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| Author(s): |
Emília Kiyomi Kuroda
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Carlos. , gráficos, ilustrações, tabelas. |
| Institution: | Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) |
| Defense date: | 2002-04-26 |
| Examining board members: |
Luiz Di Bernardo;
Cristina Célia Silveira Brandão;
Carlos Gomes da Nave Mendes
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| Advisor: | Luiz Di Bernardo |
| Field of knowledge: | Engineering - Sanitary Engineering |
| Indexed in: | Banco de Dados Bibliográficos da USP-DEDALUS |
| Location: | Universidade de São Paulo. Biblioteca da Escola de Engenharia de São Carlos; EESC/TESE 2880 |
| Abstract | |
This work consists of a performance evaluation of the system composed by direct upflow filtration in gravel followed by rapid downflow filtration in sand. The experimental investigation was accomplished in pilot installation, being varied the filtration rate in the upflow (60 to 240 m3/m2.d.) and downflow (100 to 240 m3/m2.d.) filters with and without execution of intermediate downflushes in the first one. The raw water was provided from a superficial source with pH between 6,5 to 7,5, turbidity values between 8,5 and 21 UT, visible colour between 19 and 50 uH and alkalinity between 6,7 and 10 mg CaC03/L. ln addition, the behavior of the installation was verified, for a simulate condition of turbidity peak occurrence of 380 uT, with short duration. From the obtained results it was possible to accomplish considerations concerning the detachment occurrence/continuous flowing of flakes in the upflow filter and to verify the influences of the execution of intermediate downflushes, with production of better quality effluents and longer filter runs. The upflow filter with filtration rate of 120 m3/m2.d. was able to attenuate the turbidity peak of 380 uT, producing prefiltered effluent with turbidity values between 0,3 and 5,7 uT, and the downflow filter, with filtration rate of 180 m3/m2.d. produced final effluent with consistently values lower than 1 uT and in most of time lower than 0,1 uT. (AU) | |