Abstract
This study evaluates the performance of alkaliphilic microalgae Ankistrodesmus falcatus in the Bicarbonate-based Integrated Carbon Capture and Algae Production System (BICCAPS). The system utilized bicarbonate as carbon source for microalgae production. BICCAPS parameters such as pH, algal biomass productivity and CO2 utilization (inorganic carbon conversion, Ci) were observed at different sodium bicarbonate (NaHCO3) loading concentration and type of culture media. The highest productivity was observed at 10 g/L of NaHCO3 loading in BRSP medium at 3.5539 mg/L/day. This value is 30% lower compared to the control experiment (continuously aerated bioreactor). The Ci values of the different system ranges from 1.17 x 10-4 to 1.51 x 10-4 moles/L/day. Both the pH of the BRSP and NPK media at 10 g/L and 30g/L loading of NaHCO3 increased through time. The result shows that A. falcatus has a potential in BICCAPS utilization.
Highlights
The increasing level of carbon dioxide (CO2) in the atmosphere had caused severe impact in global temperature
It was determined that the umax for A. falcatus are 0.0515 /day and 0.0349 /day for BRSP media and NPK media, respectively
These results indicates that BRSP is the more favourable growth media for A. falcatus
Summary
The increasing level of carbon dioxide (CO2) in the atmosphere had caused severe impact in global temperature. In CCS system, the CO2 gas is captured in an amine-based or carbonate-based adsorbents and stored in a vessel as compressed gas and transported to a place where it could have negligible effect on the environment [3] Still, these technologies are energy intensive because of the thermal treatment required to regenerate the absorbents rendering it to be expensive [4]. The popularity of microalgae as CCS is due to high growth rate and capture carbon capability on top of that it could be used as a potential fuels source. One of the several microalgae that has been evalauted as biofuel feedstock is Ankistrodemus falcatus [7,8,9] Study for it as potential for CCS were limited. The solution pH, algal biomass productivity and CO2 utilization as inorganic carbon conversion (Ci) were determined at different salt loading concentration and type of culture media
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