Avaliação e dimensionamento da estação de tratamento de esgoto de Rio Paranaíba - MG

Abstract

According to the Municipal Plan for Basic Sanitation in Rio Paranaíba - MG, the municipal sewage system has seven collective pits and a sewage treatment plant (STP). There are no official data for the sewage collection index in the city or for the efficiency of treatments. Considering that the existing STP doesn’t support the city's demand, the proposed study is based on its analysis and the design of a new STP, presenting alternatives for the reuse of the by-products generated in the treatment. It was found that the STP is with damaged structures and outside the current rules for project design. The design of the dimensioned new system comprises the preliminary treatment, containing railing, sandbox and flow meter. The upstream flow anaerobic reactor is responsible for carrying out the secondary treatment followed by polishing ponds, for the post-treatment of the effluent. The system also has sludge drying beds for the dehydration of the digested sludge in the anaerobic upflow reactor. The new sewage treatment plant will be able to serve the city by 2040. To assess its performance, it is important to make sure that the legal and regulatory requirements in force are being respected through analyzes of the quality parameters of the treated effluent, the dewatered sludge and the entire operation that takes place at the sewage treatment plant.