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Effects of hydrodynamic shear stress on sludge properties, N2O generation, and microbial community structure during activated sludge process
Yan, Xu; Zheng, Shikan; Yang, Jie; Ma, Jiahui; Han, Yunping; Feng, Jinglan; Su, Xianfa; Sun, Jianhui
2020-11-15
Source PublicationJOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN0301-4797
Volume274Pages:1-11
AbstractSludge properties are critical to the treatment performance and potentially correlate with nitrous oxide (N2O) generation during activated sludge processes. The hydrodynamic shear stress induced by aeration has a significant influence on sludge properties and is inevitable for wastewater treatment plants (WWTPs). In this study, the effects of aerobic induced hydrodynamic shear stress on sludge properties, N2O generation, and microbial community structure were investigated using three parallel sequencing batch reactors (SBRs) with identical dissolved oxygen (DO) concentrations. Results showed that with a shear stress increase from 1.5 x 10(-2) N/m(2) to 5.0 x 10(-2) N/m(2), the COD and NH4+-N removal rates were enhanced from 89.4% to 94.0% and from 93.9% to 98.0%, respectively, while the TN removal rate decreased from 66.0% to 56.5%. Settleability of the activated sludge flocs (ASFs) also increased with the enhancement of shear stress, due to variation in sludge properties including particle size, regularity, compactibility, and EPS (extracellular polymeric substances) composition. The increase in shear stress promoted oxygen diffusion within the ASFs and mitigated NO2--N accumulation, leading to a decrease in the N2O-N conversion rate from (4.8 +/- 0.3)% to (2.2 +/- 0.6)% (based on TN removal). Microbial analysis results showed that the functional bacteria involved in the biological nitrogen removal was closely related with shear stress. The increase in shear stress favored the enrichment of nitrite oxidizing bacteria (NOB) while suppressed the accumulation of ammonia-oxidizing bacteria (AOB) and denitrifying bacteria (DNB).
Department水污染控制实验室
KeywordWastewater treatment Activated sludge process Sludge properties Nitrous oxide Microbial community structure
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/45030
Collection水污染控制实验室
Recommended Citation
GB/T 7714
Yan, Xu,Zheng, Shikan,Yang, Jie,et al. Effects of hydrodynamic shear stress on sludge properties, N2O generation, and microbial community structure during activated sludge process[J]. JOURNAL OF ENVIRONMENTAL MANAGEMENT,2020,274:1-11.
APA Yan, Xu.,Zheng, Shikan.,Yang, Jie.,Ma, Jiahui.,Han, Yunping.,...&Sun, Jianhui.(2020).Effects of hydrodynamic shear stress on sludge properties, N2O generation, and microbial community structure during activated sludge process.JOURNAL OF ENVIRONMENTAL MANAGEMENT,274,1-11.
MLA Yan, Xu,et al."Effects of hydrodynamic shear stress on sludge properties, N2O generation, and microbial community structure during activated sludge process".JOURNAL OF ENVIRONMENTAL MANAGEMENT 274(2020):1-11.
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