• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2003.05a
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• pp.617-620
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• 2003

열분해를 이용한 폐기물의 처리가 여러 유해물질을 저감시킬 수 있다는 기대감으로 국내에서도 열분해를 이용한 폐기물 처리 관련 연구가 많이 진행되고 있다. 아울러 폐기물을 열분해 한 후에 산소를 공급하여 가스화와 동시에 잔재를 용융시키는 열분해 가스화 용융이나 예열공기와 혼합하여 고온으로 연소시키면서 잔재를 용융하는 열분해 연소 용융 등의 방식이 개발되면서 다이옥신과 소각재의 발생을 차단하는, 환경적으로는 제로 에미션(zero-emission)에 근접하는 기술에 대한 관심도 높아지고 있다.(중략)

• Annual Conference of KIPS
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• 2006.11a
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• pp.447-450
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• 2006

본 연구는 국내에서 발생되는 소각재를 재활용하여 벽돌 생산을 하는 공장에서의 이원화된 작업현황을 일원화 할 수 있는 데이터 모니터링 시스템 구축을 목적으로 한다. 이를 위하여 RFID 센싱 기술을 생산 공정에 도입하여 공정관리 시스템을 획기적으로 개선할 수 있도록 하였다. 각종 계측기 및 센서의 신호를 데이터 수집 장치인 IDMC-Net8842를 이용하여 실시간으로 수집하고 유/무선 통신 모듈을 이용한 TCP/IP 연결을 통하여 모니터링 서버에 접속하여 실시간으로 현장의 상황을 확인하여 제어할 수 있는 시스템을 구축하고자 한다.

• Resources Recycling
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• v.16 no.3 s.77
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• pp.19-26
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• 2007

The bottom ash of municipal solid waste incineration generated during incineration of municipal solid waste in metropolitan area consists of ceramics, glasses, ferrous materials, combustible materials and food waste and so on. Although the ferrous material was separated by the magnetic separation before the incineration process, of which content accounts for about $3{\sim}11%$ in bottom ash. The formation of a $Fe_3O_4-Fe_2O_3$ double layer(similar to pure Fe) on the iron surface was found during air-annealing in the incinerator at $1000^{\circ}C$. A strong thermal shock, such as that takes place during water-cooling of bottom ash, leads to the breakdown of this oxidation layer, facilitating the degradation of ferrous metals and the formation of corrosion products and it existed as $Fe_2O_3,\;Fe_3O_4\;and\;FeS_2$. So, many problems could occur in the use of bottom ash as an aggregate substitutes in construction field. Therefore, in this study, the separation of ferrous materials from municipal solid waste incineration bottom ash was investigated. In the result, the ferrous product(such as $Fe_2O_3,\;Fe_3O_4,\;FeS_2$ and iron) by magnetic separator at 3800 gauss per total bottom ash(w/w.%) accounted for about 18.7%, and 87.7% of the ferrous product was in the size over 1.18 mm. Also the iron per total bottom ash accounted for about 3.8% and the majority of it was in the size over 1.18 mm.

• Journal of Korean Society of Environmental Engineers
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• v.38 no.10
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• pp.574-579
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• 2016

This study assessed feasibility of making granular fertilizer with fly ash from a sewage sludge incinerator in Korea. Composition, characteristics, strength, and heavy metal contents of the granular fertilizers were investigated. Due to its high contents of phosphorus, fly ash from a sewage sludge incinerator could be used to make fertilizers. Granulation rates (2-4 mm granules) over 80% could be achieved as the fly ash contents were 15% or less of the fertilizer. Leaching tests of the fertilizers, based upon the Korean Standard Methods for Solid Wastes, showed the concentrations of heavy metals less than the risk limits. However, contents analysis of the fertilizers, based upon the Korean Standard Methods for Soils, experienced higher levels of heavy metals than the risk limits as the fly ash content exceeded 7% of the fertilizer. Thus, the fly ash needs to be added less than 7% of the fertilizer if there is no pretreatment to remove heavy metals.

• Journal of Korean Society of Water and Wastewater
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• v.30 no.5
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• pp.571-577
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• 2016

Phosphorus is an essential and irreplaceable element for all living organisms and its resource is limited. Significant amount of used phosphorus is collected in sewage treatment plant as sludge. Sludge ash after incineration contains about 10% of phosphorus in dry mass basis, which is comparable to phosphate rocks, and it is an important source of phosphorus recovery. Acid and alkali were used to leach phosphorus from sludge ash and compared for their leaching kinetics and performance. Phosphorus leaching by NaOH was fast and 0.2 N and 2 N NaOH leached 49% and 56% of the total phosphorus in the sludge ash at the L/S ratio of 100. Phosphorus leaching by sulphuric acid and hydrochloric were very fast and most of the phosphorus was leached in 5 minutes. In case of sulphuric acid 95% of the total phosphorus in the sludge ash was leached by 0.2 N at the L/S ratio of 100 and 93% was leached by 1 N at the L/S ratio of 10. 1 N hydrochloric acid leached 99% of the total phosphorus at the L/S ratio of 10. The results showed acids were more effective than alkali for phosphorus leaching from sludge ash and hydrochloric acid leached more phosphorus than sulphuric acid.

• Journal of the Korea Organic Resources Recycling Association
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• v.18 no.2
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• pp.84-92
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• 2010

This research was conducted to investigate physico-chemical characteristics of municipal solid waste (MSW) generated from T City, Gangwon-do and leaching characteristics of the incineration ash. From the results, bulk density of MSW in T city was $231kg/m^3$. Combustible and incombustible components were in 94.0% and 6.0%, respectively. Food waste and papers in combustible component occupied 32.3% and 41.2%. Water, volatile solids, and ash content were 41.3%, 50.5%, and 8.2%. C, H, O, N, S, and Cl showed 51.4%, 6.3%, 26.7%, 1.1%, 0.2%, 0.5%, respectively. Low heating value (2,704 kcal/kg) of T city was similar to 2,764 kcal/kg of Chuncheon and was 1,000 kcal/kg higher than 1,467~1,584 kcal/kg of the past Kuro-gu and Koyang city. The specification of leaching characteristics of the incineration ash were within the Korean regulation standard.

• Journal of environmental and Sanitary engineering
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• v.18 no.2
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• pp.34-41
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• 2003

The purpose of this study is to examine the effect of stabilization disposal and recycling on incinerated paper mill sludge ash as cement additives. It was investigated chemical(pH, ICP, TGA XRD) and physical(PDA, SEM) characteristics of the incineration ash. And the pozzolanic characteristics of incineration ash was applied to cement as additive to increase the compressive strength. The results were that the pH characteristic of incineration ash was strong alkalinity, the content of silica and alumina as a pozzolanic material was 50.97%, and the average particle size was $5.03{\mu}m$ respectively. When the ash contents as cement additive were varied in 0~15%(wt) of cement weight to explore the effect of the compressive strength on the solidified cement mortar, the proper amount of the incineration ash substituted was about 5~l0%(wt). Therefore we found that using the incineration ash as cement additive obtains the recycling of waste material, the stabilization disposal, the reduction of waste disposal expense, and the protection of environmental problem, too.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2008.11a
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• pp.447-451
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• 2008

28 kHz 주파수, 조사강도 70 W/L, pH 7로 조정, 조사시간 5 min으로 전처리된 비산재를 사용하여 인공경량골재의 시편을 제조하여 압축강도, 흡수율, 단위용적중량을 분석하였다. 분석 결과 압축강도는 평균 18 MPa 이상으로 측정되어 기준인 18 MPa를 만족하였으며, 흡수율은 국내 기준은 없지만 일본의 기준인 12% 이하보다 매우 높은 흡수율을 나타내었다. 단위용적중량은 기준(1650 kgf/m$^3$ 이하)에는 만족하지만 비교적 낮은 값을 보였으며, 중금속 용출시험결과 측정항목에서 매우 저농도로 나타나 환경상 위해성은 매우 미미할 것이라 판단된다.

• 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.

• Journal of Industrial Technology
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• v.20 no.B
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• pp.55-62
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• 2000

The purpose of this research is to find out how the inlet angle of secondary air affects the formation of recirculation zone inside a small incinerator. A commercial code, PHOENICS, is used to simulate the flow field of an incinerator. The computational grid system is constructed by Multi-Block technique. Numerical experiments are done with the five different angles of secondary air inlet. The formation of recirculation zone is evaluated by checking velocity fields. The computational results show that recirculation zone is clearly formed from 60 degree of inlet angle and the zone of recirculation is widen as angle of recirculation is increased to $75^{\circ}$.