Dechlorination and decolorization of chloro-organics in pulp bleach plant E-1 effluents by advanced oxidation processes.
Studies were conducted on the composition of chloro-organics in kraft-pulp bleach plant E-1 effluents and their response toward advanced oxidation processes, such as UV-, O(2)/UV-, O(3)/UV- and O(3)-H(2)O(2)/UV-photolysis processes with irradiation of 254 nm photons. The studies were extended to ozonation and O(3)-H(2)O(2) oxidation systems in alkaline aqueous solution. The effects of process variables included initial pH, addition of oxidant to the UV-photolysis system on the decolorization and dechlorination of the chloro-organics the E-1 bleaching effluents were also studied. The decolorization and dechlorination rate constants are increased in the presence of molecular oxygen in the UV-photolysis systems, but are decreased on addition of hydrogen peroxide. The dechlorination rate constants are increased appreciably on oxidation with ozone alone and a combination of ozone and hydrogen peroxide as compared to those of the corresponding UV-photolysis systems under aerial atmosphere.
Wang
Rui
R
Department of Wood and Paper Science, North Carolina State University, Raleigh, NC 27695-8005, USA.
Chen
Chen-Loung
CL
Gratzl
Josef S
JS
D006843:Hydrocarbons, Chlorinated / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007700:Kinetics; D010100:Oxygen / Q000737:chemistry; D010126:Ozone / Q000737:chemistry; D010209:Paper; D010782:Photolysis; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D006843:Hydrocarbons, Chlorinated; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D010126:Ozone; D006861:Hydrogen Peroxide; D010100:Oxygen