Horizontal immersion cover type carbon supplement device and carbon supplement method used for microalgae culture in open pond

Patent metadata

Field	Value
Publication number	US-10160945-B2
Application number	US-201214396597-A
Country	US
Kind code	B2
Filing date	May 7, 2012
Priority date	May 7, 2012
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

The invention relates to the field of mass cultivation of microalgae and specifically relates to a horizontal submerged cover type carbon supplement device and carbon supplement method for cultivating microalgae in an open pond. The horizontal submerged cover type carbon supplement device for cultivating microalgae in an open pond, comprises: one or more than two covers and gas distributors, wherein the gas distributor is arranged at the bottom of the open pond and the cover is arranged above the gas distributor; the cover, in form of a cylinder with openings at both ends, is arranged along the flow direction of the culture solution, the two ends of the cover being a culture solution inlet and a culture solution outlet respectively; the gas distributor is kept away from the culture solution outlet of the cover by more than 40 cm. According to the invention, when microalgae cells are cultivated in the open pond, carbon dioxide can be effectively utilized for carbon supplement, so production cost is greatly reduced.

First claim

The invention claimed is:

1. A horizontal submerged cover type carbon supplement device for cultivating microalgae in an open pond, comprises: at least one cover and at least one gas distributor, wherein the at least one gas distributor is arranged at a bottom of the open pond and the at least one cover is arranged above the at least one gas distributor; the at least one cover, in a form of a cylinder with an opening at a first end and a second end thereof, is arranged along a flow direction of a culture solution, the first end of the at least one cover being a culture solution inlet and the second end of the at least one cover being a culture solution outlet and the top of the at least one cover being inundated by the culture solution; the at least one gas distributor being entirely positioned at least 40 cm from the culture solution outlet of the at least one cover.

2. The carbon supplement device according to claim 1 , wherein a distance between the at least one gas distributor and the culture solution outlet of the at least one cover is between 60-750 cm.

3. The carbon supplement device according to claim 1 , wherein the at least one cover is directly mounted at the bottom of the open pond or overhead arranged at the bottom of the open pond.

4. The carbon supplement device according to claim 1 , wherein a bottom of the at least one cover is a closed structure.

5. The carbon supplement device according to claim 1 , wherein a body of the at least one cover is one of a semi-circular cylinder, an arc-shaped cylinder, a rectangular cylinder and a trapezoidal cylinder.

6. The carbon supplement device according to claim 1 , wherein the first and second ends of the at least one cover are formed with a bell mouth.

7. The carbon supplement device according to claim 1 , wherein a height of the at least one cover is 2-20 cm.

8. The carbon supplement device according to claim 1 , wherein a width of the at least one cover is at least 2 cm.

9. The carbon supplement device according to claim 1 , wherein the carbon supplement device comprises at least two covers forming a conjoined structure.

10. A carbon supplement method for cultivating microalgae in an open pond based on the carbon supplement device of claim 1 , comprises: the horizontal submerged cover type carbon supplement device is arranged at the bottom of the open pond along the direction of the channel of the open pond to enable the culture solution to inundate the top of the cover; the culture solution flows into the culture solution inlet of the cover under the driving of a stirrer of the open pond and flows out of the culture solution outlet of the cover after being in contact with CO 2 released from the gas distributor in the carbon supplement device;
the flow velocity of the culture solution in the open pond is 20-50 cm/s;
the flow rate of the CO 2 in the horizontal submerged type carbon supplement device, calculated as pure CO 2 under standard condition, is 0.1-20 L/min per meter of the width of the open pond.

11. The carbon supplement method according to claim 10 , wherein the depth of the culture solution in the open pond is 2-30 cm.

12. The carbon supplement method according to claim 10 , wherein the blade tip of the stirrer is lower than the bottom of the open pond.

13. The carbon supplement method according to claim 10 , wherein the horizontal submerged cover type carbon supplement device is arranged in a shallow groove at the bottom of the open pond.

14. The carbon supplement method according to claim 10 , wherein the bottom of the shallow groove is a flat bottom, a flat bottom with round corners or a semi-circular bottom.

15. The carbon supplement method according to claim 10 , wherein the CO 2 is one or more of cleaned flue gas, industrial CO 2 gas, pure CO 2 gas or air mixed with CO 2 , or liquid CO 2 .

16. The carbon supplement method according to claim 10 , wherein the medium for cultivating microalgae is Zarrouk medium, SM medium, ASP2 medium or BG-11 medium.

17. The carbon supplement method according to claim 10 , wherein the microalgae are spirulina, scenedesmus, haematococcus pluvialis,Dunaliella salina, chlorella , or chlamydomonas.

Assignees

• Cong Wei
• Liu Ming
• Wu Xia
• Wen Shumei
• Zhang Dongmei
• Sun Zhongliang
• Inst Process Eng Cas

Inventors

• Cong Wei
• Liu Ming
• Wu Xia
• Wen Shumei
• Zhang Dongmei
• Sun Zhongliang

Classifications

• C12M21/02

  Photobioreactors (culturing algae A01G33/00, A01H4/001, C12N1/12) · CPC title

• C12M23/18

  Open ponds; Greenhouse type or underground installations · CPC title

• C12M23/38

  Caps; Covers; Plugs; Pouring means · CPC title

• C12M29/06 Primary

  Nozzles; Sprayers; Spargers; Diffusers (per se B01F23/231, B01J19/26) · CPC title