Permeation chip for enhanced concentration by capillary pressure difference

Abstract

The invention discloses a permeation chip for enhanced concentration of capillary pressure difference. An upper substrate is provided with an upper micro-channel, and the bottom of the upper substrate is provided with a circular upward concave channel communicated with the upper micro-channel; a lower substrate is provided with a lower micro-channel, and the top of the lower substrate is provided with a circular downward concave channel communicated with the lower micro-channel; a circular permeable membrane is arranged between the circular downward concave channels of the upper substrate and the lower substrate, the sections of the upper micro-channel and the lower micro-channel are rectangular, and the sectional area of the upper micro-channel is larger than that of the lower micro-channel. The capillary acting force difference formed by the sectional area difference of the upper micro-channel and the lower micro-channel is utilized, so that the directional transmembrane pressure difference perpendicular to the permeable membrane is generated in the chip, and an additional driving force except a drawing potential is provided. The advantages of low energy consumption, strong interception effect, high water flux, small membrane pollution, stable structure and the like are exerted, the overall transmembrane pressure is improved, the weakening effect of concentration polarization on the permeation process is slowed down, the concentration time is shortened, and the concentration rate is improved.

Description

technical field [0001] The invention relates to a capillary pressure difference enhanced concentration permeation chip, which belongs to the technical field of water treatment detection. Background technique [0002] Osmosis (FO) is a new type of membrane separation technology developed in recent years with the osmotic pressure of the draw solution as the driving force. The FO process is driven by the osmotic pressure difference on both sides of the selective separation membrane, and the water molecules in the solution are transferred from the high water chemical potential area (feed liquid side) to the low water chemical potential area (drawing liquid side) through the selective separation membrane. , and a membrane separation process in which solute molecules or ions are blocked. Osmosis technology has the advantages of low energy consumption, strong interception effect, high water flux, less membrane fouling, stable structure, and wide range of adaptability to temperatur...

AI Technical Summary

Problems solved by technology

Osmosis technology has the advantages of low energy consumption, strong interception effect, high water flux, less membrane fouling, stable structure, and wide range of adaptability to temperature and pH, but the existence of concentration polarization greatly prolongs the time-consuming process of osmosis. , while reducing the concentration efficiency

At present, there are no reports on the application of microfluidic chip technology in osmotic systems

Images