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Effects of temperature and pH on the kinetic growth of unialga Chlorella vulgaris cultures containing bacteria
Author(s) -
Mayo Aloice W.
Publication year - 1997
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143097x125191
Subject(s) - chlorella vulgaris , chemistry , saturation (graph theory) , enthalpy , kinetic energy , activation energy , nuclear chemistry , analytical chemistry (journal) , chromatography , organic chemistry , thermodynamics , algae , biology , botany , physics , mathematics , combinatorics , quantum mechanics
The kinetic growth of unialga Chlorella vulgaris was investigated in mixed‐culture fed‐batch chemosat 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 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, K H , and hydroxyl ion, K OH , were temperature‐dependent. At temperatures below optimum, K H increased when temperature increased, but K OH decreased. Above the optimum temperature, K H decreased and K OH increased with temperature.