Photobioreactor for raceway pond

Abstract

The invention provides a photobioreactor for a raceway pond. The photobioreactor comprises the raceway pond (1), a variable-speed stirring system, a carbon dioxide supply system (4) and a ground temperature control system. Compared with the prior art, the photobioreactor has the advantages that firstly, a variable hydraulic stirring system is introduced into the reactor, so as to be suitable for cultivation of microalgae with different mechanical resistance types; secondly, compared with the traditional motor, one hydraulic stirring system can drive multiple raceway ponds to realize large-scale application, so that the investment cost and the operating energy consumption can be greatly reduced; thirdly, the reactor is additionally provided with the carbon dioxide supply system and a gas refining device is arranged at the tail end of the carbon dioxide supply system, therefore, the detention time of carbon dioxide in water is prolonged and the utilization rate of the carbon dioxide by microalgae is improved; fourthly, a plastic film is arranged at the top of the raceway pond, so that the external pollution probability is reduced; and fifthly, the novel cyclic temperature control system is adopted, so that the cultivation time of the microalgae in winter and summer is prolonged and the energy consumption of the reactor is reduced.

Description

technical field [0001] The invention relates to the field of microalgae cultivation engineering, in particular to a raceway pond photobioreactor. Background technique [0002] Microalgae are the main producers of natural water bodies, and play an important role in global energy conversion and carbon cycle. The CO fixed by microalgae photosynthesis every year 2 About the world's CO 2 More than 40% of the fixed amount. At the same time, microalgae cells are rich in high value-added bioactive substances such as proteins, pigments, and various unsaturated fatty acids, and have gradually become an important source of materials in the fields of health food, medicine, and fine chemicals. With the depletion of traditional fossil energy (petroleum, coal, etc.), microalgae has received great attention as a renewable energy source (oil, etc.), and the microalgae industry, which has important social and environmental effects, has shown broad application prospects. [0003] At present...

AI Technical Summary

Problems solved by technology

Most of the motor stirring systems are constant-speed stirring, and the speed-regulating motor can achieve the purpose of adjusting the output speed, but on the one hand, the cost is too high, and on the other hand, it cannot meet the low speed requirements of algae cultivation (5-50 rpm)

The main defects of the motor constant speed stirring system in microalgae cultivation are: (1) It cannot solve the contradiction between different growth stages of microalgae, growth conditions and corresponding stirring frequency

The disadvantage of this device is that it increases the complexity and investment cost of the raceway pool structure, and also increases the later operation and maintenance costs, which is not conducive to cleaning and sterilization

At the same time, the traditional runway pool photobioreactor still has shortcomings such as how to effectively control the temperature at low cost, and the low utilization rate of CO2

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