Serial Number |
Metal contaminant |
Units |
Specified concentration for
use as agricultural fertilizer |
Measured concentration in in-house
compost |
Measured concentration in STP sludge compost |
1 |
Arsenic |
mg/Kg |
10 |
3.77 |
3.00 |
2 |
Cadmium |
mg/Kg |
5 |
0.65 |
0.84 |
3 |
Mercury |
mg/Kg |
0.15 |
0.67 |
1.39 |
4 |
Lead |
mg/Kg |
100 |
13.18 |
18.01 |
5 |
Chromium |
mg/Kg |
50 |
10.61 |
14.15 |