Microalgae cell culture and collection integrated system and method

Abstract

The invention relates to a microalgae cell culture and collection integrated system and belongs to the technical field of microalgae culture and collection. The culture system comprises a photoreactor, an air inlet pipe, a stirrer, an exhausting port and a light source. One end of the air inlet pipe is inserted into a culture solution of the photoreactor, the stirrer is arranged in the photoreactor, the exhausting port is formed above the liquid level of the culture solution, and the light source is arranged inside and / or outside the photoreactor. The collection system is composed of a filterresidue bed and a collection bed, wherein the filter residue bed is arranged above the collection bed, and the photoreactor and the filter residue bed in the culture system are connected through a pipe. The microalgae cell culture and collection integrated system performs microalgae cell culture by adopting a photosynthesis culture process and then quickly collects microalgae cells through a collecting bed with an inclination angle changing from 0 degree to 90 degrees in a continuous or gradient way, thorough separation of the microalgae cells and a culture solution is ensured, the problem ofunsmooth microalgae cell discharging is also effectively avoided, and the microalgae cell collection efficiency is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of cultivating and harvesting microalgae, in particular to an integrated system and method for cultivating and harvesting microalgae cells. Background technique [0002] Microalgae is an autotrophic plant widely distributed in the natural environment. It can not only synthesize high value-added compounds such as oil, sugar, protein, and carotene through photosynthesis, but also because of its high photosynthetic efficiency, fast growth, and unit The yield per mu is high, and it is considered by the International Food and Agriculture Organization to be one of the most important food resources for human beings in the future. Due to the small size of algae cells, it is difficult to harvest and the cost of harvesting is high, which has become one of the difficult problems restricting the development and large-scale promotion of the microalgae industry. For this reason, people have developed the culture device o...

AI Technical Summary

Problems solved by technology

In this harvesting system, the algae liquid flows through the inclined filter bed like a waterfall, and the water penetrates the filter screen and the algae mud adheres to the screen surface, which needs to be washed by the water flow. The device with this structure not only occupies an area of ​​the harvesting system It is very large, and the construction cost is also high, and it needs uninterrupted water flow to prevent the accumulation of algae mud, which not only affects the harvest, but also makes unmanned management very difficult

In addition, the algae mud harvested by this flat screen or inclined screen platform needs to flow into a recovery pond first, and it needs to use additional power such as piston pumps to transfer to algae mud dehydrator or other drying equipment or containers for further processing, and the process is long. , the recovery efficiency is low

[0004] In order to solve the practical problems of low recovery efficiency and large footprint of flat or inclined sieve devices, Chinese patent application CN 102696340 A proposes a device for collecting and dehydrating algae liquid in which inclined drum filters are connected in series. The core is to use the driving device of the drum to drive the multi-stage drum to rotate and separate the algae liquid and algae mud, so that the pumped algae liquid rotates and moves in the drum filter

Compared with the existing unpowered flat sieve, it is necessary to use a high-power drive device to drive the heavy harvesting membrane platform to rotate. Because the harvesting membrane device is large and clumsy, the energy consumption of harvesting power is greatly increased, which is different from the currently commonly used unpowered screen. Compared with the multi-stage flat sieve, the technical advantage is not obvious, but the accumulation of algae mud on the surface of the drum filter membrane will cause the problem of poor harvesting

[0005] In summary, the existing methods and systems for culturing and harvesting microalgae cells still have a series of problems such as complex cultivation process, high cost, large area of ​​harvesting equipment, and low harvesting efficiency. Therefore, it is necessary to study a New microalgae cell culture and harvesting system

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