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Membrane process is one of the advanced wastewater technologies, which provides high water quality, water quantities with short operation period, and removes contaminated effluent organic matter. This process is significantly useful to improve water quality for water reuse process. This research studied the removal efficiency of effluent organic matter (Efom) using cross flow nanofiltration membrane (HL4040FN, GE water and process technology). Wastewater effluents, collected from wastewater treatment plants in Ubon Ratchathani University, were pretreated with ion exchange resin and sequentially filtered through 10, 5 and 1 mm cartridge filters. The organic matter from pretreated water was subsequently separated by reverse osmosis. Experimental results revealed that increased Efom concentration caused an increase in solution flux decline, possibly due to organic matter accumulation on membrane surface, thus increasing organic matter removal. Increase pH solution resulted in decreasing permeate flux, while nanofiltration membrane could remove relatively high effluent organic matter about 94-98%.
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