Tower type fluidized bed photobioreactor

Abstract

The invention discloses a tower type fluidized bed photobioreactor and belongs to the technical field of microalgae culture. The tower type fluidized bed photobioreactor comprises a wastewater fermentation unit, a liquid collection unit, a culture treatment unit and an adsorption sterilization unit, wherein the wastewater fermentation unit is used for performing stirring fermentation on wastewatercollected in an accommodating cavity in the wastewater fermentation unit to obtain a microalgae culture solution; the liquid collection unit is connected with the wastewater fermentation unit and isused for collecting and storing the microalgae culture solution; the culture treatment unit has a tower type structure and is sequentially provided with a spraying device and a culture structure witha plurality of layers of holes from top to bottom; the middle part of the culture structure is provided with an immobilized activated sludge ball; the outer side part of the culture structure is provided with an immobilized algae ball; the culture structure is further provided with a waterproof lamp belt; the spraying device is connected with the liquid collection unit; and the adsorption sterilization unit is arranged on the top of the culture treatment unit to perform filtering and sterilization on air which enters the top of the culture treatment unit. The tower type fluidized bed photobioreactor provided by the invention realizes integration of algae culture, collection and wastewater fermentation, purifies the water quality and air while saving the microalgae culture cost and harvestsa great quantity of algae biomass at the same time.

Description

technical field [0001] The invention relates to the technical field of microalgae cultivation, in particular to a tower type fluidized bed photobioreactor. Background technique [0002] Microalgae are photoautotrophic organisms that are widely distributed in fresh water, oceans and various soils on the earth. They have the characteristics of rapid growth, high photosynthetic efficiency, strong adaptability and asexual reproduction. Microalgae can use light energy, CO2, organic carbon in wastewater, ammonia nitrogen, organic phosphorus and other substances as carbon sources, nitrogen sources and phosphorus sources, and absorb heavy metals to purify wastewater; they can also absorb CO2 and other gases in the atmosphere as their own metabolic carbon source, produce O2 to purify the air; at the same time, microalgae contain a variety of high value-added bioactive substances, such as polyunsaturated fatty acids, algae polysaccharides, phycocyanin, astaxanthin, carotene, etc., whi...

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Problems solved by technology

[0004] For the development of microalgae energy, the main research directions at home and abroad are the use of microalgae to treat wastewater, microalgae to obtain biological carbon fixation, large-scale cultivation of microalgae and the extraction of high value-added products. In terms of treatment, large-scale cultivation and extraction of high value-added products, there are the following problems. 1. Microalgae need light to convert CO2 and carbon sources into O2 for biological carbon sequestration; 2. Microalgae have limited degradation of COD in sewage. After a certain period of time, the COD of sewage will still increase, but the degradation effect on nutrients such as N, P, etc. is outstanding; 3. The microalgae are small and difficult to settle, which also leads to the collection of microalgae in a suspended state The cost will be greatly increased, which is also the main reason for restricting the large-scale cultivation of microalgae; 4. The residence time in the water required for microalgae to treat wastewater is long, and the microalgae cannot be removed well after the sewage is processed, resulting in the deterioration of the water body. Turbidity, color, etc. increase; 5. The biological carbon fixation of microalgae is low, because the CO2 in the air in the suspended state needs to diffuse freely from the air medium into the liquid medium and enter the algal cells before it can be absorbed and fixed in the air. Photosynthesis occurs under the action of light, and CO2 is converted into O2, but the solubility of CO2 in the liquid is low. To increase the solubility of CO2 in the medium, the medium must be alkaline, but because microalgae are suitable for growth The pH range is about 6-10, so the biological fixation of CO2 is still greatly restricted and affected

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