CN110898674A

CN110898674A - Water purifier reverse osmosis membrane cleaning agent and preparation method thereof

Info

Publication number: CN110898674A
Application number: CN201911196135.9A
Authority: CN
Inventors: 钱伟国
Original assignee: Jiangsu Dazhubao Environmental Technology Co Ltd
Current assignee: Jiangsu Dazhubao Environmental Technology Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-03-24

Abstract

The invention relates to the technical field of purified water, and discloses a reverse osmosis membrane cleaning agent for a water purifier, which comprises the following components in parts by weight, wherein the total weight is 100 parts, and the food-grade tartaric acid accounts for 1-2.5 parts; 3.5-5.5 parts of food-grade citric acid; 5-15 parts of polyphosphate; 10-25 parts of sodium dodecyl benzene sulfonate; 5.5-8.5 parts of lysozyme; the remainder was deionized water. The invention also discloses a preparation method of the reverse osmosis membrane cleaning agent for the water purifier. The invention can effectively remove various inorganic precipitates and dirt, inhibit the growth of bacteria, recover the membrane flux, has low cost and is easy to realize commercial production.

Description

Water purifier reverse osmosis membrane cleaning agent and preparation method thereof

Technical Field

The invention relates to the technical field of purified water, in particular to a reverse osmosis membrane cleaning agent for a water purifier and a preparation method thereof.

Background

Because the influence such as tap water colloid, fungus class and hardness, purifier RO membrane (reverse osmosis membrane) often can block up, causes the membrane element at operation in-process differential pressure rise, and the flow descends, can't normally work even to lead to the life cycle of RO membrane to shorten greatly, use cost increases by a wide margin.

The RO membrane blockage of the water purifier is generally divided into two stages, and colloid substances are attached to the surface of the RO membrane in the initial stage to become scaling crystal nuclei; the scale in the subsequent stage is based on the crystal nuclei, and calcite crystal form scale is generated and is firmly attached to the surface of the RO membrane, so that the RO membrane is blocked, and the water outlet flow rate of the RO membrane is reduced.

Because there is no effective cleaning method, the replacement cost of the RO membrane is expensive, and the use cost of the water purifier is very high.

Disclosure of Invention

The present invention aims to solve the above problems and provide a reverse osmosis membrane cleaning agent for a water purifier and a preparation method thereof, wherein one effect is to remove inorganic scale, and the other effect is to dissolve bacteria and colloid. Can effectively remove various inorganic precipitates and dirt, inhibit the growth of bacteria, recover the membrane flux, has low cost and is easy to realize commercial production.

The technical scheme adopted by the invention is as follows:

a reverse osmosis membrane cleaning agent for a water purifier is characterized by comprising the following components in parts by weight, wherein the total weight is 100 parts, and food-grade tartaric acid is 1-2.5 parts; 3.5-5.5 parts of food-grade citric acid; 5-15 parts of polyphosphate; 10-25 parts of sodium dodecyl benzene sulfonate; 5.5-8.5 parts of lysozyme; the remainder was deionized water.

Further, 1.8 parts of food-grade tartaric acid; 4.7 parts of food-grade citric acid; 10 parts of polyphosphate; 15 parts of sodium dodecyl benzene sulfonate; 8.5 parts of lysozyme and the balance of deionized water.

A preparation method of a reverse osmosis membrane cleaning agent for a water purifier is characterized by comprising the following steps:

(1) weighing the tartaric acid, the citric acid, the polyphosphate, the sodium dodecyl benzene sulfonate and the deionized water in parts by weight, adding into a reaction kettle, and stirring and dissolving in a water bath at 30-50 ℃;

(2) adding lysozyme into the solution, continuing stirring for 1-1.5h, and filtering.

The invention has the beneficial effects that:

(1) the food-grade acid can effectively remove scale on the surface of the membrane and improve the speed of dissolving, loosening and falling of the scale;

(2) the scale rapidly flows away with the water flow under the action of the dispersant;

(3) the lysozyme can quickly dissolve crystal nuclei such as bacterial colloid and the like which are initially blocked by the membrane, and can obviously improve the membrane flux and reduce the membrane pressure difference;

(4) the main component of the cleaning agent is high-efficiency harmless substance, is suitable for the water purifier, has low cost and is easy for commercial production.

Detailed Description

The following is a detailed description of the embodiments of the cleaning agent for reverse osmosis membrane of water purifier and the preparation method thereof.

The cleaning agent for the reverse osmosis membrane of the water purifier comprises the following components in parts by weight, wherein the total weight is 100 parts, and 1-2.5 parts of food-grade tartaric acid is contained; 3.5-5.5 parts of food-grade citric acid; 5-15 parts of polyphosphate; 10-25 parts of sodium dodecyl benzene sulfonate; 5.5-8.5 parts of lysozyme; the remainder was deionized water.

Wherein tartaric acid and citric acid are used for removing inorganic scale, polyphosphate is a chelating agent, sodium dodecyl benzene sulfonate is a dispersing agent, lysozyme can dissolve bacterial cell walls, and crystal nuclei such as bacteria on the surface of the RO membrane can be effectively removed.

The preparation method of the reverse osmosis membrane cleaning agent for the water purifier comprises the following steps:

And obtaining the cleaning agent for the reverse osmosis membrane of the water purifier.

The invention is further illustrated by the cleaning process and the control parameters.

Preparing bacteria standard water with pure water (10)³-10⁶CFU/mL) A water sample, simulating bacteria and colloidal substances in water;

the water sample B is prepared by adding standard (taking 100L of experimental water as an example) by using pure water according to the following steps:

(1) 27.75g of anhydrous CaCl was weighed separately₂26.88g of anhydrous NaHCO₃And 5.00g NaCl, dissolved in a small amount of pure water, respectively;

(2) and (3) respectively and independently adding the solutions into 100L of pure water, immediately stirring uniformly after adding each solution, and finally continuously stirring for a while to fully and uniformly mix.

Selecting a confluent 400G reverse osmosis membrane element as an experimental membrane, controlling the water inlet pressure to be 0.8MPa, controlling the net waste ratio to be 1:1, introducing an A water sample for 1.5-3h, then introducing a B water sample for 5.5-7h, standing for 12h, and repeating the processes until the membrane flux is attenuated to 10-15% of the initial flux, which indicates that the membrane is polluted and blocked.

Taking the polluted membrane element for cleaning operation, wherein the formula of the used cleaning agent is as follows:

(1) 1 part of tartaric acid; 3.5 parts of citric acid; 5 parts of polyphosphate; 10 parts of sodium dodecyl benzene sulfonate; 5.5 parts of lysozyme; the remainder was deionized water.

(2) 1.8 parts of tartaric acid; 4.7 parts of citric acid; 10 parts of polyphosphate; 15 parts of sodium dodecyl benzene sulfonate; 8.5 parts of lysozyme; the remainder was deionized water.

(3) 2.5 parts of tartaric acid; 5.5 parts of citric acid; 15 parts of polyphosphate; 25 parts of sodium dodecyl benzene sulfonate; 8.5 parts of lysozyme; the remainder was deionized water.

The specific cleaning effect is shown in the following table:

the foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A cleaning agent for a reverse osmosis membrane of a water purifier is characterized in that: comprises the following components in parts by weight, wherein the total weight is 100 parts, and the food-grade tartaric acid accounts for 1-2.5 parts; 3.5-5.5 parts of food-grade citric acid; 5-15 parts of polyphosphate; 10-25 parts of sodium dodecyl benzene sulfonate; 5.5-8.5 parts of lysozyme; the remainder was deionized water.

2. The cleaning agent for reverse osmosis membranes of water purifiers, according to claim 1, which comprises: 1.8 parts of food-grade tartaric acid; 4.7 parts of food-grade citric acid; 10 parts of polyphosphate; 15 parts of sodium dodecyl benzene sulfonate; 8.5 parts of lysozyme and the balance of deionized water.

3. The preparation method of the cleaning agent for the reverse osmosis membrane of the water purifier as claimed in claim 1 or 2, which is characterized by comprising the following steps: the method comprises the following steps:

(1) weighing tartaric acid, citric acid, polyphosphate, sodium dodecyl benzene sulfonate and deionized water in the weight parts as described in claim 1 or 2, adding into a reaction kettle, and stirring and dissolving in water bath at 30-50 ℃;