시멘트계 합성물질을 이용한 비소 오염 토양의 고형화/안정화

국문 초록 (Abstract)

본 연구에서는 비소 오염 토양의 비소 처리를 위해 고형화/안정화 공법을 적용하였으며, 4가지 종류의 바인더(시멘트, 영가철(Zero Valent iron, ZVI), monosulfate와 ettringite(시멘트계 합성물질))를 이용하였다. 1 N HCl 용출법을 통해 비교한 결과 바인더 함유량 20%에서, 시멘트(71.41%) > monosulfate(47.45%) > ettringite(46.36%) > 영가철(33.08%)의 비소가 용출되었다. 또한, 시멘트에 첨가제(monosulfate, ettringite, calcium sulfoaluminate, CSA)를 혼합하여 바인더를 제작하여 비소 저감 능력을 평가하였다. 1NHCl 용출법을 통해 비교한 결과 3가지 혼합바인더 모두 혼합비 4:1에서 최대의 비소농도 저감효과를 나타냈으며, CSA(86.27%) > monosulfate(84.78%) > ettringite(84.71%) > 시멘트(71.41%)의 비소를 안정화하여 기존의 시멘트만 단독으로 사용했을 경우보다 더 높은 비소(As(V)) 저감 능력을 가지고 있는 것으로 평가된다.

다국어 초록 (Multilingual Abstract)

Solidification/Stabilization(S/S) is one of the remediation technologies that have been applied for treating inorganic hazardous wastes. This study investigated the reduction of arsenic concentration of arsenic-contaminated soil using by S/S. The binder plays a role in controlling the mobility and solubility of the contaminants in S/S process, so it is important to determine the optimum binder content. Therefore, this study evaluated the effectiveness of S/S using four different binders(cement, zero valent iron, and monosulfate and ettringite(cement-based synthesized materials) at the binder content ranged between 5%(wt.) and 20%(wt.). The leachability of arsenic in 1 N HCl was different depending on the types of binders: cement(71.41%) > monosulfate(47.45%) > ettringite(46.36%) > ZVI(33.08%) at the binder content of 20%. Additionally, three kinds of a mixture binder were prepared using cement and additives(monosulfate, ettringite, calcium sulfoaluminate(CSA)) and tested for arsenic reduction. The highest arsenic removal capacity was found at the mass ratio of cement to the additive, 4:1 in all experiments using a mixture binder, regardless of the additives types. A mixture binder(cement and additives) resulted in higher arsenic removal relative to the arsenic removal when cement was used alone.

목차 (Table of Contents)

• ABSTRACT
• 요지
• 1. 서론
• 2. 연구방법
• 3. 실험결과 및 고찰
• 4. 결론
• 감사의 글
• 참고문헌

참고문헌 (Reference)

1 김은이, "폐광산 비소 오염 토양의 특성 및 고형화/안정화" 한국폐기물자원순환학회 22 (22): 363-371, 2005

2 환경부, "토양오염우려기준, 토양환경보전법"

3 환경부, "토양오염대책기준, 토양환경보전법"

4 유경열, "영가철 (Zerovalent Iron)을 이용한 수용액 중 비소(V)의 불용화" 한국환경농학회 26 (26): 197-203, 2007

5 Sun, H., "Treatment of Groundwater Polluted by Arsenic Compounds by Zero Valent Iron" 129 (129): 297-303, 2006

6 Miller, J., "Treatment of Arsenic-Contaminated Soils. II: Treatability Study and Remediation" 126 (126): 1004-1012, 2000

7 Leist, M., "The Fixation and Leaching of Cement Stabilized Arsenic" 23 (23): 353-359, 2003

8 Glasser, F. P., "Stability and Solubility Relationships in AFm Phases: Part I. Chloride, Sulfate and Hydroxide" 29 (29): 861-866, 1999

9 Vandecasteele, C., "Solidification/Stabilisation of Arsenic Bearing Fly Ash From the Metallurgical Industry. Immobilisation Mechanism of Arsenic" 22 (22): 143-146, 2002

10 Matheson, L. J., "Reductive Dehalogenation of Chlorinated Methanes by Iron Metal" 28 (28): 2045-2053, 1994

11 Alowitz, M. J., "Kinetics of Nitrate, Nitrite and Cr(VI) Reduction by Iron Metal" 36 (36): 299-306, 2002

12 Plank, J., "Impact of Zeta Potential of Early Cement Hydration Phases on Superplasticizer Adsorption" 37 (37): 537-542, 2007

13 Chen, Q. Y., "Immobilisation of Heavy Metal in Cement-based Solidification/Stabilisation: A Review" 29 (29): 390-403, 2009

14 Smedley, P. L., "Hydrogeochemistry of Arsenic and Other Inorganic Constituents in Groundwaters from La Pampa, Argentina" 17 (17): 259-284, 2002

15 Alloway, B. J., "Heavy Metals in Soil, Second Edition" Blackie Academic and Professional 105-119, 1994

16 Gastaldi, D., "Ettringite and Calcium Sulfoaluminate Cement: Investigation of Water Content by Near-infrared Spectroscopy" 44 (44): 5788-5794, 2009

17 Baur, I., "Dissolution-precipiation Behaviour of Ettringite, Monosulfate, and Calcium Silicate Hydrate" 34 (34): 341-348, 2004

18 최원호, "Cement based solidification/stabilization of arsenic-contaminated mine tailings" PERGAMON-ELSEVIER SCIENCE LTD 29 (29): 1766-1771, 200905

19 Mohan, D., "Arsenic Removal from Water/wastewater using Adsorbents－A Critical Review" 142 (142): 1-53, 2007

20 Rozman, K. K., "Absorption, Distribution, and Excretion of Toxicants" McGraw-Hil 107-132, 2003

21 Phenrat, T., "A SEM and X-ray Study for Investigation of Solidified/Stabilized Arsenic–Iron Hydroxide Sludge" 118 (118): 185-195, 2005

22 Conner, J. R., "A Critical Review of Stabilization/Solidification Technology" 28 (28): 397-462, 1998

23 환경부, "09.2월 시멘트 중 6가크롬 및 중금속 함량 조사결과"