人工污染滤池反冲洗水中细小隐孢子虫卵囊的检测及臭氧中试处理

IF 2.1 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
A. P. Ogura, L. P. Sabogal-Paz
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引用次数: 2

摘要

水传播疾病是公共卫生系统的一个相关问题,因为通常应用的处理技术可能无法去除所有的水污染物。隐孢子虫卵囊是水处理厂的一个问题,因为它们体积小,对消毒过程(如氯化)有抵抗力。此外,保留在过滤介质上的卵囊可能在过滤器反冲洗水中再循环。本研究旨在检测人工接种的小隐孢子虫卵囊,并评价臭氧处理效果。采用碳酸钙絮凝法、直接离心法和7X ICN分散液直接离心法三种浓缩后的免疫磁分离方法制备合成的FBW。选择后一种方法,是因为其对卵囊活力的干扰较小(降低37.2%),初步测定回收率较高(22.1%)。商用混悬液的回收率为15.4±3.3%,而EasySeed®混悬液的分析质量为2.8±0.8%。由于回收率低,特别是在复杂的基质中,原生动物检测的这些限制和方法具有挑战性。最后,在中试规模上进行了FBW臭氧化,碘化丙啶染料显示处理后卵囊活力下降。7.5 mg o3l - 1作用10分钟(即75 mg min L - 1)和10 mg o3l - 1作用5分钟(即50 mg min L - 1)时,卵囊失活率分别为2.83 log和3.44 log。消毒是解决疫情的关键途径,臭氧处理应进一步研究。图形抽象
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Detection of Cryptosporidium Parvum Oocysts in Artificially Contaminated Filter Backwash Water and Ozone Treatment at Pilot Scale
ABSTRACT Waterborne diseases are a relevant concern for public health systems since commonly applied treatment techniques may not remove all water contaminants. Cryptosporidium spp. oocysts are an issue in water treatment plants due to their reduced size and resistance to the disinfection process (e.g., chlorination). Moreover, oocysts retained on the filter media might recirculate amongst the filter backwash water (FBW). This study aimed to detect Cryptosporidium parvum oocysts artificially inoculated on the FBW and evaluate the ozone treatment performance. A synthetic FBW underwent three concentration methods followed by immunomagnetic separation: calcium carbonate flocculation, direct centrifugation, and direct centrifugation with the 7X ICN dispersion solution. The latter method was selected as it presented less interference on oocyst viability (37.2% reduction) and higher recovery (22.1%) on preliminary assays. The recovery for the commercial suspensions was 15.4 ± 3.3%, although the analytical quality performed with EasySeed® suspension obtained a recovery of 2.8 ± 0.8%. These limitations and methodologies for protozoan detection are challenging due to low recoveries, especially in complex matrices. Finally, FBW ozonation was performed on a pilot scale, and the propidium iodide dye indicated oocyst viability decreased after treatment. Oocyst inactivation was 2.83 log and 3.44 log for dosages of 7.5 mg O3 L−1 for 10 min (i.e., 75 mg min L−1) and 10 mg O3 L−1 for 5 min (i.e., 50 mg min L−1), respectively. Disinfection is a crucial pathway for addressing outbreak scenarios, and ozone treatment should be further studied. Graphical abstract
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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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