摘要
饮用水传统的氯消毒杀菌往往不彻底且存在余氯过高的问题,文中研究超声场协同强化灭杀饮用水中大肠杆菌的规律与特征,并将超声波技术与次氯酸钠消毒相结合,探究最佳的协同操作条件.实验结果表明:常温下,用59 k Hz、90 W超声场处理初始含大肠杆菌菌落数约为104CFU/m L的水样5 min,大肠杆菌的对数灭活率为0.9;单独加入有效氯浓度为9.0 mg/L的次氯酸钠溶液反应30 min,大肠杆菌的对数灭活率为2.57;用59 k Hz、90 W超声场预处理水样5 min后,再加入有效氯浓度为9.0 mg/L的次氯酸钠溶液反应30 min,大肠杆菌的对数灭活率可达5.02,同时余氯浓度低于4 mg/L,满足国家饮用水标准.
The traditional chlorine disinfection can not effectively disinfect polluted water and may result in exces- sive residual chlorine. In order to solve this problem, ultrasonic field was used to enhance the chlorine disinfection of E. coli in drinking water, and the corresponding laws and features were investigated. Moreover, the optimal con- ditions for the synergy disinfection were determined. Experimental results indicate that （ 1 ） for the water with an initial E. coli density of about 10^4 CFU/mL, a treatment with 59 kHz and 90 W ultrasonic for 5 rain at the room tem- perature may result in an E. coli logarithmic inactivation rate of 0. 9 ; （2） after a treatment in sodium hypochlorite solution with an active chlorine content of 9.0 mg/L for 30 rain, the logarithmic inactivation rate increases to 2.57 ; （3） the synergic disinfection with the two above-mentioned treatment methods helps to obtain a logarithmic inacti- vation rate of 5.02 and a residual chlorine content of less than 4 mg/L, which meets the national standard well.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第6期77-82,共6页
Journal of South China University of Technology(Natural Science Edition)
基金
广东省科技攻关项目(2013B020800004)~~
关键词
氯消毒
超声场
强化杀菌
大肠杆菌
灭活率
饮用水
chlorine disinfection
ultrasonic field
enhanced disinfection
E. coli
inactivation rate
drinking water
