Avaliação da qualidade da água consumida em função da sazonalidade da chuva e os impactos ambientais no sistema de abastecimento público

Abstract

For public supply of Alagoas, CASAL (Sanitation Company of Alagoas) - Eastern Business Unit uses different types of ecosystems to capture water with different operating mechanisms, especially surface and groundwater sources (wells). The study aims to evaluate the quality of drinking water due to the seasonality of rainfall and environmental impacts on water supply systems were evaluated in the supply systems of the cities of Colonia de Leopoldina, Matrix Camaragibe, Pilar, Porto de Pedras and Rio Largo. To assess the current quality of the systems were analyzed for physical, chemical and bacteriological, representative of drinking water in treated water samples of the years 2008 and 2009, verifying the compliance with the standards of Ordinance No. 518/2004 of the Ministry of Health . For characterization of human impacts on water sources (surface or underground) at points of capture were used arrays of impacts. With their monthly data from the meteorological station of SEMARH-AL, precipitation (mm) were used in comparisons between consumption and water quality index (data provided) to verify the periods behave according to the weather and climate (considering the two stations defined for the regions, namely: rainy and dry season). According to the results, the analysis of human impacts on watershed study showed that rates were higher than 0.7 or 70% demonstrating good environmental conditions, and the uptake of Pillar reached a level close to excellent environmental quality. With regard to seasonality, water consumption had better quality in the dry season, the rainy season IFQDP parameters (physico-chemical indices) had a low that usually goes from March to August of each year, but that in the rainy season ratio was gradually adjusted to the required dosage of coagulant (alum). Since the parameters IBDP (bacteriological index) did not influence the rainy season. But the cities studied have reached a good level of water quality getting achieve the standards required by Ordinance 518/2004 of the Ministry of Health, which demonstrates the efficiency of treatment processes of a Water Treatment Plant