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Removal kinetics of acetone and MIBK from a complex industrial wastewater by an acclimatized activated sludge.

Journal of hazardous materials (2005-11-24)
David Quesnel, George Nakhla
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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
4-Methyl-2-pentanone, suitable for HPLC, ≥99.5%
Sigma-Aldrich
4-Methyl-2-pentanone, ACS reagent, ≥98.5%
Supelco
4-Methyl-2-pentanone, analytical standard
Sigma-Aldrich
2-Hexanone, reagent grade, 98%
Sigma-Aldrich
4-Methyl-2-pentanone, ≥99%
Sigma-Aldrich
4-Methyl-2-pentanone, ≥99%, FCC
Supelco
2-Hexanone, analytical standard
Supelco
2-Hexanone, analytical standard

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