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