An osmotic chip with enhanced concentration by capillary pressure difference

Abstract

The invention discloses a permeation chip enhanced and concentrated by capillary pressure difference. An upper substrate is provided with an upper microchannel, a circular upward concave channel communicated with the upper microchannel is arranged at the bottom of the upper substrate; The microchannel is provided with a circular downward groove that communicates with the lower microchannel on the top of the lower substrate; the circular permeable membrane is arranged between the circular downward grooves of the upper and lower substrates, and the upper and lower microchannels have a circular downward groove. The cross-section is rectangular, and the cross-sectional area of ​​the upper microchannel is larger than the cross-sectional area of ​​the lower microchannel. The invention utilizes the capillary force difference formed by the difference in the cross-sectional area of ​​the upper and lower microchannels to generate a directional transmembrane pressure difference perpendicular to the permeable membrane in the chip, providing an additional driving force other than the draw potential. The advantages of low energy consumption, strong interception effect, high water flux, small membrane fouling, and stable structure are brought into play, and the overall transmembrane pressure is increased, the weakening effect of concentration polarization on the permeation process is slowed down, and the concentration time is shortened. Increased concentration ratio.

Description

technical field [0001] The invention relates to an osmotic chip with enhanced concentration by capillary pressure difference, and 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 that draws liquid osmotic pressure 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 , a membrane separation process in which solute molecules or ions are blocked. Permeation technology has the advantages of low energy consumption, strong interception effect, high water flux, small membrane fouling, stable structure, and wide adaptability to temperature and pH. However,...

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

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