AVALIAÇÃO DO IMPACTO DO LANÇAMENTO DO EFLUENTE DE UMA ESTAÇÃO DE TRATAMENTO DE ESGOTO DOMÉSTICO NO RIO CUIÁ

Abstract

Water is one of the natural resources most used by man to supply metabolic needs and other purposes. However, only fresh water can be used to supply living organisms. This, in turn, is present in a smaller quantity on the earth, being 0.8% of the total available fraction being able to be used for public supply. Some economic activities require a larger quantity of water and therefore may overlap the supply. Besides the increase in the volume of sewage, directly affecting the effluent treatment plants. Or, sometimes, due to the lack of basic sanitation, affect water bodies that run through the urban perimeter, causing several inconveniences and directly affecting its quality. For this reason, sewage treatment plants play a key role by capturing and applying various treatments until the effluent reaches the standards imposed by resolution 430/2011. Guaranteeing the preponderant uses foreseen in the CONAMA resolution 357/2005, besides the environmental preservation. This work aims to evaluate the impact of the discharge of the effluent treated by the sewage treatment plant in the Cuiá River. Considering the degree of removal of feacal coliforms, BOD, QOD, total phosphorus, ammoniacal nitrogen, DO, pH, SS, ST, STF and STV carried out by the Australian model of the WWTP and to elaborate a general and current diagnosis on the quality of the Cuiá River. Collections were carried out at five sampling points: three at the ETE and two at the Cuiá River, over the years 2017 and 2018, in order to associate the results of the physical-chemical and microbiological analyzes with the purification of the river. The microbiological analysis showed that there is the presence of thermotolerant coliforms (TC) before and after the release of treated effluents, with higher values downstream in the months from July to December 2018. The physical-chemical analyzes showed that there is interference from the launch point of the domestic treatment of Mangabeira (ETE-Mangabeira). It is hoped that these results may contribute to the performance of the public power in the face of threats to the degradation of this water body.