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Solidification/stabilization of simulated cadmium-contaminated wastes with magnesium potassium phosphate cement
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  • Journal title : Environmental Engineering Research
  • Volume 21, Issue 1,  2016, pp.15-21
  • Publisher : Korean Society of Environmental Engineering
  • DOI : 10.4491/eer.2015.092
 Title & Authors
Solidification/stabilization of simulated cadmium-contaminated wastes with magnesium potassium phosphate cement
Su, Ying; Yang, Jianming; Liu, Debin; Zhen, Shucong; Lin, Naixi; Zhou, Yongxin;
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Magnesium potassium phosphate cement (MKPC) is an effective agent for solidification/stabilization (S/S) technology. To further explore the mechanism of the S/S by MKPC, two kinds of Cd including solution (L-Cd) and municipal solid waste incineration fly ash (MSWI FA) adsorbed Cd (S-Cd), were used to compare the effects of the form of heavy metal on S/S. The results showed that all the MKPC pastes had a high unconfined compressive strength (UCS) above 11 MPa. For L-Cd pastes, Cd leaching concentration increased with the increase of Cd content, and decreased with the increase of curing time. With the percentage of MSWI FA below 20%, S-Cd pastes exhibited similar Cd leaching concentrations as those of L-Cd pastes, while when the content of MSWI FA come up to 30%, the Cd leaching concentration increased significantly. To meet the standard GB5085.3-2007, the highest addition of S-Cd was 30% MSWI FA (6% Cd contained), with the Cd leaching concentration of 0.817 mg/L. The S/S of L-Cd is mainly due to chemical fixation, and the hydration compound of Cd was , while the S/S of S-Cd is due to physical encapsulation, which is dependent on the pore/crack size and porosity of the MKPC pastes.
Cd;Magnesium potassium phosphate cement (MKPC);Municipal solid waste incineration fly ash (MSWI FA);Solidification/Stabilization (S/S);
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