Preparation and application of quaternary ammonium tannin magnet modified flocculant for collecting microalgae

A salinized tannin magnetic and salinized tannin technology, which is applied in the field of preparation of quaternary ammonium salinized tannin magnetically modified flocculants, can solve the problem that the magnetic medium cannot be reused, the synthesis of the magnetic separation medium is complicated, and it cannot be re-cultivated, etc. problems, to achieve the effect of low requirements for separation equipment, lower operation and collection costs, and easy control

Active Publication Date: 2015-09-30
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cai Dongqing, Liu Dan et al. used acid-modified fly ash and ultra-pure magnetite powder compound flocculation to treat cyanobacteria in water blooms, which can effectively flocculate algal cells and water particle pollutants, but the reduction of hydrochloric acid concentration will make The modification effect is significantly reduced, and the collected microalgae cells have been acid-modified and cannot be cultured again
Liu and li et al. (Liu D. , Li F. T. , Zhang B. R. Water Sci. Technol. 2009, 59, 1085) used chitosan-modified magnetic polymer as the magnetic separation medium to successfully separate cyanobacteria in freshwater algal blooms, but their The synthesis of magnetic separation media is relatively complicated, and the magnetic media cannot be reused due to the influence of ionic strength. In addition, chitosan is expensive, which greatly increases the cost, and large-scale application is very difficult.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1: 100mg / L quaternized tannins and 10mg / mL Fe 3 o 4 Magnetic particle collection of Scenedesmus obliquus ( Scenedesmus obliqnus )

[0053] Adding Fe to the quaternized tannin aqueous solution 3 o 4 Magnetic particles to quaternize tannin powder: Fe 3 o 4 Magnetic particles: water = 1mg: 100mg: 0.4mL, the two are evenly mixed for 1min and then added to a cell density of 1.79×10 10 In the Scenedesmus oblique algae liquid of individual / L, make the final concentration of quaternary ammonium salted tannin be 100mg / L, Fe 3 o 4 The final concentration of magnetic particles was 10 mg / mL. Stir rapidly at 100rpm for 1min and then place it on a 2000G magnetic field to settle. After 1min, calculate the algae cell density in the supernatant and obtain a separation rate of 95.1%.

Embodiment 2

[0054] Example 2: 20mg / L quaternized tannins and 5mg / mL Fe 3 o 4 Magnetic particles collect Chlorella vulgaris ( Chlorella vulgaris)

[0055] Adding Fe to the quaternized tannin aqueous solution 3 o 4 Magnetic particles to quaternize tannin powder: Fe 3 o 4 Magnetic particles: water = 1mg: 250mg: 1mL, the two are evenly mixed for 1min and then added to a cell density of 3.09×10 9 In the Chlorella vulgaris algae liquid of individual / L, make the final concentration of quaternary ammonium salted tannin be 20mg / L, Fe 3 o 4 The final concentration of magnetic particles was 5 mg / mL. Stir rapidly at 100rpm for 1min and then place it on a 3000G magnetic field to settle. After 1min, calculate the algae cell density in the supernatant and obtain a separation rate of 93.6%.

Embodiment 3

[0056] Example 3: 300mg / L quaternized tannins and 10mg / mL Fe 3 o 4 Magnetic particle collection of Staphylococcus branici ( Botryococcus braunii )

[0057] Adding Fe to the quaternized tannin aqueous solution 3 o 4 Magnetic particles to quaternize tannin powder: Fe 3 o 4 Magnetic particles: water = 1mg: 33mg: 0.6mL, the two are evenly mixed for 1min and then added to a cell density of 3.19×10 10 In the staphylococcus brown algae liquid of individual / L, make the final concentration of quaternary ammonium salted tannin be 300mg / L, Fe 3 o 4 The final concentration of magnetic particles was 10 mg / mL. , stirred rapidly at 100rpm for 1min and then placed in a 3000G magnetic field to settle. After 1min, the algae cell density in the supernatant was calculated and the separation rate was 98.2%.

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Abstract

The invention relates to the field of chemical engineering separation and in particular relates to a self-assembled quaternary ammonium tannin magnet modified flocculant for collecting microalgae as well as a preparation and application of the flocculant. The flocculant is prepared by mixing quaternary ammonium tannin powder, magnetic particles and water in the ratio of from 0.1mg: 5mg: 1ml to 10mg: 200mg: 1ml. The adopted Fe3O4 magnetic particles are at a nano scale and are assembled with the active groups on the quaternary ammonium tannin at the surface; the assembled magnetic medium has a flocculation performance 10-20 times better than that of a traditional flocculant and an applicable PH range (4.0-13.9) wider than that of the traditional flocculant, but the production cost of the flocculant is 1/5 that of the traditional flocculant.

Description

technical field [0001] The invention relates to the field of chemical engineering separation, in particular to a preparation method and application of a quaternary ammonium salted tannin magnetically modified flocculant for collecting microalgae. . Background technique [0002] In order to reduce the severe environmental pollution caused by the use of fossil fuels, biodiesel, a green energy alternative to petrochemical diesel, has received more and more attention. As a single-celled photosynthetic microorganism, microalgae has high photosynthetic efficiency, high oil yield, small cultivation area and fast growth rate, so it is an ideal biodiesel producer. However, due to the small size of microalgae cells and low concentration in aqueous solution, the cost of separation and dehydration is relatively high, which restricts the development of energy-based microalgae. [0003] The commonly used methods for harvesting microalgae include air flotation, filtration, sedimentation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D21/01C12N1/12
Inventor 梁文艳赵远刘丽君樊乾龙
Owner BEIJING FORESTRY UNIVERSITY
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