Method and device for collecting microalgae utilizing phototropism

Abstract

The invention provides a method for collecting microalgae utilizing phototropism of the microalgae, comprising the steps of cultivating the microalgae in a microalgae cultivating device under the condition suitable for the growth of the microalgae until the microalgae to be collected grows to a needed collectable phase, shielding all transparent surfaces of the microalgae cultivating device or collecting device with a light shield layer, disposing one or more light holes on the light shield layer of any transparent surface, placing one or more light sources at the light hole(s), removing clear solution when the microalgae in the culture fluid basically gathers around the light source after a proper time, and obtaining microalgae with high concentration. The invention also provides the phototactic microalgae collecting device which is formed by simple alteration.

Description

technical field [0001] The invention provides a method for harvesting algae bodies by utilizing the phototaxis of microalgae. The invention also provides a phototaxis microalgae harvesting device which is simply modified. Background technique [0002] Algae are the lowest, self-supporting oxygen-evolving plants, and they are a group of various and extremely widely distributed lower plants. Whether it is oceans, freshwater lakes and other waters, or wet soil, tree trunks, etc., it can survive almost anywhere with light and humidity. Microalgae refer to some microscopic unicellular, group or filamentous algae, most of which are planktonic algae with large biomass and wide distribution. Algae can obtain biomass fuel through pyrolysis, which is an important renewable bioenergy source; through agrochemical technology, oil can be extracted from some fat-rich microalgae for the preparation of edible oil and biodiesel; algae also contains a variety of Vitamins, carotene, protein,...

AI Technical Summary

Problems solved by technology

[0009] Although the above-mentioned existing technical solutions can collect algae, there are some disadvantages in these existing technologies. For example, the use of centrifugation to process microalgae culture fluid requires expensive centrifuges, and the price is usually hundreds of thousands to millions. , high equipment investment cost and high energy consumption; the membrane filtration method has the disadvantages of serious membrane pollution, difficult cleaning, and high cost; although the flocculation method is relatively simple to operate, flocculants such as aluminum potassium sulfate and additives such as polyacrylamide need to be washed and removed , time-consuming, and high cost; the air flotation method needs to increase gas supply equipment and gas, which is costly and not environmentally friendly

In addition, the collection of algae by these collection methods is discontinuous and separated from the cell culture process, resulting in a lack of continuity and unity in the production process, which greatly reduces the comprehensive utilization efficiency of production equipment

Images