密云水库水的预氧化研究

Pretreatment of Raw Water from Miyun Reservior

针对北京密云水库水的水质特征,分别进行了实验室预氧化实验和现场中试研究。室内预氧化实验结果表明,预臭氧化对水中UV254的去除率明显高于高锰酸钾和次氯酸钠,并且还能有效降低原水中的THMFP。在1.0 mg/L臭氧剂量时,嗅味物质MIB的浓度从98.0 ng/L降为73.0 ng/L,去除率为26.0%。中试试验结果表明,预臭氧化工艺与常规工艺的THMFP的去除率分别是25.6%和14.9%,预臭氧化能大幅度杀灭大肠杆菌,去除率高达94%,并能够显著降低砂滤出水颗粒数,从而减少砂滤出水微生物、病原体出现的几率,对改善水质有积极影响。

With reference to safe water supply of Miyun Reservior to Beijing,a pretreatment experiment,on bench and pilot scales,of raw water from the Reservoir was conducted.The experiment in bench scale showed that pre-ozonation was better than the conventional oxidants in terms of decreasing THMFP and UV254;and concentration of MIB（odor substances） dropped from 98.0 ng/L to 73.0 ng/L when using ozone with dosage of 1.0 mg/L.According to the pilot experiment,ozone pre-treatment has improved the operation of the sand filter with higher efficiency in removing THMFP,which implied the reduced probability of detection rates of microorganisms and pathogens.