Desempenho de sistema de dupla filtração para clarificação de água
With the frequent difficulty both due to lack of water availability and quality, new treatment technologies aimed at ensuring water quality in supply and better use of water resources have been the target of research and development for some years. Double filtration, characterized by the use of dire...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/37075 |
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| Resumo: | With the frequent difficulty both due to lack of water availability and quality, new treatment technologies aimed at ensuring water quality in supply and better use of water resources have been the target of research and development for some years. Double filtration, characterized by the use of direct upward filtration as a pretreatment for downward filtration, can be considered as one of the most promising technologies for water treatment. This work consisted in evaluating the performance of a double filtration pilot plant in the treatment of moderate color and low turbidity surface water. The research was carried out in two phases: in the first one, it were performed characterization tests of the raw water of the spring (Jiqui lake, Parnamirim-RN) and jar test assays to define the optimal dosage of the oxidant (chlorine gas). The coagulant (aluminum hydroxychloride) dose was fixed at 10 mg / L. In the second stage, the tests were started in the double filtration pilot system, evaluating the efficiency in the removal of apparent color and turbidity parameters. The operation was performed over a period of one month, with a daily duration of eight hours and collection at two-hour intervals, totaling 145 samples. The filtration rates adopted were 144 m³ / m².day for the boulder upward filter and 257 m³ / m².day for the downward filter on sand. Due to the results obtained, it was observed that pre-oxidation improved the effluent quality of the system by removing apparent color, but the overall efficiency of the pilot was not satisfactory. The remaining turbidity and apparent color were above the maximum values established in the Ministry of Health Consolidation Ordinance No. 5/2017, in 92.3% and 40% of the samples, respectively. |
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