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| Capping 기술을 이용한 하천 및 호소 퇴적토의 인 용출 저감 효과분석 |
| 김석구, 윤상린 |
| 한국건설기술연구원 환경연구실 |
| Analysis on the Reduction of Phosphorus Release in River and Lake Sediments through Application of Capping Technology |
| Seog-ku Kim, Sang-leen Yun |
| Korea Institute of Civil Engineering and Building Technology, Environmental Engineering Research Division |
| Corresponding author |
Sang-leen Yun ,Tel: 031-910-0316, Fax: 031-910-0291, Email: leeno@kict.re.kr
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Received: November 11, 2014; Revised: November 17, 2014; Published online: November 30, 2014. |
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| ABSTRACT |
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Contaminants such as organic matters, nutrients and toxic chemicals in rivers and lakes with a weak flow rate are first
removed from the water and accumulated in the sediments. Subsequently, they are released into the water column again, posing
direct/indirect adverse effects on the water quality and aquatic ecosystems. In particular, phosphorus is known to accelerate the
eutrophication phenomenon when it is released into the water column via physical disturbance and biological/chemical actions as
one of important materials that determine the primary production of aquatic ecosystems and an element that is stored mainly in the
sediments in the process of material circulation in the body of water. In this study, the effect on reducing phosphorus release in
sediments was analyzed by applying different capping materials to lake water, where the effect of aquatic microorganisms is taken
into account, and to distilled water, where the effect of microorganisms is excluded. The experimental results showed that capping
with chemical materials such as Fe-gypsum and SiO2-gypsum further reduced the phosphorus release by at least 40% compared
to the control case. Composite materials like granule gypsum+Sand showed over 50% phosphorus release reduction effect. Therefore,
it is determined that capping with chemical materials such as granule-gypsum and eco-friendly materials such as sand is effective
in reducing phosphorus release. The changes in phosphorus properties in the sediments before and after capping treatment showed
that gypsum input helped to change the phosphorus that is present in lake sediments into apatite-P, a stable form that makes phosphorus
release difficult. Based on the above results, it is expected that the application of capping technology will contribute to improving
the efficiency of reducing phosphorus release that occurs in river and lake sediments. |
| Key Words:
Rivers, Lakes, Sediments, Phosphorus Release, Capping Technology, Internal Loading |
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