Caracterização dos efluentes tratados em estações compactas para reuso direto não potável urbano em Maceió

Abstract

The increasing demand for water and sewage launches is causing contamination and pollution of water bodies. The treated domestic sewage reuse minimizes the demand for potable water and contributes to the reduction of effluent discharge into bodies of water. The objective of this work is to characterize and fit the treated effluent from sewage treatment plants (ETEs), in the form of non - potable direct reuse for urban purposes. The efficiency of three compact type TEEs in the city of Maceió was evaluated by anaerobic, aerobic and mixed treatment, whose treated effluents were characterized and compared to the standards for the reuse modalities contained in Resolution 54/2005 of National Council of Water Resources (CNRH). The anaerobic treatment showed good BOD and COD removal of 71.54% and 72.34%, inefficient in the removal of nutrients and pathogens. The aerobic treatment showed low removal of BOD and COD of 67.37% and 66.72%, and inefficient removal of nutrients and pathogens. The mixed treatment had good removal of BOD and COD of 77.57% and 75.59%, there was no nutrient removal and good disinfection. The ETE A effluent, met requirements for reuse in the urban environment the parameters: total phosphorus and pH. The ETE B effluent met requirements for reuse in the urban environment parameters: total phosphorus, pH, nitrite and nitrate. The ETE C effluent met requirements for reuse in the urban environment parameters: total phosphorus, pH, nitrite, nitrate and fecal coliforms. In view of the results found in the three TEEs monitored, it is necessary to adopt post-treatment, observing the reuse in the urban environment, since these stations are not manufactured and optimized for reuse practice.