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DISCO HOME > Solutions > Kiru, Kezuru, Migaku Topics > An ultra-compact (DWR series) deionized water recycling unit for use with dicing saws > Advantage 3: Reduced Water Usage

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An ultra-compact (DWR series) deionized water recycling unit for use with dicing saws

Advantage 3: Reduced water usage
Advantage of using DWR: x10
3. Reduced Water Usage
When producing deionized water from impure water (including city water), a reverse osmosis membrane is used to remove ion, saline, and particles. When filtering impure water using a reverse osmosis membrane, pressure needs to be applied. The higher the saline concentration in impure water, the more pressure is required, increasing the facility costs. In general, 1/3 of the input water is taken out for deionized water, and the remaining 2/3 is simply drained. Thus, 36 L/min of city water is required to supply 12 L/min of deionized water to a dicing saw which is using a full-drainage deionized water plant.
In a conventional circular deionized water plant, a cross-flow filter is used for eliminating particles. Therefore, the deionized water collection rate usually remains at 90%. Even if 12 L/min of deionized water is supplied, 1.2 L/min will be wasted, and so the same amount of deionized water needs to be added back. To produce 1.2 L/min of deionized water, 3.6 L/min (three times the amount) of city water is required.

In DWR1722, all of the water is circulated. However, about 0.5 to 0.6 L/min of deionized water is consumed because the water becomes mist in the dicing saw and is vacuumed out through the duct. To add back in the same amount of deionized water, 0.18 L/min of city water (three times the replacement amount) is required.
As a result, water consumption can be reduced down to 1/200 the consumption of full-drainage deionized plants, realizing significant water savings as low as 1/20 the cost of existing systems, even in comparison to circular deionized water plants.

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