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4.6 Recycled Water -- Achimota Brewery, Ghana
The process involves the use of recycled water to blend with
incoming cold water as feed water for boilers. Hot water obtained in the
process is used in the brewing process or as a boiler feed water and
filling pasteurizer. This technology is described in Part B, Chapter 3, "Mining
Extent of Use
This technology is used in the brewing and bottling industry in Ghana,
and specifically at the Achimota Brewery.
Operation and Maintenance
The regular maintenance of the mechanical systems is done by trained
artisans employed by the Brewery.
Level of Involvement
The level of involvement is primarily within each factory and is,
therefore, industry specific. Generally, the availability of trained
artisans is the principal requirement for implementing this technology.
Initial capital costs may be high if plant operations need to be
restructured and new equipment installed. However, these costs are usually
offset by the long-term savings in water costs. No information on
operating and maintenance costs is available, but the costs may be assumed
to be reasonably low and similar to the cost of using conventional
This technology is suitable in any industry that demands a large volume
of boiler water. The application used within the Brewery is similar to
that applied to thermal power generation cooling systems (described in
Part B, Chapter 3, "Mining and Industry").
Use of this technology , which can be easily integrated into the
industrial process, results in a significant savings in both water demand
and water costs in the industry. The technology also can be easily
modified to include other sources of blending water such as groundwater.
Use of this technology is limited in application to situations where
there are heat exchangers. Also, impurities within the blended water
stream may result in boiler scale.
Further Development of the Technology
This is a fairly old technology. Current research is focusing more on
improving the efficiency of the boilers rather than on the degree of
Achimota Brewery Limited, Achimota, Accra, Ghana.