Performance evaluation of Acoordome (near Sogakope) and Keseve (near Ada) water treatment plants in the South Tongu District of the Volta Region
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Date
2001-12-13
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Abstract
This document is the project report on the performance evaluation of the Agordorne and Keseve water treatment plants, as well as the comparison of the water from these plants with brands of bottled water namely, Voltic. Yes. Aquafill and Smile. The two plants which constitute the South Eastern Water Supply Project are to supply water to about 70 communities of about 120.000 people. The bigger plant situated at Agordome near Sogakope in the South Tongu district of the Volta Region has a design capacity of 350m3/h or 8400 m3/d. But it is presently doing an average of 2 100 m3/d. just about 25 % of the design capacity. The smaller plant at Keseve near Ada has a design capacity of 65m3/h or 1560 m3/d. But it is presently doing an average of 890 m3/d. about 57 % of the design capacity. The plants have similar designs the differences being in the sizes and the number of the various treatment units. Both plants have raw water sumps with submersible intake pumps single drop cascade aerators constant head rapid gravity sand filters, contact/balance tanks treated water vertical turbine pumps back wash! service water pumps and tanks, sampling pump, surge tanks, air blowers and laboratory equipment. Others include chemical solution tanks and dosing pumps for alum and lime and chlorine dosing equipment.
The Agordome plant has been found to produce final water of lower turbidity values (0.5 - 3.2 NTU) than the Keseve plant (0.3-7 NTU), and of lower colour values (<5 Hazen) than the Keseve plant (<5-30 Hazen) The average removal efficiency of turbidity at Agordorne (51 %) is higher than at Keseve (38.5 %). The Agordome plant produces water of lower cost per unit cubic meter sent out (¢266/m3), about half the cost at Keseve (¢502/m3). With respect to the percentage of water sent out to the raw water pumped, the Agordorne plant has a higher average value (95.6 %) than the Keseve plant, which has an average value of (91.2 %). The normal filtration rate at Agordome ranges from 1.18 to 3.55 m/h with a design rate of 5.47 m/h. That at Keseve ranges from 2.43 to 3.89 m/h with a design rate of 3.16 m/h. When one filter is taken out for washing, the rate at Agordome ranges fron 1 .58 to 4.73 m/h with a design rate of 7.29 m/h. That at Keseve ranges from 4.86 to 7.78 m/h with a design rate of 7.22 m/h. The final water from plants and the bottled water samples were all within the WHO and Ghana standards.
Description
A Thesis Submitted to the Board of Postgraduate Studies,
Kwame Nkrumah University of Science and Technology, Kumasi in partial fulfilment of the requirement for the award of the degree of Master of Science in Water Supply and Environmental Sanitation, 2001