[Removal characters of ozone-biological activated carbon process for typical pollutants in southern brooky regions of China].
The products of relative molecular weight (Mr) distribution, bromate (BrO3(-)) and trihalomethanes (THMs) were studied by ozone-biological activated carbon (O3-BAC) process for treating organic matters and bromide (Br(-)) in water source of southern brooky regions of China. The experimental results showed that dissolved organic matters (DOC) with Mr lower than 10(3) accounted for 80% of the total. The removal rate of DOC and SUVA (UV254/DOC) were 8% and 14% respectively by traditional treatment process with main removalonly for ones with Mr higher than 100 x 10(3). Only 30% of DOC and 31% of SUVA were decreased by O3-BAC process for the removal of ones with Mr between 10(3) and 5 x 10(3), in which the biotic degradation was certainly restricted by predominant organic matters of hydrophilic and Mr was lower than 1000. An obvious increase of BrO3(-) occurred in the effluent from ozone oxidation process when the dose of ozone beyond 2 mg/L which increased Br(-) concentration. This could increase the product of BrO3(-). A poor and unstable removal effect of BrO3(-) was observed in the effluent of BAC process during the experiment. Each species of THMs, decreasing 40% of total, was reduced by O3-BAC treatment compared with the traditional treatment process. But the products of brominated trihalomethanes, especially CHBr3 would be markedly increased by enhanced chlorine dosage and Br(-) concentration.
Lin
Tao
T
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China. hit_lintao@sina.com
Chen
Wei
W
Wang
Lei-Lei
LL
D001959:Bromates / Q000302:isolation & purification*; D002606:Charcoal / Q000737:chemistry; D002681:China; D005618:Fresh Water / Q000032:analysis*; D010126:Ozone / Q000737:chemistry*; D045483:Rivers; D022882:Trihalomethanes / Q000302:isolation & purification*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
D001959:Bromates; D022882:Trihalomethanes; D014874:Water Pollutants, Chemical; D002606:Charcoal; D010126:Ozone