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REMOVAL OF CHLORINATED ALKENE SOLVENTS FROM DRINKING WATER BY VARIOUS REVERSE OSMOSIS MEMBRANES
Citation:
Fronk*, C. A. REMOVAL OF CHLORINATED ALKENE SOLVENTS FROM DRINKING WATER BY VARIOUS REVERSE OSMOSIS MEMBRANES. AQUA. IWA Publishing, London, Uk, 47(4):183-195, (1998).
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Description:
Historically, membranes have been used to desalinate water. As new membrane materials are developed, traditional water treatment schemes may incorporate membrane technologies, such as reverse osmosis, to address a variety of new concerns such as low molecular weight volatile organic solvents, inorganics and microbiological components. The simple, chlorinated alkenes are an important chemical group used industrially as solvents in textile and degreasing applications. The present paper reviews the reverse osmosis removal of a subclass of regulated alkenes from drinking water: the low molecular weight (MW = 97-166), 2-carbon, chlorinated alkenes, cis and trans-1,2-Dichloroethylene, Trichloroethylene and Tetrachloroethylene. Six reverse osmosis membranes were pilot tested: a cellulose acetate, a polyamide (hollow fiber), and four different types of thin film composites. Although the cellulose acetate and polyamide membranes were not effective for the low MW, chlorinated alkenes, some of the thin film composite membranes removed 35 % of the cis - 1,2-Dichloroethylene , 50 -70 % of the Trichloroethylene and 70-80% of the Tetrachloroethylene. Preliminary results from other researchers also indicate that newer, thin-film composites may remove > 75-100 % of certain low MW alkenes (132 -166) and also show promise for drinking water treatment.
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REMOVAL OF CHLORINATED ALKENE SOLVENTS FROM DRINKING WATER BY VARIOUS REVERSE OSMOSIS MEMBRANES