Analysis of the mechanism and mathematical modeling of diethylhexylphthalate degradation in aquatic environment |
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| Authors: | V A Vavilin |
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| Institution: | (1) Department of Bio-Engineering, Dalian Nationalities University, Economical and Technological Development Zone, Dalian, 116600, China;(2) Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama Ikoma, Nara 630-0192, Japan; |
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| Abstract: | Degradation mechanism of diethylhexylphthalate, a pollutant of water bodies, is analyzed. A modified first-order equation
with a correction for a nondegradable fraction is suggested. The succession of biochemical reactions in the process of anaerobic
degradation of monoethylhexylphthalate is considered, and two stages—ester hydrolysis and phthalic acid transformation into
methane and carbon dioxide—are identified as limiting the overall rate. A one-dimensional distributed model is used to describe
the degradation of three phthalates with different water solubility: diethylphthalate DEP, which has a relatively high solubility;
dibutyl phthalate DBP, poorly soluble; and diethylhexylphthalate DEHP, almost insoluble. The physicochemical processes of
sorption/desorption play an important role in the process of their degradation. The enzymatic splitting, carried out by microorganisms,
reduces the concentration of dissolved diethylhexylphthalate and can facilitate desorption processes. |
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