A harvesting device that uses microbubble recoil to concentrate microalgae cells in the raceway pool

Abstract

The invention discloses a harvesting device capable of concentrating microalgae cells in raceway pond by virtue of microbubble backflash. The harvesting device comprises an aeration net, side surface blocking nets, a front surface blocking net and a collecting pipe, wherein the front end of the aeration net faces to the water flow direction and is arranged at the bottom of the raceway pond, and the rear end of the aeration net is connected with the lower part of the front surface blocking net; two sides of the aeration net are connected with the side surface blocking nets, and the side surface blocking nets and the aeration net form alga liquid inlets; the collecting pipe is arranged at the upper end of the front surface blocking net and is detachably connected with a collecting hole of the raceway pond. Compared with an existing preliminary concentration manner of alga cells, the harvesting device has the advantages that (1) the preliminary concentration of the alga cells is effectively realized in real time, less time is consumed in the whole link, and the problems of bacterium breeding, biomass loss and the like are avoided; (2) the energy consumption is avoided, the structure is simple, and the assembly and disassembly are convenient; (3) the cost is low, the manufacturing is easy, the efficiency is high, and the production cost of large-scale culture of microalgae is beneficially lowered.

Description

technical field [0001] The invention relates to a harvesting device for concentrating microalgae cells in a raceway pool by recoil of microbubbles, and belongs to the field of microalgae cultivation engineering. Background technique [0002] As the most important primary producer in nature, microalgae has begun to play an important role in the fields of food, medicine, cosmetics, and fine chemicals. Recently, with the depletion of fossil energy such as petroleum and coal, clean bioenergy based on biomass has attracted great attention due to its renewable nature. Microalgae, with fast growth, short cultivation period and high oil content, can be cultivated in environments not suitable for food cultivation, such as saline-alkali land and tidal flats; therefore, they are called the most promising bioenergy candidate species. [0003] In the large-scale cultivation of microalgae, the open cultivation based on the track pool has a long history, low cost, and the highest adoption...

AI Technical Summary

Problems solved by technology

However, this culture method also has some disadvantages: low utilization rate of light energy, low utilization rate of carbon dioxide, greater influence by external environment, etc.

This method has the following disadvantages: 1. The sedimentation efficiency is low; 2. During the sedimentation process, since most of the cells are in a dark environment, the total biomass will suffer a considerable loss as the sedimentation time prolongs; 3. Bacteria are easy to breed; 4. The energy consumption of transferring algae liquid is very large; 5. For some algae species, the centrifugal speed setting is low and cannot be concentrated efficiently, and if the setting is too high, it will cause cell rupture.

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