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A preparation method of modified algae flocculant and its application in controlling cyanobacteria bloom

A flocculant and modification technology, applied in the field of new modified polymer algae flocculants, can solve problems such as difficult to achieve ideal effects, achieve good flocculation effect, good adsorption effect, and improve the effect of saturated adsorption capacity

Active Publication Date: 2017-03-22
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to achieve the desired effect if the dose is small

Method used

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  • A preparation method of modified algae flocculant and its application in controlling cyanobacteria bloom
  • A preparation method of modified algae flocculant and its application in controlling cyanobacteria bloom
  • A preparation method of modified algae flocculant and its application in controlling cyanobacteria bloom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A preparation method of modified algae flocculant, the steps are as follows:

[0047] A. Weigh 4g ferric nitrate and dissolve it in 1L double distilled water, stir and dissolve, transfer the dissolved liquid into a beaker, and stir continuously at 50 rpm after adding the magnet;

[0048] B. Put the granular anionic polyacrylamide in an oven and bake at 65°C for 40 minutes to remove moisture, then accurately weigh 4g of granular anionic polyacrylamide and add it to the ferric nitrate solution that is constantly stirring, and mix the whole The system was reacted for 4 hours under stirring at room temperature (20-25°C);

[0049] C. After the reaction in step B is completed, centrifuge the modified polyacrylamide after reaction at a speed of 3000 rpm for 5 minutes to remove the upper layer of water, and then wash the centrifuged modified polyacrylamide with pure water 1-2 times to remove the surface Unstably adsorbed metal ions remained, and the washed polyacrylamide was d...

Embodiment 2

[0050] Determination of dosage

[0051] Set up three treatment groups and one control group

[0052] Three modified polyacrylamide treatment groups, the final concentration of modified polyacrylamide were 10mg / L, 50mg / L and 100mg / L respectively, the control group did not receive any treatment, and each treatment group did 3 parallels.

[0053] 50ml of Microcystis aeruginosa 905 algae solution at an algae concentration of 1*10 7 When cell / ml, within 30 minutes, three concentrations of flocculants, the effect is as follows Figure 4 , the flocculation efficiency of the two concentrations of modified polyacrylamide within 30 minutes is almost the same, according to the formula: removal rate = (m-n) / m*100 (m: OD of algae solution without adding modified polyacrylamide 680 The value of; n=algae solution OD after adding modified polyacrylamide for 30min 680 value), its removal rate has reached more than 98%, so it is better to choose a flocculant with a concentration of 10mg / L. ...

Embodiment 3

[0058] A kind of application of algal flocculant in controlling cyanobacteria bloom, its application process is as follows:

[0059] Put different amounts of modified polyacrylamide flocculants into different Microcystis solutions to test their algae removal effect, the results are as follows:

[0060] 1) figure 1 and figure 2 It shows that the final concentration of modified polyacrylamide is 100mg / L, and the concentration of algae is 2*10 6 cell / ml (OD 680 =0.58) Microcystis aeruginosa 905 has the effect of removing algae within 30min, figure 1 , 2 Shown is the removal effect of Microcystis aeruginosa 905. According to the formula: removal rate = (m-n) / m*100 (m: OD of algae solution without adding modified polyacrylamide 680 The value of; n=algae solution OD after adding modified polyacrylamide for 30min 680 The value) removal rate reaches 99.45%.

[0061] 2) image 3 It shows that the modified polyacrylamide with a final concentration of 10 mg / L and the ordinary...

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Abstract

The invention discloses a preparation method of a modified alga flocculating agent, and an application of the alga flocculating agent in treatment of cyanobacterial bloom. Iron nitrate is fixed to negative polyacrylamide through chemical complexation and physical adsorption technologies. The surface of the modified flocculating agent has many ion properties, so the improved flocculating agent can rapidly remove microcystis. The modified flocculating agent has a good adsorption effect, like high-molecular polymers are commercial products and are cheap and easily available, and the modified flocculating agent has very high stability. The modified flocculating agent also has the advantages of non-toxicity and harmlessness to environment, human and animals, no residual, substantial improvement and purification of culture water environment, effective avoiding of the bursting of the cyanobacterial bloom, and no secondary pollution.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a novel modified polymer algae flocculant for removing Microcystis, the novel modified polymer algae flocculant will not cause secondary pollution to the environment, and is cheap and easy to obtain , High flocculation efficiency, can quickly remove Microcystis in cyanobacteria blooms in eutrophic water bodies. Background technique [0002] Cyanobacterial blooms are the result of continuous eutrophication of water bodies in recent years, and the outbreak of harmful algae in natural lakes, rivers and aquaculture water has become a global concern. Algal blooms have become a global problem that seriously affects the quality of the water environment and the ecological security of water bodies. It not only greatly endangers human health and other biological safety, but also causes huge losses to the global economy. Therefore, how to quickly control and eliminate algae bloom po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56
Inventor 张学振陈元元
Owner HUAZHONG AGRI UNIV
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