Evaluación de microorganismos eficientes para la remoción de ácido sulfhídrico sobre lodos activados en aguas residuales de la industria procesadora de alimentos La Ibérica.

Abstract

The objective was to evaluate microorganisms for the removal of H2S on activated sludge in the wastewater of the food processing industry La Ibérica. For the experimental part of the research, it was constructed a biofilter with efficient microorganisms, activated sludge, obtained after a 7 days activation process and parameters such as pH, temperature, humidity, oxygen and sunlight were monitored in the analysis unit to ensure suitable the product efficient microorganisms (EM) activated. Regarding the residual water to be used in the investigation, its sampling was carried out in the review box closest to the point of discharge to the sewage system of La Ibérica and for its analysis at the exit of the biofilter, taking a sample with three repetitions each week, during 21 days, to know the initial, intermediate and final concentration of H2S and its percentage of removal reached before the treatment with efficient microorganisms. The results of the investigation showed that efficient microorganisms increased the microbial load of the native microorganisms in the sludge, obtaining a better growth of the biofilm and favoring the reproduction of sulfo-reducing bacteria, responsible for the removal of H2S, in the industrial wastewater, achieving better results in the third week of treatment, reducing the H2S concentration from 3.68 mg/L to 0.45 mg/L, achieving a percentage of removal of 70.35%. Concluding that greater retention times contribute to a better performance of efficient microorganisms in the treatment. It is advisable to use hydraulic retention times at least 5 hours and a maximum of 12 hours, so that the microorganisms present in the biofilter increase their performance capacity and there are more favorable results.