• Title/Summary/Keyword: Waste lime

Search Result 158, Processing Time 0.035 seconds

Chemical Treatment of Low-level Radioactive Liquid Waste (I)

  • Lee, Sang-Hoon;Choe, Jong-In;Kim, Yong-Eak
    • Nuclear Engineering and Technology
    • /
    • v.8 no.2
    • /
    • pp.69-76
    • /
    • 1976
  • This experiment has been carried out for the removal of long-lived radioactive-nuclides (Sr-90, Ru-106, Cs-137 and Ce-144) contained in the low-level radioactive effluents from the spent fuel reprocessing plant and nuclear power plant, in order to determine the decontaminability of various chemical coagulants and domestic clay mineral (montmorillonite). Phosphate process showed prominent efficiency for the removal of Ce-144, and lime-soda process did good removal efficiency for Sr-90. About Cs-137 copper-ferrocyanide process is much desirable. In phosphate or lime-soda process, most favorable removal efficiency was obtained at more than pH 11. The montmorillonite treated with sodium chloride showed a considerable improvement in the removal of the radioactive-nuclides. By a combined chemicals-montmorillionite process, the radioactive-nuclides could be more effectively removed than by the only chemicals process.

  • PDF

Development of Landfill Material by Utilizing Waste Lime

  • Shin, Eun-Chul;Oh, Young-In
    • Journal of the Korean Geotechnical Society
    • /
    • v.15 no.3
    • /
    • pp.17-25
    • /
    • 1999
  • The feasibility of using waste lime, which is produced as a byproduct during the manufacture of sodium carbonate in Inchon, Korea. as a stabilization admixture with weathered granite soil was investigated. Laboratory tests were conducted to determine the chemical composition, pH, compaction characteristics, unconfined compression strength. X-ray diffraction analysis of waste lime and weathered granite soil admixtures. Based on the present tests, it appears that the admixtures are environmentally safe and can be used as landfill material.

  • PDF

Evaluation of Seawater Resistance of a Non-Sintering Inorganic Binder Using Phosphogypsum and Waste Lime as Activators

  • Kim, Ji-Hoon;Mun, Kyung-Ju;Hyung, Won-Gil
    • Journal of the Korea Institute of Building Construction
    • /
    • v.18 no.2
    • /
    • pp.185-193
    • /
    • 2018
  • In this study, using Granulated Blast Furnace Slag (GBFS), an industrial byproduct, and Phosphogypsum (PG), and Waste Lime (WL) as activator, non-sintering binder (NSB) which does not require a sintering process was produced, and the chemical penetration resistance was evaluated through a seawater resistance experiment. The result of the experiment showed that the inside of NSB mortar saw almost no influence from the ions in seawater due to its dense structure. Also, as it appears that only the surface reacts with ions in seawater while spreading inward is suppressed, the high seawater resistance of NSB could be confirmed.

The applicability of Freundlich's isotherm model for the leaching of solidified hazardous waste using cementitious binders

  • Youn Jong Ho;Lee Heon Mo;Jeong Byung Gon;Chung Yong Hyun
    • Environmental Sciences Bulletin of The Korean Environmental Sciences Society
    • /
    • v.2 no.1
    • /
    • pp.9-19
    • /
    • 1998
  • A laboratory study was conducted to investigate the immobilization of the laboratory waste sludge, mainly from chemical oxygen demand (COD) waste, using cementitious binders. The binders were: Ordinary Portland Cement (OPC), and lime-Rice Husk Ash(RHA) cement. The economic evaluation was done for three different kinds of cementitious binders, namely, OPC, Portalnd Rice Husk Ash Cement (PRHAC) which contained rice husk ash 50 percent by dry weight, and lime-RHA cement. The result showed that lime-RHA cement was the cheapest. The applicability of Freundlich's desorption isotherm was studied to assess the teachability of sludges. The teachability of cement mortars was found to follow the desorption isotherms. Therefore, it was concluded that based on this test, the leachate concentrations of the solidified heavy metals could be predicted, approximately by the Freundlich's isotherm desorption modeling.

  • PDF

The applicability of Freundlichs isotherm model for the leaching of solidified hazardous waste using cementitious binders

  • Jong Ho Youn;Heo
    • Journal of Environmental Science International
    • /
    • v.2 no.1
    • /
    • pp.9.2-19
    • /
    • 1993
  • A laboratory study was conducted to investigate the immobilization of the laboratory waste sludge, mainly from chemical oxygen demand (COD) waste, using cementitious binders. The binders were: Ordinary Portland Cement (OPC), and lime-Rice Husk Ash (RHA) cement. The economic evaluation was done for three different kinds of cementitious binders, namely, OPC, Portaind Rice Husk Ash Cement (PRHAC) which contained rice husk ash U percent by dry weight, and lime-RHA cement. The result showed that lime-RHA cement was the cheapest. The applicability of Freundlich's desorption isotherm was studied to assess the teachability of sludges. The teachability of cement mortars was found to follow the desorption isotherms. Therefore, it was concluded that based on this test, the leachate concentrations of the solidified heavy metals could be predicted, approximately by the Freundlich's isotherm desorption modeling.

  • PDF

The study of chemical treatment of pulp mill bleaching waste liquor using lime (석회를 이용한 펄프공장 폐액의 화학적 처리에 관한 연구)

  • 정병곤;이헌모;윤종호
    • Journal of environmental and Sanitary engineering
    • /
    • v.12 no.2
    • /
    • pp.23-28
    • /
    • 1997
  • This study was conducted to know the possibility of reducing lime dosage by recycling sludge from bleaching wastewater lime coagulation settlement treatment at pulp mill process. In case of bleaching wastewater at the pulp mill process, when the lime dosage was increased, the removal efficiency of TSS(Total Suspended Solids) was increased, proportionally, but the organic removal efficiency was increased very slowly. It was concluded that sludge recycling at the lime coagulation settlement process was effective method to reduce the requirement of lime dosage. At the lime coagulation settlement process with sludge recycling, when the recycling number was increased, the organic removal efficiency was decreased, sharply. It was evaluated that the pH could be the basic standard for lime supplement by sludge recycling.

  • PDF

Hydration Reaction of Non-Sintering Cement using Waste Gypsum and Waste Lime with Activators (폐석고 및 폐석회를 자극제로 이용한 비소성 시멘트의 수화반응)

  • Mun, Kyoung-Ju;Soh, Yang-Seob
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2004.05a
    • /
    • pp.232-235
    • /
    • 2004
  • This study aims to manufacture non-sintering cement(NSC) by adding phosphogypsum(PG) and waste lime(WL) to granulated blast furnace slag(GBFS) as sulfate and alkali activators. This study also investigates the basic physical properties and hydration reaction of NSC, and evaluates its reusing possibility as construction material. Results obtained from this study have shown that GBFS was affected by $So_4^{2-}$ in waste PG and stimuli under wet condition, left slag components, created Ettringite and CSH gels, and eventually started being hydrated. These hydrated creations formed dense structures like CSH based on Ettringite and contributed in allowing the mortar to reveal high strength.

  • PDF