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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.
Development of membrane filtration technology and its application to water supply
Kunikane, Shoichi,Itoh, Masaki,Magara, Yasumoto 嶺南大學校 環境問題硏究所 1998 環境硏究 Vol.18 No.1
Abstract 'MAC 21' and 'New 21' Projects were implemented for the development of membrane technology in Japan. 'MAC 21' Project included a series of pilot-scale experiment on micro- and ultrafiltration (MF and UF, respectively). As the result, it has been shown that MF and UF are excellent in the removal of turbidity and bacteria. 'New MAC 21' Project included various pilot-scale experiments on 1) nanofiltration (NF) after MF/UF, and 2) MF/UF combined with advanced treatment processes such as activated carbon treatment, ozonation and biological treatment. As the result, it has been shown that both of these two treatment systems can remove organic contaminants such as precursors of disinfection by-products well, and, especially, NF is excellent in their removal.
Assessment and Control of Health Risk Attributable to Drinking Water
ASAMI, Mari,AIZAWA, Takako,KUNIKANE, Shoichi,MAGARA, Yasumoto 영남대학교 환경문제연구소 2000 環境硏究 Vol.20 No.1
Control of health risk attributable to drinking water must achieve on a new stage toward new century. Microbial risk and chemical risk emerged from drinking water are estimated from survey of existing cases and analytical data of chemicals. The number of cases reported as accidental microbial and protozoa infected diseases occurred in recent 15 years all over Japan are reexamined and summed up to estimate microbial health risk due to drinking water. Approximately 35,300 cases are reported to be infected from water, especially from drinking water. This is calculated as 1.96 × 10-5 cases per year. Most of the outbreaks were emerged from small systems, such as private well or water tank while the number of patients infected through waterworks was over one third of the cases. Considering risk from chemicals, disinfection-by-products, DBPs, are generated in disinfection and oxidation processes, and they are of high general concern. A comparison of alternative disinfectants is presented with sum total of risk from DBPs and disinfection potential. Not only trihalomethanes and haloacetic acids produced in chlorination bromate is produced during ozonation of bromide-containing water. In case of ozonation of highly bromide-containing water, major portion of estimated cancer risk is accounted for bromate. Keys to minimize microbial risk and chemical risk from DBPs, lie in better rejection of micropollutants, multiple disinfection barrier and periodical inspection of water quality.