| Effect of calcite on Pb-doped solidified waste forms in leaching. | |
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MedLine Citation:
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PMID: 16376409 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The alkalinity of cementitious materials rectifies a low pH of leachant to be over 12 in leaching. The rapid change of leachant pH produces the remarked variation of solubility of heavy metals in the toxicity characteristic leaching procedure. The release of lead on cementitious solid waste forms in leaching was observed in the pH range of particularly 12. The release of lead is significant dependant on the changed values of leachant pH. The pH static leaching procedure (PSLP) was implemented for assessing a quantitative measurement of total potential leachability with the continuing addition of acidic leachant up to the point of no change of leachant pH. The release of lead on Pb-doped solidified waste forms (SWF), in the PSLP, was 27.0% of initial concentration at the maximum meq CH3COOH (about 24.0) added to g dry solidified wastes. In this study, the immobilization effect of calcite on SWF was investigated in the acidic condition by the PSLP. Calcite additions to SWF make a good fixation efficiency of about 92%. Calcite addition abundantly provides the acid neutralization capacity to protect SWF from the attack of acid, with the marked development of hydrated minerals (mainly portlandite and C-S-H) in accordance with the accelerating effect of cement hydration. |
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Authors:
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Dong-Jin Lee |
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Publication Detail:
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Type: Journal Article Date: 2006-01-10 |
Journal Detail:
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Title: Chemosphere Volume: 63 ISSN: 0045-6535 ISO Abbreviation: Chemosphere Publication Date: 2006 Jun |
Date Detail:
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Created Date: 2006-05-22 Completed Date: 2006-08-03 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0320657 Medline TA: Chemosphere Country: England |
Other Details:
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Languages: eng Pagination: 1903-11 Citation Subset: IM |
Affiliation:
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School of Environmental Engineering, Ajou University, San 5, Wonchun-dong, Youngtong-Gu, Suwon, Kyunggi-do 443-749, South Korea. dongj7@ajou.ac.kr |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Calcium
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chemistry Calcium Carbonate / chemistry* Hydrogen-Ion Concentration Industrial Waste Lead / chemistry* Mathematics Models, Chemical* Waste Management / methods* |
| Chemical | |
Reg. No./Substance:
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0/Industrial Waste; 471-34-1/Calcium Carbonate; 7439-92-1/Lead; 7440-70-2/Calcium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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