再生水紫外线/二氧化氯联合消毒效果试验研究

STUDY OF THE COMBINED INFECTION EFFECT OF ULTRAVIOLET AND CHLORINE DIOXIDE ON RECYCLED WATER

紫外线及二氧化氯作为绿色消毒技术的代表,被越来越多地研究和使用,ClO_2消毒能够弥补UV不能提供持续消毒能力的不足,UV消毒作为ClO_2消毒的预处理工艺,能够降低后续消毒工艺的微生物负荷。通过试验对联合消毒效果进行了研究。试验表明,在试验水质条件下,当紫外线剂量为60 m J/cm^2,二氧化氯投加量2 mg/L,反应时间15min时即可达到较好的消毒效果且成本较低,消毒后粪大肠菌在48 h内几乎不发生光复活。

Ultraviolet （UV） and chlorine dioxide （ClO2 ）, as the representatives of environment-friendly disinfection technologies, were studied and applied widely in recent sterilization field. ClO2 is capable of making up the incapacity of UV for providing sustained sterilization. Moreover, as the pretreatment measure of ClO2, UV infection is able to reduce the load of subsequent microorganism. This study focused on the combined effect of the two infection methods, which demonstrated that under the condition of the tested water quality, 60 mJ/cm2 of UV, 2 mg/L of ClO2 （content） and 15 minutes of reaction, the sterilization effect was preferable with comparatively lower cost, and fecal coliform almost didn＇t show photoreactivation within 48 hours after disinfection.