Electrochemical method and monitoring device for in-situ monitoring of membrane surface fouling status

An electrochemical and membrane surface technology, applied in the direction of measuring devices, electrochemical variables of materials, scientific instruments, etc., can solve the problems of increased power consumption, reduced membrane performance such as flux and conductivity, shortened membrane life, and economic feasibility. Achieve the effect of precise device and simple operation

Inactive Publication Date: 2020-01-14
TIANJIN CHENGJIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Membrane fouling will lead to a decrease in membrane performance such as flux and conductivity, and the increase in power consumption and shortened membrane life due to membrane fouling have become the main problems that limit the application and economic feasibility of membrane devices.
[0003] Membrane fouling has been reported in many literatures, most of which focus on the characterization of the physical properties of the membrane and the characteristics of the membrane material itself, and cannot monitor the membrane fouling status in real time

Method used

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  • Electrochemical method and monitoring device for in-situ monitoring of membrane surface fouling status
  • Electrochemical method and monitoring device for in-situ monitoring of membrane surface fouling status
  • Electrochemical method and monitoring device for in-situ monitoring of membrane surface fouling status

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Effect test

specific Embodiment 1

[0048] Sodium alginate (Sodium alginate, SA) was selected as a typical pollutant in the research of membrane fouling, and AEM-Type I—0.5mol / L NaCl+0.5%SA solution system was used. Put the ion exchange membrane to be tested into the four-electrode system test device, and then connect the four-electrode system test device with the electrochemical workstation and two gear pumps. Pour the prepared solution with a concentration of 0.5mol / LNaCl+0.5% SA into the liquid storage tank, place the liquid storage tank in a constant temperature bath, and set the temperature at 20°C. Start the gear pump and adjust the flow rate of the gear pump so that the flow rate is 2 cm / s. After the flow rate and potential difference were stabilized, the impedance spectrum was obtained by the electrochemical impedance spectroscopy method of the electrochemical workstation. Use AEM-TypeII-0.5mol / L NaCl+0.5%SA solution system, and then change the flow rate of the gear pump to 2, 3, 4cm / s to carry out the ...

specific Embodiment 2

[0051] Sodium alginate (Sodium alginate, SA) was selected as a typical pollutant in the research of membrane fouling, and AEM-TypeII-0.1mol / L NaCl+0.5%SA solution system was used. Put the ion exchange membrane to be tested into the four-electrode system test device, and then connect the four-electrode system test device with the electrochemical workstation and two gear pumps. Pour the prepared NaCl solution with a concentration of 0.1 mol / L into the liquid storage tank, place the liquid storage tank in a constant temperature bath, and set the temperature at 20°C. Start the gear pump and adjust the flow rate of the gear pump so that the flow rate is 1 cm / s. After the flow rate and potential difference were stabilized, the impedance spectrum was obtained by the electrochemical impedance spectroscopy method of the electrochemical workstation. Then change the concentration of electrolyte (NaCl) solution to 0.3mol / L and 0.5mol / L to carry out the same measurement to investigate the...

specific Embodiment 3

[0054] Sodium alginate (Sodium alginate, SA) was selected as a typical pollutant in the research of membrane fouling, and AEM-TypeII-0.1mol / L NaCl+0.5%SA solution system was used. Put the ion exchange membrane to be tested into the four-electrode system test device, and then connect the four-electrode system test device with the electrochemical workstation and two gear pumps. Pour the prepared NaCl solution with a concentration of 0.1 mol / L into the liquid storage tank, place the liquid storage tank in a constant temperature bath, and set the temperature at 20°C. Start the gear pump and adjust the flow rate of the gear pump so that the flow rate is 1 cm / s. After the flow rate and potential difference were stabilized, the impedance spectrum was obtained by the electrochemical impedance spectroscopy method of the electrochemical workstation. Then the pollutant SA was replaced by bovine serum albumin BSA for the same determination to investigate the effect of different pollutant...

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Abstract

The invention relates to an electrochemical method for in-situ monitoring of the membrane surface fouling status. A testing system comprises a four-electrode system monitoring device, an electrochemical workstation, a temperature-controlled water bath, and a gear pump. The method comprises the following steps: a membrane to be detected is placed in the four-electrode system device to achieve contact between the membrane surface and an electrolyte solution, so that a series circuit is formed; current or voltage signals obtained through electrochemical impedance spectroscopy are reflected in software of the electrochemical workstation to form an impedance or admittance spectrum; an equivalent circuit model is then selected for nonlinear least square fitting and analysis of the impedance or admittance spectrum; and after electrochemical information of the system is obtained, fitting is carried out to obtain electrochemical parameter values of a fouling layer and a membrane-solution interface layer during fouling of the detected membrane. The method provided by the invention has the beneficial effects of high accuracy, high simplicity and high practicality; the membrane measurement isnondestructive; the testing precision can be improved, and errors caused by membrane nonuniformity can be reduced; and changes in electrochemical properties of the membrane and an interface of the membrane during the membrane fouling can be effectively represented.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to an electrochemical method and a monitoring device for in-situ monitoring of membrane surface pollution. Background technique [0002] Membrane separation technology has been widely used in sewage treatment, seawater desalination, medicine, food processing, medical treatment, chemical industry, bionics and other fields due to its high efficiency, energy saving, environmental protection, and easy control. However, membrane fouling is one of the main reasons restricting the application of membrane technology. Membrane fouling is the process in which pollutants are deposited on the surface of the membrane. Pollutants in the water body can adhere to the surface of the membrane and / or enter the interior of the membrane through electrostatic force and chemical adsorption, and form a pollution layer on the surface of the membrane. Membrane fouling will lead to the reduction of membran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/04G01N27/22
CPCG01N27/26G01N27/041G01N27/22
Inventor 张文娟撖博王执伟常晶王雨菲王少坡张宇峰马军
Owner TIANJIN CHENGJIAN UNIV
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