Avaliação do desempenho de uma ETE por lodos ativados tratando osefluentes sanitários da Mina Cauê - Itabira - MG

Abstract

This paper reports the results obtained by monitoring the quality of wastewater after treatment in a plant which uses the Activated Sludge process, operating under intermittent loading. The treatment system is located in Mina Cauê, Itabira in the city of Minas Gerais, and treats wastewater from the industrial and administrative areas of the iron mining large. The ETE Cauê had its start up in March 2011, replacing the old systems of treatment per septic tanks/anaerobic filters that were undersized and inefficient. This plant has the capacity to treat 5 L/s of sewage, of which currently about 1 L/s are being treated during the initial operational period. The analyzes carried out weekly, encompassed the months of March, 2011 to January 2012, demonstrated an averageefficiency of removal of COD and BOD of 81,1% and 81,7% respectively. The effluent of the Cauê WWTP complied in 96% of the results with the discharge standards set out in environmental legislation, CONAMA Resolution 430/2011 - the federal - and Joint Normative DeliberationCOPAM / CERH 01/2008 - the state - for parameters that show the removal of organic matter - BOD and COD. The treatment of sewage sludge by the process of Intermittent Flow Activated Sludge proved to be very effective as described in the literature.