Full text
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| Author(s): |
Valter Lúcio de Pádua
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) |
| Defense date: | 1999-06-25 |
| Examining board members: |
Luiz di Bernardo;
Ruben Bresaola Junior;
Carlos Gomes da Nave Mendes;
Jurandyr Povinelli;
Bernardo Arantes do Nascimento Teixeira
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| Advisor: | Luiz di Bernardo |
| Abstract | |
This work was carried out to study the potential use of non-woven synfhetic fabrics in flocculant supensions filtration of water treatment plants. The experimental investigation was performed in four steps: characterization ofphysical properties of Brazilian non-woven synthetic fabrics; tests in a bench-scale using artificial waters; tests in a pilot plant using natural water; study in water treatment plants. It was concluded fhat fhe use ofnon-woven synthetic fàbrics is a tecbiíque that must be considered as an altenative to minimize problems in water treatment plants caused by inapropriate functioning of sedimentation tanks. At the pilot plant, longer filter run times resulted with fhe use of non-woven fabrics placed atthe outlet ofthe sedimentation tank because ofthe lower rate ofpressure head loss development or due to retarding fhe filter breakthrough. Considering the turbidiy removal and the total headloss in the fabrics, the best one was that consisted of polyester fibres chemically bonded, 44 mm average thickness, 99,7% porosity, 4,7x102 m2. m-3 specific surface area, 25 m mean fibre diameter, and 180 g.m-2 (AU) | |