Pollution Prevention and Control Technologies for Plating Operations

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Section 4 - Chemical Solution Maintenance

4.8 DIFFUSION DIALYSIS

4.8.5 Costs
4.8.5.1 Capital Costs
4.8.5.2 Operating Costs

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4.8.5.1 Capital Costs

Diffusion dialysis units can be operated on either a batch or continuous basis. When operated on a batch basis the units are sized to process the contaminated acid bath within a period permissible downtime period. More frequently, the units are operated on a continuous basis and are sized based on the contaminant introduction rate. In this case, the minimum sized system is one that is capable of processing the entire bath volume in the same time interval that dumping had been previously scheduled (ref. 192). Owing to the newness of the technology, it may be prudent for the user to validate design expectations through pilot testing (ref. 192).

Capital costs for diffusion dialysis equipment is shown in Exhibit 4-37.

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4.8.5.2 Operating Costs

The primary operating cost items for the diffusion dialysis technology include: O&M labor, energy, DI water, and membrane replacement. The operating costs were estimated by a vendor to be $0.78 per gallon of acid feed (ref. Kinetic Recovery Corporation file).

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