摘要
以北京市某污水处理厂的二级出水为研究对象,采用自行研究设计的超声波协同紫外线消毒专利设备进行中试实验研究,分别研究了4个不同功率密度(0,7,35和70 W/L)和3个不同的停留时间(30,45和60 s)下出水中大肠杆菌复活情况。实验结果表明,当开启4盏40 W的紫外灯,超声波功率密度为70 W/L,水力停留时间为60 s时,出水中大肠杆菌的灭活率最高,复活现象较弱,最大复活值为2.8×104CFU/L。实验结果也反映了超声波功率密度和水力停留时间与大肠杆菌复活Log的数学规律,为后续工艺设备的优化和深入研究提供支持。
This pilot study was carried out in one of Beijing wastewater treatment plants. In this study,the secondary effluent was used as feedstock for disinfection. A patented US/UV reactor was self-designed and used in this investigation,in which water flowed in the reactor horizontally. This study focused on Escherichia coli concentrations of effluents under four different power densities（0,7,35 and 70 W/L） and three different hydraulic retention times（30,45 and 60 s）. Results showed that with four UV lamps of 40 W,ultrasound power density of70 W/L,and a hydraulic retention time of 60 s,the best control of inactivation and photo-reactivation of Escherichia coli could be reached. The maximum concentration of Escherichia coli after photo-reactivation was 2. 8 ×104CFU/L. Logarithmic relationship was also drawn between ultrasonic power density and hydraulic retention time for Escherichia coli reactivation,which could provide supports for the subsequent optimization and further study.
出处
《环境工程学报》
CAS
CSCD
北大核心
2015年第9期4107-4111,共5页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(50978027)
关键词
污水厂二级出水
超声波协同紫外线消毒
大肠杆菌
光复活
secondary effluent
ultrasound synergistic ultraviolet disinfection
Escherichia coli
photo-reactivation
