EXAMPLE OF CONSTRUCTION AND O&M
COSTS - CONTINUED
17 shows that the use of a 20% sidestream leads to a 50% chemical
cost saving of 2.63 c/kL (De Souza et al., 2002). In the case
of a 100 ML/day treatment plant, this is equivalent in a savings
of R 78,900 per month and R 959,950 per year (De Souza et al.,
2002). The treatment cost using conventional lime/CO2
shows a constant trend throughout the range of the percent sidestream.
Cost comparison also shows that it was financially attractive
to do the following:
a) Strip the excess CO2 after blending
the sidestream and mainstream.
b) Accompany the partial stripping of the mainstream by adding
lime.
c) Not strip the excess CO2 before blending
the sidestream and mainstream.
d) Not strip the CO2 from the mainstream.
Financial assessment was carried out to investigate the viability
of the Simplified SSP to stabilize the raw water of the Lesotho
Highlands Scheme, South Africa. Financial evaluation of SSP was
conducted by comparing its cost with the conventional methods
(lime and carbon dioxide stabilization) treating the raw water
from Katse Dam, South Africa. 
15 shows the raw water characteristics.
The viability of the SSP was assessed using the computer model
developed using JAVA and pilot plant operation.
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