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.

1. Rethink Cooling Towers
Side Stream Filtration
&
Ozonation

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. 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. Requirement
Customiz
ation
Optimiz
ation
Integrat
ion

5. Solution
• Main stream or side stream filtration
• Optimized diffusion of Ozone

6. Solution - Filtration
• Side stream filtration of 8 – 12 % of mainstream flow
• Automatic Self cleaning filter
• Pressure Sand Filter

7. Advantages - PSF
• Worldwide proven technology
• Depth Filtration
• Excellent for fine silt
• Online
• Very low waste water
• Long life
• Negligible maintenance

8. Ozone Generation
Oxygen Preparation
Ozone Generation
Ozone Injection
Ozone Diffusion
Ozone Contactor

9. Oxygen Preparation
• Oxygen From Ambient Air
• Oxygen concentrator
• More than 90% concentration
• Dry Industrial Grade Oxygen

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. Ozone Injection & Diffusion
• Venturi Ejector
• Sparger
• Chemone Diffuser cum Contactor
• Valves, pumps etc
• Water Trap
• Ozone Vent

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. 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. 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. 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. Installation Scheme
Process Flow
Diagram
Suitable For
100 TR – 500
TR

17. Installation Scheme
Process Flow
Diagram
Suitable For
300 TR – 5,000 TR

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. Ozone Doze
• 2.0 – 3.5 ppm in side stream water flow
• 0.2 – 0.4 ppm in main stream water flow

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