Estimativa da produção de biogás a partir da digestão anaeróbia do lodo gerado nas principais estações de tratamento de esgoto da região metropolitana de Aracaju

Abstract

The Basic Sanitation Law, which took effect 15 years ago, still does not fulfill its role of providing access to basic sanitation for the entire population. Currently, half of the sewage produced in Brazil is still not processed, as well as not all sewage collected is processed, negatively contributing to the human health and the environment, therefore, it is a profound faced challenge. Due to the increase in inappropriate waste water disposal linked to the need to reduce environmental impact, caused by the emission of gases that produces greenhouse effect on the atmosphere, motivates the search for sustainable energy sources that allow the existence of a lower impact on the atmosphere. As a way of potentializing the sustainable energetic management, world sanitation companies stive the utilization of renewable sources of energy, as for example biogas resulting of the sludge anaerobic digestion derived from sewage treatment plants (STP). The utilization of this biogas, rich in methane, offers significant benefits in many areas, environmental, economic, social and energetics, highlighting the importance of its utilization. In this context, the present paper’s purpose was to estimate the production of biogas generated by the sludge anaerobic digestion in six sewage treatment plants, they are: North ERQ, South ERQ, West ERQ, STP Barra dos Coqueiros, STP Rosa Elze and STP Orlando Dantas, located in the wide Aracaju. The methodology consisted on the self-monitoring data evaluation supplied by the Sanitation Company of Sergipe – DESO regarding the year of 2020. Therefore, on the basis of these data was estimated the biogas production, for each STP on the study. The found results confirmed the sludge’s energetic potential is bigger than the sewage’s, thus, there was a bigger biogas production coming from the sludge comparing with the sewage. Added the six STP’s production, there is a biogas’s output of 7.706,97m³/d. Accordingly, it is evident the importance of the biogas’s energetic utilization, providing the effluent’s reduction on the hydrous body, through the waste water treatment, causing a lower impact to the environment, generating clean and renewable energy.