Control of bromate and THM precursors using ozonation combined system.
OBJECTIVE
To investigate the feasibility of reducing THM precursors and controlling bromate taste and odor in drinking water taken from the Yellow River by an ozonation combined system.


METHODS
The appropriate ozone dosage was determined, and then the changes of TOC, UV254 and THM formation potential (THMFP) in the combined system were evaluated.


RESULTS
One mg/L ozone could effectively remove taste and odor and meet the maximum allowable bromate level in drinking water. The pre-ozonation increased THMFP, but the conventional treatment system could effectively reduce the odor. The bio-ceramic filter could partly reduce CHCl3FP, but sometimes might increase CHCl2BrFP and CHClBr2FP. The biological activated carbon (BAC) filter could effectively reduce CHCl3FP and CHCl2BrFP, but increase CHClBr2FP. Compared with other filters, the fresh activated carbon (FAC) filter performed better in reducing THMFP and even reduced CHClBr2FP.


CONCLUSIONS
The combined system can effectively reduce taste, odor, CHCl3FP, and CHCl2BrFP and also bring bromate under control.
Department of Environmental Sciences, College of Environmental Sciences, Peking University, Beijing 100871, China.
Shu-Guang
SG
Xie
Dong-Wen
DW
Shi
Dong-Hui
DH
Wen
Rui
R
Wang
Dan-Li
DL
Xi
D001959:Bromates / Q000737:chemistry* / Q000302:isolation & purification*; D002681:China; D002713:Chlorine; D006801:Humans; D009812:Odorants / Q000032:analysis / Q000517:prevention & control; D010126:Ozone / Q000737:chemistry* / Q000494:pharmacology*; D045483:Rivers / Q000737:chemistry; D013649:Taste; D022882:Trihalomethanes / Q000737:chemistry* / Q000302:isolation & purification*; D014881:Water Supply / Q000032:analysis* / Q000592:standards
D001959:Bromates; D022882:Trihalomethanes; D002713:Chlorine; D010126:Ozone