AWWA ACE65473

This powerpoint presentation outlines the following topics: Microfiltration (MF)/Ultrafiltration (UF) membrane clean-in-place (CIP) waste streams; regulatory aspects of membrane CIP wastes and residuals; treatment of CIP waste streams; and, pilot study results from return of treated phosphoric acid and citric acid CIP waste streams. Presentation summary includes: citric and phosphoric acid can both be treated with calcium chloride; the recycling of treated phosphoric acid CIP waste had no adverse impact on membrane operation; the recycling of treated citric acid CIP waste had no adverse impact on membrane operation; TOC concentration did increase after recycling treated citric acid CIP waste; and, careful consideration should be given to potential affects of recycle on primary treatment train performance.