氨氮浓度对次氯酸钠消毒中水的影响  

Effect of ammonia nitrogen concentration on sodium hypochlorite disinfection of reclaimed water

作　　者：祝明[1] 杨雅雯[2] 赵燕[1] 朱百泉[1] 李佳[1] 

机构地区：[1]中国肉类食品综合研究中心,北京100068 [2]北京市劳动保护科学研究所,北京100054

出　　处：《环境工程学报》2011年第12期2793-2796,共4页Chinese Journal of Environmental Engineering

基　　金：北京市2010水务财政专项资金类项目(PXM2010-035219-105486)

摘　　要：研究了氨氮浓度对次氯酸钠消毒中水的影响,讨论了中水氨氮浓度、氯胺浓度、总余氯浓度、消毒接触时间和总大肠菌群指标的变化关系。结果表明,氨氮随消毒接触时间呈先降低再升高的趋势,中水氨氮浓度越高,其变化幅度越小,反之,则变化幅度较大;氯胺浓度随消毒接触时间的延长先升高再降低,而总余氯量则逐渐降低,并有一定的持续消毒作用;此外,总余氯随次氯酸钠投加量的增加呈先升高后降低再逐渐升高的趋势,整个反应过程符合折点加氯消毒理论;当次氯酸钠投加量与氨氮的比值(以后简称Cl/N)为25/1时,氨氮消耗掉的次氯酸钠量最多,生成的总余氯量最少;当Cl/N比大于25/1时,消毒后中水氨氮浓度为零,反之,则随Cl/N比升高逐渐降低;而当氨氮浓度相同时,中水消毒达标的主要影响因素是水中总大肠菌群的数量。The effect of ammonia nitrogen on the disinfection of reclaimed water with using sodium hypochlorite as the disinfector was studied. Other factors such as chloramine concentration, total chlorine concentration, reaction time were also considered. The results showed that the ammonia nitrogen concentration went up at the beginning, and then dropped. The higher initial ammonia nitrogen concentration, the lower its variation was. And the lower initial concentration, the higher variation was. And the concentration of chloramine went up at the beginning and then dropped till the end, and the chloramine had continual disinfection effect. The whole process was in accordance with break point chlorination disinfection theory. When the ratio of chlorine towards nitrogen was 25/1, ammonia nitrogen consumed the most sodium hypochlorite, and the total chlorine concentration was the lowest. When the ratio was high- er than 25/1, the ammonia nitrogen concentration was under the detection limit. When the ratio was lower than 25/1, the ammonia nitrogen concentration decreased as the C1/N increased. Under the same ammonia nitrogen concentration, the number of total coliforms was the key factor for the reclaimed water to meet disinfection standard.

关 键 词：氨氮 次氯酸钠 消毒 中水 

分 类 号：X703[环境科学与工程—环境工程]