Cryptosporidium Oocysts Removal by Upflow Direct Filtration: Pilot Scale Assessment
| Autor: | Cristina Celia Silveira Brandão, Marcely Ferreira Nascimento, Yovanka Pérez Ginoris |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Turbidez
lcsh:Hydraulic engineering animal diseases Geography Planning and Development Cryptosporidium Context (language use) 010501 environmental sciences Aquatic Science 01 natural sciences Biochemistry law.invention lcsh:Water supply for domestic and industrial purposes law lcsh:TC1-978 0103 physical sciences parasitic diseases Statistical analysis Raw water Turbidity Filtração Filtration 0105 earth and related environmental sciences Water Science and Technology Cryptosporidium oocysts lcsh:TD201-500 010304 chemical physics biology fungi Pilot scale Partículas - contagem Pulp and paper industry biology.organism_classification upflow direct filtration digestive system diseases turbidity Coarse to fine particle counts Environmental science |
| Zdroj: | Water Volume 12 Issue 5 Water, Vol 12, Iss 1328, p 1328 (2020) Repositório Institucional da UnB Universidade de Brasília (UnB) instacron:UNB |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w12051328 |
| Popis: | Studies on the removal of Cryptosporidium oocysts by direct filtration suggested that high removal efficiencies (> 3.0 log) can be achieved, but the vast majority of the studies focused on the assessment of downflow direct filtration. However, in comparison with downflow direct filtration, filters in upflow direct filtration systems use lower filtration rates, deeper stratified bed, and water flows from coarse to fine sand grain, which may improve the removal of oocysts. In this context, we evaluated the removal of Cryptosporidium oocysts using upflow direct filtration, on a pilot scale, to treat Paranoá Lake water (Brazil) seeded with Cryptosporidium oocysts. The experiments were conducted with raw water with low turbidity (3.2&ndash 5.7 NTU) and induced higher turbidity (28&ndash 30 NTU). Non-parametric statistical analysis was used to verify correlations between the filtered water values and removal of oocysts, particles, and turbidity. In general, no correlation was observed between the parameters analyzed, nor between their removals. The exception was the correlation between residual values of Cryptosporidium oocysts and particles of 2 to 7 µ m during ripening, an aspect that needs further evaluation. Under stable operation, average removal of Cryptosporidium oocysts by upflow direct filtration was > 3.87 log. During ripening, removal of oocysts was around 1 log lower. |
| Databáze: | OpenAIRE |
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