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Table 2 Kinetic parameters during growth and PHA production by H. mediterranei using pre-treated (at pH 2.0 with 5.0 g activated carbon /100 ml raw vinasse) vinasse compared with those obtained previously by cultivating H. mediterranei in whey lactose

From: Utilization of vinasse for production of poly-3-(hydroxybutyrate-co-hydroxyvalerate) by Haloferax mediterranei

Cultivation PHA (g/l) PHA/CDW (%) μ max (1/h) q p (mg/g h) Y P/S Volumetric productivity (g/l h)
25% pre-treated vinasse 19.7 70 0.13 7.3 0.87 0.21
50% pre-treated vinasse 17.4 66 0.12 6.9 0.52 0.18
Whey lactose (Koller et al. [2008]) 12.2 73 0.10 150* 0.29** 0.09
Whey lactose (Koller et al. [2007]) 5.5 50 0.11 9.1 0.33** 0.05
  1. Time of growth using pre-treated vinasse was 96 h. Notations - μ max : maximum specific growth rate of H. mediterranei, qp: specific production rate of PHA, Y P/S : yield coefficient of PHA based on total carbohydrate in 25% pre-treated vinasse (22637 mg/L) and in 50% pre-treated vinasse (32935 mg/L). * Maximum value; ** in terms of whey sugars.
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