Table 2 Physico-chemical parameters of sludges measured after 23 days of anaerobic digestion
Name | TS (% FW w/v) | VS (% FW w/v) | pH | TAN (mg L−1) | Acetate (mM) | Propionate (mM) | CH4 (Nml gVS−1) |
|---|---|---|---|---|---|---|---|
WR37 | 7.74 (0.13) a | 5.44 (0.08) a | 7.81 (0.02) a | 1533 (44.1) ab | 0.13 (0.13) | nd | 116 (7.51) a |
WR37au | 7.34 (0.07) ac | 5.27 (0.05) a | 8.16 (0.02) b | 1867 (136) b | nd | nd | 165 (2.08) ab |
WR37us | 6.35 (0.07) b | 4.53 (0.05) b | 8.04 (0.01) b | 1250 (50.0) a | 0.04 (0.04) | nd | 195 (4.42) ab |
WR37al | 6.10 (0.08) bd | 4.17 (0.07) d | 8.11 (0.01) b | 1350 (132) a | 0.57 (0.46) | 0.25 (0.25) | 139 (12.4) ab |
WR37mo | 6.95 (0.14) c | 4.86 (0.06) c | 7.82 (0.04) a | 1367 (183) ab | nd | nd | 137 (36.2) ac |
WR37en | 6.09 (0.18) bd | 4.20 (0.08) d | 7.79 (0.06) a | 1433 (44.1) ab | 0.10 (0.05) | nd | 203 (23.3) bc |
WR37us+en | 5.63 (0.04) d | 3.99 (0.03) d | 7.64 (0.01) c | 1417 (60.1) ab | nd | nd | 222 (5.04) b |
PR37 | 7.87 (0.02) a | 4.74 (0.03) a | 7.82 (0.02) a | 1800 (50.0) a | 0.12 (0.07) | nd | 323 (4.96) a |
PR37au | 7.61 (0.26) a | 4.67 (0.21) a | 8.15 (0.02) b | 1683 (174) ab | nd | nd | 331 (8.53) a |
PR37us | 7.25 (0.25) a | 4.62 (0.13) a | 8.00 (0.01) c | 1650 (104) ab | 0.03 (0.03) | nd | 400 (7.30) b |
PR37al | 6.06 (0.16) bc | 3.57 (0.13) b | 8.06 (0.02) c | 1567 (267) ab | 0.49 (0.24) | 1.17 (0.62) | 202 (17.8) c |
PR37mo | 7.17 (0.07) a | 4.23 (0.05) ac | 7.79 (0.01) a | 1567 (44.1) ab | 0.07 (0.04) | nd | 324 (5.73) a |
PR37en | 6.38 (0.05) b | 3.81 (0.02) bc | 7.66 (0.01) d | 1500 (50.0) ab | 0.03 (0.03) | nd | 351 (2.79) a |
PR37us+en | 5.54 (0.03) c | 3.41 (0.03) b | 7.59 (0.02) e | 1067 (16.7) b | nd | nd | 408 (8.37) b |
WR55 | 3.81 (0.30) | 2.48 (0.22) | 8.30 (0.03) | 1550 (76.4) | nd | 1.65 (1.30) | 171 (6.01) |
PR55 | 2.91 (0.02) | 1.77 (0.05) | 8.31 (0.04) | 1567 (44.1) | 1.11 (0.35) | 6.75 (0.66) | 368 (7.89) |