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Effects of dissolved inorganic carbon and nutrient levels on carbon fixation and properties of Thermosynechococcus sp. in a continuous system

Su, Chih Ming, Hsueh, Hsin Ta, Chen, Hsing Hui, Chu, Hsin
Chemosphere 2012 v.88 no.6 pp. 706-711
Cyanobacterium, Thermosynechococcus, buffers, carbon, carbon dioxide, continuous systems, greenhouse gases, nutrient content, pH, scrubbers, sodium hydroxide
The concept of CO₂ chemo-absorption by sodium hydroxide in a wet scrubber followed by microalgae cultivation was used as a means to reduce the major greenhouse gas. A thermophilic and alkaline tolerable cyanobacterium named Thermosynechococcus CL-1 (TCL-1) was cultivated in continuous system, with a carbonate–bicarbonate buffer as carbon source. The effects of dissolved inorganic carbon (DICᵢₙ) and nutrient levels in influent on cell mass productivity, DIC removal efficiency, and alkaline solution regeneration by TCL-1 were investigated. The results show the highest cell mass productivity reaches 1.7gL⁻¹d⁻¹ under the highest DIC and nutrients level. Conversely, the best regeneration of alkaline solution proceeds from pH 9.5 to 11.3 under the lowest level. In addition, the highest ΔDIC (DIC consumption) and DIC removal efficiency are 42mM and 43% at 113.2 and 57mM DICᵢₙ, respectively.