CN112473389B - Reverse osmosis membrane repairing agent and reverse osmosis membrane off-line repairing method - Google Patents

Reverse osmosis membrane repairing agent and reverse osmosis membrane off-line repairing method Download PDF

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CN112473389B
CN112473389B CN202011413824.3A CN202011413824A CN112473389B CN 112473389 B CN112473389 B CN 112473389B CN 202011413824 A CN202011413824 A CN 202011413824A CN 112473389 B CN112473389 B CN 112473389B
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osmosis membrane
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CN112473389A (en
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张文君
吕俐
张鸿芳
李桂平
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Tianjin Shangtuo Environmental Protection Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/025—Reverse osmosis; Hyperfiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/16—Use of chemical agents
    • B01D2321/168—Use of other chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/05—Conductivity or salinity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

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Abstract

The invention discloses a reverse osmosis membrane repairing agent which is characterized by comprising a group A agent and a group B agent which are independently configured, wherein the group A agent comprises the following raw materials in parts by weight: 5-15% of one of poly dimethyl ethyl allyl ammonium chloride, poly allyl methyl amine propyl trimethyl ammonium chloride, poly acrylamide trimethyl ammonium chloride and dodecyl dimethyl benzyl ammonium chloride; 25% -35% of glutaraldehyde; the balance of purified water; wherein the B group agent comprises the following raw materials in parts by weight: 5% -10% of one of polyethylene glycol and polyvinyl alcohol; 30-40% of one of sodium polyacrylate, anionic polyacrylamide, polyacrylic acid and polyacrylate; the balance being purified water. The invention also discloses a method for realizing the off-line repair of the reverse osmosis membrane, which can restore the desalination rate of the oxidized reverse osmosis membrane to more than 97 percent, restore the recovery rate of a single membrane to about 15 percent and stably maintain the repair effect for more than half a year.

Description

Reverse osmosis membrane repairing agent and reverse osmosis membrane off-line repairing method
Technical Field
The invention belongs to the field of reverse osmosis membrane repair, and particularly relates to a reverse osmosis membrane repair agent and a reverse osmosis membrane off-line repair method.
Background
The reverse osmosis membrane technology is a membrane separation technology for separating solute from solvent in solution under the drive of pressure, is widely applied to various fields, and becomes one of mainstream technologies of sea water desalination and advanced wastewater treatment. The commercial polyamide reverse osmosis composite membrane consists of three layers of structures, namely a non-woven fabric with a reinforcing effect, a porous polysulfone supporting layer and an aromatic polyamide active separation layer, wherein the aromatic polyamide active separation layer plays a decisive role in the desalination rate.
In the operation process of the reverse osmosis system, pollutants such as inorganic particles, colloid, organic matters and biological pollutants are deposited on the surface of the membrane to cause the reduction of the permeation flux of the membrane, and the chlorine-containing solution is a commonly used membrane cleaning agent and bactericide.
The repair of the reverse osmosis membrane can not only save the purchase cost of a new membrane, but also reduce the pollution of membrane wastes to the environment. The existing repair technology can repair the desalting layer of the reverse osmosis membrane to improve the desalting rate, but does not mention the stability problem of the repairing layer, and if the repairing layer is not firmly connected with the membrane surface, the repairing layer is easy to fall off, so that the desalting rate is not substantially improved.
The technical scheme of Chinese patent application No. 201811515518.3, which is a repair agent and repair method for salt rejection of forward osmosis, nanofiltration and reverse osmosis membranes, mainly overcomes the technical defect that the repair operation can be performed on the membranes in a shutdown state or in a non-shutdown state of a membrane filtration device, but the scheme does not explain the stability of the repair effect.
The invention mainly aims at the stability of the repairing effect of the repairing agent to research and develop a novel repairing agent and a repairing method.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a reverse osmosis membrane repairing agent and a reverse osmosis membrane off-line repairing method, the technology can restore the desalination rate of an oxidized reverse osmosis membrane to more than 97%, the recovery rate of a single membrane can be restored to about 15%, and the repairing effect can be stably maintained for more than half a year.
The invention is realized in such a way that a reverse osmosis membrane repairing agent is characterized by comprising a group A agent and a group B agent which are independently configured, wherein the group A agent comprises the following raw materials in parts by weight:
5-15% of one of poly dimethyl ethyl allyl ammonium chloride, poly allyl methyl amine propyl trimethyl ammonium chloride, poly acrylamide trimethyl ammonium chloride and dodecyl dimethyl benzyl ammonium chloride; 25% -35% of glutaraldehyde; the balance of purified water;
wherein the B group agent comprises the following raw materials in parts by weight:
5% -10% of one of polyethylene glycol and polyvinyl alcohol; 30-40% of one of sodium polyacrylate, anionic polyacrylamide, polyacrylic acid and polyacrylate; the balance being purified water.
A method for realizing off-line repair of the reverse osmosis membrane by using the repair agent; the method is characterized in that: the method comprises the following steps: firstly, removing an oxidized reverse osmosis membrane on a customer site, and then loading the oxidized reverse osmosis membrane into reverse osmosis membrane repairing equipment for repairing; the method comprises the following specific steps:
the first step is as follows: and (4) performing conventional cleaning on the disassembled reverse osmosis membrane, wherein the cleaning pressure is less than 0.45bar, and the cleaning solution flows back circularly. Firstly, acid washing is carried out on the reverse osmosis membrane, the pH value of the acid washing is between 2 and 3, the acid washing time is 20min, after the acid washing is finished, alkali washing is carried out on the reverse osmosis membrane, the pH value of the alkali washing is between 11 and 12, and the alkali washing time is 20 min. After cleaning, washing with tap water until the pH of effluent is 6-9;
the second step is that: carrying out alkali washing on the reverse osmosis membrane cleaned in the first step again, wherein the alkali washing liquid is a sodium dodecyl sulfate aqueous solution, the water inlet pressure during the alkali washing is below 0.45bar, the pH value of the alkali washing is 11-12, the alkali washing time is 20min, and after the alkali washing is finished, washing with tap water is carried out until the pH value of the effluent is 6-9;
the third step: adjusting the pH value of inlet water of the reverse osmosis membrane to be between 5 and 6 by adopting hydrochloric acid, adjusting the temperature of the inlet water to be between 30 and 35 ℃, adding the prepared agent A into the inlet water of the reverse osmosis membrane according to the adding amount of 80 to 100ppm, starting a high-pressure pump, adjusting a concentrated water valve to ensure that the pressure of the inlet water is 10bar, returning reverse osmosis produced water and concentrated water to the inlet water for cyclic restoration, and finishing the restoration of the agent A when the conductivity of the produced water is not changed;
the fourth step: adding the prepared agent B into inlet water of a reverse osmosis membrane according to the adding amount of 10-20ppm, adjusting the inlet water temperature to be 30-35 ℃, starting a high-pressure pump, adjusting a concentrated water valve to ensure that the inlet water pressure is 10bar, returning reverse osmosis produced water and concentrated water to the inlet water for cyclic restoration, and finishing the restoration of the agent B when the conductivity of the produced water is not changed;
the fifth step: and (4) fully opening a concentrated water valve, washing the reverse osmosis membrane surface with purified water for 5min, and standing the device for 1 hour.
And a sixth step: the salt rejection rate of the reverse osmosis membrane to 2000ppm sodium chloride solution was tested at a water inlet pressure of 1.55 MPa.
The invention has the advantages that the invention can recover the desalination rate of the oxidized reverse osmosis membrane to more than 97 percent, the recovery rate of a single membrane to about 15 percent, and the repair effect can be maintained for more than half a year; the waste membrane component wastes resources and is not environment-friendly, the waste of resources can be effectively reduced after the membrane component is repaired, the pollution of the waste membrane component to the environment is reduced, the cost for purchasing a new membrane is greatly saved, the solid waste treatment cost of the waste membrane component is saved, and the economic and social benefits are better.
Drawings
FIG. 1 is a schematic diagram of the repair of a reverse osmosis unit of the present invention.
In the figure: 1. a water inlet tank; 2. a high pressure pump; 3. a concentrate valve; 4. a water inlet pressure gauge; 5. producing water by reverse osmosis; 6. and (4) reverse osmosis concentrated water.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Example 1
Preparation of the repairing agent:
the component and content of the agent A are as follows: 10% of poly (dimethyl ethyl allyl ammonium chloride), 30% of glutaraldehyde and 60% of purified water; the component and content of the agent B are as follows: 7.5% of polyethylene glycol, 35% of sodium polyacrylate and 57.5% of purified water.
The off-line repairing method of the reverse osmosis membrane comprises the following steps: the off-line cleaning is to remove the oxidized reverse osmosis membrane on the customer site and then load the oxidized reverse osmosis membrane into reverse osmosis membrane repairing equipment for repairing.
The first step is as follows: firstly, carrying out acid cleaning on the reverse osmosis membrane, wherein the acid cleaning pressure is 0.4bar, the acid cleaning pH is 2.6, the acid cleaning time is 20min, and after the acid cleaning is finished, carrying out alkali cleaning on the reverse osmosis membrane, wherein the alkali cleaning pressure is 0.4bar, the alkali cleaning pH is 11.3, and the alkali cleaning time is 20 min;
the second step is that: carrying out alkali washing on the washed reverse osmosis membrane again, wherein the alkali washing liquid is a sodium dodecyl sulfate aqueous solution, the alkali washing pressure is 0.4bar, the alkali washing pH is 11.5, the alkali washing time is 20min, and after the alkali washing is finished, washing with tap water until the pH of effluent is neutral;
the third step: adjusting the PH of reverse osmosis inlet water to 5.4 by adopting hydrochloric acid, adjusting the inlet water temperature to 35 ℃, adding the prepared agent A into a water inlet tank 1 of a reverse osmosis repair device (shown in a figure of the device and shown in an attached figure 1) according to the adding amount of 100ppm, starting a high-pressure pump 2, adjusting a concentrated water valve 3 to enable an inlet water pressure gauge 4 to be 10bar, returning reverse osmosis produced water 5 and concentrated water 6 to the water inlet tank 1 for cyclic repair, and finishing the repair of the agent A when the conductivity of the produced water is not changed;
the fourth step: adding the prepared agent B into a water inlet tank 1 of a reverse osmosis repair device (the reverse osmosis repair device is shown in the figure of an attached figure 1) according to the adding amount of 20ppm, adjusting the water inlet temperature to 35 ℃, starting a high-pressure pump 2, adjusting a concentrated water valve 3 to enable a water inlet pressure gauge 4 to be 10bar, returning reverse osmosis produced water 5 and concentrated water 6 to the water inlet tank 1 for circular repair, and finishing the repair of the agent B when the conductivity of the produced water is not changed;
the fifth step: and (3) fully opening the concentrated water valve, flushing the reverse osmosis membrane surface with purified water for 5min, and standing the device for 1 hour.
And a sixth step: the salt rejection rate of the reverse osmosis membrane to 2000ppm sodium chloride solution is tested under the water inlet pressure of 1.55MPa, and the salt rejection rate is 98.9%.
The parameters of the reverse osmosis membrane before and after repair are as follows:
the experimental conditions are as follows: the repairing device (shown in figure 1) is adopted for repairing with the repairing pressure of 10bar
Figure BDA0002817162380000041
Figure BDA0002817162380000051
Example 2
Preparation of the repairing agent:
the component and content of the agent A are as follows: 9% of dodecyl dimethyl benzyl ammonium chloride, 31% of glutaraldehyde and 60% of purified water; the component and content of the agent B are as follows: 8% of polyethylene glycol, 35% of sodium polyacrylate and 57% of purified water.
The off-line repairing method of the reverse osmosis membrane comprises the following steps: the off-line cleaning means that the oxidized reverse osmosis membrane on the customer site is removed and then is loaded into reverse osmosis membrane repairing equipment for repairing.
The first step is as follows: firstly, carrying out acid cleaning on a reverse osmosis membrane, wherein the acid cleaning pressure is 0.3bar, the acid cleaning pH is 2.4, the acid cleaning time is 20min, and after the acid cleaning is finished, carrying out alkali cleaning on the reverse osmosis membrane, wherein the alkali cleaning pressure is 0.3bar, the alkali cleaning pH is 11.6, and the alkali cleaning time is 20 min;
the second step is that: carrying out alkali washing on the washed reverse osmosis membrane again, wherein the alkali washing liquid is a sodium dodecyl sulfate aqueous solution, the alkali washing pressure is 0.3bar, the alkali washing pH is 11.5, the alkali washing time is 20min, and after the alkali washing is finished, washing with tap water until the pH of effluent is neutral;
the third step: adjusting the PH of reverse osmosis inlet water to 5.1 by adopting hydrochloric acid, adding a prepared agent A into a water inlet tank 1 of a reverse osmosis repair device (shown in a figure of the device and shown in an attached figure 1) according to the adding amount of 96ppm, adjusting the inlet water temperature to 35 ℃, starting a high-pressure pump 2, adjusting a concentrated water valve 3 to enable an inlet water pressure gauge 4 to be 10bar, returning reverse osmosis produced water 5 and concentrated water 6 to the water inlet tank 1 for cyclic repair, and finishing the repair of the agent A when the conductivity of the produced water is not changed;
the fourth step: adding the prepared agent B into a water inlet tank 1 of a reverse osmosis repair device (the reverse osmosis repair device is shown in the figure of figure 1) according to the adding amount of 17ppm, adjusting the water inlet temperature to 35 ℃, starting a high-pressure pump 2, adjusting a concentrate valve 3 to enable a water inlet pressure gauge 4 to be 10bar, returning reverse osmosis produced water 5 and concentrate 6 to the water inlet tank 1 for circular repair, and completing the repair of the agent B when the conductivity of the produced water is not changed;
the fifth step: and (3) fully opening the concentrated water valve, flushing the reverse osmosis membrane surface with purified water for 5min, and standing the device for 1 hour.
And a sixth step: the reverse osmosis membrane was tested for rejection of 2000ppm sodium chloride solution at a water inlet pressure of 1.55MPa, with rejection of 97%.
The parameters of the reverse osmosis membrane before and after repair are as follows:
the experimental conditions are as follows: adopting the reverse osmosis repairing device (shown in figure 1) to repair, wherein the repairing pressure is 10bar
Figure BDA0002817162380000061
In conclusion, the restoration agent can restore the desalination rate of the oxidized reverse osmosis membrane to more than 97 percent, the recovery rate of a single membrane can restore to about 15 percent, and the restoration effect can be maintained for more than half a year; the waste membrane component wastes resources and is not environment-friendly, the waste of resources can be effectively reduced after the membrane component is repaired, the pollution of the waste membrane component to the environment is reduced, the cost for purchasing a new membrane is greatly saved, the solid waste treatment cost of the waste membrane component is saved, and the economic and social benefits are better.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (2)

1. A reverse osmosis membrane repairing agent is characterized by comprising a group A agent and a group B agent which are independently configured, wherein the group A agent comprises the following raw materials in parts by weight:
5-15% of one of poly dimethyl ethyl allyl ammonium chloride, poly allyl aminopropyl trimethyl ammonium chloride, poly acrylamide trimethyl ammonium chloride and dodecyl dimethyl benzyl ammonium chloride; 25% -35% of glutaraldehyde; the balance of purified water;
wherein the B group agent comprises the following raw materials in parts by weight:
5% -10% of one of polyethylene glycol and polyvinyl alcohol; 30-40% of one of sodium polyacrylate, anionic polyacrylamide, polyacrylic acid and polyacrylate; the balance being purified water.
2. A method for performing off-line repair of a reverse osmosis membrane using the repair agent of claim 1; the method is characterized in that: the oxidized reverse osmosis membrane on the customer site is disassembled, and then the reverse osmosis membrane is loaded into reverse osmosis membrane repairing equipment for repairing, and the steps are as follows:
the first step is as follows: cleaning the disassembled reverse osmosis membrane in a conventional manner, wherein the cleaning pressure is less than 0.45bar, the cleaning solution flows back in a circulating manner, the reverse osmosis membrane is firstly subjected to acid cleaning, the pH value of the acid cleaning is 2-3, the acid cleaning time is 20min, after the acid cleaning is finished, the alkali cleaning of the reverse osmosis membrane is carried out, the pH value of the alkali cleaning is 11-12, the alkali cleaning time is 20min, after the cleaning is finished, tap water is washed until the pH value of effluent is 6-9;
the second step: carrying out alkali washing on the reverse osmosis membrane cleaned in the first step again, wherein the alkali washing liquid is a sodium dodecyl sulfate aqueous solution, the water inlet pressure during the alkali washing is below 0.45bar, the pH value of the alkali washing is 11-12, the alkali washing time is 20min, and after the alkali washing is finished, washing with tap water is carried out until the pH value of the effluent is 6-9;
the third step: adjusting the pH of inlet water of a reverse osmosis membrane to be between 5 and 6 by adopting hydrochloric acid, adjusting the temperature of the inlet water to be between 30 and 35 ℃, adding a prepared agent A into the inlet water of the reverse osmosis membrane according to the adding amount of 80 to 100ppm, starting a high-pressure pump, adjusting a concentrated water valve to ensure that the pressure of the inlet water is 10bar, returning reverse osmosis produced water and concentrated water to the inlet water for cyclic restoration, and finishing the restoration of the agent A when the conductivity of the produced water is not changed;
the fourth step: adding the prepared agent B into inlet water of a reverse osmosis membrane according to the adding amount of 10-20ppm, adjusting the inlet water temperature to be 30-35 ℃, starting a high-pressure pump, adjusting a concentrated water valve to ensure that the inlet water pressure is 10bar, returning reverse osmosis produced water and concentrated water to the inlet water for cyclic restoration, and finishing restoration of the agent B when the conductivity of the produced water is not changed;
the fifth step: the concentrated water valve is fully opened, and after the reverse osmosis membrane surface is washed by purified water for 5min, the device is kept stand for 1 hour;
and a sixth step: the salt rejection rate of the reverse osmosis membrane to 2000ppm sodium chloride solution was tested at a water inlet pressure of 1.55 MPa.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102709612A (en) * 2012-05-14 2012-10-03 合肥佳联蓄能技术有限公司 Repairing liquid of lead-acid storage battery
CN105820713A (en) * 2016-05-03 2016-08-03 沈阳建筑大学 Self-repairing coating for marine ships and preparation method thereof

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US10183256B2 (en) * 2014-06-04 2019-01-22 Yale University In situ repairing technique for compromised polymeric membranes
WO2018148054A1 (en) * 2017-02-10 2018-08-16 University Of Vermont And State Agricultural College Nanobiocatalyst and nanobiocatalytic membrane
CN109351198A (en) * 2018-12-12 2019-02-19 济南恩沃商贸有限公司 Positive infiltration, nanofiltration and reverse osmosis membrane salt rejection rate renovation agent and restorative procedure
CN110898675A (en) * 2019-12-09 2020-03-24 吉林省电力科学研究院有限公司 Calcium sulfate scale cleaning agent for reverse osmosis membrane and cleaning method
CN111729515B (en) * 2020-07-29 2021-03-16 青岛沁安化工科技有限公司 Nanofiltration membrane repairing agent for brine refining and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102709612A (en) * 2012-05-14 2012-10-03 合肥佳联蓄能技术有限公司 Repairing liquid of lead-acid storage battery
CN105820713A (en) * 2016-05-03 2016-08-03 沈阳建筑大学 Self-repairing coating for marine ships and preparation method thereof

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