Factors affecting ultraviolet irradiation/hydrogen peroxide (UV/H2O2) degradation of mixed N-nitrosamines in water

• Published in: Journal of hazardous materials 2012-09, Vol.231-232, p.43-48
• Main Authors: Zhou, Chao, Gao, Naiyun, Deng, Yang, Chu, Wenhai, Rong, Wenlei, Zhou, Shengdong
• Format: Article
• Language: English
• Subjects: anions; Anions - chemistry; Applied sciences; Atmospheric pollution; byproducts; carcinogenicity; Chemical engineering; disinfection; Disinfection by-products (DBPs); drinking water; Drinking water and swimming-pool water. Desalination; Exact sciences and technology; hydrogen peroxide; Hydrogen Peroxide - chemistry; Hydrogen-Ion Concentration; Hydroxyl radical (OH[rad]); hydroxyl radicals; irradiation; mutagenicity; nitrosamines; Nitrosamines (NAms); Nitrosamines - chemistry; Nitrosamines - radiation effects; oxidants; Oxidation degradation; Pollution; Reactors; Safety; teratogenicity; Ultraviolet irradiation/hydrogen peroxide (UV/H2O2); ultraviolet radiation; Ultraviolet Rays; Water Pollutants, Chemical - chemistry; Water Pollutants, Chemical - radiation effects; Water treatment and pollution
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2012.06.032

[Display omitted] ► NAms with three-induced toxicity, as emerging DBPs, has caused a great public attention. ► No paper regards UV/H2O2 oxidation of mixed NAms in an aquatic environment. ► The treatment effect is typically affected by a few factors in water. ► NPIP and NDPhA are the most readily and difficult to be degraded due to unique structure. ► All the NAms degradation exhibited a pseudo-first-order kinetics pattern. Disinfection by-products (DBPs) are a great challenge to our drinking water security. Particularly, nitrosamines (NAms), as emerging DBPs, are potently carcinogenic, mutagenic, and teratogenic, and have increasingly attained public attention. This study was to evaluate the performance of the NAms degradation by the ultraviolet (UV) irradiation (253.7nm) in the presence of hydrogen peroxide (H2O2). In the UV/H2O2 system, hydroxyl radicals (OH), a type of nonselective and powerful oxidant, was produced to attack the molecules of NAms. Factors affecting the treatment efficiency, including the H2O2 dosage, initial NAms concentration, UV irradiation intensity, initial solution pH, and inorganic anions present in water, were evaluated. All the NAms degradation exhibited a pseudo-first-order kinetics pattern. Within 60min, 0.1mg/L of any NAms could be almost decomposed except NDPhA that required 120min for complete removal, at 25μmol/L H2O2 and at initial pH 7. Results demonstrate that the UV/H2O2 treatment is a viable option to control NAms in water.