{"title":"Action of chlorine, peracetic acid, UV-LED radiation, and advanced oxidation process on Giardia lamblia cysts for reclaimed water production","authors":"L. P. Leonel, A. L. Tonetti","doi":"10.1007/s13762-024-06170-x","DOIUrl":null,"url":null,"abstract":"<div><p>Resistant pathogens such as the protozoa <i>Giardia lamblia</i> 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 <i>Giardia</i> 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 <i>Giardia lamblia</i> 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 <i>Giardia</i> 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<sup>−1</sup> of H<sub>2</sub>O<sub>2</sub> associated with 103 mJ cm<sup>−2</sup> 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.</p></div>","PeriodicalId":589,"journal":{"name":"International Journal of Environmental Science and Technology","volume":"22 9","pages":"7783 - 7796"},"PeriodicalIF":3.0000,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Environmental Science and Technology","FirstCategoryId":"93","ListUrlMain":"https://link.springer.com/article/10.1007/s13762-024-06170-x","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
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.
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.