Suspended growth activated sludge treatment system using membranes for liquids/solids In immersed systems, the module is suspended in the process tank and submerged in the liquid to be treated. 3-9 psig vacuum on the fibers. Permeate is drawn through the membrane material to the inside of the fibers and withdrawn from the system.To minimize solids buildup on the outside of the fibers, course bubbles are introduced directly beneath the fibers.Since the fibers are loose, the action of the coarse bubbles cleans the fibers and causes additional mechanical cleaning as the fibers move against each other
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