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조진규 ( Jo Jin Gyu ),김응호 ( Kim Eung Ho ),김형진 ( Kim Hyeong Jin ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.1
In order to evaluate the utilization validity of solidified sewage sludge as a cover soil for landfill, the characterization for crystallinity. morphology, surface area, and pore structure has been carried out by means of XRD. SEM. and BET, and the adsorption characteristics of CO₂ on Sewage sludge that was solidified with converter slag, fly ash, and quicklime were investigated. The surface area was increased 2-4 times after solidification. especially, solidified Sewage Sludee including 10% auicklime was most. The amount of CO₂ adsorbed was increased in proportion to surface area of solidified sewage sludge. The maximum adsorption amount of CO₂ was 6.0 ㎎ for the solidified sewage Sludge including 10% quicklime and 4.9 ㎎ for the 10% quicklime and 40% slag added one at 40℃, 3 atm. respectively. The adsorption amount was increased 2 times after solidification. As the mixing amount of quicklime added more, adsorption amount became larger, so adsorption amount was affected by quicklime.
황인백 ( Hwang In Baek ),양태선 ( Yang Tae Seon ),한자중 ( Han Ja Jung ),조진규 ( Jo Jin Gyu ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
This paper describes influence on chemical damage in tunnels. This case containes investigation of efflorescence, spalling and scaling as leaking acid mine water into tunnel, two times, for 5 years. The paper presents the situations and several tests which explains the chemical damage in tunnel.
황인백(Hwang In Baek),양태선(Yang Tae Seon),한자중(Han Ja Jung),조진규(Jo Jin Gyu) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This paper describes influence on chemical damage in tunnels. This case containes investigation of efflorescence, spalling and scaling as leaking acid mine water into tunnel, two times, for 5 years. The paper presents the situations and several tests which explains the chemical damage in tunnel
생석회와 전로슬래그를 이용한 미소화슬러지 탈수케잌의 안정화 및 고화처리
김응호 ( Kim Eung Ho ),김세호 ( Kim Se Ho ),조진규 ( Jo Jin Gyu ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.1
The applicability of raw sludge as a daily or intermediate landfill cover is investigated where the raw sludge is stabilized using quciklime as a stabilizing agent and is solidified using the converter Slag as a solidifying agent. To confirm the effect of stabilization, the variation of pH and the coliform group numbers are investigated. To confirm the effect of solidification. the uniaxial compressive strength. pH. leaching of heavy metal. and submerged effect are investigated. The microstructure analysis, SEM(Scanning Electron Microscope). EDS(Energy Dispersive x-ray Spectrometer) and XRD(X-ray Diffraction Analysis) are carried out. When the mixing ratios of quicklime are 5-20% after 2 hours, and pH contents are maintained above 12. the coliform group numbers decrease from 120.000 MPN/g to 1.00 0-3,500 MPN/g. These results are satisfied the EPA. Class B criteria. The uniaxial compressive strength of each specimen mixed with the raw sludge, the converter slag, and the quicklime with mixing ratios of 100:20:10. 100:30:15. 100:40:15 are 9.37㎏/㎠. 10.22㎏/㎠. and 12.19㎏/㎠ respectively. PH contents are tested under the Korean toxic waste criteria , 12.5 in all conditions. The leaching test shows the content below the Korean toxic waste criteria for four ions, Cu, Pb, Cd. and CP`. When finishing moist curing of specimen for one day. the differences of their weight and uniaxial compressive strength between before and after moist curing are measured. The result of this measurement shows that the differences of them are considerably little that moist curing does not affect the weight and uniaxial compressive Strength of specimen. The miciostructure analysis by SEM shows that needlelike crystals appear as the solidification proceed. The analysis of these crystals by EDS confirms that these main components are Ca, Si etc. Also, XRD analysis shows that the main solidification products are CSH, in addition. Ca(OH)₂, CAH are observed.