Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Performance Evaluation of a Double Layer Biofilter System to Control Urban Road Runoff (I) - System Design -

이중층 토양 여과시설을 이용한 도로 강우 유출수 처리성능 평가 (I) - 시설 설계인자 결정을 중심으로 -

  • 조강우 (한국과학기술연구원 환경기술연구단) ;
  • 김태균 (한국과학기술연구원 환경기술연구단) ;
  • 이병하 (한국과학기술연구원 환경기술연구단) ;
  • 이슬비 (이화여자대학교 환경공학과) ;
  • 송경근 (한국과학기술연구원 환경기술연구단) ;
  • 안규홍 (한국과학기술연구원 환경기술연구단)
  • Received : 2009.09.10
  • Accepted : 2009.10.05
  • Published : 2009.10.15
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Abstract

This manuscript covers the results of field investigation and lab-scale experiments to design a double-layered biofilter system to control urban storm runoff. The biofilter system consisted of a coarse soil layer (CSL) for filtration and fine soil layer (FSL) for adsorption and biological degradation. The variations of flow rate and water quality of runoff from a local expressway were monitored for seven storm events. Laboratory column experiments were performed using seven kinds of soil and mulch to maximize pollutants removal. The site mean concentration (SMC) of storm runoff from the drainage area (runoff coefficient: 0.92) was measured to be 203 mg/L for SS, 307 mg/L for $TCOD_{Cr}$, 12.3 mg/L for TN, 7.3 mg/L for ${NH_4}^+-N$, and 0.79 mg/L for TP, respectively. This study employed a new design concept, to cover the maximum rainfall intensity with one month recurrence interval. Effective storms for last ten years (1998-2007) in seoul suggested the design rainfull intensity to be 8.8 mm/hr Single layer soil column showed the maximum removal rate of pollutants load when the uniformity coefficient of CSL was 1.58 and the silt/clay contents of FSL was virtually 7%. The removal efficiency during operation of double layer soil column was 98% for SS and turbidity, 75% for TCODCr, 56% for ${NH_4}^+-N$, 87% for TP, and 73-91% for heavy metals. The hydraulic conductivity of the soil column, 0.023 cm/sec, suggested that the surface area of the biofilter system should be about 1% of the drainage area to treat the rainfall intensity of one month recurrence interval.

Keywords

Acknowledgement

Supported by : 한국과학기술연구원(KIST)

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