Membrane distillation device capable of alleviating inorganic membrane pollution by using pulsed electric field

Abstract

The invention discloses a membrane distillation device capable of alleviating inorganic membrane pollution by using a pulsed electric field. The device includes a water inlet pool, a pulsed electric field system, a membrane distillation system and a water outlet pool; the membrane distillation system includes a membrane distillation pipe body, a hot side thermostatic bath and a cold side thermostatic bath; the membrane distillation pipe body is vertically provided with an active carbon electrode, an insulating baffle plate and a hydrophobic membrane; the insulating baffle plate is in a hollowreticular structure, and the hollow cavity of the insulating baffle plate is a hydrothermal channel; the surface of the hydrophobic membrane is coated with a conductive material, and the hydrophobic membrane and the active carbon electrode are respectively connected to the negative pole or positive pole of the pulsed electric field system; the pulsed electric field system can form an alternative pulsed electric field and pulsed magnetic field between the active carbon electrode and the hydrophobic membrane; and the liquids in a hydrothermal circulation pathway and a cold-liquid circulation pathway are in inverse flowing. The device can solve the problems of membrane hole blockage due to the pollution on membrane surfaces and membrane performance reduction due to flux depression.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a membrane distillation device which uses a pulsed electric field to slow down inorganic membrane pollution. Background technique [0002] Membrane Distillation (MD) technology is a non-isothermal physical separation technology that uses the vapor pressure difference on both sides of a hydrophobic porous membrane as the driving force to make the steam molecules on the hot side pass through the membrane pores and 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, compared ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is to provide a membrane distillation device that uses a pulsed electric field to slow down inorganic membrane fouling, which can solve the problem of membrane distillation in the membrane distillation process. The surface of the membrane is easily polluted, resulting in the clogging of the membrane pores, the decrease of the flux, and the decrease of the membrane performance

Images