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W W W . B A L T I M O R E A I R C O I L . C O M . A U
M A R 2 1 0 - 2
The use of water reclaimed from another process as a source of
makeup water for evaporative cooling equipment can be considered
as long as the resultant recirculating water chemistry conforms to the
parameters noted in Table 2 on page 24. It should be noted that using
water reclaimed form other processes may increase the potential of
corrosion, microbiological fouling, or scale formation. Gray water or
reclaimed water should be avoided unless all the associated risks are
understood and documented as part of the site specic treatment plan.
Gray Water and Reclaimed Water
Corrosion Protection
Corrosion and Scale Control
Biological Control
Gray Water and Reclaimed Water
Biological Control
• The warm, oxygen and nutrient rich environment inside evaporative
cooling equipment provides an ideal environment conducive to the
growth of algae, slime, and other micro-organisms. Uncontrolled, this
can reduce heat transfer, promote corrosion, and promote the growth
of potentially harmful organisms such as Legionella.
• To avoid biological contamination and minimize the risk of
Legionella, initiate the biocide treatment program at start-up and
continue on a regular basis thereafter in accordance with the
treatment supplier’s instructions.
• Bleed/blowdown or chemical treatment used for corrosion and scale
control alone is not adequate for control of biological contamination.
• Introduce solid or granular biocides through a chemical “pot” feeder
installed in parallel with the system circulating pump. Diluted liquid
biocides may be added directly to the cold water basin.
• If ozone water treatment is used, at no point should concentrations
exceed 0.5 ppm to avoid corrosion.
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