CN115722079A

CN115722079A - Disc type membrane cleaning agent and preparation method thereof

Info

Publication number: CN115722079A
Application number: CN202211519355.2A
Authority: CN
Inventors: 马媛媛; 王淑萍; 魏策; 张如来
Original assignee: Deland Water Technology Co ltd
Current assignee: Deland Water Technology Co ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-03-03

Abstract

The invention provides a disc type membrane cleaning agent and a preparation method thereof, wherein the disc type membrane cleaning agent comprises the following components in parts by mass: 30-45 parts of organic acid, 6-12 parts of sodium chloride, 3-6 parts of complexing agent, 7-15 parts of surfactant, 3.5-4.5 parts of bactericide and 20-30 parts of deionized water, wherein the organic acid has no corrosion effect on the disc-tube membrane assembly, and has stronger stripping and removing effects on scale pollution formed by deposition of oxides and organic matters; the surfactant in the cleaning agent can quickly permeate to effectively remove dirt; the disc-tube membrane cleaning agent disclosed by the invention has a good cleaning effect, and the service life of the membrane is prolonged; has the advantages of simple production process, convenient use, environmental protection and the like.

Description

Disc type membrane cleaning agent and preparation method thereof

Technical Field

The invention relates to the technical field of membrane cleaning agents, in particular to a disc type membrane cleaning agent and a preparation method thereof.

Background

The reverse osmosis membrane separation technology plays an important role in the field of water treatment by virtue of the advantages of low operation cost, small occupied area, good treatment effect and the like. However, in the reverse osmosis membrane separation process, contamination also occurs, resulting in a significant decrease in the yield and salt rejection rate of water treatment. The effective membrane area of the disc reverse osmosis membrane is far higher than that of a flat membrane and a hollow fiber desalination membrane, and the disc reverse osmosis membrane is widely applied to high-concentration wastewater treatment.

The membrane cleaning is a treatment method capable of prolonging the service life of the membrane, and biological fouling of the reverse osmosis membrane is relieved to a certain extent. The membrane cleaning includes chemical cleaning and physical cleaning, and the chemical cleaning is to clean the membrane surface by using chemical agents such as acid, alkali, surfactant and the like in combination with water, but the method can cause irreversible damage to the membrane. Because of the problems of the disk-tube type membrane component, pollutants are difficult to flush out of a membrane shell during membrane cleaning, a dissolving type cleaning agent is needed, the reverse osmosis cleaning agent sold in the market at present is generally an acid cleaning agent and an alkaline cleaning agent which are matched for use, and the cleaning process is complex, so that the invention provides the disk-type membrane cleaning agent and the preparation method thereof.

Disclosure of Invention

In order to solve the problems, the invention provides a disc type membrane cleaning agent and a preparation method thereof, and aims to more exactly solve the problem that the reverse osmosis cleaning agent sold in the market at present is generally an acid cleaning agent and an alkaline cleaning agent which are matched for use, and the cleaning process is complex.

The invention is realized by the following technical scheme:

the invention provides a disc type membrane cleaning agent which comprises the following components in parts by mass: 30-45 parts of organic acid, 6-12 parts of sodium chloride, 3-6 parts of complexing agent, 7-15 parts of surfactant, 3.5-4.5 parts of bactericide and 20-30 parts of deionized water.

Further, the disc-type membrane cleaning agent is characterized in that the organic acid is any one of sulfamic acid, citric acid and oxalic acid or any two of the sulfamic acid, the citric acid and the oxalic acid or any three of the sulfamic acid, the citric acid and the oxalic acid.

Further, the complexing agent of the disc-type membrane cleaning agent is disodium ethylene diamine tetraacetate.

Furthermore, the disc-type membrane cleaning agent is characterized in that the surfactant is a composition of sodium dodecyl benzene sulfonate and octyl phenol polyoxyethylene ether.

Further, the disc-type membrane cleaning agent is characterized in that the bactericide is isothiazolinone.

6. A preparation method of a disc type membrane cleaning agent comprises the following steps:

s1: stirring organic acid, complexing agent, sodium chloride, surfactant and deionized water at 40-50 deg.C for 20-30min;

s2: adding the bactericide when the temperature of the S1 is reduced to 25-30 ℃, and stirring for 10-15min;

further, in the preparation method of the disc-type membrane cleaning agent, the disc-type membrane cleaning agent can be obtained after the S2 is uniformly stirred, and the stirring speed is 200-500rpm.

The invention has the beneficial effects that:

the organic acid in the invention has no corrosion effect on the disc-tube type membrane component, and has stronger stripping and removing effects on scaling pollution formed by deposition of oxides and organic matters; the surfactant in the cleaning agent can quickly permeate to effectively remove dirt; the disc-tube membrane cleaning agent disclosed by the invention has a good cleaning effect, and the service life of the membrane is prolonged; has the advantages of simple production process, convenient use, environmental protection and the like.

Drawings

FIG. 1 is a schematic flow chart of a preparation method of the disc-type membrane cleaning agent of the present invention.

Detailed Description

In order to more clearly and completely describe the technical scheme of the invention, the invention is further described with reference to the accompanying drawings.

Referring to fig. 1, the present invention provides a cleaning agent for a disc-type membrane and a method for preparing the same.

Example 1

A disc type membrane cleaning agent is prepared from the following raw materials in parts by mass: 30 parts of organic acid (10 parts of sulfamic acid, 10 parts of citric acid and 10 parts of oxalic acid), 3 parts of disodium ethylene diamine tetraacetate, 3.5 parts of isothiazolinone, 6 parts of sodium chloride, 7 parts of surfactant (3.5 parts of sodium dodecyl benzene sulfonate and 3.5 parts of octylphenol polyoxyethylene ether) and 30 parts of water;

a preparation method of a disc type membrane cleaning agent comprises the following steps:

further, the S2 is uniformly stirred and cooled to obtain the disc-type membrane cleaning agent, and the stirring speed is 400-600rpm.

Example 2

A disc type membrane cleaning agent is prepared from the following raw materials in parts by mass: 35 parts of organic acid (15 parts of sulfamic acid, 10 parts of citric acid and 10 parts of oxalic acid), 5 parts of disodium ethylene diamine tetraacetate, 4 parts of isothiazolinone, 10 parts of sodium chloride, 10 parts of surfactant (5 parts of sodium dodecyl benzene sulfonate and 5 parts of octylphenol polyoxyethylene ether) and 30 parts of water;

Example 3

A disc type membrane cleaning agent is prepared from the following raw materials in parts by mass: 35 parts of organic acid (10 parts of sulfamic acid, 15 parts of citric acid and 10 parts of oxalic acid), 5 parts of disodium ethylene diamine tetraacetate, 4 parts of isothiazolinone, 10 parts of sodium chloride, 10 parts of surfactant (5 parts of sodium dodecyl benzene sulfonate and 5 parts of octylphenol polyoxyethylene ether) and 30 parts of water;

Example 4

A disc type membrane cleaning agent is prepared from the following raw materials in parts by mass: 35 parts of organic acid (10 parts of sulfamic acid, 15 parts of citric acid and 10 parts of oxalic acid), 5 parts of ethylene diamine tetraacetic acid disodium salt, 4 parts of isothiazolinone, 10 parts of sodium chloride, 15 parts of surfactant (10 parts of sodium dodecyl benzene sulfonate and 5 parts of octylphenol polyoxyethylene ether) and 30 parts of water;

Example 5

A disc type membrane cleaning agent is prepared from the following raw materials in parts by mass: 45 parts of organic acid (15 parts of sulfamic acid, 15 parts of citric acid and 15 parts of oxalic acid), 6 parts of disodium ethylene diamine tetraacetate, 4.5 parts of isothiazolinone, 12 parts of sodium chloride, 15 parts of surfactant (10 parts of sodium dodecyl benzene sulfonate and 5 parts of octylphenol polyoxyethylene ether) and 20 parts of water;

s1: stirring organic acid, complexing agent, sodium chloride, surfactant and deionized water at 40-50 deg.C for 20-30min,

further, the S2 is uniformly stirred and cooled to obtain the disc type membrane cleaning agent, and the stirring speed is 400-600rpm.

The cleaning agent for the disc type membrane prepared in examples 1 to 5 and the reverse osmosis cleaning agent on the market are used as a contrast test for cleaning, the removal rate of colloid, organic matters, microorganisms and sulfate scales before and after cleaning is measured, the greater the removal rate is, the better the cleaning effect of the cleaning agent is, and the experimental results are shown in table 1.

Table 1 cleaning agent performance test results

Group of	Type of soil removal	Removal rate%
			Example 1	Colloids, organics, microorganisms, oxides, and sulfate scale	88
Example 2	Colloids, organics, microorganisms, oxides, and sulfate scale	91
			Example 3	Colloids, organics, microorganisms, oxides, and sulfate scale	93
Example 4	Colloids, organics, microorganisms, oxides, and sulfate scale	95
			Example 5	Colloids, organics, microorganisms, oxides, and sulfate scale	97
Control test	Colloids, organics, microorganisms, oxides, and sulfate scale	86

As can be seen from table 1, the cleaning agent for a disc membrane of the present invention requires the components of the raw materials to be mixed to achieve a more excellent cleaning effect, but the cleaning effect of the penetrant is affected when a component is not added in a proper range, so that the components of the raw materials need to be controlled in a proper range. The disc type membrane cleaning agent has excellent cleaning effect on organic matters, colloid and biological slime, and does not cause any harm to the membrane and environmental pollution.

In summary, the following steps: organic acids such as citric acid and oxalic acid have good treatment effect on organic metal pollutants formed by inorganic salts, so that the organic metal pollutants are separated from the surface of the reverse osmosis membrane and enter the body liquid. The citric acid can not only generate acid effect, but also form complex reaction with organic pollutants on the surface of the reverse osmosis membrane, and the damage to the membrane is less. The added organic acid has relatively larger dosage compared with other raw material components, and the cleaning capability of other components on dirt can be obviously improved by increasing the dosage of the organic acid, particularly the dispersibility and the solubilization of metal ions are improved; the complexing agent mainly has the functions of softening scale and preventing scale formation, and the added surfactant can improve the dispersibility and reduce the interfacial tension, so that the cleaning agent can penetrate into the membrane for deeper cleaning; the octyl phenol polyoxyethylene ether has good emulsification and dispersion effects, antibacterial property and no toxicity, and can improve the cleaning effect; the surfactant is sodium dodecyl benzene sulfonate, is a synthetic anionic surfactant with excellent performance, is easy to foam and low in viscosity, has good degreasing capability, and reduces the surface tension, wetting, penetrating and emulsifying properties of water.

The bactericide in the technical scheme of the invention is isothiazolinone, and the isothiazolinone compound is an internationally recognized high-efficiency and low-toxicity bactericide, has strong inhibiting and killing effects on common bacteria, fungi, algae and the like, and can rapidly and irreversibly inhibit the growth of microorganisms after contacting the microorganisms, thereby causing the death of the microbial cells.

Of course, the present invention may have other embodiments, and based on the embodiments, those skilled in the art can obtain other embodiments without any creative effort, and all of them are within the protection scope of the present invention.

Claims

1. The disc type membrane cleaning agent is characterized by comprising the following components in parts by mass: 30-45 parts of organic acid, 6-12 parts of sodium chloride, 3-6 parts of complexing agent, 7-15 parts of surfactant, 3.5-4.5 parts of bactericide and 20-30 parts of deionized water.

2. The disc-type membrane cleaning agent according to claim 1, wherein the organic acid is one or a combination of two or a combination of three of sulfamic acid, citric acid and oxalic acid.

3. The disc-type membrane cleaning agent according to claim 1, wherein the complexing agent is disodium ethylenediaminetetraacetate.

4. The disc-type membrane cleaning agent as claimed in claim 1, wherein the surfactant is a combination of sodium dodecyl benzene sulfonate and octylphenol polyoxyethylene ether.

5. The disc-type membrane cleaning agent according to claim 1, wherein the bactericide is isothiazolinone.

6. A preparation method of a disc type membrane cleaning agent is characterized by comprising the following steps:

s2: and (3) adding the bactericide when the temperature of the S1 is reduced to 25-30 ℃, and stirring for 10-15min.

7. The preparation method of the disc-type membrane cleaning agent according to claim 6, wherein the disc-type membrane cleaning agent is obtained after the S2 is uniformly stirred, and the stirring speed is 200-500rpm.