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Table 3 Final yields and productivities of molasses fermentation in terrestrial and marine PBBRs

From: Efficient molasses fermentation under high salinity by inocula of marine and terrestrial origin

PBBR Fermentation Methanogenesis Biomass COD balance
\(\frac{\text{VFA}_{\text{IN}}}{{\text{COD}}_{\text{IN}}}\) \(\frac{\text{VFA}_{\text{OUT}}}{{\text{COD}}_{\text{OUT}}}\) COD to VFAs YVFA VFAs prod. CH4 production Yields VSS Fed Removed COD tracked
gCOD L−1 d−1 mL L−1 d−1 gCOD L−1 d−1 \(\text{L}_{\text{CH}_{4}}\) g COD −1 removed gCOD L−1 d−1 gCOD L−1 d−1 gCOD L−1 d−1 %
Terrestrial
 OLR 5
  Mean 1.07 61.1 52.6 79.6 2.47 211.3 0.60 0.341 2.94 4.70 0.62 6.01 127.8
  SD 0.16 4.6 5.6 7.0 0.56 2.6 0.01   0.68 0.58 0.22   
 OLR 10
  Mean 1.38 74.7 66.7 85.8 6.77 362.7 1.04 0.324 3.40 9.82 1.12 11.21 114.2
  SD 0.96 9.6 9.3 8.0 3.15 2.4 0.01   1.17 3.42 0.79   
  1. Mean and standard deviations refer to the last 10 days of operation. Conversion yields were assessed as indicated in Calculations, in “Methods” section. VSS in the effluent were considered as estimates of biomass production. Y VFA is typically higher than COD to VFAs yield as in the former the COD in the outlet not converted to VFAs is not considered. While the former is an indication of the specific microbial activity, the COD to VFAs yield is a process parameter
Marine
 OLR 5
  Mean 0.95 60.8 59.5 102.3 2.36 114.9 0.33 0.280 2.33 4.90 0.41 5.02 102.5
  SD 0.23 7.7 7.2 27.5 0.56 8.0 0.02   0.62 2.14 0.32   
 OLR 10
  Mean 1.20 66.8 60.3 87.8 5.89 299.3 0.86 0.374 3.61 9.80 0.80 10.36 105.7
  1. Mean and standard deviations refer to the last 10 days of operation. Conversion yields were assessed as indicated in Calculations, in “Methods” section. VSS in the effluent were considered as estimates of biomass production. Y VFA is typically higher than COD to VFAs yield as in the former the COD in the outlet not converted to VFAs is not considered. While the former is an indication of the specific microbial activity, the COD to VFAs yield is a process parameter