A disappearance model for the prediction of trichlorophenol ozonation.
The disappearance and modeling of the ozonation of 2,4,6-trichlorophenol (TCP) was studied under different initial TCP concentrations and initial pH levels. The ozonation of TCP was found to follow a pseudo-first-order reaction. The degradation rates increased with the initial pH, and decreased with initial TCP concentration. 2,6-Dichlorohydroquinone was identified as the major intermediate, indicating that dechlorination and hydroxylation co-occurred during TCP ozonation. A model was proposed to quantitatively predict the pseudo-first-order rate constants under different initial TCP concentration and different initial pH levels. The proposed model can successfully describe the reaction; therefore another practical equation was proposed to predict the TCP removal rate at any detention time, which has high potential for practical applications and reactor design.
Chu
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Department of Civil and Structural Engineering, Research Centre for Urban Environmental Technology and Management, The Hong Kong Polytechnic University, Kowloon, Hung Hom, Hong Kong. cewchu@polyu.edu.hk
Wong
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D002733:Chlorophenols / Q000737:chemistry*; D005544:Forecasting; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008956:Models, Chemical; D009153:Mutagens / Q000737:chemistry*; D010083:Oxidants, Photochemical / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000379:methods*
D002733:Chlorophenols; D009153:Mutagens; D010083:Oxidants, Photochemical; D014874:Water Pollutants, Chemical; D010126:Ozone; C024564:2,4,6-trichlorophenol