Recuperação de biomassa bacteriana produzida no tratamento de efluente industrial

• Autor(a) principal: Lima, Leandro Kanamaru Franco de
• Data de Publicação: 2011
• Outros Autores: Ponsano, Elisa Helena Giglio [UNESP], Pinto, Marcos Franke [UNESP]
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.18539/CAST.V17I4.2081; http://hdl.handle.net/11449/133025
• topic: Biotechnology; Cell mass; Chemical oxygen demand; Colorimetry; Biotecnologia; Massa celular; Demanda química de oxigênio; Colorimetria

Recently, there has been an increasing search for alternative ways to treat industrial wastewater. The cultivation of phototrophic microorganisms in those effluents represents an attractive biotechnological alternative because it reduces the pollutant load and provides a useful biomass. However, for the removal of the cell mass provided by the process, it is necessary to use specific technologies. In this work, Rubrivivax gelatinosus was cultivated in wastewaters from fish slaughter and processing and the biomass was recuperated by two distinct methods, with the aim of comparing their productivities. Additionally, pollutant load decrease from both processes was evaluated and the colors of biomasses were compared to a commercial product. Cultivation was carried out under anaerobiosis, 30 ± 5ºC and 2,000 ± 500 lux, during 10 days, and the biomass recuperation was performed by process A (centrifugation) and process B (cross-flow microfiltration). Results showed productivity of 0.043 g biomass L-1 day-1 for process A, with a COD decrease of 52.51%. For process B, productivity was 0.079 g biomass L-1 day-1, with 81.25% COD reduction. The biomasses and the commercial product had similar lightness and hue. However, there was a difference in color saturation between the product from microfiltration and the commercial pigment. This work concluded that cross-flow microfiltration was the best method for obtaining Rubrivivax gelatinosus biomass, providing the higher decrease of organic matter in the industrial effluent.