Biological Control - BAC VX Series Operation & Maintenance Manual

Biological Control

Bleed-off with or without chemical treatment for scale and corrosion
control is not adequate for control of biological contamination. The
growth of algae, slimes, and other micro-organisms, if unchecked,
will reduce system efficiency and may contribute to the growth of
potentially harmful micro-organisms, including Legionella, in the
recirculating water system.
Accordingly, a biocide treatment program specifically designed to
address biological control should be initiated when the system is first
filled with water and administered on a regular basis thereafter in
accordance with the supplier's instructions. Liquid biocides may be
added to the basin of the cooling tower in dilute form. If a solid form
of biocide is used, it should be added to the system via a pot feeder. If
ozone water treatment is used, ozone concentrations should not exceed
3-4 ppm in order to ensure maximum system equipment life.
For specific recommendations on biological control, consult a
competent water treatment supplier. All biological control treatments
must be carried out so as the installation meets the requirements of
AS-3666. Particular attention should be paid to;
1. Initial start up.
2. Shut down periods.
3. Start up after shut down periods.
Water Treatment
Bleed Off
Biological Control
NOTE: For specific recommendations
on all treatment for scale,
corrosion, and biological control,
consult a competent water
treatment supplier.
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