Open photobioreactor for microalgae cultivation

Abstract

The invention provides an open photobioreactor for microalgae cultivation. The reflector is composed of a plurality of reactor frame units, and the whole reflector is step-shaped. The upstream end ofeach hydraulic drop stilling unit is upwards and convexly provided with an overflow weir. An accommodating groove is formed between the overflow weirs of the adjacent hydraulic drop stilling units. Aculture plate is arranged in each accommodating groove. A culture layer for culturing microalgae is arranged on the surface of each culture plate. The bottom surface of the reactor is obliquely arranged towards the downstream direction. The open photobioreactor has the advantages that (1) during algae liquid culture, the light receiving area is sufficient, the photosynthetic utilization rate is high, and the growth rate is high; (2) the surface of the culture plate is provided with a circularly flowing culture solution, so that the normal growth temperature of an algae solution can be effectively maintained; (3) the thickness of the liquid on each culture plate is 10 to 15mm, so that microalgae can be directly subjected to gas exchange with the outside, and a ventilation and aeration device is not needed; (4) the harvesting mode is simple, and continuous or semi-continuous culture can be realized; and (5) the whole device is simple in structure, low in energy consumption and easy to expand production.

Description

technical field [0001] The invention relates to the technical field of industrial devices used for microalgae cultivation, in particular to a photobioreactor for large-scale cultivation of microalgae. Background technique [0002] There are two main types of traditional photobioreactors for microalgae cultivation: closed reactors and open reactors. Closed reactors mainly include tubular reactors, vertical plate reactors, bag reactors, and stirred tanks. Closed reactors are not easy to pollute during the breeding process, and the concentration of algae in the water is high. The algae breeding process is easy to control, but the closed reactor also has the following disadvantages: 1. Because the algae liquid is affected by light and absorbs a lot of heat, the internal temperature of the reactor rises, so the breeding process requires a lot of heat exchange equipment and consumes a lot of energy; 2. . Closed reactors usually need to be equipped with artificial lighting systems...

AI Technical Summary

Problems solved by technology

Closed reactors mainly include tubular reactors, vertical plate reactors, bag reactors, and stirred tanks. Closed reactors are not easy to pollute in the breeding process, and the concentration of algae in the water is high. The algae breeding process is easy to control, but the closed reactor also has the following disadvantages: 1. Because the algae liquid is affected by light and absorbs a lot of heat, the internal temperature of the reactor rises, so the breeding process requires a lot of heat exchange equipment and consumes a lot of energy; 2. . Closed reactors usually need to be equipped with artificial lighting systems, which also increases energy consumption; 3. The inner wall of closed reactors is easily polluted by microalgae, which is not easy to clean, and it is difficult to achieve continuous microalgae cultivation; 4. The structure is complex, It is relatively difficult to enlarge; 5. The equipment is expensive, and the maintenance and operation costs are high

The traditional open reactor is mainly the raceway pool reactor, which is characterized in that the reactor is placed horizontally, and the culture medium is mainly circulated by the rotation of the paddle wheel or the rotating arm. It is cheap and easy to maintain and maintain, but the concentration of algae is high Low carbon dioxide utilization rate, low production efficiency, easy to be polluted by zooplankton, other microalgae and other foreign species during the breeding process, etc.

The invention patent with the authorized notification number CN101550393B discloses a reactor named for outdoor cultivation of microalgae, which is cultivated by means of algae liquid flowing through the stepped reactor, and there is a large drop from the upstream end to the downstream end of the reactor , therefore, when transporting the algae liquid that has not reached the harvest concentration to the fresh algae liquid output pipe, it is necessary to configure a high-power mechanical pump; in the cultivation process, it is also necessary to provide a carbon dioxide delivery device and a special microalgae harvesting system; therefore, Breeding microalgae in this way has the disadvantages of troublesome harvesting process, complicated equipment and high energy consumption.

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