Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Assessment of Water and Pollutant Mass Balance by Soil Amendment on Infiltration Trench

침투도랑 토양치환의 물순환 및 비점오염물질저감 효과 평가

  • Jeon, Minsu (Department of Civil Engineering, Kongju National University) ;
  • Choi, Hyeseon (Department of Civil Engineering, Kongju National University) ;
  • Kang, Heeman (Deputy Research Director, Environment Research Division, Korea Expressway Corporation) ;
  • Kim, Lee-hyung (Department of Civil Engineering, Kongju National University)
  • 전민수 (공주대학교 건설환경공학과) ;
  • 최혜선 (공주대학교 건설환경공학과) ;
  • 강희만 (한국도로공사 도로교통연구원) ;
  • 김이형 (공주대학교 건설환경공학과)
  • Received : 2020.05.01
  • Accepted : 2020.05.21
  • Published : 2020.05.31
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Abstract

Highways are characterized by high non-point pollutant emissions due to high traffic volumes and sections that cause abrupt change in driving speed (i.e. rest stations, ticketing office, etc.). Most highways in Korea were constructed with layers that do not allow adequate infiltration. Moreover, non-point pollution reduction facilities were not commonly installed on domestic highways. This study was conducted to evaluate a facility treating highway runoff and develop a cost-effective design for infiltration facilities by using soil amendment techniques. Performing soil amendment increased the hydraulic retention time (HRT) and infiltration rate in the facility by approximately 30% and 20%, respectively. The facility's efficiency of removing non-point pollutants (Total Suspend Soiled (TSS), Chemical Oxygen Demand(COD), Biological Oxygen Demand(BOD), Total Nitrogen (TN) and Total Phosphorus, (TP) were also increased by 20%. Performing soil amendment on areas with low permeability can increase the infiltration rates by improving the storage volume capacity, HRT, and infiltration area. The application of infiltration facilities on areas with low permeability should comply with the guidelines presented in the Ministry of Environment's Standards for installation of non-point pollution reduction facilities. However, soil amendment may be necessary if the soil infiltration rate is less than 13 mm/hr.

고속도로는 많은 자동차 운행대수와 함께 높은 주행속도 및 급격한 주행속도 변화구간(휴게소, 영업소 등)으로 인하여 비점오염물질의 배출이 높은 지역에 해당한다. 국내 고속도로는 절토층 및 성토층에 조성됨으로써 적정 토양침투량 확보가 어려워 다양한 종류의 비점오염저감시설이 설치되지 못하고 있다. 본 연구는 토양치환 기법에 대한 연구를 통해 고속도로에 설치 가능한 시설의 종류를 확대하고 비용효율적 침투시설의 설계를 유도하기 위하여 수행되었다. 침투율이 낮은 원지반에 토양치환을 수행할 경우 시설 내 체류시간이 약 30% 지연되고, 시설 내 침투 및 저류율은 약 20% 증대하며, 비점오염물질 Total Suspend Soiled (TSS), Chemical Oxygen Demand (COD), Biological Oxygen Demand(BOD), Total Nitrogen(TN) 및 Total Phosphorus(TP) 제거효율이 약 20% 증가하는 것으로 나타났다. 원지반 내 침투율이 낮은 곳에 토양치환을 수행할 경우 저류량, 체류시간 및 침투면적이 증가하여 침투율이 향상되는 것으로 나타났다. 원지반 토양의 침투능이 낮은 토양에 침투시설을 적용하기 위해서는 물환경보전법 시행규칙 별표17(비점오염저감시설의 설치기준)의 개선이 필요하며, 이 경우 토양 침투율이 시간당 13 mm 이하일 때 토양치환을 통해 법적 처리용량을 확보하도록 요구할 수 있다.

Keywords

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