title: Biodegradation of polyacrylamide by anaerobic digestion under mesophilic condition and its performance in actual dewatered sludge system.
abstract: Polyacrylamide (PAM) used in sludge dewatering widely exists in high-solid anaerobic digestion. Degradation of polyacrylamide accompanied with accumulation of its toxic monomer is important to disposition of biogas residues. The potential of anaerobic digestion activity in microbial utilization of PAM was investigated in this study. The results indicated that the utilization rate of PAM (as nitrogen source) was influenced by accumulation of ammonia, while cumulative removal of amide group was accorded with zeroth order reaction in actual dewatered system. The adjoining amide group can combined into ether group after biodegradation. PAM can be broken down in different position of its carbon chain backbone. In actual sludge system, the hydrolytic PAM was liable to combined tyrosine-rich protein to form colloid complex, and then consumed as carbon source to form monomer when easily degradable organics were exhausted. The accumulation of acrylamide was leveled off ultimately, accompanied with the yield of methane.
authors.affiliation: National Engineering Research Center for Urban Pollution Control, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China.
authors.forename: Xiaohu
authors.initials: X
authors.lastname: Dai
authors.affiliation: National Engineering Research Center for Urban Pollution Control, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China.
authors.forename: Fan
authors.initials: F
authors.lastname: Luo
authors.affiliation: National Engineering Research Center for Urban Pollution Control, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Yi
authors.affiliation: National Engineering Research Center for Urban Pollution Control, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China.
authors.forename: Qunbiao
authors.initials: Q
authors.lastname: He
authors.affiliation: National Engineering Research Center for Urban Pollution Control, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China. Electronic address: tj_dongbin@163.com.
authors.forename: Bin
authors.initials: B
authors.lastname: Dong
mesh_terms: D000143:Acids; D000180:Acrylic Resins / Q000378:metabolism*; D000693:Anaerobiosis / Q000187:drug effects; D061249:Batch Cell Culture Techniques; D001673:Biodegradation, Environmental / Q000187:drug effects; D019149:Bioreactors / Q000382:microbiology; D001709:Biotechnology / Q000379:methods*; D002244:Carbon / Q000494:pharmacology; D003102:Colloids; D005232:Fatty Acids, Volatile / Q000032:analysis; D005285:Fermentation / Q000187:drug effects; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis / Q000187:drug effects; D008697:Methane / Q000378:metabolism; D009584:Nitrogen / Q000494:pharmacology; D010316:Particle Size; D012722:Sewage / Q000382:microbiology*; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry*; D000099166:Polyacrylamides
chemical_list: D000143:Acids; D000180:Acrylic Resins; D002244:Carbon; D003102:Colloids; D005232:Fatty Acids, Volatile; D008697:Methane; D009584:Nitrogen; D012722:Sewage; D014867:Water; D000099166:Polyacrylamides
keywords: Anaerobic digestion; Biodegradation; High-solid; Polyacrylamide