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Table 3 Summary of typical organics in COD values of different HTLWW samples

From: Methane potentials of wastewater generated from hydrothermal liquefaction of rice straw: focusing on the wastewater characteristics and microbial community compositions

Name mg/g COD 170 °C–0.5 h 200 °C–0.5 h 230 °C–0.5 h 260 °C–0.5 h 290 °C–0.5 h 320 °C–0.5 h 200 °C–1 h 200 °C–2 h 200 °C–4 h
Lactic acid 9.25 ± 2.79 17.19 ± 3.11 89.48 ± 2.78 71.56 ± 8.99 88.87 ± 12.07 94.37 ± 3.25 41.72 ± 4.09 96.22 ± 14.78 91.00 ± 2.89
Acetic acid 5.46 ± 1.91 48.011 ± 9.02 80.04 ± 4.01 81.96 ± 1.78 106.34 ± 2.12 139.9 ± 4.01 47.59 ± 5.84 109.70 ± 2.13 96.95 ± 2.79
Propionic acid 2.47 ± 1.20 2.47 ± 0.01 5.39 ± 0.78 7.81 ± 1.98 13.37 ± 2.01 18.08 ± 0.02 3.36 ± 1.99 6.37 ± 2.05 6.53 ± 0.33
Isobutyric acid a 1.27 ± 0.65 1.17 ± 0.89 1.44 ± 1.78 1.86 ± 0.12 2.34 ± 1.03 1.82 ± 1.16 1.53 ± 1.89
N-Butyric acid 0.94 ± 0.02 1.53 ± 0.89 1.93 ± 0.79 3.51 ± 2.09 4.69 ± 2.56 1.12 ± 0.87 2.03 ± 1.13 1.84 ± 0.68
Isovaleric acid 2.73 ± 1.91 1.27 ± 1.78 1.38 ± 1.12 1.69 ± 0.91 1.68 ± 1.05
Pentanoic acid 1.17 ± 1.01 1.64 ± 0.65 1.21 ± 1.03 2.17 ± 0.78 1.84 ± 1.69
Sugars 383.26 ± 22.91 454.00 ± 56.08 174.65 ± 33.18 65.06 ± 3.82 30.57 ± 12.23 21.50 ± 0.17 323.40 ± 17.39 213.90 ± 22.90 107.10 ± 12.01
Total (in COD) 403.20 ± 30.72 524.00 ± 68.89 353.40 ± 43.54 232.7 ± 21.57 245.90 ± 31.76 282.50 ± 11.95 418.00 ± 14.26 432.01 ± 44.93 308.40 ± 33.49
  1. a“–” represents values below detection limit and the detection limit was 0.01 mg/L for all the measured fatty acids