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Preparation method and application of hydrophilic polyurethane porous carrier

A hydrophilic polyurethane and porous carrier technology, applied in the field of water treatment, can solve the problems of no large-scale application, limited microbial immobilization, weak microbial immobilization, etc., and achieves the effects of easy operation, superior economy, and firm adsorption.

Inactive Publication Date: 2012-06-27
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the surface of the carrier used in the market is basically a hydrophobic material. The immobilization of microorganisms on the surface has the disadvantages of instability and long film-hanging period, and the specific surface area is small, and the amount of immobilized microorganisms is limited.
Among them, foamed polyurethane has a large relative area and is easy to foam, and has been used in sewage treatment. However, the surface of the carrier is hydrophobic, and the amount of microbial immobilization is limited, so it has not been applied on a large scale.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First, multiple cubes of porous polyurethane with a side length of 1.5 cm were treated in an ozone environment of 0.2 atm·L / h with stirring and at room temperature for one hour, and then the carrier was immersed in deionized water for 30 minutes to remove free radicals; the cerium Add it to the sulfuric acid aqueous solution with a concentration of 0.2mol / L to prepare a concentration of 4.4×10 -5 mol / L cerium sulfate aqueous solution, then add acrylic acid with a mass fraction of 3.75% of the above cerium sulfate aqueous solution, and prepare an acrylic acid sulfuric acid aqueous solution containing tetravalent cerium ions as a modifier, immerse the carrier in it, pass nitrogen protection, and stir. The temperature was controlled at 50 °C and kept for four hours. After the reaction between the modifier and the porous polyurethane surface was complete, a layer of grafted polyacrylic acid was formed on the surface of the carrier, and deionized water was used to wash away t...

Embodiment 2

[0018] First, multiple cubes of porous polyurethane with a side length of 1.5 cm were treated in an ozone environment of 0.3 atm·L / h with stirring and at room temperature for one hour, and then the carrier was immersed in deionized water for 40 minutes to remove free radicals; the cerium It was added into the sulfuric acid aqueous solution with a concentration of 0.3mol / L, and the concentration was 4.2×10 -5 mol / L cerium sulfate aqueous solution, then add acrylic acid with a mass fraction of 7.5% of the above-mentioned cerium sulfate aqueous solution to prepare an acrylic acid sulfuric acid aqueous solution containing tetravalent cerium ions as a modifier, immerse the carrier in it, pass nitrogen protection, and stir. The temperature is controlled at 45 °C under the condition of five hours, and after the reaction between the modifier and the surface of the porous polyurethane is complete, a layer of grafted polyacrylic acid is formed on the surface of the carrier, and the oligo...

Embodiment 3

[0020] First, a plurality of cubic porous polyurethanes with a side length of 2 cm were treated in an ozone environment of 0.4 atm·L / h with stirring and room temperature for one hour, and then the carrier was immersed in deionized water for 50 minutes to remove free radicals; cerium was added to In the sulfuric acid aqueous solution with a concentration of 0.4mol / L, the concentration is 4.8×10 -5 mol / L cerium sulfate aqueous solution, then add acrylic acid with a mass fraction of 7% of the above-mentioned cerium sulfate aqueous solution, and prepare an acrylic acid sulfuric acid aqueous solution containing tetravalent cerium ions as a modifier, immerse the carrier in it, pass nitrogen protection, and stir. In this case, the temperature was controlled at 65 °C and kept for 3.5 hours. After the reaction between the modifier and the porous polyurethane surface was complete, a layer of grafted polyacrylic acid was formed on the surface of the carrier, and the oligomers and adsorbed...

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PUM

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Abstract

The invention belongs to the technical field of water processing, and discloses a preparation method and an application of a hydrophilic polyurethane porous carrier. According to the invention, foamed polyurethane processed through an ozone surface treatment is subject to surface grafting copolymerization modification by using an acrylic acid and sulfuric acid aqueous solution with quadravalent cerium ions as an initiator. A reaction is carried out for a certain period of time; and the porous polyurethane carrier is washed and dried. With the method, a fixed microbial amount of the hydrophilic porous polyurethane is improved by approximately 60%. The hydrophilic porous polyurethane is convenient to process. Film forming speed of the modified porous polyurethane is improved, wherein film forming can be accomplished in 2-3 days. Compared to traditional water processing carriers, with the hydrophilic polyurethane porous carrier, film forming time is reduced, workload is reduced, and the preparation technology is simple. The hydrophilic polyurethane porous carrier can resist shock load.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a preparation method and application of a hydrophilic polyurethane porous carrier for surface modification of polyurethane by using a hydrophilic material. Background technique [0002] With the strict environmental protection requirements year by year, the traditional sewage biological treatment process has problems such as low COD removal efficiency and poor nitrification efficiency, especially for some wastewater with high ammonia nitrogen content, the removal effect is not ideal, and it is difficult to achieve increasingly strict sewage treatment. Discharge standards, many of the domestic sewage treatment plants that have been built are facing the problem of improving treatment capacity and improving treatment indicators. Under the condition that the existing structures remain unchanged, it is a simple and effective method to improve the processing capacit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00
Inventor 邢新会王天民冯权毕鲜荣
Owner TSINGHUA UNIV
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