Efficiency of water treatment by Ghana Water Company Limited in Daboase at Wassa East District

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Water is one of the most important resources man needs. The study was conducted to determine the efficiency of water treatment at Daboase headworks of Ghana Water Company Limited in the Mpohor Wassa East of the Western region. To achieve higher treatment efficiency of contaminants, the GWCL plant uses procedures which include flocculation/coagulation, sedimentation, filtration and disinfection. Physico-chemical and bacteriological water quality analyses were conducted on eighty (80) samples for both the raw and treated water from January 2012 to May, 2012. The results indicated that the raw water contain high mean values of 1364.77 ± 326.99 Hu, 1107.05 ± 103.70 NTU, 14.38 ± 3.4 MPN/100ml and 1.91 ± 1.76 CFU/100ml for colour, turbidity, total coliforms and E. coli respectively which exceeded the WHO standard limits making it unsafe for drinking. The treated water samples had mean values of 6.92 ± 0.11, 5.59 Hu, 2.70 ± 0.30 NTU, 76.05 ± 4.26mg/L, 0.76 ± 0.26 mg/L, 49.41 ± 3.67 mg/L, 0.10 ± 0.03 mg/L, 0.85 ± 0.12 mg/L, 0.0 MPN/100ml and 0.0 CFU/100ml for pH, colour, turbidity, total hardness, nitrate, sulphate, total irons, residual chlorine, total coliforms and E. coli respectively which were within the limits set by the WHO guidelines for drinking water. The results also indicated efficiency of 99.5%, 99.7%, 95.6%, 99.2%, 100% and 100% for colour, turbidity, nitrate, total iron, total coliforms and E. coli respectively. The overall efficiency of the treatment plant was 99.0% which makes the GWCL water treatment plant generally satisfactory during the period of this study.  
A thesis submitted to the Department of Theoretical and Applied Biology, Kwame Nkrumah University of Science and Technology in partial fulfillment of the requirements for the degree of Masters of Science in Environmental Science,