Disc tube type vacuum multi-effect membrane distillation assembly and system

Abstract

The invention belongs to the technical field of membrane distillation, and particularly relates to a disc tube type vacuum multi-effect membrane distillation assembly and system. A disc tube type vacuum multi-effect membrane distillation assembly comprises a disc tube type component, and a membrane on a disc type membrane in the disc tube type component is a pervaporation membrane or a distillation membrane. The disc tube type component comprises a shell, an upper flange plate and a lower flange plate are arranged at the two ends of the shell respectively, the upper flange plate and the lower flange plate are fixed through a center pull rod, and a flow guide plate and a disc type membrane are arranged in the shell. A to-be-treated material inlet, a concentrate outlet and a purified water outlet are formed in the upper flange plate or the lower flange plate. According to the invention, the disc tube type reverse osmosis assembly and the membrane distillation technology are coupled to construct the novel membrane distillation assembly, so that the problems of low membrane distillation flux and membrane pollution in the prior art are solved; a vacuum membrane distillation form is adopted, so that certain flux can be improved, and pollution of high-salinity wastewater to a membrane distillation membrane is relieved.

Description

technical field [0001] The invention belongs to the technical field of membrane distillation, and in particular relates to a disc-tube vacuum multi-effect membrane distillation component and system. Background technique [0002] Membrane distillation technology, as an emerging water treatment technology, was first used in seawater desalination. In recent years, it has gradually shown broad application prospects in the field of industrial high-salt wastewater treatment. This technology relies on the vapor pressure difference generated by the temperature difference for mass transfer. Since the vapor pressure is less affected by the salt concentration, membrane distillation can generally concentrate the saline wastewater to 20%. Compared with pressure-driven membrane separation technology such as reverse osmosis technology, membrane distillation has low operating pressure, good water quality and less membrane pollution. In addition, membrane distillation operates at a lower te...

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Problems solved by technology

However, the operating conditions of this technology are harsh, and the operating pressure generally needs to be above 90bar. The membrane shell needs to be able to bear the pressure of 90-120bar. Pumps, etc. need to be resistant to high pressure and corrosion, so the system has special materials, complex structures, high equipment investment costs and high operating costs

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