Stabilization/solidification of mercury-contaminated waste ash using calcium sodium phosphate (CNP) and magnesium potassium phosphate (MKP) processes.
In: Journal of hazardous materials, Jg. 278 (2014-08-15), S. 474-82
academicJournal
Zugriff:
This study examined the stabilization and solidification (S/S) of mercury (Hg)-contaminated waste ash generated from an industrial waste incinerator using chemically bonded phosphate ceramic (CBPC) technology. A magnesium potassium phosphate (MKP; MgKPO4 · 6H2O) ceramic, fabricated from MgO and KH2PO4, and a calcium sodium phosphate (CNP; CaNaPO4) ceramic, fabricated from CaO and Na2HPO4, were used as solidification binders in the CBPC process, and Na2S or FeS was added to each solidification binder to stabilize the Hg-contaminated waste ash. The S/S processes were conducted under various operating conditions (based on the solidification binder and stabilization reagent, stabilization reagent dosage, and waste loading ratio), and the performance characteristics of the S/S sample under each operating condition were compared, including the Hg leaching value and compressive strength. The Hg leaching value of untreated Hg-contaminated waste ash was 231.3 μg/L, whereas the S/S samples treated using the MKP and CNP processes exhibited Hg leaching values below the universal treatment standard (UTS) limit (25 μg/L). Although the compressive strengths of the S/S samples decreased as the sulfide dosage and waste loading ratio were increased, most of the S/S samples fabricated by the MKP and CNP processes exhibited good mechanical properties.
(Copyright © 2014 Elsevier B.V. All rights reserved.)
Titel: |
Stabilization/solidification of mercury-contaminated waste ash using calcium sodium phosphate (CNP) and magnesium potassium phosphate (MKP) processes.
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Autor/in / Beteiligte Person: | Cho, JH ; Eom, Y ; Lee, TG |
Zeitschrift: | Journal of hazardous materials, Jg. 278 (2014-08-15), S. 474-82 |
Veröffentlichung: | Amsterdam : Elsevier,, 2014 |
Medientyp: | academicJournal |
ISSN: | 1873-3336 (electronic) |
DOI: | 10.1016/j.jhazmat.2014.06.026 |
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