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Merit Partnership Case Studies: Chapter 02: Reverse Osmosis Applications

Chapter Abstract: This is clip 2 of 5 for this video. Reverse Osmosis (RO) applications were presented as a Merit pollution prevention project. RO involves separating a solute from water by forcing the water through a semi-permeable membrane. Two RO units were installed at the Danco facility in Ontario, California. The parts follow the same flow through the process of cleaning, etching, Sulfuric Acid anodizing, red, blue, black dying, Nickel Acetate and hot DI water sealing. The two operation suitable for RO were black dying and Nickel Acetate sealing. Each of these consisted of two process tanks followed by a rinse tank. The overflow of the rinse tank discharged directly into the sewer contributing to Chromium and Nickel levels in the discharge. The discharge was diverted to the RO units once they were in place. The black dye or Nickel Acetate removed from the water is returned to the process tanks while clean water is pumped back into a second rinse tank.
Author: US EPA Region IX / MFASC / CMTC
Publication Date: 1997

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