Host: The Japan Society of Waste Management Experts
Processed sandy residue, which was going to be landfilled, generated from mixed construction and demolition waste was selected as the subject of the study, and understanding basic property and discussion of composition of ignition loss (IL) were conducted. From the above, the target material for decreasing IL was elucidated, and then validity of IL used in landfill standard for inert industrial solid waste was discussed. (1) The mean values of IL were mostly above 5 % and the residue should not be dumped in inert type landfill in principle. (2) From the results of heavy medium separation, wood is about 2 % and plastic is below 0.1 % for the floating material, and about 8 to 13 % is the amount of organic matter (0.45 % as paper) and combined water for sediment. The amount of these values was estimated as IL of the residue. (3) Most of IL in the sediment was possibly due to dewater of combined water contained in mortar. From the above, since most of IL of sandy residue was due to combined water, IL could not be decreased to below 5 % even if wood, which is major organic matter in sandy residue, was removed.