Tratamento físico-químico por flotação FAD de efluente laboratorial
The liquid effluents generated in the industrial activities present in its constitution elements that, if not removed, can cause contamination and damages in the environment where they are launched. Several forms are employed for the treatment of these effluents, among which dissolved air flotation...
| Autor principal: | Petry, Jean Carlos |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/12574 |
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| Resumo: |
The liquid effluents generated in the industrial activities present in its constitution elements that, if not removed, can cause contamination and damages in the environment where they are launched. Several forms are employed for the treatment of these effluents, among which dissolved air flotation preceded by coagulation and flocculation, in order to remove suspended solids and colloidal material. The aim of this work was to study the coagulation associated with flotation in turbidity removal, as a form of treatment of effluent from a central laboratory of physical-chemical, serological and microbiological analyzes. The use of three different types of coagulants, each associated to a flocculant, was analyzed and three different treatments were used. The objective was to find the optimization conditions and obtain a model of turbidity removal. For the tests, bench-scale laboratory equipment was used in order to find the dosages of coagulants and flocculants, as well as the pH of the coagulation, which would best favor the efficiency of the coagulation / flocculation / flotation treatment. Preliminary trials and an initial factorial planning 2³ were performed, with three factors: coagulant concentration, flocculant concentration and pH of the effluent. This planning was done in order to support the Central Rotational Composite Design (DCCR), performed with the same three factors. As results of the three treatments, it was verified that the treatment with Aluminum Polychloride and Cationic Polymer, as well as the treatment with Novfloc and Polfloc presented satisfactory averages in turbidity removal (69.94% and 65.54%, respectively) while the treatment with Aluminum Sulfate and Anionic Polymer obtained an average efficiency of 40.76%. From the tests, performed by the DCCR methodology, surface graphs were obtained showing the optimization regions, as well as three statistically valid mathematical models for the turbidity removal. It was demonstrated with this work the possibility of using flotation for the treatment of laboratory effluent, as well as the technical and environmental feasibility of using the Novfloc organic coagulant and the Polfloc organic polymer. |
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