A method for enhancing the performance of ultrafiltration membranes by using bismuth-modified zeolite precoating

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

Active Publication Date: 2016-07-06
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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  • A method for enhancing the performance of ultrafiltration membranes by using bismuth-modified zeolite precoating
  • A method for enhancing the performance of ultrafiltration membranes by using bismuth-modified zeolite precoating
  • A method for enhancing the performance of ultrafiltration membranes by using bismuth-modified zeolite precoating

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Embodiment 1

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

[0032] The raw water is the tail water of an industrial sewage treatment plant (COD58mg / L, TN19.2mg / L). The preparation method of bismuth-modified zeolite pre-coating material is as follows: (1) Add zeolite with a particle size of 1000 mesh to 0.1mol / L sulfuric acid at a solid-to-liquid ratio of 1:5, and dynamically immerse it for 18 hours at an oscillation speed of 20r / 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-modif...

Embodiment 2

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

[0034]The raw water is the tail water of an industrial sewage treatment plant (COD58mg / L, TN19.2mg / L). The preparation method of bismuth-modified zeolite pre-coating material is as follows: (1) Add zeolite with a particle size of 1000 mesh to 0.1mol / L sulfuric acid at a solid-to-liquid ratio of 1:5, and dynamically immerse it for 18 hours at an oscillation speed of 20r / 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 a container containing 0.08 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...

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Abstract

The invention discloses a method for enhancing the performance of an ultrafiltration membrane by using a bismuth-modified zeolite pre-coating layer. The bismuth-modified zeolite is added to the raw water through a dosing device, and the bismuth-modified zeolite pre-coating material solution is used together with the raw water. Through the ultrafiltration membrane module, a more effective pre-coating can be formed on the surface of the ultrafiltration membrane, and the concentrated water of the ultrafiltration membrane is returned to the original water pool. After a filtration cycle, the ultrafiltration membrane is backwashed and flushed with water. The operation of the method is easy to control, and the equipment requirements are low, which can not only effectively slow down the decrease rate of the membrane flux, improve the anti-pollution ability of the ultrafiltration membrane, but also increase the removal efficiency of organic matters.

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 Patents(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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