Confined-range conductive composite film, preparation method thereof and electrochemical method for in-situ hydrolysis of extracellular polymeric substance based on confined-range conductive composite film

By using a confined conductive composite membrane in a membrane bioreactor, carbon nanotubes modified with a nano-metal catalyst are used to generate an alkaline microenvironment through hydrogen evolution reaction under low voltage, which in-situ hydrolyzes EPS, thus solving the problem of EPS pollution in the membrane bioreactor and achieving a highly efficient and environmentally friendly membrane cleaning effect.

CN121944816AActive Publication Date: 2026-05-01POWERCHINA HUADONG ENG CORP LTD
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Patent Information

Application Number
CN202610433829.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-03
Publication Date
2026-05-01
Estimated Expiration
2046-04-03

AI Technical Summary

Technical Problem

Existing technologies are insufficient for efficiently removing extracellular polymeric substances (EPS) contamination from microorganisms in membrane bioreactors, and traditional cleaning methods suffer from low efficiency, significant environmental impact, and high costs.

Method used

A confined conductive composite membrane is used, which consists of an ultrafiltration membrane carrier and a conductive layer. The conductive layer is composed of carbon nanotubes modified with nano-metal catalysts. An alkaline microenvironment is generated through hydrogen evolution reaction under low voltage, which hydrolyzes EPS in situ.

Benefits of technology

It achieves efficient hydrolytic degradation of EPS, increases membrane flux, reduces energy consumption and environmental impact, and combines stability and selectivity.

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Abstract

The invention provides a confinement conductive composite membrane, a preparation method thereof and an electrochemical method for in-situ hydrolysis of extracellular polymeric substances based on the confinement conductive composite membrane, and relates to the technical field of sewage treatment. The confinement conductive composite membrane comprises an ultrafiltration membrane carrier and a conductive layer formed on the surface of the ultrafiltration membrane carrier, the conductive layer is made of a carbon nano tube material, and at least one of nano Ni, Co, Fe and Mo catalysts is selectively loaded on the inner wall of a hollow tube or between two-dimensional layers of the carbon nano tube material. The structure effectively prevents agglomeration and loss of the catalyst through a confinement effect, and the dispersity and stability of the catalyst are improved; meanwhile, a continuous conductive network formed by the carbon nanotubes has excellent electron transmission capability, and electrons can be quickly transmitted to catalytic active sites. When the composite membrane is used as a cathode to work, the loaded nano-metal catalyst can remarkably reduce the overpotential of hydrogen evolution reaction, an interface can be induced to construct an alkaline microenvironment in situ under low voltage, and EPS attached to the surface of the membrane is promoted to be hydrolyzed and degraded.
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