Environmental Engineering Reference
In-Depth Information
The presence of water soluble toxic elements in jarosite waste, CCRs and
other additives were studied under different extraction duration following the
leach test. The water soluble lead, cadmium and zinc content in jarosite waste,
CCRs and other additives such as marble processing residues (MPR) and clay
(RC) are shown Figure 7. Result revealed that the concentration of water
soluble Cr, Ag, As, Se, Ni, Pb, Cd, Zn were found to be higher in jarosite
waste than that of additives and concentration of all these elements was least
in clay soil. Solubility of Cr, Ag, Se, Ni, Pb, Cd, Zn in all wastes decreased
with increasing extraction duration. However, water soluble arsenic in jarosite
waste was significantly increased with extraction duration and the pH value
greatly influenced the metal solubility. Further details on the water soluble
toxic species in the jarosite waste and CCRs is reported elsewhere (Asokan,
2007).
10
Jarosite
CCRs
PCCRs
MPR
RC
8
6
4
2
0
6 Hrs
12 Hrs
18 Hrs
24 Hrs
Duration
(a)
60
50
Cadmium
Zinc
40
30
20
10
0
6 Hrs
12 Hrs
18 Hrs
24 Hrs
Duration
(b)
Figure 7. (a) Water soluble Pb in different waste; (b) Water soluble Cd and Zn in
jarosite waste.
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