Metal releases from a municipal solid waste incineration air pollution control residue mixed with compost

Abstract

The influence of 10 wt.% mature compost was tested on the heavy metal leachate emissions from a calcium-rich municipal solid waste incineration air pollution control residue (MSWI APC). Apart from elongated columns (500 and 1250 mm), an otherwise norm compliant European percolation test setup was used. More than 99% of the metals Al, As, Cd, Cr, Cu, Fe and Ni were left in the APC residue after leaching to a liquid-to-solid ratio (L/S) of 10. Apparent short-term effects of elevated leachate DOC concentrations on heavy metal releases were not detected. Zn and Pb leachate concentrations were one order of magnitude lower for L/S 5 and 10 from the pure APC residue column, which suggests a possible long-term effect of compost on the release of these elements. Prolonging the contact time between the pore water and the material resulted in elevated leachate concentrations at L/S 0.1 to L/S 1 by a factor of 2. Only Cr and Pb concentrations were at their maxima in the first leachates at L/S 0.1. Equilibrium speciation modelling with the PHREEQC code suggested portlandite (Ca(OH)2) to control Ca solubility and pH.

Electrodialytic remediation of municipal solid waste incineration residues using different membranes

“…1 -The increase of Cr leaching after the experiments was also observed in previous researches for ED remediation of similar FA and APC residues [5,15,16]. Cr-solubility in SD and FA has been suggested in other researches to be controlled rather by the presence of sparingly-soluble Cr(VI) phases, like BaCrO 4 and PbCrO 4 , than by Cr(III) phases [26,35]. In fact, the solubility of these Cr(VI) compounds at a high pH is higher than for Cr(III).…”

Lab Scale Simulation of a Leak in a Landfill Cover

“…The differences in metal content can be due to differences in input to the incinerator, but contribution from the FAR cannot be ruled out. Organic matter is feared to enhance leaching of metals from BA, but van Praagh and Persson [16] mixed municipal solid waste incineration fly ash with compost and found no apparent short term effect on metal leaching. The low Cl concentrations cannot only be accounted for by "dilution" of BA with FAR.…”