Table 3 Characteristics of pretreated CS, pretreatment solution after pretreatment and biogas slurry after ADa.
From: Enhancement of methane production from Cotton Stalk using different pretreatment techniques
Pretreatment | COD (mg·L−1) | Soluble saccharides (mg·L−1) | pH | TA (mgCaCO3·L−1) | TAN (mg·L−1) | TVFA (mg·L−1) | Cellulose (%) | Hemicellulose (%) | Total fiber (%) |
|---|---|---|---|---|---|---|---|---|---|
untreated | — | — | 7.66 | 6200 | 1310 | 0 | 50.42 ± 0.86 | 15.64 ± 0.03 | 82.38 ± 1.31 |
3% KOH | 13880 | 5110 | 7.36 | 4560 | 1095 | 0 | 56.65 ± 0.34 | 14.50 ± 0.02 | 90.64 ± 0.48 |
1.5% NaOH | 14220 | 4440 | 7.37 | 4300 | 1210 | 0 | 56.70 ± 0.06 | 14.80 ± 0.12 | 90.84 ± 0.10 |
1% Ca(OH)2 | 6120 | 920 | 7.50 | 5720 | 1265 | 0 | 53.29 ± 0.18 | 15.09 ± 0.21 | 85.97 ± 0.68 |
1% H2SO4 | 4300 | 980 | 7.65 | 5940 | 1340 | 0 | 54.25 ± 0.51 | 16.01 ± 0.43 | 87.66 ± 0.41 |
4% H3PO4 | 1340 | 150 | 7.66 | 5860 | 1215 | 0 | 52.81 ± 0.41 | 16.04 ± 0.09 | 86.20 ± 0.23 |
3% AHP | 5760 | 580 | 7.64 | 6160 | 1310 | 0 | 57.74 ± 0.72 | 15.52 ± 0.23 | 88.99 ± 0.44 |
SE-1.5 MPa 5 min | — | — | 7.67 | 7020 | 1775 | 0 | 46.80 ± 0.38 | 4.66 ± 0.75 | 69.98 ± 0.60 |
