Biofouling problem   
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. 

Biofouling test  
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. 

The solution
Aetech engineers have developed a new technology to reduce the costs from the environmental and economic point of view.