The invention discloses a microalgae culturing device, which comprises an open
runway pool, wherein the open
runway pool is provided with a liquid outlet; the liquid outlet is connected with a liquid
circulating pump, and is connected with a liquid inlet of a culturing
liquid storage tank through the liquid
circulating pump; the top of the culturing
liquid storage tank is provided with a liquid outlet pipeline, so that a
culture fluid can flow back into the open
runway pool through the pipeline; and the bottom of the culturing
liquid storage tank is provided with a gas
distributor for introducing various CO2-containing gases for replenishing carbon for a microalgae
culture fluid. By controlling the volume ratio and the circulating speeds of the
culture fluid in the open runway pool and the culture fluid in the culturing
liquid storage tank, the detention time of microalgae cells in the bright runway pool and the dark culturing
liquid storage tank is adjusted, and bright and dark
forced circulation of the microalgae cells is realized. By adopting the device and the method, the problems of poor bright and dark mixing of cells, low
light energy utilization ratio and difficulties in charging gas and replenishing carbon in the culturing process of the conventional open runway pool are solved, the culturing efficiency, the growing rate and the area yield of microalgae are increased remarkably, and the investment and running costs of a
mass microalgae culturing
system are reduced.