FEASIBILITY TEST OF ELECTRODIALYTICALLY UPGRADED MSWI APC RESIDUE UTILIZATION IN MORTAR

摘要

Air pollution control (APC) residue from municipal solid waste incineration (MSWI) is classified as hazardous waste and disposed of, although it contains potential resources. Here, it was investigated whether MSWI APC residue may partly substitute cement in Portland cement mortar after upgrading by electrodialytic removal of heavy metals and salts. Electrodialytically upgraded MSWI APC residue was compared mainly to coal APC residue, which is used in Portland cement based materials already. Raw MSWI APC residue was also tested. The three APC residues were used in tests that included heavy metal (As, Ba, Cd, Cu, Cr, Pb and Zn) leaching and selected tests of Portland cement mortars with and without APC residue. The mortars were mixed with a w/b-ratio of 0.5, and 15 volume percent replacement of cement by APC residue and tested for heat development, compressive strength and possible cracks. The upgraded MSWI APC residue showed lower heavy metal leaching than the coal APC residue, except for Pb and Zn. The initial setting time was delayed about 10 hours in the mortar with upgraded MSWI APC residue compared to the reference mortar (no APC residue) and the coal APC residue mortar. The compressive strength of the mortars was tested after 7, 32 and 56 days and was in the order: reference upgraded MSWI APC residue > coal APC residue > raw MSWI APC residue. The results of this study indicated potential for using electrodialytically upgraded MSWI APC residue in Portland cement based materials.