二氧化氯对水中隐孢子虫卵囊的杀灭特性

Characteristics of chlorine dioxide eliminating Cryptosporidium oocyst in water

摘要:

为扩展二氧化氯在饮用水安全中的应用,应用荧光活性染色的检活手段研究了二氧化氯投量、反应时间、温度及pH对安氏隐孢子虫卵囊杀灭效果的影响,并通过扫描电镜观察方法比较了杀灭前后卵囊的形态变化.结果表明:在1.5mg/L和2.5mg/L的投量下作用60min时,杀灭率分别达90%和100%.温度越高杀灭效果越好,当温度从5℃升至30℃时,2mg/LClO2投量下卵囊的杀灭率从54%提高到70%;pH值对杀灭效果影响不大.二氧化氯对于隐孢子虫卵囊有很强的穿透性,杀灭后卵囊形态并未受到严重破坏.二氧化氯可在常规饮用水条件下有效地杀灭隐孢子虫卵囊,从而为工程应用提供理论依据.

Abstract:

In order to extend the application of ClO2 in drinking water safety,the influences of ClO2 dosage,contact time,temperature and pH value on the killing effect of oocyst were investigated using fluorescent staining vital assessing method.SEM was used to study the changes of oocyst shaped in the sterilization process.The results show that the killing rate can reach 90% and 100% at the ClO2 dosages of 1.5 and 2.5 mg/L respectively when the contact time is 60 min.Higher killing rate can be obtained at higher temperature.The killing rate can increase from 54% to 70% when the temperature is raised from 5℃ to 30℃.The effect of pH value is not obvious.By comparing the SEM photos before and after sterilization,it can be found that ClO2 has great penetrability and does not destroy the oocyst surface but transforms the supporting structure.All the results indicate that ClO2 can be used to control Cryptosporidium oocyst in drinking water treatment and they provide a theoretical foundation for the engineering application.