AVALIAÇÃO DA QUALIDADE DA ÁGUA DO CÓRREGO SAMPAIO EM PIRES DO RIO (GO) ANTES E APÓS O LANÇAMENTO DE EFLUENTES DE ABATEDOURO AVÍCOLA

Abstract

Industrial effluents have a high polluting potential and, if discharged indiscriminately into courses of water, can cause serious environmental damage. Thus, this study aimed to analyze the impacts caused by the discharge of the wastewater from a IETP from a slaughterhouse located in Pires do Rio - GO in a stretch of stream Sampaio, as well as to quantify the deoxygenation coefficient (K1) of the wastewater and then simulate the self-cleaning potential of the couse of water. The study was carried out by means of seasonal evaluation in two campaigns (dry and rainy period), simple point sampling of the effluent, as well as the course of water collected at two points (upstream and downstream of the industrial effluent discharge). The data obtained from the tests for determining WQI and TSI were submitted to qualitative analysis; the COB evaluation of the effluent by means of non-linear regression allowed to determine the K1experimental value of the final effluent; and the simulation of the self-purification of the course of water was evaluated by analyzing the COB curves and DO depletion. The K1 obtained for the final effluent was 0.098, showing previous degradation of the fraction of organic matter more easily assimilated. The indices (WQI and TSI) allowed us to state that the water in the study section is of a quality between GOOD and REGULAR. The river did not show a significant drop in quality after receiving the industrial effluent. In general, a course of water with low eutrophication potential was observed. The data allowed us to conclude that stream Sampaio suffers contamination prior to the release of industrial effluent. This fact is explained by the urban expansion that reached the areas close to its margins, helping to suppress riparian forest reserves, compromising the quality of the surface waters.