再生水回用于循环冷却水的杀生剂复配研究  

Compound Preparation of Biocide in Reclaimed Water Used as Circulating Cooling Water

作　　者：韩漪[1] 田一梅[1] 吴萍[2] 苏溦娜 马媛[1] 

机构地区：[1]天津大学环境科学与工程学院,天津300072 [2]天津华能杨柳青热电有限责任公司,天津300380

出　　处：《中国给水排水》2013年第21期107-110,共4页China Water & Wastewater

基　　金：国家水体污染控制与治理科技重大专项(2009ZX07317-005)

摘　　要：再生水回用于工业循环冷却水时,微生物数量的增加会影响换热管道传热效果,降低管道使用寿命。使用平皿计数法,针对天津市某再生水厂出水的4倍浓缩水测得4种常用单体杀生剂的最佳杀菌剂量,在该剂量下进行正交试验得到两种复配杀生剂,并通过动态试验验证两种复配杀生剂的杀菌效果。结果表明,在异养菌总数约为106CFU/mL时,4种单体杀生剂的最佳杀菌剂量如下:稳定性二氧化氯和次氯酸钠均为6 mg/L、异噻唑啉酮为95 mg/L、1227为120 mg/L,杀菌率均可达到94%以上。经过正交试验得到两种复配药剂(1#、2#),1#组成如下:稳定性二氧化氯为3 mg/L、异噻唑啉酮为50 mg/L、1227为30 mg/L;2#组成如下:稳定性二氧化氯为4 mg/L、异噻唑啉酮为40 mg/L、次氯酸钠为2 mg/L,杀菌率均超过99%。在异养菌总数约为107CFU/mL时,通过动态试验可知,以上两种药剂的持续时间均超过7 d,杀菌效果较好。考虑经济因素后确定第一种复配药剂更适合用于电厂循环冷却系统的杀菌处理。When reclaimed water is used as industrial circulating cooling water, the increasing number of microorganisms will affect heat transfer effect of heat pipes and reduce pipeline service life. The best sterilization doses of four common monomeric biocides in 4 times concentrated water from a Tianjin reclaimed water plant were measured by plate count method. Two kinds of compound biocides were obtained by the orthogonal test at the best doses, and the sterilization effect of the compound biocides was verified through the dynamic experiments. The results showed that the best doses of four kinds of biocides were： stabilized chlorine dioxide and sodium hypochlorite 6 mg/L, isothiazolinone 95 mg/L, geramine 120 mg/L respectively in the condition of the quantity of heterotrophic bacteria about 106 CFU/mL, and the inactivation rate of heterotrophic bacteria was over 94% when used only one of these biocides. The two kinds of compound biocides were ： ① stabilized chlorine dioxide 3 mg/L, isothiazolinone 50 mg/L, geramine 30 mg/L and ② stabilized chlorine dioxide 4 mg/L, isothiazolinone 40 mg/L, sodium hypochlorite 2 mg/L. Their disinfecting rates were more than 99%. The dynamic test indicated that the disinfecting time of the two kinds of compound biocides could last more than 7 d and bactericidal effect was good when the quantity of heterotrophic bacteria was about 107 CFU/mL. The first kind of compound biocide is more suitable for power plant circulating cooling system sterilization after considering economic factors.

关 键 词：再生水 循环冷却水 杀生剂 杀菌率 

分 类 号：X703[环境科学与工程—环境工程]