Application of a Yeast Biosurfactant in the Removal of Heavy Metals and Hydrophobic Contaminant in a Soil Used as Slurry Barrier

Table 5

Release of metals from test specimens before and after percolation of the fluids.

Heavy metals	Quantification of heavy metals in the test specimens
	Soil (g/kg)	S-WO-B^a (g/kg)		S-SL^b (g/kg)		S-SL-B^c (g/kg)
		Inflow	Outflow	Inflow	Outflow	Inflow	Outflow
Fe	52.500±0,02	51.705±0,02	43.850±0,03	48.075±0,01	48.080±0,02	44.500±0,03	40.985±0,02
Cd	0.0009±0,02	0.0012±0,01	0.0006±0,02	0.0010±0,03	0.0010±0,02	0.0005±0,01	0.0007±0,01
Zn	0.0191±0,02	0.0147±0,02	0.1485±0,01	0.0144±0,02	0.0144±0,01	0.3616±0,02	0.0137±0,02
Cu	0.0133±0,02	0.0128±0,03	0.0154±0,02	0.0076±0,01	0.0041±0,01	0.1615±0,02	0.0051±0,02
Pb	0.0140±0,02	0.0120±0,02	0.0140±0,01	0.0150±0,02	0.0130±0,02	0.0130±0,01	0.0170±0,01

S-WO-B^a: soil resulting from the mixture of soil and waste oil, percolated by the biosurfactant; S-SL^b: soil percolated by the slurry; S-SL-B^c: soil percolated by the slurry followed by the biosurfactant.