An electrocoagulation-air flotation combined microalgae continuous harvesting device and method thereof

Abstract

The invention discloses an electric flocculation and air floatation combined continuous microalgae harvesting device and method. The device comprises an electric flocculation and air floatation zone, a harvesting zone, a water outlet zone and an air flocculation zone which are connected sequentially. A mixture of an algae solution and bittern water flows through a raceway pond to be sufficiently mixed and enters a deep groove in the tail end of the raceway pond; to-be-harvested algae is pumped from an algae solution inlet, lifted to a electrolysis plate and flocculated by hydroxide colloid, released by an electrode, of iron; flocculated and agglomerated microalgae cell clusters are adsorbed to float upwards by microbubbles released by a dissolved gas release port, are prompted to be further agglomerated, flow into the harvesting zone, are scraped into an algae storage tank by an algae scraping machine and are sent to a dehydration drying procedure; clear water at the bottom of the harvesting zone enters the water outlet zone through a gap below a baffle II. The harvesting efficiency of microalgae is greatly improved; the device needs few investments, occupies a small area, is simple to operate, has the advantages of low energy consumption, high efficiency and environmental protection and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of biotechnology, and relates to a continuous microalgae harvesting device and a method thereof. Background technique [0002] The high cost of harvesting microalgae has always been one of the bottlenecks restricting its large-scale production. At present, the main methods for harvesting microalgae include membrane filtration, centrifugation and flocculation. Membrane filtration not only has very low production efficiency, but also the membrane is easily fouled and clogged, and the cost of membrane regeneration or renewal is also high. Therefore it is not suitable for industrialized production application. Centrifugation is a more commonly used method. Although it does not need to add other chemical reagents, the operation is complicated, the energy consumption is large, and the cost is high. The Chinese invention patent "a microalgae collection device for a tubular centrifuge (CN201220618371.2)" discloses a microal...

AI Technical Summary

Problems solved by technology

Although this method has simple process, short reaction time and good flocculation effect; however, too much flocculation dose is required, which will not only increase the cost, but also cause certain pollution to the microalgae harvest and water body, and each flocculation requires a long time. Standing time, not continuous production

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