水中臭氧杀菌效果及产生亚硝酸盐量的检测

EXAMINATION OF GERMICIDAL EFFICACY OF OZONE AND AMOUNT OF NITRITES PRODUCED IN OZONIZED WATER

为了解将无声放电法制备的臭氧导入水中，对大肠杆菌的杀灭效果及其后水中亚硝酸盐含量，进行了悬液定量杀菌试验与用盐酸萘乙二胺法测定亚硝酸盐含量。结果，对纯净水作用１０ｍｉｎ（水中含臭氧１．０２０～１．２２０ｍｇ／Ｌ），对自来水作用２０ ｍｉｎ（水中含臭氧２．５６２～２．６０２ ｍｇ／Ｌ），对水中大肠杆菌杀灭率均为１００％。作用１５ｍｉｎ，纯净水中含亚硝酸盐０．１１９～０．１５０２ｍｇ／Ｌ 自来水中含亚硝酸盐０．１１２９～０．１６２６ ｍｇ／Ｌ。说明该法所产生臭氧对水中大肠杆菌杀灭效果较好，但消毒后水中亚硝酸盐含量严重超标准。

In order to know the effcacy of ozone, which was prepared by soundless discharge method and introduced into water, in killing Escherichia coli and the nitrite content in the ozonized water, suspension quantitative germicidal test and measurement of nitrite content using naphthalene ethyl diamine hydrochloride method were carried out. The results showed that when ozone was introduced into purified water for 10 min (the ozone content in water was 1.020-1 .220 mg / L) and into tap water for 20 min (the ozone content in water was 2.562 - 2.602 mg/ L), the killing rate of Escherjichia coli in both waters was 100%. After intro- ducing ozone into water for 15 min, the nitrite content in purified water was 0. 1191 - 0. 1502 mg /L and that in tap water was 0. 1129- 0. 1626 mg / L. The above results indicate that the ozone produced by this method has good effcacy in killing Ascherichia coli in water, but the nitrite content after disinfection exceeds seriously the permissible limit.