DETERMINATION OF THE LEACHING DYNAMICS OF METALS FROM MUNICIPAL SOLID-WASTE INCINERATOR FLY-ASH USING A COLUMN TEST

The objective of this work was to study the dynamic leaching behavior of thirty-three elements in municipal solid waste incinerator fly ash using a column test employing double deionized water. Nearly all of th e elements initially present in the leachate were found to leach quick ly and then decrease to near constant concentrations after five pore v olumes of water passed through the column. Of the eight elements subje ct to toxicity characteristic leaching procedure (TCLP) investigations , all except lead were found in concentrations below regulatory limits . After three pore volumes of water passed through the column, leachat e lead concentrations were found to have diminished to TCLP permissibl e levels. Concerning Resource Conservation and Recovery Act (RCRA) Tit le D regulations pertaining to permissible landfill leachate productio n, lead concentrations were still found at levels above allowable limi ts after as many as 40 pore volumes of leachate production.