Removal of heavy metals from contaminated foundry sand through repeated soil-washing

Figures & data

Figure 1. Close up photos of industrial FS

Table 1. Concentrations of heavy metals in the leachates of initial washing, and after 10 & 25 cycles of washing

	Chromium (mg/L)	Copper (mg/L)	Lead (mg/L)	Zinc (mg/L)
Initial leachate	1.213	2.327	0.143	1.573
Leachate after 10 cycles of washing	0.225	1.22	0.069	0.587
Leachate after 25 cycles of washing	0.061	0.121	0.017	0.126

Figure 2. Continuous leaching characteristics of Chromium

Figure 3. Continuous leaching characteristics of Copper

Figure 4. Continuous leaching characteristics of Lead

Figure 5. Continuous leaching characteristics of Zinc

Figure 6. Comparison of best-fit lines of continuous leaching behaviours of chromium, copper, lead and zinc

Figure 7. Effect of depth on concentrations of heavy metals in leachate