I am writing to express our appreciation for the help we received from Cindy when we asked how we could decrease our chloride discharge to the city. The city is preparing for stricter chloride discharge regulations in the future and they had asked us to try to find ways to limit our discharge to the city sewer.
Through the Annual Review process we added a couple projects to our Value Generation Plan that Cindy recommended we do to lower our chloride discharge. The first project was to change from soft water to hard water make to our RO system. The second project was to install a brine reclaim system on our existing softener system that will be used for the remaining soft water requirements.
By using antiscalant ahead of the RO we were able to run hard city water to the RO eliminating 29% of our soft water demand. We saved 27.1 tons of salt from entering the environment this year by doing this and saved about 1/4 million gallons of wastewater going to the sewer.
Cindy introduced us to one of GE’s premier pre-treatment equipment distributors, Nathan Olszak (now with Complete Water Solutions), and he provided us with the polishing softener for the RO system and the brine reclaim system for our current softener system. He also recommended replacing the resin in the current softener system to save additional salt.
Based on calculations done by Cindy, we figure we used 10% less salt this year for making the remaining soft water needed for the cooling water, cleaning water and topping water by installing the brine reclaim system. This resulted in eliminating 1.7 tons of salt back into the environment.
Based on calculations done by Cindy, we figure we have reduced wastewater to the city by 36.4%. We saved about 1/2 million gallons of wastewater from going to the city by installing the brine reclaim system.
Therefore, the total impact to the environment is that we were able to save 3/4 million gallons of wastewater that would have had 28.9 tons of salt in it. Cost savings calculated out to be $4,624 this year for the salt and $6,464 in the city water and sewer costs.
In fact the city had sent over a letter commending us on our chloride discharge reduction. Their records indicate that we went from a 12,656 ppm weekly average of chlorides in our wastewater flow last year to 2,443 ppm weekly average of chlorides in our wastewater this year. The city was impressed with our reduction.
Here is the data that was used:
|Cases Produced (mm)
|Gals of brine used for softeners
|Tons of salt used for softeners
||(Based on 2.48 lbs of salt per gal of concentrate brine)
|Soft water use (mm of gals)
|Avg weekly chloride level (ppm)
|Gals of wastewater to city (mm of gals)
|Tons of softener salt total per mm cases
||(Result of RO and brine reclaim project)
|Tons of softener salt (minus RO) per mm gals
||(Results of the brine reclaim system)
|Feedwater to RO (mm gals)
|Soft water used per mm cases
|Tower water makeup (mm gals)
||(Higher cooling water use due to all the dumping and cleanings)
Plant Operations Manager