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도심하천 퇴적물의 이화학적 특성과 영양염 용출

Physicochemical Characteristics and Nutrient Release from Sediment in an Urban Stream

  • 김태훈 (경희대학교 환경응용과학과) ;
  • 정재훈 (경희대학교 환경응용과학과) ;
  • 최선화 (한국농어촌공사 농어촌연구원) ;
  • 최이송 (경희대학교 환경학 및 환경공학과, 환경연구센터) ;
  • 오종민 (경희대학교 환경학 및 환경공학과, 환경연구센터)
  • Kim, Tae Hoon (Department of Environmental Application Science, Kyung Hee University) ;
  • Jung, Jae Hoon (Department of Environmental Application Science, Kyung Hee University) ;
  • Choi, Sun Hwa (Rural Research Institute, Korea Rural Community Corporation) ;
  • Choi, I Song (Center for Environmental Studies, Department of Environmental Science and Engineering, Kyung Hee University) ;
  • Oh, Jong Min (Center for Environmental Studies, Department of Environmental Science and Engineering, Kyung Hee University)
  • 투고 : 2015.03.04
  • 심사 : 2015.03.20
  • 발행 : 2015.06.30

초록

본 연구대상지인 굴포천은 인천, 부천, 서울, 김포를 걸쳐 흐르는 도심하천으로서 수질오염이 심하고 지속적인 하천개수사업으로 인하여 하천의 자연성이 미비한 실정이다. 본 연구에서는 굴포천에서 하천수 및 하상 퇴적물의 이화학적 특성을 분석하였고, 퇴적물로부터 영양염 용출특성을 실내실험으로 호기와 혐기 조건에서 규명하고자 하였다. 굴포천의 수질은 영양염의 농도가 높을 뿐만 아니라 용존산소가 매우 낮아서 혐기화로 인한 다양한 수질문제를 야기할 우려가 있었다. 또한, 완만한 경사 및 느린 유속으로 인하여 유수가 정체되어 있기에 하상 내에 퇴적 오니가 쌓이게 되고, 이러한 퇴적오니는 다량의 유기물질과 영양염이 흡착하고 있어 재용출에 의한 내부오염의 가능성이 높았다. 결론적으로 굴포천 퇴적물은 혐기조건에서 오염물질이 용출될 가능성이 크고, 이로 인하여 하천 수질에 악영향을 미칠 수 있기에 준설 등의 주기적인 퇴적물 관리가 필요하다.

The water quality of the Gulpo Stream flowing through Incheon, Bucheon, Seoul, and Kimpo is getting worse due to a slow flow rate and bank constructions by stream channelization as well as an inflow of pollutants from living-sewages and factory-sewages. Besides, a dry stream phenomenon caused by a lack of maintenance water upstream makes a self-purification system worse, and the water quality of the Gulpo Stream is currently at its lowest level. The accumulated sludge of the streambed is mostly formed by the deposition of particle pollutants due to the slow flow rate and an artificially straightened stream channel. This accumulated sludge adsorbs a great quantity of organic materials and heavy metals. Because of the internal contamination possibility by a re-gushing, even after the pollution source is removed, it can cause future water pollution. Without a total examination as previously recommended, it is considered difficult to accomplish practical efficiency. In conclusion, the management of periodic sediment management such as dredging would be necessary in the Gulpo Stream because sediment could be an internal pollution source of stream water under anaerobic conditions.

키워드

참고문헌

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피인용 문헌

  1. Differences in Biogeochemical Properties and Microbial Activities in Stream Segments with Changes in Land-use Type vol.2, pp.3, 2015, https://doi.org/10.17820/eri.2015.2.3.247
  2. Evaluation of the tributaries by influence index on the mid-lower portion of the Nakdong River basin vol.23, pp.2, 2017, https://doi.org/10.4491/eer.2017.067