臭氧-氯顺序灭活地下水源水中真菌的效能

Sequential inactivation of fungi in drinking groundwater by ozone and chlorine

以地下水源水中真菌为研究对象,研究了单独氯灭活、单独臭氧灭活以及臭氧-氯顺序灭活的灭菌效果,并用Berenbaum公式判断了2种消毒剂联合作用的性质,同时考察了预臭氧浓度和预臭氧时间对灭活效果的影响。结果表明:单独氯灭活时,当Ct=40 min·mg·L-1时,真菌存活率仅为7%;单独臭氧灭活时,当Ct=9 min·mg·L-1时,真菌存活率仅为10%;与单独消毒剂灭活相比,臭氧-氯顺序灭活对真菌的灭活效果更明显,1.0 mg·L-1臭氧作用1 min后接2.0 mg·L-1氯作用5 min,真菌存活率仅为11.7%;用Berenbaum公式计算得出臭氧和氯顺序灭活真菌是一种协同作用,且随着预臭氧浓度的增大、预臭氧时间的延长,灭活效果越好,协同作用越强。

The inactivation of fungi in groundwater was studied. Individual ozone disinfection, individual chlorine disinfection, and sequential disinfection with ozone, followed by free chlorine were examined. The char- acteristic of sequential disinfection was examined by the Beranbaum formula. Furthermore, the influence of ozone concentration and contact time on sequential disinfection is discussed. Only 7% of fungi could survive with the Ct value of 40 min · mg ·L-1 by individual chlorine disinfection. 10% of fungi could survive with the Ct value of 9 min ·mg · L-1 by individual ozone disinfection. However, 11.7% of fungi could survive by 1 rain action of 1.0 mg· L-1 ozone pretreatment, followed by 5 min action of 2.0 mg· L-1 chlorine, which is much lower than the survival rate of individual chlorine and ozone disinfection. The sequential disinfection of ozone and chlorine for inactivating fungi has a synergistic effect, which is enhanced with the increase of the ozone concentration and the contact time.