Preliminary Examination of the System Fly Ash-Bottom Ash-Flue Gas Desulphurization Gypsum-Portland Cement-Water for Road Construction

Table 5

Results of the batch leach test and regulatory limits for the determined elements.

Specimen	Leachate concentration (mg/dm^3)
	Cu	Zn	Cd	Pb	Ni	Sb	Cr
S1 after 7 days	<0.1	0.4	0.5	5	1	3	<0.1
S1 after 28 days	<0.1	0.1	0.6	4	3	19	0.5
S2 after 7 days	<0.1	0.4	0.4	6	1	3.4	<0.1
S2 after 28 days	<0.1	0.5	0.5	6	2	22	0.3
WAC	Stable nonreactive hazardous waste in a nonhazardous landfill
	5	5	0.1	1	1	0.07	1
	Hazardous waste landfill
	10	20	0.5	5	4	0.5	7

S₁ made from the mixture: 18.6% FA-6.2% PC-6.2% FGD gypsum-31% BA-38% W, FA composed of particles of <1.652 mm.
S₂ made from the mixture: 18.6% FA-6.2% PC-6.2% FGD gypsum-31% BA-38% W, FA composed of particles of <0.42 mm.