title: H2O2/UV enhanced degradation of pesticides in wastewater.
abstract: Photodegradation of organic pesticides in industrial wastewater was examined in a UV/H2O2/air system. An experimentally determined optimal amount of hydrogen peroxide (0.008% v/v) indicates that hydrogen peroxide concentration controlled the efficiency of photodegradation. Pre-treatment operations such as sedimentation, filtration and coagulation were used to obtain better efficiency of pesticide removal and to cut down on irradiation time. Finally, scale-up experiments in the air-sparged hydrocyclone (ASH) reactor were carried out. After 5 min irradiation of 100 dm3 industrial wastewater almost all pesticides were destroyed. Thus the ASH reactor proved to be an effective contactor for carrying out photochemical reactions.
authors.affiliation: Department of Chemical Technology, Chemical Faculty, Gdansk University of Technology, ul. Narutowicza 11/12, 80-952 Gdansk, Poland. ewwlasza@chem.pg.gda.pl
authors.forename: E
authors.initials: E
authors.lastname: Kowalska
authors.forename: M
authors.initials: M
authors.lastname: Janczarek
authors.forename: J
authors.initials: J
authors.lastname: Hupka
authors.forename: M
authors.initials: M
authors.lastname: Grynkiewicz
mesh_terms: D005740:Gases; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007220:Industrial Waste; D016877:Oxidants / Q000737:chemistry*; D010575:Pesticides / Q000737:chemistry* / Q000302:isolation & purification*; D010777:Photochemistry; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
chemical_list: D005740:Gases; D007220:Industrial Waste; D016877:Oxidants; D010575:Pesticides; D006861:Hydrogen Peroxide