Table 2.
Basic characteristics of waste sludge streams and mixed sludge samples.
| Waste Sludge Sample | Parameter | |||||
|---|---|---|---|---|---|---|
| pH (-) | TS (% w/w) | VS (% w/w) | VS/TS (%) | |||
| Thickened waste activated sludge | 6.15 (0.20; 5) a |
3.93 (0.48; 12) |
3.18 (0.40; 12) |
80.9 | ||
| Fermented primary sludge | 5.27 (0.15; 5) |
7.10 (0.96; 12) |
6.47 (0.89; 12) |
91.1 | ||
| Mixed sludge | Un-pretreated | 5.63 (0.13; 5) |
3.94 (0.24; 16) |
3.38 (0.20; 16) |
86.0 | |
| Pretreated | MW_80 °C | 5.64 (0.05; 5) |
3.40 (0.35; 16) |
2.90 (0.33; 16) |
85.3 | |
| MW_160 °C | 5.52 (0.20; 5) |
3.37 (0.25; 16) |
2.87 (0.24; 16) |
85.2 | ||
TS: total solids, VS: volatile solids, MW: microwave. a Data displays the arithmetic mean of measurements (standard deviation; number of data points).