Membrane distillation device with effect of capacitive deionization based polarization alleviation

Abstract

The invention discloses a membrane distillation device with an effect of capacitive deionization based polarization alleviation. The membrane distillation device comprises a water inlet tank, a membrane distillation system and a water outlet tank. The membrane distillation system comprises a membrane distillation pipe, a hot-side thermostatic bath and a cold-side thermostatic bath. A capacitive deionization system and a hydrophobic membrane are parallelly and vertically arranged in the membrane distillation pipe. The capacitive deionization system comprises a first activated carbon electrode,a second insulating partition plate, a second activated carbon electrode and a first insulating partition plate in vertical parallel arrangement. The activated carbon electrodes are connected with positive and negative electrodes of a power source respectively. The insulating partition plates are in hollow net structures, and hollow cavities of the insulating partition plates are provided with hotliquid passages. A cold liquid passage is formed between the hydrophobic membrane and the adjacent membrane distillation pipe, and liquid in the hot liquid circulating passage and liquid in the coldliquid circulating passage flow oppositely. By the membrane distillation device with the effect of capacitive deionization based polarization alleviation, polarization in a membrane distillation process can be effectively solved, and the problems of flux reduction and water treatment capacity reduction due to membrane performance decline can be improved.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a membrane distillation device which uses capacitive deionization to reduce polarization. Background technique [0002] Membrane Distillation (MD) technology is a non-isothermal physical separation technology, which uses the vapor pressure difference on both sides of the hydrophobic porous membrane as the driving force, so that the steam molecules on the hot side pass through the membrane pores and then condense and enrich on the cold side. , can be regarded as a collection of membrane process and distillation process. It can be seen that the mass transfer process of membrane distillation separation is mainly composed of three stages: ① water evaporates on the hot feed liquid side of the membrane; ② water vapor migrates through the membrane pores; ③ water vapor condenses on the other side of the membrane . As a new type of high-efficiency separation technology, membrane distillat...

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a membrane distillation device that uses capacitive deionization to reduce polarization, which can solve the problems in the membrane distillation process. Membrane surface is easily contaminated, causing membrane pore blockage, flux drop and polarization problems

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