 to 7.6 mg-Phenol/L 9.5 12.8 mg-Phenol/L, and genotoxicity 0.3 0.9 μg-4-NQO/L. Interestingly, hypoiodous acid (HOI) was not detected during reaction, there no observed increase in concentration total organic iodine (TOI). CHON components dissolved matter changed most obviously oxidation, which might serve primary precursors toxic byproducts. Cytotoxicity typical nitrogen-containing tryptophan, lysine, phenylalanine, tyrosine after oxidation 14.7, 2.4, 4.1, 3.2 respectively. four nonhalogenated aromatic nitrogenous byproducts (N-DBPs) 3-hydroxyquinoline, 4-hydroxyquinoline, benzopyridine, benzopyrrole were confirmed using standards, such 2-formylbenzonitrile tentatively proposed. The comparable those known N-DBPs nitrosamines, suggesting attention should be given these but two PI-treated samples concentrations 0.8, 0.98, 0.52, 0.0038, 18.28, 1.50, 0.57, 0.0074 μg/L, respectively, contributions less than 1.5% overall cytotoxicity. Further investigations are warranted elucidate drivers wastewater.

Language: Английский

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