Effects of biosorption and dissolution on the biodegradation of di-n-butyl phthalate
Authors: Wang, Xiaolan; Grady, C. P. Leslie
Source: Water Environment Research, Volume 67, Number 5, July/August 1995 , pp. 863-871(9)
Publisher: Water Environment Federation
Abstract:The effects of biosorption and desorption on biodegradation were studied by using di-n-butyl phthalate (DBP) as a model pollutant of low solubility. Batch experiments were performed to measure the rate of DBP biodegradation in the presence and absence of sorptive biomass incapable of its biodegradation. When the initial concentration of DBP in a batch reactor was lower than the solubility limit, biosorption before biodegradation decreased the biodegradation rate by lowering the soluble DBP concentration. When the DBP concentration was higher than the solubility limit, biosorption before biodegradation increased the biodegradation rate because the desorption rate was much faster than the dissolution rate from the nonaqueous phase. An empirical model, which included a desorption/dissolution rate term, was successfully applied to describe the biodegradation data in the absence of significant biosorption. The model was incapable of describing the data in the presence of significant biosorption because of the growth of the degrader on products released by the sorptive biomass.
Document Type: Research Article
Publication date: July 1, 1995
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