Análise da eficiência do tratamento de efluentes em reatores UASB em Fortaleza/CE

The city of Fortaleza-CE is serviced by many wastewater treatment plants. These plants present operational problems that represent pollution risks to water bodies, therefore, needing a constant inspection to evaluate compliance with environmental legislation. Efficiency and compliance with environmental legislation were evaluated of 19 plants that operate with UASB technology. For that, 1770 monthly quality data were analyzed, obtained from the responsible concessionaire, for the period from January 2013 to July 2015. The following parameters were analyzed: Chemical Oxygen Demand (affluent and effluent), Total Suspended Solids (effluent), pH (effluent) and E. coli (effluent). It was observed that compliance with environmental legislation is deficient, with the following percentages of samples within the standards: 21% for COD, 11% for SST, 100% for pH and 52% for E. coli. Finally, improvements were suggested to be implemented by the concessionaire.