Heavy metals (μg/L) Concentration of Chlorophyll a (μg/mL)
Before treatment 1.1 1.6 2.5 3
Copper (Cu) 1 <1 <1 <1 <1
Chromium (Cr) 40 9 8 8 10
Lead (Pb) <1 <1 <1 <1 <1
Nickel (Ni) 60 40 40 50 50
Zinc (Zn) 1850 80 10 130 90
Percentage removal of heavy metals
Copper (Cu)   97.75 80 80 75
Chromium (Cr)   Not detected Not detected Not detected Not detected
Lead (Pb)   Not detected Not detected Not detected Not detected
Nickel (Ni)   33.33 33.33 16.66 16.66
Zinc (Zn)   95.67 94.59 92.97 95.13
Table 6: Removal of heavy metals from 20% GPL with varying levels of Chlorella inoculation