Caracterização e alternativas para melhoria operacional da estação de tratamento de efluentes de uma indústria alimentícia

• Autor(a) principal: Landim, João Felipe Carvalho
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/3829
• topic: Águas residuais; Resíduos industriais; Efluentes; Anaeróbio; Salgadinho; Wastewater; Industrial waste; effluents; anaerobic; Snack; CNPQ::ENGENHARIAS::ENGENHARIA SANITARIA::SANEAMENTO AMBIENTAL

The Brazilian food industry has presented steady growth and development and is responsible for annual sales of over 350 billion reais. The wide range of food products includes snacks. The wide variety of products implies a variety of effluents of differing qualities. The objective of the present study was to operation of a snack factory wastewater treatment plant (WWTP) that receives two distinct flows, one sanitary and the other originating from weekly equipment cleaning, of a more industrial nature. Samples were collected at four points in the WWTP for physico-chemical and ecotoxicological evaluation. Studies were performed to determine effluent flow rates and their variation over one week[s production and the amount of sodium carbonate that would need to be used to neutralize the effluents at the entrance of the biological treatment, comprised of a septic tank and anaerobic filter. of efficiency in bench scale and characterization of industrial effluents. Laboratory studies were also carried to evaluate the potential for use of a commercial product containing fermentative bacteria for improving COD removal efficiencies. The results revealed the WWTP inefficiency and failure to meet state discharge limits for most parameters. The factory ́s effluents are acutely toxic and at the entrance of the septic tank they are acidic and lack sufficient nutrients to permit biological treatment. A COD removal efficiency of 58% and elimination of acute toxicity was achieved in a 96 hour anaerobic treatment of the sanitary wastewater in the laboratory. When the sanitary wastewater was mixed with the cleaning wastewater, COD removal was only 40% and toxicity was not eliminated. Addition of the commercial did not improve COD removal in either wastewater.