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Hydrophilic polyurethane carrier, preparation method thereof and application of carrier

A technology of hydrophilic polyurethane and polyurethane, which is applied in the direction of being fixed on/in the organic carrier, can solve the problems of long time for microorganisms to hang on the film, increase capital and labor costs, and easy detachment of microorganisms, and achieve good reactivity and Hydrophilic, beneficial for adsorption and immobilization, and improved hydrophilicity

Inactive Publication Date: 2019-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyurethane carrier has disadvantages such as poor hydrophilicity, and it is easy to float when added to the sludge tank, which leads to a long time for microorganisms to hang on the film, and the microorganisms are easy to fall off under the impact of external force, which increases the capital and labor costs of daily operation and maintenance. Defects limit its further application to a certain extent
[0005] Therefore, there is an urgent need to research and develop a hydrophilic polyurethane carrier and its preparation method to overcome the problems of slow microbial film formation and carrier floating in the application process of the prior art, so as to provide a hydrophilic polyurethane carrier with good industrial application prospects. Waterborne Polyurethane Carrier

Method used

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  • Hydrophilic polyurethane carrier, preparation method thereof and application of carrier
  • Hydrophilic polyurethane carrier, preparation method thereof and application of carrier

Examples

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preparation example Construction

[0068] figure 1 A schematic flow diagram of the preparation method of the hydrophilic polyurethane carrier provided for a specific embodiment of the present invention; as figure 1 The steps shown include: step A: adding an oxidizing agent to the first prepolymer monomer solution prepared by the first prepolymer monomer and buffer to obtain the first prepolymer monomer modification solution, and then the polyurethane carrier Soak in the first prepolymer monomer modification solution, wash and dry to obtain a polyurethane carrier with a film-like first prepolymer on the surface; step B: coat the surface with a film-like The polyurethane carrier of the first prepolymer is soaked in the initiator solution, and then dried to obtain a hydrophilic polyurethane carrier precursor; step C: immersing the hydrophilic polyurethane carrier precursor into the second prepolymer monomer solution In the process, the light is irradiated, and the second prepolymer monomer and the hydrophilic pol...

preparation example 1

[0074] Prepare a 10mmol / L Tris-HCl solution, adjust the pH to 8, add dopamine and ammonium persulfate, the concentration is 2mg / mL, immerse a polyurethane cube with a side length of 20mm in the dopamine solution, soak for 2h; after soaking, take out The carrier is cleaned and dried with deionized water to complete the hydrophilic modification process of the polyurethane carrier; a methanol solution of 0.2mol / L benzophenone is prepared, and the dried polyurethane cube is immersed in the methanol solution of benzophenone , after soaking for 1 hour, take it out and dry it for later use; put the dried polyurethane carrier into an ultraviolet light generating device, immerse it in 10% sodium styrene sulfonate monomer solution, take it out after 10 minutes of ultraviolet light irradiation, place it in distilled water and wash it clean, That is, a hydrophilic modified polyurethane carrier is obtained.

Embodiment 1

[0076] Put the above-mentioned modified carrier prepared in Preparation Example 1 into the aerobic reaction tank for biological denitrification experiment. The sludge concentration in the aerobic tank is 3.2g / L. Under the condition of sufficient aeration, it only takes 5 days to complete the surface of the carrier. And the internal hanging film, taking a chemical wastewater with a COD of 730mg / L and an ammonia nitrogen of 115mg / L as the influent, the removal rate of COD can reach more than 94%, the removal rate of ammonia nitrogen can reach more than 99%, and the effluent COD is lower than 60mg / L, ammonia nitrogen lower than 2mg / L. Comparing the polyurethane carrier modified by sodium styrene sulfonate with the unmodified polyurethane carrier in Comparative Example 1, it was found that the fixed biomass can be increased by 55%.

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Abstract

The invention relates to a hydrophilic polyurethane carrier which comprises a polyurethane carrier body, a first membranous prepolymer and a second prepolymer, wherein the first prepolymer wraps the surface of the polyurethane carrier, and the second prepolymer is grafted with the first prepolymer. The second prepolymer comprises double bonds and a hydrophilic group, the first prepolymer comprisesone or more groups of amino, hydroxyl and a benzene ring. The invention further relates to a preparation method of the hydrophilic polyurethane carrier. Hydrophilcity of the hydrophilic polyurethanecarrier can be remarkably improved, so that microorganisms are adsorbed and fixed on the surface of the polyurethane carrier, and the preparation method is simple, convenient, easy and low in cost.

Description

technical field [0001] The invention belongs to the technical field of carrier surface modification, and in particular relates to a hydrophilic polyurethane carrier and its preparation method and application. Background technique [0002] As we all know, compared with traditional microbial technology, microbial immobilization technology has the advantages of high sewage treatment load, good effect, strong impact resistance, and low excess sludge production. It has become a research hotspot in the field of water treatment in recent years. [0003] The existing patent "a composite microorganism immobilized biological filler" (application number 201410840117.0) records a composite microorganism immobilized biological filler. The block-shaped polyurethane foam is adsorbed and loaded with composite microorganisms through extrusion adsorption embedding fluid, and the invention The compound microorganisms used in the test are applied, screened and domesticated in actual engineering...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/18C08J7/12C08L75/04C12N11/08
Inventor 邱松李昕阳魏令勇杨芳芳
Owner CHINA PETROLEUM & CHEM CORP
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