Avaliação da qualidade de água dos poços na cidade de Quelimane - estudo de caso dos bairros Elalane, Icidua e Micajune, província da Zambézia

Abstract

present study had as general objective to evaluate the water quality of the wells in the Micajune, Icidua and Elalane districts. The methodology consisted of analyzing the physical-chemical parameters: Ph, Turbidity, Conductivity, salinity, well water temperature considering the accepted legal standards for potable water for human consumption, based on Annex I of Law 16/91, Republic (2004), which establishes potability for public supply. For this purpose, water quality analyzes were carried out in nine wells in the three distinct districts. The physical-chemical parameters analyzed were compared with those predicted in the legislation, such as turgidity, pH, conductivity, total solids and temperature, complemented by total coliform microbiological and Escherichia coli. The results indicated that the turbidity was above the maximum allowed value in two wells 2 with a value of 6.96 and in well 2 with a value of 5.67 and the other wells were in compliance, the conductivity was in the maximum allowed value except in well 3 that was above of maximum allowed limit value of 2024 us / cm, while the pH was below the allowed maximum limit in the well 2 with value of 5.5 considered acid and the other wells were with pH 7 that was classified like own neutral for consumption. Total coliforms and 1. coli were recorded in all studied districts. Compared to what is established in Annex I of Law 16/91, Boletim da República (2004), water for human consumption must present a total absence of E.coli. It was confirmed the situation of the place where the water consumed in the homes presented a high risk of microbiological contamination. It is recommended to guide the populations in the districts that before consumption of this well water that boil the water or disinfection through chlorine to eliminate the bacteria.