Table 1 Paper mill’s sludge characteristics
Sample | Origin | Color | pH | T °C |
|---|---|---|---|---|
Primary sludge (IS) | Discharges from pulp processing which are rich in cellulose-fiber and undergo settling, solid state | Dark brown | 7.2 | 37 |
Secondary sludge (IIS) | Decantation of primary sludge, undergo another physical settling, solid state | Dark brown | 7.0 | 30 |
Press sludge (PS) | Mixture of secondary and primary sludge, solid state | Dark brown | 3.0 | 35 |
Machine samples (MS) | Environmental samples found around machine in the mill, solid state | Light brown | 7.2 | 37 |