DOI: 10.1016/j.watres.2018.04.002
Scopus记录号: 2-s2.0-85047433842
论文题名: Quantitative characterization and analysis of granule transformations: Role of intermittent gas sparging in a super high-rate anaerobic system
作者: Tsui T.-H. ; Ekama G.A. ; Chen G.-H.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 139 起始页码: 177
结束页码: 186
语种: 英语
英文关键词: Anaerobic bioreactor
; Biofilm
; Granular sludge
; Intermittent gas sparging
; Surface characterization
; UASB
Scopus关键词: Bioconversion
; Biofilms
; Bioreactors
; Gases
; Granulation
; Image processing
; Knowledge management
; Microstructure
; Scanning electron microscopy
; Surface properties
; Anaerobic bioreactors
; Gas sparging
; Granular sludge
; Surface characterization
; UASB
; Loading
; anoxic conditions
; biochemical oxygen demand
; biofilm
; bioreactor
; biotransformation
; growth
; microbial community
; microbial ecology
; quantitative analysis
; sludge
; Article
; biomass
; confocal laser scanning microscopy
; granule transformation
; image processing
; intermittent gas sparging
; physical phenomena
; priority journal
; quantitative analysis
; scanning electron microscopy
; sparging
; surface area
; surface property
; anaerobic growth
; bioreactor
; microbiology
; procedures
; sewage
; Anaerobiosis
; Biomass
; Bioreactors
; Waste Disposal, Fluid
英文摘要: Knowledge of leveraging biomass characteristics is essential for achieving a microbial community with a desired structure to optimize anaerobic bioreactor performance. This study investigates the successive granule transformations in a high-rate anaerobic system with intermittent gas sparging and sequential increases in organic loading rates (OLRs), by establishing the correlations between the granule microstructures and reactor operating parameters. Over the course of a 196-day lab-scale trial, the granules were visualized in various stages using scanning electron microscopy, and digital image processing was applied for further quantifying their surface properties. Correlation analyses revealed that irregularities of the granule microstructures (surface properties, specific surface area and pore volume) emerged at stage 4 when the OLR was 13.31 kg COD/m3·day and in stage 5 in the absence of gas sparging. The loading ratio (substrate surface loading to upward velocity) was identified to be the main parameter controlling the granule transformations, and the surface structures were classified into three categories for further interpretation. Confocal laser scanning microscopy analyses showed that the granule core started to hollow out from stage 4. It is also found that a rough granule surface helped accelerate the growth of the granular diameter under gas sparging. Overall, this study not only establish quantitative correlations between the granules microstructures and reactor operating parameters, but also shed light on the use of intermittent gas sparging to control the surface properties of anaerobic granules in high-rate anaerobic bioreactors. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112740
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, Hong Kong; Water Technology Center, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, Hong Kong; Hong Kong Branch of Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, Hong Kong; Water Research Group, Department of Civil Engineering, University of Cape Town, Cape Town, South Africa; Fok Ying Tung Research Institute, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, Hong Kong
Recommended Citation:
Tsui T.-H.,Ekama G.A.,Chen G.-H.. Quantitative characterization and analysis of granule transformations: Role of intermittent gas sparging in a super high-rate anaerobic system[J]. Water Research,2018-01-01,139