DOI: 10.1016/j.watres.2018.02.013
Scopus记录号: 2-s2.0-85042210328
论文题名: Characterization of a new continuous gas-mixing sulfidogenic anaerobic bioreactor: Hydrodynamics and sludge granulation
作者: Wang B. ; Wu D. ; Ekama G.A. ; Tsui T.-H. ; Jiang F. ; Chen G.-H.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 135 起始页码: 251
结束页码: 261
语种: 英语
英文关键词: Continuous gas recirculation
; Sludge flotation minimization
; Sludge granulation
; Sludge properties
; Sulfidogenic upflow sludge bed
Scopus关键词: Flotation
; Granulation
; Mass transfer
; Shear flow
; Sulfur compounds
; Anaerobic bioreactors
; Extra-cellular polymeric substances
; Gas recirculations
; Lower-power consumption
; Negative zeta potentials
; Sludge properties
; Sulfate reducing bacteria
; Sulfidogenic upflow sludge bed
; Mixing
; Article
; continuous gas recirculation
; gas
; gas mixing
; hydrodynamics
; hydrophobicity
; polymerization
; priority journal
; shear rate
; sludge
; sulfate reducing bacterium
; surface property
; viscosity
; zeta potential
; anaerobic growth
; bacterium
; bioreactor
; chemical phenomena
; chemistry
; devices
; metabolism
; microbiology
; procedures
; sewage
; sulfate
; Anaerobiosis
; Bacteria
; Bioreactors
; Hydrodynamics
; Hydrophobic and Hydrophilic Interactions
; Sewage
; Sulfates
; Waste Disposal, Fluid
英文摘要: Continuous gas recirculation (CGR) was demonstrated in this study to be an effective method to mitigate the persistent problem of sludge flotation in high-rate sulfate-reducing upflow sludge bed (SRUSB) reactors that do not produce much gas. The effects of hydraulic- and CGR-mixing on the mixing regime of the SRUSB reactors were investigated over a period of 45 d at the average shear rates of 0.9, 1.5, 2.7, 4.2 and 7.2 s−1 (Phase I). CGR-mixing at 4.2 s−1 resulted in the smallest reactor short-circuiting flow of 1.3 ± 0.1% and the smallest dead zone volume of 0.2 ± 0.01% at a lower power consumption (0.0007 W) than hydraulic mixing. In Phase II, the SRUSB reactor with CGR-mixing at 4.2 s−1 was re-inoculated and operated for 150 days. Within the first 65 days, the sludge transformed into micro-granules (300–350 μm) with a high sulfate-reducing bacteria (SRB) activity (0.62 ± 0.05 g COD/(g MLVSS·day)), a low sludge flotation potential (<20%) and a high settleability (SVI5/SVI30 < 1.3). These results are attributed to the following sludge properties: (i) a low ratio of loosely-bound to tightly-bound extracellular polymeric substances (0.06–0.1), (ii) weakly adhesive surface properties as demonstrated by a strongly negative zeta potential (−23 ± 2 mV), a low hydrophobicity (37 ± 3%) and a low viscosity (0.7 ± 0.1 mPa s), and (iii) small size granules resulting in strong mass transfer (sulfate and COD penetration into the granule core) and a homogeneous structure (SRB detected throughout the granule). © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112889
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil and Environmental Engineering, Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution (Hong Kong Branch), Water Technology Center, The Hong Kong University of Science and Technology, Hong Kong, Hong Kong; Wastewater Treatment Laboratory, FYT Graduate School, The Hong Kong University of Science and Technology, Guangzhou, China; Water Research Group, Department of Civil Engineering, University of Cape Town, Cape Town, South Africa; School of Chemistry and Environment, South China Normal University, Guangzhou, China
Recommended Citation:
Wang B.,Wu D.,Ekama G.A.,et al. Characterization of a new continuous gas-mixing sulfidogenic anaerobic bioreactor: Hydrodynamics and sludge granulation[J]. Water Research,2018-01-01,135