고농도 미세조류 배양을 위한 고효율 평판형 광생물 반응기의 설계 및 제어에 관한 연구

Abstract

The shortage of fossil fuel has been promoting the development of alternative biofuels such as biodiesel. Biodiesel is an environment friendly fuel produced from renewable bioresources such as microalgae. Microalgae are known to store large amount of lipid up to 50% of dry mass. Especially, production of biodiesel based on microalgae biomass is one of the cost-effective approaches, because microalgae can be cultivated with water and carbon dioxide. In this research, Microalgae cultivation control system was developed to accomplish the continuos culture and the flat panel PBR of 200L was designed by ANSYS. Growth curve was obtained by Gompertz model, Logistic model, and Baranyi model whitch are microbial growth prediction models for continuous culture. Gompertz model was suitable to predict the growth curve of Dunaliella salina because it has the highest R-squared value. The process was controlled by measurement of the real-time turbidity of cell density. Sensor noise was decreased by the Savitzky-Golay signal smoothing. The motion duty cycle of pump was obtained up to 53% by the appropriate on-off control technique. The Goal Driven Optimization(GDO) was introduced to examine the influences of the design variables for scale-up of PBR. Total deformation was 1.4mm of polycarbonate and total stress was 33MPa of rib. The number of bolts between the PBR panel and frame were estimated by ANSYS. Deformation of rib was compared respectively in the simulation and the experiment. In addition, Oxygen transfer coefficient was measured. The was measured to obtain oxygen transfer velocity of the PBR using the dynamic method. Oxygen meltage and volumetric oxygen transfer rate were measured by .