PNNL has performed additional testing to assess strategies for improving long-time filtration performance. The tests were designed to observe how operational parameters like backpulse period, number of backpulses, and shifts in transmembrane pressure affected the filter flux. It was found that the filter could be conditioned with backpulsing, after which the flux does not decay as it does when operated continuously. The flux was also found to converge to similar values (over several different tests) after approximately 4 to 6 hours despite the magnitude of the initial flux. This indicates that after a period of initial variability in the flux, a fouling mechanism that does not depend on initial conditions dominates the filtration performance (i.e. cake formation and maturation).
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