CN-122006489-A - Membrane cleaning agent for removing microbial pollution and preparation method and application thereof

CN122006489ACN 122006489 ACN122006489 ACN 122006489ACN-122006489-A

Abstract

The invention belongs to the technical field of membrane cleaning agents, and particularly relates to a membrane cleaning agent for removing microbial contamination, and a preparation method and application thereof. The film cleaning agent comprises a stripping agent, a non-oxidizing bactericide, biological enzyme, an enzyme stabilizer, a sterilization synergist and water, wherein the stripping agent is an epoxy alkyl compound, the enzyme stabilizer is glycerol and/or propylene glycol, and the sterilization synergist is trimethoprim and/or trimethoprim. The key point of the invention is that the stripping agent, the non-oxidizing bactericide, the biological enzyme, the enzyme stabilizer and the sterilization synergist are used as main components, the cleaning effect is synergistically improved from the two aspects of enhancing the stripping elution effect and the sterilization effect of the cleaning agent, and the microbial contamination on the membrane is efficiently removed, so that the membrane flux is greatly improved compared with that before the cleaning, and the desalination performance is basically the same as that before the cleaning.

Inventors

CAO SHENGXIN
ZOU TONG
SU FENGYING
LIN DONGYONG
HU GENFU
Shao Lanyan
JIANG LINYU
DONG ZHENGJUN
WANG RUSHUN

Assignees

嘉戎盛泓(营口)生态环保有限公司
厦门嘉戎技术股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. A membrane cleaning agent for removing microbial contamination is characterized by comprising a stripping agent, a non-oxidizing bactericide, biological enzyme, an enzyme stabilizer, a sterilization synergist and water, wherein the stripping agent is an epoxy alkyl compound, the enzyme stabilizer is glycerol and/or propylene glycol, and the sterilization synergist is trimethoprim and/or trimethoprim.
2. The membrane cleaning agent for removing microbial contamination according to claim 1, wherein the content of the stripping agent is 2.0 to 4.0wt%, the content of the non-oxidizing bactericide is 3.0 to 6.0wt%, the content of the biological enzyme is 2.0 to 5.0wt%, the content of the enzyme stabilizer is 0.5 to 1.5wt%, the content of the sterilization synergist is 1.0 to 3.0wt%, and the balance is water, based on 100.0wt% of the total mass of the membrane cleaning agent.
3. The membrane cleaner for removing microbial contamination according to claim 1, wherein the stripping agent is at least one selected from the group consisting of 1, 2-butylene oxide, 2, 3-butylene oxide, 1, 2-pentane oxide, 2, 3-pentane oxide, 1, 2-hexane oxide, 1, 2-heptane oxide.
4. The membrane cleaning agent for removing microbial contamination according to claim 1, wherein the non-oxidizing bactericide is at least one selected from isothiazolinone, dithiocyano methane, benzalkonium bromide, benzalkonium chloride.
5. The membrane cleaner for removing microbial contamination according to claim 1, wherein the biological enzyme is selected from at least one of lysozyme, pectinase, lipase, protease, glucanase, chitinase, amylase, cellulase.
6. The membrane cleaning agent for removing microbial contamination according to claim 5, wherein the biological enzyme is a complex enzyme comprising lysozyme, pectase, lipase and protease, wherein the mass ratio of the lysozyme, pectase, lipase and protease is 1 (1-3): 0.5-2.
7. The method for preparing the membrane cleaning agent for removing microbial contamination according to any one of claims 1 to 6, wherein the preparation method is characterized in that a stripping agent, a non-oxidizing bactericide, biological enzymes, an enzyme stabilizer and a sterilization synergist are mixed and dissolved with water, and the obtained mixed solution is the membrane cleaning agent.
8. The method for preparing the membrane cleaning agent for removing microbial contamination according to claim 7, wherein the mixing process of the raw material components in the preparation method comprises the steps of firstly carrying out a first stirring treatment on a stripping agent, an enzyme stabilizer, a sterilization synergist and water until the stripping agent, the enzyme stabilizer, the sterilization synergist and the water are completely dissolved, then adding a non-oxidizing bactericide and biological enzyme for a second stirring treatment, and obtaining a mixed solution which is the membrane cleaning agent; Preferably, the rotating speed of the first stirring treatment is 60-80 r/min, and the time is 0.5-1.5 h; preferably, the rotation speed of the second stirring treatment is 20-40 r/min, and the time is 1.0-3.0 h.
9. The use of the membrane cleaning agent for removing microbial contamination according to any one of claims 1 to 8 in a membrane cleaning process.
10. The method for cleaning a membrane according to claim 9, wherein the membrane cleaning method comprises the steps of preparing a working solution from the membrane cleaning agent according to any one of claims 1 to 8, then conveying the working solution into a container for placing a membrane to be cleaned, circularly cleaning at a low flow rate in the first stage, circularly cleaning at a high flow rate in the second stage, soaking and circularly cleaning at 30-50 ℃ at a low flow rate in the third stage, and flushing the working solution with clear water after discharging the working solution; Preferably, the concentration of the film cleaning agent in the working solution is 1-10%; preferably, the operation pressure of the first stage is 5-7 bar, the membrane surface flow rate is 0.8-1.2 m/s, and the time is 5-15 min; Preferably, the operating pressure of the second stage is 8-12 bar, the membrane surface flow rate is 1.8-2.2 m/s, and the time is 30-50 min; Preferably, the operating pressure of the third stage is 5-7 bar, the membrane surface flow rate is 0.8-1.2 m/s, and the time is 2.0-4.0 h.

Description

Membrane cleaning agent for removing microbial pollution and preparation method and application thereof Technical Field The invention belongs to the technical field of membrane cleaning agents, and particularly relates to a membrane cleaning agent for removing microbial contamination, and a preparation method and application thereof. Background With the wide application of various membrane separation technologies (such as nanofiltration membrane, ultrafiltration membrane, reverse osmosis membrane and the like) and devices in the fields of water treatment such as drinking water advanced treatment, sewage reuse and the like, the problem of membrane pollution gradually becomes a key bottleneck restricting performance exertion and economic benefits of the membrane pollution, and the membrane pollution is valued. Membrane contamination includes inorganic contamination, organic contamination, and microbial contamination. Microbial contamination is considered to be the most complex, difficult to control type of contamination, and cleaning is also extremely difficult, due to its particular formation mechanism and difficulty of management, as compared to the other two types of contamination. Microorganisms including algae, bacteria, fungi, spores, viruses and the like, in the process of forming microbial contamination, macromolecular substances such as organic matters (humus, polysaccharide ester) and the like in water are firstly adsorbed on the surface of the membrane to become a condition for survival of the microorganisms, and then the microorganisms can rapidly propagate on the membrane to form microbial contamination. Biological slime formed by microbial contamination is insoluble in acid and alkali, is hardly affected by water flow shearing force, and is hardly washed away even if repeatedly washed. After the microbial contamination is formed, the water yield can be greatly reduced, the operating pressure is rapidly increased, the energy consumption is increased, and the normal production on site is affected. Currently, the industry commonly uses strong acid or alkali solutions for cleaning. The strong acid solution has good treatment effect on inorganic pollution, but has poor treatment effect on organic pollution or microbial pollution, and the strong alkali solution with high concentration is generally needed to have effect on removing microbial pollution, but the strong alkali with high concentration has great influence on the damage of the self structure of the membrane, thereby reducing the interception and filtration performance of the membrane. The membrane is cleaned by adding an oxidative disinfectant or bactericide, but the risk of membrane oxidative damage exists, and the bactericide mainly acts on suspended microorganisms, has poor penetrability on the formed mature biological membrane and has limited cleaning effect. In recent years, enzyme catalytic cleaning technology gradually becomes a research hot spot, and the enzyme has the remarkable advantages of high efficiency, specificity, mildness and the like as a biocatalyst, and can specifically hydrolyze key components in the biological film, so that the biological film can be effectively disintegrated and removed. For example, patent document CN105169953a reports an enzymatic cleaner for cleaning microbial contamination of reverse osmosis membrane, which mainly removes microbial contamination by the action of biological enzymes, but the cleaning effect achieved by the action of biological enzymes alone is poor, and the enzyme stabilizer in the formulation is sucrose, which can also be a carbon source necessary for the survival and propagation of microorganisms, possibly further aggravating microbial contamination. Therefore, it is necessary to develop a membrane cleaning agent capable of safely and efficiently removing microbial contamination, and reducing damage to the structure of the membrane itself during cleaning, so as to ensure that the membrane after cleaning still maintains efficient desalination performance. Disclosure of Invention The invention aims at solving the problem of poor cleaning effect of the existing membrane cleaning agent, and provides a safe and efficient membrane cleaning agent which can not only efficiently remove microbial contamination on a membrane and greatly improve the membrane flux, but also ensure that the cleaned membrane continuously maintains high-efficiency desalination performance. The membrane cleaning agent comprises a stripping agent, a non-oxidizing bactericide, biological enzymes, an enzyme stabilizer, a sterilization synergist and water, wherein the stripping agent is an epoxy alkyl compound, the enzyme stabilizer is glycerol and/or propylene glycol, and the sterilization synergist is trimethoprim and/or trimethoprim. In a preferred embodiment, the total mass of the film cleaning agent is 100.0wt%, the content of the stripping agent is 2.0-4.0 wt%, the content of the non-oxidizing bactericide is 3.0