Flocculating agent for microalgae capture and preparation method and application of flocculating agent

A flocculant and microalgae technology, applied in the field of microalgae capture, can solve the problems of poor flocculation performance, increase in flocculant dosage, consumption of large flocculant, etc., and achieve the effect of strong charge neutralization ability

Active Publication Date: 2020-01-03
NEIJIANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some data show that extracellular organic matter, especially dissolved organic matter, will consume a large amount of flocculant, resulting in increased flocculant dosage and poor flocculation performance.

Method used

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  • Flocculating agent for microalgae capture and preparation method and application of flocculating agent
  • Flocculating agent for microalgae capture and preparation method and application of flocculating agent
  • Flocculating agent for microalgae capture and preparation method and application of flocculating agent

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A flocculant for capturing microalgae, comprising a cationic starch substrate and tannic acid grafted on the substrate, the grafting degree of the tannic acid on the substrate is about 20%. The preparation steps of this flocculant are as follows:

[0028] S1: Spray 30g of 2% sodium hydroxide solution evenly into 100g of starch and stir evenly, then add 20g of 2,3-epoxypropyltrimethylammonium chloride, mix well and react at 65°C 6h; then wash the product with 80% ethanol solution, then dry and grind to obtain cationic starch; the degree of substitution of the obtained cationic starch is about 0.2;

[0029] S2: Dissolve 1g of cationic starch in 25g of distilled water to obtain a cationic starch suspension; add 0.05g of vitamin C and 1g of hydrogen peroxide (1mol / L) to the cationic starch suspension, stir and react at room temperature for 30min, and then add 10g of water ethanol, and dropwise added 25 g of 5% tannic acid aqueous solution, and reacted at room temperature f...

Embodiment 2

[0032] A flocculant for capturing microalgae, comprising a cationic starch base and gallic acid tannin grafted on the base, the grafting degree of the gallic acid tannin on the base is about 4%. The preparation steps of this flocculant are as follows:

[0033] S1: Spray 30g of 2% sodium hydroxide solution evenly into 100g of starch and stir evenly, then add 20g of 2,3-epoxypropyltrimethylammonium chloride, mix well and react at 70°C 5h; then wash the product with 80% ethanol solution, then dry and grind to obtain cationic starch; the degree of substitution of the obtained cationic starch is about 0.2;

[0034] S2: Dissolve 1 g of cationic starch in 30 g of distilled water to obtain a cationic starch suspension; add 0.08 g of vitamin C and 1 g of hydrogen peroxide (1 mol / L) to the cationic starch suspension, stir and react at room temperature for 35 minutes, and then add 10 g of water ethanol, and dropwise adding 25 g of a gallic acid tannin aqueous solution with a mass concen...

Embodiment 3

[0037] A flocculant for capturing microalgae, comprising a cationic starch substrate and tannic acid grafted on the substrate, the grafting degree of the tannic acid on the substrate is about 12%. The preparation steps of this flocculant are as follows:

[0038] S1: Spray 30g of 2% sodium hydroxide solution evenly into 100g of starch and stir evenly, then add 20g of 2,3-epoxypropyltrimethylammonium chloride, mix well and react at 65°C 8h; then wash the product with 80% ethanol solution, then dry and grind to obtain cationic starch; the degree of substitution of the obtained cationic starch is about 0.2;

[0039] S2: Dissolve 1g of cationic starch in 25g of distilled water to obtain a cationic starch suspension; add 0.1g of vitamin C and 1g of hydrogen peroxide (1mol / L) to the cationic starch suspension, stir and react at room temperature for 40min, and then add 10g of water ethanol, and dropwise added 25 g of a 2% tannic acid aqueous solution, and reacted at room temperature ...

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Abstract

The invention discloses a flocculating agent for microalgae capture and a preparation method and application of the flocculating agent. The flocculating agent comprises a cationic starch substrate andhydrolyzed tannin grafted on the substrate, wherein the grafting degree of the hydrolyzed tannin on the substrate is 4-20%. The preparation method comprises the following steps: cationizing starch, and grafting tannin on the cationized starch. In actual microalgae capture, when the use amount of the flocculating agent is 0.5-0.7 mg/L, a microalgae harvesting rate can reach 90% or above; and compared with starch and cationic starch, the flocculating agent has the advantages that the harvesting rate is greatly increased, the use amount of the flocculating agent can be reduced by 40 times or above, and remarkable economic benefits are produced.

Description

technical field [0001] The invention belongs to the technical field of microalgae capture, and in particular relates to a flocculant for microalgae capture and a preparation method thereof. Background technique [0002] With the increasing pressure on resources and the environment, microalgae, as a new type of renewable green material, has attracted much attention. However, the harvesting of microalgae is one of the key issues restricting the development of the microalgae industry. According to relevant statistics, the cost of harvesting microalgae accounts for more than 30% of the production cost of microalgae. [0003] Current methods for harvesting microalgae mainly include centrifugation, gravity settling, filtration, air flotation, adsorption, pH induction, and flocculation. Among them, flocculation has the advantages of low cost, convenient operation, and less dependence on equipment, so it is widely used to harvest microalgae. During the flocculation process, indivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C08B31/12C12N1/12C12R1/89C02F101/30
CPCC02F1/56C02F2101/30C08B31/125C12N1/12
Inventor 由耀辉汪恒马静吴远彬孙绪兵张理元廖立敏
Owner NEIJIANG NORMAL UNIV
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