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Membrane filtration technology is based on a selective filtration through a pressure -driven membrane. The membrane has charged groups that selectively reject multivalent anions such as SO42- . The membrane does not separate monovalent ionic species such as Cl- or CLO3- from the feed solution.
To maximize the membrane area within a compact space, the membranes are packaged as cylindrical elements in a spiral wound configuration .
Feed brine floods the entire feed side of the membrane surface within the membrane element by flowing within a mesh spacer.Brine then permeates through the membrane,where the sulphate is rejected,and flows in a spiral pattern through the permeate carrier,towards the perforated perforated permeate tube.
To achieve the required membrane area,several membrane elements are packed into several high pressure housing.The high-pressure housings are arranged in series to provide the required number of stages to concentrate the sodium Sulphate solution.
The membrane filtration unit usually treats dechlorinated depleted brine from the chlor-alkali electrolyzer. It is at this location that athe Na2SO4 concentration is at its highest and the NaCL concentration is at its lowest. Normally only a portion of the dechlorinated brine flow needs to be passed through Sulphate removal system , the remainder bypasses the Sulphate remove system and is returned to the saturators.