Heavy metals (μg/L) Percent of Leachate in Incubation Medium
100% 50% 30% 20% 10%
Before After Before After Before After Before After Before After
Copper (Cu) 90 3 4 10 <1 <1 <1 <1 <1 <1
Chromium (Cr) 230 130 100 100 50 20 30 20 6 70
Lead (Pb) <12 <12 <10 <10 <10 <10 <10 <10 <10 <10
Nickel (Ni) 330 220 180 180 90 70 60 60 20 <3
Zinc (Zn) 5,580 3,540 2,900 2,900 1,640 690 1,170 120 670 <4
Table 4: Heavy metal removal from aerated GPL by Chlorella incubated in the light and under shaking conditions