Abstract

CENTENO CALDERON, Luis Gabriel; QUINTANA DIAZ, Aníbal  and  LOPEZ FUENTES, Fiorella Lisset. Effect of a microbial consortium on the effectiveness of wastewater treatment, Trujillo, Peru. Arnaldoa [online]. 2019, vol.26, n.1, pp.433-446. ISSN 1815-8242.  http://dx.doi.org/10.22497/arnaldoa.261.26123.

The technology of the EM product (efficient microorganisms) has been reported as an alternative for the treatment of sewage, since it increases the densities of microorganisms that can use the compounds present in water as a source of carbon and energy for their metabolism and growth. This work was carried out with the objective of evaluating the best treatment of a consortium of microorganisms composed of Lactobacillus sp., Schizosaccharomyces pombe and non-sulphurous red bacteria in the treatment of wastewater. To do this, we worked with three treatments (3 x 108, 9 x 108 and 1.8 x 109 CFU/ml) and a control without consortium; the inoculum was prepared with 5 % of the consortium of microorganisms, 5 % of molasses and 90 % of sterile distilled water. To evaluate the best treatment, the biochemical oxygen demand test was used. In the first treatment, a concentration of 3 x 108 CFU/ml was used, decreasing to 199.1 mgO /L. In the second treatment, a concentration of 9 x 108 CFU/ml was used, decreasing to 142.9 mgO /L. In the third treatment, a concentration of 1.8 x 109 CFU/ml was used, being the most effective of all, decreasing to 132.1 mgO /L in relation to the control (247.2 mgO2/L). These results show a significant difference between them, with a value p < 0.05. Therefore, it was possible to conclude in this investigation that the best treatment to reduce the biochemical oxygen demand in wastewater was treatment 3 corresponding to the concentration of 1.8 x 109 CFU/ml of the active consortium.

Keywords : consortium of microorganisms; wastewater; biochemical oxygen demand.

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