| Summary: | 碩士 === 東海大學 === 環境科學與工程學系 === 99 === Due to the climate change, the atmospheric CO2 is considered to be one of the main causes of global warming. Microalgae based wastewater treatment also releases CO2 but the microalgae consume more CO2 while growing than traditional wastewater treatment plants. The microalgae incorporated photobioreactor is a highly efficient biological system for converting CO2 into biomass. In this study, the packed tower with the sodium hydroxide solution and dairy wastewater was taken as an absorber to absorb CO2 continuously, and used these absorbed CO2 solution to incubate microalage. In the beginning, the basic incubated experiment show the dilution rate of renewable inoculation was 20%, and the initial appropriate NaHCO3 and NH4NO3 concentration of Spirulina maxima culture medium were 16 g/L and 0.3 g/L, respectively. The result indicated that 1 g CO2 could produce 0.23 g microalgal biomass. In packed tower, the best liquid/gas ratio was 0.06, and the best CO2 removal efficiency was 73% by 0.1 M NaOH solution absorbing air. Finally, the best CO2 removal efficiency was 59% by dairy wastewater with 1M NaOH solution absorbing 10% CO2. The wastewater treatment efficiency occurred after 8 days was measured at 80%, 62%, 52%, 6%, 31% for COD, BOD, NH4+, NO3- and PO43-, respectively. This suggested that Spirulina maxima could be incubated in absorbing CO2 wastewater, which can remove wastewater nutrient and fixate CO2, simultaneously.
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