Jo, HJ Lee, SM Kim, HJ Kim, JG Choi, JS Park, YK Jung, J 2024-01-21T03:31:26Z 2024-01-21T03:31:26Z 2021-09-01 2006-04 0236-5731 https://pubs.kist.re.kr/handle/201004/135632 In order to evaluate the use of gamma-ray treatment as a pretreatment to conventional biological methods, the effects of gamma-irradiation on biodegradability (BOD5/COD) of textile and pulp wastewaters were investigated. For all wastewaters studied in this work, the efficiency of treatment based on TOC removal was insignificant even at an absorbed dose of 20 kGy. However, the change of biodegradability was noticeable and largely dependent on the chemical property of wastewaters and the absorbed dose of gamma-rays. For textile wastewaters, gamma-ray treatment increased the biodegradability of desizing effluent due to degradation of polymeric sizing agents such as polyvinyl alcohol. Interestingly, the weight-loss showed the highest value of 0.97 at a relatively low dose of 1 kGy. This may be caused by the degradation of less biodegradable ethylene glycol prior to terephthalic acid decomposition. For pulp wastewater, the gamma-ray treatment did not improve the biodegradability of cooking and bleaching of C/D effluents. However, the biodegradability of bleaching E1 and final effluents was abruptly increased up to 5 kGy then slowly decreased as the absorbed dose was increased. The initial increase of biodegradability may be induced by the decomposition of refractory organic compounds such as chlorophenols, which are known to be the main components of bleaching C/D and final effluents. English SPRINGER TEXTILE WASTE-WATER ADVANCED OXIDATION GAMMA-IRRADIATION DYES DEGRADATION DECOLORIZATION DETOXIFICATION DECOLORATION EFFLUENT REMOVAL Improvement of biodegradability of industrial wastewaters by radiation treatment Article 10.1556/JRNC.268.2006.1.25 1 JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, v.268, no.1, pp.145 - 150 JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY 268 1 145 150 scie scopus 000235902200025 2-s2.0-33644837716 Chemistry, Analytical Chemistry, Inorganic & Nuclear Nuclear Science & Technology Chemistry Nuclear Science & Technology Article TEXTILE WASTE-WATER ADVANCED OXIDATION GAMMA-IRRADIATION DYES DEGRADATION DECOLORIZATION DETOXIFICATION DECOLORATION EFFLUENT REMOVAL