摘要
根据二次供水系统水质和水力条件的特点,采用二次消毒方式对消毒剂进行补充,研究了二氧化氯投加量、水力停留时间、生活给水的水温(8/20℃)、COD_(Mn)以及pH对二氧化氯和亚氯酸盐的影响,考察了生活热水的二氧化氯和亚氯酸盐的变化规律。结果表明,投加0.2 mg/L二氧化氯作为补充消毒剂时,二次供水的微生物指标可以满足水质的要求;降低二氧化氯投量、减少生活给水水力停留时间和生活热水的加热时间、控制二次供水的COD_(Mn)含量和pH,可有效降低亚氯酸盐的生成量。研究结果为二次供水系统中消毒剂补充投加与含量变化规律提供了依据,为保障二次供水系统的生物安全性和化学安全性提供了技术支持。
According to the characteristics of water quality and hydraulic conditions of secondary water supply systems （ domestic water supply and hot water supply） , secondary disinfection method is used to replenish the disinfectant. The effects of chlorine dioxide dosage, hydraulic retention time, water temperature （8/20 ℃ ） , C0Dmh and pH was investigated using a static experiment which conducted in secondary water. The results indicate that when adding 0.2 mg/L chlorine dioxide as a supplementary disinfectant, microbial indicators of second water supply can meet the requirements of the standard of drinking water health standards; Reducing the dosage of chlorine dioxide, domestic water supply HRT and domestic hot water heating time, controling C0Dmh secondary water content and pH, can effectively reduce the amount of chlorite. The results of disinfectant dosing and content variation provide the basis for biological and chemical safety to protect the secondary water supply system technically.
出处
《净水技术》
CAS
2017年第7期13-19,26,共8页
Water Purification Technology
基金
国家科技重大专项课题(2014ZX07406002)
北京市教育委员会资助(PXM2015_014204_500266)
关键词
安全消毒
二次供水
二次消毒
二氧化氯
亚氯酸盐
safe disinfection
secondary water supply
secondary disinfection
chlorine dioxide
chlorite
