[논문]Degmay 우라늄광산 폐기물 부지 복원을 위한 복토층 개념설계

바이시딘 사이도프; 데이빗 케슬; 김창락

doi:10.7733/jnfcwt.2016.14.2.189

초록
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타지키스탄공화국에는 10군데의 우라늄광산 부지에 55백만톤의 우라늄광산 폐기물이 적치 되어 있는데 부지 면적이 200 핵 타아르에 달한다. 이에 따라 우라늄 폐광과 폐기물의 안전한 관리가 주요 이슈로 부각되고 있다. 부지 복원을 위한 천연방벽과 인공방벽으로 구성된 다중 복토층은 성능 목표와 부지 조건을 고려하여 설치되어야 한다. 본 논문의 목적은 Degmay 부지에 장기간 (100년 이상)의 환경보호를 제공할 수 있는 경제적인 다중 복토층 개념을 제시 하는 것이다. HELP 코드를 사용하여 Degmay 부지의 복토층 설계 개념의 평가를 수행하였다. 그 결과 70 cm의 덮개층, 30 cm의 배수층, 지오멤브레인 라이너 그리고 60 cm의 토양 방벽층으로 구성된 복토층 개념이 두께를 최소화 할 수 있고 비교된 여러 설계개념 중 가장 경제적인 설계 안으로 제시되었다.

Abstract ▼ AI-Helper

The Republic of Tajikistan has ten former uranium mining sites. The total volume of all tailings is approximately 55 million tonnes, and the covered area is more than 200 hectares. The safe management of legacy uranium mining and tailing sites has become an issue of concern. Depending on the perform...

The Republic of Tajikistan has ten former uranium mining sites. The total volume of all tailings is approximately 55 million tonnes, and the covered area is more than 200 hectares. The safe management of legacy uranium mining and tailing sites has become an issue of concern. Depending on the performance requirements and site-specific conditions (location in an arid, semiarid or humid region), a cover system for uranium tailings sites could be constructed using several material layers using both natural and man-made materials. The purpose of this study is to find a feasible cost-effective cover system design for the Degmay uranium tailings site which could provide a long period (100 years) of protection. The HELP computer code was used in the evaluation of potential Degmay cover system designs. As a result of this study, a cover system with 70 cm thick percolation layer, 30 cm thick drainage layer, geomembrane liner and 60 cm thick barrier soil layer is recommended because it minimizes cover thickness and would be the most cost-effective design.

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문제 정의

It evaluates the ability of several cover system designs to provide high performance for long period of time with minimum water infiltration through the cover layers. The objective is to reduce migration of radionuclides and reduce negative impact from uranium tailings site to the environment and public health.
The objectives of this study are to identify a feasible cover system design for Degmay uranium tailings site. The performance of several cover systems to be built using native loam and soil around Degmay site is modeled using the US EPA HELP (Hydrologic Evaluation of Landfill Performance) model [5].
Tajikistan is responsible for the safe management and remediation of many sites affected by the operation of uranium mining and milling facilities. This study focused on one of the many sites affected by the legacy of Soviet uranium mining and milling operations.

제안 방법

All three cover system designs were evaluated for performance with changing thicknesses of vertical percolation layer. The summary results of the simulation given in Table 7.
This study concentrates on evaluating the feasibility of a cover system design for the Degmay uranium tailings site based on performance and indirectly, cost. It evaluates the ability of several cover system designs to provide high performance for long period of time with minimum water infiltration through the cover layers. The objective is to reduce migration of radionuclides and reduce negative impact from uranium tailings site to the environment and public health.
The cover system of uranium tailings sites could be constructed using several material layers which is called a multilayer cover system. The purpose of this work was to find a feasible cost-effective cover system design for the Degmay uranium tailings site, which could provide long period (100 years) of protection.
This study concentrates on evaluating the feasibility of a cover system design for the Degmay uranium tailings site based on performance and indirectly, cost.

대상 데이터

Degmay tailings disposal was carried out for 30 years from 1963 to 1993. The Degmay site is located 1.5 kilometres from Guisyon village on the Degmay hill. The area of Degmay uranium tailing site is 90 ha and the total amount of uranium residue wastes are 20 million tonnes, about 500,000 tonnes of sub-economic uranium ores and 5.
These resulted from the uranium mining and the processing of uranium ore into yellow cake at on site milling facilities. The location of these facilities is close to Khudjand city and other populated areas.

이론/모형

The HELP computer code was used for evaluation of Degmay cover system designs. From obtained simulation results of three main designs A, B, C and their series (A1- A3, B1-B3, C1-C3) it is clear that the designs which do not have a drainage system and a geomembrane layer cannot provide good performance even when the total height of cover system is 2 m (designs A3 and C3).
The objectives of this study are to identify a feasible cover system design for Degmay uranium tailings site. The performance of several cover systems to be built using native loam and soil around Degmay site is modeled using the US EPA HELP (Hydrologic Evaluation of Landfill Performance) model [5].

참고문헌 (5)

International Atomic Energy Agency. Safe Management of Residues from Former Mining and Milling Activities in Central Asia, IAEA Report (2009).
N. Khakimov, K.M. Nazarov, and I.U. Mirsaidov, Physico-Chemical and Manufacturing Basis for Uranium Concentrates Production from Wastes of Hydrometallurigical Plants and Technical Waters, 2nd ed., Dushanbe (2012).
International Atomic Energy Agency. Assessment and Proposals for Uranium Production Legacy Sites in Central Asia: An International Approach, IAEA Report (2010).
International Atomic Energy Agency. The Long Term Stabilization of Uranium Mill Tailings, IAEA Report, IAEA-TECDOC-1403 (2004).
P.R. Schroeder, T.S. Dozier, P.A. Zappi, B.M. McEnroe, J.W. Sjostrom, and R.L. Peyton. The Hydrologic Evaluation of Landfill Performance (HELP) Model: Engineering Documentation for Version 3, U.S. Environmental Protection Agency Report, EPA/600/R-94/168b (1994).

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[국내논문] Degmay 우라늄광산 폐기물 부지 복원을 위한 복토층 개념설계
Conceptual Design of a Cover System for the Degmay Uranium Tailings Site 원문보기

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[국내논문] Degmay 우라늄광산 폐기물 부지 복원을 위한 복토층 개념설계 Conceptual Design of a Cover System for the Degmay Uranium Tailings Site 원문보기

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[국내논문] Degmay 우라늄광산 폐기물 부지 복원을 위한 복토층 개념설계
Conceptual Design of a Cover System for the Degmay Uranium Tailings Site 원문보기

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