title: Efficacy of Aspergillus sp. for degradation of chlorpyrifos in batch and continuous aerated packed bed bioreactors.
abstract: Aerobic biodegradation of chlorpyrifos (CP) by Aspergillus sp. was investigated in batch and continuous packed bed bioreactors. The optimal process parameters for achieving the maximum removal efficiency (RE), determined using a batch bioreactor packed with polyurethane foam pieces, were inoculum level: 2.5 mg (wet weight) mL(-1), pH 7.0, temperature 28 °C, DO 5.8 mg L(-1), and CP concentration 300 mg L(-1). The continuous packed bed bioreactor was operated at flow rates ranging from 10 to 40 mL h(-1) while keeping other parameters at their optimal level. Steady-state CP removal efficiencies greater than 85 % were obtained up to the inlet loading of 180 mg L(-1) d(-1). The continuous bioreactor behaved as a plug flow unit and was able to stabilize quickly after perturbation in the inlet loading.
authors.affiliation: Department of Botany, Faculty of Science, Banaras Hindu University, 221005, Varanasi, India.
authors.forename: Maya
authors.initials: M
authors.lastname: Yadav
authors.forename: Navnita
authors.initials: N
authors.lastname: Srivastva
authors.forename: Awadhesh Kumar
authors.initials: AK
authors.lastname: Shukla
authors.forename: Ram Sharan
authors.initials: RS
authors.lastname: Singh
authors.forename: Siddh Nath
authors.initials: SN
authors.lastname: Upadhyay
authors.forename: Suresh Kumar
authors.initials: SK
authors.lastname: Dubey
mesh_terms: D000332:Aerobiosis; D001230:Aspergillus / Q000378:metabolism; D001673:Biodegradation, Environmental; D019149:Bioreactors; D004390:Chlorpyrifos / Q000378:metabolism*; D013696:Temperature
chemical_list: D004390:Chlorpyrifos