A Photobiological Fluidized Bed Reactor for Wastewater Treatment

Abstract

The invention discloses a photobiological fluidized bed reaction device for wastewater treatment, which belongs to the technical field of microalgae cultivation. It includes the device body, whose side walls are made of light-transmitting materials; the adsorption and sterilization unit, including ultraviolet lamps and adsorption and sterilization layers arranged at intervals in multiple layers. , the adsorption and sterilization layer from top to bottom is the adsorption carbon layer, light-absorbing black cloth and fine mesh grid; the culture structure is equipped with immobilized activated sludge balls in the middle of the culture structure, and immobilized algae in the outer part of the culture structure. The ball; the spray device is arranged between the cultivation structure and the adsorption sterilization unit, and is connected to the spray interface on the side wall of the device body; the waterproof light strip; and the spiral is arranged on the cultivation structure. The invention realizes the integration of algae cultivation and collection, saves the cost of microalgae cultivation, purifies water and air, and harvests a large amount of algae biomass.

Description

technical field [0001] The invention relates to the technical field of microalgae cultivation, in particular to a photobiological fluidized bed reaction device for wastewater treatment. 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, as...

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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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