Cooling towers provide an environment conducive to the buildup of microorganisms, which cause serious problems in the system through which the cooling water circulates. Among them are (a) buildup of odors and, slime, caused by an increased microorganism population, (b) loss of heat transfer, due to the low thermal conductivity of the, bio film and inorganic deposition (c) increased corrosion rates, due to electrochemical cell formation in the bio film and blocking of the contact of any corrosion inhibitor with the metal, (d) increased pumping energy required to circulate the cooling water in the presence of a bio film which has a high friction factor and (e) potential spread of aerosols containing pathogens such as Legionella.
Therefore, control of microorganism buildup in the tower is essential for efficient operation of the cooling loop. One of the most efficient biocides for microorganism control in cooling towers is chlorine dioxide. This is especially true since chromate treatment has been phased out and towers are being operated in the alkaline pH range. In the alkaline range chlorine is not a particularly effective biocide because of the poor dissociation to HOCl. One of the biggest issues facing tower operators is the possible public health risk caused by Legionella bacteria, which may grow in the warm water of cooling towers. Solution 3000 is an ideal biocide for Legionella control.