Action of chlorine, peracetic acid, UV-LED radiation, and advanced oxidation process on Giardia lamblia cysts for reclaimed water production

IF 3 4区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
L. P. Leonel, A. L. Tonetti
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引用次数: 0

Abstract

Resistant pathogens such as the protozoa Giardia lamblia are frequently identified in effluents from wastewater treatment plants, even after the disinfection process, threatening the safe practice of agricultural effluent reuse. The high resistance of Giardia cysts is conferred by their wall, a rigid extracellular component formed by carbohydrate and protein molecules arranged in two layers. Thus, this study aimed to evaluate the action of chlorine, peracetic acid, ultraviolet (UV) radiation, and an advanced oxidation process (AOP), which consist in the association between UV radiation and hydrogen peroxide, on Giardia lamblia cysts, artificially inoculated in samples of treated domestic wastewater, to produce reclaimed water safe for agricultural irrigation. The 4 disinfectants evaluated showed effective action against Giardia cysts, demonstrated by the formation of morphological damage on the cyst wall, and the best performance was achieved by the AOP, using 15 mg L−1 of H2O2 associated with 103 mJ cm−2 of UV radiation, emitted by light-emitting diodes (LEDs), at wavelengths of 255/280/400 nm. Understanding how different disinfecting agents act on pathogenic organisms in complex matrices such as domestic wastewater is fundamental for the process of choosing the treatment to be used to produce reclaimed water.

氯、过氧乙酸、UV-LED辐射和高级氧化工艺对再生水生产中贾第鞭毛虫囊的作用
即使在消毒过程之后,也经常在废水处理厂的流出物中发现诸如原生贾第鞭毛虫之类的耐药病原体,威胁到农业废水回用的安全做法。贾第鞭毛虫囊的高抗性是由它们的细胞壁赋予的,细胞壁是由碳水化合物和蛋白质分子排列成两层形成的坚硬的细胞外成分。因此,本研究旨在评价氯、过氧乙酸、紫外线(UV)辐射和过氧化氢之间的关联,以及一种高级氧化工艺(AOP)对人工接种于生活废水样品中的兰第鞭毛虫囊的作用,以生产安全的农业灌溉再生水。结果表明,4种消毒剂对贾第鞭毛虫包囊均有较好的杀灭效果,并在包囊壁上形成形态损伤,其中以15 mg L−1 H2O2和103 mJ cm−2紫外辐射(波长为255/280/400 nm)的AOP效果最佳。了解不同消毒剂如何作用于复杂基质(如生活废水)中的病原生物,对于选择用于生产再生水的处理方法至关重要。
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来源期刊
CiteScore
5.60
自引率
6.50%
发文量
806
审稿时长
10.8 months
期刊介绍: International Journal of Environmental Science and Technology (IJEST) is an international scholarly refereed research journal which aims to promote the theory and practice of environmental science and technology, innovation, engineering and management. A broad outline of the journal''s scope includes: peer reviewed original research articles, case and technical reports, reviews and analyses papers, short communications and notes to the editor, in interdisciplinary information on the practice and status of research in environmental science and technology, both natural and man made. The main aspects of research areas include, but are not exclusive to; environmental chemistry and biology, environments pollution control and abatement technology, transport and fate of pollutants in the environment, concentrations and dispersion of wastes in air, water, and soil, point and non-point sources pollution, heavy metals and organic compounds in the environment, atmospheric pollutants and trace gases, solid and hazardous waste management; soil biodegradation and bioremediation of contaminated sites; environmental impact assessment, industrial ecology, ecological and human risk assessment; improved energy management and auditing efficiency and environmental standards and criteria.
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