Abstract
Haloferax mediterranei is an extremely halophilic archaeon that is able to synthesize polyhydroxyalkanoate (PHA) in high salt environment with low sterility demand. In this study, a mathematical model was validated and calibrated for describing the kinetic behavior of H. mediterranei at 15, 20, 25, and 35 °C in synthetic molasses wastewater. Results showed that the production of PHA by H. mediterranei, ranging from 390 to 620 mg h−1 L−1, was strongly dependent on the temperature. The specific growth rate (µ max), specific substrate utilization rate (q max), and specific decay rate (k d) of H. mediterranei increased with temperature following Arrhenius equation prediction. The estimated activation energy was 58.31, 25.59, and 22.38 kJ mol−1 for the process of cell growth, substrate utilization, and cell decay of H. mediterranei, respectively. The high temperature triggered the increased PHA storage even without nitrogen limitation. Thus, working at high temperatures seems a good strategy for improving the PHA productivity of H. mediterranei.
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Abbreviations
- k d :
-
Biomass specific decay rate (h−1)
- K S :
-
Half-saturation coefficient of carbon source (mg COD L−1)
- K N :
-
Half-saturation coefficient of nitrogen source (mg N L−1)
- q S :
-
Biomass specific substrate utilization rate (h−1)
- q PHA :
-
Biomass specific PHA production rate (h−1)
- q max :
-
Maximum biomass specific substrate utilization rate, h−1
- S S :
-
Substrate concentration (mg COD L−1)
- S N :
-
Ammonium nitrogen concentration (mg N L−1)
- XB :
-
Biomass concentration (mg COD L−1)
- XPHA :
-
PHA concentration (mg COD L−1)
- XPHB :
-
PHB concentration (mg COD L−1)
- XPHV :
-
PHV concentration (mg COD L−1)
- Y∆PHA/∆S :
-
PHA yield (mg COD mg−1 COD)Y∆X/∆S Growth yield based on COD consumption (mg COD mg-1 COD)
- Y∆X/∆N :
-
Growth yield based on nitrogen consumption (mg COD mg−1 N)
- µ max :
-
Maximum biomass specific growth rate (h−1)
- µ :
-
Biomass specific growth rate (h−1)
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Acknowledgments
This research is supported by the National Natural Science Foundation of China (Project Nos. 51478011 and 51178004), the Beijing Natural Science Foundation of Beijing (No. 8132013).
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Fig. S1
Arrhenius plot of µ 0 (filled black square) and q s0 (filled black triangle). (DOC 86 kb)
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Cui, YW., Zhang, HY., Ji, SY. et al. Kinetic Analysis of the Temperature Effect on Polyhydroxyalkanoate Production by Haloferax mediterranei in Synthetic Molasses Wastewater. J Polym Environ 25, 277–285 (2017). https://doi.org/10.1007/s10924-016-0807-2
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DOI: https://doi.org/10.1007/s10924-016-0807-2