Dechlorination and decolorization of chloro-organics in pulp bleach plant E-1 effluents by advanced oxidation processes

• Published in: Bioresource technology Vol. 94; no. 3; pp. 267 - 274
• Main Authors: Wang, Rui, Chen, Chen-Loung, Gratzl, Josef S
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-09-2004; Elsevier Science
• Subjects: 254 nm photons; Advanced oxidation processes; Biological and medical sciences; bleaching; Chloro-organics; Color carriers; Dechlorination; Decolorization; Fundamental and applied biological sciences. Psychology; Hydrocarbons, Chlorinated - chemistry; Hydrogen peroxide; Hydrogen Peroxide - chemistry; Hydrogen-Ion Concentration; Industrial Waste; irradiation; Kinetics; organochlorine compounds; oxidation; Oxygen; Oxygen - chemistry; Ozone; Ozone - chemistry; Photolysis; pulp and paper mill effluents; Pulp plant bleaching effluent; ultraviolet radiation; Ultraviolet Rays; UV-irradiation; Waste Disposal, Fluid - methods; wastewater treatment; Water Pollutants, Chemical - analysis; Advanced oxidation processes; Chloro-organics; Color carriers; Decolorization; Dechlorination; Oxygen; Hydrogen peroxide; UV-irradiation; Ozone; Pulp plant bleaching effluent; 254 nm photons; Color; Decolorizing process; UV- irradiation; Hydrogen Peroxides; Ultraviolet irradiation; Chlorine Organic compounds; Spent bleaching liquor; Oxidation; Effluent
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2004.01.005

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
2O
2/UV-photolysis processes with irradiation of 254 nm photons. The studies were extended to ozonation and O
3–H
2O
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.