| Summary: | 碩士 === 大葉大學 === 環境工程學系碩士班 === 98 === A microalgal strain which is able to grow under basic conditions was screened from pond water. This strain was then cultivated in media containing sodium bicarbonate or sodium carbonate to simulate the solutions from alkaline absorption proussls for carbon dioxide. Batch cultivations were used to investigate the effects of pH and total carbonate ion concentration on the grow of this strain and the utiligation of carbon source. Bath experiments e=were conducted under a light intensity of 10000 lux with initial pH of7.3, 8, 9 and 10, and with initial total carbonate in concentrations of 0.036 and 0.072 M.
With the initial total carbon ion concentration of 0.036 M, the highest utiligation percentage of carbon source was accurred in the cufture with initial pH of 9, and the average daily consumption rate of carbon was 145.63 mg of CO2 per day. The average daily consumption rate of carbon souru was 36.37 mg of CO2 per day in the culture with initial pH of 10. The highest biomass concentration of 0.831 g was also obtained in the culture with initial pH of 9.
With the initial total carbonate ion concentration of 0.072 M , the highest average daily consumption rate of carbon source was 286.35 ng of CO2 per day, in the culture with initial pH of 8.
The lowest average daily consumption rate was 133.20 mg of CO2 per day with initial pH of 9. The highest biomass concentration of 0.865 g was obtained in the culture with initial pH of 7.
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