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http://dx.doi.org/10.4491/eer.2015.092

Solidification/stabilization of simulated cadmium-contaminated wastes with magnesium potassium phosphate cement  

Su, Ying (College of Civil Engineering, YanCheng Institute of Technology)
Yang, Jianming (College of Civil Engineering, YanCheng Institute of Technology)
Liu, Debin (Institute of Water Science in Coastal Regions of Jiangsu Province)
Zhen, Shucong (College of Civil Engineering, YanCheng Institute of Technology)
Lin, Naixi (College of Environment, Hohai University)
Zhou, Yongxin (Institute of Civil Engineering, Suzhou University of Science and Technology)
Publication Information
Environmental Engineering Research / v.21, no.1, 2016 , pp. 15-21 More about this Journal
Abstract
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 $Cd(NO_3)_2$ 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 $NaCdPO_4$, 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.
Keywords
Cd; Magnesium potassium phosphate cement (MKPC); Municipal solid waste incineration fly ash (MSWI FA); Solidification/Stabilization (S/S);
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