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Microbial flocculating agent and preparation method thereof

A microbial flocculant and uniform technology, applied in the field of water treatment, can solve the problems of high culture cost, difficulty in strain screening, and insufficient applicability, and achieve the goal of wide application fields, improved sweeping ability, increased cross-linking degree and complexity Effect

Active Publication Date: 2018-06-19
XINJIANG ENVIRONMENTAL ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most of the current research on MBFs is aimed at a single bacterial group, and there are disadvantages such as difficulty in strain screening and high cultivation costs.

Method used

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  • Microbial flocculating agent and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] A microbial flocculant, grafting acrylamide and N,N'-methylenebisacrylamide into the microbial flocculant, the mass ratio of microbial flocculant, acrylamide, N,N'-methylenebisacrylamide It is 1:0.5:0.5.

[0031] A preparation method of microbial flocculant, the method steps are as follows:

[0032] S1: Add the microbial flocculant to deionized water and stir, and stir to 80°C while heating, and stir for 20 minutes until the biological flocculant emulsion becomes transparent and uniform;

[0033] S2: Introduce nitrogen into the reaction vessel to remove oxygen, and under the condition of continuous nitrogen protection, add acrylamide and N,N'-methylenebisacrylamide in proportion, keep stirring for 20 minutes to a uniform state, and then add initiator and urea , keep stirring, and react for 0.5h;

[0034] S3: After the reaction, cool the product to room temperature, adjust the pH to 7, add absolute ethanol to wash 3 times under stirring conditions, rinse 3 times with d...

Embodiment 2

[0040] A microbial flocculant, grafting acrylamide and N,N'-methylenebisacrylamide into the microbial flocculant, the mass ratio of microbial flocculant, acrylamide, N,N'-methylenebisacrylamide It is 1:2:2.

[0041] A preparation method of microbial flocculant, the method steps are as follows:

[0042] S1: Add the microbial flocculant into deionized water and stir, and stir to 95°C while heating, and stir for 30 minutes until the biological flocculant emulsion becomes transparent and uniform;

[0043] S2: Introduce nitrogen into the reaction vessel to exclude oxygen, under the condition of continuous nitrogen protection, add acrylamide and N,N'-methylenebisacrylamide in proportion, keep stirring for 30min to a homogeneous state, then add initiator and urea , keep stirring, react for 2h;

[0044] S3: After the reaction, cool the product to room temperature, adjust the pH to 8, add absolute ethanol to wash twice, rinse twice with deionized water, and then extract the crude pro...

Embodiment 3

[0050] A microbial flocculant, grafting acrylamide and N,N'-methylenebisacrylamide into the microbial flocculant, the mass ratio of microbial flocculant, acrylamide, N,N'-methylenebisacrylamide It is 1:1:1.

[0051] A preparation method of microbial flocculant, the method steps are as follows:

[0052] S1: Add the microbial flocculant to deionized water and stir, and stir to 90°C while heating, and stir for 25 minutes until the biological flocculant emulsion becomes transparent and uniform;

[0053] S2: Introduce nitrogen into the reaction vessel to exclude oxygen, and under the condition of continuous nitrogen protection, add acrylamide and N,N'-methylenebisacrylamide in proportion, keep stirring for 25 minutes to a uniform state, and then add initiator and urea , keep stirring, react for 1h;

[0054] S3: After the reaction, cool the product to room temperature, adjust the pH to 7.5, add absolute ethanol to wash twice, rinse with deionized water three times under stirring c...

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Abstract

The invention relates to a microbial flocculating agent. The microbial flocculating agent is prepared from grafted acrylamide and N,N'-methylene-bisacrylamide, wherein the microbial flocculating agentis produced by fermenting pseudomonas sp. DLXN-1 with the preservation number of CCTCC (China Center For Type Culture Collection) M20133305 and paenibacillus sp DLXN-2 with the preservation number ofCCTCC M20133306. The microbial flocculating agent provided by the invention has the properties of no toxicity, environment protection and safety; compared with an unmodified microbial flocculating agent, the crosslinking degree and complexity degree of a structure of the microbial flocculating agent are increased through grafting the microbial flocculating agent and a synthesized organic high polymer flocculating agent monomer; the purging and trapping capability is improved and the adsorption capability on metal plasmas is greatly increased through cationization modification, so that the flocculating capability of the grafted polymerized cation compound type microbial flocculating agent is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a graft copolymerization cationic composite microbial flocculant. Background technique [0002] As an indispensable pre-unit operation technology in the water treatment process, the coagulation process determines the operating conditions of the subsequent process, the final effluent water quality and operating costs, so it has become one of the important research contents in the field of environmental engineering. The effect of coagulation treatment largely depends on the quality of coagulant. Flocculant can be divided into inorganic system, biological system and synthetic polymer system. Synthetic polymer flocculants such as polyferric sulfate and polyacrylamide are widely used due to their high flocculation activity and low cost, but their residues are not easily biodegradable, and polyacrylamide monomers have strong neurotoxicity and Tertiary effect, caus...

Claims

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Application Information

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IPC IPC(8): C02F3/34
CPCC02F3/34
Inventor 李春腾周爱珍王刚
Owner XINJIANG ENVIRONMENTAL ENG TECH
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