Photobioreactor with improved supply of light by surface enlargement, wavelength shifter bars or light transport

• US 6,509,188 B1
• Filed: 10/31/2001
• Issued: 01/21/2003
• Est. Priority Date: 04/13/1999
• Status: Expired due to Term

• Current Assignee: Subitec Gmbh
• Original Assignee: Fraunhofer-Gesellschaft
• Inventors: Trösch, Walter, Zastrow, Armin, Retze, Alexander, Schmid-Staiger, Ulrike, Brucker, Franz
• Primary Examiner(s): Redding, David A.
• Application Number:
  US09/926,278
• Time in Patent Office: 447 Days
• Field of Search: 435/420, 435/292.1, 435/295.1, 435/295.2, 47/59.R, 47/581.LS, 47D/IG.6
• 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 27/20 Baffles; Ribs; Ribbons; Auger vanes
• CPC Class Codes: C12M 31/02 located outside the reactor
• CPC Class Codes: Y10S 47/06 Plant growth regulation by control of light thereon

Abstract

A photobioreactor is described that has a reactor chamber that is made of light-transparent material and that has an increased surface area.

Claims

1. A photobioreactor comprising a reactor chamber having sidewalls made of light-transparent material defining an interior volume, wherein the reactor chamber has an increase in surface area greater than the planar enveloping surface of the interior volume of the reactor chamber.

2. A photobioreactor according to claim 1, wherein the reactor chamber further comprises devices for producing a turbulent flow conduction.

3. A photobioreactor according to claim 1, further comprising elements that conduct light into the reactor chamber from the outside.

4. A photobioreactor according to claim 1, wherein one or more sidewalls of the reactor have a meander-shaped or sinusoidal cross-section.

6. A photobioreactor according to claim 1, wherein the reactor chamber comprises a glass tube comprising glass extensions projecting into the interior of the reactor chamber.

7. A photobioreactor according to claim 1, wherein the reactor chamber is an airlift loop reactor or a plate-fin column.

8. A photobioreactor according to claim 7, wherein the reactor chamber has a rectangular cross-section, internal surfaces extending parallel to the reactor chamber sidewalls, air injectors at a lower side of the reactor chamber, and a medium supply tank and a biomass reservoir in fluid communication with the interior of the reactor.

9. A photobioreactor according to claim 7, comprising a plurality of airlift loop reactors connected in series, wherein the interior of each reactor is in fluid communication with an adjacent reactor.

10. A photobioreactor according to claim 7, comprising a plurality of airlift loop reactors arranged vertically to form a plate-fin column.

11. A photobioreactor according to claim 1, further comprising a wavelength shifting compound.

5. A photobioreactor comprising a reactor chamber having sidewalls made of light-transparent material defining an interior volume, wherein the reactor chamber further comprises light-transparent webs projecting into the interior of the reactor chamber.

12. A photobioreactor comprising at least one reactor chamber having sidewalls made of light-transparent material, wherein the reactor chamber comprises a first internal surface having first and second opposed edges, wherein the first and second opposed edges of the first internal surface are each spaced from an interior surface of the reactor chamber.

13. The photobioreactor of claim 12, further comprising:

at least one injector;

a medium supply tank; and

a biomass reservoir;

wherein the at least one injector, the medium supply tank and the biomass reservoir are in fluid communication with the interior of the reactor chamber.

14. The photobioreactor of claim 12, wherein the photobioreactor comprises a plurality of reactor chambers, and wherein the interior of each reactor chamber is in fluid communication with the interior of at least one other reactor chamber.

15. The photobioreactor of claim 14, wherein the reactor chambers are arranged vertically to form a column having a bottom reactor chamber, wherein an upper surface of the bottom reactor chamber forms a lower surface of an adjacent reactor chamber.

16. The photobioreactor of claim 14, wherein the reactor chambers are connected together with pipes or tubes.

17. The photobioreactor of claim 12, wherein the photobioreactor further comprises a wavelength shifting compound incorporated into a surface of the reactor or coated onto a reactor sidewall.

18. The photobioreactor of claim 17, wherein the wavelength shifting compound is selected from the group consisting of 4,5-dimethoxy-N-(2-ethyl-hexyl)naphthalamide;

3,9-Di(i-butoxycarbonyl)-4,10-dicyanoperylene;

N,N′

-bis(2,6-diisopropylphenyl)perylene-3,4;

9,10-tetracarboxylic diimide; and

N,N′

-bis(2,6-diisopropylphenyl)-1,6,7,12-tetraphenoxyperylene-3,4;

9,10-tetracarboxylic diimide.

19. The photobioreactor of claim 12, wherein the reactor chamber further comprises a second internal surface spaced from the first internal surface, the second internal surface having first and second opposed edges, wherein the first and second opposed edges of the second internal surface are each spaced from an interior surface of the reactor chamber.

20. The photobioreactor of claim 12, wherein the reactor chamber has a rectangular cross-section.

21. A method of cultivating phototropic microorganisms in a reactor as set forth in claim 12, the method comprising:

supplying the reactor with medium comprising phototropic microorganisms;

injecting a gas into the reactor such that medium in the reactor flows upwardly in a first internal region, impinges on an interior surface of the reactor and flows over the first opposed edge of the first internal surface, wherein at least a portion of the medium flowing over the first opposed edge flows downwardly in a second internal region, impinges on an interior surface of the reactor, and flows over the second opposed edge of the first internal surface to be recirculated into the first internal region;

impinging light from a light source onto the reactor; and

removing biomass produced in the reactor chamber.

22. The method of claim 21, wherein the light impinges on a wavelength shifting substance.

23. The method of claim 22, wherein the wavelength shifting substance comprises a fluorescent compound selected from the group consisting of 4,5-dimethoxy-N-(2-ethyl-hexyl)naphthalamide;

3,9-Di(i-butoxycarbonyl)-4,10-dicyanoperylene;

N,N′

-bis(2,6-diisopropylphenyl)perylene-3,4;

9,10-tetracarboxylic diimide; and

N,N′

-bis(2,6-diisopropylphenyl)-1,6,7,12-tetraphenoxyperylene-3,4;

9,10-tetracarboxylic diimide.

24. The method of claim 21, wherein the medium flows turbulently through the reactor.

25. A method of cultivating phototropic microorganisms in a reactor as set forth in claim 19, the method comprising:

supplying the reactor with medium comprising phototropic microorganisms;

injecting a gas into the reactor such that medium in the reactor flows upwardly in a first internal region between the first and second internal surfaces, impinges on an interior surface of the reactor and flows over the first and second internal surfaces, wherein medium flowing over the first opposed edge of the first and second internal surfaces flows downwardly in second and third internal regions, respectively, impinges on an interior surface of the reactor and flows over the second opposed edge of the first and second inner surfaces, respectively, to be recirculated into the first internal region;

impinging light from a light source onto the reactor; and

removing biomass produced in the reactor chamber.

26. The method of claim 25, wherein the light impinges on a wavelength shifting substance.

27. The method of claim 26, wherein the wavelength shifting substance comprises a fluorescent compound selected from the group consisting of 4,5-dimethoxy-N-(2-ethyl-hexyl)naphthalamide;

3,9-Di(i-butoxycarbonyl)-4,10-dicyanoperylene;

N,N′

-bis(2,6-diisopropylphenyl)perylene-3,4;

9,10-tetracarboxylic diimide; and

N,N′

-bis(2,6-diisopropylphenyl)-1,6,7,12-tetraphenoxyperylene-3,4;

9,10-tetracarboxylic diimide.

28. The method of claim 25, wherein the medium flows turbulently through the reactor.

29. A photobioreactor comprising a tubular reactor chamber made of light-transparent material, the reactor chamber comprising a plurality of projections extending from the reactor wall into the interior of the reactor chamber.

30. The method of claim 29, wherein the projections are elongate projections having a major dimension oriented perpendicularly to the reactor surface.

31. The method of claim 29, wherein the projections are elongate projections having a major dimension oriented at an angle to the reactor surface.

32. The method of claim 29, wherein the projections are made of light-transparent material.

33. A method of cultivating phototropic microorganisms in a reactor as set forth in claim 29, the method comprising:

flowing medium comprising phototropic microorganisms through the reactor chamber; and

impinging light from a light source onto the reactor.

34. The method of claim 33, wherein the light impinges on a wavelength shifting substance.

35. The method of claim 34, wherein the wavelength shifting substance comprises a fluorescent compound selected from the group consisting of 4,5-dimethoxy-N-(2-ethyl-hexyl)naphthalamide;

3,9-Di(i-butoxycarbonyl)-4,10-dicyanoperylene;

N,N′

-bis(2,6-diisopropylphenyl)perylene-3,4;

9,10-tetracarboxylic diimide; and

N,N′

-bis(2,6-diisopropylphenyl)-1,6,7,12-tetraphenoxyperylene-3,4;

9,10-tetracarboxylic diimide.

36. The method of claim 33, wherein the medium flows turbulently through the reactor.