三级逆流臭氧接触器中羟基自由基暴露的估计——霉味化合物的减少和溴酸盐的形成

IF 2.1 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
Kyohei Uchigami, Hideyasu Nakamura, Kazuo Ogura, T. Mizuno
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引用次数: 0

摘要

阪神水务局是日本第一家运营两个饮用水处理厂的散装水供应商。这两个工厂都采用臭氧化过程来减少霉味化合物,2-甲基异龙脑和土臭素,以及三卤甲烷。在这项研究中,我们的目的是估计在稻川饮用水处理厂应用的三级逆流臭氧接触器中的羟基自由基(HO∙)暴露。我们估计HO∙暴露量为臭氧暴露量乘以RCt值的乘积,即HO∙暴露量与臭氧暴露量的比值。臭氧暴露是通过我们之前开发的一种方法来估计的,并且在本研究中对RCt值进行了实验评估。在我们的研究期间,整个接触器的估计HO∙暴露范围为0.4 × 10−10至6.7 × 10−10 M·s。最高HO∙暴露6.7 × 10−10 M·s时,霉味化合物的还原率超过95%。在这些暴露下,检测到的溴酸盐浓度为6微克/升,相当于日本饮用水水质标准的60%浓度水平。此外,我们试图平衡减少霉味化合物与控制溴酸盐的形成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Estimation of Hydroxyl Radical Exposure in a three-stage Countercurrent Ozone Contactor – Reduction in Musty Odor Compounds and Formation of Bromate
ABSTRACT The Hanshin Water Supply Authority is the first bulk water supplier in Japan that currently operates two drinking water treatment plants. Both plants employ an ozonation process for the reduction of musty odor compounds, 2-methylisoborneol and geosmin, and trihalomethanes. In this study, we aim to estimate hydroxyl radical (HO∙) exposure in a three-stage countercurrent ozone contactor applied at the Inagawa drinking water treatment plant. We estimated the HO∙ exposure as the product of the ozone exposure multiplied by the RCt value, that is, the ratio of the HO∙ exposure to the ozone exposure. The ozone exposure was estimated by a methodology we developed earlier, and the RCt values were experimentally evaluated in this study. The estimated HO∙ exposure ranged from 0.4 × 10−10 to 6.7 × 10−10 M·s across the contactor during our research period. The highest HO∙ exposure of 6.7 × 10−10 M·s indicated that the reduction ratio of musty odor compounds exceeded 95%. At these exposures, the detected concentration of bromate was 6 µg/L, which is equal to the 60% concentration level of Japan’s water quality standard for drinking water. Further, we attempt to balance the reduction in musty odor compounds with control of bromate formation.
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来源期刊
Ozone: Science & Engineering
Ozone: Science & Engineering 环境科学-工程:环境
CiteScore
5.90
自引率
11.10%
发文量
40
审稿时长
2 months
期刊介绍: The only journal in the world that focuses on the technologies of ozone and related oxidation technologies, Ozone: Science and Engineering brings you quality original research, review papers, research notes, and case histories in each issue. Get the most up-to date results of basic, applied, and engineered research including: -Ozone generation and contacting- Treatment of drinking water- Analysis of ozone in gases and liquids- Treatment of wastewater and hazardous waste- Advanced oxidation processes- Treatment of emerging contaminants- Agri-Food applications- Process control of ozone systems- New applications for ozone (e.g. laundry applications, semiconductor applications)- Chemical synthesis. All submitted manuscripts are subject to initial appraisal by the Editor, and, if found suitable for further consideration, to peer review by independent, anonymous expert referees.
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