This research aims to development of Spirulina smart farms for bioethanol industrial which have a significant impact on emissions the greenhouse gas (GHG). Thus actions are recovered to enhance carbon source for Spirulina cultivation. Moreover, innovation of CO2 capture and control technology compiled with smart farm system is considered one of the most effective and environmental-friendly approaches to fixed CO2. The smart farm can be described into six systems, e.g., the temperature and relative humidity control system, the monitored pH and feeding CO2 control system, the solar-cell electric paddle wheel system, the enhanced photosynthetic using LED system, microalgae harvesting system and CO2 capture and control technology system.
The study to cultivate Spirulina platensis under simulated feed CO2 conditions, both of direct and through carbonator were evaluated. Effects of direct feed at 100% CO2 not more than 0.125 VVD, while maximum production found that at low molar fraction 10% CO2 and 0.25 VVD. The optimal conditions for feed CO2 through carbonator and 8 g/L sodium hydroxide (NaOH) were loading of bicarbonate stock solution not more than 1% of volume media per day.
To maintain desired large scale cultivation in the 18,000 Liters Spirulina smart farms. The optimum production rate of CO2 direct feed and feed CO2 through carbonator by loading of stock solution were found that to be 5.27 kgW/m3 and 6.84 kgW/m3, respectively. The production efficiency was higher than 56.4 % และ 66.4 % of conventional treated. The average productivity of Spirulina found maximum to be 0.52 gW/L.day. Analysis here reported allows the carbon fixed rate, CO2 utilization efficiency and carbon-reduction rate were found that to be 1.06 g/L.day 57.00 % and 463.5 x103 kg CO2 per year, respectively. Thus, the carbon-reduction rate of CO2 from ethanol industry may be useful to helping to alleviate global warming.