title: Beta-endosulfan removal from water by ozone oxidation.
abstract: Beta-endosulfan solutions were ozonated in a lab scale semi-batch reactor in various experimental conditions. Ozonation kinetics of beta-endosulfan and effects of some parameters such as pH, temperature, partial pressure and ozone dosage on oxidation were investigated. Increasing ozone dosage and decreasing of temperature and pH increased the oxidation rate of beta-endosulfan. Maximum 97% of beta-endosulfan could be removed at both 16-mg/min ozone dosages and pH = 4 for 60 minutes of ozonation. The order of the reaction is determined as pseudo first order. Although the rate of reaction was lower than other pesticide oxidation rates cited in the literature, beta-endosulfan reaction to ozonation was achieved with almost 90% removal rate. The temperature dependent rate constant for beta-endosulfan oxidation was determined as kd = 0.947 exp(-2.16 x 10(-3)/T).
authors.affiliation: Istanbul Technical University, Environmental Eng'g. Dep., Maslak, 80626, Istanbul, Turkey. yazgan@itu.edu.tr
authors.forename: M S
authors.initials: MS
authors.lastname: Yazgan
authors.forename: C
authors.initials: C
authors.lastname: Kinaci
mesh_terms: D004726:Endosulfan / Q000737:chemistry / Q000302:isolation & purification*; D006843:Hydrocarbons, Chlorinated; D006863:Hydrogen-Ion Concentration; D007306:Insecticides / Q000737:chemistry / Q000302:isolation & purification*; D007700:Kinetics; D010083:Oxidants, Photochemical / Q000737:chemistry*; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D013696:Temperature; D018508:Water Purification / Q000379:methods*
chemical_list: D006843:Hydrocarbons, Chlorinated; D007306:Insecticides; D010083:Oxidants, Photochemical; D010126:Ozone; D004726:Endosulfan