Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Development of a Multifunctional Design Concept to Improve Constructed Wetland Performance

인공습지의 성능향상을 위한 다기능 설계기법 개발

  • Reyes, N.J.D.G. (Department of Civil and Environmental Engineering, Kongju National University) ;
  • Choi, H.S. (Department of Civil and Environmental Engineering, Kongju National University) ;
  • Kim, L.H. (Department of Civil and Environmental Engineering, Kongju National University)
  • ;
  • 최혜선 (공주대학교 토목 환경 공학과) ;
  • 김이형 (공주대학교 토목 환경 공학과)
  • Received : 2020.04.29
  • Accepted : 2020.05.25
  • Published : 2020.05.31
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Abstract

Constructed wetlands (CWs) are widely used to solve water quality problems caused by diffuse pollution from agricultural areas; however, phytoplankton blooms in CW systems can occur due to long hydraulic retention time (HRT), high nutrient loading, and exposure to sunlight. This study was conducted to evaluate the efficiency of a CW designed to treat agricultural diffuse pollution and develop a design concept to improve the nature-based capabilities of the system. Monitoring was conducted to assess contribution of individual wetland components (i.e. water, sediments, and plants) in the treatment performance of the system. During dry days, the turbidity and particulates concentration in the CW increased by 80 to 197% and 10 to 87%, respectively, due to the excessive growth of phytoplankton. On storm events, the concentration of particulates, organics, and nutrients were reduced by 43% to 70%, 22% to 49%, and 15% to 69% due to adequate water circulation and constant flushing of pollutants in the system. Based on the results, adequate water circulation is necessary to improve the performance of the CW. Free water surface CWs are usually designed to have a constant water level; however, the climate in South Korea is characterized by distinct dry and rainy seasons, which may not be suitable for this conventional design. This study presented a concept of multifunctional design in order to solve current CW design problems and improve the flood control, water quality management, and environmental functions of the facility.

농업비점오염에 의한 수질문제 해결을 위하여 인공습지 조성이 늘어나고 있으나 긴 체류시간과 긴 일조량 등으로 인하여 습지 내 조류 발생 등의 문제가 지속적으로 발생하고 있다. 본 연구는 농업 비점오염원관리를 위하여 조성된 인공습지의 효율을 평가하여 자연기반 능력이 향상된 고도화된 인공습지 개선방안을 제시하고자 수행되었다. 인공습지의 성능평가는 구성성분(물, 퇴적물 및 식물)의 모니터링을 통해 구성성분이 시스템의 처리 성능에 주는 기여도 평가를 통해 수행되었다. 건기시에는 식물성 플랑크톤의 과다성장, 긴 체류시간 및 일조량 과다로 습지내 탁도 및 미립자 농도가 각각 80~197 % 및 10~87 %정도 증가하는 것으로 나타났다. 그러나 강우시에는 습지내 적절한 물 순환과 지속적인 물 흐름으로 미립자, 유기물 및 영양분의 농도가 43 ~ 70 %, 22 ~ 49 %, 15 ~ 69 % 정도 감소하는 것으로 나타났다. 이러한 연구결과로 볼 때 인공습지가 가진 문제해결을 위해서는 자연습지가 가진 안정적 물 흐름이 필요하다는 것을 알수 있다. 그러나 일정수심을 유지하도록 되어있는 인공습지 설계기준은 건기와 강우기가 뚜렷하게 나타나는 한국적 기후상황에 타당하지 않다. 따라서 본 연구에서는 인공습지가 가진 문제를 해결하고 홍수관리, 수질 관리 및 환경 기능을 지속적으로 유지할 수 있도록 다기능 설계기법을 개념화하였다.

Keywords

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