Corn starch-based treatment improves rainwater quality

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dc.contributor.authorNakada, Liane Yuri Kondo
dc.contributor.authorMoruzzi, Rodrigo Braga [UNESP]
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-12-11T17:01:45Z
dc.date.available2018-12-11T17:01:45Z
dc.date.issued2015-12-01
dc.description.abstractRainwater harvesting can provide an alternative water source, which may demand little treatment, depending on the end use. Some starches have been used in water treatment as coagulant/ flocculant/filtration aid, and might be applied as primary coagulant. Here, we show direct filtration with hydraulic rapid mixing, using 2-6 mg L-1 cationic corn starch as primary coagulant, considerably improves roof-harvested rainwater quality, achieving removal efficiencies of up to 71.7% of apparent colour, 78% of turbidity, 1.1 log-unit of total coliform, and 1.6 log-unit of Escherichia coli, meeting guidelines for turbidity, even for potable purposes. Cationic corn starch has proved to be a suitable primary coagulant when filtration is performed in a single-layer sand filter (coefficient of uniformity: 1.8, effective particle size: 0.52 mm), at hydraulic loading rate of 450 m day-1. However, a disinfection unit is required to meet an absence of faecal coliform.en
dc.description.affiliationDepartamento de Saneamento e Ambiente Faculdade de Engenharia Civil Arquitetura e Urbanismo Universidade de Campinas (UNICAMP) Cidade Universitária, Avenida Albert Einstein, 951
dc.description.affiliationInstituto de Geociências e Ciências Exatas UNESP - Universidade Estadual Paulista Departamento de Planejamento Territorial e Geoprocessamento, Avenida 24 A, 1515 Bela Vista
dc.description.affiliationUnespInstituto de Geociências e Ciências Exatas UNESP - Universidade Estadual Paulista Departamento de Planejamento Territorial e Geoprocessamento, Avenida 24 A, 1515 Bela Vista
dc.format.extent1326-1333
dc.identifierhttp://dx.doi.org/10.2166/ws.2015.097
dc.identifier.citationWater Science and Technology: Water Supply, v. 15, n. 6, p. 1326-1333, 2015.
dc.identifier.doi10.2166/ws.2015.097
dc.identifier.issn1606-9749
dc.identifier.scopus2-s2.0-84960863486
dc.identifier.urihttp://hdl.handle.net/11449/172685
dc.language.isoeng
dc.relation.ispartofWater Science and Technology: Water Supply
dc.relation.ispartofsjr0,258
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectCorn starch
dc.subjectDirect filtration
dc.subjectFull-scale rainwater treatment
dc.subjectRainwater harvesting
dc.titleCorn starch-based treatment improves rainwater qualityen
dc.typeArtigo

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Artigos - Planejamento Territorial e Geoprocessamento - IGCE