Influencing factors and degradation products of antipyrine chlorination in water with free chlorine  

作　　者：Meiquan Cai Liqiu Zhang Fei Qi Li Feng 

机构地区：[1]Beijing Key Laboratory for Source Control Technology of Water Pollution,College of Environmental Science and Engineering,Beijing Forestry University

出　　处：《Journal of Environmental Sciences》2013年第1期77-84,共8页环境科学学报（英文版）

基　　金：supported by the Research Funds for the Central Universities (No. YX2011-12, BLJC200903,TD2011-22);the National Natural Science Foundation of China (No. 51178046);the Program for New Century Excellent Talents in University of China (No.NCET-08-0732);the National High Technology Research and Development Program (863) of China (No.2008AA06Z309)

摘　　要：Owing to its low cost, free chlorine is one of the most common disinfectants for wastewater and drinking water treatment. However, the formation of disinfection byproducts has been found to occur after free chlorine disinfection in recent decades. Antipyrine （ANT）, an anti-inflammatory analgesic, has been frequently detected in the aquatic environment. In this work, the removal efficiency of ANT by free chlorine oxidation in ultrapure water was investigated with batch experiments. The influencing factors on the removal of ANT were explored at initial concentrations of ANT from 0.04 to 0.64 rag/L, free chlorine dosage from 0.30 to 1.31 rag/L, and pH from 1.5 to 9.0. The main degradation products were identified by solid phase extraction-gas chromatography-mass spectrometry. The results showed that ANT reacted rapidly with free chlorine in ultrapure water systems and up to 90.6% removal efficiency of ANT was achieved after 25 sec （initial free chlorine 1 mg/L, ANT 0.5 mg/L, pH 7.0）. Higher oxidant dosage, lower ANT initial concentration and low pH favor the ANT removal. The main degradation product in ANT chlorination was a monochlorine substitution product （4-chloro-l,2-dihydro- 1,5-dimethyl-2-phenyl-3H-pyrazol-3-one）, which can be further chlorinated by free chlorine. In addition, the total organic carbon result indicated that ANT is difficult to be mineralized using chlorine.Owing to its low cost, free chlorine is one of the most common disinfectants for wastewater and drinking water treatment. However, the formation of disinfection byproducts has been found to occur after free chlorine disinfection in recent decades. Antipyrine （ANT）, an anti-inflammatory analgesic, has been frequently detected in the aquatic environment. In this work, the removal efficiency of ANT by free chlorine oxidation in ultrapure water was investigated with batch experiments. The influencing factors on the removal of ANT were explored at initial concentrations of ANT from 0.04 to 0.64 rag/L, free chlorine dosage from 0.30 to 1.31 rag/L, and pH from 1.5 to 9.0. The main degradation products were identified by solid phase extraction-gas chromatography-mass spectrometry. The results showed that ANT reacted rapidly with free chlorine in ultrapure water systems and up to 90.6% removal efficiency of ANT was achieved after 25 sec （initial free chlorine 1 mg/L, ANT 0.5 mg/L, pH 7.0）. Higher oxidant dosage, lower ANT initial concentration and low pH favor the ANT removal. The main degradation product in ANT chlorination was a monochlorine substitution product （4-chloro-l,2-dihydro- 1,5-dimethyl-2-phenyl-3H-pyrazol-3-one）, which can be further chlorinated by free chlorine. In addition, the total organic carbon result indicated that ANT is difficult to be mineralized using chlorine.

关 键 词：ANTIPYRINE CHLORINATION disinfection byproduct 

分 类 号：X13[环境科学与工程—环境科学]