超声协同控制污水厂紫外消毒出水大肠杆菌光复活的实验研究(英文)

污水厂出水经紫外(UV)消毒后存在微生物光复活现象,为此考查了超声(US)协同控制紫外消毒出水大肠杆菌光复活的效果。经研究发现:紫外辐照剂量与城市污水厂二级处理出水中的大肠杆菌灭活率具有良好的线性关系,相关系数达到0.99;超声作为预处理协同紫外作用时,在能耗相等时,使大肠杆菌1h内光复活率降低了59%,在光复活率基本相等的情况下,使能耗降低50%;从经济性及水质的微生物安全性考虑,可采用US-UV作为污水厂出水消毒的技术。

城镇污水处理厂进水抗生素抗性基因的控制与削减研究

抗生素抗性基因对人类健康和生态环境存在巨大隐患,城市污水处理厂肩负着控制抗生素抗性基因的重任。本文介绍了国内外城市污水处理厂对控制抗生素抗性基因的研究概况,重点综述并比较污水处理厂中不同消毒技术和深度处理技术对抗生素抗性基因控制的现状和发展,在此基础上提出结论和展望,以期为城市污水处理厂抗生素抗性基因的有效控制提供技术支撑。

Impact of Suspended Particles and Enhancement Techniques on Ultraviolet Disinfection of a Secondary Effluent

The concentration of suspended solids in the secondary effluent often varies widely, leading to frequent adjustment of the UV dosage to meet the disinfection criterion. In addition, a desired disinfection rate is difficult to achieve sometimes. The authors studied the particle size distribution, contribution of particle-associated Fecal Coliform (F.C.), and their influences on UV disinfection. A combined disinfection process (chlorination with a subsequent UV disinfection) was tested to improve the disinfection effect. The results indicated that the content of suspended solids, especially that of large particles, has a strong impact on UV disinfection efficiency; D>10 μm particles associated F.C. are difficult to be disinfected and are the main part of the tailings of F.C. inactivation curves. Pre-chlorination could decrease the number of particles in the secondary effluent and transform the large particles into small ones, reducing the influence of particles on UV disinfection and enhancing the resistance ability of the combined process to particle loading.