• 상하수도학회지
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• 제25권1호
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• pp.1-5
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• 2011

Arsenic is one of the most abundant contaminant found in waste mine tailings and soil around refinery, Because of its carcinogenic property, the countries like United States of America and Europe have made stringent regulations which govern the concentration of arsenic in soil. The study focuses on solidification/stabilization for removal of arsenic from soil. Cement was used to solidify/stabilize the abandoned soil primarily contaminated with arsenic (up to 68.92 mg/kg) in and around refinery. Solidified/stabilized (s/s) forms in the range of cement contents 5-30 wt % were evaluated to determine the optimal binder content. Revised Korean standard leaching tests (KSLT), toxicity characteristic leaching procedures (TCLP), Old Korea standard leaching test and revised Korea standard leaching test were used for chemical characterization of the S/S forms. The addition of 10 % cement remarkably reduced the leachability of arsenic in contaminated soil. The concentration of As in leachate of TCLP, KSLT, and old KSLT for soil are below the standard. However that in leachate of revised KSLT is above the standard. Because of extraction fluid used in revised KSLT is very strong acid. It is arsenic in s/s with binder should be exhaustingly leached. Therefore S/S process would not be available for As treatment in soil in Korea.

• 한국지하수토양환경학회지:지하수토양환경
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• 제29권1호
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• pp.72-83
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• 2024

Most of the slags generated from steel-making industry in Korea are recycled into media-contact aggregates such as fill and cover materials. For their use as media-contact aggregates, the slags must meet not only the waste quality criteria, but also the Daphnia magna acute toxicity test criteria. In this study, Korean Leaching Test ES 06150.e (Korea), Japanese Leaching Test JIS K 0058-1(Japan), Detuch Leaching Test DIN 19529 (Germany), Toxicity Characteristic Leaching Procedure (USA) were conducted for batch leaching test of slags from 6 Korean steel-making companies. In addition, Korean Standard up-flow percolation test (ES 06151.1) mimicking field conditions was conducted to assess the impact of the slag leachate on the surrounding environment indirectly. Heavy metals such as Cr⁶⁺ and Zn²⁺ were detected from both extractant and leachate samples, but all of them did not exceed waste quality criteria of each country. However, Daphnia magna acute toxicity tests using the leachate samples from up-flow percolation test with slag alone and slag/natural soil conditions exceeded ecotoxicity standard (TU=2) due to their high pH (11.3-12.5). After neutralizing the pH of the slag leachate to 6.5~8.5, the Daphnia magna mortality and immobilization were reduced to satisfy ecotoxicity standard. As the reducing pH of slag leachate would be extremely difficult, appropriate recycling management considering the physicochemical characteristics of he slags should be stuided further.

• 분석과학
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• 제11권5호
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• pp.394-399
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• 1998

석탄 화력발전소의 비산회를 재활용하여 산업원료로 유효하게 활용하기 위한 조사로 이에 대한 물리화학적 분석외에 용출시험을 시행하였다. 비산석탄회에 함유된 유해 중금속의 용출시험시 용매에 의한 영향과 방해물질의 작용 등을 고려하여, 용출시험은 국내 폐기물 공정시험법에 따른 방법과 미국 환경청의 EPA Method 1311(TCLP)법을 비교 실험하였으며, 용출액은 EPA Method 3050B를 이용하여 전처리 한 후, ICP-MS를 사용하여 9종의 중금속(Ag, As, Ba, Cd, Cr, Cu, Pb, Se, Hg)을 분석하였다. 용출시험의 결과는 Se 경우를 제외한 모든 금속에서 TCLP법에 의한 용출 농도가 1.2~5배로 높게 나타났다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제15권3호
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• pp.52-60
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• 2010

The stone-dust is an unavoidable by-product of aggregate production, which is produced about 0.8~1.0 million $m^3$ annually. The stone-dust is currently regarded as a hazard material on environment because it is classified as an industrial waste in the Waste Management Law of Korea. At present, the stone-dust is considered as a environmentally hazardous material, and is classified as an industrial waste according to the Waste Management Law of Korea. In this study, we assessed the heavy-metal contamination of the stone-dust on surrounding environments by various leaching tests. Leaching experiments (such as Korea Standard Leaching Procedure (KSLP), Soil Environment Preservation Act of Korea (SEPAK), Toxicity Characteristic Leaching Procedure (TCLP), and Synthetic Precipitation Leaching Procedure (SPLP)) show that very low heavy metals (As, Cd, Cu, Pb, Zn, Hg) and CN are leached out, or much less than each regulatory thresholds. The resuts of the leaching test with time in acidic solution (initial pH 5 and 3) indicate that pH-buffering minerals are present in the stone-dust. These results suggest that the stone-dust can not potentially affect adverse impact on surrounding environments such as surface water, groundwater and soil etc..

• 방사성폐기물학회지
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• 제1권1호
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• pp.93-103
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• 2003

IAEA, FT-04-020 및 ANS 16.1의 침출시험법을 각각 수행하여 얻은 시험결과를 이용하여 상호 비교 평가하였다. 붕산을 함유한 파라핀 및 시멘트 고화체에서의 $^{60}$Co 과 $^{137}$Cs의 ANS 16.1의 침출지수는 6이상이었으나 고화매질과 탈염수의 종류에 따라 상반되는 침출거동을 보였다. 침출수로 합성해수와 탈염수를 사용하였을 경우 $^{60}$Co는 시멘트 고화체에서는 합성해수, 파라핀 고화체에서는 탈염수에서 침출이 높았다. 반면에 $^{137}$Cs의 침출정도는 시멘트에서는 탈염수, 파라핀에서는 합성해수에서 높았다. $^{60}$Co의 침출분율은 시멘트 고화체에서 IAEA ＞ ANS ＞ FT의 순으로 높았으며, 반대로 파라핀고화체에서는 이의 역순이었다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제6권1호
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• pp.23-31
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• 2001

용융처리는 중금속을 안정화시키는 효과적인 방법의 하나이며, 또한 고가의 부산물을 생산해낸다. 본 연구에서는 소각재를 용융하여 얻은 슬래그의 중금속 용출특성을 평가하고자 한다. 슬래그를 재활용하는데 있어서 환경적인 적합성을 평가하기 위하여 소각재, 슬래그 및 슬래그를 재활용재로 하여 제조한 건설재료에 대한 용출시험을 수행하였다. 시험결과는 다음과 같다. (1) 국내표준용출시험법(KSLT)에 의해 시험한 슬래그의 중금속 용출농도는 소각재의 용출농도보다 낮은 값을 나타냈다. (2) 장기용출시험법에 의해 평가한 슬래그의 중금속 용출농도도 KSLT의 기준을 만족했다. (3) 슬래그의 건설재료로서의 사용성을 평가하기 위해 만든 모르타르 공시체의 용출결과, 슬래그를 재활용재로서 사용하는데 있어서 중금속 용출 측면에서 적합하다고 사료된다. (4) 독일의 소각재 재활용을 위한 가이드라인인 RG Min-StB 93, FGSV에서 제시하는 방법에 의해 시험한 결과, 본 슬래그의 용출농도는 독일의 규제기준을 만족하였다.

• 환경영향평가
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• 제22권5호
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• pp.427-437
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• 2013

Generation rate of construction wastes in Korea has occupied preponderantly in recent years. To understand chemical properties of recycled concrete aggregate (RCA), RCA samples were tested for their leaching characteristics. Leaching tests were conducted according to Korean Standard Leaching Test (KLT) and Toxicity Characteristics Leaching Procedure (TCLP) respectively. The RCA samples were characterized using X-ray fluorescence (XRF). Alkalinity of the leachate was determined using a pH meter titration method. The XRF analysis result shows that the calcium oxide (CaO) content in the RCA sample is 25.3~50.4 %. When the RCA sample was mixed with water in a batch reactor, pH in the solution was rapidly increased, and 70% of the total pH change was found in 1 hour. The TCLP showed slightly higher efficiency for leaching heavy metals than the KLT. The leaching efficiency was also higher as the particle size of RCA sample was smaller. The leaching test results suggest that RCA can be generally classified as nonhazardous waste.

• 한국지반환경공학회 논문집
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• 제11권6호
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• pp.77-83
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• 2010

본 연구에서는 화력발전소에서 발생한 바텀애쉬를 성토재로 사용하기 전 환경에 미치는 영향을 평가하고자 하였다. 바텀애쉬에 대한 기본 물성치는 공업분석, 원소분석, XRD, XRF를 통해 구하였고, 폐기물 용출실험, 토양오염 공정실험을 통해 바텀애쉬에 대한 폐기물 분류 및 토양오염 가능성을 평가하였다. 위 용출실험 결과는 국내 수질환경기준 및 지하수 수질기준과 비교하였고 수질오염의 가능성은 없는 것으로 평가되었다. 측정된 대부분의 중금속은 검출한도 이하였으며 $Cr^{6+}$의 경우 미량이 검출되었으나 기준치 이하였다. 컬럼실험에서는 Pb, Zn 및 황산염이 기준치를 초과하였으나, Pb과 Zn은 1 PVE 전에 모두 기준치 이하로 감소하였고 황산염은 기준치 이하로 감소하는데 최대 8 PVE의 시간이 소요되었다. 중금속의 경우 대부분이 기준치 이하이므로 문제가 없으나 황산염은 기준치를 10배 정도 초과하므로 사용에 주의를 요한다.

• 한국결정성장학회지
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• 제19권3호
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• pp.135-143
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• 2009

$Cr^{6+}$의 고용화 가능성과 lignin계 혼화제의 성능을 조사하기 위하여 과잉의 $Cr^{6+}$을 첨가하여 KSLI, 미국 TCLP법, Soaking Procedure를 이용하여 각 기준에 따른 용출 특성을 조사하였다. 그 결과 lignin계 혼화제는 첨가에 따라 모르타르 강도 증진을 보였으며 용출 특성에 큰 변화는 없었다.

• 연구논문집
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• 통권31호
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• pp.5-14
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• 2001

These days, interest in the leaching of hazardous heavy metals to consist of incinerator fly ash is increasing, because the heavy metals that leach from the incinerator fly ash pollute the soil and ground water. Therefore this study was undertaken to crystallize the fly ash and prevent the leaching of hazardous heavy metals from fly ash. The concentrations and the leaching concentration of hazardous heavy metals(Cd, Cr, Hg, Pb, Zn) in the law incinerator fly ash have been measured. The fly ash was melted with two kinds of flux($Na_2CO_3, CaCO_3$) and its add quantity(0, 1, 2, 3 wt%). The crystal structure of melting materials was analyzed by SEM(Scaning Electron Microscope) and X-RD(X-Ray Diffractometer). The leaching test of melting materials was undertaken. And the relation between crystallization of melting materials and flux and leaching concentration. These experiments indicate that the concentration and leaching concentration of heavy metals in incinerator fly ash was much higher than the regulatory standard for leachates in Korea and U.S.A and average concentration of heavy metals in soil. And the crystal structure was better.