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Table 2 Relative abundances of organic species identified by GC–MS in the HTLWW samples based on peak areas

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

Name 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
Acetic acid 5.90 4.21 4.18 2.93 3.62 3.82 2.42 4.98 4.12
3-Pentanol a 0.71 0.80 0.93 0.70 0.50 0.49 1.08 0.96
3-Methoxy-2-butanol 0.22 0.79
6-Methoxy-2-hexanol 0.35 0.74
Alcohols 1.28 2.32 0.93 0.70 0.50 0.49 1.08 0.96
2-Methylfuran 12.78 40.78 30.64 5.40 5.33 4.91 0.98 1.24 2.39
5-Methylfurfural 10.35 2.15 1.87 3.18 1.10 0.21 3.36 3.06 2.82
Furfural 23.13 42.93 32.51 10.46 7.19 2.57 57.04 47.86 33.33
2-Acetyl-5-methylfuran 1.53 1.10 1.27 1.01 0.94 1.05
5-Hydroxymethyl-2-furfural 5.31 4.40 7.73 5.68 6.60
Furans 46.25 85.87 70.33 24.98 14.71 8.95 70.12 58.79 46.19
Propanolone 2.56 5.89 4.63 0.99 0.54 5.26 4.49 5.47
Butanone 0.87 0.20 0.10 0.57 0.47 0.37
3-Hydroxy-2-butanone 2.18 2.08 1.74 1.71 1.40 4.92 3.65 5.92
2-Methyl cyclopentenone 7.39 12.19 6.45 1.83 1.66 2.63
3-Methyl cyclopentenone 2.07 3.65 7.64 0.99
2,3-Dimethyl cyclopentenone 1.54 4.51 4.27 0.49 0.53
2-Hydroxy-3-methyl cyclopentenone 2.32 4.05 4.00 1.05 1.68 1.88 3.35
2-Hydroxy-3-ethyl cyclopentenone 0.70 3.31 2.76 2.10 0.79 1.50 2.26
3-Ethyl cyclopentenone 1.35 1.58 3.15 0.62 0.75
2,3-Pentanedione 1.44 1.04 0.51 0.62 0.30
2,5-Hexanedione 2.79 5.55 4.94 2.97 2.13 2.04 3.36
3-Ethyl cycloheptanone 1.80 0.90 2.21 0.73
3-Octanone 1.33 0.98 1.03 0.88 0.77 1.07
1-Cyclopentyl-ethanone 1.29 1.13 1.00 0.53 0.67 0.88
1-(4-Hydroxy–3-methoxy-) acetophenone 0.92 0.57 0.75 1.01 0.84
1-(4-Hydroxy–3,5-dimethoxy-) acetophenone 2.68 2.70 2.13 1.16 1.91 1.55
1-(4-Hydroxy–3-methoxy-) propiophenone 1.27 0.83 1.16 0.82 1.29
4-Isopropyl- cyclohexenone 2.08 1.82 1.31 0.24 0.65
6-Methoxy-3-isopropyl-cyclohexanone 1.19 1.03 2.28 0.25
Ketones 4.74 13.79 46.48 47.54 41.57 15.76 29.35 33.18
Phenol 0.00 0.00 1.02 3.71 4.53 9.49 0.87 1.35 2.17
2-Methoxy-phenol 20.58 1.68 3.73 8.37 12.26 13.12 2.26 3.98 5.75
4-Ethyl-phenol 0.00 0.00 0.89 2.66 2.71 5.90 0.50 0.90 1.60
4-Ethyl-3-methoxy-phenol 15.84 1.29 1.59 3.08 3.16 3.20 1.19 2.77 2.71
2,6-Dimethoxy-phenol 11.44 0.93 2.15 5.87 9.87 12.60 1.34 2.48 3.26
2,4-Ditertiary butyl-phenol 0.00 0.00 0.00 0.98 0.89 0.87 0.55 0.84 0.06
Phenols 47.85 3.90 9.39 24.68 33.42 45.17 6.72 12.31 15.55
  1. HTLWW samples were diluted into the same COD concentration before analysis
  2. a“–” represents values below detection limit