CN112474585A - Ultrasonic technology coupling chemical cleaning treatment system and method for membrane assembly - Google Patents
Ultrasonic technology coupling chemical cleaning treatment system and method for membrane assembly Download PDFInfo
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- CN112474585A CN112474585A CN202011250159.0A CN202011250159A CN112474585A CN 112474585 A CN112474585 A CN 112474585A CN 202011250159 A CN202011250159 A CN 202011250159A CN 112474585 A CN112474585 A CN 112474585A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
-
- 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
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a membrane module ultrasonic technology coupling chemical cleaning treatment system and method, wherein the outlet of a flushing water pipeline is divided into two paths, wherein one path is communicated with the inlet of a chemical cleaning water tank through an automatic control valve, the other path is communicated with the inlet of a cleaning tank, the outlet of an acid dosing tank and the outlet of an alkali dosing tank are communicated with the inlet of the chemical cleaning water tank, the outlet of the chemical cleaning water tank is communicated with the inlet of the cleaning tank through a chemical cleaning liquid delivery pump, the outlet of the cleaning tank is divided into two paths after passing through a circulating pump, one path is discharged through an automatic discharge control valve, and the other path is communicated with the inlet of the chemical cleaning water tank; the system and the method have the advantages that the transducer is opposite to the cleaning tank, the ultrasonic generator is connected with the transducer, the cleaning effect on the membrane component is good, the cleaning time is short, the service life of the membrane component can be prolonged, and the operation cost of the system is reduced.
Description
Technical Field
The invention belongs to the field of water treatment, and relates to a membrane module ultrasonic technology coupling chemical cleaning treatment system and method.
Background
The membrane process technologies such as reverse osmosis, ultrafiltration, nanofiltration, microfiltration and the like are widely applied in the field of water treatment, have the advantages of high removal rate of pollutants and impurities in the incoming water, stable quality of the outgoing water, outstanding water production capacity and the like, and provide good guarantee for water demand of enterprises. However, because suspended matters, organic matters, silicon, hardness ions and the like exist in water, inorganic pollutants and organic pollutants are formed in the water during the water treatment process, the membrane flux and the water production rate are reduced, and therefore, the water is often required to be cleaned to recover the performance.
The existing membrane cleaning technology mainly adopts a gas-water combined flushing mode and a chemical cleaning mode, wherein the gas-water combined flushing mode is used for removing an unstable deposition scale layer on the surface of a membrane by utilizing the action of air force and water power, but cannot remove stable scaling substances on the surface of the membrane and pollutants in the gap of the membrane; chemical cleaning is to utilize chemical agents to react with membrane scaling substances, and scale substances (hardness ions, silicon and organic matters) which cannot be removed by flushing and are attached between membrane wires and pores are removed, but because the membrane is of a multilayer porous structure, the membrane at the present stage has long single-time chemical cleaning time and dead angles exist in the cleaning process, part of refractory scale substances and pollutants in the membrane are difficult to completely remove, so that the membrane flux cannot be completely recovered, the water production capacity is attenuated, the cleaning frequency can only be continuously increased in later-stage operation to meet the water production requirement, and the maintenance workload and the operation cost of the membrane system are increased; meanwhile, frequent cleaning can damage the membrane structure, so that the quality of produced water is reduced, the service life of the membrane is influenced, the membrane cannot reach the service life and has to be replaced in advance, and the operation cost is further increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a membrane module ultrasonic technology coupling chemical cleaning treatment system and a membrane module ultrasonic technology coupling chemical cleaning treatment method.
In order to achieve the aim, the ultrasonic technology coupling chemical cleaning treatment system of the membrane component comprises a flushing water pipeline, an automatic control valve, a chemical cleaning water tank, a cleaning tank, an acid dosing tank, an alkali dosing tank, a chemical cleaning liquid delivery pump, a circulating pump, an automatic discharge control valve, an ultrasonic generator and an energy converter;
the outlet of the flushing water pipeline is divided into two paths, wherein one path is communicated with the inlet of the chemical cleaning water tank through an automatic control valve, the other path is communicated with the inlet of the cleaning tank, the outlet of the acid dosing tank and the outlet of the alkali dosing tank are communicated with the inlet of the chemical cleaning water tank, the outlet of the chemical cleaning water tank is communicated with the inlet of the cleaning tank through a chemical cleaning liquid delivery pump, the outlet of the cleaning tank is divided into two paths after passing through a circulating pump, one path is discharged through an automatic discharge control valve, and the other path is communicated with the inlet of the chemical cleaning water tank;
the energy converter is opposite to the cleaning tank, and the ultrasonic generator is connected with the energy converter.
The outlet of the circulating pump is provided with a temperature sensor, an online pH meter and an online turbidity meter.
The outlet of the flushing water pipeline is divided into two paths after passing through the flushing water pump.
And a flushing water flow meter is arranged at the outlet of the flushing water pump.
The transducer is located at the bottom of the cleaning tank.
The outlet of the cleaning tank is divided into two paths after passing through the circulating pump, wherein one path is discharged through the automatic discharge control valve, and the other path is communicated with the inlet of the chemical cleaning water tank through the circulating flow meter.
The ultrasonic technology coupling chemical cleaning treatment method for the membrane assembly comprises the following steps:
1) placing a membrane element to be cleaned in a cleaning tank, enabling water output by a flushing water pipeline to enter the cleaning tank to pre-flush the membrane element so as to remove an unstable scaling layer on the surface of the membrane element, then discharging the membrane element after passing through an automatic discharge control valve, and after flushing is finished, injecting water into the cleaning tank again so as to enable the membrane element to be soaked in flushing water;
2) starting an ultrasonic generator, forming an ultrasonic field of reciprocating vibration in the flushing water through ultrasonic waves generated by an energy converter, forming impact and scouring effects on the dirt layer on the surface and inside of the membrane element by utilizing the cavitation effect of the ultrasonic waves, stripping off the dirt layer on the surface and inside of the membrane element, discharging the flushing water, and then closing a flushing water pump;
3) preparing chemical cleaning acid liquor in a chemical cleaning water tank, closing an automatic discharge control valve, opening an automatic control valve, conveying the chemical cleaning acid liquor into a membrane element through a chemical cleaning liquid conveying pump, recycling the chemical cleaning liquid into the chemical cleaning water tank, removing a residual stubborn inorganic matter scale layer in the membrane element under the double actions of chemical acid cleaning and ultrasonic waves, and finally closing the chemical cleaning liquid conveying pump;
4) soaking the membrane element in chemical cleaning acid liquor, starting a flushing water pump and an automatic discharge control valve after the soaking time is up, flushing the membrane element at a large flow rate, flushing and discharging the cleaning liquid in the cleaning tank until the pH value of the discharged water is close to neutral, stopping flushing and closing the flushing water pump;
5) preparing chemical cleaning alkali liquor in a chemical cleaning water tank, starting a chemical cleaning liquid delivery pump, delivering the chemical cleaning alkali liquor to a membrane element through the chemical cleaning liquid delivery pump, recycling the chemical cleaning liquid to the chemical cleaning water tank, removing a stubborn organic matter scale layer and an oily pollutant remained in the membrane element under the dual actions of chemical alkali cleaning and ultrasonic wave, closing the chemical cleaning liquid delivery pump, and then soaking the membrane element; after soaking, opening the automatic discharge control valve, starting a washing water pump, washing the membrane element at a large flow rate, synchronously washing and discharging the cleaning liquid in the cleaning tank until the pH value of the discharged water is neutral, stopping washing the water pump, and closing the automatic discharge control valve;
6) and (4) closing the ultrasonic generator, opening the automatic discharge control valve, emptying washing water in the cleaning tank, and taking out the membrane element to finish cleaning.
The invention has the following beneficial effects:
the ultrasonic technology coupling chemical cleaning treatment system and method for the membrane component, disclosed by the invention, have the advantages that during specific operation, the ultrasonic physics and chemical cleaning effects are combined, the comprehensive cleaning of deep scaling substances on the surface and in the membrane component is realized through the cavitation effect of ultrasonic waves, meanwhile, the chemical cleaning is cooperated, the stubborn scaling substances are thoroughly removed, the cleaning of the membrane component without dead angles is realized, the cleaning efficiency is greatly improved, the cleaning time is shortened, the cleaning effect is improved, the cleaning time is shorter, the service life of the membrane component is prolonged, and the system operation cost is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the present invention.
Wherein, 1 is a rinsing water pump, 2 is a rinsing water flowmeter, 3 is a rinsing tank, 4 is a transducer, 5 is an ultrasonic generator, 6 is an automatic control valve, 7 is a chemical rinsing water tank, 8 is an acid dosing tank, 9 is an alkali dosing tank, 10 is a chemical rinsing liquid delivery pump, 11 is a circulating pump, 12 is a temperature sensor, 13 is an online pH meter, 14 is an online turbidity meter, 15 is a circulating flowmeter, and 16 is an automatic discharge control valve.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the ultrasonic technology coupling chemical cleaning treatment system for membrane modules according to the present invention includes a flushing water pipeline, an automatic control valve 6, a chemical cleaning water tank 7, a cleaning tank 3, an acid dosing tank 8, an alkali dosing tank 9, a chemical cleaning liquid delivery pump 10, a circulation pump 11, an automatic discharge control valve 16, an ultrasonic generator 5, and a transducer 4; the outlet of the flushing water pipeline is divided into two paths, wherein one path is communicated with the inlet of a chemical cleaning water tank 7 through an automatic control valve 6, the other path is communicated with the inlet of a cleaning tank 3, the outlet of an acid dosing tank 8 and the outlet of an alkali dosing tank 9 are communicated with the inlet of the chemical cleaning water tank 7, the outlet of the chemical cleaning water tank 7 is communicated with the inlet of the cleaning tank 3 through a chemical cleaning liquid delivery pump 10, the outlet of the cleaning tank 3 is divided into two paths through a circulating pump 11, one path is discharged through an automatic discharge control valve 16, and the other path is communicated with the inlet of the chemical cleaning water tank 7; the transducer 4 is opposite to the cleaning tank 3, and the ultrasonic generator 5 is connected with the transducer 4.
The outlet of the circulating pump 11 is provided with a temperature sensor 12, an online pH meter 13 and an online turbidity meter 14.
The outlet of the flushing water pipeline is divided into two paths after passing through the flushing water pump 1.
A washing water flow meter 2 is arranged at the outlet of the washing water pump 1.
The transducer 4 is located at the bottom of the cleaning tank 3.
The outlet of the cleaning tank 3 is divided into two paths after passing through a circulating pump 11, wherein one path is discharged through an automatic discharge control valve 16, and the other path is communicated with the inlet of the chemical cleaning water tank 7 through a circulating flow meter 15.
Referring to fig. 2, the ultrasonic technology coupled chemical cleaning treatment method for the membrane module according to the present invention includes the following steps:
1) to treat the abluent film element and place in washing tank 3, the water of wash water pipeline output enters into washing tank 3 and carries out the pre-flush processing to the film element, in order to get rid of the film element and go up unstable scaling layer on the surface, then discharge behind automatic discharge control valve 16, in order to reduce the secondary dirt of film element and stifled and chemical cleaning's medicament consumption, wash the completion back, pour water into again in washing tank 3, make the film element soak in the sparge water, through the flow according to the detection of sparge water flowmeter 2, control wash water pump 1, make the film element soak in the sparge water, make the flow thatThe flow of the obtained washing water is controlled to be 1-20 m3Between/h;
2) starting the ultrasonic generator 5, forming a reciprocating vibration ultrasonic field in the flushing water through ultrasonic waves generated by the transducer 4, forming impact and scouring effects on the surface and the inner dirt layer of the membrane element by utilizing the cavitation effect of the ultrasonic waves, stripping the dirt layer on the surface and the inner dirt layer of the membrane element, discharging the flushing water, and then closing the flushing water pump 1;
3) preparing chemical cleaning acid liquor in a chemical cleaning water tank 7, closing an automatic discharge control valve 16, opening an automatic control valve 6, conveying the chemical cleaning acid liquor into a membrane element through a chemical cleaning liquid conveying pump 10, recycling the chemical cleaning liquid into the chemical cleaning water tank 7, removing a residual stubborn inorganic matter scale layer in the membrane element under the double actions of chemical acid cleaning and ultrasonic waves, and finally closing the chemical cleaning liquid conveying pump 10;
4) soaking the membrane element in chemical cleaning acid liquor, starting a washing water pump 1 and an automatic discharge control valve 16 after the soaking time is up, washing the membrane element at a large flow rate, simultaneously washing and discharging the cleaning solution in a cleaning tank 3 until the pH value is close to neutral, stopping washing and closing the washing water pump 1;
5) preparing chemical cleaning alkali liquor in a chemical cleaning water tank 7, starting a chemical cleaning liquid delivery pump 10, delivering the chemical cleaning alkali liquor to a membrane element through the chemical cleaning liquid delivery pump 10, recycling the chemical cleaning liquid to the chemical cleaning water tank 7, removing stubborn organic matter scale layers and oily pollutants remained in the membrane element under the dual actions of chemical alkaline cleaning and ultrasonic waves, closing the chemical cleaning liquid delivery pump 10, and then soaking the membrane element; after soaking, opening the automatic discharge control valve 16, starting the washing water pump 1, washing the membrane element at a large flow rate, synchronously washing and discharging the cleaning liquid in the cleaning tank 3 until the pH value is neutral, stopping washing the water pump 1, and closing the automatic discharge control valve 16;
6) and (4) closing the ultrasonic generator 5, opening the automatic discharge control valve 16, emptying the washing water in the washing tank 3, and taking out the membrane element to finish the washing.
In addition, the chemical cleaning step can also judge the type of the pollutant according to the pollutant characteristic diagnosis condition of the membrane element, and perform single chemical cleaning or composite chemical cleaning in a targeted manner, so as to prevent the performance attenuation and cost increase of the membrane element caused by frequent or ineffective cleaning.
Claims (8)
1. An ultrasonic technology coupling chemical cleaning treatment system of a membrane assembly is characterized by comprising a flushing water pipeline, an automatic control valve (6), a chemical cleaning water tank (7), a cleaning tank (3), an acid dosing tank (8), an alkali dosing tank (9), a chemical cleaning liquid delivery pump (10), a circulating pump (11), an automatic discharge control valve (16), an ultrasonic generator (5) and an energy converter (4);
the outlet of the flushing water pipeline is divided into two paths, wherein one path is communicated with the inlet of the chemical cleaning water tank (7) through an automatic control valve (6), the other path is communicated with the inlet of the cleaning tank (3), the outlet of the acid dosing tank (8) and the outlet of the alkali dosing tank (9) are communicated with the inlet of the chemical cleaning water tank (7), the outlet of the chemical cleaning water tank (7) is communicated with the inlet of the cleaning tank (3) through a chemical cleaning liquid delivery pump (10), the outlet of the cleaning tank (3) is divided into two paths after passing through a circulating pump (11), one path is discharged through an automatic discharge control valve (16), and the other path is communicated with the inlet of the chemical cleaning water tank (7);
the energy converter (4) is opposite to the cleaning tank (3), and the ultrasonic generator (5) is connected with the energy converter (4).
2. An ultrasonic-technical-coupled chemical cleaning treatment system of membrane modules according to claim 1, characterized in that a temperature sensor (12) is provided at the outlet of the circulation pump (11).
3. An ultrasonic-technical-coupled chemical cleaning treatment system for membrane modules according to claim 1, characterized in that an on-line pH meter (13) and an on-line turbidity meter (14) are provided at the outlet of the circulation pump (11).
4. An ultrasonic technology coupled chemical cleaning treatment system of a membrane module according to claim 1, characterized in that the outlet of the flushing water pipeline is divided into two paths after passing through the flushing water pump (1).
5. An ultrasonic-technical-coupled chemical cleaning treatment system of membrane modules according to claim 1, characterized in that the outlet of the rinsing water pump (1) is provided with a rinsing water flow meter (2).
6. An ultrasonic technology coupled chemical cleaning treatment system of membrane modules according to claim 1, characterized in that the transducer (4) is located at the bottom of the cleaning tank (3).
7. An ultrasonic technology coupled chemical cleaning treatment system for membrane modules according to claim 1, characterized in that the outlet of the cleaning tank (3) is divided into two paths after passing through a circulating pump (11), wherein one path is discharged through an automatic discharge control valve (16), and the other path is communicated with the inlet of the chemical cleaning water tank (7) through a circulating flow meter (15).
8. An ultrasonic technology coupling chemical cleaning treatment method for a membrane module, which is characterized in that the ultrasonic technology coupling chemical cleaning treatment system based on the membrane module of claim 1 comprises the following steps:
1) the membrane element to be cleaned is placed in the cleaning tank (3), water output by the cleaning water pipeline enters the cleaning tank (3) to pre-clean the membrane element so as to remove an unstable scaling layer on the surface of the membrane element, then the membrane element is discharged through the automatic discharge control valve (16), and after the cleaning is finished, water is injected into the cleaning tank (3) again so that the membrane element is soaked in the cleaning water;
2) starting an ultrasonic generator (5), forming an ultrasonic field of reciprocating vibration in the washing water through ultrasonic waves generated by an energy converter (4), forming impact and scouring effects on the surface and the inner dirt layer of the membrane element by utilizing the cavitation effect of the ultrasonic waves, stripping the dirt layer on the surface and the inner dirt layer of the membrane element, discharging the washing water, and then closing a washing water pump (1);
3) chemical cleaning acid liquor is configured in a chemical cleaning water tank (7), an automatic discharge control valve (16) is closed, an automatic control valve (6) is opened, the chemical cleaning acid liquor is conveyed into a membrane element through a chemical cleaning liquid conveying pump (10), the chemical cleaning liquid is recycled into the chemical cleaning water tank (7), a residual stubborn inorganic matter scale layer inside the membrane element is removed under the double effects of chemical acid cleaning and ultrasonic waves, and finally the chemical cleaning liquid conveying pump (10) is closed;
4) soaking the membrane element in chemical cleaning acid liquor, starting a washing water pump (1) and an automatic discharge control valve (16) after the soaking time is up, washing the membrane element at a large flow rate, simultaneously washing and discharging the cleaning liquid in a cleaning tank (3) until the pH value of the discharged water is close to neutral, stopping washing and closing the washing water pump (1);
5) preparing chemical cleaning alkali liquor in a chemical cleaning water tank (7), starting a chemical cleaning liquid delivery pump (10), delivering the chemical cleaning alkali liquor to a membrane element through the chemical cleaning liquid delivery pump (10), recycling the chemical cleaning liquid to the chemical cleaning water tank (7), removing stubborn organic matter scale layers and oily pollutants remained in the membrane element under the dual actions of chemical alkali cleaning and ultrasonic waves, closing the chemical cleaning liquid delivery pump (10), and then soaking the membrane element; after soaking, opening the automatic discharge control valve (16), starting the washing water pump (1), washing the membrane element at a large flow rate, synchronously washing and discharging the cleaning liquid in the cleaning tank (3) until the pH value of the discharged water is neutral, stopping the washing water pump (1), and closing the automatic discharge control valve (16);
6) and (3) closing the ultrasonic generator (5), opening the automatic discharge control valve (16), emptying washing water in the washing tank (3), and taking out the membrane element to finish washing.
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Cited By (2)
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| CN113069931A (en) * | 2021-05-06 | 2021-07-06 | 镇江沁远电力设备有限公司 | Novel reverse osmosis membrane cleaning process |
| CN113385041A (en) * | 2021-06-18 | 2021-09-14 | 江西蓝星星火有机硅有限公司 | Reverse osmosis membrane chemical cleaning method |
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