Chemical and bacteriological assessment of piped and borehole water in Des salaam city, Tanzania

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Kampala International University, School of Engineering and Applied Science
This study was undertaken to determine the quality of water by determining the e physicochemical parameters, chemical parameters and bacteriological properties of piped water, and boreholes water in Dar es Salaam city, as well as determination of the seasonal variation of raw water quality. Piped water samples were purposively collected at the point of treatment to the point of use. However all the operational boreholes water samples were sampled. Chlorine, conductivity, temperature, pH and Total dissolved solids were analyzed direct from the sites while Colour, Turbidity, Alkalinity, Total hardness, Alminium, Iron, Manganese, Ammonia, Nitrates, Chlorides, Calcium, Total coliforms and Faecal coliforms were analyzed in the laboratory following the standard procedures for water analysis. The results showed that, piped water was of better quality compared to that of the borehole as most of the values analyzed were within the maximum permissible limit according to WHO (2008) and current Tanzanian standards. The major contaminants in underground water were calcium derived geochemically, faecal coliforms and total coliform attributed to anthropogenic activities. Values for conductivity were much high for the borehole samples, with the highest mean value of (1241.5±1086.98) ps/cm recorded at Mzimuni Primary School while for the piped was (I52.35±48.65)ps/cm recorded at Upper Ruvu plant. The low values from the piped water were due to efficient water treatment process done by DAWASCO. The chemical elements analyzed in piped water, were all below the permissible limit except aluminium which had the highest mean value of (I.43±1.17)mg/l at House hold 1 which was above 1.0mg/I of that of Tanzanian standard maximum permissible limit of drinking water whereas those obtained from the borehole, were within the permissible limit. The highest mean value for total coliform was 3.66±0.58/lOQml from the piped water at City Botanical Garden and 3.33±2.08/100m for House hold 3, and 3±1/lOOmI, from the boreholes at Shauri Moyo. The highest value for faecal
A thesis submitted to the school of post graduate studies in partial fulfilment of the requirement for the award of the degree of Master of Science in environmental management and development of Kampala International University
Piped and borehole water, Chemical and bacteriological