Land and Housing Review (토지주택연구)

Land and Housing Research Institute (한국토지주택공사 토지주택연구원)
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Amounts of Road-Deposited Sediments and Heavy Metals Contents for Different Antecedent Dry Days and Distance from a Rotary: Potential of Non-point Source Pollution Control

선행건기일수와 환상 교차로에서의 위치에 따른 도로퇴적물 축적량 및 중금속 함량: 비점오염 저감 활용 가능성

  • 김도군 (국립순천대학교 환경공학과 ) ;
  • 박상숙 (국립순천대학교 환경공학과)
  • Received : 2024.07.23
  • Accepted : 2024.09.04
  • Published : 2025.03.31
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Abstract

This study collected road-deposited sediments (RDS) at curved and straight sections on a motorway in a downtown area under varying antecedent dry days (ADD) conditions. The amounts and the contents of metals of the RDS were analyzed to investigate the effects of ADD and driving patterns on them. The quantity of RDS increased with increasing ADD regardless of section. It was more severe at the curve and reached 1136.9 g/m2 at an ADD of 35 days, 3.9 times that of straight sections. The contents of metals, enrichment factors (EF), and single pollution indices (PI) were highly variable and did not correlate with ADD or section. The contents of Al and Fe were as high as 72.5~107762.2 mg/kg, and those of Cr, Cu, Mn, Ni, and Zn were 162.4~4082.3 mg/kg. They were higher for larger particles (75~2,000 ㎛) than smaller ones. The EFs and PIs of Cr, Cu, Ni, Pb, and Zn were 40.9 and 122.6 at their maximum, respectively. The contents of Cr, Fe, Mn, Ni, Pb, and Zn showed strong correlations with each other in 75~2,000 ㎛ RDS, indicating that they originated from vehicles, i.e., tires, brakes, oils, fuels, and roads. However, those in <75 ㎛ RDS did not show substantial correlations. The results of this study suggest that the RDS is seriously polluted with metals. However, these also suggest a vital opportunity to decrease nonpoint source pollution via RDS removal.

본 연구에서는 도심지역의 회전구간과 직선구간에서 선행건기일수(antecedent dry days, ADD)에 따라 도로퇴적물(road deposited sediments, RDS)을 채취하여, ADD와 차량의 운행 특성에 따른 RDS 축적량과 금속 함량을 분석하였다. 전 구간에서 RDS 축적량은 ADD 증가에 따라 증가하였는데, 직선구간에 비해 회전구간에서의 증가폭이 더욱 컸다. ADD 35 day에서 회전구간에서의 축적량은 1136.9g/m2으로, 직선구간의 3.9배로 나타났다. RDS의 금속 함량, 농축계수(enrichment factors, EF), 그리고 단일오염지수(single pollution indices, PI)는 그 범위가 매우 넓었으며, ADD 또는 도로 위치와 상관관계를 나타내지 않았다. RDS의 Al과 Fe 함량은 172.5~107762.2mg/kg으로 Cr, Cu, Mn, Ni, 그리고 Zn(162.4~4082.3mg/kg)에 비해 높았으며, 이들은 큰 입자에서(75~2,000㎛) 더 높았다. Cr, Cu, Ni, Pb, 그리고 Zn의 EF와 PI 값은 각각 최대 40.9와 122.6이었다. 75~2,000㎛ RDS의 Cr, Fe, Mn, Ni, Pb, 그리고 Zn 함량은 상호 상관관계가 높아, 그 발생원이 타이어, 도로, 브레이크, 오일, 연료 등임을 나타내었다. 그러나, <75㎛ RDS의 금속 함량은 상관관계가 낮았다. 본 연구 결과는 대상지역의 RDS는 금속류에 심각하게 오염되어 있음을 나타낸다. 그러나, 이는 또한, RDS 제거의 의해 비점오염을 크게 저감할 수 있음을 의미한다.

Keywords

Acknowledgement

순천대학교 교연비 사업에 의하여 연구되었음.

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