title: Performance evaluation of Malathion biodegradation in batch and continuous packed bed bioreactor (PBBR).
abstract: The aim of this work was to study the biodegradation of Malathion in batch and continuous packed bed (Polyurethane foam; PUF) bioreactor (PBBR). After 10days, 89% Malathion removal was observed in batch PBBR. Continuous PBBR was operated at various flow rates (5-30mL/h) under optimum condition over a period of 75days. Inlet loading rates and elimination capacities were observed in the range of 36-216 and 7.20-145.4mg/L/day with an average removal efficiency of more than 90% under steady state conditions. GC/MS analysis confirms phosphorodithionicacid,O,O,S-trimethylester and diethylmercaptosuccinate as metabolites. Biodegradation of Malathion under inhibitory and non-inhibitory conditions was studied using Monod and Andrew-Haldane models and the kinetic constants were calculated and found to be μmax: 0.271 per day; Ks: 126.3mg/L using Monod and μmax: 0.315 per day; Ks: 151.32mg/L; Ki: 594.75mg/L using Andrew-Haldane models.
authors.affiliation: Department of Chemical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi 221 005, India.
authors.forename: S R
authors.initials: SR
authors.lastname: Geed
authors.affiliation: Department of Chemical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi 221 005, India.
authors.forename: M K
authors.initials: MK
authors.lastname: Kureel
authors.affiliation: Department of Chemical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi 221 005, India.
authors.forename: B S
authors.initials: BS
authors.lastname: Giri
authors.affiliation: Department of Chemical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi 221 005, India.
authors.forename: R S
authors.initials: RS
authors.lastname: Singh
authors.affiliation: Department of Chemical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi 221 005, India. Electronic address: bnrai.che@itbhu.ac.in.
authors.forename: B N
authors.initials: BN
authors.lastname: Rai
mesh_terms: D001673:Biodegradation, Environmental; D019149:Bioreactors; D007700:Kinetics; D008294:Malathion / Q000737:chemistry*
chemical_list: D008294:Malathion
keywords: Continuous packed bed reactor; GC–MS; Kinetic parameter; Malathion; Removal efficiency