Reduce Microbiological Growth Throughout the Cooling System
Part 3 of 3
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 DR890 Portable Colorimeter
Differential pH Digital Sensor
|Monitor disinfection control||84sc Free Chlorine (TFC) Analyzer with an sc1000 Controller.
9187sc Chlorine Dioxide Analyzer with an sc100 Controller.
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)