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• W4280494701 endingPage "136894" @default.
• W4280494701 startingPage "136894" @default.
• W4280494701 abstract "Heterotrophic denitratation coupled with anammox is a high-efficiency and low-cost process to scavenge residual nitrate and ammonium from the mainstream partial nitritation/anammox process. Fermentate derived from the carbon-concentrated sludge, e.g., chemically enhanced high-rate activated sludge (CEHRAS), is a valuable carbon source for heterotrophic denitratation. However, acetate rather than all volatile fatty acids (VFAs) in the fermentate results in high nitrite accumulation. Micro-aeration may be a promising technology to facilitate VFA production and acetate proportion. This study implemented performance comparison and mechanism analyses on two different micro-aeration modes (i.e., continuous and intermittent micro-aeration) of CEHRAS anaerobic fermentation. Batch fermentation tests showed that the low-intensity micro-aeration (4.62 mL/(L·min)) increased 2.2 times of VFA productions compared with unaerated blank. Higher oxygen dosages (7.69 and 15.4 mL/(L·min)) increased acetate proportion though reduced VFA production, largely due to the elimination of hydrogen inhibition in acetogenesis and the facultative consumption strengthen. Further, the intermittent micro-aeration effectively limits the aerobic respiration in the later stage. Moreover, model substrate tests elucidated that micro-aeration accelerated all steps of protein degradation. The long-term beneficial effects of micro-aeration on VFA production (104 vs. 54.3 mg COD/g VSS) and acetate ratio (59.0% vs. 41.0%) were validated by operating sequencing batch reactors with and without micro-aeration, respectively. Additionally, micro-aeration enriched essential functional microorganisms rather than regulated microbial diversity. Model simulations revealed the crucial roles of increasing acetate proportion in fermentate. The intercellular storage process had higher rate constant and substrate affinity based on acetate than other VFAs, which was the main reason for the higher nitrite accumulation of acetate. Thereby, micro-aeration fermentate from CEHRAS is an ideal carbon source in heterotrophic denitratation." @default.
• W4280494701 created "2022-05-22" @default.
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• W4280494701 date "2022-10-01" @default.
• W4280494701 modified "2023-09-30" @default.
• W4280494701 title "Micro-aerated fermentation enhances acetate production from high-rate activated sludge to supply carbon source for heterotrophic denitratation" @default.
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• W4280494701 doi "https://doi.org/10.1016/j.cej.2022.136894" @default.
• W4280494701 hasPublicationYear "2022" @default.
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