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Method for harvesting microalgae

A technology of microalgae and harvesting trays, applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve problems such as difficult operation, low sedimentation rate, unfavorable separation of clear liquid, etc., and achieve simple and efficient methods High, high sedimentation rate effect

Active Publication Date: 2016-04-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method still has the following disadvantages: a slight disturbance will redisperse the microalgae, which is not conducive to the separation of the settled supernatant, and the sedimentation rate is low
However, because the microalgae usually stick to the collection plate, the above method will bring operational difficulties when collecting, and it is more cumbersome

Method used

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  • Method for harvesting microalgae
  • Method for harvesting microalgae

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This example is used to illustrate the method for harvesting microalgae of the present invention.

[0056] The chlorella algae liquid (cultivated with BG11 medium, OD 680 2.1) transport to the sedimentation harvester a, and fill the sedimentation harvester a, adjust the pH=8, the temperature is 25 ° C, and settle in the dark for 24 hours. After the sedimentation, the separated water (that is, the clear liquid after the sedimentation , the same below) OD 680 0.2, the sedimentation rate reaches 90%. Then open the water outlet e, slowly release the separated water, the settled algae mud stays on the settling recovery tray b and the bottom of the settling recovery device a, and the rotating shaft d passes the scraper to settle the algae mud on the settling recovery tray b Scrape off the bottom of the sedimentation collector a, and collect the algae mud at the bottom of the sedimentation collector a.

Embodiment 2

[0058] This example is used to illustrate the method for harvesting microalgae of the present invention.

[0059] The chlorella algae liquid (cultivated with BG11 medium, OD 680 7.8) transport to the sedimentation collector a, and fill the sedimentation collector a, adjust the pH = 9, the temperature is 30 ° C, and settle in the dark for 24 hours. After the sedimentation, the separated water OD 680 is 0.45, and the sedimentation rate reaches 94%. Then the settling recovery tray b is taken out from the settling recovery tray a, and the rotating shaft d scrapes off the algal mud settled on the settling recovery tray b through a scraper and leaves the settling recovery tray b through the structure b1, and collects it, and then opens The water outlet e slowly releases the separated water, and collects the algae mud at the bottom of the settlement collector a.

Embodiment 3

[0061] This example is used to illustrate the method for harvesting microalgae of the present invention.

[0062] The chlorella algae liquid (cultivated with BG11 medium, OD 680 3.6) Transport to the sedimentation harvester a, and fill the sedimentation harvester a, adjust the pH=8.5, the temperature is 35°C, and settle in the dark for 24 hours. After the sedimentation, the separated water OD 680 is 0.33, and the sedimentation rate reaches 91%. Then open the water outlet e, slowly release the separated water, the settled algae mud stays on the settling recovery tray b and the bottom of the settling recovery device a, and the rotating shaft d passes the scraper to settle the algae mud on the settling recovery tray b Scrape off the bottom of the sedimentation collector a, and collect the algae mud at the bottom of the sedimentation collector a.

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Abstract

The invention discloses a method for harvesting microalgae. The method includes (1), arranging to-be-harvested microalgae liquid in a settling harvester (a) with at least one layer of settling harvesting disc (b); (2), allowing the microalgae to settle under the gravitational self-settling effects under gravitational self-settling conditions and separating the microalgae from water; (3), scraping microalgae mud by the aid of scraping structures (c) and separating the microalgae mud from the settling harvesting discs (b) via through structures (b1); (4), collecting the microalgae mud obtained by means of settling. The settling harvesting discs (b) are provided with the through structures (b1), and the scraping structures (c) which are matched with the through structures (b1) are arranged in the settling harvester (a). The microalgae mud which is about to be scraped at the step (3) settles on the settling harvesting discs (b). The method has the advantages that the method is high in settling rate; the viscous microalgae mud can be conveniently and efficiently harvested by the aid of the method; the microalgae mud can be collected and can be directly utilized without follow-up water removal operation; the method is simple and feasible and is high in efficiency.

Description

technical field [0001] The invention relates to a method for harvesting microalgae. Background technique [0002] Microalgae are a class of low-level plants that grow in water with a wide variety and are extremely widely distributed. It is a cell factory driven by sunlight, and absorbs CO through efficient photosynthesis of microalgae cells. 2 , convert light energy into chemical energy of carbohydrates such as fat or starch, and release O 2 . The use of microalgae to produce bioenergy and chemicals can simultaneously achieve "replacing fossil energy and reducing CO 2 The three purposes of "emission, purification of waste gas and sewage". The advantages of "microalgae biotechnology" lie in the following aspects: ① Microalgae is the original plant with the highest photosynthetic efficiency. Compared with crops, the yield per unit area is dozens of times higher Microalgae is also the fastest-growing plant in nature, usually within 24 hours, the biomass contained in microalg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/12C12R1/89
Inventor 荣峻峰黄绪耕程琳纪洪波
Owner CHINA PETROLEUM & CHEM CORP
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