Avaliação do uso de célula a combustível microbiana equipada com membrana de látex para o tratamento de águas residuárias provenientes do processamento da mandioca
Keywords:
Energia renovável, Célula a combustível microbiana, Membrana troca iônica, Látex, Águas residuárias do processamento da mandiocaAbstract
The use of microbial fuel cells (MFC) has been the subject of great interest in wastewater treatment. However, the high cost of the materials used, especially the commercial ion exchange membranes, has been a significant obstacle to the commercial scale expansion of this technology. In this context, the present study aimed to evaluate the application of a MFC equipped with a latex membrane in the treatment of cassava mill wastewater. For this purpose, two double-chamber MFCs were built, one equipped with a cation exchange membrane (MFC1), used as a control, and the other with a latex membrane (MFC2). In order to analyze the performance of the system, the generation of voltage and electric current was continuously monitored and, at the end of the operation period, polarization and power curves were obtained for a more detailed characterization of the systems. Additionally, monitoring of pH and reduction in chemical oxygen demand (COD) was carried out. Based on the results obtained, it was found that the MFCs presented different performances with regard to the generation of electrical voltage over the days of operation, with the MFC2 presenting inferior performance in relation to the MFC1. During the operating period, MFC1 and MFC2 showed a maximum electrical voltage of 0.588 and 0.330 V and a corresponding current output of 5.88x10-4 and 3.2x10-4 A, respectively. The power curve indicated maximum power densities of 6.67 W m-3 and 0.49 W m-3 for MFC1 and MFC2, respectively. As for the reduction of COD, the MFCs showed limited efficiency, with a reduction close to 50%. Regarding the pH, the values observed in the anodic chamber were considered ideal for the operation of the systems, with values. Furthermore, MFC2 presented a slightly superior result in relation to the gradient formed between the two chambers.Downloads
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