CN103341324A - Cleaning method and cleaning system of tubular membrane - Google Patents
Cleaning method and cleaning system of tubular membrane Download PDFInfo
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- CN103341324A CN103341324A CN2013103060847A CN201310306084A CN103341324A CN 103341324 A CN103341324 A CN 103341324A CN 2013103060847 A CN2013103060847 A CN 2013103060847A CN 201310306084 A CN201310306084 A CN 201310306084A CN 103341324 A CN103341324 A CN 103341324A
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Abstract
The invention discloses a cleaning method and a cleaning system of a tubular membrane, and provides a cleaning method and a cleaning system which can recover the membrane flux. The cleaning method comprises the following steps of: cleaning with clean water; cleaning through mixing particles, clean water and air: after mixing particles, clean water and air, and cleaning the mixture of particles, clean water and air in the tubular membrane, wherein air bubbles are broken caused by the collision of air bubbles and particles, energy is released extensively to cause partial vibration, and meanwhile, the particles and air bubbles are both rubbed with the membrane so as to lead to falling of pollutants on the surface of the membrane; and discharging the pollutants to complete the cleaning process. According to the cleaning method disclosed by the invention, the step of cleaning by mixing particles, clean water and gases is added; the air bubbles generated by the gases can be collided with the particles, and energy is released extensively so as to lead to partial vibration; turbulence is formed in a membrane component; particles flow rapidly in a system; and the air bubbles and particles are both rubbed with the surface of the membrane so as to remove surface pollutants. The cleaning effect and the cleaning efficiency can be improved greatly by combining with two aspects.
Description
Technical field
The present invention relates to water-treatment technology field, particularly relate to a kind of cleaning method and purging system of tubular membrane.
Background technology
Along with the reinforcement of environmental consciousness, membrane separation technique has been widely used in industries such as food, medicine, chemical industry.
Can stop up membrane aperture after holding back, be deposited on particle on the film and running up to a certain degree, cause film to pollute, influence membrane flux, thereby influence the separating effect of film.In order to recover membrance permeability amount and separating effect, need clean membrane module.Present cleaning method comprises that physics cleans and Chemical cleaning, and physics cleans general product water backwash or the gas of adopting and cleans, and both combinations are also arranged, but it can only make the separating effect of film temporarily recover.Patent publication No. is that CN1533827A, invention and created name disclose a kind of physics cleaning method for " a kind of system and cleaning method thereof that utilizes soft spheric granules to carry out the film cleaning ", the employed particle diameter of this method is bigger, and particle is the intermittent tubular membrane component that passes through, number of particles is subjected to the influence of current bigger in the purging system, has lost the control to particle concentration in the purging system.According to the placement location of holding back net among this Patent equipment figure, clean the end particle and fail to realize effective recovery.
Summary of the invention
The objective of the invention is at the technological deficiency that exists in the prior art, and a kind of cleaning method that can recover the tubular membrane of membrane flux is provided
Another object of the present invention provides a kind of purging system that can recover membrane flux.
For realizing that the technical scheme that purpose of the present invention adopts is:
A kind of cleaning method of tubular membrane comprises the steps:
(1) clear water cleans;
(2) particle, clear water mix cleaning with air: particle cleans with entering in the tubular membrane component after clear water and air mix, the collision of bubble and particle causes that bubble breaks, large-area releasing energy causes local vibration, simultaneously, particle and bubble all produce friction with film, cause that the pollutant on film surface comes off; The concentration of particle is 40-70g/L, and the volume ratio of air and clear water is 20-30:1;
(3) discharge pollutants, finish cleaning process.
Carrying out air water after clear water cleans cleans.
Mix with air at particle, clear water and to carry out particle before cleaning and clean, in the particle cleaning process, particle cleans with entering in the tubular membrane component after clear water mixes.
The diameter of described particle is 1mm, and described Particle Density is slightly larger than the density of water.
A kind of purging system of tubular membrane comprises circulating tank, particle circulation recover, circulating pump, water sprayer, main-supply road, clear water supply channel, jetting pipeline, air inlet pipeline, water return pipeline and return line; Described particle circulation recover comprises and loops back receptacle, described looping back is equipped with particle and holds back net in the receptacle, the receptacle that loops back that described particle is held back portion off the net is provided with liquid outlet, the receptacle that loops back that described particle is held back online portion is provided with the particle outlet, and described looping back is equipped with agitator in the receptacle; Described main-supply Lu Yiduan is connected with the delivery port of described circulating tank by described circulating pump, and import is connected the other end with the jetting pipeline with the import of described clear water supply channel respectively; The outlet of described jetting pipeline is connected with the import of described water sprayer, the outlet of described air inlet pipeline and described particle outlet back in parallel are connected with the ejecting port of described water sprayer, are connected with the cleaning import of membrane module after the outlet parallel connection of the outlet of described water sprayer and described clear water supply channel; The washing outlet of described membrane module is connected with described return line import, and described return line is leaded up to the particle recovery control valve and is connected with the described receptacle that loops back, and another road is connected with described circulating tank by the particle circulation control valve; The described liquid outlet that loops back on the receptacle is connected with described circulating tank by water return pipeline; Described clear water supply channel is provided with the clear water water inlet control valve, on the described jetting pipeline jetting control valve is installed.
Described main-supply is equipped with flowmeter on the road; Described main-supply is equipped with first Pressure gauge on the road; Second Pressure gauge is installed on the described return line.
On the main-supply road between described circulating pump and the described flowmeter water intaking valve is installed.
On the described air inlet pipeline air intake control valve is installed; Be equipped with between the outlet of described water sprayer and the described membrane module and mix purge control valve.
Described agitator bottom and the described vertical range of holding back net are 1cm, and described agitator is placed on the described receptacle that loops back and departs from position intermediate a little, can control particle concentration and quantity by the size of rotating speed.
Recycle control valve and detection of particles valve are installed on the described return line, and the return line between described recycle control valve and the detection of particles control valve is transparent pipeline.
Compared with prior art, the invention has the beneficial effects as follows:
1, use waterpower cleaning and particle, clear water to mix the method that combines of cleaning with air in the cleaning method of the present invention, it is a kind of continuous cleaning, the uniform and stable property that can keep particle concentration, cleaning performance is good, not only the flux recovery rate of tubular membrane improves, and flux also can keep stable in the long time.
2, cleaning method of the present invention has comprised that particle mixes the step of cleaning with clear water and gas, bubble and particle that gas produces can produce collision, thereby cause collapse of bubbles, large-area releasing energy causes local vibration, in the inner formation of membrane module disturbance, thereby can make the pollutant on film surface be easy to come off.Simultaneously, owing to adopt solid-liquid two-way flow utilization, particle flows in system fast, and bubble and particle are all removed surface contaminant with the film mantle friction.The combination of two aspects can recover membrane flux greatly, improves cleaning performance and cleaning efficiency.
3, purging system of the present invention is by the opening and closing of each valve of control, thereby control respective line conducting, realize that clear water cleaning, air water cleaning, particle mix a plurality of cleaning processes such as cleaning with clear water and gas with clear water cleaning, particle, utilize particle to flow fast intrasystem, remove the pollutant on surface with the film mantle friction, recover membrane flux.This system architecture is simple, and control is convenient.
4, in the purging system of the present invention, the receiving apparatus that loops back with particle, in the circulation recover, put into the particle of some, the water of the circulatory system produces relative vacuum by water sprayer at a high speed, at the following particle of atmospheric effect " suction " water sprayer, particle begins to enter and participates in the whole circulation process, a circulation finishes back particle reflux cycle recover again, because be positioned over holding back net and can being trapped in particle in the circulation recover of circulation recover bottom, particle is finished the folding and unfolding process.Can guarantee effective recovery of particle; the particle of recovery is circulated again; particle is not participated in the circulation of circulating pump; be conducive to protect circulating pump; shortened scavenging period simultaneously; reduced the quantity of the used particle of whole system, shortened the range ability of particle, agitator can rotate under low speed realizes the particle circulation.
5, can control particle concentration in the circulatory system by the control agitator speed in the purging system of the present invention, and maintain stable state, can realize that mechanical performance according to different tubular membrane is adjusted under different flow and the different particle concentrations and clean, draw and select best cleaning parameters.
6, in the purging system of the present invention the detection of particles valve is installed, can realizes the online detection of concentration of particle by the detection of particles valve, be convenient to adjust to according to flux recovery rate and actual needs the actual concentrations of required particle.
7, in the purging system of the present invention, transparent pipeline is used in loop from the detection of particles valve to recycle control valve 17, can observe particle concentration change, change particle concentration size in the rotating speed of agitator and the Level Change purging system according to the variation of transparent pipeline particle color depth.
8, in the purging system of the present invention, the agitator bottom is 1cm with the vertical range of holding back net, and agitator is placed on the circulation recover and departs from the centre position a little, can control particle concentration and quantity by the size of rotating speed.
Description of drawings
Figure 1 shows that the schematic diagram of purging system of the present invention;
Figure 2 shows that the schematic diagram of particle circulation recover.
Among the figure: 1, circulating pump, 2, flowmeter, 3, first Pressure gauge, 4, water sprayer, 5, agitator, 6, particle circulation recover, 7, membrane module, 8, water intaking valve, 9, the clear water water inlet control valve, 10, the jetting control valve, 11, mix purge control valve, 12, the detection of particles valve, 13, blowoff valve, 14, air intake control valve, 15, the particle recovery control valve, 16, the particle circulation control valve, 17, recycle control valve, 18, second Pressure gauge, 19, circulating tank, 20, loop back receptacle, 21, particle is held back net, and 22, the particle outlet, 23, liquid outlet, 24, return line, 25, water return pipeline, 26, the main-supply road, 27, the clear water supply channel, 28, the jetting pipeline, 29, air inlet pipeline.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
The cleaning method of tubular membrane of the present invention comprises the steps:
(1) clear water cleans: adopt conventional method to carry out clear water and clean, the circular flow of water is generally 800L/h.
(2) particle, clear water mix cleaning with air: particle cleans with entering in the tubular membrane component after clear water and air mix, the collision of bubble and particle causes that bubble breaks, large-area releasing energy causes local vibration, simultaneously, particle and bubble all produce friction with film, cause that the pollutant on film surface comes off.The concentration of particle is 40-70g/L, and the volume ratio of air and clear water is 20-30:1.
(3) discharge pollutants, finish cleaning process.
Wherein, particle has preferably the color of settleability and water have preferably in water to distinguish; Particulate material density is slightly larger than water, material such as resin etc.The diameter of described particle is 1mm.
In order to reach best cleaning performance, after clear water cleans, carry out air water and clean, can adopt conventional method to carry out.Mix with air at particle, clear water and to carry out particle before cleaning and clean, in the particle cleaning process, particle cleans with entering in the tubular membrane component after clear water mixes.The cleaning of particle and water can adopt conventional method to carry out.Wherein, membrane module is tubular membrane component.
The schematic diagram of purging system of the present invention comprises circulating tank 19, particle circulation recover 6, circulating pump 2, water sprayer 4, main-supply road 26, clear water supply channel 27, jetting pipeline 28, air inlet pipeline 29, water return pipeline 25 and return line 24 as shown in Figure 1 and Figure 2; Described particle circulation recover 6 comprises and loops back receptacle 20, described looping back is equipped with particle and holds back net 21 in the receptacle 20, the receptacle that loops back that described particle is held back net 21 bottoms is provided with liquid outlet 23, the receptacle that loops back that described particle is held back online portion is provided with particle outlet 22, and described looping back is equipped with agitator 5 in the receptacle 20; Described main-supply road 26 1 ends are connected with the delivery port of described circulating tank 19 by described circulating pump 1, and 28 imports are connected the other end with the jetting pipeline with described clear water supply channel 27 imports respectively; The outlet of described jetting pipeline 28 is connected with the import of described water sprayer 4, the outlet of described air inlet pipeline 29 and described particle outlet 22 backs in parallel are connected with the ejecting port of described water sprayer 4, are connected with the cleaning import of membrane module 7 after the outlet parallel connection of the outlet of described water sprayer 4 and described clear water supply channel 27; The washing outlet of described membrane module 7 is connected with described return line 24 imports, and described return line 24 is leaded up to particle recovery control valve 15 and is connected with the described receptacle 20 that loops back, and another road is connected with described circulating tank 19 by particle circulation control valve 16; The described liquid outlet 23 that loops back on the receptacle is connected with described circulating tank 19 by water return pipeline 25; Described clear water supply channel 27 is provided with clear water water inlet control valve 9, on the described jetting pipeline 28 jetting control valve 10 is installed.Described main-supply is equipped with flowmeter 2 on the road.
First Pressure gauge 3 is installed on the described main-supply road.Second Pressure gauge 18 is installed on the described return line.On the main-supply road between described circulating pump 1 and the described flowmeter 2 water intaking valve 8 is installed.
Air intake control valve 14 is installed on the described air inlet pipeline.
Be equipped with between 4 outlets of described water sprayer and the described membrane module 7 and mix purge control valve 11.
For the ease of circulating tank 19 blowdowns, the bottom of described circulating tank is equipped with blowoff valve 13.
The aperture of holding back net is less than the diameter of particle, and the diameter of particle is less than the minimum diameter of nozzle/trunnion in the water sprayer.
Embodiment 1: the step of using purging system of the present invention to clean is as follows:
1, carry out the mensuration of membrane flux before cleaning earlier: open water intaking valve 8, clear water water inlet control valve 9, particle circulation control valve 16 and recycle control valve 17, other valves are all closed.Clear water enters flowmeter 2 from circulating tank 19 by circulating pump 1 and valve 8, by the size of control water intaking valve 8 rates of discharge, by the reading of recycle control valve 17 controls second Pressure gauge 18, measures flux magnitude under corresponding pressure.When flux reaches the condition that needs cleaning, carry out the cleaning of membrane module.
2, clear water cleans: open water intaking valve 8, clear water water inlet control valve 9, particle circulation control valve 16 and recycle control valve 17, other valves are all closed.Clear water enters flowmeter 2 from circulating tank 19 by circulating pump 1, enters membrane module 7 through clear water water inlet control valve 9 again and cleans, and the water after the cleaning enters return line 24, gets back to circulating tank 19 through recycle control valve 17 and particle circulation control valve 16.Can be by the size control flow of control water intaking valve 8 apertures, the water circular flow is controlled at 800L/h.
3, air water cleans: open jetting control valve 10 again on the basis that clear water cleans, mix purge control valve 11 and air intake control valve 14, clear water enters water sprayer by jetting control valve 10, mix the back sprays from the outlet of water sprayer 4 at a high speed with the air that enters from air intake control valve 14, enter in the membrane module 7 through mixing purge control valve 11, form foaming not of uniform size, bubble in the process of breaking, discharge certain energy, these energy can make the vibration that causes in the certain limit, the pollutant that causes the film surface comes off, and film is carried out air water clean.
4, particle cleans: water intaking valve 8, jetting control valve 10, mixing purge control valve 11, particle recovery control valve 15, recycle control valve 17 are in open mode, and other valves all are in closed condition.Clear water enters flowmeter 2 from circulating tank 19 by circulating pump 1, the aperture of control jetting control valve 10, make water pass through water sprayer 4 with higher speed, enter in the membrane module 7, the process membrane module is by recycle control valve 17, particle recovery control valve 15 enters and loops back in the receptacle 20, start paddle 5 and control the rotating speed of paddle, water and the mix particles that loops back in the receptacle, flow out from particle outlet 22 after the mixing of water and particle, enter in the water sprayer 4, because water sprayer 4 forms the certain vacuum degree easily under high flow velocities, under the ordering about of pressure, particle and water enter membrane module 7 by water sprayer uniformly, and particle and film produce friction, and the film surface is cleaned.The particle that comes out from membrane module and the mixture of water are in recycle control valve 17, particle recovery control valve 15 enter particle circulation recover 6, particle is recycled particles in the receptacle 20 and holds back net 21 and hold back, partially liq flows out from liquid outlet, in water return pipeline 25 enters circulating tank 19, continue to participate in circulation, partially liq flows out from the particle outlet with particle, continues the circulation that particle cleans.Particle circulation recover 6 plays the folding and unfolding particle in whole process, particle does not participate in circulation in the pump.
The aperture of control recycle control valve 17 also can be controlled the size of cleaning pressure.In the particle cleaning process, because the pipeline between detection of particles valve 12 and the recycle control valve 17 is transparent, can observe the concentration of particle, also can open detection of particles valve 12, be used for measuring concentration and the quantity of particle.Wherein the size of the rotating speed of paddle 5 and valve 9 apertures has considerable influence to the concentration of bead particle in cyclic process, and the concentration of general particle is 40-70g/L.
5, particle, water and air clean: on the basis that particle cleans, open air intake control valve 14.Owing to form certain vacuum in the water sprayer 4, air enters water sprayer 4 with particle and water under atmospheric effect, and from water sprayer outlet outflow at a high speed, enter in the membrane module, in membrane module, the collision of bubble and particle causes collapse of bubbles, and large-area releasing energy causes local vibration, causes that the pollutant on film surface comes off.Simultaneously, bubble all contacts with film with particle and produces friction, also can clean the film surface.Two kinds of effect combinations can be strengthened cleaning performance, improve cleaning efficiency.The concentration of particle is 40-70g/L.The volume ratio of air and clear water is 20-30:1.
6, discharge pollutants, finish cleaning process.
Contrast by experiment when only adopting clear water cleaning and particle to clean, can recover 90% of membrane flux.And adopt said method of the present invention to clean, can recover 95% of membrane flux.By experiment, also can recover 95% of membrane flux at the cleaning method that adopts clear water cleaning and particle, water and air to clean two kinds of cleaning way combinations.Therefore, by cleaning method of the present invention and cleaning device, can improve membrane flux, improve the film cleaning performance, thereby can improve the film cleaning efficiency, prolong the film cleaning frequency, reduce the number of times that film cleans, improve the service life of membrane module, further reduce production costs.
The above only is preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. the cleaning method of a tubular membrane is characterized in that, comprises the steps:
(1) clear water cleans;
(2) particle, clear water mix cleaning with air: particle cleans with entering in the tubular membrane component after clear water and air mix, the collision of bubble and particle causes that bubble breaks, large-area releasing energy causes local vibration, simultaneously, particle and bubble all produce friction with film, cause that the pollutant on film surface comes off; The concentration of particle is 40-70g/L, and the volume ratio of air and clear water is 20-30:1;
(3) discharge pollutants, finish cleaning process.
2. the cleaning method of tubular membrane according to claim 1 is characterized in that, carries out air water and clean after clear water cleans.
3. the cleaning method of tubular membrane according to claim 1 and 2 is characterized in that, mixes with air at particle, clear water and carries out particle before cleaning and clean, and in the particle cleaning process, particle cleans with entering in the tubular membrane component after clear water mixes.
4. the cleaning method of tubular membrane according to claim 3 is characterized in that, the diameter of described particle is 1mm, and described Particle Density is slightly larger than the density of water.
5. the purging system of a tubular membrane, it is characterized in that, comprise circulating tank (19), particle circulation recover (6), circulating pump (2), water sprayer (4), main-supply road (26), clear water supply channel (27), jetting pipeline (28), air inlet pipeline (29), water return pipeline (25) and return line (24); Described particle circulation recover (6) comprises and loops back receptacle (20), described looping back is equipped with particle and holds back net (21) in the receptacle (20), the receptacle that loops back that described particle is held back net (21) bottom is provided with liquid outlet (23), the receptacle that loops back that described particle is held back online portion is provided with particle outlet (22), and described looping back is equipped with agitator (5) in the receptacle (20); Described main-supply road (26) one ends are connected with the delivery port of described circulating tank (19) by described circulating pump (1), and import is connected the other end with jetting pipeline (28) with described clear water supply channel (27) import respectively; The outlet of described jetting pipeline (28) is connected with the import of described water sprayer (4), the outlet of described air inlet pipeline (29) and described particle export (22) back in parallel and are connected with the ejecting port of described water sprayer (4), are connected with the cleaning import of membrane module (7) after the outlet parallel connection of the outlet of described water sprayer (4) and described clear water supply channel (27); The washing outlet of described membrane module (7) is connected with described return line (24) import, described return line (24) is leaded up to particle recovery control valve (15) and is connected with the described receptacle (20) that loops back, and another road is connected with described circulating tank (19) by particle circulation control valve (16); The described liquid outlet (23) that loops back on the receptacle is connected with described circulating tank (19) by water return pipeline (25); Described clear water supply channel (27) is provided with clear water water inlet control valve (9), and jetting control valve (10) is installed on the described jetting pipeline (28).
6. purging system according to claim 5 is characterized in that, flowmeter (2) is installed on the described main-supply road; First Pressure gauge (3) is installed on the described main-supply road; Second Pressure gauge (18) is installed on the described return line.
7. purging system according to claim 6 is characterized in that, water intaking valve (8) is installed on the main-supply road between described circulating pump and the described flowmeter.
8. purging system according to claim 7 is characterized in that, air intake control valve (14) is installed on the described air inlet pipeline (29); Be equipped with between described water sprayer (4) outlet and the described membrane module (7) and mix purge control valve (11).
9. purging system according to claim 8, it is characterized in that, described agitator (5) bottom and the described vertical range of holding back net (21) are 1cm, described agitator (5) is placed on the described receptacle (20) that loops back and departs from position intermediate a little, can control particle concentration and quantity by the size of rotating speed.
10. purging system according to claim 9, it is characterized in that, recycle control valve (17) and detection of particles valve (12) are installed on the described return line (24), and the return line between described recycle control valve (17) and the detection of particles control valve (12) is transparent pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013103060847A CN103341324A (en) | 2013-07-19 | 2013-07-19 | Cleaning method and cleaning system of tubular membrane |
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| CN2013103060847A CN103341324A (en) | 2013-07-19 | 2013-07-19 | Cleaning method and cleaning system of tubular membrane |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104437091A (en) * | 2014-12-31 | 2015-03-25 | 江苏天琦生物科技有限公司 | Membrane separation device |
| CN108499365A (en) * | 2018-03-26 | 2018-09-07 | 湖州科滤膜技术有限公司 | A kind of water purification miillpore filter pipe outer wall automatic cleaning apparatus |
| CN110180817A (en) * | 2019-05-29 | 2019-08-30 | 西安热工研究院有限公司 | The multiphase flow cleaning device and cleaning method of solid state electrode in a kind of chemical instruments |
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| CN203564972U (en) * | 2013-07-19 | 2014-04-30 | 天津工业大学 | Cleaning system of tubular membrane |
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| CN1533827A (en) * | 2003-03-27 | 2004-10-06 | 天津膜天膜工程技术有限公司 | System of using soft spberical particles to proceed membrane cleaning and its cleaning method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104437091A (en) * | 2014-12-31 | 2015-03-25 | 江苏天琦生物科技有限公司 | Membrane separation device |
| CN108499365A (en) * | 2018-03-26 | 2018-09-07 | 湖州科滤膜技术有限公司 | A kind of water purification miillpore filter pipe outer wall automatic cleaning apparatus |
| CN108499365B (en) * | 2018-03-26 | 2020-12-01 | 徐州云创物业服务有限公司 | Automatic cleaning device for outer wall of water purification microporous filter membrane pipe |
| CN110180817A (en) * | 2019-05-29 | 2019-08-30 | 西安热工研究院有限公司 | The multiphase flow cleaning device and cleaning method of solid state electrode in a kind of chemical instruments |
| CN110180817B (en) * | 2019-05-29 | 2023-09-08 | 西安热工研究院有限公司 | Multiphase flow cleaning device and cleaning method for solid-state electrode in chemical instrument |
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Application publication date: 20131009 |