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Backwashing membrane distillation device based on dielectric wetting membrane and operation mode

A technology of dielectric wetting and operation mode is applied in the field of backwashable membrane distillation devices and operation modes, which can solve the problems of backwashing and membrane distillation system failure, and achieve simple operation, broad application prospects and low energy consumption of the device. Effect

Active Publication Date: 2020-05-29
HOHAI UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0003] Purpose of the invention: The purpose of the invention is to provide a backwashable membrane distillation device and its operating mode based on a dielectric wetting membrane, which solves the problem that the membrane distillation system cannot be backwashed with liquid water

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  • Backwashing membrane distillation device based on dielectric wetting membrane and operation mode
  • Backwashing membrane distillation device based on dielectric wetting membrane and operation mode
  • Backwashing membrane distillation device based on dielectric wetting membrane and operation mode

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with accompanying drawing.

[0020] like Figure 1 to Figure 3 As shown, the present invention includes a vacuum membrane distillation reactor 4, one side of the vacuum membrane distillation reactor 4 is connected to the seawater side device, and the other side is connected to the fresh water side device. like figure 2 As shown, the vacuum membrane distillation reactor 4 includes two plexiglass plates 401, a dielectric wetting film 402, a flow guide net 403 and an electrode 404, and the dielectric wetting film 402 is installed in the middle of the two plexiglass plates 401, and the flow guide The net 403 is placed in the water flow channel between the plexiglass plate 401 and the dielectric wetting film 402 , and the electrodes 404 are attached to both ends of the dielectric wetting film 402 , four in total. The four motors are evenly connected to the power supply 9, and an electrode switch S1-S4 is...

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Abstract

The invention discloses a backwashing membrane distillation device based on a dielectric wetting membrane and an operation mode. The device comprises a vacuum membrane distillation reactor, one side of the vacuum membrane distillation reactor is connected with a seawater side device; the other side is connected with a fresh water side device; and a dielectric wetting membrane is arranged in the vacuum membrane distillation reactor. The device is characterized in that the dielectric wetting membrane has a surface modification titanium mesh-hydrophobic film-surface modification titanium mesh structure. Suction filtration holes are formed in the two sides of the vacuum membrane distillation reactor, wherein the suction filtration holes located in the seawater side are connected with a vacuumpump, and the suction filtration holes located in the fresh water side are connected with a cleaning liquid bottle. Under the action of an electric field, a polytetrafluoroethylene membrane is converted into hydrophilicity from hydrophobicity, a cleaning liquid in the fresh water side passes through the dielectric wetting membrane in a liquid form, and thus membrane backwashing is achieved. The device can quickly and effectively recover the hydrophobicity of a membrane and improve the membrane flux, the operation of the device is simple, the energy consumption is low, the automation of the device is realized, and the device has a wide application prospect.

Description

technical field [0001] The invention relates to a membrane distillation seawater desalination device and its operating mode, in particular to a backwashable membrane distillation device and its operating mode based on a dielectric wetting membrane. Background technique [0002] Membrane distillation is a promising seawater desalination process. It uses a hydrophobic membrane as the medium, allowing only the water on the feed liquid side to pass through the distillation membrane in gaseous form, and liquefied into liquid water on the other side, so as to realize the separation of water and other non- Separation of volatile components. However, long-term operation will lead to membrane fouling and membrane wetting, which will reduce the water production rate and deteriorate the effluent quality, which greatly affects the extensive operation of the membrane distillation process. Membrane cleaning is a common method to restore membrane performance. However, the membrane distill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36C02F1/44C02F1/04C02F103/08
CPCB01D61/364C02F1/04C02F1/44C02F2103/08
Inventor 陈琳姜龙杰朱亮陈再煜
Owner HOHAI UNIV
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