Potencial de geração de energia de duas cidades do sertão alagoano a partir do biogás proveniente da digestão anaeróbia de esgoto doméstico de estação de tratamento

Abstract

This study aimed to estimate the potential of electricity generation from biogas generation from anaerobic digestion of domestic sewage from the Santana do Ipanema STS, located in the city of Santana do Ipanema-AL, and from the Xingo, located in the city of Piranhas-AL. The estimation of biogas was made using data provided by the Alagoas Sanitation Company of BOD concentration and population served for each STS, using theoretical formulas to determine the monthly flow of biogas and methane from the In both systems, the useful electricity generation was calculated using the program "Biogas, generation and energy use - Effluents 1.0". With an average BOD concentration of 292.84 mgO2/L and a calculated flow rate of 7.39 L/s, an estimated biogas generation of 17.95 m3/day, was obtained for the Santana do Ipanema STS an estimated methane generation of 328.43 m3/month and the estimated useful power generation was 931 kWh/month; already the Xingo STS with a calculated flow rate equal to 12.59 L/s and an average BOD concentration equal to 376.67 mgO2/L an estimated biogas generation of 41.79 m3/day was obtained. , an estimated methane generation of 764.7 m3/month and an estimated useful energy generation of 2,165 kWh/month. The data generated are indicative of the possibility of installing a system for the collection and generation of energy, such as two STS produced by one generation of electricity per volume of biogas.