- 著者
- Sulfikar Ryo Honda Mana Noguchi Ryoko Yamamoto-Ikemoto Toru Watanabe
- 出版者
- Japan Society on Water Environment
- 雑誌
- Journal of Water and Environment Technology (ISSN:13482165)
- 巻号頁・発行日
- vol.16, no.2, pp.94-105, 2018 (Released:2018-04-10)
- 参考文献数
- 51
- 被引用文献数
- 14
The influent of municipal wastewater treatment plants (WWTP) can contain micropollutants such as antibiotics, chlorine, detergents, and biocides. In vitro studies have shown that these micropollutants may induce antibiotic resistance in bacteria. Previous studies have reported increases or decreases of antibiotic-resistant bacteria between the influent and effluent of WWTP in an unpredictable manner. Thus, the triggers of resistance induction in WWTP are largely unknown. To investigate the effects of unit operations in WWTP on antibiotic resistance induction, we incubated sixteen strains of Escherichia coli susceptible to amoxicillin or norfloxacin under simulated conditions of the primary sedimentation tank, aeration tank and final sedimentation tank in sterilized and filtered wastewater from each tank at 25°C for 1, 6 and 2 hours, respectively, which are typical hydraulic retention time of each tank. The minimum inhibition concentration towards amoxicillin or norfloxacin was compared before and after incubation to evaluate the occurrence of induction. We found that resistance to both antibiotics was more likely to increase in the aeration tank than in the primary sedimentation tank or final sedimentation tank. The longer contact time with the wastewater and the aeration are factors that appeared to induce antibiotic resistance in an activated sludge process.
- 著者
- Toru WATANABE Takayuki MIURA Tsukasa SASAKI Satoshi NAKAMURA Tatsuo OMURA
- 出版者
- Japan Society of Civil Engineers
- 雑誌
- ENVIRONMENTAL ENGINEERING RESEARCH (ISSN:13415115)
- 巻号頁・発行日
- vol.43, pp.245-254, 2006-11-17 (Released:2011-06-27)
- 参考文献数
- 12
- 被引用文献数
- 1
メコン流域の一部の地域では, 安全な水供給を目的として, 先進国と同様に浄水場と管路網からなる広 域水道と, 集落単位で地下水をくみ上げて配水する簡易な水道 (集落水道) がそれぞれ整備されている。これらの水供給システムによる感染リスク低減効果を明らかにするために, 2つのケーススタディを実施した。タイにおけるケーススタディでは, 広域水道と集落水道の整備地域で, 飲用水起因の感染症のリスクを比較した。その結果, 塩素消毒後の安全な水が供給される広域水道整備地域のリスクは, 集落水道整備地域の約1/8であった。カンボジアにおけるケーススタディでは, 集落水道整備地域と水道未整備地域のリスクを比較し, 集落水道整備地域の方が1/5程度にリスクが低下する結果を得た。