净水技术2022，Vol.41Issue(1)：45-50,95,7.DOI:10.15890/j.cnki.jsjs.2022.01.007
天冬氨酸氯化生成含氮消毒副产物连续反应动力学的建模
Modelling of Consecutive Reaction Kinetics for N-DBPs Formation Chlorinated by Aspartic Acid
摘要
Abstract
Organic compounds in drinking water react with disinfectants to produce disinfection by-products(DBPs)，in which nitrogenous disinfection by-products(N-DBPs) have stronger genotoxicity and cytotoxicity than conventional DBPs. In order to provide a reference for the effective control of N-DBPs in actual production, it is important to determine the generation trend and stability of N-DBPs. As a ubiquitous amino acid in natural water, aspartic acid(Asp) was used as the precursor of N-DBPs in this study. The effect of the reaction time of N-DBPs，which was represented by dichloroacetonitrile(DCAN) and dichloroacetamide(DCAcAm) in this study, generated by chlorination of Asp was studied. The hydrolytic properties of N-DBPs were analyzed, the consecutive reaction mechanism of chlorinated nitrogenous disinfection by-products was investigated and the kinetic model of consecutive reaction was established. Because the generation of N-DBPs was also accompanied by its hydrolysis，the results showed that the concentrations of DCAN and DCAcAm both increased firstly and then decreased with the increase of reaction time. Hydrolysis constants were 0. 011 h -1，0. 008 h -1，respectively, which indicated that DCAN was more unstable. Through data fitting, the maximum concentrations of DCAN and DCAcAm were 125.4μg/L and 33. 03μg/L, and corresponding time were 4.66 h and 7.61 h, respectively. Results show that the generation and hydrolysis of N-DBPs are first-order reactions, and also conform to consecutive first-order reaction kinetics，but maximum concentration and corresponding time are different.关键词
含氮消毒副产物(N-DBPs)/反应动力学/二氯乙腈(DCAN)/二氯乙酰胺(DCAcAm)/天冬氨酸(Asp)Key words
nitrogenous disinfection by-products(N-DBPs)/reaction kinetics/dichloroacetonitrile(DACN)/dichloroacetamide(DCAcAm)/aspartic acid(Asp)分类
建筑与水利引用本文复制引用
薛如冰,刘志刚,周正协,何建荣,许航,陈卫..天冬氨酸氯化生成含氮消毒副产物连续反应动力学的建模[J].净水技术,2022,41(1):45-50,95,7.基金项目
宁波市自然科学基金资助项目(2019A610456) （2019A610456）
