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인공습지의 성능향상을 위한 다기능 설계기법 개발
Development of a Multifunctional Design Concept to Improve Constructed Wetland Performance 원문보기

한국습지학회지 = Journal of wetlands research, v.22 no.2, 2020년, pp.161 - 170  

(공주대학교 토목 환경 공학과) ,  최혜선 (공주대학교 토목 환경 공학과) ,  김이형 (공주대학교 토목 환경 공학과)

초록
AI-Helper 아이콘AI-Helper

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.

Abstract ▼ AI-Helper 아이콘AI-Helper

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 ...

주제어

#습지식물   #인공습지 설계   #인공습지 수질   #자연기반해법   #퇴적물  

표/그림 (7)

AI 본문요약
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* AI 자동 식별 결과로 적합하지 않은 문장이 있을 수 있으니, 이용에 유의하시기 바랍니다.

제안 방법

  • Macrophytes also enhanced the nutrient removal efficiency of the system through nutrient uptake mechanisms; however, intermittent loading may limit the uptake capabilities of the plants. Based on the patterns of pollutant removal and analyses of wetland components, a multifunctional design was conceptualized to improve the flood control, water quality management, and environmental functions of the CW. Varying water levels in wetland cells and different elevation of outlet ports in the CW design can induce effective water circulation and provide a favorable environment for the biotic components of CW systems.
  • During storm events, the first sample was collected after an observed increase in water level to account for the runoff delay in the catchment area. Succeeding samples were collected at 5, 10, 15, 30, and 60-minute intervals. Additional six samples were collected at an hourly interval to complete the 12 inflow and outflow samples.
  • Moreover, a multifunctional design was not yet conceptualized to improve CW processes. This study evaluated the contributory factors affecting the treatment performance of a CW by examining the vital components of the facility. A multifunctional design concept was also developed based on the assessment of the current CW design in order to optimize facility functions and operations.
  • Nature-based approaches provide effective and low-cost alternatives for treating polluted water. This study successfully evaluated the performance of a CW in reducing pollutant loads from a polluted river through an in-depth analyses of primary wetland components. During dry days, lack of inflow prompted stagnation of water and proliferation of phytoplankton in the system which resulted to 80% to 197%and 10% to 87% increase in turbidity and TSS concentrations,respectively, at different treatment zones.

대상 데이터

  • The CW utilized in the study is a free water surface CW located midstream of Geum River at Gongju City, South Korea. The facility was designed and operated by the Ministry of Environment to treat a portion of an intermittent streamimpacted by agricultural activities.
  • On storm events, combined stream discharge and stormwater runoff from a 465-hacatchment area composed of 73% forest, 25% agricultural, and 2% urban land use types was also redirected to the CW for treatment. The facility has a surface area of 3,282 m2, storage volume amounting to 2,957 m3, and a design hydraulic retention time (HRT) of 16.8 hours. The first treatment unit was consisted of a sedimentation zone intended to remove large particles by means of gravitational settling.

이론/모형

  • Representative samples were cut to ground level and oven-dried to determine the plant biomass.Kjeldahl method was used to quantify N and P concentrationsin plant tissues.
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