DOI: 10.1016/j.watres.2018.12.019
Scopus记录号: 2-s2.0-85059001021
论文题名: Thiothrix eikelboomii interferes oxygen transfer in activated sludge
作者: Wu X. ; Huang J. ; Lu Z. ; Chen G. ; Wang J. ; Liu G.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 134
结束页码: 143
语种: 英语
英文关键词: Activated sludge
; Filamentous bulking
; Oxygen transfer
; Thiothrix
; Wastewater treatment
Scopus关键词: Activated sludge process
; Bacteria
; Binary alloys
; Liquid films
; Sewage sludge
; Viscosity
; Wastewater treatment
; Activated sludge
; Biomass concentrations
; Extra-cellular polymeric substances
; Filamentous bulking
; Filamentous bulking sludges
; Oxygen transfer
; Thiothrix
; Volumetric oxygen transfer coefficient
; Oxygen
; oxygen
; polysaccharide
; protein
; surfactant
; activated sludge
; bacterium
; coating
; concentration (composition)
; film
; ion exchange
; oxygen
; polymer
; polysaccharide
; protein
; viscosity
; wastewater treatment
; activated sludge
; Article
; confocal laser scanning microscopy
; hydrophobicity
; microbial community
; nonhuman
; oxygen transport
; priority journal
; sludge settling
; surface property
; Thiothrix
; Thiothrix eikelboomii
; viscometry
; viscosity
; waste water management
; Bacteria (microorganisms)
; Thiothrix
; Thiothrix eikelboomii
英文摘要: This study revealed that, Thiothrix eikelboomii, a well-known filamentous bacterium that causes sludge bulking, could also interfere oxygen transfer during wastewater treatment. The volumetric oxygen transfer coefficient (KLa) in filamentous-bulking sludge (FBS) was found to be 43% lower than that in floc-forming sludge (FFS) at similar biomass concentrations, partially because the filamentous bacteria had increased the sludge apparent viscosity. The KLa value for FBS, however, was still significantly lower than that for FFS even if both sludges had similar apparent viscosity. Numerous tiny and free-swimming filaments were observed to attach on the air bubble surface, presumably reducing the liquid film renewal and increasing the liquid film thickness. Moreover, the filaments were co-coated with extracellular polymeric substances of protein and polysaccharide, which could make them performing like “amphiphilic molecules” of surfactants to hinder oxygen transfer. Therefore, the particular surface property of filaments and their interaction with air bubbles could also impact oxygen transfer. Thiothrix eikelboomii was identified to be the responsible filamentous bacterium that lowered the KLa value, while other filamentous bacteria with short filaments did not interfere oxygen transfer. This study implies that controlling sludge bulking benefits not only sludge settling but also oxygen transfer. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122064
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: School of Environment, Guangdong Engineering Research Center of Water Treatment Processes and Materials, And Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou, 510632, China; Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO 65409, United States
Recommended Citation:
Wu X.,Huang J.,Lu Z.,et al. Thiothrix eikelboomii interferes oxygen transfer in activated sludge[J]. Water Research,2019-01-01