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Rethink Cooling Tower Water Treatment

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Over the years Cooling Tower treatment involves heavy use of chemicals. Unfortunately these chemicals are not only costly, but also adds minerals in the water. This reduces Cycles Of Concentration [COC] & as a result in high blow down & more make up water demand. Using ozone operating cost is drastically reduced & blow down water quantity also reduces.

Published in: Technology

Rethink Cooling Tower Water Treatment

  1. 1. Rethink Cooling Towers Side Stream Filtration & Ozonation
  2. 2. Typical Cooling Towers • Cooling Tower Capacities • Flow rates • TSS • Microbiological load • Fouling • 500 TR – 5,000 TR • 500 – 5,000 m³/hr • 30 – 50 ppm • 10 – 10 MPN • Slime 62
  3. 3. Concern areas • Environment pollution - dirt (TSS) • Slime formation • Scaling • Corrosion • High dissolved solids - TDS • Microbiological growth • Formation of organic impurities • Frequent blow down • Efficiency
  4. 4. Requirement Customiz ation Optimiz ation Integrat ion
  5. 5. Solution • Main stream or side stream filtration • Optimized diffusion of Ozone
  6. 6. Solution - Filtration • Side stream filtration of 8 – 12 % of mainstream flow • Automatic Self cleaning filter • Pressure Sand Filter
  7. 7. Advantages - PSF • Worldwide proven technology • Depth Filtration • Excellent for fine silt • Online • Very low waste water • Long life • Negligible maintenance
  8. 8. Ozone Generation Oxygen Preparation Ozone Generation Ozone Injection Ozone Diffusion Ozone Contactor
  9. 9. Oxygen Preparation • Oxygen From Ambient Air • Oxygen concentrator • More than 90% concentration • Dry Industrial Grade Oxygen
  10. 10. Ozone Generator • High voltage, High frequency Generator • SS 316 Grade Ozone Cell • High Efficient Enameled Cell • Ozone Cell safety circuits • Dual Electrode Water Cooled Ozone Cell • Ozone under –ve Pressure
  11. 11. Ozone Injection & Diffusion • Venturi Ejector • Sparger • Chemone Diffuser cum Contactor • Valves, pumps etc • Water Trap • Ozone Vent
  12. 12. Advantages - ozonation • Considerable reduction in the use of chemicals except for pH balancing • Greatly reduces Blowdown • Ends discharge liabilities and chemical storage record keeping • Destroys all types of microorganisms instantly • Minimizes condenser fouling • decomposes organic waste by oxidation
  13. 13. Cont.... • removes existing calcium carbonate scale by destroying the biomass glue bonding agent • the most environmentally friendly oxidant • reduces the corrosion rate of metals, including copper heat exchangers • saves on energy costs by increasing the heat transfer efficiency of the chiller
  14. 14. Reduction of Operating Costs • Ozone reduces makeup water to the cooling tower by permitting more cycles between blow downs. • Reduces the cost and problems in ordering, shipping, handling, storage, and disposal of regular chemicals. • Reduces power consumption by keeping the chiller heat transfer efficiency high through cleaner condenser tubes.
  15. 15. Client : CIPLA Application : Cooling Tower WTP Present Cost Expected Savings In ChemicalsSite : Goa CT Capacity : 600 TR x 06 nos. Chemicals Application Quantity Rate/Kg Cost/Month Savings Quantity Cost/Month Kg/Month INR INR In % Kg/Month INR Nalco-73385 BIOCIDE 30 885 26,550 50 15 13,275 Nalco-73550 BIODETERGENT 18 780 14,040 50 9 7,020 Nalco-7320 CONTROL MICRO-ORGANISM 30 510 15,300 50 15 7,650 Nalco-7330 BIOCIDE 30 272 8,160 50 15 4,080 3DT-189 COOLING WATER TREATMENT 150 345 51,750 NIL 150 51,750 Nalco-3935 CONTROL MICROORGANISM 1,200 62 74,400 50 600 37,200 3DT-190 COOLING WATER TREATMENT 36 460 16,560 NIL 36 16,560 Sulphuric Acid 300 0 NIL 300 0 Sodium Hypochlorite 1,200 21 25,200 50 600 12,600 Total 231,960 150,135 Total Cost Savings Per Month Rs. 81,825 Total Cost Savings Per Year Rs. 981,900 Ozonator Cost (Supply + I & C + P & F + Tax) Rs. 1,345,000 Return On Investment [ROI] - Less than 16 months Yr 1.37 Reduction In Blow Down Water Quantity - Approx. 25 - 30 %
  16. 16. Installation Scheme Process Flow Diagram Suitable For 100 TR – 500 TR
  17. 17. Installation Scheme Process Flow Diagram Suitable For 300 TR – 5,000 TR
  18. 18. Installation Precautions • The feed gas preparation must include removal of particulate matter, moisture and oil. • Make-up water should be free from sediment, mud, and discoloration • Material of construction in the ozone treated system should be compatible with ozone • The ozone generator should be located in an air conditioned area for best ozone generation efficiency
  19. 19. Ozone Doze • 2.0 – 3.5 ppm in side stream water flow • 0.2 – 0.4 ppm in main stream water flow
  20. 20. Thanks Chemtronics Technologies (India) Pvt. Ltd. Solution Engineer : Mr. Sunil Shah - +91-93212 34527 E mail : sunilshah@chemtronicsindia.com www.chemtronicsindia.com www.ozonegeneratorindia.com

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