• Proceedings of the Korean Institute of Resources Recycling Conference
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• 2001.05a
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• pp.69-72
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• 2001

• Journal of Soil and Groundwater Environment
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• v.6 no.1
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• pp.23-31
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• 2001

Melting is one of the most effective treatments for stabilizing heavy metals and also creates high value by-products. In this study, authors evaluated the leaching characteristics of heavy metals in melting slag obtained by incinerator ashes. In order to evaluate the environmental compatibility of the recycled melting slag, the samples were analysed various leaching tests of heavy metals with raw incinerator ashes, melting slag and the construction materials recycled from melting slag. As the results : (1) The leaching concentrations of the melting slag were lower than those of the raw incinerator ashes in the experiment performed in accordance with Korea Standard Leaching Test (KSLT). (2) The heavy metal concentration of long term leaching test, which was conducted in various pH conditions, were under the standard level of regulation in KSLT. (3) The leaching concentration of mortar samples used for evaluating the feasibility of recycling the melting slag as construction materials also shows the suitable range for recycling. (4) The result of leaching test with the method of RG Min-StB 93, FGSV (Forschungsgesellschaft fur Stra$\beta$en- und Verkehrswesen) met the requirements in German.

• Journal of the Korean Recycled Construction Resources Institute
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• v.5 no.3
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• pp.55-62
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• 2010

This is an experimental research in order to judge the applicability of sewage sludge incineration ash having applied the mixing proportion needed to manufacture bricks and to do plaster work with addition of hwangtoh and slaked lime as a part of the methods for utilizing the wastes produced from sewage sludge incineration ash. Based on the results from experiment and analysis, it is judged that, in case of mixing proportion of 1:2 for the purpose of plastering and masonry work, the cement mortar produced by using a 10% addition ratio of sewage sludge incineration ash with mixture of hwangtoh covering all range of addition ratio, and also the cement mortar produced by using a 20% of sewage sludge incineration ash together with 0% and 10% addition ratio of hwangtoh, was possible to be applied to the practical use. In case of mixing proportion of 1:7 for manufacture of bricks and blocks, if such brick and block products are produced with 10% and 20% addition ratio of sewage sludge incineration ash having added aggregate fines or stone dust that has been actually used in brick and block manufacturing, it is judged that these bricks and blocks could be practically used in the job sites, although strength development is a little bit lower.

• Resources Recycling
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• v.19 no.5
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• pp.68-74
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• 2010

The aim of this study is to investigate the behaviors of synthesis of Calcium Chloroaluminte($11CaO{\cdot}7Al_2O_3{\cdot}CaCl_2$) under the melting temperature of municipal solid waste incineration fly ash(MSWI fly ash); $900^{\circ}C-1300^{\circ}C$ of sintering temperature. A sludge generated from a water purification plant (SW) was also used to fill up $Al_2O_3$ source, which might be deficient in MSWI fly ash. MF and SW were mixed at mixing ratio of 10 to 7, which is the mole ratio of CaO to $Al_2O_3$ of calcium Chloroaluminte. Mixed samples were sintered in the opened sintering reactor and the closed sintering reactor, respectively. The results showed that calcium chloroaluminte was formed at $1,000^{\circ}C$ in both reactors, but the temperature of decomposition of calcium chloroaluminte depended upon sintering reactor type; an opened sintering reactor and a closed sintering reactor, owing to the vaporization velocity of Cl.

• Resources Recycling
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• v.19 no.1
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• pp.40-48
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• 2010

It was investigated that effects of NaOH concentration on synthesis of mesoporous materials using municipal solid waste incinerator ash slag (MSWI-ash slag). In order to increase the purity and maximize the amount of extracted Si content the raw MSWI-ash slag was mechanically activated. Extraction of Si from the MSWI-ash slag was carried out by alkali treatment using concentrated NaOH solution, which varied from 1M to 4M. Physical properties (i.e., pore size, specific surface area and total pore volume) of the synthesized mesoporous silica were also evaluated as a function of NaOH concentration via BET, SEM, TEM and small-angle X-ray scattering analyses. Over the entire range of NaOH concentration investigated (i.e., 1-4M), the synthesized mesoporous materials were determined to be SBA-15, which exhibited a hexagonal structure with the pore size of approximately 7 nm. On the other hand, specific surface area and total pore volume increased with NaOH concentration up to 3M while the values decreased at 4M, indicating that the optimal NaOH concentration for the synthesized mesoporous silica was approximately 3M. Further comparison analysis between two conditions (3M versus 4M) showed that the decrease in two physical properties at 4M NaOH concentration was likely due to the potential inhibition by excess Na ions on the formation of mesophase and the consequent increase of pore wall thickness by remaining Si ions.

• Proceedings of the Korean Institute of Resources Recycling Conference
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• 2001.05a
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• pp.427-432
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• 2001

• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.825-828
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• 2009

고형원료인 폐기물의 감량화 및 자원화 기술 중 가장 대표적인 기술로 폐기물의 소각(incineration)기술과 가스화(gasification)용융기술을 들 수 있다. 폐기물 가스화 기술은 폐기물 내의 탄소, 수소 성분을 가스화하여 CO, $H_2$가 주성분인 합성가스(synthesis gas, syngas)로 전환하여 불연물은 용융되어 환경적으로 무해한 슬래그로 회수하는 기술이다. 폐기물 가스화 용융 시스템으로 발생된 합성가스를 재순환하여 사용하는 합성가스 재순환시스템을 통해 가스화에 필요한 열을 시스템 내에서 대체하여 사용하는 기술개발은 폐기물 가스화 용융기술의 경제성을 높일 수 있다. 본 연구에서는 고형 폐기물 가스화반응에 의해 발생되는 합성가스를 재순환하여 폐기물 가스화 용융 시스템내의 자체 에너지원으로 활용할 수 있도록 하는 합성가스 재순환 시스템 및 버너의 운전특성을 고찰하였다. 합성가스의 재순환 장치에서의 운전 압력 제어 및 유량제어를 통해서 안정적인 합성가스 재순환 성능과 재순환버너의 연소 성능을 유지할 수 있었다. 합성가스 재순환버너에 의한 16,800 $kcal/Nm^3$ 조건 및 33,600 $kcal/Nm^3$ 조건에서 운전시에도 가스화기의 운전온도는 안정적으로 유지됨에 따라 생산된 합성가스의 가스화기 보조연료 대체 및 에너지절감이 가능한 것으로 판단된다.

• Analytical Science and Technology
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• v.22 no.2
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• pp.119-127
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• 2009

This study was carried out to investigate the distribution characteristics of persistent organic pollutants in incineration residues at industrial waste incinerators and municipal solid waste incinerators, which were analyzed by the official analytical method for the endocrine disrupting chemicals and the waste. Seven of 12 persistent organic pollutants were quantitatively analyzed by GC-MSD (SIM-mode). Hexachlorobenzene was detected in 21 samples among 44 incineration residues. The level of hexachlorobenzene was 0.132-8.138 ng/g in incineration residues, 0.195-5.765 ng/g in fly ash at industrial waste incinerators, 0.270-1.828 ng/g in bottom ash and 0.154-50.643 ng/g in fly ash at municipal solid waste incinerators, respectively.

• Journal of the Korea Organic Resources Recycling Association
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• v.17 no.1
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• pp.88-95
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• 2009

This study is for understanding the domestic possibilities of the high temperature incineration of waste containing Polychlorinated Biphenyls (PCBs) with the analysis of normal operation case and waste gas, fly ash, dioxin about bottom ash, Total-PCBs, Co-PCBs, and the for analysis the heavy metal leaching feature included by bottom ash and fly ash, heavy metal leaching experiment was implemented. The result shows the dioxin density of the waste gas from waste containing PCBs was $0.00699{\sim}0.00763ng-TEQ/Nm^3$, which is lower than $0.0192ng-TEQ/Nm^3$ from the normal operation case. And each Co-PCBs and total PCBs shows $0.00043{\sim}0.00112ng-TEQ/Nm^3$ and $3.06{\sim}3.87ng/m^3$ respectively. The bottom ash test result shows Dioxin 0.00225~0.00630ng-TEQ/g, Co-PCBs 0.00027~0.00082ng-TEQ/g, Total PCBs 0.9~2.6ng/g, and the fly ash shows Dioxin 0.00164~0.00344ng-TEQ/g, Co-PCBs 0.00053~0.00054ng-EQ/g, Total PCBs 0.64~0.84ng/g. The bottom ash and fly ash experiments for heavy metal leaching did not show any leaching but when it comes to the ingredients of the fly ash, Pb elements shows 31.01~237.7ppm, higher than leaching criterion. The analysis of the density of all air pollution material from the waste gas shows the lower value than permissible criterion.

• Proceedings of the Korean Institute of Resources Recycling Conference
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• 2005.10a
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• pp.240-242
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• 2005

본 연구에서는 생활폐기물 소각장에서 발생하고 있는 바닥재를 이용하여 각 입도에 대해 자력의 세기에 따라 철/비철선별 하였다. 자력의 세기에 따른 분리량과 분리된 산물의 철함 유량을 조사함으로써 자력 및 비철 효율을 파악하고자 하였다. 또한, 비철 선별기를 사용하여 비철 선별 효율을 조사하였다. 자력선별결과, 자력의 세기가 증가할수록 자력선별에 의해 분리량이 증가하였으나, 분리된 산물의 철함유량은 감소하는 경향을 나타내었다. 이러한 결과는 자력세기의 증가가 철회수량의 증가보다는 불순물의 혼입량을 증가시키는 것으로 생각된다. 비철의 경우, 입자크기가 커짐에 따라 분리율이 높았으며, 4.75mm이상에서는 대부분의 비철이 회수되었다.