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Nano-silver composite treating agent for improving anti-pollution capacity of MBR membrane and application of nano-silver composite treating agent

A composite treatment, nano-silver technology, applied in the direction of biological water/sewage treatment, water/sludge/sewage treatment, sustainable biological treatment, etc., to achieve the effect of prolonging the interval time, strong adhesion, and good physical and chemical stability

Pending Publication Date: 2021-12-31
KESHENG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nano-silver composite treatment agent can significantly improve the hydrophilicity and antibacterial properties of the surface of the MBR membrane, and effectively solve or alleviate the problem of MBR membrane pollution caused by the adsorption of hydrophobic organic matter and biofilm on the surface of the MBR membrane.

Method used

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  • Nano-silver composite treating agent for improving anti-pollution capacity of MBR membrane and application of nano-silver composite treating agent
  • Nano-silver composite treating agent for improving anti-pollution capacity of MBR membrane and application of nano-silver composite treating agent
  • Nano-silver composite treating agent for improving anti-pollution capacity of MBR membrane and application of nano-silver composite treating agent

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Experimental program
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Effect test

Embodiment 1

[0049] The nano-silver composite treatment agent provided by the invention includes a nano-silver material and a hydrophilic polymer. The mass ratio of the nano-silver material and the hydrophilic polymer in the treatment agent is 1:15.

[0050] The particle size of the nano-silver material in the nano-silver composite treatment agent is 10-60 nm. The raw materials for the preparation of nano-silver materials are AgNO3 (99%+), L-AA (99%+, reducing agent), PVP (polyvinylpyrrolidone, MW≈55000), ultrapure water, and absolute ethanol (analytical pure). The preparation process of nano-silver material is as follows:

[0051] 1) Add 10mL ultrapure water into a 15mL centrifuge tube, then add 0.25mL AgNO3 solution with a concentration of 10mmol / L, 0.5mL PVP solution with a concentration of 10mmol / L and 0.5mL L-AA with a concentration of 100mmol / L Reagent;

[0052] 2) Cover and tighten the cap of the centrifuge tube, and use an external vibrating mixer to mix and stir for 3 minutes, ...

Embodiment 2

[0075] As another preferred embodiment of the present invention, the difference from Example 1 is that the mass ratio of the nano-silver material and the hydrophilic polymer in the nano-silver composite treatment agent is 1:20, and all the other implementation conditions are the same as in Example 1. in the same.

Embodiment 3

[0077] As another preferred embodiment of the present invention, the difference from embodiment 1 is that the average thickness of the coating finally formed by spraying the nano-silver composite treatment agent is 0.12mm, and the rest of the implementation conditions are the same as in embodiment 1.

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Abstract

The invention discloses a nano-silver composite treating agent for improving the anti-pollution capacity of an MBR membrane and application, and relates to the technical field of sewage treatment. The nano-silver composite treating agent comprises a nano-silver material and a hydrophilic polymer, and a hydrophilic and antibacterial layer is formed on the surface of the MBR membrane by spraying the nano-silver composite treating agent on the surface of the MBR membrane. Adsorption and accumulation of hydrophobic organic pollutants on the surface of the MBR membrane and growth and enrichment of a biological membrane on the surface of the MBR membrane can be remarkably reduced; therefore, the anti-pollution capacity of the MBR membrane is improved, the permeability of the MBR membrane is kept, the interval time of backwashing and chemical cleaning of the MBR membrane is greatly prolonged, and the service life of the MBR membrane is prolonged. The nano-silver composite treating agent has the advantages of being good in physical and chemical stability, high in abrasion resistance and high in binding power. The mechanical strength and permeability of the product are not easy to reduce even after long-term operation and chemical cleaning agent treatment, and the product is not easy to peel off from the surface of the MBR membrane under the action of water flow and bubble shearing force.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a nano-silver composite treatment agent for improving the anti-pollution ability of MBR membranes and its application. Background technique [0002] The MBR process is a sewage treatment process that combines activated sludge process and membrane separation. It is currently widely used in the fields of municipal sewage treatment and industrial wastewater treatment in my country. Compared with the traditional secondary sedimentation tank mud-water separation process, the MBR process has the characteristics of high mud-water separation efficiency and high operation stability. The use of MBR membranes for mud-water separation can effectively solve the problem of activated sludge loss caused by activated sludge expansion in the secondary settling tank process. At the same time, compared with the traditional biochemical tank, the MBR membrane tank has a higher co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/02B01D67/00C02F3/12
CPCB01D71/68B01D69/02B01D67/0002C02F3/1268B01D2325/36B01D2325/48Y02W10/10
Inventor 孙信柏刘爱宝董畔夏万成王凯朱辉
Owner KESHENG ENVIRONMENTAL PROTECTION TECH CO LTD
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