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MBR plate-type membrane cleaning agent and cleaning method

A technology for cleaning chemicals and plate membranes, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of unrecoverable chemicals, uneven chemical cleaning, etc., to save dosing time and stabilize water flow. The effect of low volume and low production cost

Active Publication Date: 2020-03-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cleaning agent provided by the present invention includes alkaline cleaning agent and / or acidic cleaning agent, which can efficiently remove various pollutants remaining on the surface of the ultrafiltration membrane and in the membrane pores; the online cleaning method of the present invention will The cleaning agent is injected into the interior of the plate membrane, and then the residual cleaning agent in the membrane is recovered after standing still for aeration and scrubbing. On the one hand, it can overcome the shortcomings of the existing plate membrane chemical cleaning that is not uniform and the agent cannot be recovered. On the other hand, it is effective Improve the chemical cleaning intensity and the recovery rate of the mold performance after chemical cleaning, prolong the chemical cleaning cycle and service life of the MBR plate membrane system

Method used

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  • MBR plate-type membrane cleaning agent and cleaning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Taking the domestic sewage treated by a certain company as the raw water in this embodiment, the specific water quality data analysis is shown in Table 1:

[0070] Table 1

[0071] COD / ppm BOD / ppm Sludge concentration / ppm 2560 1480 4300

[0072] The above-mentioned sewage is treated by MBR plate membrane, and after 2-5 days of continuous operation, the cleaning agent and the online cleaning method of the present application are used for cleaning.

[0073] S1, preparation of alkaline cleaning agents, which includes the following components: sodium dodecylbenzenesulfonate 1wt%, sodium lauryl sulfate 0.5wt%, sodium hypochlorite 0.5wt% and MBR plate membrane treatment of the product water obtained, and use Sodium hydroxide adjusts the pH value to 10.5;

[0074] S2, stop the water production of the MBR plate membrane module, stop the aeration, and let stand for 10 minutes;

[0075] S3, open the dosing pipeline valve 11 and the membrane return tank ...

Embodiment 2

[0081] Taking Example 1 as the raw water of this embodiment, the above-mentioned sewage was treated with the MBR plate membrane, and after two months of continuous operation, the cleaning agent and the online cleaning method of the present application were used for cleaning.

[0082] S1, preparing an acid cleaning agent, which contains the following components: the content of activated carbon is 0.1wt%, the content of tetrasodium edetate is 2wt%; the content of sodium tripolyphosphate is 1wt%; the content of sodium sulfite is 1wt% , and the product water obtained by MBR plate membrane treatment, and adjust the pH value to 2 with citric acid;

[0083] S2, stop the water production of the MBR plate membrane module, stop the aeration, and let stand for 10 minutes;

[0084] S3, open the dosing pipeline valve 11 and the membrane return tank pipeline valve 17, open the cleaning agent dosing pump 9 and the cleaning agent return pump 15 to replace the water in the MBR plate membrane m...

Embodiment 3

[0090] Taking Example 1 as the raw water of this embodiment, the above-mentioned sewage was treated with MBR plate membrane, and after continuous operation for 6 months, the cleaning agent and online cleaning method of the present application were used for cleaning.

[0091] S1, preparation of alkaline cleaning agents, which includes the following components: 2wt% sodium dodecylbenzenesulfonate, 1wt% sodium dodecylsulfate, 2wt% sodium hypochlorite and the product water obtained by MBR plate membrane treatment, and oxidized with hydrogen Sodium adjusts the pH to 11;

[0092] S2, stop the water production of the MBR plate membrane module, stop the aeration, and let stand for 10 minutes;

[0093] S3, open the dosing pipeline valve 11 and the membrane return tank pipeline valve 17, open the cleaning agent dosing pump 9 and the cleaning agent return pump 15 to replace the water in the MBR plate membrane module, and stop the pump after 20 seconds;

[0094] S4, open the return water...

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Abstract

The invention discloses an MBR plate-type membrane cleaning agent, which comprises an alkaline cleaning agent and / or an acidic cleaning agent, and can efficiently remove various pollutants remained onthe surface and in the membrane pores of an ultrafiltration membrane. The invention also provides an MBR plate-type membrane cleaning method, wherein the cleaning agent is beaten into a plate-type membrane in a cross-flow circulation manner, standing aerating scrubbing is performed, and the residual cleaning agent in the membrane is recovered, so that the defects that the chemical cleaning of theexisting plate-type membrane is non-uniform and the agent cannot be recovered can be overcome, and the chemical cleaning strength and the membrane performance recovery rate after chemical cleaning are effectively improved so as to prolong the chemical cleaning period and the service life of the MBR plate-type membrane system.

Description

technical field [0001] The invention belongs to the technical field of organic ultrafiltration membrane sewage treatment, and in particular relates to an MBR plate membrane cleaning agent and an online circulation cleaning method. Background technique [0002] With the rapid development of social economy and the rapid increase of population, China's water resource problems are also becoming more and more serious. Improving the quality of the water environment is our top priority. Membrane bioreactor (MBR) technology is generally used in my country's sewage treatment. Because of its high effluent quality, stable structure and easy operation, it is widely used in the field of municipal water and industrial wastewater reuse, and is the most promising market. One of the wastewater treatment technologies, and the MBR plate membrane is one of the most important methods of the MBR technology, and the plate ultrafiltration membrane is the key to its use. [0003] However, during th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02B01D65/06C02F3/12
CPCB01D65/02C02F3/1268B01D2321/162B01D2321/164B01D2321/168C02F2303/16Y02W10/10
Inventor 任鹏飞奚振宇张新妙王玉杰彭海珠
Owner CHINA PETROLEUM & CHEM CORP
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