title: Removal kinetics of acetone and MIBK from a complex industrial wastewater by an acclimatized activated sludge.
abstract: Removal rates of acetone and methyl isobutyl ketone (MIBK) were determined singularly and in combination in batch experiments employing an acclimatized activated sludge from a pilot system treating an organic chemical manufacturer industrial wastewater, as well as during the course of operation of the pilot system. Both acetone and MIBK removals were described by first-order removal kinetics. Acetone, as a single substrate, was biodegraded at a rate of 1.7 day(-1). MIBK was biodegraded, during the single-substrate experiments, at an observed rate of 2.23 day(-1). Relative to the control (no spike) experiments, acetone removal was augmented by a factor of 3 during the acetone spike, with an observed biomass-specific removal rate of 0.0023 L/mg VSSday. MIBK removal during an MIBK spike was also enhanced by a factor of 2, and the greatest biomass-specific removal rate of MIBK was observed during the acetone spike of 0.0019 L/mg VSSday. The observed rates were approximately 3 orders of magnitude greater than the observed rates in the pilot scale system. MIBK exerted a synergistic effect on the acetone-removal rate while acetone exerted an inhibitory impact on the MIBK-removal rate.
authors.affiliation: University of Western Ontario, Department of Chemical & Biochemical Engineering, London, Canada.
authors.forename: David
authors.initials: D
authors.lastname: Quesnel
authors.forename: George
authors.initials: G
authors.lastname: Nakhla
mesh_terms: D000096:Acetone / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002617:Chemical Industry; D007220:Industrial Waste; D007700:Kinetics; D008742:Methyl n-Butyl Ketone / Q000378:metabolism*; D012722:Sewage / Q000382:microbiology; D014835:Volatilization; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification
chemical_list: D007220:Industrial Waste; D012722:Sewage; D014874:Water Pollutants, Chemical; D000096:Acetone; D008742:Methyl n-Butyl Ketone; C005458:methyl isobutyl ketone