Table 2.

Combination of populations used in the butyrate degradation batch experiment

Expt no.Digester inoculum vol (ml)Formate enrichment vol (ml)Acetate enrichment vol (ml)Anaerobic medium (ml)Initial formate activity (mg/liter · h)Acetate activitya υmax_A(mg/liter · h)Fittedaυmax_B(mg/liter · h)Estimatedbυmax_B (mg/liter · h)
11045214.516.113.4
22035427.017.316.7
330256310.522.620.7
4201025598.317.719.0
5202015777.618.020.1
620305949.222.222.6
72010254313.220.220.5
82020154518.724.223.9
9203054626.529.428.7
1020102056220.127.226.3
1120201057814.925.824.5
  • a The butyrate and acetate activities are best-fit parameters obtained with equations 1 and 2.

  • b Estimated υmax_B = 16.72 + 0.5937 × (υmax_A − 6.97) + 0.0867 × (formate activity − 42).