A double-layer structure immobilized sustainable environmental protection algae ball device for carbon capture in industrial flue gas.

Abstract

A double-layered immobilized sustainable algal ball device for carbon capture in industrial flue gas comprises a photobioreactor, several sustainable algal balls, and a gas guiding unit. This device immobilizes cultured microalgal cells to form sustainable algal balls with a three-dimensional porous structure and good mechanical stability. When applied to an industrial flue gas carbon capture system, it can improve carbon dioxide absorption efficiency and system operational stability. The sustainable algal balls provide a stable environment for microalgal attachment and growth within the photobioreactor, and increase the gas contact area and residence time in the bubble flow field, thereby improving gas-liquid mass transfer efficiency and carbon capture performance.

Claims

1. A double-layer structure immobilized sustainable environmentally friendly algae ball device for carbon capture in industrial flue gas, comprising: A photobioreactor containing a culture medium; Several sustainable and environmentally friendly algal spheres are disposed inside the photobioreactor. Each sustainable and environmentally friendly algal sphere is a double-layered gelled sphere, comprising a core, which is a three-dimensional porous structure formed by immobilizing cultured microalgal cells in a biocompatible substrate; a coating layer, which is applied to the surface of the core to enhance the sphere's mechanical strength and shear resistance; and a gas guiding unit, which is disposed in the photobioreactor to directly introduce industrial flue gas containing carbon dioxide, generate microbubbles, and control their residence time and distribution to improve gas-liquid contact area and mass transfer efficiency. The gas guiding unit further forms a bubble flow field through an aeration unit and the culture medium circulation, so that the sustainable and environmentally friendly algal spheres are in a suspended or circulating state within the photobioreactor, thereby increasing the gas residence time and contact area. This allows the microalgal cells in the sustainable and environmentally friendly algal spheres to absorb carbon dioxide and perform carbon fixation through photosynthesis, wherein the volume percentage concentration of carbon dioxide in the industrial flue gas is 10% to 60%.

2. The double-layer structure immobilized sustainable environmental protection algae ball device for carbon capture of industrial flue gas as described in claim 1, wherein, The biocompatible substrate contains alginate or a biodegradable natural polymer.

3. The double-layer structure immobilized sustainable environmental protection algae ball device for carbon capture of industrial flue gas as described in claim 1, wherein, The coating layer is a chitosan coating layer.

4. The double-layer structure immobilized sustainable environmental protection algae ball device for carbon capture of industrial flue gas as described in claim 1, wherein, This photobioreactor is a tubular photobioreactor.

5. The double-layer structure immobilized sustainable environmental protection algae ball device for carbon capture of industrial flue gas as described in claim 1, wherein, The microalgal cells were selected from Chlorella, cyanobacteria, or other microalgae with carbon fixation capabilities.

6. The double-layer structure immobilized sustainable environmental protection algae ball device for carbon capture of industrial flue gas as described in claim 1, wherein, The sources of industrial flue gas include boiler exhaust, power generation exhaust, incineration system exhaust, or industrial process exhaust.

7. The double-layer structure immobilized sustainable environmental protection algae ball device for carbon capture of industrial flue gas as described in claim 1, wherein, These sustainable and environmentally friendly algae balls can be recycled and reused in the photobioreactor for carbon capture operations.

8. The double-layer structure immobilized sustainable environmental protection algae ball device for carbon capture of industrial flue gas as described in claim 7, wherein, These sustainable and environmentally friendly algae balls maintain an average carbon dioxide removal rate of over 90% in the industrial flue gas after at least three cycles of use.

9. The double-layer structure immobilized sustainable environmental protection algae ball device for carbon capture of industrial flue gas as described in claim 1, wherein, Once cultivated, these sustainable and environmentally friendly algal balls or their microalgal cells can be converted into biomass energy resources or agricultural materials.

10. The double-layer structure immobilized sustainable environmental protection algae ball device for carbon capture of industrial flue gas as described in claim 1, wherein, The removal rate of carbon dioxide in the industrial flue gas is over 90%.

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