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Method for reinforcing performance of ultrafiltration membrane by using bismuth-modified zeolite precoated layer

A modified zeolite and pre-coating technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low organic matter removal rate and ultrafiltration membrane fouling, so as to improve anti-pollution ability and delay Membrane fouling and low equipment requirements

Active Publication Date: 2014-11-19
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The combination of ultrafiltration-reverse osmosis membrane is also a combined process commonly used in the field of membrane technology today, and the treatment effect is better. The ultrafiltration membrane can reduce the pollution of the subsequent reverse osmosis membrane, but after a certain period of operation, the ultrafiltration membrane will also inevitably polluted
Therefore, there are still some limitations in the actual operation of ultrafiltration membranes. A key issue in its application is how to effectively control membrane fouling and prolong the service life of ultrafiltration membranes. low rate of defects

Method used

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  • Method for reinforcing performance of ultrafiltration membrane by using bismuth-modified zeolite precoated layer
  • Method for reinforcing performance of ultrafiltration membrane by using bismuth-modified zeolite precoated layer
  • Method for reinforcing performance of ultrafiltration membrane by using bismuth-modified zeolite precoated layer

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Embodiment 1

[0031] Example 1 (Using the bismuth-modified zeolite pre-coating method of the present invention to enhance the performance of ultrafiltration membranes, abbreviated as 0.03 Bi-Z-UF):

[0032] The raw water is the tail water of an industrial sewage treatment plant (COD 58mg / L, TN 19.2mg / L). The preparation method of bismuth-modified zeolite pre-coating material is as follows: (1) Add zeolite with a particle size of 1000 mesh into 0.1 mol / L sulfuric acid at a solid-to-liquid ratio of 1:5, and dynamically immerse it for 18 hours at an oscillation speed of 20 r / min. Pour out the supernatant, wash it once with pure water, and dry it at 85°C after pouring out the supernatant; (2) Add the zeolite prepared in step (1) to a 0.03 mol / L bismuth nitrate solution, dynamically immerse at an oscillation speed of 200r / min for 18h, pour out the supernatant and dry at 85°C; (3) put the zeolite prepared in step (2) at 450°C Calcining at lower temperature for 3 hours to obtain the bismuth-mod...

Embodiment 2

[0033] Example 2 (Using the bismuth-modified zeolite pre-coating method of the present invention to enhance the performance of ultrafiltration membranes, abbreviated as 0.08 Bi-Z-UF):

[0034]The raw water is the tail water of an industrial sewage treatment plant (COD 58mg / L, TN 19.2mg / L). The preparation method of bismuth-modified zeolite pre-coating material is as follows: (1) Add zeolite with a particle size of 1000 mesh into 0.1 mol / L sulfuric acid at a solid-to-liquid ratio of 1:5, and dynamically immerse it for 18 hours at an oscillation speed of 20 r / min. Pour out the supernatant, wash it once with pure water, and dry it at 85°C after pouring out the supernatant; (2) Add the zeolite prepared in step (1) with a solid-to-liquid ratio of 1:5 into the mol / L bismuth nitrate solution, dynamically immerse at an oscillation speed of 200r / min for 18h, pour out the supernatant and dry at 85°C; (3) put the zeolite prepared in step (2) at 450°C Calcining at lower temperature for...

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Abstract

The invention discloses a method for reinforcing performances of an ultrafiltration membrane by using a bismuth-modified zeolite precoated layer. A bismuth-modified zeolite is added into raw water through a drug adding device. A solution containing a bismuth-modified zeolite precoated layer material and the raw water pass through an ultrafiltration membrane assembly so that a more effective precoated layer can form on a surface of the ultrafiltration membrane. Thick water from the ultrafiltration membrane flows back to a raw water tank. After one filtering period is finished, the ultrafiltration membrane is subjected to a backwashing process and a positive washing process through water. The method is easy to control, is low in requirement of equipment, and can not only effectively alleviate a decrease speed of membrane flux and improve an anti-pollution capability of the ultrafiltration membrane but also increase removal efficiency on organic substances.

Description

technical field [0001] The invention belongs to the field of sewage advanced treatment and reuse engineering, and relates to a method for ultrafiltration membrane advanced treatment. Background technique [0002] Membrane technology is more and more widely used in the field of advanced sewage treatment and reuse. The advantages of ultrafiltration technology are simple operation, relatively low cost, no phase change, etc., and the ultrafiltration equipment occupies a small area and the system energy consumption is low. , low operating costs, and can effectively improve corporate benefits, ultrafiltration membrane technology has become one of the most important hot technologies in the field of water treatment in the past 20 years. The ultrafiltration combined process has a great effect on improving the removal rate of wastewater by ultrafiltration. Many researchers have found that the combination of powdered activated carbon and ultrafiltration can improve the removal rate of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00C02F1/44
Inventor 陈勇涂勇唐敏白永刚吴海锁陆嘉昂张耀辉徐军张龙
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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