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研究报告

熊宇晶,洪华嫦,周小玲,阮孟勇,肖卓群,李铭红.亚硝氮在氯及氯胺消毒中形成三氯硝基甲烷的作用研究 ——以色氨酸为例[J].环境科学学报,2014,34(10):2514-2519

Effects of nitrite on the formation of trichloronitromethane during chlorination/ chloramination:tryptophan as an example

基金项目：国家自然科学基金(No.21107099,51108424);浙江省自然科学基金(No.Y5110157);浙江师范大学博士启动基金(No.ZC304009166)

摘要：以溶解有机碳为5 mg·L^-1的色氨酸溶液为研究对象,探索氯和氯胺消毒时,不同影响因子对亚硝氮在三氯硝基甲烷(TCNM)形成中的作用,从而识别其关键消毒因子.结果表明:NO^-₂的加入对TCNM的形成有明显的促进作用.对氯消毒来说,NO^-₂对TCNM形成的促进作用在酸性条件下(TCNM增量为11.82 μg·L^-1)比碱性条件下(TCNM增量为2.66 μg·L^-1)更为明显;而对于氯胺,却在中碱性条件下较为明显(pH=5,6,7,8,9,TCNM的增量分别为0.04、0.11、0.50、0.34、0.27 μg·L^-1).但不管是氯消毒还是氯胺消毒,NO^-₂对TCNM形成的促进作用基本随着消毒剂量、反应时间的增加而增加.由极差分析得知,氯、氯胺消毒下影响NO^-₂对 TCNM形成的关键的因子均是pH值.

Abstract：This study investigated the effects of nitrite on the formation of trichloronitromethane (TCNM) upon chlorination/chloramination of trypto-phan solution (DOC=5mg·L^-1).The results showed that nitrite ion promoted the formation of TCNM obviously.In chlorination,the promotion of TCNM formation in acid condition(the increase amount of TCNM reached 11.82 μg·L^-1) was more significant than in alkaline condition(the increase amount of TCNM reached 2.66μg·L^-1);yet opposite was true for chloramination (the increase amount of TCNM in pH 5,6,7,8,9 was 0.04,0.11,0.50,0.34 μg·L^-1 and 0.27 μg·L^-1,respectively).However,the facilitation of TCNM formation from nitrite addition increased with the chlorine/chloramine dose and reaction time for both chlorination or chloramination. Range analysis also revealed that for tryptophan solution,the key factor for nitrite in promoting TCNM formation in chlorination/chloramina-tion test was pH value.