Water treatment method and device for reducing membrane pollution

A water treatment and membrane pollution technology, applied in water/sewage treatment, water/sludge/sewage treatment, permeation/dialysis water/sewage treatment, etc., to simplify the structure, reduce the equipment footprint, and high promotion and application value Effect

Pending Publication Date: 2021-12-21
CRRC TANGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the membrane fouling problem existing in the existing membrane water treatment technology, the present invention provides a water treatment method and device for reducing membrane fouling, the method simplifies the membrane water treatment process, and improves the water treatment efficiency At the same time, the pollution rate in the membrane pores is reduced, the service life of the membrane is extended, and the operating cost of the membrane water treatment process is significantly reduced.

Method used

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  • Water treatment method and device for reducing membrane pollution
  • Water treatment method and device for reducing membrane pollution
  • Water treatment method and device for reducing membrane pollution

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A device for water treatment method for reducing membrane fouling, such as figure 1 As shown, the device includes a coagulation tank 1 and a filter device 2; the top of the coagulation tank 1 is provided with a coagulant inlet and a potential adjustment port 17, an agitator 14 is provided inside, and a water inlet pipe 11 and a first discharge pipe are connected at the bottom. The empty pipe 13 is connected with the water outlet pipe 12 on the side wall; the filter device 2 is connected with the other end of the water outlet pipe 12, and the bottom is connected with the second emptying pipe 23, and a membrane module 21 is arranged inside, and the clear liquid outlet of the membrane module 21 is connected with the filter The filtrate outlet 22 of the device 2 is connected, and the membrane hole in the membrane module 21 is 30nm;

[0028] Wherein, the coagulant inlet is communicated with the coagulant medicine box 16 for adding coagulant to the coagulation tank 1;

[002...

Embodiment 2

[0037] Utilize the device among the embodiment 1 to carry out water treatment, wherein the membrane module 21 in the filtration layer device is replaced into the membrane module that membrane hole is 60nm, and specific method comprises the following steps:

[0038] Pass into the water to be treated (the river water in the embodiment 1) in the coagulation tank 1 by water inlet pipe 11, when the liquid level in the coagulation tank 1 reaches the position of 2 / 3 of the height of the coagulation tank 1, stop feeding to the coagulation tank 1 Feed into the water to be treated in the coagulation tank 1, then add ferric chloride to the water to be treated for coagulation according to the addition of 5 mg / L through the coagulant medicine box 16, and control the coagulation by adjusting the rotating speed of the agitator 14 and the coagulation time. When the particle size meter 15 shows that the particle size of the coagulated particles reaches 180nm, slowly add NaOH solution to the coa...

Embodiment 3

[0041] Utilize the device among the embodiment 1 to carry out water treatment, wherein the membrane module 21 in the filtration layer device is replaced into the membrane module that membrane hole is 80nm, and specific method comprises the following steps:

[0042] In the coagulation tank 1, feed water to be treated (river water in embodiment 1) through the water inlet pipe 11, and when the liquid level in the coagulation tank 1 reached the position of 2 / 3 of the coagulation tank 1 height, stop feeding to the coagulation tank 1 Pass into the water to be treated in the coagulation tank 1, then add PAC (polyaluminium chloride) to the water to be treated by the coagulant medicine box 16 according to the addition of 10mg / L to carry out coagulation, by adjusting the rotating speed and mixing speed of the agitator 14 The coagulation time controls the particle size of the coagulation particles. When the particle size meter 15 shows that the particle size of the coagulation particles r...

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Abstract

The invention relates to the technical field of water treatment, and particularly discloses a water treatment method and device for reducing membrane pollution. The water treatment method for reducing membrane pollution comprises the following steps: adding a coagulant into to-be-treated water for coagulation, and after the particle size and potential of coagulation particles are controlled to reach expected values, filtering by using a filtering membrane, wherein the pore size of the filtering membrane is less than or equal to 100 nm. The device comprises a coagulating pool and a filtering device. According to the water treatment method for reducing membrane pollution provided by the invention, the specific filtering membrane pore size is adopted, and the coagulation particles in the coagulation system are controlled to reach the specific particle size and potential value at the same time, so that the membrane pollution in the water treatment process can be effectively reduced, under the condition of omitting the precipitation process, the service cycle and the service life of the filtering membrane can be remarkably prolonged and the water production flux of the membrane can be remarkably improved, and the method has extremely high popularization and application values in a membrane-method water treatment technology.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a water treatment method and device for reducing membrane fouling. Background technique [0002] In recent years, membrane water treatment technology has developed rapidly and has been widely used in practical engineering, but membrane fouling has always been the main reason limiting its further development and application. Membrane fouling refers to the phenomenon that the membrane permeability decreases due to the accumulation of impurities (physical, chemical and biological substances) in the solution on the surface of the membrane material or inside the membrane during the filtration process. Membrane fouling will lead to a decrease in membrane separation performance, increase process operating costs, and reduce operating efficiency. Therefore, in order to reduce membrane fouling, it is particularly important to adopt pretreatment technology before membrane filtratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F1/52
CPCC02F1/5236C02F1/5245C02F1/44
Inventor 王贵国张华杨雪峰刘民军李硕谷朝阳孙志超杨涛付青云吕兴
Owner CRRC TANGSHAN CO LTD
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