Reduce Fouling Throughout the Cooling System 

Part 2 of 3

DR/890

Inadequate control of suspended solids such as sand, silt, pollen, algae, slime mold, and other bio-growth causes fouling. In addition to presenting a biological hazard, fouling may cause plugging of:

  • Cooling tower fill (reduces surface area and consequently heat transfer)
  • Nozzles (impedes entry of hot water for cooling)
  • Drift eliminators
  • Condenser tubes

Fouling deposits on metal surfaces create sites for under-deposit corrosion. If heavy build-up results, the cooling system will require the inconvenience and expense of an off-line cleaning.

To reduce fouling throughout the makeup water treatment, keep tabs on the clarifiers and/or side-stream filtration. Clarifiers that utilize a combination of coagulation chemistry and settling should be optimized for coagulant use and solids carryover. Filters also need to be monitored for breakthrough or plugging.

Utilize adequate disinfection and pH control to prevent biological growth fouling. On-line instrumentation also helps control Total Suspended Solids (TSS) at makeup and in disinfection at the basin.


Additional parameters to measure in the prevention of fouling include:
Monitor to help prevent biological growth fouling Differential pH Digital Sensor
Control micro-caused fouling, depending on the solids level CL17 Chlorine Analyzer
CLF10 sc Free Chlorine Sensor
Regulate blowdown Digital Inductive Conductivity Sensor with gateway and sc200 or sc1000
Manage disinfection control Differential ORP Digital Sensor
Detect Total Suspended Solids (TSS). Also indicate breakthroughs of filtration systems. TSS sc Suspended Solids Sensor
SOLITAX sc Suspended Solids and Turbidity Analyzer
Verify on-line pH and conductivity instruments
of cycles
Portable HQ30d Single-Input Multi-Parameter Meter or HQ40d Dual-Input Multi-parameter Meter (with conductivity or pH)
Analyze concentration of oxidizing and non-oxidizing biocides DR890 Portable Colorimeter
CEL/890 Professional Water Treatment Laboratory
Determine turbidity of makeup water 2100Q Portable Turbidimeter
2100N Laboratory Turbidimeter
Test for microbiological organisms directly, including sulfate reducing bacteria (SRB) BART™ (Biological Activity Reaction Test)
Verifies disinfection control Pocket Colorimeter II (Free and Total Chlorine)