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Membrane flux restoration method after separation membrane filters pcb wastewater

A recovery method and technology of membrane flux, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of blocking membrane, unable to restore membrane flux, etc., achieve simple operation, expand the application market, extend the Effect of expiry date

Active Publication Date: 2021-08-17
埃姆媞(无锡)分离技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual operation process of membrane separation technology to treat PCB wastewater, because PCB wastewater contains a large amount of sludge and runs for a long time, it is polluted by suspended solids or insoluble salts in the influent, which inevitably blocks the membrane, resulting in membrane flux. At this time, the membrane element needs to be cleaned, and the membrane flux cannot be recovered by conventional physical cleaning.

Method used

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  • Membrane flux restoration method after separation membrane filters pcb wastewater
  • Membrane flux restoration method after separation membrane filters pcb wastewater
  • Membrane flux restoration method after separation membrane filters pcb wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1 proposes a kind of membrane flux restoration method after separation membrane filters PCB waste water, comprises the following steps:

[0018] (1) Lead the flushing water into the cleaning water tank of the separation equipment, then turn on the cleaning equipment for low-pressure circular flushing, and then use a conductivity meter to measure the conductivity of the discharge outlet water. When the conductivity of the discharge outlet water is 10% of the conductivity of the inlet water, Stop flushing. Among them, the time for low-pressure circular flushing is 25 minutes, the inlet water pressure is 3 bar, and low-pressure circular flushing is performed 3 times. The water is product water with hardness removed, free of metal ions and residual chlorine, and the cleaning temperature is 25°C.

[0019] (2) Add sodium hydroxide powder in water, adjust the pH to be 12.5, obtain the first cleaning solution, then open the cleaning equipment and carry out circular ...

Embodiment 2

[0024] Embodiment 2 proposes a kind of membrane flux recovery method after separation membrane filters PCB waste water, comprises the following steps:

[0025] (1) Lead the flushing water into the cleaning water tank of the separation equipment, then turn on the cleaning equipment for low-pressure circular flushing, and then use a conductivity meter to measure the conductivity of the discharge outlet water. When the conductivity of the discharge outlet water is 20% of the conductivity of the inlet water, Stop flushing. Among them, the time of low-pressure circular flushing is 15 minutes, the inlet water pressure is 4 bar, and low-pressure circular flushing is performed twice. The water is deionized water that removes hardness and does not contain metal ions and residual chlorine, and the cleaning temperature is 30°C.

[0026] (2) Add sodium hydroxide powder in water, adjust the pH to be 11.5, obtain the first cleaning solution, then open the cleaning equipment and carry out c...

Embodiment 3

[0031] Embodiment 3 proposes a kind of membrane flux restoration method after separation membrane filters PCB waste water, comprises the following steps:

[0032] (1) Lead the flushing water into the cleaning water tank of the separation equipment, then turn on the cleaning equipment for low-pressure circular flushing, and then use a conductivity meter to measure the conductivity of the water at the discharge outlet. When the conductivity of the water at the discharge outlet is 15% of the conductivity of the inlet water, Stop flushing. Among them, the time for low-pressure circular flushing is 20 minutes, the inlet water pressure is 4 bar, and low-pressure circular flushing is performed twice. The water is product water with hardness removed, free of metal ions and residual chlorine, and the washing temperature is 27°C.

[0033](2) Add sodium hydroxide powder in water, adjust the pH to be 12, obtain the first cleaning solution, then open the cleaning equipment and carry out c...

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Abstract

The invention relates to a method for recovering membrane flux after a separation membrane filters PCB waste water, which includes one physical cleaning and three chemical cleanings. In the membrane flux recovery method after the separation membrane filters PCB waste water of the present invention, only isobaric flushing is used in the cleaning process, and no backwashing device is needed; the cleaning water is clean, hardness-removed, and does not contain metal ions and residual chlorine. The product water avoids secondary pollution of the membrane elements; the cleaning working pressure is lower than or equal to 4bar, the energy consumption is low, and the operation is simple. Through the combination of physical cleaning and chemical cleaning, select a specific cleaning agent, and completely restore the flux of the special separation membrane polluted by PCB wastewater, thereby greatly reducing the use cost of the membrane module, prolonging the service life of the membrane element, and expanding the membrane module. application market.

Description

technical field [0001] The invention relates to a method for recovering membrane flux after a separation membrane filters PCB waste water. Background technique [0002] With the rapid development of industrialization, the water pollution brought about seriously affects people's living environment and restricts social and economic development. Therefore, membrane separation technology, as a high-tech separation technology in the field of water treatment, has been rapidly developed and widely used. Membrane separation is to use the selective permeability of the membrane to achieve the separation, purification and concentration of different components of the feed liquid. The difference between membrane separation and traditional filtration is that the membrane can be separated in the molecular range, and this process is a kind of Physical process, no phase change and no need to add additives. Membrane separation technology is a high-tech engineering technology for humans to so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/02C02F1/44
CPCB01D65/02B01D2321/16B01D2321/164B01D2321/168C02F1/44C02F2303/16
Inventor 姜艳
Owner 埃姆媞(无锡)分离技术有限公司
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