Flow direction distributing device and drawing method for forward osmosis draw solution

Abstract

The invention provides a flow direction distributing device and a drawing method for a forward osmosis draw solution. The distributing device is provided with an FO membrane element; a high-concentration forward osmosis draw solution enters from the left end of the FO membrane element, and is treated by the FO membrane element and a low-concentration draw solution is outputted from the right end of the FO membrane element; the FO membrane element comprises central tube assemblies and FO membranes sheathed on the outer wall of the central tube assemblies; the central tube assemblies comprise aleft central tube assembly and a right central tube assembly; the left central tube assembly and the right central tube assembly are connected by a Y-shaped diversion pipe and are bothrespectively provided with inner tubes and outer tubes which are concentrically arranged; the outer tubes are provided with water collecting holes; the inner tube of left central tube assembly is connected with the outer tube of the right central tube assembly by the Y-shaped diversion pipe; in addition, the right end of the inner tube of the right central tube assembly is connected with the FO membrane on the right side by a pipeline.

Description

technical field [0001] The invention relates to water body purification, in particular to a forward osmosis drawing liquid flow direction distribution device and a drawing method. Background technique [0002] At present, as the country pays more and more attention to environmental pollution, most of the application of forward osmosis draw solution technology is still in the laboratory research stage in the zero-discharge treatment of high-concentration wastewater, and there is still a certain distance from the real industrial application. The lack of high-performance forward osmosis membrane and high osmotic pressure and easy recovery of draw solution are the main obstacles limiting its industrial application. In order to realize zero-discharge treatment of sewage today, domestic research on forward osmosis draw liquid flow distribution technology started relatively late, and there is still a large gap in technical problems. [0003] Conventional forward osmosis draw liqui...

AI Technical Summary

Problems solved by technology

[0004] 1. When dealing with high-concentration water, it is easy to appear compact pollution layer

[0005] 2. When the concentration of the raw water is constant, the concentration of the drawing solution is likely to increase, and the osmotic pressure difference is unstable

[0006] 3. After many times of recovery, it is easy to affect the osmotic flux of the draw solution and the membrane problem

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