title: Kinetics of phenolic and phthalic acid esters biodegradation in membrane bioreactor (MBR) treating municipal landfill leachate.
abstract: The kinetic of phenolic and phthalic acid esters (PAEs) biodegradation in membrane bioreactor (MBR) treating municipal landfill leachate was investigated. Laboratory-scale MBR was fed with mixture of fresh and stabilized landfill leachate containing carbon to nitrogen (C/N) ratio of 10, 6, 3 and operated under different solid retention time (SRT) of 90, 15 and 5 d. Batch experiments using MBR sludge obtained from each steady-state operating condition revealed highest biodegradation rate constant (k) of 0.059-0.092 h(-1) of the phenolic and PAEs compounds at C/N of 6. Heterotrophic bacteria were the major group responsible for biodegradation of compounds whereas the presence of ammonia-oxidizing bacteria (AOB) helped accelerating their removals. Heterotrophic nitrifying bacteria found under high ammonia condition had an important role in enhancing the biodegradation of phenols and PAEs by releasing phenol hydroxylase (PH), esterase (EST) and phthalate dioxygenase (PDO) enzymes and the presence of AOB helped improving biodegradation of phenolic and PAEs compounds through their co-metabolism.
authors.affiliation: Department of Environmental Engineering, Faculty of Engineering, Kasetsart University, Bangkok, 10900, Thailand.
authors.forename: Jarungwit
authors.initials: J
authors.lastname: Boonnorat
authors.affiliation: Department of Environmental Engineering, Faculty of Engineering, Kasetsart University, Bangkok, 10900, Thailand. Electronic address: fengccc@ku.ac.th.
authors.forename: Chart
authors.initials: C
authors.lastname: Chiemchaisri
authors.affiliation: Department of Environmental Engineering, Faculty of Engineering, Kasetsart University, Bangkok, 10900, Thailand.
authors.forename: Wilai
authors.initials: W
authors.lastname: Chiemchaisri
authors.affiliation: Environmental Science Center, University of Tokyo, Tokyo, 113, Japan.
authors.forename: Kazuo
authors.initials: K
authors.lastname: Yamamoto
mesh_terms: D000641:Ammonia / Q000032:analysis; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D002244:Carbon / Q000032:analysis; D004952:Esters; D062385:Hydroxybenzoates / Q000032:analysis* / Q000737:chemistry; D007700:Kinetics; D009584:Nitrogen / Q000032:analysis; D010795:Phthalic Acids / Q000032:analysis* / Q000737:chemistry; D012722:Sewage / Q000737:chemistry / Q000382:microbiology; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D004952:Esters; D062385:Hydroxybenzoates; D010795:Phthalic Acids; D012722:Sewage; D014874:Water Pollutants, Chemical; D002244:Carbon; D000641:Ammonia; C017616:phenolic acid; D009584:Nitrogen
keywords: Biodegradation rate; C/N ratio; Landfill leachate; Membrane bioreactor; Sludge age; Toxic organic pollutants