中文摘要：

以纯水和管网水为研究对象,分别考察了氯氨比、氯胺质量浓度、总有机碳（total organic carbon,TOC）浓度、NO2--N质量浓度、温度θ和pH等水质参数对氯胺衰减的影响.研究结果表明,氯胺在纯水中存在自衰减现象,氯氨比和初始氯胺质量浓度对其自衰减都有一定影响.管网水中氯胺的衰减速率则明显大于同条件下纯水中氯胺的衰减速率,w（Cl）∶w（N）=4∶1的氯氨比w（Cl）∶w（N）=3∶1的氯胺具有更好的稳定性.氯胺初始质量浓度是氯胺衰减的重要因素,初始质量浓度越大,氯胺衰减的速率越快;水中有机物和NO2--N质量浓度的增加会提高氯胺衰减速率;温度对氯胺的衰减有明显影响,随温度升高,氯胺在水相中消耗变快;氯胺的衰减属于酸催化反应,pH的降低会增加氯胺的衰减速率.

英文摘要：

Water quality parameters including chlorine to ammonia nitrogen application ratio w（Cl）∶w（N）,initial chloramine concentration,organic compound level,nitrite concentration,temperature and pH,which affect chloramines decay,are investigated in pure water and the water of a distribution system.Results show that chloramine can autodecompose in pure water.w（Cl）∶w（N） and initial chloramine concentration influence its decay rate.The rate of chloramine decay is higher in bulk water of the distribution system than that in pure water.Chloramine is more stable with w Cl∶w（N）=4∶1 than that of w（Cl）∶w（N）=3∶1.Initial chloramine concentration is an important factor inducing the high rate of chloramines decay with high initial chloramine concentration.The rate of Chloramines decay increases with increasing organic compound and nitrite concentration.The temperature inpacts on the rate of chloramines decay,which means high decay rate in bulk water with increasing temperature.In addition,the reaction of chloramines decay is a type of acid-catalysis,and lower pH elevates the rate of chloramines decay.