Membrane pollution in-situ monitoring device based on Zeta potential and electrical impedance spectroscopy technology

Abstract

The invention discloses a membrane pollution in-situ monitoring device and method based on the Zeta potential and electrical impedance spectroscopy technology. The device comprises a top-free one-wallfiltering pond 1, a membrane fiber 2 is arranged in the middle of the filtering pond 1, and a first Ag / AgCl electrode 3 and a second Ag / AgCl electrode 4 are arranged on a feeding side and a water outlet side of the filtering pond 1 respectively; the first Ag / AgCl electrode 3 and the second Ag / AgCl electrode 4 are connected to a data collecting card 11 through wires, and recording of the flowing potential is achieved through a computer 13; a linear platinum electrode 5 is arranged in a pipeline in the middle of the filtering pond 1, an annular tantalum electrode 6 surrounds the outside the membrane fiber 2, and the linear platinum electrode 5 and the annular tantalum electrode 6 are connected with an electrochemical workstation 10 through wires; signals are transmitted through the computer13; the cross-membrane pressure difference of the membrane fiber 2 is recorded through a pressure sensor 7, and the data is recorded on a paper-free recorder 9. According to the device, the in-situ online membrane pollution stage evaluation can be achieved, the cleaning time is determined, the operation is simple, the sensitivity is high, and industrialization is easy.

Description

technical field [0001] The invention relates to an in-situ monitoring device for membrane pollution based on Zeta potential and electrical impedance map technology, belonging to the field of membrane water treatment. technical background [0002] Hollow fiber membrane ultrafiltration technology has been widely used in the field of water treatment since the technology was developed due to its advantages of high separation efficiency, self-assembly, simple structure design and no secondary pollution. [0003] However, the problem of membrane fouling has always been the main limiting factor restricting the large-scale application of hollow fiber membranes. Membrane fouling will lead to a series of problems such as reduced water flux and water quality, increased costs, and increased instability during operation. Therefore, the problem of membrane fouling has been widely concerned by the scientific and engineering communities. Through in-depth exploration of the membrane fouling ...

AI Technical Summary

Problems solved by technology

[0003] However, the problem of membrane fouling has always been the main limiting factor restricting the large-scale application of hollow fiber membranes. Membrane fouling will lead to a series of problems such as reduced water flux and water quality, increased costs, and increased instability during operation.

However, the membrane fouling can only be observed macroscopically through the transmembrane pressure difference and flux attenuation. Some offline methods cannot be applied on a large scale due to their complex operation and easy damage to the membrane structure, and real-time online monitoring cannot be realized.

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