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Bromate formation and BAC removal in drinking water treatment process
M.ASAMI,T.AIZAWA,T.MORIOKA,N.HASHIMOTO,W.NISHIJIMA,A.TABATA,Y.MAGARA 嶺南大學校 環境問題硏究所 1997 環境硏究 Vol.17 No.1
AbstractOzonation of water that has been effected by seawater intrusion or bromide contamination, inevitably results in significant bromate formation. Seasonal changes in bromate formation in water containing a high concentration of bromide were investigated at an experimental ozonation plant. When operational ozone conditions were set to maintain ozone residue at a constant level, bromate formation was significantly correlated with temperature, E260, color, and ozone dose. In GAC(granular activated carbon) column experiments, the bromate removal rate apparently decreased during transition from GAC to BAC (biological activated carbon) following ozonation. Batch experiments confirmed GAC's capacity and BAC's inability to reduce bromate ions to bromide ions. Ozonation conditions must be optimized to minimize bromate and other by-products'formation while maintaining target levels of substance removal.
BEHAVIOR AND ASSESSMENT OF PESTICIDES IN DRINKING WATER PRODUCTION SYSTEM
AIZAWA,Takako,MAGARA,Yasumoto 嶺南大學校 環境問題硏究所 1995 環境硏究 Vol.15 No.1
The concentration of the pesticides remaining in river water and raw water for tap water supply, located in agricultural area, was measured. As a result, 11 kinds of pesticides were detected. The residual pesticides in water was also degraded by chlorination because of chlorine was a strong oxidant that did not exist in natural condition, and produced by-products. The organo-phosphate pesticides that have P=S bond were easily degraded and produced oxons (P=O) as primary byproduct. Thiobencarb was also degraded by chlorination, and produced chlorobenzyl alcohol, chlorotoluene, chlorobenzyl chloride, chlorobenzoic acid and chlorobenzyl aldehyde as chlorination byproducts. Also, when thiobencarb was detected in raw water, the above byproducts were detected in the filtrated water in a purification plant for water supply. Therefore, the management and control of pesticides in drinking water and ambient water quality management should be scoped the chlorination byproducts.