Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Comparison of Performances of Forward Osmosis and Membrane Distillation Processes for Shale Gas Plant Water Treatment

셰일가스 플랜트 용수 처리를 위한 정삼투(FO)와 막증발(MD) 공정의 성능 비교

  • Koo, Jaewuk (Environmental & Plant Engineering Institute Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Sangho (Dept. of Civil and Environmental Engineering, Kookmin Univ.) ;
  • Shin, Yonghyun (Dept. of Civil and Environmental Engineering, Kookmin Univ.) ;
  • Yun, Taekgeun (Dept. of Civil and Environmental Engineering, Kookmin Univ.)
  • 구재욱 (한국건설기술연구원 환경.플랜트연구소) ;
  • 이상호 (국민대학교 건설시스템공학부) ;
  • 신용현 (국민대학교 건설시스템공학부) ;
  • 윤택근 (국민대학교 건설시스템공학부)
  • Received : 2014.01.23
  • Accepted : 2015.01.12
  • Published : 2015.03.01
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Abstract

As non-conventional oil resources such as shale gas have been widely developed, proper treatment of flowback and produced water is becoming important. However, application of conventional water treatment techniques is limited due to high concentration of pollutants such as oil and grease, organics, harmful chemicals, and inorganic ions. In this study, we examined the feasibility of using forward osmosis (FO) and air gap membrane distillation (AGMD) as novel treatment options for shale gas wastewater. Laboratory-scale FO and MD devices were fabricated and used for the experiments. Results showed that FO could be used to treat the synthetic wastewater. Using 5 M NaCl as the draw solution, the flux was approximately $6L/m^2-hr$ during the treatment of low range wastewater (TDS: 66,000 mg/L). Nevertheless, AGMD was more effective to treat high range wastewater (Total Dissolved Solid: 260,000 mg/L) than FO.

전 세계적으로 셰일가스와 같은 비전통 석유자원이 널리 개발되고 있다. 이에 따라 셰일가스 채굴과정에서 발생하는 폐수의 적절한 처리가 중요해지고 있다. 그러나, 폐수 내의 오일 및 유기 물질, 유해성 화학물질, 무기 이온과 같은 물질이 고농도로 함유하고 있기 때문에 기존 처리 방법으로 많은 어려움을 격고 있다. 본 연구에서는 셰일가스 폐수에 대한 새로운 처리방법으로 정삼투 공정 및 막증발법에서의 가능성을 연구하였다. 실험실 규모의 정삼투 및 막증발법 장치를 제작하여 실험을 실시하였다. 그 결과, 합성 폐수를 처리하는데, 정삼투 공정에서 적용 가능하다고 판단되었다. 유도용액으로 5M의 염화나트륨수용액을 사용하였고, 낮은 범위의 폐수(66,000mg/L TDS)에서 약 $6L/m^2-hr$의 플럭스를 나타냈다. 그럼에도 불구하고, 높은 범위의 폐수(261,000mg/L TDS)에서 막증발법으로 처리하는 것이 더 효과적이었다.

Keywords

References

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