DOI: 10.1016/j.watres.2018.09.061
Scopus记录号: 2-s2.0-85054589452
论文题名: Impact of food-to-microorganisms ratio on the stability of aerobic granular sludge treating high-strength organic wastewater
作者: Hamza R.A. ; Sheng Z. ; Iorhemen O.T. ; Zaghloul M.S. ; Tay J.H.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 147 起始页码: 287
结束页码: 298
语种: 英语
英文关键词: Aerobic granular sludge
; Food-to-microorganism ratio
; High-strength organic wastewater
; Microbial diversity
; Wastewater treatment
英文摘要: This work investigated the long-term stability of aerobic granular sludge treating high-strength organic wastewater in a semi-pilot scale sequential batch reactor (SBR). The reactor was operated for 316 days under different operational conditions. It was found that the F/M ratio is an important parameter affecting granules formation and stability. Three selection mechanisms were investigated: (1) cultivation and maturation at moderately high influent COD concentration (2500 mg/L) followed by increase in influent COD concentration to 7500 mg/L; (2) stressed cultivation and operation at high influent COD concentration of 4500 mg/L; and (3) alternate feed loading strategy (variable influent COD concentration across the daily schedule of cycles at 50%, 75%, and 100% of the peak concentration of 5000 mg/L). It was found that adopting high OLR at the reactor start-up accelerated the formation of granules. However, the overgrowth of biomass under high organics concentration negatively affected the stability of granules and led to disintegration due to the presence of methanogens in the granule core. Cultivation at high organics concentration resulted in a rapid loss of microbial diversity and reactor failure. Under alternate feed loading, adequate selection of microbial community was maintained and resulted in stable reactor performance. Moreover, a strong correlation between F/M ratio and the granules settling ability was observed. When F/M ratio exceeded 1.5 gCOD/gSS.d, granules showed poor settleability and under very high sludge loading rates (above 2.5), sludge bulking occurred and led to washout of sludge due to the strong selection pressure of short settling time. Operating the reactor at F/M ratio of 0.5–1.4 gCOD/gSS.d appears to favor stable long-term granule stability. © 2018 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112370
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil Engineering, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
Recommended Citation:
Hamza R.A.,Sheng Z.,Iorhemen O.T.,et al. Impact of food-to-microorganisms ratio on the stability of aerobic granular sludge treating high-strength organic wastewater[J]. Water Research,2018-01-01,147