Process and system for industrially producing biosilicon

Abstract

The invention discloses a process and system for industrially producing biosilicon. The system for industrially producing biosilicon comprises a culture system, a harvesting-extraction system and a crushing system in sequence, wherein the culture system is used for culturing diatom cells; and the harvesting-extraction system is used for separating diatom cells from a culture solution in the culture system, and meanwhile, is used for performing hot digestion on the separated diatom cells. By adopting the device, diatom shells can be separated from organic matters in diatom cells, and diatom shells can be obtained after filtering, the diatom shells are cleaned and dried and fed into the crushing system, and thus biosilicon powder of different sizes can be obtained. By adopting the process and system, the growth speed of diatom cells can be increased, and meanwhile, by adopting a method of compounding a flocculant, the cell damage rate can be reduced while a high recycling rate of the diatom cells is ensured, so that recycling the culture solution is not affected, and the production cost of diatom can be remarkably lowered.

Description

technical field [0001] The invention relates to the technical field of silicon dioxide preparation, in particular to a process and system for industrial production of bio-silicon. Background technique [0002] Microalgae are a group of photoautotrophic microorganisms that can produce a variety of chemicals by fixing carbon dioxide. Some can produce aliphatic hydrocarbons, such as botrytis, which can produce hydrocarbons up to 15% to 75% of dry cell weight, some can accumulate glycogen, and some can accumulate glycerol, and the oil content of many microalgae can reach 60% of dry weight. %above. Because of its fast growth rate and the ability to use waste water and waste gas for cultivation, it has received more and more attention worldwide. [0003] Diatoms are an important phylum of all microalgae, and their main feature is that the algal cells are covered with porous siliceous (mainly silicon dioxide) shells. The micropores on diatom frustules are inorganic nanostructure...

AI Technical Summary

Problems solved by technology

Although the diatoms described by this method grow fast and are not limited by seasons, the applicable scale is small and the possibility of industrialized production is low

In addition, Chinese patent CN201010587734.6 discloses a method for diatom open cultivation by adding silicon, the core of which is to control the addition of a sufficient amount of silicon when adding nutrient salts. Saturation solubility, this method changes the osmotic pressure of the diatom cell growth environment, and at the same time changes the proportion relationship of each nutrient element in the culture medium, and cannot significantly increase the biomass concentration of diatom cells

[0005] In addition, due to the small size of algae cells, it is difficult to harvest and increase the production cost of microalgae, which has become one of the difficult problems restricting the development and large-scale promotion of the microalgae industry

Commonly used microalgae harvesting methods mainly include filtration, centrifugation or flocculation and sedimentation, etc. The diatom cell wall has a unique structure, and the traditional centrifugation and filtration methods have a large shear force, resulting in damage to the siliceous shell structure and low recovery rate; flocculation and sedimentation require Adding a large amount of flocculant will cause difficulties in the reuse of aquaculture wastewater, pollution and waste of water resources

Chinese patent CN201821537938.7 proposes a microalgae cell culture-harvesting integrated system, the harvesting system consists of a filter residue bed and a recovery bed, and the filter residue bed is set above the recovery bed, but this method is only suitable for algae cells Relatively large species, such as spirulina, are 200-500 μm long and 5-10 μm wide. In fact, most diatoms have cell diameters below 50 μm

[0006] In summary, the existing diatom cultivation and harvesting still have problems such as slow growth, high production cost, and low efficiency. Therefore, it is necessary to study a new bio-silicon industrial production system by means of cultivating diatoms

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