Influência de campo eletromagnético aplicado no biotratamento de efluente de cromo hexavalente

• Ano de defesa: 2012
• Autor(a) principal: Moura, Alex Anderson de Oliveira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Uberlândia; BR; Programa de Pós-graduação em Engenharia Química; Engenharias; UFU
• Palavras-chave em Português: Redução de cromo (VI); Campo magnético; Cultura mista; Reator batelada; Efluente contendo cromo; Cromo; Águas residuais - Purificação - Tratamento biológico; Reduction of chromium (VI); Magnetic field; The mixed culture batch reactor; The effluent containing chromium; CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA
• Link de acesso: https://repositorio.ufu.br/handle/123456789/15187; https://doi.org/10.14393/ufu.di.2012.324

This work was to study the influence of the magnetic field on the reduction of hexavalent chromium, removal of COD and total chromium, addition of cell growth in batch (batch reactor), using a mixed culture from located in a tanning city of Franca-SP (AMCOA). The influence of static magnetic field generated by a device that produces an electric current through a conductor, producing a magnetic field around the conductor, like a magnet. This equipment produces a magnetic field pulsed square wave of constant intensity and frequency. In the first step of adjusting the mixed cultures of chromium VI obtained a promising response. Thereafter, a preliminary test was performed to analyze the behavior of the influence of the magnetic field in the reduction of chromium VI and diameter of the reactor, obtaining 71% reduction of chromium VI with a larger diameter, without the presence of magnetic field has seen a reduction of 53%, with an initial concentration of 100 mg/l of chromium and a time of 4 hours of process. In other stages of the project, performing the tests with different frequencies of the magnetic field (1,2,5 and 10 Hz) and doing an analysis related to cell death of micro-organisms, showed that for frequencies of 10 Hz, there was cell death presents some cultures, which was confirmed in a lower frequency. The results were satisfactory when used in a magnetic field frequency of 5 Hz, maximal reduction of chromium VI reducing the time about 4 hours of processing, better removal of COD and total chromium using a volume of 500 ml and concentration of 100 mg/l initial chromium. Checking the influence of different frequency magnetic field, the initial effluent volumes (300 and 1000 ml) and initial concentration of chromium VI (50, 150 and 200 mg/l). The higher the initial concentration the lower the chromium reduction of chromium VI, larger volumes and a reduction of chromium VI and removal of COD and total chromium is not as significant as the use of smaller volumes.