Estudo do impacto da variação dos parâmetros no cálculo final do índice de qualidade da água (IQA) como critério de classificação dos corpos hídricos superficiais

Abstract

Water is an essential ingredient for life, and so from the 1960 society demands solutions to mitigate deterioration of water quality. Since then, it began monitoring water quality. This monitoring is performed through indexes that have been and are being developed or improved in order to synthesize all the features of these substances in the water of a fountain on a single number. The quality index of more water used worldwide is the WQI, which was developed in 1970 by the National Sanitation Foundation (NSF) and was later adapted by the Environmental Sanitation Technology (CETESB) for use in Brazil. In 2005 the Institute of Minas Water Management (IGAM) developed a program to determine the WQI, called the Water Quality Calculation system (SCQA), and limited the qualities of tracks at different intervals of the adopted by CETESB. Thus, in order to facilitate decision making for the management of water quality of a spring it was developed in this study a program in Matlab platform that determines the value of the WQI methodologies CETESB and IGAM/SCQA and performs simulations to predict the parameters that must be controlled to maintain the current water quality and that should be worked (high or low) to obtain the desired value of the WQI in spring. The program also examines whether the parameter values are within the freshwater classification ranges according to CONAMA Resolution Nº 357/2005. For simulation were mounted three scenarios, the first belonged to the WQI of poor quality range in the second, the WQI belonged to reasonable quality range, according to the calculation methodology of IGAM/SCQA, and good quality range, according to CETESB calculation methodology, and the third scenario, the WQI belonged to optimum quality quality range. The program presented the parameters that should be worked to obtain different values of WQI