Microalgae concentrating and collecting method and device thereof

Abstract

A microalgae concentrating and collecting method can realize the separation of micoralgae and water through filtering water in microalgae liquid and exhausting and collecting water through a siphon. A microalgae concentrating and collecting device of the invention comprises a microalgae culture pool for culturing and collecting microalgae, a micro-strainer and a siphon, wherein the micro-strainer is arranged in the microalgae pool, and is provided with a micro-filter film which allows water to pass through for filtering water in the microalgae and collecting microalgae, one end of the siphon is a tee pipe, one port of the tee pipe is connected with the water outlet of the micro-strainer for self-suction of water to stop water cutoff, other port thereof is connected with a water collecting pool for discharging water in the microalgae culture pool into the water collecting pool through the siphon in the mode of self-flow, and the third port thereof is connected with an air / liquid back-flush inlet, and electromagnetic valves are respectively installed on the siphon which is connected with the water collecting pool and the air / liquid backflush inlet. The electromagnetic valves are used for controlling the back-flush, and realize the continuous operations of microalgae concentration and collection. The invention can realize the microalgae collection with ultra-low energy consumption.

Description

technical field [0001] The invention belongs to the main fields of energy, aquatic products, health products, water treatment, environmental governance, protection and restoration, and specifically relates to a method for concentrating and collecting microalgae that can be used in the above fields. [0002] The invention also relates to a device for the above method. Background technique [0003] The large-scale cultivation of energy microalgae can not only fix solar energy, provide a large amount of biomass raw materials required by renewable energy, but also absorb a large amount of greenhouse gas carbon dioxide, realize energy saving and emission reduction, and develop a circular economy. As one of the most important links in the energy microalgae industry chain - the concentration and collection of microalgae biomass has always been one of the difficulties in microalgae production, and it is also one of the reasons for the high production cost. Therefore, the developmen...

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Problems solved by technology

[0004] The commonly used method of collecting microalgae is flocculation method, which needs to add a certain amount of flocculant, the cost of flocculant is high, it is difficult to reuse the breeding water, and the residual flocculant will also have a serious impact on the quality of microalgae products; the sedimentation method is to use the sedimentation effect The cost of collecting is low, but at the same time, the efficiency is low. Generally, it takes a day or even longer. The quality of the microalgae is not good and the sedimentation time is too long, which will cause the algae to rot; the effect of collecting microalgae by centrifugation is obvious, but the energy consumption Huge, the cost is too high; microalgae are collected by filtration, because the volume of microalgae is too small, ordinary filter cloth and filter paper cannot be collected, while conventional microfiltration and ultrafiltration are usually filtered by pressurization or vacuum, due to the deposition of microalgae The direction is the same as the direction of water flow, so the microalgae that cause deposition can easily clog the filter pores and make the filtration process difficult to continue

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