Avaliação do tratamento de esgoto sanitário combinado com resíduos sólidos de restaurantes em biodigestor chinês e reator UASB

Abstract

This work had the objectives of studying the sewage treatment through a Chinese-type digester (Stage 1) and a UASB reactor (Stage 2), besides the sewage treatment together with solid waste from restaurants through a USB reactor (Stage 3). The experiment was performed at Estação de Tratamento de Esgotos da UNISINOS (Universidade do Vale do Rio dos Sinos), where the systems were initially started (biodigester and reactor) through the use of UASB’s Iodine existing in ETE from UNISINOS as inoculum. Relating stages 1 and 2, the analysis of apparent color, true color and turbidity presented higher values in the reactor outlet analysis during stage 1. In stage 2, the apparent color and turbidity results presented a reduction of 41% and 77% respectively. The analysis of DBO presented a reduction of 32% between the inlet and outlet of the reactor in stage 2 against 17% in stage 1. In the DQO analysis, the considered mean of removal was 20% in stage 2 against 52% in stage 1, however the stage 2 latest reviews came to a reduction of 80% in the reactor outlet analysis. Relating stages 2 and 3, the color reviews (apparent and true), DBO and DQO presented higher values in the outlet due to the addition of RSR. Comparing to the stage in which no RSR was added (Stage 2), the parameters analyzed (except for pH and turbidity) presented higher after the addition of RSR. About the generation of biogas, the increase in biogas production after the waste addition has been proven, something that actually occurred mainly after the second waste addition, boosting an increase of approximately 80% in its generation, having, therefore, indicative of the possibility of combined treatment, in the same reactor, of sanitary sewage and solid waste from restaurants. The results suggest that the UASB reactor configuration (Stages 2 and 3) has a power of removal of organic matter higher than the Chinese-type digester configuration (Stage 1), which boosts studies with a longer period of operation with the introduction of RSR for a integrated treatment (ES and RSR) in UASB reactors.