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 kHz、90 W 超声场处理初始含大肠杆菌菌落数约为 10⁴ CFU/mL 的水样 5min，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59kHz、90W 超声场预处理水样 5min 后，再加入有效氯浓度为 9． 0mg/L 的次氯酸钠溶液反应 30min，大肠杆菌的对数灭活率可达 5． 02，同时余氯浓度低于 4mg/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 10⁴ CFU/mL,a treatment with 59kHz and 90W ultrasonic for 5min 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. 0mg/L for 30min,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 4mg/L,which meets the national standard well.