Avaliação da qualidade da água para o consumo humano na região da bacia do rio Infulene

Abstract

The Infulene River basin is characterised by informal settlements with poor sanitation sanitation systems and intermittent water supply. Intermittency produces adverse effects, such as infiltration of contaminants into the water distribution network at times of times of low pressure in the pipes, especially during the rainy season. Furthermore during this season, surface water runoff facilitates the spread of contaminants in the water, thus decreasing its quality. Under these conditions, the contamination of water is imminent and information on the quality of water used for human consumption human consumption is limited at Infulene River basin level, and to overcome this gap, this study on water quality in the Infulene River basin was carried out. The work was based on literature review, field work and data analysis data analysis based on statistical tools and spatial analysis with the help of QGiS. Three types of water supply systems were identified, present in all the 58 neighbourhoods of the basin. The parameters analysed were temperature, pH, electrical conductivity total dissolved solids, dissolved oxygen, turbidity, total coliforms and E.coli. E.coli. A total of 59 samples were collected and analysed (n=27) mains, (n=28) boreholes and (n=4) wells, where the results observed were 7.9 for pH, 0.42 for turbidity, 679.4 for electrical conductivity, 413.5 for total solids, 25.4 for temperature, 5.73 for dissolved oxygen, 439.7 for TC and 19.03 for EC. According to Decree no. 180 of 15th September of the Ministry of Health the microbiological results results exceed the admissible limits for water for human consumption mainly from alternative alternative supply systems. In this sense, for the improvement of the quality of water quality of the aquifer, community awareness raising was recommended, as well as chlorination of the water in storage tanks to prevent contamination along the distribution system. contamination along the distribution system.