Membrane distillation device with electrified self-heating function

Abstract

The invention discloses a membrane distillation device with an electrified self-heating function. The device comprises two loops which are a heat circulation loop and a cold circulation loop, whereinthe heat circulation loop is powered by a hot side peristaltic pump, and forms a loop with a feed water tank and a membrane module. The cold circulation loop is powered by a cold side peristaltic pump, and forms a loop together with the membrane module, a distilled water tank and a condensation tank, the real-time mass change of the distilled water tank is measured by a balance and measurement software to determine the membrane flux change, a conductivity meter is used to monitor the electric conductivity change of a distilled liquid in real time, the feeding side membrane surface in the membrane module is connected with electrodes and a power supply, a membrane used in the invention is a carbon nanotube-PTFE composite membrane, and the device can release a large amount of heat after beingelectrified, and automatically heats the liquid flowing through the module. The composite membrane can alleviate the original membrane pollution and membrane wetting phenomena of the PTFE membrane, also can greatly reduce the energy consumption, and has a very good development prospect.

Description

technical field [0001] The invention belongs to the field of membrane treatment of wastewater, and in particular relates to a membrane distillation device that is self-heating when energized. Background technique [0002] With the development of the world economy and the explosive growth of population, the demand for water is increasing. As the world's most populous country, my country's per capita fresh water only accounts for a quarter of the world's per capita, and it is the most water-scarce country in the world. One of the countries in China, the demand for water, especially fresh water, is more urgent, and water is also an important resource to promote industrial development. If seawater with high salinity can be effectively desalinated and treated, it will be an important source of supplementary industrial and domestic water, and membrane technology treatment is currently an important means of desalination of seawater, and as an emerging sewage treatment technology, it...

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Problems solved by technology

[0005] However, compared with other membrane technologies, the water flux of membrane distillation is low, and the chemical and thermal stability of PTFE (polytetrachloroethylene), PP (polypropylene), and PVDF (polyvinylidene chloride) currently on the market are insufficient. Moreover, if it is used alone to treat organic wastewater, it is easy to cause membrane wetting, resulting in a decline in the quality of the effluent.

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