International Products Corporation

Four Membrane Cleaning Profiles with Micro-90® Alkaline Cleaning Solution, Micro® Green Clean Biodegradable Cleaner and Micro® A07 Citric Acid Cleaner

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SUMMARY
Fouling and cleaning profiles of four types of filter membranes were obtained using MICRO-90®, MICRO® GREEN CLEAN and/or MICRO® A07. Simulated fouling processes were performed by using either a synthetic oil emulsion or a combination of the synthetic oil emulsion and a calcium acetate salt bridge mixture. Excellent recovery of permeate flux was obtained with the lowest to be 96.0%. The results prove that MICRO-90®, MICRO® GREEN CLEAN and MICRO® A07 are effective at cleaning these types of membranes.

In all four trials, some delamination of the membranes occurred around their perimeters, probably due to the seeding of the membranes in the filtration unit.

Some flux variation occurred during the trials because the optimal pressure of each membrane was controlled manually. This can be seen in instances where the flux rate exceeds 100%.

PURPOSE
To evaluate the cleaning efficiency of MICRO-90®, MICRO® GREEN CLEAN and MICRO® A07 on four GE flat sheet membranes in the GE Osmonics SEPA CF II filtration unit. The four membranes include a Cellulosic NF polymer, a proprietary thin film, a polyethersulfone, and an Ultrafillic UF membrane.

INTRODUCTION
Simulated cleaning profiles are valued by potential customers as providing assurance that candidate cleaners will perform as anticipated in their filtration processes. Laboratory-based performance data, along with technical support and sufficient samples for on-site cleaning trials, ensure a quick and successful transition to a more effective cleaning regimen.

In this project, a GE Osmonics SEPA CF II filtration unit was used for the simulated fouling-cleaning experiments on four types of filter membranes using MICRO-90®, MICRO® GREEN CLEAN and/or MICRO® A07 as the cleaners. Because of the pH constraints of the Cellulosic NF and the Ultrafillic membranes, only MICRO® A07 was evaluated in these trials.

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