徐州市市区城市污水处理厂消毒存在的问题与解决办法
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摘要
通过对徐州市区10家污水处理厂的消毒工艺现状进行阐述,对紫外线灭菌效果、消毒影响因素、消毒后粪大肠菌群的光复活、紫外线消毒的原理与优缺点,次氯酸钠消毒的原理及优缺点进行分析。紫外线和次氯酸钠联合消毒采用先紫外消毒再投加次氯酸钠,效果最佳为紫外线照射5 s和次氯酸钠投加量1 mg/L。10家污水处理厂大多采用紫外线照射进行消毒,细菌存在光复活现象,紫外线照射超过10 s,将增加紫外灯的成本,单纯使用次氯酸钠消毒,厂方为了达标次氯酸钠的投加量较大,尾水中副产物较多,根据污水处理厂实际工艺情况,对紫外线+次氯酸钠联合消毒的经济可行性进行分析。
This paper described the status of disinfection technology of 10 sewage treatment plants in Xuzhou city,analyzed the effects of ultraviolet(UV)sterilization,influencing factors of disinfection,light regeneration of fecal coliforms after disinfection, the principles and advantages or disadvantages of ultraviolet disinfection and sodium hypochlorite disinfection. The combined disinfection is to apply ultraviolet disinfection before adding sodium hypochlorite,and the optimum conditions are:UV radiation time 5 s and adding dose of sodium hypochlorite 1 mg/L. Most of the 10 sewage treatment plants in Xuzhou are sterilized by ultraviolet radiation. If the irradiation time is short,bacteria have light reactivation,while prolonged exposure to UV rays exceeding 10 s will increase the cost of UV lamp. If only sodium hypochlorite was used for disinfection,in order to meet the standard,the factory had to add more sodium hypochlorite and produced more by-products in tail water. According to the actual treatment process situation of sewage plants,the economic feasibility of the combined disinfection process is analyzed.
This paper described the status of disinfection technology of 10 sewage treatment plants in Xuzhou city,analyzed the effects of ultraviolet(UV)sterilization,influencing factors of disinfection,light regeneration of fecal coliforms after disinfection, the principles and advantages or disadvantages of ultraviolet disinfection and sodium hypochlorite disinfection. The combined disinfection is to apply ultraviolet disinfection before adding sodium hypochlorite,and the optimum conditions are:UV radiation time 5 s and adding dose of sodium hypochlorite 1 mg/L. Most of the 10 sewage treatment plants in Xuzhou are sterilized by ultraviolet radiation. If the irradiation time is short,bacteria have light reactivation,while prolonged exposure to UV rays exceeding 10 s will increase the cost of UV lamp. If only sodium hypochlorite was used for disinfection,in order to meet the standard,the factory had to add more sodium hypochlorite and produced more by-products in tail water. According to the actual treatment process situation of sewage plants,the economic feasibility of the combined disinfection process is analyzed.
引文
[1]北京水环境技术与设备研究中心,北京市环境保护研究院,国家城市环境污染防治工程技术研究中心.三废处理工程技术手册——废水卷[M].北京:化学工业出版社,2000.
[2]国家环境保护总局,国家质量监督检验检疫总局.城镇污水处理厂污水排放标准(GB 18918-2002)[S]. 2002.
[3]扈庆,李显芳.污水处理厂消毒方式探讨[J].广东化工,2012,39(3):135.
[4]宋文玲,钱谊,苏晓星.大丰风电场建设对盐城自然保护区的生态影响分析[J].环境监测管理与技术,2011,23(4):23-36.
[5]张惠华.污水处理厂利用次氯酸钠消毒实验研究[J].广东化工,2012(12):118-119.
[2]国家环境保护总局,国家质量监督检验检疫总局.城镇污水处理厂污水排放标准(GB 18918-2002)[S]. 2002.
[3]扈庆,李显芳.污水处理厂消毒方式探讨[J].广东化工,2012,39(3):135.
[4]宋文玲,钱谊,苏晓星.大丰风电场建设对盐城自然保护区的生态影响分析[J].环境监测管理与技术,2011,23(4):23-36.
[5]张惠华.污水处理厂利用次氯酸钠消毒实验研究[J].广东化工,2012(12):118-119.