Aerobic Bacteria tend to attach themselves,
under favourable circumstances, to metal surfaces; when their biological
cycle is terminated, they leave a layer of organic matter which acts as
a substrate for further development of higher forms of organics life.
The consequence of such organic growth
is a drop in heat transfer coefficient, a local increase in corrosivity,
an increase in slime/ scale deposition.
To avoid biofouling, biocide treatments
are carried out on the incoming cooling water. The current practice is
to maintain a fixed concentration of biocide in the outgoing water thereby
producing sterilization of the water. As all biocide are strong oxidants,
an excess will increase the corrosivity of the cooling water while the
part that reacts with organic matter will provoke pollution.
Aetech engineers have developed a new
technology to reduce the costs
from the environmental and economic point of view.