Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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The Effect of Carbon Dioxide Leaked from Geological Storage Site on Soil Fertility: A Study on Artificial Leakage

지중 저장지로부터 누출된 이산화탄소가 토양 비옥도에 미치는 영향: 인위 누출 연구

  • Baek, Seung Han (Department of Geology and Research Institute of Natural Science (RINS), Gyeongsang National University (GNU)) ;
  • Lee, Sang-Woo (Department of Geology and Research Institute of Natural Science (RINS), Gyeongsang National University (GNU)) ;
  • Lee, Woo-Chun (Department of Geology and Research Institute of Natural Science (RINS), Gyeongsang National University (GNU)) ;
  • Yun, Seong-Taek (Department of Earth and Environmental Sciences, Korea University) ;
  • Kim, Soon-Oh (Department of Geology and Research Institute of Natural Science (RINS), Gyeongsang National University (GNU))
  • 백승한 (경상국립대학교 지질과학과 및 기초과학연구소(RINS)) ;
  • 이상우 (경상국립대학교 지질과학과 및 기초과학연구소(RINS)) ;
  • 이우춘 (경상국립대학교 지질과학과 및 기초과학연구소(RINS)) ;
  • 윤성택 (고려대학교 지구환경과학과) ;
  • 김순오 (경상국립대학교 지질과학과 및 기초과학연구소(RINS))
  • Received : 2021.07.16
  • Accepted : 2021.08.20
  • Published : 2021.08.31
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Abstract

Carbon dioxide has been known to be a typical greenhouse gas causing global warming, and a number of efforts have been proposed to reduce its concentration in the atmosphere. Among them, carbon dioxide capture and storage (CCS) has been taken into great account to accomplish the target reduction of carbon dioxide. In order to commercialize the CCS, its safety should be secured. In particular, if the stored carbon dioxide is leaked in the arable land, serious problems could come up in terms of crop growth. This study was conducted to investigate the effect of carbon dioxide leaked from storage sites on soil fertility. The leakage of carbon dioxide was simulated using the facility of its artificial injection into soils in the laboratory. Several soil chemical properties, such as pH, cation exchange capacity, electrical conductivity, the concentrations of exchangeable cations, nitrogen (N) (total-N, nitrate-N, and ammonia-N), phosphorus (P) (total-P and available-P), sulfur (S) (total-S and available-S), available-boron (B), and the contents of soil organic matter, were monitored as indicators of soil fertility during the period of artificial injection of carbon dioxide. Two kinds of soils, such as non-cultivated and cultivated soils, were compared in the artificial injection tests, and the latter included maize- and soybean-cultivated soils. The non-cultivated soil (NCS) was sandy soil of 42.6% porosity, the maize-cultivated soil (MCS) and soybean-cultivated soil (SCS) were loamy sand having 46.8% and 48.0% of porosities, respectively. The artificial injection facility had six columns: one was for the control without carbon dioxide injection, and the other five columns were used for the injections tests. Total injection periods for NCS and MCS/SCS were 60 and 70 days, respectively, and artificial rainfall events were simulated using one pore volume after the 12-day injection for the NCS and the 14-day injection for the MCS/SCS. After each rainfall event, the soil fertility indicators were measured for soil and leachate solution, and they were compared before and after the injection of carbon dioxide. The results indicate that the residual concentrations of exchangeable cations, total-N, total-P, the content of soil organic matter, and electrical conductivity were not likely to be affected by the injection of carbon dioxide. However, the residual concentrations of nitrate-N, ammonia-N, available-P, available-S, and available-B tended to decrease after the carbon dioxide injection, indicating that soil fertility might be reduced. Meanwhile, soil pH did not seem to be influenced due to the buffering capacity of soils, but it is speculated that a long-term leakage of carbon dioxide might bring about soil acidification.

이산화탄소가 지구온난화를 초래하는 대표적인 온실가스로 지목되면서 대기 중의 이산화탄소 농도를 줄이기 위하여 많은 노력들이 진행되어 왔다. 그러한 노력들 중 특히 CO2 포집 및 지중 저장기술(carbon dioxide capture and storage, CCS)이 감축 목표량을 달성하기 위해서 필수적으로 고려되고 있다. 그러나 이러한 지중 저장기술이 상용화되기 위해서는 안전성이 보장되어야 한다. 특히 이산화탄소 누출이 농경지에서 발생할 경우에는 작물 생장과 관련되어 많은 문제를 야기할 수 있다. 이에 본 연구에서는 지중 저장지로부터 누출된 이산화탄소가 토양 비옥도에 미치는 영향에 대하여 고찰하였다. 이를 위하여 인위적인 이산화탄소 누출 시험을 수행하였으며, pH, 양이온치환용량, 교환성 양이온, 전기전도도, 토양 유기물 함량, 총 질소, 질산태 질소, 암모니아태 질소, 총 인, 유효태 인산, 총 황, 유효태 황, 유효태 붕소 등과 같은 토양의 화학적 특성들을 비옥도 지시 인자로 선정하였다. 누출 시험은 비경작지 토양 한 종류와 경작지 토양 두 종류(옥수수와 콩 재배)를 대상으로 이루어졌다. 비경작지 토양은 거친 모래가 많은 사질토양으로 공극률은 42.6%로 조사되었으며, 경작지 토양인 옥수수 재배 토양은 양질 사토(loamy sand)로 공극률이 46.8%이었다. 콩과식물(soybean) 재배 토양은 옥수수 재배 토양과 동일한 양질 사토로서 공극률이 48%로 조사되었다. 누출시험을 위해 6개의 인공누출 칼럼 장치를 이용하여 이산화탄소를 주입하였다. 이산화탄소 주입은 비경작지와 경작지 토양의 경우 각각 60일과 70일 동안 진행하였다. 이산화탄소 누출 후 비경작지 및 경작지 토양에 대하여 각각 12, 14일 간격으로 1 공극 부피의 인공강우 모사 시험을 수행한 후 용출액과 토양 시료를 채취하여 비옥도 지시 인자를 분석하였으며, 이산화탄소 누출 전후 변화 양상을 비교 평가하였다. 토양 내 잔류 교환성 양이온, 전기전도도, 토양 유기물 함량, 총질소, 총인 등은 이산화탄소의 영향을 크게 받지 않은 것으로 나타났다. 그러나 질산태 질소, 암모니아태 질소, 유효 인산, 유효 황, 유효 붕소 등은 감소하는 경향을 보였으며 이에 의해 토양 비옥도를 저하시킬 수 있을 것으로 판단된다. 본 연구에서는 토양의 완충능력 때문에 pH의 변화가 없었지만, 이산화탄소가 장기간 누출된다면 pH의 감소에 의한 토양 산성화가 초래될 가능성이 있을 것으로 예측된다.

Keywords

Acknowledgement

본 연구는 환경부의 재원으로 환경산업기술원의 이산화탄소 지중 저장 환경관리(K-COSEM) 연구단의 지원을 받아 수행되었습니다(과제번호: 2018001810001).

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