Algae harvesting comprises concentrating a part of a liquid in which the algae are located, which include bringing the algae present in the liquid, for flotation, by means of micro-bubbles, and harvesting

Algae harvesting comprises concentrating a part of a liquid in which the algae are located, which include bringing the algae present in the liquid, for flotation, by means of micro-bubbles exhibiting a diameter of = 80 mu m, and harvesting. An independent claim is also included for an algae harvesting device, comprising a container (1) connected with a feed line, an injection point for gas, an injection device and a floating material extraction device, which is provided to remove algae from the container, where the feed line in an operable condition is connected to a liquid source and the injection device is provided to mix and enrich a liquid supplied from the liquid source under pressure, with a gas to form a gas-liquid mixture, where the feed line comprises a connection point over which the algae-containing liquid is supplied, where the injection device is designed such that the gas-liquid mixture after passing through a expansion device comprises micro-bubbles with a diameter of = 80 mu m. Die Erfindung geht aus von einem Algenernteverfahren, bei dem Algen, die sich in einer Flüssigkeit befinden, in einem Teil der Flüssigkeit konzentriert werden. Es wird vorgeschlagen, dass die Algen in der Flüssigkeit mittels Mikroblasen, die einen Durchmesser ≤ 80 μm besitzen, zum Flotieren gebracht werden und abgeerntet werden.