title: Corrected first-order model of DEHP degradation.
abstract: Corrected first-order model was applied to describe the biological removal of di-(2-ethylhexyl) phthalate (DEHP) in sludge-amended soil along with batch and continuous-flow anaerobic reactors with different initial/influent DEHP concentrations and hydraulic retention times. Only two kinetic parameters - the first-order rate coefficient k describing the overall kinetics of the process and the coefficient alpha characterizing the fraction of non-degradable DEHP - were used to fit the array of experimental data published earlier. The values of k and alpha estimated for DEHP removal from different sludges at 35 degrees C varied within the range of 0.03-0.07 d(-1) and 0.25-0.5, respectively. In sludge-amended soil, the first-order kinetic coefficient k increased from 0.007 to 0.028 d(-1) and the fraction of non-degradable DEHP alpha decreased from 0.6 to 0.5 with the increase in incubation temperature from 5 to 20 degrees C. The rate coefficient k increased by a factor of 2 when the temperature increased from 5 to 10 degrees C or from 10 to 20 degrees C.
authors.affiliation: Water Problems Institute of the Russian Academy of Sciences, Gubkina Str. 3, Moscow 119991, Russian Federation. vavilin@aqua.laser.ru
authors.forename: Vasily A
authors.initials: VA
authors.lastname: Vavilin
mesh_terms: D001673:Biodegradation, Environmental; D019149:Bioreactors; D004051:Diethylhexyl Phthalate / Q000737:chemistry*; D004785:Environmental Pollutants; D007700:Kinetics; D012722:Sewage / Q000737:chemistry; D013997:Time Factors
chemical_list: D004785:Environmental Pollutants; D012722:Sewage; D004051:Diethylhexyl Phthalate