The overall project consists of several integrated research phases related to the applicability, continued development, demonstration, and commercialization of the SpinTek centrifugal membrane filtration process. This phase of work is a continuation of the Phase 1 evaluation of the SpinTek centrifugal membrane filtration technology. During Phase 1 testing conducted at the EERC using the SpinTek ST-IIL unit operating on a surrogate tank waste, a solids cake developed on the membrane surface. Solids cake development was observed where linear membrane velocities were less than 17.5 feet per second and resulted in a reduction of unobstructed membrane surface area of up to 25%, reducing overall filtration performance. The primary goal of the Phase 2 research effort is to enhance filtration performance through the development and testing of alternative designs of the turbulence promoters to generate a shear force across the entire membrane surface that is sufficient to maintain a self-cleaning membrane capability and improve filtration efficiency and long term performance. Specific Phase 2 research activities include the following: System modifications to accommodate an 11-inch-diameter, two-disk rotating membrane assembly. Development and fabrication of alternative designs to the existing turbulence promoters. *Testing and evaluation of the existing and alternative turbulence promoters under selected operating conditions using a statistically designed test matrix Data reduction and analysis.