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Percentage contributions of chemical classes in the tested biosolid samples
| Chemical classes | Primary sludge (%) | Waste-activated sludge (%) | Digested sludge (%) | Dewatered sludge (%) |
|---|---|---|---|---|
| Sulfur compounds | 28 | 9 | 7 | 25 |
| Aromatic hydrocarbons | 16 | 12 | 14 | 19 |
| Aldehydes | 10 | 9 | 11 | 6 |
| Ketones | 9 | 20 | 11 | 9 |
| Aliphatic hydrocarbons | 9 | 20 | 25 | 16 |
| Alcohols | 19 | 21 | 18 | 16 |
| Others | 9 | 9 | 14 | 9 |
