Efficiency of prefabricated biodigesters in the treatment of domestic wastewater in dispersed rural localities

Abstract

In most developing nations, poor wastewater management continues to be a significant health and environmental concern. In this context, the research seeks to evaluate the efficiency of the biodigester treatment of domestic wastewater through monitoring and evaluation, based on physicochemical and bacterial parameters to reduce environmental pollution caused by excreta in the Chibaya Baja sector, Peru. Water sampling was done in the influent and effluent of the biodigester, taking samples periodically every 15 days, for 01 months, obtaining 03 samples for physicochemical and bacteriological analysis. According to the results obtained from the laboratory, the efficiency of the domestic wastewater treatment was 59.51% of the biochemical oxygen demand (BOD), 49.16% of the chemical oxygen demand (COD), in oils and fats 35.92%, in total suspended solids 52.78% and fecal coliforms (thermotolerant) 89.19%. A comparison of the parameters evaluated with the maximum permissible limits set by the Peruvian Ministry of the Environment reveals that the levels of BOD and COD exceed the limits. Therefore, this wastewater should not be discharged into water bodies.