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Innovative Uses of Cooling Tower Discharge Water 

02-28-2019 15:15


Even a small cooling tower running at a 1000 ton load and 5 cycles of concentration will discharge almost 4 million gallons of water a year. While we can help reduce that volume with the use of Ozone to treat the water with an Optimization Strategy, there is still a significant volume of water that is going unused or is wasted. Since Ozonated cooling tower water is free of chemicals, further steps can be taken to Augment Water Resource Conservation along with reducing tower bleed. Reusing this water can significantly reduce outside water demand in other areas. Combining technologies such as Reverse Osmosis and filtration, can also open supplementary doors for the use of this water. An Electric Driven Chiller used for HVAC is often configured for heat rejection through evaporation. Water cooled systems operate more efficiently than air cooled systems, but in this day of conservation, especially in areas where water resources are limited, more effectual use of water is becoming critical. Employing Ozone as a standalone treatment package will assist in decreasing water consumption. But what about the water that still must be discharged to maintain proper water chemistry balance? Since the waste by-product of the Ozone used to treat the system is Oxygen, this water is chemical free. Now the waste water can be re-employed for some other purpose, thus reducing overall water demand. The discharge water from an Ozone treated system is disinfected and relatively free of any organic material. Using the water to replenish the aquifer greatly benefits the regional water table. Reuse for this discharge water is a good source of irrigation, further reducing supply demand. Creating decorative lakes with this water is yet another benefit to a facility or campus.

Session 6C: Operation & Maintenance Best Practices


Lex LaMotte, LaMotte Water Management


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Uploaded - 02-28-2019