Table 1 The main characteristics of the substrates.
Parameter | Concentrated WASa,b | Pretreated WASa,b | Autoclaved-alkaline | Thermal-alkaline | ||
|---|---|---|---|---|---|---|
Liquid | Straw | Liquid | Straw | |||
pH | 6.68~6.90 | 6.62~6.76 | 6.62~6.76 | 6.62~6.76 | 9.39~9.51 | 7.71~7.88 |
TSS | 24390 ± 1320 | 22930 ± 820 | 24510 ± 468 | 27880 ± 727 | 23040 ± 794 | 29690 ± 482 |
VSS | 16160 ± 980 | 15260 ± 1140 | 14540 ± 577 | 12343 ± 372 | 14290 ± 760 | 19930 ± 985 |
SCOD | 232 ± 27 | 4290 ± 192 | 13371 ± 811 | 7785 ± 838 | 7362 ± 1012 | 6897 ± 996 |
TCOD | 25420 ± 641 | 26930 ± 314 | 19660 ± 1463 | 20843 ± 1672 | 28460 ± 1455 | 31580 ± 4198 |
VFAs (as COD) | 69 ± 6 | 805 ± 17 | 2552 ± 997 | 1524 ± 572 | 596 ± 112 | 989 ± 37 |
Soluble carbohydrates (as COD) | 89 ± 7.6 | 412 ± 22 | 1631 ± 82 | 603 ± 116 | 1499 ± 112 | 1012 ± 79 |
Soluble proteins (as COD) | 110 ± 17.2 | 3130 ± 419 | 6950 ± 601 | 3675 ± 374 | 10930 ± 869 | 11525 ± 599 |
