DOI: 10.1016/j.watres.2017.11.066
Scopus记录号: 2-s2.0-85037353760
论文题名: Enhanced sludge solubilization and dewaterability by synergistic effects of nitrite and freezing
作者: Sun F. ; Xiao K. ; Zhu W. ; Withanage N. ; Zhou Y.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 130 起始页码: 208
结束页码: 214
语种: 英语
英文关键词: Carbon sources
; Dewaterability
; Freezing
; Nitrite
; Waste activated sludge
Scopus关键词: Freezing
; Organic carbon
; Particle size
; Solubility
; Carbon source
; Dewaterability
; Dissolved organic carbon
; Low molecular weight compounds
; Nitrite
; Rheological characteristics
; Sludge solubilization
; Waste activated sludges
; Activated sludge process
; nitrite
; polysaccharide
; nitrite
; activated carbon
; activated sludge
; concentration (composition)
; dewatering
; freezing
; molecular analysis
; nitrite
; organic carbon
; solubilization
; waste technology
; activated sludge
; Article
; bacterial cell
; carbon source
; crystal structure
; feasibility study
; freezing
; molecular weight
; particle size
; priority journal
; scanning electron microscopy
; shear rate
; sludge conditioning
; sludge dewatering
; suspended particulate matter
; temperature
; velocity
; waste water management
; chemistry
; flow kinetics
; pH
; procedures
; sewage
; solubility
; theoretical model
; waste management
; Freezing
; Hydrogen-Ion Concentration
; Models, Theoretical
; Nitrites
; Particle Size
; Rheology
; Sewage
; Solubility
; Waste Management
英文摘要: In this study, nitrite was added into sludge during freezing process to evaluate its role in waste activated sludge (WAS) solubilization and effect on sludge dewatering characteristics. The results showed that the introduction of 100 mg L−1 of nitrite could increase dissolved organic carbon (DOC) concentration from 29.5 to 48.8 mg DOC g−1 VSS under freezing conditions. More DOC was released with the increase of nitrite concentration. Freezing temperature, or freezing speed, also played a role in sludge solubilization. It was found that some readily-biodegradable low molecular weight (LMW) compounds, e.g. LMW protein, LMW polysaccharide, LMW neutrals, building blocks and LMW acids, were mainly released during the freezing process with the presence of nitrite. Interestingly, nitrite could also improve the sludge filterability at the lower nitrite concentration as a result of the increased sludge particle size. However, electrolytes (sodium nitrite) addition effects may mask such enhancement when nitrite concentration was high (800 mg L−1). The rheological characteristics of sludge could be well modeled by Herchel-Bulkley model and the introduction of nitrite into freezing process further increased sludge flowability and decreased sludge viscosity. These results indicated that freezing with the presence of suitable concentration of nitrite could promote sludge solubilization and dewaterability. As such, good liquid and solid separation can be achieved with the recovery of liquid stream as carbon source. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113044
Appears in Collections: 气候减缓与适应
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作者单位: School of Civil and Environmental Engineering, Nanyang Technological University639798, Singapore; Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University637141, Singapore
Recommended Citation:
Sun F.,Xiao K.,Zhu W.,et al. Enhanced sludge solubilization and dewaterability by synergistic effects of nitrite and freezing[J]. Water Research,2018-01-01,130