Tests of Combined Use of CIO2 and Liquid
Chlorine
For Sterilization of Municipal Sewage
SHUI
Chun-yu.WANYAN Hua
(College of Environmental Science and Eng.of Lanhou
Railway Institute.Lanzhou 730070，China)

Abstract：Two antiseptics of chlorine dioxide and liquid
chlorine were tested in a combined way for the　sterilization of municipal
sewage.The effects of the proportioning of the two antiseptics，the time of
their being in　contact With the sewage as well as the quantity of residual
ClO₂ and Cl₂ on the number of the 　sold groups were
studied，the result of which showed：When ClO₂ and liquid
chlorine were used in a combined way　at a ratio of 2：1 in sterilizing
municipal sewage，the result was good.When the quantity of ClO₂
fed in was 3 mg／L and that of liquid chlorine was 1.5 mg／L，with the
contact time being 30 min., the dieing－out rate of colibacilllus reached
99.9％.
Keywords: sewage treatment；sterlilization; municipal
sewage：colibacillusoid

　　液氯作为一种成熟的消毒剂已有百年的应用历史，但液氯消毒使水中三氯甲烷(THMs)的含量增加^[1]。近年来，氯消毒所引发的环境健康问题越来越引起人们的重视，氯消毒替代品的研究也越来越深入，在可选用的新型消毒剂中，二氧化氯被认为是其中性价比最优的一种^[2]，但是使用二氧化氯有个较严重的问题，一部分二氧化氯被还原为可能会对人体健康产生不良影响的ClO₂^-[3]。而且，二氧化氯制造成本较高，限制了其推广使用。本实验研究了二氧化氯和液氯按一定比例同时投加，联合用于回用污水消毒的效能，研究的目的是为处理后的污水回用寻求安全高效的消毒剂。
1 材料和方法
1.1
试验材料
　　污水取自甘肃西峰市城市污水资源化试验厂二沉池出水，主要成分为生活污水，二氧化氯溶液、液氯溶液自制，纯度98％以上。
1.2
试验方法
　　取二沉池出水水样，pH＝7.8，同时投加二氧化氯和液氯两种消毒剂，投加量液氯为二氧化氯的一半，二氧化氯投加量分别为
2，3，4，5 mg／L，相应的氯投加量分别为1，1.5，2，2.5 mg／L。联合消毒剂与污水在充分混合下于黑暗处反应，接触时间分别为