METHOD FOR SEPARATING NMP IN INDUSTRIAL WASTE WATER

摘要

PURPOSE: An isolation and collection method of NMP(N-Methyl-2-pyrrolidone) is provided to reuse expensive NMP organic solvent by economically collecting and to lower total nitrogen amount in water discharged after processing down to emission standard value. CONSTITUTION: An isolation and collection method of NMP isolates and collects NMP contained in industrial wastewater by polyamide reverse osmosis membrane module mounted in each unit shift by using a multi-stage system. A plurality of bessels in which multiple polyamide reverse osmosis membrane modules are embedded is arranged in parallel in order to form a stage. The multi-stage system is formed by gathering two or more of the stages.