Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Feasibility of Aquatic Plants (Eichhornia crassipes and Water dropwort) for Nutrients Removal

수생식물(부레옥잠 및 미나리)을 이용한 영양염류 제거에 관한 연구

  • Choi, Don-Hyeok (Sihwa Lake Environmental Management Center, Korea Water Resources Corporation) ;
  • Kang, Ho (Civil and Environmental Engineering, Chungnam National University) ;
  • Lee, Mi-Kyung (Sihwa Lake Environmental Management Center, Korea Water Resources Corporation)
  • 최돈혁 (한국수자원공사 시화호환경관리센터) ;
  • 강호 (충남대학교 토목환경공학부) ;
  • 이미경 (한국수자원공사 시화호환경관리센터)
  • Received : 2009.10.29
  • Accepted : 2010.01.15
  • Published : 2010.02.28
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Abstract

Feasibility of floating aquatic plants (Eichhornia crassipes and Water dropwort) was investigated in order to control of sewage depending on various initial loading in a lab scale test. In addition, field test was conducted to assess the uptake rate of nutrient by E. crassipes. Lab-scale test applying primary domestic effluent operated at 4 day HRT shows that the highest uptake rates were 1.06 g N/$m^2{\cdot}day$ and 0.39 g P/$m^2{\cdot}day$ in the E. crassipes reactor. BOD removal efficiency in E. crassipes reactor was as high as 80% when the loading value was lower than 185 kg BOD/$ha{\cdot}day$. While 70 ~ 80% removal efficiency of BOD was achieved when the loading value was lower 80 kg BOD/$ha{\cdot}day$ at the W. Dropwort reactor. Experiment results show that E.crassipes has a higher nutrients removal efficiency than W. dropwort under high pollutant loading. Input loadings of TN and TP should not exceed to 10 kg TN/$ha{\cdot}day$ and 2.0 kg TP/$ha{\cdot}day$ respectively to provide a 50% TN and 80% TP removal efficiencies using E. crassipes. The field test demonstrated that an annual yield of E. crassipes mass was estimated as a fresh weight of 30.9 $m^3/ha{\cdot}yr$. E. crassipes grown in field pads absorbed 76.7 kg N/$ha{\cdot}yr$ and 13.4 kg P/$ha{\cdot}yr$ as a dry weight.

본 연구에서는 수생식물 중 부레옥잠(Eichhornia crassipes)과 미나리(Water Dropwort)를 이용하여 유입수의 부하변동에 따른 수처리 효율을 Lab-scale 실험을 통해 평가하고, 부레옥잠을 현장 적용하여 식물생체내 흡수된 질소, 인의 함량을 산정 제시하고자 하였다. 부레옥잠 식물체내 N, P 흡수율은 하수의 1차처리수를 적용하였을때 HRT 4 day에서 가장 높은 흡수율 1.06 g N/$m^2{\cdot}day$과 0.39 g P/$m^2{\cdot}day$으로 각각 나타났다. 부레옥잠의 경우, BOD 부하 185 kg BOD/$ha{\cdot}day$ 이하에서 80% 이상의 높은 효율을 보였으며, 미나리를 적용한 경우에는 80 kg BOD/$ha{\cdot}day$ 이하에서 70~80%의 효율을 나타냈다. 질소와 인의 처리효율 역시 부레옥잠이 미나리 보다 높은 부하에서도 처리 효율이 높은 것으로 나타났다. 부레옥잠을 이용하여 50% 이상의 TN 처리효율을 달성하기 위해서는 HRT 2 day 이상, 10 kg TN/$ha{\cdot}day$ 이하로 부하를 유지해야하고, TP의 경우, 80% 이상의 처리효율을 위해서는 TP 부하를 2.0 kg TP/$ha{\cdot}day$ 이하로 유지해야 하는 것으로 나타났다. 부레옥잠을 이용한 50일 동안의 현장적용 실험 결과로 부터 부레옥잠의 연중생산량은 30.9 $m^3/ha{\cdot}yr$로 나타났으며, 질소와인의 연간 흡수율은 76.7 kg N/$ha{\cdot}yr$, 13.4 kg P/$ha{\cdot}yr$로 높게 나타났다.

Keywords

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