Response of VFAs Produced by Kitchen Waste Fermentation to Intermittent pH Regulation and Enhanced Denitrification Efficiency

Water, Journal Year: 2025, Volume and Issue: 17(8), P. 1157 - 1157

Published: April 13, 2025

To investigate the effects of intermittent pH regulation on volatile fatty acid (VFA) production during kitchen waste fermentation and its impact nitrogen removal efficiency in anaerobic/anoxic/oxic (A2O) process, five experimental groups were set up (pH = 3, 5, 7, 9, control). The study examined promotion soluble chemical oxygen demand (SCOD) VFA release under different conditions their contribution to total (TN) release. Additionally, methanol was used as a control carbon source explore enhancement denitrification when broth A2O process. results indicated that neutral alkaline could enhance SCOD conversion VFAs, with more pronounced effect conditions. maximum concentrations VFAs reached 36,412 5947 mg/L, respectively. Furthermore, TN most significant conditions, being 2.39 times group. When source, Proteobacteria Bacteroidota significantly enriched. relative abundance key functional genes (napA, norB, nosZ) involved cycling enzymes ([EC: 1.7.1.15], [EC: 1.7.2.1], 1.7.2.5]) enhanced, which strengthened performance.

Language: Английский

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Ecological Shifts and Functional Adaptations of Soil Microbial Communities Under Petroleum Hydrocarbon Contamination

Water, Journal Year: 2025, Volume and Issue: 17(8), P. 1216 - 1216

Published: April 18, 2025

Petroleum hydrocarbon contamination has emerged as a significant global environmental issue, severely impacting soil microbial communities and their functions. This study employed high-throughput sequencing to systematically analyze the bacterial community structure functional genes in soils with varying levels of petroleum contamination. The results demonstrated that led decline diversity, while enhancing abundance specific genes, such those involved polycyclic aromatic (PAH) degradation, methane production, denitrification. Phylogenetic analysis further revealed highly contaminated tended form clustered specialized groups, simultaneously promoting coexistence phylogenetically distant microorganisms. Mantel test identified correlations between ammonium ion concentration, moisture content, metabolic pathways, particularly related degradation These findings suggest not only disrupts carbon nitrogen metabolism balance but also profound implications for greenhouse gas emissions cycling, potentially destabilizing ecosystem. provides novel insights into ecological functions petroleum-contaminated highlights potential key factors pollution management restoration.

Language: Английский

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Simultaneous Nitrification and Denitrification in the Treatment of Expressway Service Sewage Using the Sbbr System at Varying Aeration Rates: Transitioning from Simple to Complex Interspecies Relationships

Published: Jan. 1, 2024

Language: Английский

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Simultaneous nitrification and denitrification in the treatment of expressway service sewage using the SBBR system at varying aeration rates: Transitioning from simple to complex interspecies relationships

Journal of Water Process Engineering, Journal Year: 2024, Volume and Issue: 68, P. 106474 - 106474

Published: Nov. 6, 2024

Language: Английский

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