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Table 1 Effect of operational parameters on reactor performance

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

HRT (h) VGPRa (Lgas L −1reactor d−1) PHa COD removal (%)a Aciditya (mg CaCO3 L−1) Alkalinitya (mg CaCO3 L−1)
6 1.09 ± 0.16 (25) 6.48 ± 0.06 (25) 36.04 ± 4.00 (12) 3,994.81 ± 183.29 (25) 282.54 ± 17.73 (25)
12 1.16 ± 0.12 (40) 6.57 ± 0.04 (40) 44.66 ± 2.72 (24) 4,120.14 ± 133.82 (40) 323.58 ± 12.94 (40)
24 1.62 ± 0.22 (16) 6.61 ± 0.07 (16) 54.26 ± 5.08 (10) 4,331.12 ± 242.05 (16) 337.73 ± 23.41 (16)
36 1.49 ± 0.23 (10) 6.72 ± 0.08 (9) 63.47 ± 5.64 (10) 3,615.65 ± 265.74 (9) 351.31 ± 25.71 (9)
OLR (g COD L−1d−1)
 5 0.91 ± 0.09 (55) 6.81 ± 0.03 (56) 55.05 ± 2.21 (30) 3,141.45 ± 103.10 (55) 293.92 ± 9.98 (55)
 10 1.02 ± 0.28 (6) 6.85 ± 0.10 (5) 61.15 ± 6.19 (4) 3,135.29 ± 335.92 (5) 312.21 ± 32.49 (5)
 15 0.90 ± 0.28 (9) 6.31 ± 0.09 (8) 31.86 ± 6.32 (6) 4,770.97 ± 311.63 (9) 331.12 ± 30.15 (9)
 20 1.69 ± 0.18 (15) 6.71 ± 0.06 (15) 60.55 ± 4.47 (8) 3,592.49 ± 207.14 (15) 331.50 ± 20.04 (15)
 30 2.18 ± 0.28 (6) 6.29 ± 0.10 (6) 39.43 ± 6.95 (3) 5,436.95 ± 311.53 (6) 350.21 ± 30.14 (6)
  1. aMean values are reported ± standard error, replicates for determination (n) are shown in parenthesis.