Collection method of oil-containing microalgae

A harvesting method and microalgae technology, applied in the petroleum industry, unicellular algae, liquid carbonaceous fuels, etc., can solve the problems of large dosage, high cost, difficult industrial application, etc., and achieve the effect of good sedimentation performance

Inactive Publication Date: 2011-05-11
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because it is used alone, the dosage is large, the cost is high, and it is difficult to apply industrially
There are also attempts to use polyacrylamide, chitin, and alginate as flocculants, but their effect on marine microalgae precipitation is poor, so it is difficult to expand their applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Combine chitosan and FeCl with a degree of N-deacetylation of 70% 3 Dissolve in hydrochloric acid solution with pH=6, make chitosan concentration 10g / L, FeCl 3 The concentration is 4g / L to prepare the flocculant mother liquor. Cultivate platyphytes to keep the temperature at 20°C, pH=6, and turbidity of 16NTU. Take 1ml of flocculant and add 1L of microalgae culture solution to make the chitosan concentration 10mg / L, FeCl 3 The concentration is 4mg / L. The microalgae culture solution is quickly stirred with a stirrer at 300 rpm for 2 minutes, and then slowly stirred at 20 rpm for 20 minutes. After that, the stirring is stopped and the microalgae culture solution is allowed to settle for 30 minutes. The sedimentation rate of the microalgae reaches 98%; the supernatant was discarded, the microalgae flocs were poured into a centrifuge, and the microalgae flocs were further dehydrated at a speed of 4800 rpm, and the total dehydration rate of the obtained microalgae ...

Embodiment 2

[0013] Example 2: Combine chitosan and AlCl with a degree of N-deacetylation of 70% 3 Dissolve in hydrochloric acid solution with pH=6, make chitosan concentration 15g / L, AlCl 3 The concentration is 5g / L, and the flocculant mother liquor is prepared. Cultivate platyphytes to keep the temperature at 25°C, pH=6.5, and turbidity of 17NTU. Add 1ml of flocculant to 1L of microalgae culture solution to make the chitosan concentration 15mg / L, AlCl 3 The concentration is 5mg / L. The microalgae culture solution is quickly stirred with a stirrer at 350 rpm for 2 minutes, and then slowly stirred at 30 rpm for 20 minutes. After that, the stirring is stopped and the microalgae culture solution is allowed to settle for 30 minutes. The sedimentation rate of the microalgae reaches 98.5%, discard the supernatant, pour the microalgae flocs into a centrifuge, and further dehydrate at 4000 rpm. The total dehydration rate of the obtained algae mud reaches 98%. Directly put the algae mud into the re...

Embodiment 3

[0014] Example 3: Combine chitosan with a degree of N-deacetylation of 70% and KAl(SO 4 ) 2 ·12H 2 O is dissolved in the hydrochloric acid solution with pH=6, so that the concentration of chitosan is 20g / L, KAl(SO4) 2 ·12H 2 The O concentration is 6g / L, and the flocculant mother liquor is prepared. Cultivate platyphytes to keep the temperature at 23°C, pH=6, and turbidity of 18NTU. Take 1ml of flocculant and add 1L of microalgae culture solution to make the chitosan concentration 20mg / L, KAl(SO 4 ) 2 ·12H 2 O concentration is 6mg / L, stir the microalgae culture solution with a stirrer at 400 rpm for 3 minutes, then slowly stir at 30 rpm for 30 minutes, then stop the stirring, and let the microalgae culture solution stand for 35 minutes to settle the sedimentation rate. To reach 98%, discard the supernatant, pour the microalgae flocs into a centrifuge, and further dehydrate at 4000 rpm. The total dehydration rate of the obtained algal mud reaches 98%. The algae mud is directly p...

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Abstract

The invention discloses a collection method of oil-containing microalgae and is characterized in that the method comprises the following steps: a chitosan-Lewis acid flocculant is added into a culture liquid of oil-containing microalgae until the concentration of Lewis acid in the microalgae culture liquid ranges from 3 mg/L to 9 mg/L and the concentration of chitosan in the microalgae culture liquid ranges from 2 mg/L to 30 mg/L; the microalgae culture liquid is rapidly stirred at a rotation speed ranging from 200 rpm to 500 rpm for 1 mintues to 5 mintues and then slowly stirred at a rotation speed ranging from 20 rpm to 70 rpm for 20 mintues to 40 mintues, and sequentially the microalgae culture liquid stands to allow precipitation for 15 mintues to 60 mintues; and the microalgae flocculation body is centrifugally dehydragted under the condition that the rotation speed ranges from 3000 rpm to 5000 rpm. The invention adopts the chitosan-Lewis acid compound flocculant which is easily prepared, can form a compact flocculation body and can increase the overall dehydration rate of the microalgae mud up to over 98%, so as to completely meet the produciton requirements of the biological fuels, achieve the flocculant and catalyst integrated technique, save the cost and have remarkable economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of energy microalgae, and in particular relates to a method for collecting energy microalgae by combining chemical agent flocculation and centrifugation. Background technique [0002] Microalgae ( Microalgae ), also known as unicellular algae, has the characteristics of high photosynthetic efficiency, strong environmental adaptability, short growth cycle, and high biological output. Microalgae has high nutritional value. For example, the protein content of spirulina is 60-70%, which is rich in vitamins and amino acids, which can improve the immunity of the human body; it can also be extracted from microalgae to prevent and treat cancer, heart disease, arterial Bioactive substances for diseases such as sclerosis and diabetes; microalgae grow fast and can absorb a large amount of CO 2 , which is beneficial to reduce the greenhouse effect; the growth of microalgae can absorb a large amount of nutrient salts, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/12C10L1/02
Inventor 李春虎孟范平冯丽娟卞俊杰高健田义斌
Owner OCEAN UNIV OF CHINA
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