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Table 2 Effect of operational parameters on volatile fatty acids production

From: Tequila vinasses acidogenesis in a UASB reactor with Clostridium predominance

HRT (h) Acetica (mg L−1) Propionica (mg L−1) Butyrica (mg L−1) Valerica (mg L−1) Isovalerica (mg L−1)
6 921.37 ± 18.62 (12) 783.03 ± 18.92 (12) 1,460.81 ± 19.09 (12) 375.78 ± 12.32 (12) 575.13 ± 21.46 (12)
12 866.94 ± 12.00 (29) 702.55 ± 12.19 (29) 1,131.95 ± 12.31 (29) 367.74 ± 7.94 (29) 536.30 ± 13.83 (29)
24 629.38 ± 23.95 (11) 453.61 ± 24.32 (11) 898.34 ± 24.56 (24) 265.73 ± 15.85 (11) 318.63 ± 27.60 (11)
36 593.57 ± 26.70 (5) 434.07 ± 27.12 (5) 722.87 ± 27.38 (5) 222.63 ± 17.67 (5) 211.95 ± 30.77 (5)
OLR (g COD L−1 d−1)
 5 700.11 ± 10.58 (31) 515.23 ± 10.75 (31) 970.73 ± 10.85 (31) 319.32 ± 7.00 (31) 421.89 ± 12.20 (31)
 10 716.13 ± 29.65 (4) 560.87 ± 30.12 (4) 1,038.39 ± 30.40 (4) 313.63 ± 19.62 (4) 393.10 ± 34.17 (4)
 15 873.36 ± 29.32 (7) 752.59 ± 29.78 (7) 1,123.09 ± 30.06 (7) 342.90 ± 19.40 (7) 588.47 ± 33.79 (7)
 20 725.39 ± 20.51 (9) 587.44 ± 20.82 (9) 1,004.84 ± 21.02 (9) 276.83 ± 13.57 (9) 361.65 ± 23.63 (9)
 30 749.08 ± 25.43 (6) 550.45 ± 25.83 (6) 1,130.41 ± 26.07 (6) 287.18 ± 16.83 (6) 287.40 ± 29.30 (6)
  1. aMean values are reported ± standard error, replicates for determination (n) are shown in parenthesis.