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Stuffing of controllable degradative macropore cellulose for carrying microbe in use for treating wastewater and preparation

A microbial carrier and wastewater treatment technology, applied in biological water/sewage treatment, water/sludge/sewage treatment, sustainable biological treatment, etc. low controllability and other problems, achieving the effect of low cost and simple preparation process

Inactive Publication Date: 2005-01-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size, pore size and specific surface area of ​​the carriers prepared by these methods are small (the particle size is not more than 1mm, and the pore size is between tens of μm and tens of μm). Quality efficiency, and the loaded microbial load is not high to reduce the treatment effect
In addition, there have been many patent reports at home and abroad on the preparation of cellulose sponges by adding pore-forming agents or foaming agents to cellulose solutions. Wastewater treatment under different microbial conditions is generally only used for cleaning and bathing

Method used

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  • Stuffing of controllable degradative macropore cellulose for carrying microbe in use for treating wastewater and preparation

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] Alkaline 10g of cellulose with 50ml of 20% NaOH solution for 1 hour, then add 5g of carbon disulfide and yellow it for 90 minutes at a temperature of 30°C to obtain cellulose xanthate, then add 5% NaOH solution to make the concentration of cellulose xanthate 10 % viscose solution, add 1.5g short cotton fibers and mix evenly, then add 6% foaming agent accounting for the total viscose mass and inject it into the mold for foaming at a temperature of 100°C, and finally regenerate in dilute sulfuric acid solution to obtain porous cellulose Carrier with an average pore size of 200μm, a porosity of 40%, and a specific surface area of ​​7m 2 / g. Dissolve 1g of ethylene glycol diglycidyl ether in 30ml of 0.5% NaOH solution, add 10g of absolute dry porous cellulose carrier to completely immerse and let it stand for 30min, then place the above mixture in a 60°C water bath and heat for 3 hours. Finally, the cross-linked body was taken out, rinsed with clean water, and dried at low...

example 2

[0018] The preparation of the viscose solution is the same as that of Example 1. Add 1 g of short cotton fibers to the viscose with a concentration of cellulose xanthate of 10% and mix evenly, then add 10% of the foaming agent accounting for the total viscose mass and inject it into the mold at a temperature of 120 ° C. Foaming, and finally regenerated in dilute sulfuric acid solution to obtain a porous cellulose carrier, with an average pore size of 300 μm, a porosity of 50%, and a specific surface area of ​​10 m 2 / g. Dissolve 5g of ethylene glycol diglycidyl ether in 30ml of 0.5% NaOH solution, add 10g of absolute dry porous cellulose carrier to completely immerse and let it stand for 30min, then place the above mixture in a water bath at 60°C for 3 hours, and finally The cross-linked body was taken out, rinsed with clean water, and dried at low temperature to obtain an absolute dry cross-linked cellulose carrier, which was degraded in a cellulase solution for 8 days, and t...

example 3

[0020] Alkaline 10g of cellulose with 50ml of 15% NaOH solution for 1 hour, add 3g of carbon disulfide and yellow it for 90 minutes at a temperature of 30°C to obtain cellulose xanthate, then add 5% NaOH solution to make the concentration of cellulose xanthate 8% viscose solution, add 0.5g short cotton fibers and mix evenly, then add foaming agent accounting for 12% of the total viscose mass, pour into the mold to foam at a temperature of 140°C, and finally regenerate in dilute sulfuric acid solution to obtain a porous cellulose carrier , the average pore diameter is 800μm, the porosity is 70%, and the specific surface area is 5m 2 / g. Dissolve 9g of ethylene glycol diglycidyl ether in 30ml of 0.5% NaOH solution, add 10g of absolute dry porous cellulose carrier to completely immerse and let it stand for 30min, then heat the above mixture in a water bath at 60°C for 3 hours, and finally The cross-linked body was taken out, rinsed with clean water, and dried at low temperature ...

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Abstract

Said filling is short cylinder-shaped, circular, block-shaped or schistose. The characteristics are: its specific superficial is 5m2 / g-10m2 / g, porosity is between 40 percent and 70 percent, carrier aperture is 100 um-1000 um. Said prepn. method includes macropore cellulose carrier prepn. and modifying process of carrier controlled degradation, the former is to make cellulose into cellulose viscose by alkalizing and yellowing, then to add in short cotton fibre and blowing agent to foam, macropore carrier filling of cellulose is produced by regenerating in weak sulphuric aci solution, the latter is to make the carrier and cross-linking agent ethanediol glycidyl ether cross-linked to realize controlled modifying of degradation speed.

Description

technical field [0001] The invention relates to a preparation method of a controllable-degradable cellulose macroporous microbial carrier filler for wastewater treatment, which belongs to the technical field of wastewater treatment fillers. Background technique [0002] Porous particle suspension carrier is a new type of high-efficiency carrier filler in biofilm treatment of wastewater. It has many advantages such as large specific surface area, high microbial growth concentration, small shape resistance, and low fluidization energy consumption. It is the development direction of wastewater treatment carriers. one. The materials of porous carriers currently used are mainly fillers such as granular activated carbon, zeolite, anthracite, ceramic balls, porous stainless steel or polyvinyl chloride. These fillers are used as water treatment carriers or have high cost and complicated processing technology (such as activated carbon and porous stainless...

Claims

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Application Information

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IPC IPC(8): C02F3/10
CPCY02W10/10
Inventor 康勇孔新军
Owner TIANJIN UNIV
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