Comprehensive Analysis of Oxidation Ditch and High-Efficiency Multi-Cycle A2/O Processes Performance in Urban Wastewater Treatment

Water, Год журнала: 2025, Номер 17(5), С. 713 - 713

Опубликована: Фев. 28, 2025

Oxidation ditch and Anaerobic–Anoxic–Oxic (A2/O) processes have been applied in urban wastewater treatment plants for decades, but the differences between two engineering applications are less studied. Based on continuous monitoring of Ningyang’s sewage plant (Shandong, China) one year, this study systematically analyzed removal efficiencies nutrients oxidation modified high-efficiency multi-cycle A2/O processes. The results showed that chemical oxygen demand (COD) total phosphorus (TP) process Phase II project was better than I project, average concentration COD TP effluent 49.9% 51.7% lower process, respectively. rate ammonia nitrogen (NH4+-N) by basically same, while (TN) 31.4% process. In summary, had a performance regarding nutrient under same conditions. Furthermore, operational costs were lower.

Язык: Английский

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Formation and Characterization of Aerobic Granular Sludge in the Treatment of Tempering Lubricant Wastewater by Hydrolysis Acidification-Aerobic Process

Environmental Engineering Science, Год журнала: 2025, Номер unknown

Опубликована: Март 26, 2025

Язык: Английский

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Characteristics, Performance and Microbial Response of Aerobic Granular Sludge for Treating Tetracycline Hypersaline Pharmaceutical Wastewater

Microorganisms, Год журнала: 2024, Номер 12(6), С. 1173 - 1173

Опубликована: Июнь 9, 2024

Salt-tolerant aerobic granular sludge(AGS) was successfully cultivated under the dual stress of tetracycline and 2.5% salinity, resulting in an average particle size 435.0 ± 0.5 exhibiting a chemical oxygen demand(COD) removal rate exceeding 80%, as well excellent sedimentation performance. The analysis metagenomics technology revealed significant pattern succession development AGS. proportion Oleiagrimonas, type salt-tolerant bacteria, exhibited gradual increase reached 38.07% after 42 days, which indicated that AGS system based on moderate halophilic bacteria constructed. expression levels targeted genes were found to be reduced across entire process formation, evidenced by qPCR analysis. presence int1 (7.67 log10 gene copies g−1 0 d sludge sample) enabled microbes horizontally transfer ARGs along formation double pressure TC salinity. These findings will enhance our understanding ARG profiles pressure, providing foundation for guiding use treat hypersaline pharmaceutical wastewater.

Язык: Английский

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Effect of settling time and organic loading rates on aerobic granulation processes treating high strength wastewater

Heliyon, Год журнала: 2024, Номер 10(16), С. e36018 - e36018

Опубликована: Авг. 1, 2024

Despite its numerous advantages, the aerobic granular sludge (AGS) process faces several challenges that hinder widespread implementation. One such challenge is requirement for high organic load ratios (OLR), which significantly impacts AGS formation and stability, posing a barrier to commercialization. In response these challenges, this study investigates granulation treatment efficacy of treating high-concentration wastewater under various OLR settling time. Three sequential batch reactors (R1, R2, R3) were operated at OLRs 0.167, 0.33, 1 kg COD/m3·day. The focuses on analyzing key parameters including characteristics, extracellular polymeric substances (EPS) content, PN/PS ratio, microbial clusters. Results demonstrate reducing time from 90 30 min enhances settleability, resulting in maximum 50.8 % decrease SVI30 (from 98.1 122.8 mL/g 51.9–81.3 mL/g), thereby facilitating selection beneficial microorganisms during granulation. Particularly, ratio was 4.3, EPS content increased by 1.52-fold, leading 1.41-fold increase attachment. This observation suggests progressive maturation AGS. Additionally, analysis diversity cluster composition highlights influence variations Proteobacteria Bacteroidetes. These findings emphasize significant impact SBR operational strategies performance biological offering valuable insights efficient operation future processes.

Язык: Английский

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Promotion of polyhydroxyalkanoates-producing granular sludge formation by lactic acid using anaerobic dynamic feeding process

Journal of Biotechnology, Год журнала: 2024, Номер unknown

Опубликована: Сен. 1, 2024

Язык: Английский

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Enhancing Wastewater Treatment with Aerobic Granular Sludge: Impacts of Tetracycline Pressure on Microbial Dynamics and Structural Stability

Microorganisms, Год журнала: 2024, Номер 12(9), С. 1913 - 1913

Опубликована: Сен. 20, 2024

This study evaluated the efficiency of aerobic granular sludge (AGS) technology in treating wastewater contaminated with tetracycline (TC), a common antibiotic. AGS was cultivated under TC pressure gradient ranging from 5 mg/L to 15 and compared conventional conditions. The results demonstrated that achieved high removal efficiencies exhibited robust sedimentation performance, significant differences average particle sizes observed both conditions (618.6 μm vs. 456.4 conditions). Importantly, exposure found alter composition production extracellular polymeric substances (EPSs), thereby enhancing structural integrity functional stability AGS. Additionally, selective induced shifts microbial community composition; Rhodanobacter played crucial role EPS biological aggregation, metabolic AGS, while Candida tropicalis remarkable resilience nutrient stressful environmental These findings underscore potential as promising solution for advancing treatment methods, thus contributing protection sustainability amid growing concerns over antibiotic contamination.

Язык: Английский

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Effect of Settling Time and Organic Loading Rates on Aerobic Granulation Processes Treating High Strength Wastewater

Опубликована: Янв. 1, 2024

Despite its numerous advantages, the aerobic granular sludge (AGS) process faces several challenges that hinder widespread implementation. One such challenge is requirement for high organic load ratios (OLR), which significantly impacts AGS formation and stability, posing a barrier to commercialization. In response these challenges, this study investigates granulation treatment efficacy of treating high-concentration wastewater under OLR. Three sequential batch reactors (R1, R2, R3) were operated at OLRs 0.167, 0.33, 1 kg COD/m3·day. The focuses on analyzing key parameters including characteristics, extracellular polymeric substances (EPS) content, PN/PS ratio, microbial clusters. Results demonstrate reducing settling time from 90 30 minutes enhances settleability, resulting in maximum 50.8% decrease SVI (from 98.1-122.8 mL/mg SS 51.9-81.3 SS), thereby facilitating selection beneficial microorganisms during granulation. Particularly, ratio was 4.3, EPS content increased by 1.52-fold, leading 1.41-fold increase attachment. This observation suggests progressive maturation AGS. Additionally, analysis diversity cluster composition highlights influence OLR variations Proteobacteria Bacteroidetes. These findings emphasize significant impact SBR operational strategies performance biological offering valuable insights efficient operation future processes.

Язык: Английский

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Significantly accelerated aerobic granulation using Ca(ClO)2 hydrothermally pretreating sludge

Journal of Water Process Engineering, Год журнала: 2024, Номер 65, С. 105858 - 105858

Опубликована: Июль 26, 2024

Язык: Английский

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Aerobic granular sludge enhances start-up and granulation in single-stage partial nitritation anammox granular sludge systems: Performance, mechanism, and shifts in bacterial communities

Bioresource Technology, Год журнала: 2024, Номер 416, С. 131760 - 131760

Опубликована: Ноя. 6, 2024

Язык: Английский

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