| Full text | |
| Author(s): |
Total Authors: 2
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| Affiliation: | [1] Univ Campinas UNICAMP, Fac Engn Civil Arquitetura & Urbanismo, Dept Saneamento & Ambiente, Ave Albert Einstein 951, Cidade Univ, BR-13083852 Sao Paulo - Brazil
[2] UNESP Univ Estadual Paulista, Inst Geociencias & Ciencias Exatas, Dept Planejamento Terr & Geoprocessamento, BR-13506900 Sao Paulo - Brazil
Total Affiliations: 2
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| Document type: | Journal article |
| Source: | WATER SCIENCE AND TECHNOLOGY-WATER SUPPLY; v. 15, n. 6, p. 1326-1333, DEC 2015. |
| Web of Science Citations: | 0 |
| Abstract | |
Rainwater 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. (AU) | |
| FAPESP's process: | 09/11726-7 - Study and evaluation of rainwater treatment for non-potable uses employing pressure filter with different filter beds and corn starch as primary coagulant |
| Grantee: | Liane Yuri Kondo Nakada |
| Support Opportunities: | Scholarships in Brazil - Master |