Reduce Microbiological Growth Throughout the Cooling System 

Part 3 of 3

9184sc Total Free Chlorine Amperometric Sensor

The warm temperatures, nutrients from solids, moisture, and darkness of a cooling water system create an ideal environment for biological growth. Inadequate disinfection also contributes to this problem, resulting in increased algae, bacteria, mold, fungi, and yeasts. Biological growth causes fouling, corrosion, reduced heat transfer, and hazardous operating conditions. Workers inside the tower and anyone breathing external vapor drift risk exposure to Legionella, Aeromonas hydrophila and other microbiological agents, which may potentially develop into life-threatening illnesses.

Optimized use of oxidizing and/or non-oxidizing biocides along with related on-line, field, and lab analysis helps reduce biogrowth. Oxidizing biocides typically involve chlorine, sodium hypochlorite, bromine, sodium hypobromite, ozone, chlorine dioxide or even blends of these compounds. Corresponding on-line analysis monitors for specific oxidizers or for a mixture with a known calibrated standard. Overuse of chlorine and other oxidants, however, may cause enzyme leaching (lignin) from wood fill and additional corrosion.

Non-oxidizing biocides such as quaternary ammonium compounds (polyquat) and isothiazolinones also kill most bacteria. However, on-line control for this type of biocide is not simple. Some chemical manufacturers add a tracer of fluorescent compound or molybdenum to gauge the presences of the non-oxidizing biocide in the system. Excessive non-oxidizing biocides may produce foaming problems with a consequent need for anti-foamers.

For additional disinfection related products, refer to our Disinfection Application Guide.

Test oxidizing disinfection and monitor biological kill rate.Combine ORP with oxidant analyzer on-line for comprehensive control. Portable Pocket Colorimeter II (Free & Total Chlorine) and DR900 Portable Colorimeter
Differential pH Digital Sensor
Monitor disinfection control 9184sc Free Chlorine Analyzer
9187sc Chlorine Dioxide Analyzer
CL 17 Free Residual Chlorine Analyzer
Monitor tracers MO42 Molybdate Analyzer
CLF10 sc Free Chlorine Sensor
Verify pH and conductivity in the field Portable HQ30d Single-Input Multi-Parameter Meter or HQ40d Dual-Input Multi-parameter Meter (with conductivity or pH)
Verify multiple laboratory parameters CEL/890 Professional Water Treatment Laboratory
Test for biological activity BART™ (Biological Activity Reaction Test)
Paddle Testers