| 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 |
|
