Method and device for collecting and concentrating microalgae

Abstract

The invention provides a method for collecting and concentrating microalgae. The method is characterized in that microalga-containing liquid is poured into a mesh barrel formed by a microporous stainless steel mesh, the water level raises to generate natural pressure through which the moisture can be discharged through micropores, and microalgae remain in the barrel, so that the purposes of collecting and concentrating microalgae are achieved. The device comprises (1) a microalga collecting barrel, (2) a microalga breeding tank container, (3) an alga liquid pump and (4) a liquid level control device, wherein the microalga collecting barrel is composed of three parts, wherein the upper part and the lower part are equipped with circular hollow barrels (or tapered barrels), and the middle part is equipped with a vertical circular microporous stainless steel mesh barrel (or tapered barrel) which is connected and fixed to the upper part and the lower part; the alga liquid pump is used for transferring alga liquid from the breeding container into the microalga collecting barrel; the liquid level control device can be used for controlling the alga liquid pump to be started and stopped according to the level of liquid in the collecting barrel, in order to enable proper height of alga liquid in the microalga collecting barrel. According to the device, the natural settlement direction of microalgae is vertical to the liquid flowing direction (or more than 90 degrees); meshes in the lower part are blocked by the microalgae, and meshes in the upper part are not blocked by the microalgae, so that the microalgae can be collected and concentrated.

Description

technical field [0001] The invention belongs to the main fields of energy, aquatic products, health care products, water treatment, environmental governance, protection and restoration, and specifically relates to a method for collecting and concentrating microalgae that can be used in the above fields. [0002] The invention also relates to a device for implementing the above method. Background technique [0003] Biodiesel is a kind of bioenergy with good development prospects. Microalgae will be an important source of biodiesel. Because microalgae has the advantages of fast growth, high oil content, and does not occupy arable land, it is considered to be the best alternative to fossil fuels. One of the potential raw materials for biodiesel. At present, the technical route of producing oil from microalgae has been fully established, but due to its high production cost, it is still relatively limited in large-scale industrial production and application. Optimizing the effi...

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Problems solved by technology

[0004] There are many methods for collecting and concentrating microalgae commonly used at present. Among them, the centrifugation method is to separate the microalgae from water by centrifugal force. This method can achieve a good collection effect, but it consumes a lot of energy and costs high; Adding chemical and biological flocculants to the algae liquid can speed up the aggregation and settlement of microalgae. However, in addition to the high cost of the flocculant, its residue will also affect the quality of microalgae products, and it will also affect the reuse of aquaculture water. ; Filtration method is to adopt microporous membrane filtration, but the cost of the membrane is high, it is easy to block, which affects large-scale collection, the collection process is slow, the membrane is easy to cause pollution, and it cannot be reused for a long time (replacement causes an increase in cost)

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