Near-Zero Water Recycler Metal Finishing Essential During Drought

The Near-Zero Water Recycler is designed specifically for Tru Temp process lines up to 200 gallons in tank size.

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Birchwood Technologies’ Near-Zero water recycler for the Tru Temp black oxide process reuses the rinse water in the Tru Temp process line, reducing water consumption by 99 percent. For black oxide users in California with a 25 percent water reduction law, and other locations facing severe water shortages, metal finishers can continue critical metal finishing operations with tight water usage guidelines.

A normal 100-gallon Tru Temp black oxide process line uses three flowing rinse tanks, each using about two gallons of water per minute when flowed to the drain. When operated for one shift per day for a month, the total water consumption is about 63,000 gallons—all going to the city sewer as non-hazardous discharge.

The Near-Zero water recycler allows the user to recycle and reuse the rinse water in the process tanks for about a month. The Near-Zero filter media is then changed, and all three rinse tanks are purged and refilled with fresh water. A 100-gallon-size tank line would require about 600 gallons of water each time the system is purged—a 99 percent reduction in water usage.

The Near-Zero Water Recycler is designed specifically for Tru Temp process lines up to 200 gallons in tank size, and is completely pre-engineered for fast setup. The system can be integrated into most Tru Temp tank lines in less than a day.

The Tru Temp in-house process produces Mil Spec/RoHS compliant black oxide finishes, with a 30-minute process time. The Tru Temp bath operates at 200°F and forms a non-dimensional, high quality black magnetite finish on all types of cast iron or carbon steel tooling and machine components. Because the process uses a short cycle time, it streamlines part movement, provides better control of finished part inventory and enhances ISO accountability.