Conductive hydrophobic membrane and preparation method thereof, and electrothermal membrane distillation assembly containing same

Abstract

The invehe invention provides a conductive hydrophobic membrane and a preparation method thereof, and an electrothermal membrane distillation module containing the same. The conductive hydrophobic membrane comprises a hydrophobic microporous membrane layer and a porous conductive layer, wherein the porous conductive layer is formed on the hydrophobic microporous membrane layer. The conductive hydrophobic membrane is made into the membrane module for electrothermal membrane distillation; the hydrophobic microporous membrane layer of the conductive hydrophobic membrane is located at a feed liquid side, and the graphene conductive layer of the conductive hydrophobic membrane is located at a water production side; and an air gap type, an air sweeping type or vacuum condensing structure is adopted at the water production side. The porous conductive layer converts electrical energy into thermal energy during distillation of an electrothermal membrane, and the thermal energy is transmitted tothe feed liquid side for heating of feed liquid. According to the invention, energy input for feed liquid heating and feed liquid circulation in the process of membrane distillation can be reduced; the problem of membrane pore wetting caused by capillary condensation in the process of membrane distillation can be alleviated; the membrane can be rapidly dried after the membrane is wetted and cleaned; and long-term low-consumption stable operation of membrane distillation technology is realized.

Description

technical field [0001] The invention belongs to the field of water treatment and industrial desalination, specifically relates to the technical field of electrothermal process and membrane separation, and in particular relates to a conductive hydrophobic membrane, its preparation method and an electrothermal membrane distillation assembly containing it, so as to reduce the operating energy consumption of the membrane distillation process, Relieves membrane wetting and enables rapid membrane drying. Background technique [0002] Membrane distillation is an emerging membrane separation process in recent years. Membrane distillation technology can be used in sewage and wastewater treatment, seawater and brackish water desalination, salt crystallization and other fields, and can be used as an alternative technology for reverse osmosis technology. Membrane distillation technology has attracted more and more attention due to its advantages such as low operating pressure, high salt...

AI Technical Summary

Problems solved by technology

[0003] However, on the one hand, the traditional membrane distillation process needs to heat all the circulating water on the feed liquid side, which requires a large heating energy consumption; on the other hand, the traditional membrane distillation process needs to maintain a certain flow rate of the feed liquid side to alleviate the temperature polarization , to ensure the efficiency and water production of membrane distillation, it requires a large energy consumption of hydraulic cycle

As a result, the membrane distillation operation consumes a lot of energy

[0004] In addition, the existing membrane distillation process still has the problem of membrane wetting. The wetting of the membrane will cause the membrane distillation process to fail. After the membrane is wet, it must be cleaned and dried before the membrane distillation process can be restarted.

Since the membrane is packed in the module, the drying process after cleaning is not easy to carry out

Images