STUDY OF THE EFFECTS OF TEMPERATURE AND DILUTION OF PIG MANURE ON BIOGAS GENERATION

Abstract

The generation of biogas emerges as a technological and environmentally adequate alternative for the destination and energy use of waste from animal breeding. Since the contamination of the environment is increasing, due to the anthropization caused by humans and their impact generating activities. In this scenario, the contamination of rivers and watersheds that supply both rural and urban environments with animal waste refers to one of the main impacts from livestock production. Therefore, the aim of this work refers to the production of biogas through the anaerobic digestion process (DA) and the influence in relation to the production of methane (CH₄), which the variables temperature and dilution of the substrate, pig manure (DS), present on the DA. For this, different dilutions of DS in distilled water (1:0, 1:0,5, 1:1, 1:1,5 and 1:2) and temperatures (30 °C, 35 °C and 40 °C) were evaluated. Physical-chemical analyses were also performed to characterize the substrate, such as COD (chemical oxygen demand), ST (total solids), SV (volatile solids) and pH.For the determination of CH₄, the water displacement method was used. The results showed that the methane yield was the lowest at 30 °C and the different dilutions did not show great variation in production. On the other hand, at temperatures of 35 °C and 40 °C, the temperature 35 °C being the one with the highest production, the dilution was important for a better performance of methane production.