DOI: 10.1016/j.watres.2017.12.007
Scopus记录号: 2-s2.0-85037671482
论文题名: Understanding the impact of cationic polyacrylamide on anaerobic digestion of waste activated sludge
作者: Wang D. ; Liu X. ; Zeng G. ; Zhao J. ; Liu Y. ; Wang Q. ; Chen F. ; Li X. ; Yang Q.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 130 起始页码: 281
结束页码: 290
语种: 英语
英文关键词: Anaerobic digestion
; Cationic polyacrylamide
; Methane production
; Waste activated sludge
Scopus关键词: Amides
; Carboxylic acids
; Degradation
; Hydrogels
; Hydrolysis
; Methane
; Sludge digestion
; Solubility
; Biochemical methane potential
; Cationic polyacrylamides
; Degradation metabolites
; Methane production
; Sludge solubilization
; Total suspended solids
; Volatile suspended solids
; Waste activated sludges
; Anaerobic digestion
; acrylamide
; acrylic acid
; carbohydrate
; methane
; polyacrylamide
; polyacrylic acid
; protein
; acrylic acid derivative
; acrylic acid resin
; activated sludge
; anaerobic digestion
; degradation
; dose-response relationship
; experimental study
; flocculation
; hydrolysis
; inorganic compound
; methane
; methanogenesis
; solubility
; wastewater treatment
; activated sludge
; anaerobic digestion
; Article
; degradation
; enzyme activity
; hydrolysis
; infrared spectroscopy
; methanogenesis
; priority journal
; solubilization
; waste water
; anaerobic growth
; metabolism
; procedures
; sewage
; Acrylates
; Acrylic Resins
; Anaerobiosis
; Hydrolysis
; Methane
; Sewage
; Waste Disposal, Fluid
英文摘要: Previous investigations showed that cationic polyacrylamide (cPAM), a flocculant widely used in wastewater pretreatment and waste activated sludge dewatering, deteriorated methane production during anaerobic digestion of sludge. However, details of how cPAM affects methane production are poorly understood, hindering deep control of sludge anaerobic digestion systems. In this study, the mechanisms of cPAM affecting sludge anaerobic digestion were investigated in batch and long-term tests using either real sludge or synthetic wastewaters as the digestion substrates. Experimental results showed that the presence of cPAM not only slowed the process of anaerobic digestion but also decreased methane yield. The maximal methane yield decreased from 139.1 to 86.7 mL/g of volatile suspended solids (i.e., 1861.5 to 1187.0 mL/L) with the cPAM level increasing from 0 to 12 g/kg of total suspended solids (i.e., 0–236.7 mg/L), whereas the corresponding digestion time increased from 22 to 26 d. Mechanism explorations revealed that the addition of cPAM significantly restrained the sludge solubilization, hydrolysis, acidogenesis, and methanogenesis processes. It was found that ∼46% of cAPM was degraded in the anaerobic digestion, and the degradation products significantly affected methane production. Although the theoretically biochemical methane potential of cPAM is higher than that of protein and carbohydrate, only 6.7% of the degraded cPAM was transformed to the final product, methane. Acrylamide, acrylic acid, and polyacrylic acid were found to be the main degradation metabolites, and their amount accounted for ∼50% of the degraded cPAM. Further investigations showed that polyacrylic acid inhibited all the solubilization, hydrolysis, acidogenesis, and methanogenesis processes while acrylamide and acrylic acid inhibited the methanogenesis significantly. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113034
Appears in Collections: 气候减缓与适应
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作者单位: College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China; Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia; Griffith School of Engineering & Centre for Clean Environment and Energy, Griffith UniversityQLD, Australia
Recommended Citation:
Wang D.,Liu X.,Zeng G.,et al. Understanding the impact of cationic polyacrylamide on anaerobic digestion of waste activated sludge[J]. Water Research,2018-01-01,130