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POWER PURGE® DEIONIZATION SYSTEMS
HIGH EFFICIENCY DI

Super economical PLC automated systems for deionized water with Power Purge. Remco Engineering designs automated deionization systems to provide the most economical operating cost and lowest maintenance costs of any system available. Remco Engineering's Power Purge deionizing systems minimizes regenerant use and rinse water requirements by using regenerant and rinse water efficiently. Our systems can save up to 50% of the rinse water used during the ion exchange regeneration cycle when compared to other systems.

Click her for more than you ever wanted to know about Deionization

1. Rinse, to remove sediment, undersize resin particles, and reclassify the bed;
2. Regenerate with acid or caustic (depending on resin type);
3. Rinse again to remove excess regenerant.

Traditional systems run all three cycles sequentially, using the second to push out the first and the third to push out the second. If you think about it, you will see that you will get dilution of the regenerant and no clear break between the regenerant and the rinse water.

Our Power Purge ion exchange regeneration system isolates the regenerant by removing all (over 98%) of the water from the column before adding the regenerant to the system. After regeneration, we purge the remaining regenerant from the system before adding any rinse water. This reduces the overall rinse water requirements dramatically. Final rinsing is a rinse-leach-purge step rinse operation that efficiently uses a minimal amount of water. Each time the column fills with rinse water, the system waits until the water and resin reach an equilibrium condition (concentration inside the bead = concentration in the water) then we purge the water and refill. This allows us extensive control over the process and, in some cases, even allows us to mix anion and cation bed rinse water to achieve mutual neutralization.

Sophisticated PLC Automation -

Remco Engineering sells fully automated systems using microprocessor based programmable logic controllers to control the regeneration process. We find that manual deionization systems are very uneconomical to operate when viewed from both your costs to operate and the costs to support continuous personnel training and retraining. We put our expertise in a box inside the control panel so you don't have to call us every time you regenerate to figure out which valves to open and close. Because we sell automated systems that are computer ready, we can integrate pump and level controls, alarms, conductivity and other process sensors, and remote interfaces. We offer the most sophisticated deionization systems available.

Sizing a system based on water use.Two requirements determine the size of a system:

1. Maximum demand (gpm peak),
2. Average demand (gpm average per day).

The first governs the amount of storage you will need, the second sizes the flow rate.

For example:

1. If you need 200 gallons to fill a tank 3 times per day and 2 gpm continuously for rinsing, then over an 8 hour day, you would need a total of 1560 gallons (8 x 120 gal/hr + 600) or about 3.25 gallons per minute. A 5 gpm system would be large enough with a 300 gallon storage tank for tank fills. If the tank fills were all at once, you would need enough storage to cover all of them.

2. Ten(10) gpm required continuously with tank fills of 85 gallons each every hour. The total requirement would be about 11.5 gpm. We would recommend a 12-15 gpm system with about 200 gallons of storage as a minimum.

Column Sizing a 5 gpm system. (calculations)The actual physical size of system you will need will vary depending on the quality of the water you wish to deionize. Deionization systems use a resin that has a certain capacity given as kilograins of calcium carbonate per cubic foot. A grain is 17.1 ppm. The actual operating capacity is less than 100% and is based on the amount of regenerant (acid or caustic) added during regeneration. Doing a complete regeneration wastes a lot of regenerant so systems are regenerated to an economical range of 60-70 percent of theoretical capacity.

There are a lot of calculations to determine actual capacity of a specific resin with a specific water chemistry so we have a quick formula to do a rough 80% estimate of capacity.

Cation columns

1. Take your water TDS (total dissolved solids) analysis.
2. Look at Calcium, Magnesium and Sodium concentrations in ppm.
3. Add up the total ppm and divide by 17.1 (i.e., 250 ppm/17.1 = 14.6 grains/gal).
4. Assuming a conservative 16 kilograin/cu. ft. capacity with an economical regeneration, now divide 16,000 by 14.6 (16000/14.6 = 1095).
5. You will get over a thousand gallons of decationized water per cubic foot of resin.

Anion columns

1. Next add up the anions, they should be equal to the cations plus silica (SiO2) and dissolved CO2 .
2. Add up the anions plus silica and carbon dioxide in ppm. Lets say total carbonate and silica is 20 ppm.
3. Take the total anion ppm and divide by 17.1 (270 (250+20)ppm /17.1 = 15.8 gr/gal..).
4. Divide 14 kilograin/cu.ft by your answer (14,000/15.8 =886 gallons per cubic foot).
5. A 5 gpm system would require about 2.5 cu.ft. of cation resin and about 3 cubic feet of anion resin, resulting in about 2500 gallons of DI water between regenerations.

If you need more than 2500 gallons between regenerations such as 5 gpm for 16 hours then regenerate at night, you would have to double the resin capacity of the system to 5000 gallons.
Factors effecting the capacity of the system are the relative amount of Sodium, Chloride, and weak acids in the water. These can change the capacity by 20 to 30% as can the regenerant loading used.

Fax us your water analysis and flow requirements and we will fax you your systems parameters.