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Diatomite/cellulose inorganic-organic composite filter aid for directly filtering micro-polluted water source as well as preparation method and application of diatomite/cellulose inorganic-organic composite filter aid

A technology of cellulose and diatomaceous earth, which is applied in the direction of separation methods, filtration separation, chemical instruments and methods, etc., can solve the problems of not very prominent filter aid effect, failure to meet expected requirements, rising costs, etc., to improve water production Efficiency, improvement of clarity, and reduction of filtration resistance

Inactive Publication Date: 2013-04-24
深圳武汉理工大研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used filter aids include diatomite, cellulose, etc., but each has its own advantages and disadvantages in practical applications: diatomite has the characteristics of developed pore structure, high hardness, good stability, and low chemical impurity content, but The filtration rate is relatively slow, and the bulk density is high. Adding according to its mass often fails to meet the expected requirements, and adding more will increase the cost
Patent No. 981268218 mentions the combined use of lignocellulose and diatomaceous earth as a filter aid, but the composite filter aid involved is only a simple physical mixture of diatomite and cellulose for use, not in the true sense Composite, the filter effect is not very prominent

Method used

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  • Diatomite/cellulose inorganic-organic composite filter aid for directly filtering micro-polluted water source as well as preparation method and application of diatomite/cellulose inorganic-organic composite filter aid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add water to 1 g of cellulose, and after it is completely infiltrated, filter it with suction and wash it with absolute ethanol several times to remove the residual moisture on the surface. Add the treated cellulose to 40mL of distilled water, then add 1mL of 1mol / L dilute sulfuric acid drop by drop, put it into a Erlenmeyer flask and place it in a constant temperature water bath at 60°C to keep warm, and manually stir it for prehydrolysis for 10 minutes to prepare solution A. Mix 1.5g of diatomaceous earth and 25mL of absolute ethanol (EtOH) into solution B, mix it into solution A, keep stirring for 10 minutes, add ammonia water to adjust the pH of the system to 7.5, react for 10 minutes, cool down to room temperature, and stir with a magnetic force The cellulose-diatomite sol was continuously stirred at a speed of 20r / min for 24h to obtain a cellulose-diatomaceous earth sol, filtered and washed to remove impurities, aged at 45°C for 24h to obtain a gel, and then dried ...

Embodiment 2

[0022] Add water to 1 g of cellulose, and after it is completely infiltrated, filter it with suction and wash it with absolute ethanol several times to remove the residual moisture on the surface. Add the treated cellulose to 40mL of distilled water, then add 1mL of 1mol / L dilute sulfuric acid drop by drop, put it into a Erlenmeyer flask and place it in a constant temperature water bath at 60°C to keep warm, and manually stir it for prehydrolysis for 10 minutes to prepare solution A. Mix 1.5g of diatomaceous earth and 30mL of absolute ethanol (EtOH) into solution B, mix it into solution A, keep stirring for 10 minutes, add ammonia water to adjust the pH of the system to 7.1, react for 10 minutes, cool down to room temperature, and continue stirring for 24 h, the cellulose-diatomite sol was prepared, filtered and washed to remove impurities, aged at 45°C for 24 h to obtain a gel, then put into a constant temperature drying oven at 110°C for 24 h, and ground into powder to obtain...

Embodiment 3

[0024] Add water to 1 g of cellulose, and after it is completely infiltrated, filter it with suction and wash it with absolute ethanol several times to remove the residual moisture on the surface. Add the treated cellulose to 30mL of distilled water, then add 1mL of 1mol / L dilute sulfuric acid dropwise, put it into a Erlenmeyer flask and place it in a constant temperature water bath at 80°C to keep it warm, and manually stir it for prehydrolysis for 15 minutes to prepare solution A. Mix 1.5g of diatomaceous earth and 30mL of absolute ethanol (EtOH) into solution B, mix it into solution A, keep stirring for 10 minutes, add ammonia water to adjust the pH of the system to 7.2, react for 8 minutes, cool down to room temperature, and continue stirring for 26 minutes. h, the cellulose-diatomaceous earth sol was obtained, filtered and washed to remove impurities, aged at 60°C for 24 h to obtain a gel, then put into a constant temperature drying oven at 110°C for 24 h, and ground into ...

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Abstract

The invention relates to the technical field of water supply treatment, and specifically relates to a diatomite / cellulose inorganic-organic composite filter aid for directly filtering micro-polluted water source as well as a preparation method and an application of the diatomite / cellulose inorganic-organic composite filter aid. The diatomite / cellulose inorganic-organic composite filter aid is characterized by carrying out pre-hydrolyzing, stirring and reacting on cellulose in the water at 50-90 DEG C; adding anhydrous ethanol dispersion of diatomite and stirring; then adding ammonia water to adjust the pH to an alkaline condition suitable for polycondensation of the cellulose; preserving the heat to carry out the polycondensation; stirring to obtain cellulose-diatomite sol; and ageing to obtain gel and then treating to obtain the diatomite / cellulose inorganic-organic composite filter aid. The diatomite / cellulose inorganic-organic composite filter aid for directly filtering the micro-polluted water source has the characteristics that the turbidity removal rate is high, the turbidity removal rate is only slightly reduced as the increase of the filtration speed, and the reduction is not obviously; and the diatomite / cellulose inorganic-organic composite filter aid can be used for accelerating the filtration speed and increasing the water production efficiency.

Description

technical field [0001] The invention relates to the technical field of water supply treatment, in particular to a diatomite / cellulose inorganic-organic composite filter aid for direct filtration treatment of slightly polluted water sources, a preparation method and an application thereof. Background technique [0002] With the continuous improvement of people's living standards and the increasingly rich material life, people's quality of life has taken a big leap forward, and people's requirements for the quality of drinking water and water are getting higher and higher, and safety and health have become the people's key concerns . However, with the shortage of water resources and the aggravation of water pollution, the reuse of water resources has become an urgent problem to be solved. [0003] Nowadays, slightly polluted water bodies have been increasingly used as one of the sources of water for people's daily life. Direct filtration is a commonly used water treatment pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30B01D37/02
Inventor 章蕾李孟黄凌凤
Owner 深圳武汉理工大研究院有限公司
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