Effects of Temperature and pH on the Kinetic Growth of Unialga Chlorella vulgaris Cultures Containing Bacteria

The kinetic growth of unialga Chlorella vulgaris was investigated in mixed-culture fed-batch chemostat reactors, with special reference to temperature and pH. The experiments were carried out at 10°C to 40°C, pH was controlled from 3.0 to 11.5 in a series of reactors, and glucose at a concentration...

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Veröffentlicht in:Water environment research 1997-01, Vol.69 (1), p.64-72
1. Verfasser: Mayo, Aloice W.
Format: Artikel
Sprache:eng
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Zusammenfassung:The kinetic growth of unialga Chlorella vulgaris was investigated in mixed-culture fed-batch chemostat reactors, with special reference to temperature and pH. The experiments were carried out at 10°C to 40°C, pH was controlled from 3.0 to 11.5 in a series of reactors, and glucose at a concentration of 75 mg/L was fed as the sole source of organic carbon. The maximum growth rate of 0.50$\text{day}^{-1}$was obtained at pH of about 6.31 to 6.84, and the optimum temperature was 32.4°C. The activation energy of the growth-limiting reaction and the enthalpy change for the enzyme-inactivation reaction were 24.5 and 253.36 kJ/mole, respectively. The saturation constants for hydrogen ion,${\rm K}_{{\rm H}}$, and hydroxyl ion,${\rm K}_{{\rm OH}}$, were temperature-dependent. At temperatures below optimum,${\rm K}_{{\rm H}}$increased when temperature increased, but${\rm K}_{{\rm OH}}$decreased. Above the optimum temperature,${\rm K}_{{\rm H}}$decreased and${\rm K}_{{\rm OH}}$increased with temperature.
ISSN:1061-4303
1554-7531
DOI:10.2175/106143097X125191