• 한국지반공학회논문집
• /
• 제18권5호
• /
• pp.179-193
• /
• 2002

폐주물사가 반응벽체의 매체로 쓰였을 때의 중금속, 음이온과 PAMs의 용출 특성을 12개의 폐주물사와 3개의 기준 물질(Peerless iron, local fill soil, and torpedo sand)을 선택하여 batch와 column 실험을 통하여 밝혔다. 3개의 기준 물질은 이들로부터 얻어진 용출특성을 폐주물사와 비교하기 위해 사용되었다. Water leach test와 total elemental analyses로부터 얻어진 결과에 따라 모든 폐주물사는 그룹 2에 속하였다. 하지만, 일반적으로 지하수면 아래에 건설재료로 이용되는 3개의 기준물질도 역시 그룹 2로 분류되었다. 따라서, 폐주물사의 반응벽체에의 사용은 일반적인 건설재료를 지하수면 아래에 사용하였을 시와 비교했을 때에 비해 비슷한 농도의 중금속과 음이온이 용출됨을 알 수 있다.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
• /
• pp.386-387
• /
• 2006

This study is about the recycling technology of scrap a PCB(printed circuit board) produced in home appliances or automobile industry. And we develop the recycling technology of cooper (Cu)which is contained to leaching solution. In stead of electrolytic collecting in existing sulphuric atmosphere, we apply process using the ammonia solution which is used in economizing energy. So m the process of electrolyzing scrap a PCB through the leaching and separation, we examine the effect of the nickel contained to the solution and the cooper degree of purity which is changed according to current density.

• Environmental Analysis Health and Toxicology
• /
• 제19권3호
• /
• pp.271-278
• /
• 2004

Epoxy resins are mostly used as a molding material for drinking water tank. Bisphenol A is used at a constituent material for epoxy resins and is widely suspected to act as an endocrine disrupter. In this study, we investigated embryo hatching in zebrafish reared in water undergone leaching process of expoxy resin, and found a decreased survival rate. Bisphenol A eluted from epoxy resin in drinking water tank was completely degraded by TiO$_2$ photocatalysis. We detected 7.8 ng/ml of bisphenol A in epoxy resin tank, and observed that the concentration was undetectable after 48h photocatalysis over TiO$_2$. There was no toxicity in hatching rates in zebrafish and morphogenesis after photocatalysis. The effect of TiO$_2$ photocatalytic reactions on the catalase activities in the f]y stage of zebrafish was also examined. At 1 week post hatching, cataiase activities were higher both in the group of epoxy resin with 48 h TiO$_2$ photocatalysis and in the TiO$_2$ photocatalysis for 48 hours were higher than control group. However catalase activities of the treatment group of epoxy resin by TiO$_2$ photocatalysis for 48 hours were similar to control in 5 weeks post hatching fries. In conclusion, the toxicity of TiO$_2$ photocatalysis was not observed in this zebrafish.

• 대한전기학회논문지:전기물성ㆍ응용부문C
• /
• 제49권6호
• /
• pp.328-334
• /
• 2000

A lithium ion secondary battery using carbon as a negative electrode has been developed. Further improvements to increase the cell capacity are expected by modifying the structure of the carbonaceous material. There are hopes for the development of large capacity lithium ion secondary batteries with long cycle, high energy density, high power density, and high energy efficiency. In the present paper, needle cokes from petroleum were examined as an anode of lithium ion secondary battery. Petroleum cokes, MCL(Molten Caustic Leaching) treated in Korea Institute Energy Research, were carbonized at various temperatures of 0, 500, 700, $19700^{\circ}C$ at heating rate of $2^{\circ}C$/min for lh. The electrolyte was used lM liPF6 EC/DEC (1:1). The voltage range of charge & discharge was 0.0V(0.05V) ~ 2.0V. The treated petroleum coke at $700^{\circ}C$ had an initial capacity over 560mAh.g which beyond the theoretical maximum capacity, 372mAh/g for LiC6. This phenomena suggests that carbon materials with disordered structure had higher cell capacity than that the graphitic carbon materials.

• Journal of the Korean Wood Science and Technology
• /
• 제33권3호통권131호
• /
• pp.53-63
• /
• 2005

본 연구는 바다목장사업 소재로서 방부처리 목재의 사용 가능성에 대한 기초자료를 얻고자 실시하였다. CCA, CCFZ, ACQ 처리재 내 포함된 유해 중금속의 해수에 대한 용탈 안전성을 평가하기 위해 각각 2% 및 3% 방부제 수용액으로 처리한 목재를 증류수, 자연해수 및 인공적으로 염도를 조절한 인공해수에 41일간 폭로하여 기간 별 각 성분의 용탈량을 측정하였다. 바닷물에서 CCA 처리재의 구리 및 크롬의 용탈은 거의 일어나지 않았으며, 다소 많은 비소의 용탈이 있었으나 증류수에서의 용탈에 비해 적은 양을 나타내었다. CCFZ는 증류수에서 크롬과 아연의 용탈량이 매우 높았으나 바닷물에서는 훨씬 적은 용탈량을 나타내었다. 방부제 흡수량 및 인공해수의 염분 농도에 따른 용탈량에는 큰 차이가 없었다. ACQ 처리재는 CCA 및 CCFZ 처리재에 비해 많은 구리 용탈을 나타내었으며 용탈 매체에 따른 차이는 나타나지 않았다.

• 콘크리트학회논문집
• /
• 제25권5호
• /
• pp.539-546
• /
• 2013

1997년 시멘트 산업은 자원 재활용 목적을 위하여 산업폐기물을 시멘트 공장에서 사용하기 시작하였다. 그러나 최근, 산업폐기물의 재활용에 따른 시멘트의 환경유해성이 시멘트 공장주변의 오염과 시멘트 내 중금속 용출로 인하여 문제가 제기되고 있는 실정이다. 특히, 시멘트 내 $C^{6+}$의 존재는 중요한 문제가 되고 있으며, 시멘트 내 $C^{6+}$ 최소화를 위한 연구가 수행되고 있다. 그러나 국내에서는 중금속 용출에 관련된 연구는 대부분 시멘트 관점에서 수행되고 있는 실정이다. 시멘트는 콘크리트 재료로 사용되기 때문에 콘크리트 관점에서의 환경안전성 평가가 필요하다. 따라서 이 논문에서는 가혹한 조건에서 열화된 콘크리트의 중금속 용출평가를 실시하였다. 평가 결과 모든 변수에서 $C^{6+}$는 검출되지 않았다.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2002년도 가을 학술발표회 논문집
• /
• pp.217-222
• /
• 2002

The purposes of this study are to investigate the material characteristics and strength properties of concrete mixed with waste incinerated bottom ash(BA), and to evaluate the leaching of environmentally harmful heavy metals from the bottom ash itself and from hardened concrete mixed with bottom ash. For this purpose, two reference mixes with W/C ratios of 0.45 and 0.55 were used, and the replacement proportion of BA was varied with the ratios of 0%, 30%, 50%, 70%, and 100% by volume of fine aggregate in the reference mixes. The variation of compressive and splitting tensile strength, workability and unit weight of concrete were considered. Test results showed that the strengths, workability and unit weight decreased with increase in proportion of BA replaced. Leaching test results showed that there would be no environmentally harmful problem from using BA as the substitutes of fine aggregates in concrete.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2009년도 춘계 학술대회 제21권1호
• /
• pp.427-428
• /
• 2009

본 연구는 산업부산물인 플라이애쉬와 실리카퓸을 숏크리트에 재활용하기 위한 연구의 일환으로 중금속 용출시험을 통해 환경 안전성을 검증하기 위해 진행되었다. 시험 결과, 국내외 기준에 만족하여 환경적으로 무해한 것으로 판단되었다.

• 환경위생공학
• /
• 제12권1호
• /
• pp.49-58
• /
• 1997

A study on the synthesis of zeolite from bituminous coal ESP fly ash as a raw material, which was emitted from the power plant, was carried out to reduce environmental problems and reuse of the industrial wastes. Bituminous coal fly ash was used as the source of silica and alumina. Zeolite was synthesized by hydrothermal reaction in aqueous NaOH solution with sodium aluminate as additive. The objective of this study is to elucidate the effect of several experimental variables on the synthesis of zeolite. The effects of preroasting temperature, mixing speed, leaching alkalinity, and molar ratio of Na$_{2}$O/SiO$_{2}$ and SiO$_{2}$/Al$_{2}$O of the products were investigated. The synthesized zeolite was proved to be NaA, which is known as 4A type, by comparing with SEM images, and X-ray diffraction analysis. And also we know that the transformation of zeolite A take places into other types of zeolites, i.e. Hydroxysodalite, zeolite P, with the variation of leaching alkalinity.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2000년도 봄 학술발표회 논문집
• /
• pp.205-210
• /
• 2000

This study concerns the cement-solidification. stabilization of the electric furnace dust. Compressive strength and leaching test of heavy metals were evaluated for varing types and ratios of cements and the effect of some additives of hauyne clinker and slag were also discussed. In this cases of using cement binders more than 30%, the compressive strength showed the values over 150kgf/cm2. so it can be used as filler for concrete precastings. Type III cement and Hauyne clinker improved the compressive strength, especially early strength. Leaching amount of heavy metals was decreased when using type III cement and adding hauyne clinker and slag. The values were especially low in the case of slag addition.