• Environmental Engineering Research
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• 제23권2호
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• pp.189-194
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• 2018

The traditional gold mining in Kulon Progo district, Special Region of Yogyakarta Province produced tailings containing mercury (Hg) from the gold amalgamation process. Mercury accumulated in tailings has 164.19 mg/kg - 383.21 mg/kg in total concentration. Stabilization/solidification (S/S) is one of the remediation technologies to reduce waste pollution. Portland cement is one of the additive materials in S/S that effective encapsulates heavy metal waste. The aim of this research is to know the optimum composition of tailings mixture with Portland cement in S/S process. This research used variation of tailings composition. Variation of Portland cement composition with tailing are 100:0, 90:10, 80:20, 70:30, 60:40, 50:50, 40:60, 30:70, 20:80 and 10:90. The result of this study found that the optimum composition of Portland cement: tailings was 10:90, with compression test of $257ton/m^2$ and TCLP test was 0.0069 mg/L. The compression test results were in accordance to US EPA Standard quality of $35ton/m^2$. TCLP test results meet the standard of Indonesian Government Regulation No. 101 Year 2014 of 0.05 mg/L.

• Advances in environmental research
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• 제3권4호
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• pp.337-353
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• 2014

The determination of the effectiveness of the immobilization of blasting dust (waste generated in galvanic activities) in cement matrix, as well of mechanical, physical and microstructural properties of concrete paving blocks produced with partial replacement of cement was the objective of this work. The results showed that blasting dust has high percentage of silica in the composition and very fine particle size, characteristics that qualify it for replacement of cement in manufacturing concrete blocks. The replacement of Portland cement by up to 5% residues did not cause a significant loss in compressive strength nor increase in water absorption of the blocks. Chemical tests indicated that there is no problem of leaching or solubilization of contaminants to the environment during the useful life of the concrete blocks, since the solidification/stabilization process led to the immobilization of waste in the cement mass. Therefore, the use of blasting dust in the manufacture of concrete paving blocks is promising, thus being not only an alternative for proper disposal of such waste as well as a possibility of saving raw materials used in the construction industry.

• 한국물환경학회지
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• 제27권6호
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• pp.862-867
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• 2011

Pozzolanic-based stabilization/solidification (S/S) is an effective and economic remediation technology to immobilize heavy metals in contaminated soils. In this study, quick lime (CaO) was used to immobilize cadmium and zinc present in waste mine contaminated clayey sand soils. Addition of 5% quicklime to the contaminated soils effectively reduced heavy metal leachability after 2 bed volume operation below the drinking water regulatory limits. Lime addition was revealed to increase the immobilization for all heavy metals in tested pH ranges, so it could be an optimal choice for short-term remediation of heavy metal contaminated soil. The mass balances for these column tests show metal reduction of 92% for Cd and 87% for Zn of total resolved mass in case of 5% lime application.

• 대한환경공학회지
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• 제30권10호
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• pp.1034-1038
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• 2008

분해성 고형화/안정화(DS/S, degradative solidification/stabilization)는 전통적인 고형화/안정화(S/S, Solidification/Stabilization)에 경제성과 유기 오염물질의 분해를 추가한 기술이다. 무기 오염물질은 고정되며 유기 오염물질은 DS/S시스템에 의해 분해된다. 본 연구에서는 액상폐기물 내의 클로로포름(CF)과 메틸렌클로라이드(MC) 분해를 위해 cement/slag/Fe(II)시스템을 바인더로 한 DS/S의 효율성을 평가 하였다. 초기 CF의 농도는 0.26 mM, 1.0 mM, 8.4 mM, 25 mM and 42 mM 그리고 Fe(II) 농도는 200 mM로 하였다. 실험결과 다양한 농도의 CF의 분해경향은 유사일차반응으로 표현할 수 있었으며 초기농도 0.26 mM에서 5일 이내에 95%가 분해되었다. MC의 분해를 촉진시키기 위하여 중금속 50 mg/L을 추가하였으나 분해는 거의 이루어지지 않았다. 따라서 MC의 분해를 위해서 추가적인 고찰이 필요하다고 판단되며 다른 반응 경로의 부산물에 대한 추가적인 고찰을 통해 cement/slag/Fe(II)에서 메탄 계열의 염소계유기화합물의 명확한 분해 경로와 메카니즘을 파악할 수 있을 것이다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 가을 학술발표회 논문집
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• pp.553-560
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• 2002

The improvement effect of soft ground is estimated by unconfined strength mainly. The unconfined strength of solidification agent treated soil is likely to vary with ununiformed mixing ratio and water content change of in-situ ground place by place. So, it is unreasonable to apply a solidification agent mixing ratio obtained from laboratory test results on all over the soft ground. In this study, it was analysed how the unconfined strength would be effected by the water content of soft ground. For this study, a series of unconfined compressive tests are peformed on various water content soil samples. The test results showed that the strength was fallen to 30∼80% by two times increase of water content approximately, This means that strength of solidification agent treated soil is influenced greatly by water content of raw soft ground and mixing ratio of solidification agent. It was suggested that the method how to decide the mixing ratio with soft ground water content.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2002년도 춘계공동학술발표회요약집
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• pp.280.1-280
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• 2002

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2004년도 요약집 춘계학술발표대회
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• pp.268.1-268.1
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• 2004

• 세라미스트
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• 제2권2호
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• pp.36-42
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• 1999

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2004년도 춘계학술발표회
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• pp.667-671
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• 2004

The purpose of this paper is to study on the construction of environmentally friendly roadbed by reinforcing type soil solidification agent. The soil amendment agent used in this study is friendly to the environment, and has a function of soil-cement-agent solidification. The soil amendment agent was admixed with reinforced fiber material for enhancement of strength and durability of roadbed. The project of trial field test of roadbed construction with special reinforcing soil treatment agent was performed in Gyunggido on December 2003. A series of field and laboratory experiments including unconfined compressive strength, permeability were carried out to investigate the physical and mechanical characteristics of solidified roadbed treated by this reinforced solidifying agent. The results of this research showed that the roadbed using normal and poor soil could be efficiently constructed by treatment of this reinforcing type solidification agent admixed with fiber material.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
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• pp.763-768
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• 2003

This study is to specify the properties of solidification/stabilization of heavy metals in connection with looking over the hydration features of non-sintering cement using industrial by-products. In this study, we added Cr and Pb to non-sintering cement(NSC), ordinary portland cement (OPC), and Blast-furnace slag cement(BSC) to specify the solidification process. Heavy metal leaching test was carried out to evaluate solidification degree of various cement. Follow result, marking no higher than 0.7% of un-solidified ratio of BSC was the most predominant result when we mixed the materials with Cr. 5.8% for NSCI and 6.2% for NSC2. On the contrary, in case of adding Pb, NSCl and NSC2 made better solidification results than those of OPC(below 0.2%) and BSC(below 0.05%), marking nearly 0%.