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Table 7 Organic constitutions of condensates from the various stages of the gasification

From: Characterisation of the Contaminants Generated from a Large-Scale Ex-Situ Underground Coal Gasification Study Using High-Rank Coal from the South Wales Coalfield

Sample ID Unit S1 S2 S3 to S6 C3 (mix of S1 to S6) 30S1 30S2 30S3 C4 (mix of 30S1 to 30S6)
BOD-5 mg/L O2 129 ± 20 593 ± 89 610 ± 92 93 ± 14 97 ± 15 230 ± 34
Phenol index (aq) mg/L 36 ± 3 59 ± 5 33 ± 3 43.8 4.7 ± 0.4 1.8 ± 0.1 3.6 ± 0.3 0.5
Benzene μg/L 258 ± 65 257 ± 64 236 ± 59 250.1 1.37 ± 0.34 342 ± 86 202 ± 50 200.9
Toluene μg/L 231 ± 58 211 ± 53 163 ± 41 200 4.71 ± 1.18 251 ± 63 168 ± 40 155.3
Ethylbenzene μg/L 43.5 ± 11.0 9.31 ± 2.33 5.29 ± 1.32 17.26 0.67 ± 0.17 4.12 ± 1.0 5.83 ± 1.50 3.769
m,p-xylene μg/L 281 ± 70 87.4 ± 21.90 55.5 ± 13.9   1.64 ± 0.40 57.7 ± 14 73.4 ± 18
o-xylene μg/L 103 ± 26 22.4 ± 5.6 14.4 ± 3.6 170.9 (total xylene) 6.91 ± 1.73 13.1 ± 3.3 11.3 ± 2.9 47.83 (total xylene)
Total BTEX μg/L 917 ± 230 587 ± 147 474 ± 119 467 15.3 ± 3.83 668 ± 167 461 ± 115 360
Naphthalene (NaP) μg/L 2570 ± 640 1870 ± 468 2240 ± 560 2188 210 ± 50 568 ± 140 1260 ± 315 10.79
Acenaphthene (AcP) μg/L 44.5 ± 11.0 24.5 ± 6.1 19.8 ± 5.0 28.35 1.31 ± 0.33 6.04 ± 1.50 47.7 ± 12.0 418.8
Fluorene (Flu) μg/L 462 ± 116 411 ± 103 444 ± 111 436.2 46.3 ± 11.6 58.9 ± 14.7 386 ± 95 708.8
Phenanthrene (Phe) μg/L 937 ± 234 983 ± 246 1420 ± 355 1120 103 ± 25 214 ± 55 852 ± 213 19.11
Anthracene (AnT) μg/L 121 ± 30 118 ± 30 130 ± 33 122.9 7.38 ± 1.9 10.8 ± 2.7 71.9 ± 18 168.2
Fluoranthene (Fla) μg/L 291 ± 73 228 ± 57 250 ± 63 252.7 11.2 ± 2.8 30.2 ± 7.6 45.7 ± 11.0 403.6
Pyrene (Pyr) μg/L 140 ± 35 102 ± 25 113 ± 28 116.1 5.34 ± 1.34 11.6 ± 2.9 9.05 ± 2.3 30.92
Benzo(a)anthracene (BaA) μg/L 119 ± 30 102 ± 25 110 ± 28 109.4 1.05 ± 0.26 2.08 ± 0.50 0.74 ± 0.20 30.36
Chrysene (Chr) μg/L 190 ± 48 180 ± 45 177 ± 44 181.7 2.49 ± 0.62 3.55 ± 0.90 2.35 ± 0.60 9.015
Benzo(b)fluoranthene (BbF) μg/L 203 ± 50 175 ± 44 178 ± 45 183.7 0.74 ± 0.20 0.81 ± 0.20 0.69 ± 0.18 1.337
Benzo(k)fluoranthene (BkF) μg/L 36.3 ± 9.0 31.4 ± 7.9 30.4 ± 7.6 32.39 0.26 ± 0.07 0.22 ± 0.06 < 0.05 2.847
Benzo(a)pyrene (BaP) μg/L 53.8 ± 13.5 42.3 ± 10.6 44.5 ± 11.1 46.19 0.11 ± 0.03 0.42 ± 0.10 0.13 ± 0.03 0.7495
Dibenzo(a,h)anthracene (DBA) μg/L 127 ± 32 103 ± 25.8 52.6 ± 13.2 92.29 0.29 ± 0.07 < 0.05 < 0.05 0.1723
Benzo(g,h,i)perylene (BghiP) μg/L 79.3 ± 20 61.1 ± 15.3 46.1 ± 11.5 60.95 < 0.05 < 0.05 0.09 ± 0.02 0.2356
Indeno(1,2,3-cd)pyrene (IND) μg/L 22.0 ± 5.5 26.1 ± 6.5 25.9 ± 6.5 24.91 < 0.05 < 0.05 < 0.05 0.1154
Total PAH μg/L 5390 ± 1350 4460 ± 1115 5280 ± 1320   389 ± 97 907 ± 227 2680 ± 670
BOD-5 mg/L 129 ± 20 593 ± 89 610 ± 92   93 ± 14 97 ± 15 230 ± 34