Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Comparative Analysis of Seawater Desalination Technology in Korea and Overseas

국내 및 해외의 해수담수화 기술 비교분석

  • Hwang, Moon-Hyun (Global Desalination Research Center, Gwangju Institute of Science and Technology) ;
  • Kim, In S. (Global Desalination Research Center, Gwangju Institute of Science and Technology)
  • 황문현 (광주과학기술원 글로벌담수화연구센터) ;
  • 김인수 (광주과학기술원 글로벌담수화연구센터)
  • Received : 2016.02.29
  • Accepted : 2016.04.11
  • Published : 2016.05.31
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Abstract

Climate change has increased the need to secure a new water resource in addition to the traditional water resources such as surface water and ground water. The seawater desalination market is growing sharply in accordance with this situation in Korea, "seawater engineering & architecture of high efficiency reverse osmosis (SEAHERO)" program was launched in 2007 to keep pace with world market trend. SEAHERO program was completed in 2014, contributed to turn the domestic technology in evaporative desalination technology to RO desalination technology. Currently, it is investigated that the average specific energy consumption of the whole RO plant is around $3.5kWh/m^3$. The Busan Gi-jang plant has shown $3.7{\sim}4.0kWh/m^3$, including operational electricity for plant and maintenance building. Although not world top level, domestic RO technology is considered to be able to compete in desalination market. Separately, many researchers in the world are developing new technologies for energy savings. Various processes, forward osmosis (FO), membrane distillation (MD) process are expected to compete with RO in the future market. In Korea, FO-RO hybrid process, MD and pressure retarded osmosis (PRO) process are under development through the research program in Ministry of Land, Infrastructure and Transport (MOLIT). The desalination technology level is expected to decrease to $2.5kWh/m^3$.

기후변화는 현재 사용되고 있는 지표수 및 지하수 등의 담수자원 외에도 새로운 수자원을 확보해야할 필요성을 증가시켰다. 해수담수화 시장은 이러한 변화에 따라서 매년 급증하고 있는 상황이며, 이에 발맞추어 2007년 해수담수화 플랜트 사업단이 국내에서 출범하였다. 2014년에 종료된 해수담수화플랜트 사업단은 증발식 해수담수화 기술에 치우친 국내 기술을 역삼투방식 해수담수화 기술로 선회할 수 있도록 이끌었다. 현재 세계 최고의 역삼투방식 해수담수화 기술 에너지 효율성은 약 $3.5kWh/m^3$ 전후로 조사된다. 기장 플랜트의 수준은 $3.8{\sim}4.0kWh/m^3$ 수준으로 비록 세계 최고 수준에는 미치지 못하나, 선두권이라 하기에는 부족함이 없는 것으로 사료된다. 한편, 세계 역삼투방식 해수담수화 기술은 평준화 수준에 이른 것으로 사료되며, 에너지 저감을 위해 새로운 기술을 개발하고자 경쟁중이다. 미래 해수담수 시장에서 경쟁할 것으로 예상되는 기술로 정삼투공정, 막증발법 등이 있으며, 이를 위해 국내에서도 정역삼투 융합공정 개발, 막증발법 및 얍력지연삼투등의 기술개발을 진행중에 있다. 이를 통하여 국내 기술수준을 $2.5kWh/m^3$까지 낮출 것으로 기대된다.

Keywords

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