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Method for slowing down membrane pollution by utilizing nano-bubble aeration

A technology of nano-bubbles and membrane fouling, applied in the field of membrane cleaning, can solve problems such as unsatisfactory membrane fouling, decreased flux, and obstacles to large-scale promotion

Inactive Publication Date: 2017-09-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the serious membrane fouling problem hinders the large-scale promotion of this technology.
How to solve the problem of flux drop caused by membrane fouling during membrane operation has become the biggest problem for better and more economical use of membrane technology to treat various types of wastewater
The existing traditional method to reduce membrane pollution is the microporous aeration method, which is simple and easy to implement, but the control of membrane fouling is not ideal, and the online microporous aeration method cannot achieve a good slowing flux Decrease and reduce the effect of membrane fouling

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for on-line cleaning of polyvinylidene fluoride (PVDF) flat membrane and curtain-type hollow fiber membrane modules using nano-bubble method to treat ternary oil recovery wastewater, the process is: immerse the flat membrane or curtain-type hollow fiber membrane in the membrane device in (if attached figure 1 As shown); the nanobubble nozzles are arranged as shown in the figure, the distance between the gas outlet of the nozzles perpendicular to the membrane and the membrane surface is kept at 5 cm, and a group is arranged every 10 cm from the center of the board along the length of the board; and the nozzles whose bottom ends are parallel to the membrane are also It is symmetrically arranged, the top of the nozzle is 3cm away from the bottom of the membrane, and a group is arranged every 5cm from the center of the bottom of the plate along the width of the plate; while the membrane is being filtered, the gas nano-bubble generator is turned on, and the air-water...

Embodiment 2

[0032] A method for on-line cleaning of polyvinylidene fluoride (PVDF) flat membrane and curtain-type hollow fiber membrane modules using nano-bubble method to treat ternary oil recovery wastewater, the process is: immerse the flat membrane or curtain-type hollow fiber membrane in the membrane device in (if attached figure 1 shown); the nanobubble nozzles are arranged as shown in the figure, and the distance between the gas outlet of the nozzles perpendicular to the membrane and the membrane surface is kept at 10 cm, and a group is arranged every 15 cm from the center of the board along the length of the board; and the nozzles whose bottom ends are parallel to the membrane are also It is symmetrically arranged, the top of the nozzle is 7cm away from the bottom of the membrane, and a group is arranged every 10cm from the center of the bottom of the plate along the width of the plate; while the membrane is filtering, the nano-bubble generating device is turned on, and the air-wat...

experiment example 3

[0034] A kind of online cleaning method of polytetrafluoroethylene (PTFE) tubular membrane that uses nano-bubble method to process fishmeal processing waste water, its process is: connect nano-bubble nozzle directly to the water inlet of tubular membrane module (as attached figure 2 As shown), the top of the nozzle extends into the water inlet 1cm; while the membrane is being filtered, the nano-bubble generator is turned on, the gas-water ratio is adjusted to 1:10-1:40, and the diameter of the nano-bubbles is controlled within 200 nanometers. This method can make The flux of the PTFE membrane is always maintained above 92.4%. And under the same conditions, only change the distance from the top of the nozzle into the water inlet to 2cm, this method can keep the flux of the polytetrafluoroethylene membrane above 93.7% all the time.

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Abstract

The invention provides a method for slowing down membrane pollution by utilizing nano-bubble aeration, which can greatly improve a membrane anti-pollution capability and maintaining efficient and stable flux. Nano-bubbles are generated by utilizing a method combining pressurized air dissolution and hydraulic shearing; a generation device is composed of parts including a water tank, an air-liquid mixing water pump, nano-bubble spraying nozzles and the like. In order to realize the aim of slowing down the membrane pollution, the technical scheme adopted by the invention is as follows: the nano-bubble spraying nozzles are arranged on a membrane surface of each material and each type of membrane device according to certain distance and angle; in an operation process of the membrane device, the nano-bubble generation device is started at the same time to generate nano-bubbles with certain air-water ratio and diameter and the nano-bubbles are used for washing the membrane surface and membrane pores, so that a traditional micro-pore aeration manner is replaced and the aim of slowing down a membrane pollution degree caused by pollutants in water in a membrane operation process is realized. The angle between each nano-bubble spraying nozzle and the corresponding membrane device is preferably set to be a vertical state.

Description

technical field [0001] The invention belongs to the technical field of membrane cleaning, and in particular relates to a method for a nano-bubble generating device to slow down membrane fouling during membrane operation. Background technique [0002] As a water treatment technology, membrane technology has the advantages of good effluent quality, small footprint and high degree of automation in the advanced treatment of wastewater. Based on the above advantages, membrane treatment has been widely used in feed water treatment and various wastewater advanced treatment processes. However, the serious membrane fouling problem hinders the large-scale promotion of this technology. How to solve the problem of flux drop caused by membrane fouling during membrane operation has become the biggest problem for better and more economical use of membrane technology to treat various types of wastewater. The existing traditional method to reduce membrane pollution is the microporous aerat...

Claims

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Application Information

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IPC IPC(8): B01D65/02B01D65/06C02F1/44
CPCB01D65/02B01D65/06B01D2321/18C02F1/44C02F2303/16
Inventor 李攀于水利徐斌张国晟龚超
Owner TONGJI UNIV