摘要
Abstract
In UV/ H2 O2 process,effects of H 2 O2 concentration and water quality parameters on degradation of ibuprofen (IBU)were investigated. Furthermore,changes of IBU degradation,TOC removal and toxicity were studied,and photoproducts of IBU were also analyzed. Toxicity of IBU and its reaction samples were evaluated by bioluminescence inhibition using vibrio fischeri,and EC 50,15 min value of IBU was 68 mg / L. In UV direct photolysis,biological toxicity increased gradually with the degradation of IBU,while TOC had no change. when UV fluence was 3 816 mJ / cm2 ,41% of IBU was degraded,and the inhibition rate increased from 17. 48% to 43. 58% . In UV/ H2 O2 advanced processes,both toxicity and TOC were decreased with the degradation of IBU. When UV fluence was 7 632 mJ / cm2 ,all of IBU degraded,and the inhibition rate decreased from 18. 20% to 0. 8%,while TOC only began to decrease. Several photoproducts such as terephthalic acid,malonic acid,propionic acid,benzoic acid,glycerol and other small molecular carboxylic acid forming in this process were identified by GC MS. In UV/ H2 O2 processes,detoxification was much easier than mineralization,and the optimal time for degradation of pollutants in UV/ H 2 O2 process would be determined by parent compound degradation and toxicity changes.关键词
UV/ H2 O2/布洛芬/发光菌/费氏弧菌/生物毒性/光降解Key words
UV/ H2 O2/ibuprofen (IBU)/photogenic bacteria/vibrio fischeri/biological toxicity/photodegradation分类
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