Method and apparatus for detecting membrane damage based on electrochemistry and magnetic bead technology

Abstract

The invention discloses a method and an apparatus for detecting membrane damage based on an electrochemistry and magnetic bead technology. According to the apparatus and the method, a horizontal segment at the exactly middle of a clear-liquid outlet pipe is provided with a magnetic-bead detection device tightly connected with the clear-liquid outlet pipe; a positive electrode sheet and a negative electrode sheet are horizontally arranged side by side along the radial direction at the middle part in a magnetic-bead detection pipe and are immersed in a clear liquid; the lower segments of two adjacent but contactless metal electrodes both stretch into the clear liquid in the magnetic-bead detection pipe, and the upper segments both stretch out of the magnetic-bead detection pipe and are both winded by a coil; the tops of the two metal electrodes are both connected with an MCU main control unit via an MCU sampling interface; the resistance R0 of the clear liquid is calculated out according to the voltage and the current; and magnetic beads with the diameter larger than the membrane aperture are added into the original liquid, the voltage between the two metal electrodes is acquired and the resistance R at the current moment is calculated out, the resistance R and the resistance R0 are compared, and the damage degree of a filtration membrane is characterized through variation of the resistance of the clear liquid. The detection sensitivity is high, and the membrane is not destroyed.

Description

technical field [0001] The invention relates to the technical field of detection of filter membrane damage, in particular to a membrane damage detection method and device based on electrochemical and magnetic bead technology. Background technique [0002] Membrane separation technology is required in industries such as biology, chemical industry, nuclear industry, metallurgy, food, beverage, medicine and environmental protection. In the process of membrane separation, the pore size of the membrane will change due to the repeated impact of the liquid, the corrosion of the membrane tube due to the precipitation of organic compounds, and the addition of filter-aided ultrasonic waves, which will cause membrane damage, and these damages are irreversible and irreparable. The removed impurities pass through the membrane and enter the clear liquid, and the extracted clear liquid contains impurities, which affects the filtration performance of the membrane. Therefore, how to timely...

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Problems solved by technology

All of the above methods have their own defects. Although the turbidity detection method can be used for continuous on-line detection, the detection is not sensitive and is limited by the concentration of raw liquid particles and process conditions, so the application range is small.

Although the microbial tracer test method has high sensitivity, the biological medium is destructive, the test time is long, it cannot reflect the integrity of the membrane in time, and it cannot be detected online

The bubble point test method does not depend on the water quality of the stock solution and is easy to operate, but it cannot be detected online. The membrane needs to be removed from the membrane module during measurement.

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