| Influence of carbonation on the acid neutralization capacity of cements and cement-solidified/stabilized electroplating sludge. | |
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MedLine Citation:
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PMID: 19062068 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Portland cement (PC) and blended cements containing pulverized fuel ash (PFA) or granulated blast-furnace slag (GGBS) were used to solidify/stabilize an electroplating sludge in this work. The acid neutralization capacity (ANC) of the hydrated pastes increased in the order of PC > PC/GGBS > PC/PFA. The GGBS or PFA replacement (80 wt%) reduced the ANC of the hydrated pastes by 30-50%. The ANC of the blended cement-solidified electroplating sludge (cement/sludge 1:2) was 20-30% higher than that of the hydrated blended cement pastes. Upon carbonation, there was little difference in the ANC of the three cement pastes, but the presence of electroplating sludge (cement/sludge 1:2) increased the ANC by 20%. Blended cements were more effective binders for immobilization of Ni, Cr and Cu, compared with PC, whereas Zn was encapsulated more effectively in the latter. Accelerated carbonation improved the immobilization of Cr, Cu and Zn, but not Ni. The geochemical code PHREEQC, with the edited database from EQ3/6 and HATCHES, was used to calculate the saturation index and solubility of likely heavy metal precipitates in cement-based solidification/stabilization systems. The release of heavy metals could be related to the disruption of cement matrices and the remarkable variation of solubility of heavy metal precipitates at different pH values. |
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Authors:
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Quanyuan Chen; Lina Zhang; Yujuan Ke; Colin Hills; Yanming Kang |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-12-04 |
Journal Detail:
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Title: Chemosphere Volume: 74 ISSN: 1879-1298 ISO Abbreviation: Chemosphere Publication Date: 2009 Feb |
Date Detail:
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Created Date: 2009-01-26 Completed Date: 2009-03-26 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: 758-64 Citation Subset: IM |
Affiliation:
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School of Environmental Science and Engineering, Donghua University, Shanghai 200051, PR China. qychen@dhu.edu.cn |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Construction Materials* Electroplating / methods* Metals, Heavy / chemistry Sewage / chemistry* X-Ray Diffraction |
| Chemical | |
Reg. No./Substance:
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0/Metals, Heavy; 0/Sewage |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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