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A device for testing the performance of forward osmosis membranes

A forward osmosis membrane and testing device technology, applied in the fields of seawater desalination and water and wastewater treatment, can solve problems such as low water flux, and achieve the effects of accurate test results, easy disassembly, and easy operation.

Active Publication Date: 2015-09-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the actual situation is that although the FO membrane separation process does not require external pressure and the membrane fouling tendency is small, the serious concentration polarization phenomenon and reverse salt osmosis lead to low water flux.

Method used

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  • A device for testing the performance of forward osmosis membranes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The FO membrane used for the test is made of acetate fiber, and the effective membrane area is 0.015m 2 , the feed liquid is clear water, the flow velocity is 0.13m / s, the draw liquid is 1.5M sodium chloride solution, the flow velocity is 0.15m / s, and the aeration rate of the feed liquid pool 8 is 0.2m 3 / h. Under the operating condition of 20°C, the changes of the membrane flux were investigated under two modes, that is, the active layer faces the draw liquid (PRO mode) and the active layer faces the feed liquid (FO mode). When the two modes were operated stably for 8 hours respectively, the average membrane flux in PRO mode was 9.64L / (m 2 h), the average membrane flux in FO mode is 8.39L / (m 2 h). The membrane flux of PRO mode is higher than that of FO mode, because the concentration polarization generated when the active layer faces the draw liquid (PRO mode) is smaller than that generated when the active layer faces the feed liquid (FO mode) , the membrane flux i...

Embodiment 2

[0023] The FO membrane used for the test is made of acetate fiber, and the effective membrane area is 0.015m 2 , the feed liquid is activated sludge, the initial sludge concentration is 4.08g / L, the flow velocity is 0.13m / s, the draw liquid is 1.5M sodium chloride solution, the flow velocity is 0.15m / s, and the active layer faces the feed liquid (i.e. FO mode), the initial flux is 13L / (m 2 h), the SRT is 10d, and the aeration rate of the feed liquid tank 8 is 0.2m 3 / h. Under the operating condition of 25°C, the system was operated stably for 33 days, and the change of membrane flux and membrane fouling were investigated. With the change of time, the water flux changes from 13L / (m 2 h) down to 2L / (m 2 h). The water flux decreased rapidly within 100 hours, and then decreased slowly. After 300 hours, the membrane flux tended to be stable, and fouling on the surface of the membrane could be clearly observed. Due to the increase in the concentration of dissolved substances t...

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Abstract

The invention discloses a device for evaluating performance of a forward osmosis membrane. The device comprises a raw material liquid tank, a feed liquid pool, a forward osmosis membrane component, a draw solution pool, a high-concentration salt pond and a delivery tank, wherein a check valve and an overflow pipe are arranged on an overflow tank of the pool; an aeration pipe is arranged at the bottom; the forward osmosis membrane component comprises a shell; a forward osmosis membrane is arranged inside the shell, and divides the shell into upper and lower lattices, which respectively are a draw solution chamber and a feed liquid chamber; the draw solution chamber is put into a magnetic stirrer; a water inlet / outlet of the draw solution pool is connected with the draw solution chamber of the forward osmosis membrane component; a probe of a conductivity controller is put into the pool; the water outlet of the high-concentration salt pond is connected with the water inlet of the draw solution pool through a pipeline with a strong brine pump; opening and closing of the strong brine pump are controlled by a conductivity meter; the delivery tank is put on an electric scale. The device disclosed by the invention is small in volume, simple and easy to operate, stable in test result, small in required area of the forward osmosis membrane, wide in application range, and applicable to test of the forward osmosis membranes with kinds of sources.

Description

technical field [0001] The invention relates to a device for evaluating the performance of forward osmosis membranes for different purposes, and belongs to the fields of seawater desalination and water and waste water treatment. Background technique [0002] Forward Osmosis (FO) is an emerging membrane separation technology. It uses the osmotic pressure difference of the solution on both sides of the FO membrane to obtain clean effluent without external pressure. FO membrane separation technology has the advantages of high rejection rate, low energy consumption, and low membrane fouling. It has been used in seawater desalination, wastewater treatment and purification, food processing, pharmaceutical industry, and power generation. An ideal FO membrane should have the following characteristics: (1) high salt rejection rate; (2) high water flux; (3) low concentration polarization; (4) good mechanical strength. As the core unit of the forward osmosis separation process, the F...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/10
Inventor 王新华袁博李秀芬陈瑶任月萍
Owner JIANGNAN UNIV
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