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Received November 10, 2012
Accepted December 9, 2012
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정삼투식 담수공정의 유도용질 회수를 위한 흡수용액 성능 평가
Performance Evaluation of Absorbent Solution for Draw Solute Recovery in Forward Osmosis Desalination Process
한국기계연구원 열공정극한기술연구실, 305-343 대전 유성구 가정북로 156
Department of Thermal Systems, Korea Institute of Machinery & Materials, 156 Gajeongbuk-ro, Yuseong-gu, Daejeon 305-343, Korea
konghoon@kimm.re.kr
Korean Chemical Engineering Research, April 2013, 51(2), 240-244(5), 10.9713/kcer.2013.51.2.240 Epub 21 May 2013
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Abstract
정삼투식 담수화 기술은 차세대 담수 방법으로 주목을 받고 있으나, 상용화를 위해서는 유도용액 처리공정에서의 에너지 효율 향상을 필요로 한다. 중탄산암모늄을 유도용질로 이용하는 정삼투식 담수화 시스템은 정삼투 막모듈, 유도용액 분리공정, 유도용액 회수공정으로 이루어진다. 담수 생산을 위한 유도용액 분리공정에서 발생하는 암모니아와 이산화탄소의 혼합기체는 연속운전 및 경제성 향상을 위하여 회수되어 중탄산암모늄 용액으로 재농축되어야 한다. 이러한 유도용액 회수공정의 흡수액으로 희석된 중탄산암모늄 용액을 이용하는 방법이 있다. 본 연구에서는 용액의 농도에 따른 흡수성능 및 특성을 관찰하기 위한 실험을 수행하였고, 정삼투식 담수 공정에서 중탄산암모늄 용액을 분리된 암모니아와 이산화탄소 재농축에 이용할 수 있음을 확인하였다. 본 연구의 결과는 파일럿급 정삼투식 담수 공정의 설계 및 운전에 활용될 예정이다.
Although forward osmosis desalination technology has drawn substantial attention as a next-generation desalination method, the energy efficiency of its draw solution treatment process should be improved for its commercialization. When ammonium bicarbonate is used as the draw solute, the system consists of forward-osmosis membrane modules, draw solution separation and recovery processes. Mixed gases of ammonia and carbon dioxide generated during the draws solution separation, need to be recovered to re-concentrate ammonium bicarbonate solution, for continuous operation as well as for the economic feasibility. The diluted ammonium bicarbonate solution has been proposed as the absorbent for the draw solution regeneration. In this study, experiments are conducted to investigate performance and features of the absorption corresponding to absorbent concentration. It is concluded that ammonium bicarbonate solution_x000D_
can be used to recover the generated ammonia and carbon dioxide. The results will be applied to design and operation of pilot-scale forward-osmosis desalination system.
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Kirts RE, “Method and Apparatus for Producing Potable Water from Seawater Using Forward Osmosis,” US 2009/0308727 A1 (2009)
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Resnik KP, Yeh JT, Pennline HW, Int. J. Environ. Tech. and Manag., 4, 1/2 (2004)
