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  • Title: Biokinetic modeling of in situ bioremediation of BTX compounds-impact of process variables and scaleup implications.
    Author: Nakhla G.
    Journal: Water Res; 2003 Mar; 37(6):1296-307. PubMed ID: 12598194.
    Abstract:
    The impact of three process parameters, i.e. ground water velocity, oxygen-to-BTX mass ratio, and benzene, toluene and xylene (BTX) concentrations on first-order biodegradation kinetics in a pilot-scale in situ bioremediation system was assessed. Generally, first-order biodegradation coefficients decreased with ground water velocity, and increased with hydrogen peroxide dose and BTX concentration. First-order biodegradation rate coefficients for benzene, toluene, and o-xylene varied from 0.3 to 0.81, 0.24 to 0.72, and 0.21 to 0.63 d(-1), respectively. Biomass-specific first-order rate coefficients were insensitive to ground water velocity, and decreased with increasing BTX concentrations. At 10mg/l BTX concentration, the specific first-order coefficients increased with peroxide dose. However, at the 50mg/l BTX concentration and a peroxide dose of 1020 mg/l, a 30-70% reduction in specific first-order biodegradation coefficients was observed. BTX biodegradation kinetics in this pilot-scale system were approximately one-to-two orders of magnitude slower than in soil microcosms and mixed culture bioreactors, and about 200-300% higher than full-scale systems.
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