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 (2014-02-07)
Online
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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; MgKPO 4 ·6H 2 O) ceramic, fabricated from MgO and KH 2 PO 4 , and a calcium sodium phosphate (CNP; CaNaPO 4 ) ceramic, fabricated from CaO and Na 2 HPO 4 , were used as solidification binders in the CBPC process, and Na 2 S 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.
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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: | Tai Gyu Lee ; Eom, Yujin ; Jae Han Cho |
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Zeitschrift: | Journal of hazardous materials, Jg. 278 (2014-02-07) |
Veröffentlichung: | 2014 |
Medientyp: | unknown |
ISSN: | 1873-3336 (print) |
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