ABSTRACT

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 475 Good Operating Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 476

Improving Part Drainage and Racking Practice . . . . . . . . . . . . . . . . . . . . . . . . . . . . 476 Monitoring Bath Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479 Monitoring Bath Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 480 Loss Prevention Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 482

Process Improvements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 483 Use Demineralized Water for Makeup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 483 Increase Tank Agitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 484 Eliminate Use of Air Sparging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 485 Remove Soils from the Bath . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 485 Employ Two-Stage Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 486

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 486

INTRODUCTION*

The adoption of pollution prevention practices in the field of cleaning should follow a prescribed sequence or hierarchy of investigation. The first step is to eliminate the need to clean by eliminating upstream contamination or by relaxing an overly critical cleanliness requirement. If this is not possible, and it usually is not to a large extent, the part or contaminant may be modified to enable the use of a less hazardous cleaning material or method.