Microalgae large-scale culture device suitable for improving carbon fixation efficiency

Abstract

The invention provides a microalgae large-scale culture device suitable for improving carbon fixation efficiency. The microalgae large-scale culture device comprises a raceway pond provided with at least one raceway and a stirring paddle mounted in the raceway pond, wherein the stirring paddle is mounted at one end of the raceway, and algae liquid in the raceway flows through the rotation of the stirring paddle; the microalgae large-scale culture device is characterized by further comprising a plurality of transparent cover plates; the transparent cover plates are discontinuously distributed above the raceway; the bottoms of the transparent cover plates are in contact with the upper surface of the algae liquid. Gas-liquid-cover contact is realized, the gas-liquid contact time is prolonged, and the CO2 dissolving efficiency is improved. An aeration unit in the raceway pond can generate small air bubbles, and the generated air bubbles are not aggregated, so that the CO2 dissolving efficiency is improved; meanwhile, the aeration unit also has the characteristics of smoothness and uneasiness of being blocked, crushing resistance and uneasiness of being crushed; the aeration unit is low in manufacturing cost and easy to mount and maintain, and multi-point discontinuous arrangement can be realized in the raceway pond for large-scale culture.

Description

technical field [0001] The invention relates to an algae cultivation device, in particular to a microalgae scale cultivation device suitable for improving carbon fixation efficiency. Background technique [0002] Microalgae can use photosynthesis to absorb the greenhouse gas carbon dioxide. Because of its simple structure, its photosynthetic efficiency is higher than that of ordinary higher plants, and there is no differentiation of biological organs, so it grows rapidly. Because the reported oil content of microalgae cells can reach 70 More than %, it is a very promising biomass raw material for the production of renewable energy. However, the current high production cost limits the large-scale cultivation of microalgae. There are many factors affecting the production cost. Among them, the development of microalgae photobioreactor and the large-scale cultivation method of microalgae have always been one of the difficulties in microalgae production. . Therefore, the develo...

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Problems solved by technology

In a closed microalgae cultivation system, improving the utilization efficiency of CO2 is mainly to increase the utilization rate of CO2 by prolonging the contact time between the gas and the culture liquid. Shallow (usually 30-50cm), increasing the depth will increase the consumption of water and stirring power on the one hand, on the other hand, the absorption of light by the microalgae culture solution makes increasing the depth of the culture solution not conducive to the accumulation of biomass per unit area, so , the contact time between the fed CO2 gas and the culture water is generally 1-3s, which leads to a very low CO2 dissolution rate and hinders the improvement of the efficiency of microalgae to fix CO2

For the greenhouse-type film-type fully enclosed runway pool, it provides a relatively closed space to alleviate the influence of the external environment to a certain extent, but it only uses bamboo or steel bars to make an arc-shaped structure above the open runway pool and then covers it with plastic. The film is sealed, which is the same structure as the vegetable greenhouse. Due to the low water level, the CO2 introduced directly overflows, and the utilization rate is not improved. At the same time, foggy water vapor is formed on the inner surface of the film, and the light transmittance is reduced, resulting in a decrease in the biomass of microalgae; and Although the gas-liquid-cover contact type fully enclosed runway pool can improve the dissolution efficiency of CO2, it has the disadvantages of high dissolved oxygen concentration, high investment cost, and difficulty in achieving large-scale cultivation. Difficult to release, resulting in photoinhibition or photooxidation reactions, resulting in the death of microalgae and the reduction of biomass

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