생태와환경 (Korean Journal of Ecology and Environment)

  • 제45권2호
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  • Pages.218-231
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  • 2012
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  • 2288-1115(pISSN)
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  • 2288-1123(eISSN)
한국수생태학회 (The Korean Society of Limnology)
권호 표지

폐광산 지역의 유출수에 대한 이.화학적 수질특성 및 Enclosure 어류 노출시험 평가

Physico-chemical Characteristics and In situ Fish Enclosure Bioassays on Wastewater Outflow in Abandoned Mine Watershed

  • An, Kwang-Guk (Department of Biological Sciences, College of Bioscience and Biotechnology, Chungnam National University) ;
  • Bae, Dae-Yeul (Department of Biological Sciences, College of Bioscience and Biotechnology, Chungnam National University) ;
  • Han, Jeong-Ho (Department of Biological Sciences, College of Bioscience and Biotechnology, Chungnam National University)
  • 투고 : 2012.03.28
  • 심사 : 2012.05.30
  • 발행 : 2012.06.30
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초록

본 연구는 2005~2007년까지 3년에 걸쳐 폐광산 수계의 유출수에 의해 직접적으로 영향 받는 하천 및 대조군(Control, $C_o$) 하천에서 이 화학적 수질특성, 수질 내성도 및 트로픽 길드 특성, 다변수 생태모형(Multimetric Health Model)을 이용한 생태 건강도 평가 및 물리적 건강도 평가 모형(QHEI model)을 이용한 생물 서식지 평가를 실시하였다. 또한, 폐광산의 유출수에 대한 생태독성 평가를 위해 버들치(Rhynchocypris oxycephalus)를 이용하여 현장 Enclosure 노출시험(In situ Enclosure Bioassay)을 실시하였고, 해부학적 장기 조직의 평가지수 모형(Necropy-based Health Assessment Index, $N_b$-HAI)을 이용하여 대조군($C_o$)과 처리군(T)의 광산폐수의 영향을 평가하였다. 이들에 대한 장기 조직의 영향평가는 각 Enclosure에 10 개체씩 투입하여 지라(Spleen), 신장(Kidney), 아가미(Gill), 간(Liver), 눈(Eyes), 지느러미(Fins)의 조직분석(Tissue analysis)을 실시하였다. 대조군과의 비교평가에 따르면, 폐광산의 유출수는 하천수를 pH 3.2까지 떨어뜨려 강한 산성폐수와 유사한 특성을 보였고, 급격한 수소이온 증가 및 총용존물질(Total Dissolved Solid, TDS)의 증가를 가져왔다. 서식지 평가의 QHEI 모델 값은 지점별 유의한 차이(p>0.05)를 보이지 않은 반면, 다변수 생태모형(Multimetric Health Model)을 이용한 생태 건강도는 3년 동안 대조군($C_o$)에서 $M_m$-EH 모델 값은 16~20, 처리군($M_w$)에서는 0으로 폐광 유출수의 영향을 받는 지점에서는 "악화상태(P)"로 나타났다. 또한, Enclosure 노출평가 따르면, $N_b$-HAI 모델값은 3년 기간 동안 대조군에서 0~3으로 나타나 "최적~양호상태" (Ex~G)로 나타난 반면, 폐광 유출수의 Enclosure에 포함된 처리군(Treatment)에서 모델값은 모두 100 이상(범위: 100~137)을 상회하여 "악화상태(P)"로 평가되었으며, 크게 손상된 장기조직은 간(Liver), 신장(Kidney), 아가미(Gill)로 나타나 향후 폐광산 유출지역의 수질 및 생태관리가 시급한 것으로 사료되었다.

The objectives of this study were to evaluate the physico-chemical water quality, trophic and tolerance guilds in the control ($C_o$) and impacted streams of the abandoned mine, along with the ecological health, using a multimetric health model and physical habitat conditions of Qualitative Habitat Evaluation Index (QHEI), during the period of three years, 2005~2007. Also, eco-toxicity ($EE_t$) enclosure tests were conducted to examine the toxic effects on the outflows from the mine wastewater, using the sentinel species of Rhynchocypris oxycephalus, and we compared the biological responses of the control ($C_o$) and treatment (T) to the effluents through a Necropybased Health Assessment Index ($N_b$-HAI). Tissue impact analysis of the spleen, kidney, gill, liver, eyes, and fins were conducted in the controlled enclosure experiments (10 individuals). According to the comparisons of the control ($C_o$) vs. the treatment (T) in physicochemical water quality, outflows from the abandoned mine resulted in low pH of 3.2, strong acid wastewater, high ionic concentrations, based on an electrical conductivity, and high total dissolved solid (TDS). Physical habitat assessments, based on Qualitative Habitat Evaluation Index (QHEI) did not show any statistical differences (p>0.05) in the sampling sites, whereas, the $M_m$-EH model values in a multimetric ecological health ($M_m$-EH) model of the Index of Biological Integrity (IBI), using fish assemblages, were 16~20 (fair condition) in the control and all zero (0, poor condition) in the impacted sites of mine wastewater. In addition, in enclosure eco-toxicity ($EE_t$) tests, the model values of $N_b$-HAI ranged between 0 and 3 in the controls during the three years, indicating an excellent~good condition (Ex~G), and were >100 (range: 100~137) in the impacted sites, which indicates a poor condition (P). Under the circumstances, organ tissues, such as the liver, kidney, and gills were largely impaired, so that efficient water quality managements are required in the outflow area of the abandoned mine watershed.

키워드

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