[Study on the combination of preozonation and post-ozonation-BAC process for drinking water treatment].
This study was conducted to illustrate the effectiveness of preozonation or O3-BAC or combination of these two process in controlling DBPs for treating a dam source water in South China through SBR and continuous flow (200 L/h) experiments and the variables in the treatment train included the point of preozonation with respect to coagulation; the point of ozonation with respect to BAC, the ozone dosage required for preozonation and the Br- content of raw water. Results indicated the reduction in DBP formation potential closely paralleled the reduction in UV absorbance, and trihalomethane and haloacetic acid formation potential can be removed under a dose of preozone at 0.5 - 1.0 mg/L, at the same time, ozone by-products (bromate and formaldehyde) can be controlled in low level. The continuous flow experiment results show that combination of preozonation and O3-BAC process has obviously positive effects on the removals of particles with a size above 2 microm, COD(Mn), and TOC. However, DBPs formation can be controlled by the removal of organic matters.
Guo
Zhao-hai
ZH
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Yang
Min
M
Zhang
Yu
Y
Pei
Yi-shan
YS
Zhang
Jun-zhi
JZ
Hirotsuji
Juni
J
D002606:Charcoal / Q000737:chemistry; D017606:Chlorine Compounds / Q000032:analysis*; D004202:Disinfectants / Q000009:adverse effects*; D010126:Ozone / Q000737:chemistry; D018508:Water Purification / Q000379:methods*; D014881:Water Supply / Q000032:analysis*
D017606:Chlorine Compounds; D004202:Disinfectants; D002606:Charcoal; D010126:Ozone