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This paper characterizes the strain Chlorella sorokiniana UTEX 1230 within a laboratory setting using a 1 L bubble column. The findings show that productivity can be trebled under mixotrophic conditions (from 0.2 g&amp;middot;L &amp;minus;1 &amp;middot;d &amp;minus;1 to 0.66 g&amp;middot;L &amp;minus;1 &amp;middot;d &amp;minus;1 ) with the addition of sodium acetate. The results also indicate that both the growth rate and final yield increase with the cultivation temperature, with most parameters showing an optimum in the range of 30&amp;ndash;35 &amp;deg;C. The maximum specific growth rate was found to be in the region of 0.12 h &amp;minus;1 at a surface irradiance between 100&amp;ndash;500 &amp;micro;E&amp;middot;m &amp;minus;2 &amp;middot;s &amp;minus;1 . This high growth rate makes the strain particularly suited to the rapid production of biomass, suitable for either whole cell bioprocessing or bioremediation. However, the relatively low lipid productivity (9.2 mg&amp;middot;L &amp;minus;1 &amp;middot;d &amp;minus;1 ) confirms previous findings which would indicate poor applicability for biodiesel production. The strain shows greater promise in wastewater treatment applications with removal rates of nitrogen and phosphorus in the region of 37 and 30 mg&amp;middot;L &amp;minus;1 &amp;middot;d &amp;minus;1 respectively. Furthermore, the findings show that a fed-batch strategy to inorganic nutrient loading can increase the final yield by around 50% compared to a conventional batch run. This is particularly interesting as fed-batch production techniques are rarely used within microalgal cultivation, so provide an interesting avenue for further investigation. Overall, the findings show that C. sorokiniana UTEX 1230 is a robust and fast-growing microalgal strain suitable both for the laboratory and scale-up.

Characterization of Chlorella sorokiniana, UTEX 1230