Device and method for photosynthetic culture

• US 8,945,916 B2
• Filed: 06/15/2011
• Issued: 02/03/2015
• Est. Priority Date: 06/15/2010
• Status: Active Grant

• Current Assignee: David Shih-Wei Chou
• Original Assignee: David Shih-Wei Chou
• Inventors: Chou, David Shih-Wei
• Primary Examiner(s): HURST, JONATHAN M
• Application Number:
  US13/161,462
• Publication Number:
  US 20110306121A1
• Time in Patent Office: 1,329 Days
• Field of Search: 435/292.1
• US Class Current: 435/292.1
• CPC Class Codes: C12M 21/02 Photobioreactors culturing algae A01G33/00, A01H4/001, C12N1/12
• CPC Class Codes: C12M 23/04 Flat or tray type, drawers C12M23/10, C12M23/12, C12M23/16 take precedence
• CPC Class Codes: C12M 31/04 Mirrors
• CPC Class Codes: C12M 39/00 Means for cleaning the apparatus or avoiding unwanted deposits of microorganisms apparatus for cleaning laboratory receptacles or instruments B01L13/02; cleaning in general B08B
• CPC Class Codes: C12M 41/08 Means for changing the orientation
• CPC Class Codes: C12N 1/12 Unicellular algae; Culture media therefor as new plants A01H13/00
• CPC Class Codes: C12N 1/125 Unicellular algae isolates
• CPC Class Codes: C12R 2001/89 Algae ; Processes using algae
• CPC Class Codes: Y02A 40/80 in fisheries management

Abstract

A device and system for growing of a photosynthetic culture is provided which employs one or a plurality of vertically disposed photopanels having interior cavities configured for holding liquid and the photosynthetic culture such as algae. Interior surfaces are enhanced in size by projections defined by deformation in sidewalls of the photopanels. The projections communicate between the sidewalls also providing structural integrity to the photopanel and allowing for thinner sidewalls and increased light transmission therethrough. The system may employ a support rack and pivotal mount to each such photopanel to allow positioning adjacent to each other in rows. Pivoting during different lighting conditions afforded the racked photopanels provides a manner to reduce light blockage to individual photo panels from adjacent photopanels.

Claims

1. An apparatus configured to contain a light dependent chemical process comprising an enclosure having transparent walls defining an inner chamber to hold a liquid medium, whereby the shape of the inner chamber is structurally stabilized and defined in part or in full by bridging elements formed by integral inwardly projecting extensions of the enclosure walls defining hollow cavities, wherein the hollow cavities are open to the outside of the enclosure at a first sidewall of the enclosure and extend therefrom to planar surfaces of a second opposite sidewall of the enclosure, and said hollow cavities further having truncated ends formed by planar surfaces parallel to the planar surfaces of the second sidewall that directly engage planar surfaces of the second sidewall of the enclosure.

2. The apparatus according to claim 1, wherein the enclosure and the inner chamber form a photobioreactor.

3. The apparatus according to claim 1, wherein the enclosure comprises transparent PET.

4. The apparatus according to claim 2, wherein the bridging elements increase a surface area to volume ratio of the inner chamber.

5. The apparatus according to claim 2, wherein the bridging elements are configured to distribute light to an enlarged inner chamber surface area.

6. The apparatus according to claim 2, wherein the bridging elements form one or more light guides.

7. The apparatus according to claim 2, wherein the enclosure is formed of a plastic film or sheet material that is less than or equal to 0.25 inches thick.

8. The apparatus according to claim 2, wherein the bridging elements are thermoformed with recyclable PET plastic that is less than or equal to 0.125 inches thick.

9. The apparatus of claim 2, wherein at least some bridging elements comprise hollow cones with a base open to the outside of the enclosure.

10. The apparatus according to claim 2, wherein the enclosure has a sufficiently large vertical height and sufficiently small horizontal cross sectional area when vertically disposed and containing a dense cell culture therein to establish a nutrient gradient when a nutrient is applied in one end of the inner chamber.

11. The apparatus according to claim 10, wherein the diffusion of a nutrient is reduced by the presence of the bridging elements, which further decreases or limits the horizontal cross sectional area.

12. The apparatus according to claim 10, further comprising an apparatus for collecting cells, particles, or compositions of matter at one end of the inner chamber.

13. The apparatus according to claim 2, wherein the enclosure has an overall outer shape of a rectangular photopanel with a greater height than width or thickness, wherein the enclosure is formed from one or more vertically extending sections, and wherein the inner chamber contains algae, and wherein the walls of the enclosure are formed of transparent plastic less than or equal to 0.125 inches thick.

14. The apparatus according to claim 13, wherein the walls of the enclosure are thermoformed with transparent recyclable PET.

15. The apparatus according to claim 14, wherein a plurality of hollow cones are thermoformed to the opposing walls of the enclosure as bridging elements.

16. The apparatus according to claim 15, wherein the hollow conal bridging elements increase the surface area to volume ratio of the inner chamber.

17. The apparatus according to claim 15, wherein the hollow conal bridging elements distribute light over the enlarged surface area, and wherein the hollow conal bridging elements comprise smooth or stepped sides.

18. The apparatus according to claim 13, comprising side-lit LED panels applied to one or both sides of the photopanel.

19. The apparatus according to claim 13, wherein the enclosure has an overall rectangular prism outer shape having three dimensions such that a largest dimension of the apparatus is at least 4-fold greater than a second largest dimension, and the second largest dimension is at least 6-fold greater than a third dimension.

20. The apparatus of claim 1, wherein the hollow cavity is wider at the first sidewall than at the second sidewall and wherein the hollow cavity comprises one or more steps between the first sidewall and second sidewall.