CN111514758A - Method for regenerating ultrafiltration membrane by using waste organic reverse osmosis membrane - Google Patents
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- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/145—Ultrafiltration
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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Abstract
The invention discloses a method for regenerating an ultrafiltration membrane by using a waste organic reverse osmosis membrane, which comprises the following steps: chemically cleaning the waste organic reverse osmosis membrane element by using a conventional reverse osmosis membrane cleaning solution, wherein the temperature of the cleaning solution is 23-33 ℃, and the circulation time of the cleaning solution is 3-4 hours; washing the membrane element with demineralized water, wherein the temperature of the demineralized water is controlled to be 28-36 ℃, and the washing time is 5-10 minutes, so as to obtain a membrane element I; adding a waste organic reverse osmosis membrane reconstruction liquid into the first membrane element, and performing soaking cycle treatment on the waste organic reverse osmosis membrane reconstruction liquid for 2-4.5 hours, wherein the temperature of the reconstruction liquid is 28-36 ℃, so as to obtain a second membrane element; recording the flow and the pressure difference change of the waste organic reverse osmosis membrane reconstruction liquid, finishing the reconstruction of the waste organic reverse osmosis membrane into an ultrafiltration membrane by the method, and realizing the reconstruction and utilization of the waste organic reverse osmosis membrane; the reconstruction process is simple to operate, and the organic waste reverse osmosis membrane is converted into the ultrafiltration membrane, so that the membrane material is recycled.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a method for regenerating an ultrafiltration membrane by using a waste organic reverse osmosis membrane.
Background
The reverse osmosis membrane separation technology is an efficient and energy-saving green novel separation technology, has the outstanding characteristics of simple equipment, mild operation conditions, large treatment capacity, high separation efficiency and the like, is widely applied to the fields of seawater and brackish water desalination, wastewater treatment and reclamation, biological product separation, environmental engineering, food, medicine and the like, and obtains good economic and social benefits; in recent years, with increasingly severe global water resource shortage and increasingly severe water pollution, reverse osmosis membrane separation technology is widely applied and paid attention to the fields of sea water desalination, reclaimed water reuse, clean production, drinking water purification and the like. The core and the basis of the reverse osmosis membrane separation technology are high-performance reverse osmosis membranes, and in the using process of the membranes, as small molecular solvents (usually water) continuously permeate through the reverse osmosis membranes, impurities in the solutions are intercepted on the surfaces of the membranes, so that a pollution layer is formed on the surfaces of the membranes, and therefore, the pollution of the reverse osmosis membranes is inevitable in the application process of the reverse osmosis membrane separation technology. Reverse osmosis membrane fouling can be caused by the following process: colloidal particles in the raw water deposit on the membrane-colloidal contamination; deposition of insoluble inorganic salts on the membrane- -fouling; adhesion and growth of microorganisms on the membrane-biological contamination; some components in raw water and the components on the surface of the membrane generate physical or chemical reaction to generate chemical pollution; organic matter in raw water is attached to the surface of the membrane to cause organic pollution. Membrane pollution directly causes the permeation flux of the reverse osmosis membrane to be obviously reduced, the production efficiency of the system is reduced, and the operation cost and energy consumption are increased; meanwhile, membrane fouling will also lead to frequent cleaning of the system, failure of the device to operate properly, severe deterioration of the rejection characteristics of the membrane, deterioration of the quality of the produced water, reduction of the membrane life and frequent replacement of the membrane.
Most users of industrial enterprise desalted water systems can select to use the organic reverse osmosis membrane device and the ion exchanger device to carry out water treatment, after the organic reverse osmosis membrane element reaches the service life, the salt rejection rate is obviously reduced, the normal desalination function is lost, the enterprise needs to replace the old membrane element with the new reverse osmosis membrane element to guarantee normal production, and the treatment of the discarded membrane element in batches brings serious environmental protection pressure to the industry.
Disclosure of Invention
The method for regenerating the ultrafiltration membrane by using the waste organic reverse osmosis membrane is convenient for secondary utilization of the ultrafiltration membrane, solves the serious environmental protection pressure caused by disposal of a large amount of waste membrane elements, and realizes regeneration and utilization of the waste organic reverse osmosis membrane.
In order to achieve the purpose, the invention provides the following technical scheme: a method for regenerating an ultrafiltration membrane by using a waste organic reverse osmosis membrane comprises the following steps:
step 1: chemically cleaning the waste organic reverse osmosis membrane element by using a conventional reverse osmosis membrane cleaning solution, wherein the temperature of the cleaning solution is 23-33 ℃, and the circulation time of the cleaning solution is 3-4 hours;
and step 3: adding a waste organic reverse osmosis membrane reconstruction liquid into the first membrane element, and performing soaking cycle treatment on the waste organic reverse osmosis membrane reconstruction liquid for 2-4.5 hours, wherein the temperature of the reconstruction liquid is 28-36 ℃, so as to obtain a second membrane element;
and 4, step 4: recording the flow rate and the pressure difference change of the waste organic reverse osmosis membrane reconstruction liquid, discharging the waste organic reverse osmosis membrane reconstruction liquid when the flow rate and the pressure difference of the waste organic reverse osmosis membrane reconstruction liquid reach design indexes, and flushing a membrane element II with demineralized water to obtain a membrane element III;
and 5: and circulating the third membrane element for 24-38 minutes through 1.5-2.5% hydrochloric acid solution, then flushing the third membrane element with demineralized water, flushing the pH to be neutral, exiting the third membrane element, sending to a testing machine for testing, recording the testing pressure difference of the regenerated membrane, and exiting after the test is qualified to obtain a fourth membrane element for later use.
As a preferred technical scheme of the invention, the reconstructed ultrafiltration membrane component comprises a reconstructed ultrafiltration membrane solution tank, a heating base is arranged at the bottom of the reconstructed ultrafiltration membrane solution tank, a thermometer is arranged on the side surface of the reconstructed ultrafiltration membrane solution tank, a liquid inlet pump is arranged on the reconstructed ultrafiltration membrane solution tank, a liquid outlet end of the liquid inlet pump is connected with a liquid inlet pipe, a liquid inlet valve is arranged on the liquid inlet pipe, special reconstructed ultrafiltration membrane equipment is connected to the end of the liquid inlet pipe, a sealing cover is hinged to the reconstructed ultrafiltration membrane special equipment, a plurality of placing grooves are arranged in an inner cavity of the reconstructed ultrafiltration membrane special equipment, a fixing frame is arranged at a position, close to the bottom, of the inner cavity of each placing groove, a circulating pipe is connected to the bottom of the reconstructed ultrafiltration membrane special equipment and is connected with the reconstructed ultrafiltration membrane solution, Liquid flowmeter and liquid pressure gauge.
As a preferred technical scheme of the invention, in the step 4, waste organic reverse osmosis membrane reconstruction liquid with the concentration of 1.5% is configured in the reconstruction ultrafiltration membrane solution tank, a second membrane element is placed in a placing groove in the reconstruction ultrafiltration membrane special equipment, a heating base is opened through an external controller, the waste organic reverse osmosis membrane reconstruction liquid in the reconstruction ultrafiltration membrane solution tank is heated to 40 ℃ and is kept, a liquid inlet valve and a liquid inlet pump are opened through the external controller, the waste organic reverse osmosis membrane reconstruction liquid is injected into the reconstruction ultrafiltration membrane special equipment provided with the second membrane element, then the second membrane element is soaked in the reconstruction ultrafiltration membrane special equipment for 3-5 hours, and the liquid outlet valve, the liquid inlet valve and a circulating pump are controlled to be opened for 2 hours through the external controller.
In a preferable technical scheme of the invention, in the step 5, 2-5% hydrochloric acid solution is configured in the reconstructed ultrafiltration membrane solution tank, and the membrane element is subjected to three-cycle flushing for 30-90 minutes by using 2-5% hydrochloric acid solution and then is discharged.
As a preferable technical scheme, the reconstructed ultrafiltration membrane solution tank is an acid and alkali resistant solution tank.
As a preferable technical scheme of the invention, the waste organic reverse osmosis membrane regeneration liquid is an acidic or alkaline or neutral inorganic oxidant, and the concentration of the waste organic reverse osmosis membrane regeneration liquid is 10-80%.
As a preferable technical scheme of the invention, the acidic waste organic reverse osmosis membrane regenerated liquid is hydrogen peroxide or sodium percarbonate.
Compared with the prior art, the invention has the beneficial effects that: through the treatment and detection of liquid medicines and equipment such as waste organic reverse osmosis membrane regeneration liquid, hydrochloric acid solution, demineralized water and a regenerated membrane testing machine, the waste organic reverse osmosis membrane is convenient to reproduce an ultrafiltration membrane for use, the disposal of a large quantity of waste organic reverse osmosis membrane elements is realized, and the method is economical and environment-friendly.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
In the figure: the device comprises a reconstructed ultrafiltration membrane solution tank 1, a liquid inlet pump 2, a fixing frame 3, reconstructed ultrafiltration membrane special equipment 4, a liquid outlet valve 5, a placing groove 6, a sealing cover 7, a liquid inlet valve 8, a liquid inlet pipe 9, a circulating pipe 10, a circulating pump 11, a heating base 12, a thermometer 13, a liquid flowmeter 14 and a liquid pressure gauge 15.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the invention provides a technical scheme that: a method for regenerating an ultrafiltration membrane by using a waste organic reverse osmosis membrane comprises the following steps:
step 1: chemically cleaning the waste organic reverse osmosis membrane element by using a conventional reverse osmosis membrane cleaning solution, wherein the temperature of the cleaning solution is 23 ℃, and the circulation time of the cleaning solution is 3 hours;
and step 3: adding a waste organic reverse osmosis membrane reconstruction liquid into the first membrane element, and performing soaking cycle treatment on the waste organic reverse osmosis membrane reconstruction liquid for 2 hours, wherein the temperature of the reconstruction liquid is 28 ℃, so as to obtain a second membrane element;
and 4, step 4: recording the flow rate and the pressure difference change of the waste organic reverse osmosis membrane reconstruction liquid, discharging the waste organic reverse osmosis membrane reconstruction liquid when the flow rate and the pressure difference of the waste organic reverse osmosis membrane reconstruction liquid reach design indexes, and flushing a membrane element II with demineralized water to obtain a membrane element III;
and 5: and circulating the third membrane element for 24 minutes through 1.5% hydrochloric acid solution, then flushing the third membrane element with demineralized water, flushing the pH to be neutral, withdrawing the third membrane element, sending the third membrane element to a testing machine for testing, recording the testing pressure difference of the regenerated membrane, and withdrawing the third membrane element after the third membrane element is qualified to obtain a fourth membrane element for later use.
The reconstructed ultrafiltration membrane component comprises a reconstructed ultrafiltration membrane solution tank 1, a heating base 12 is arranged at the bottom of the reconstructed ultrafiltration membrane solution tank 1, a thermometer 13 is arranged on the side surface of the reconstructed ultrafiltration membrane solution tank 1, a liquid inlet pump 2 is arranged on the reconstructed ultrafiltration membrane solution tank 1, a liquid inlet pipe 9 is connected to the liquid outlet end of the liquid inlet pump 2, a liquid inlet valve 8 is arranged on the liquid inlet pipe 9, the end part of the liquid inlet pipe 9 is connected with a reconstructed ultrafiltration membrane special device 4, a sealing cover 7 is hinged on the reconstructed ultrafiltration membrane special device 4, a plurality of placing grooves 6 are arranged in the inner cavity of the reconstructed ultrafiltration membrane special device 4, a fixing frame 3 is arranged at the position, close to the bottom, of the inner cavity of each placing groove 6, a circulating pipe 10 is connected to the bottom of the reconstructed ultrafiltration membrane special device 4, the circulating pipe 10 is connected, in the step 4, 1.5% waste organic reverse osmosis membrane reconstruction liquid is configured in the reconstruction ultrafiltration membrane solution tank 1, a second membrane element is placed in a placing groove 6 in the reconstruction ultrafiltration membrane special device 4, a heating base 12 is opened through an external controller, the waste organic reverse osmosis membrane reconstruction liquid in the reconstruction ultrafiltration membrane solution tank 1 is heated to 40 ℃ and is kept, a liquid inlet valve 8 and a liquid inlet pump 2 are opened through the external controller, the waste organic reverse osmosis membrane reconstruction liquid is injected into the reconstruction ultrafiltration membrane special device 4 provided with the second membrane element, the second membrane element is soaked in the reconstruction ultrafiltration membrane special device 4 for 3 hours, a liquid outlet valve 5, a liquid inlet valve 8 and a circulating pump 11 are controlled to be opened for 2 hours through the external controller, 2% hydrochloric acid solution is configured in the reconstruction ultrafiltration membrane solution tank 1 when the step 5 is performed on the ultrafiltration membrane element, the membrane element is washed for three cycles through 2% hydrochloric acid solution for 30 minutes and then discharged, the reconstructed ultrafiltration membrane solution tank 1 is an acid-alkali resistant solution tank, the regenerated liquid of the waste organic reverse osmosis membrane is an acidic or alkaline or neutral inorganic oxidant, the concentration of the regenerated liquid of the waste organic reverse osmosis membrane is 30%, and the regenerated liquid of the acidic waste organic reverse osmosis membrane is hydrogen peroxide or sodium percarbonate.
Example 2:
the preparation process of the method for regenerating the ultrafiltration membrane by using the waste organic reverse osmosis membrane provided by the embodiment is the same as that of the embodiment 1, and only the mass ratio of the following preparation raw materials is adjusted:
a method for regenerating an ultrafiltration membrane by using a waste organic reverse osmosis membrane comprises the following steps:
step 1: chemically cleaning the waste organic reverse osmosis membrane element by using a conventional reverse osmosis membrane cleaning solution, wherein the temperature of the cleaning solution is 25 ℃, and the circulation time of the cleaning solution is 3.2 hours;
and step 3: adding a waste organic reverse osmosis membrane reconstruction liquid into the first membrane element, and performing soaking cycle treatment on the waste organic reverse osmosis membrane reconstruction liquid for 3 hours, wherein the temperature of the reconstruction liquid is 30 ℃, so as to obtain a second membrane element;
and 4, step 4: recording the flow rate and the pressure difference change of the waste organic reverse osmosis membrane reconstruction liquid, discharging the waste organic reverse osmosis membrane reconstruction liquid when the flow rate and the pressure difference of the waste organic reverse osmosis membrane reconstruction liquid reach design indexes, and flushing a membrane element II with demineralized water to obtain a membrane element III;
and 5: and circulating the third membrane element for 26 minutes through 1.8% hydrochloric acid solution, then flushing the third membrane element with demineralized water, flushing the pH to be neutral, withdrawing the third membrane element, sending the third membrane element to a testing machine for testing, recording the testing pressure difference of the regenerated membrane, and withdrawing the third membrane element after the third membrane element is qualified to obtain a fourth membrane element for later use.
The reconstructed ultrafiltration membrane component comprises a reconstructed ultrafiltration membrane solution tank 1, a heating base 12 is arranged at the bottom of the reconstructed ultrafiltration membrane solution tank 1, a thermometer 13 is arranged on the side surface of the reconstructed ultrafiltration membrane solution tank 1, a liquid inlet pump 2 is arranged on the reconstructed ultrafiltration membrane solution tank 1, a liquid inlet pipe 9 is connected to the liquid outlet end of the liquid inlet pump 2, a liquid inlet valve 8 is arranged on the liquid inlet pipe 9, the end part of the liquid inlet pipe 9 is connected with a reconstructed ultrafiltration membrane special device 4, a sealing cover 7 is hinged on the reconstructed ultrafiltration membrane special device 4, a plurality of placing grooves 6 are arranged in the inner cavity of the reconstructed ultrafiltration membrane special device 4, a fixing frame 3 is arranged at the position, close to the bottom, of the inner cavity of each placing groove 6, a circulating pipe 10 is connected to the bottom of the reconstructed ultrafiltration membrane special device 4, the circulating pipe 10 is connected, in the step 4, 1.5% waste organic reverse osmosis membrane reconstruction liquid is configured in the reconstruction ultrafiltration membrane solution tank 1, a second membrane element is placed in a placing groove 6 in the reconstruction ultrafiltration membrane special device 4, a heating base 12 is opened through an external controller, the waste organic reverse osmosis membrane reconstruction liquid in the reconstruction ultrafiltration membrane solution tank 1 is heated to 40 ℃ and is kept, a liquid inlet valve 8 and a liquid inlet pump 2 are opened through the external controller, the waste organic reverse osmosis membrane reconstruction liquid is injected into the reconstruction ultrafiltration membrane special device 4 provided with the second membrane element, the second membrane element is soaked in the reconstruction ultrafiltration membrane special device 4 for 3-5 hours, a liquid outlet valve 5, a liquid inlet valve 8 and a circulating pump 11 are opened for 2 hours under the control of the external controller, 3% hydrochloric acid solution is configured in the reconstruction ultrafiltration membrane solution tank 1, the third membrane element is washed for 45 minutes through the 3% hydrochloric acid solution and then discharged, the reconstructed ultrafiltration membrane solution tank 1 is an acid-alkali-resistant solution tank, the regenerated liquid of the waste organic reverse osmosis membrane is an acidic or alkaline or neutral inorganic oxidant, the concentration of the regenerated liquid of the waste organic reverse osmosis membrane is 60%, and the regenerated liquid of the acidic waste organic reverse osmosis membrane is hydrogen peroxide or sodium percarbonate.
Example 3:
the preparation process of the method for regenerating the ultrafiltration membrane by using the waste organic reverse osmosis membrane provided by the embodiment is the same as that of the embodiment 1, and only the mass ratio of the following preparation raw materials is adjusted:
a method for regenerating an ultrafiltration membrane by using a waste organic reverse osmosis membrane comprises the following steps:
step 1: chemically cleaning the waste organic reverse osmosis membrane element by using a conventional reverse osmosis membrane cleaning solution, wherein the temperature of the cleaning solution is 27 ℃, and the circulation time of the cleaning solution is 3.5 hours;
and step 3: adding a waste organic reverse osmosis membrane reconstruction liquid into the first membrane element, and performing soaking cycle treatment on the waste organic reverse osmosis membrane reconstruction liquid for 3.5 hours, wherein the temperature of the reconstruction liquid is 32 ℃, so as to obtain a second membrane element;
and 4, step 4: recording the flow rate and the pressure difference change of the waste organic reverse osmosis membrane reconstruction liquid, discharging the waste organic reverse osmosis membrane reconstruction liquid when the flow rate and the pressure difference of the waste organic reverse osmosis membrane reconstruction liquid reach design indexes, and flushing a membrane element II with demineralized water to obtain a membrane element III;
and 5: and circulating the third membrane element for 30 minutes through 2% hydrochloric acid solution, then flushing the third membrane element with demineralized water, flushing the pH to be neutral, withdrawing the third membrane element, sending the third membrane element to a testing machine for testing, recording the testing pressure difference of the regenerated membrane, and withdrawing the third membrane element after the test is qualified to obtain the fourth membrane element for later use.
The reconstructed ultrafiltration membrane component comprises a reconstructed ultrafiltration membrane solution tank 1, a heating base 12 is arranged at the bottom of the reconstructed ultrafiltration membrane solution tank 1, a thermometer 13 is arranged on the side surface of the reconstructed ultrafiltration membrane solution tank 1, a liquid inlet pump 2 is arranged on the reconstructed ultrafiltration membrane solution tank 1, a liquid inlet pipe 9 is connected to the liquid outlet end of the liquid inlet pump 2, a liquid inlet valve 8 is arranged on the liquid inlet pipe 9, the end part of the liquid inlet pipe 9 is connected with a reconstructed ultrafiltration membrane special device 4, a sealing cover 7 is hinged on the reconstructed ultrafiltration membrane special device 4, a plurality of placing grooves 6 are arranged in the inner cavity of the reconstructed ultrafiltration membrane special device 4, a fixing frame 3 is arranged at the position, close to the bottom, of the inner cavity of each placing groove 6, a circulating pipe 10 is connected to the bottom of the reconstructed ultrafiltration membrane special device 4, the circulating pipe 10 is connected, in the step 4, 1.5% waste organic reverse osmosis membrane reconstruction liquid is configured in the reconstructed ultrafiltration membrane solution tank 1, a second membrane element is placed in a placing groove 6 in the reconstructed ultrafiltration membrane special device 4, a heating base 12 is opened through an external controller, the waste organic reverse osmosis membrane reconstruction liquid in the reconstructed ultrafiltration membrane solution tank 1 is heated to 40 ℃ and is kept, a liquid inlet valve 8 and a liquid inlet pump 2 are opened through the external controller, the waste organic reverse osmosis membrane reconstruction liquid is injected into the reconstructed ultrafiltration membrane special device 4 provided with the second membrane element, the second membrane element is soaked in the reconstructed ultrafiltration membrane special device 4 for 4.2 hours, a liquid outlet valve 5, a liquid inlet valve 8 and a circulating pump 11 are controlled to be opened for 2 hours through the external controller, 4% hydrochloric acid solution is configured in the reconstructed ultrafiltration membrane solution tank 1, the membrane element is washed for three times through 4% hydrochloric acid solution and discharged after 65 minutes, the reconstructed ultrafiltration membrane solution tank 1 is an acid-alkali resistant solution tank, the regenerated liquid of the waste organic reverse osmosis membrane is an acidic or alkaline or neutral inorganic oxidant, the concentration of the regenerated liquid of the waste organic reverse osmosis membrane is 60%, and the regenerated liquid of the acidic waste organic reverse osmosis membrane is hydrogen peroxide or sodium percarbonate.
Example 4:
the preparation process of the method for regenerating the ultrafiltration membrane by using the waste organic reverse osmosis membrane provided by the embodiment is the same as that of the embodiment 1, and only the mass ratio of the following preparation raw materials is adjusted:
a method for regenerating an ultrafiltration membrane by using a waste organic reverse osmosis membrane comprises the following steps:
step 1: chemically cleaning the waste organic reverse osmosis membrane element by using a conventional reverse osmosis membrane cleaning solution, wherein the temperature of the cleaning solution is 33 ℃, and the circulation time of the cleaning solution is 4 hours;
and step 3: adding a waste organic reverse osmosis membrane reconstruction liquid into the first membrane element, and performing soaking cycle treatment on the waste organic reverse osmosis membrane reconstruction liquid for 4.5 hours, wherein the temperature of the reconstruction liquid is 36 ℃, so as to obtain a second membrane element;
and 4, step 4: recording the flow rate and the pressure difference change of the waste organic reverse osmosis membrane reconstruction liquid, discharging the waste organic reverse osmosis membrane reconstruction liquid when the flow rate and the pressure difference of the waste organic reverse osmosis membrane reconstruction liquid reach design indexes, and flushing a membrane element II with demineralized water to obtain a membrane element III;
and 5: and circulating the third membrane element for 38 minutes through 2.5% hydrochloric acid solution, then draining, flushing the third membrane element with demineralized water, flushing the pH to be neutral, withdrawing the third membrane element, sending to a testing machine for testing, recording the testing pressure difference of the regenerated membrane, and withdrawing the membrane element after the test is qualified to obtain the fourth membrane element for later use.
The reconstructed ultrafiltration membrane component comprises a reconstructed ultrafiltration membrane solution tank 1, a heating base 12 is arranged at the bottom of the reconstructed ultrafiltration membrane solution tank 1, a thermometer 13 is arranged on the side surface of the reconstructed ultrafiltration membrane solution tank 1, a liquid inlet pump 2 is arranged on the reconstructed ultrafiltration membrane solution tank 1, a liquid inlet pipe 9 is connected to the liquid outlet end of the liquid inlet pump 2, a liquid inlet valve 8 is arranged on the liquid inlet pipe 9, the end part of the liquid inlet pipe 9 is connected with a reconstructed ultrafiltration membrane special device 4, a sealing cover 7 is hinged on the reconstructed ultrafiltration membrane special device 4, a plurality of placing grooves 6 are arranged in the inner cavity of the reconstructed ultrafiltration membrane special device 4, a fixing frame 3 is arranged at the position, close to the bottom, of the inner cavity of each placing groove 6, a circulating pipe 10 is connected to the bottom of the reconstructed ultrafiltration membrane special device 4, the circulating pipe 10 is connected, in the step 4, 1.5% waste organic reverse osmosis membrane reconstruction liquid is configured in the reconstruction ultrafiltration membrane solution tank 1, a second membrane element is placed in a placing groove 6 in the reconstruction ultrafiltration membrane special device 4, a heating base 12 is opened through an external controller, the waste organic reverse osmosis membrane reconstruction liquid in the reconstruction ultrafiltration membrane solution tank 1 is heated to 40 ℃ and is kept, a liquid inlet valve 8 and a liquid inlet pump 2 are opened through the external controller, the waste organic reverse osmosis membrane reconstruction liquid is injected into the reconstruction ultrafiltration membrane special device 4 provided with the second membrane element, the second membrane element is soaked in the reconstruction ultrafiltration membrane special device 4 for 5 hours, a liquid outlet valve 5, a liquid inlet valve 8 and a circulating pump 11 are controlled to be opened for 2 hours through the external controller, 5% hydrochloric acid solution is configured in the reconstruction ultrafiltration membrane solution tank 1 when the step 5 is performed on the ultrafiltration membrane element, the membrane element is washed for three cycles through 5% hydrochloric acid solution for 90 minutes and then discharged, the reconstructed ultrafiltration membrane solution tank 1 is an acid-alkali resistant solution tank, the regenerated liquid of the waste organic reverse osmosis membrane is an acidic or alkaline or neutral inorganic oxidant, the concentration of the regenerated liquid of the waste organic reverse osmosis membrane is 80%, and the regenerated liquid of the acidic waste organic reverse osmosis membrane is hydrogen peroxide or sodium percarbonate.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A method for regenerating an ultrafiltration membrane by using a waste organic reverse osmosis membrane is characterized by comprising the following steps: the method comprises the following steps:
step 1: chemically cleaning the waste organic reverse osmosis membrane element by using a conventional reverse osmosis membrane cleaning solution, wherein the temperature of the cleaning solution is 23-33 ℃, and the circulation time of the cleaning solution is 3-4 hours;
step 2; washing the membrane element with demineralized water, wherein the temperature of the demineralized water is controlled to be 28-36 ℃, and the washing time is 5-10 minutes, so as to obtain a membrane element I;
and step 3: adding a waste organic reverse osmosis membrane reconstruction liquid into the first membrane element, and performing soaking cycle treatment on the waste organic reverse osmosis membrane reconstruction liquid for 2-4.5 hours, wherein the temperature of the reconstruction liquid is 28-36 ℃, so as to obtain a second membrane element;
and 4, step 4: recording the flow rate and the pressure difference change of the waste organic reverse osmosis membrane reconstruction liquid, discharging the waste organic reverse osmosis membrane reconstruction liquid when the flow rate and the pressure difference of the waste organic reverse osmosis membrane reconstruction liquid reach design indexes, and flushing a membrane element II with demineralized water to obtain a membrane element III;
and 5: and circulating the third membrane element for 24-38 minutes through 1.5-2.5% hydrochloric acid solution, then flushing the third membrane element with demineralized water, flushing the pH to be neutral, exiting the third membrane element, sending to a testing machine for testing, recording the testing pressure difference of the regenerated membrane, and exiting after the test is qualified to obtain a fourth membrane element for later use.
2. The method for reconstructing the ultrafiltration membrane by using the waste organic reverse osmosis membrane as claimed in claim 1, wherein the method comprises the following steps: the reconstructed ultrafiltration membrane component comprises a reconstructed ultrafiltration membrane solution tank, the bottom of the reconstructed ultrafiltration membrane solution tank is provided with a heating base, a thermometer is arranged on the side surface of the reconstructed ultrafiltration membrane solution tank, a liquid inlet pump is arranged on the reconstructed ultrafiltration membrane solution tank, the liquid outlet end of the liquid inlet pump is connected with a liquid inlet pipe, a liquid inlet valve is arranged on the liquid inlet pipe, the end part of the liquid inlet pipe is connected with special equipment for the reconstructed ultrafiltration membrane, the special device for the reconstructed ultrafiltration membrane is hinged with a sealing cover, the inner cavity of the special device for the reconstructed ultrafiltration membrane is provided with a plurality of placing grooves, a fixed mount is arranged at the position of the inner cavity of the placing groove close to the bottom, the bottom of the special device for the reconstructed ultrafiltration membrane is connected with a circulating pipe, the circulating pipe is connected with the reconstructed ultrafiltration membrane solution tank through a circulating pump, and a liquid outlet valve, a liquid flowmeter and a liquid pressure gauge are respectively arranged on the circulating pipe.
3. The method for reconstructing the ultrafiltration membrane by using the waste organic reverse osmosis membrane as claimed in claim 2, wherein the method comprises the following steps: when the step 4 is carried out, 1.5% waste organic reverse osmosis membrane reconstruction liquid is configured in the reconstruction ultrafiltration membrane solution tank, a second membrane element is placed in a placing groove in the reconstruction ultrafiltration membrane special equipment, a heating base is started through an external controller, the waste organic reverse osmosis membrane reconstruction liquid in the reconstruction ultrafiltration membrane solution tank is heated to 40 ℃ and is kept, a liquid inlet valve and a liquid inlet pump are started through the external controller, the waste organic reverse osmosis membrane reconstruction liquid is injected into the reconstruction ultrafiltration membrane special equipment with the second membrane element, then the second membrane element is soaked in the reconstruction ultrafiltration membrane special equipment for 3-5 hours, and the liquid outlet valve, the liquid inlet valve and a circulating pump are controlled to be started for 2 hours through the external controller.
4. The method for reconstructing the ultrafiltration membrane by using the waste organic reverse osmosis membrane as claimed in claim 2, wherein the method comprises the following steps: and (5) when the step (5) is carried out, a 2-5% hydrochloric acid solution is configured in the reconstructed ultrafiltration membrane solution tank, and the membrane elements are subjected to three-cycle flushing for 30-90 minutes through the 2-5% hydrochloric acid solution and then discharged.
5. The method for reconstructing the ultrafiltration membrane by using the waste organic reverse osmosis membrane as claimed in claim 2, wherein the method comprises the following steps: the reconstructed ultrafiltration membrane solution tank is an acid and alkali resistant solution tank.
6. The method for reconstructing the ultrafiltration membrane by using the waste organic reverse osmosis membrane as claimed in claim 1, wherein the method comprises the following steps: the waste organic reverse osmosis membrane regeneration liquid is an acidic or alkaline or neutral inorganic oxidant, and the concentration of the waste organic reverse osmosis membrane regeneration liquid is 10-80%.
7. The method for reconstructing the ultrafiltration membrane by using the waste organic reverse osmosis membrane as claimed in claim 6, wherein the method comprises the following steps: the acidic waste organic reverse osmosis membrane regenerated liquid is hydrogen peroxide or sodium percarbonate.
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| CN112295412A (en) * | 2020-10-20 | 2021-02-02 | 天津理工大学 | Ultrafiltration degradation regeneration method for waste reverse osmosis membrane by ultraviolet enhanced oxidation |
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| CN103706257A (en) * | 2013-12-28 | 2014-04-09 | 太平洋水处理工程有限公司 | Method for recycling waste polyamide reverse-osmosis membrane |
| CN103949164A (en) * | 2014-05-14 | 2014-07-30 | 师宗煤焦化工有限公司 | Chemical cleaning method for reverse osmosis membrane element |
| CN105214507A (en) * | 2015-11-12 | 2016-01-06 | 师宗煤焦化工有限公司 | The cleaning method of reverse-osmosis membrane element |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112295412A (en) * | 2020-10-20 | 2021-02-02 | 天津理工大学 | Ultrafiltration degradation regeneration method for waste reverse osmosis membrane by ultraviolet enhanced oxidation |
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