CN103613168B - Method and system for recycling waste water by combining spark generation plasma with multistage membrane technology - Google Patents
Method and system for recycling waste water by combining spark generation plasma with multistage membrane technology Download PDFInfo
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- CN103613168B CN103613168B CN201310615254.XA CN201310615254A CN103613168B CN 103613168 B CN103613168 B CN 103613168B CN 201310615254 A CN201310615254 A CN 201310615254A CN 103613168 B CN103613168 B CN 103613168B
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Abstract
The invention discloses a method and a system for recycling waste water by combining a spark generation plasma with a multistage membrane technology. The method comprises the steps of 1) by taking a thyratron switching power supply and a needle plate type spark discharge plasma generator as a basis, modifying an ultrafiltration membrane and a reverse osmosis membrane by adopting spark discharge to generate plasma; 2) pretreating waste water in a plug flow reactor through activated carbon adsorption and a microfiltration membrane; 3) controlling the conductivity of to-be-treated waste water by controlling the feeding amount of organic loads, so as to ensure that waste water treatment is carried out under a spark discharge mode; 4) combining plasma, generated by pulse discharge by adopting a spark discharge plasma technology, with activated carbon and ultraviolet radiation to treat waste water; and 5) treating waste water by combining an ultrafiltration/reverse osmosis double-membrane technology with a plasma technology. According to the method and system, the turbidity removal rate of various printing and dyeing waste water can achieve more than 99%, the conductance removal rate can achieve more than 99%, the COD (Chemical Oxygen Demand) removal rate can achieve more than 97%, the BOD (Biochemical Oxygen Demand) removal rate can achieve more than 96%, and the membrane pollution degree can be minimized.
Description
Technical field
The present invention relates to waste water recycling method and system that spark-discharge plasma works in coordination with Using Multistage Membranes technology, belong to field of waste water treatment.
Background technology
Along with the fast development of dyestuffs industries, its factory effluent has become one of current topmost pollution source of water body, and its water quality presents high chroma, high density, high COD and BOD value.Dyeing waste water accounts for 30% of enterprise wastewater total release, once dyeing waste water enters the Waste Water Treatment of enterprise, water treatment effect will be made to reduce, and intractability and processing cost increase.
Reverse osmosis technology has the plurality of advantages such as low equipment investment, energy expenditure is low, the construction period is short, RO technology is utilized to carry out Treatment for Reuse to waste water of far-reaching significance as non-immediate drinking water source, and fouling membrane is the bottleneck of this technology widespread use of restriction all the time, lack the measure effectively reducing fouling membrane at present.
Using ozone process waste water is also that conventional one is selected, but at least also has two key issues to need to solve at present: one is that ozone energy consumption is higher, and productive rate is lower, and the cost of operation is increased; Two is that the solubleness of ozone in water is lower, is not utilized effectively and overflows.
Finally, single plasma technique, technology of biological membrane or high-level oxidation technology process range are limited, and comprehensive various technology not only needs to overcome above-mentioned various technical problem, also needs cross-cutting experience and knowledge.Therefore, the combined system still lacking a kind of coordination at present can make every discharge of wastewater index effectively reduce simultaneously.
Summary of the invention
In order to overcome the deficiencies in the prior art, the object of this invention is to provide waste water recycling method and system that spark-discharge plasma works in coordination with Using Multistage Membranes technology.
Spark-discharge plasma works in coordination with the waste water recycling method of Using Multistage Membranes technology,
1) adopt based on thyratron switch power supply and needle plate type spark-discharge plasma producer, adopt spark discharge to produce plasma body and modification is carried out to ultra-filtration membrane, reverse osmosis membrane;
2) in plug flow reactor, by charcoal absorption and microfiltration membrane, pre-treatment is carried out to waste water;
3) dosage by controlling organic loading controls pending useless electrical conductivity of water, ensures to carry out wastewater treatment under spark discharge pattern;
4) spark-discharge plasma technology is adopted to produce plasma body and gac, uv-radiation associated treatment waste water in impulsive discharge under bag Oxygen Condition ozoniferous of exposing to the sun;
5) the two membrane technique of ultrafiltration/reverse osmosis is utilized to work in coordination with plasma technology process waste water.
Further, EDTA 6) is regularly utilized to clean reverse osmosis membrane.
Preferably, described needle plate type spark-discharge plasma producer, electrion pin electrode comprises 16 hollow stainless steel needles, 0.8mm, outer ring is ellipticity, be uniformly distributed 12 pin electrodes, be spaced apart 20mm, inner ring is 4, spray point electrode is successively decreased to both sides by plate center, left and right is all symmetric up and down, and the ventilating pit stainless steel microtubule 1.0mm × 4.0mm at pin electrode place makes, plate electrode ground connection; The crest voltage 0-25KV of described impulsive discharge power supply, pulse-repetition 100-300Hz; The spacing of described pin electrode and plate electrode is 1.0-4.0cm.
Preferably, water outlet adopts intermittent operation mode, namely produces water 10 min, empty aeration 2 min.
Preferably, adopt three gallery plug-flow aeration tanks, to weaken the impact of waste water to Using Multistage Membranes, spiral advance under differential pressure action, makes waste water and film fully contact and then be effectively addressed.
Described waste water is dyeing waste water, and pH value is 4-10, and after the method described in application, turbidity removal rate is more than 99%, and conductance clearance is more than 99%, and COD clearance is more than 97%, and BOD clearance is more than 96%.
Spark-discharge plasma works in coordination with a waste water reuse system for Using Multistage Membranes technology, comprises needle plate type spark-discharge plasma producer, plasma modification multi-stage biofilm coordinated with plasma technology plug flow reactor, conductivity control system;
Described needle plate type spark-discharge plasma producer comprises electrion pin electrode, plate electrode, water jacket, thyratron switch high-voltage pulse power source, anemometer, air chamber, gas tank, microtubule, water coolant;
The ventilating pit at electrion pin electrode place is made by microtubule, is connected with air chamber, and gas tank is filled with bag oxygen ozoniferous, gas flows through air valve, anemometer, microtubule in turn, form bubble at the needle point of electrion pin electrode, plate electrode ground connection, passes into water coolant by water jacket;
Described plasma modification multi-stage biofilm coordinated with plasma technology plug flow reactor comprises hollow fiber microfiltration membrane assembly, fluid level controller, intake pump, PCL controller, ultra-filtration membrane, reverse osmosis membrane, PVC carrier, waste water enters reactor by intake pump by water inlet pipe, by fluid level controller controlling water level, and feed back to PCL controller; The polyvinylidene fluoride hollow fiber curtain microfiltration membrane pre-treatment of waste water first in hollow fiber microfiltration membrane assembly, by aeration tank continuous aeration, needle plate type spark-discharge plasma producer is utilized to expose to the sun into bag oxygen generation ozoniferous plasma body, simultaneously in spark discharge, gac in the UV-light radiated from plasma channel and device PVC carrier, with constantly expose to the sun into ozone forms that ozone/uv-radiation combines, ozone and the synergistic high-level oxidation technology of gac strengthen process to waste water; Going out under the effect of water pump negative pressure-pumping, waste water is successively through ultra-filtration membrane, reverse osmosis membrane;
Described conductivity control system comprises sampling tube, described PCL controller, described goes out water pump, conductivity meter, draws water sample, measured, feed back to PCL controller, monitor in addition simultaneously to the water outlet conductance going out water pump by conductivity meter by sampling tube timing.
Preferably, described aeration tank is three gallery plug-flow aeration tanks.
Preferably, described ultra-filtration membrane adopts PSF/SPSF; Described reverse osmosis membrane adopts CPA2-4040 composite polyamide.
Preferably, described needle plate type spark-discharge plasma producer, electrion pin electrode comprises 16 hollow stainless steel needles, 0.8mm, and outer ring is ellipticity, be uniformly distributed 12 pin electrodes, be spaced apart 20mm, inner ring is 4, and spray point electrode is successively decreased to both sides by plate center, left and right is all symmetric up and down, and the ventilating pit stainless steel microtubule 1.0mm × 4.0mm at pin electrode place makes.
The useful benefit that the present invention has, spark discharge is relied on to produce plasma body cooperative micro-filtration/ultrafiltration/reverse osmosis Using Multistage Membranes technology pollution degradation material, use membrane separation technique, plasma technique and high-level oxidation technology process waste water simultaneously, to the turbidity removal rate of all kinds of dyeing waste water more than 99%, conductance clearance is more than 99%, COD clearance is more than 97%, and BOD clearance more than 96%, and all reaches printing-dying wastewater recycling index.And fouling membrane degree is dropped to minimum, produce secondary pollution hardly, create good economic benefit and good environmental benefit.
Accompanying drawing explanation
Fig. 1 is the structural representation that spark-discharge plasma of the present invention works in coordination with the waste water reuse system of Using Multistage Membranes technology;
Fig. 2 is the structural representation of three gallery plug-flow aeration tank floor plan of the present invention;
Fig. 3 is the structural representation of electrion pin electrode of the present invention;
In figure, hollow fiber microfiltration membrane assembly 1, sampling tube 2, fluid level controller 3, intake pump 4, PCL controller 5, electrion pin electrode 6, plate electrode 7, water jacket 8, ultra-filtration membrane 9, reverse osmosis membrane 10, tensimeter 11, go out water pump 12, high-voltage pulse power source 13, under meter 14, gas blower 15, anemometer 16, air chamber 17, gas 18, microtubule 19, water coolant 20, PVC carrier 21.
Embodiment
As shown in Figure 1, spark-discharge plasma works in coordination with the waste water reuse system of Using Multistage Membranes technology, comprises needle plate type spark-discharge plasma producer, plasma modification multi-stage biofilm coordinated with plasma technology plug flow reactor, conductivity control system;
Described needle plate type spark-discharge plasma producer comprises electrion pin electrode 6, plate electrode 7, water jacket 8, thyratron switch high-voltage pulse power source 13, anemometer 16, air chamber 17, gas tank 18, microtubule 19, water coolant 20;
The ventilating pit at electrion pin electrode 6 place is made by microtubule 19, be connected with air chamber 17, gas tank 18 is filled with bag oxygen ozoniferous, gas flows through air valve, anemometer 16, microtubule 19 in turn, bubble is formed at the needle point of electrion pin electrode 6, plate electrode 7 ground connection, passes into water coolant 20 by water jacket 8;
Described plasma modification multi-stage biofilm coordinated with plasma technology plug flow reactor comprises hollow fiber microfiltration membrane assembly 1, fluid level controller 3, intake pump 4, PCL controller 5, ultra-filtration membrane 9, reverse osmosis membrane 10, tensimeter 11, PVC carrier 21, waste water enters reactor by intake pump 4 by water inlet pipe, by fluid level controller 3 controlling water level, and feed back to PCL controller 5; Waste water is first through hollow fiber microfiltration membrane assembly 1 pre-treatment, by aeration tank continuous aeration, waste water ecto-entad through film, trapped particles impurity and microorganism, reach the object of purification, decelerating membrane pollution, the duration of service extending film, guarantee reverse osmosis membrane system long-term stability are run simultaneously.
Needle plate type spark-discharge plasma producer is utilized to expose to the sun into bag oxygen generation ozoniferous plasma body, simultaneously in spark discharge, gac in the UV-light radiated from plasma channel and device PVC carrier 21, with constantly expose to the sun into ozone forms that ozone/uv-radiation combines, ozone and the synergistic high-level oxidation technology of gac strengthen process to waste water; Going out under the effect of water pump 12 negative pressure-pumping, waste water through ultra-filtration membrane 9, reverse osmosis membrane 10, makes waste water be purified successively, going out setting pressure table 11 near water pump 12, runs in declared working condition with control pump, guarantees the normal use of pump; Gac is placed in 4 spherical PVC carriers 21, can prevents gac from moving in pulling flow type reaction tank on a large scale, affect the normal operation of combined films and plasma generator.
Described conductivity control system comprises sampling tube 2, described PCL controller 5, described goes out water pump 12, conductivity meter, water sample is drawn by sampling tube 2 timing, measured by conductivity meter, feed back to PCL controller 5, the water outlet conductance going out water pump 12 is monitored in addition simultaneously.
Preferably, as shown in Figure 2, described aeration tank is three gallery plug-flow aeration tanks.Plasma modification multi-stage biofilm works in coordination with plasma technology plug flow reactor, adopt three gallery plug-flow aeration tank floor plan, to weaken the impact of waste water to Using Multistage Membranes, spiral advance under differential pressure action, makes waste water and film fully contact and is effectively addressed.
Preferably, described ultra-filtration membrane 9 adopts PSF/SPSF (SPSF), and ultra-filtration membrane 9 is pressed particle diameter and selected particulate in separation solution and macromole, effectively can reduce turbidity.Utilize plasma technique to carry out ultra-filtration membrane 9 surface processing the wetting ability can improving its surface, improve the resistance to crocking of ultra-filtration membrane simultaneously.
Described reverse osmosis membrane 10 adopts CPA2-4040 composite polyamide, can not only under low pressure effectively organics removal, reduce COD, and there is significant desalting effect.Modification can make that the flux of film improves, rejection rises, and can improve chlorine resistance and the resistance to crocking of film to utilize plasma technology to carry out reverse osmosis membrane, and improve reverse osmosis membrane permeability and selectivity, the adhesion of supporting layer and active coating is more solid simultaneously.Modified mould material more easily cleans, and resistance to crocking is greatly improved.
Preferably, as shown in Figure 3, described needle plate type spark-discharge plasma producer, electrion pin electrode comprises 16 hollow stainless steel needles (0.8mm), and outer ring is ellipticity, be uniformly distributed 12 pin electrodes, be spaced apart 20mm, inner ring is 4, and spray point electrode is successively decreased to both sides by plate center, left and right is all symmetric up and down, and the ventilating pit stainless steel microtubule 1.0mm × 4.0mm at pin electrode place makes.Layout to center centralization type contributes to obtaining higher pulse energy, makes spark discharge have higher energy efficiency, liquid phase O in discharge process simultaneously
3concentration reach 6.5mmol/L.
Spark-discharge plasma works in coordination with the waste water recycling method of Using Multistage Membranes technology,
1) adopt based on thyratron switch power supply and needle plate type spark-discharge plasma producer, adopt spark discharge to produce plasma body and modification is carried out to ultra-filtration membrane, reverse osmosis membrane;
2) in plug flow reactor, by charcoal absorption and microfiltration membrane, pre-treatment is carried out to waste water;
3) dosage by controlling organic loading controls pending useless electrical conductivity of water, ensures to carry out wastewater treatment under spark discharge pattern; Conductivity control system, for controlling the specific conductivity of spark discharge position, drawing water sample by sampling tube 2 timing, directly being measured, feed back to PCL controller 5 by conductivity meter, controlling influent load, to reduce the ion content in reaction unit.Monitor the water outlet conductance going out water pump 12 in addition simultaneously, guarantee that conductance clearance is more than 99%, when water quality is not up to standard, feed back in time, water aeration time ratio is produced in adjustment, to extend the treatment time.
4) spark-discharge plasma technology is adopted to produce plasma body and gac, uv-radiation associated treatment waste water in impulsive discharge under bag Oxygen Condition ozoniferous of exposing to the sun;
5) the two membrane technique of ultrafiltration/reverse osmosis is utilized to work in coordination with plasma technology process waste water.
Further, EDTA 6) is regularly utilized to clean reverse osmosis membrane.
Preferably, described needle plate type spark-discharge plasma producer, electrion pin electrode comprises 16 hollow stainless steel needles, 0.8mm, outer ring is ellipticity, be uniformly distributed 12 pin electrodes, be spaced apart 20mm, inner ring is 4, spray point electrode is successively decreased to both sides by plate center, left and right is all symmetric up and down, and the ventilating pit stainless steel microtubule 1.0mm × 4.0mm at pin electrode place makes, plate electrode ground connection; The crest voltage 0-25KV of described impulsive discharge power supply, pulse-repetition 100-300Hz; The spacing of described pin electrode and plate electrode is 1.0-4.0cm.
Preferably, water outlet adopts intermittent operation mode, namely produces water 10 min, empty aeration 2 min.Going out under the effect of water pump 12 negative pressure-pumping, waste water ecto-entad is successively through micro-filtration/ultrafiltration/reverse osmosis, and graininess impurity and microorganism are retained in contrive equipment, thus reaches the object of purification of waste water and reuse.
Preferably, adopt three gallery plug-flow aeration tanks, to weaken the impact of waste water to Using Multistage Membranes, spiral advance under differential pressure action, makes waste water and film fully contact and then be effectively addressed.
Described waste water is dyeing waste water, and pH value is 4-10, and after the method described in application, turbidity removal rate is more than 99%, and conductance clearance is more than 99%, and COD clearance is more than 97%, and BOD clearance is more than 96%.
Below by example, the unusual effect of the present invention in controlling diaphragm pollution is described.
embodiment 1
(1) producing water with reverse osmosis membrane is former water, under the pressure of 15Mpa, run 24h.Record unit pressure, unit surface, water outlet in the unit time characterize flux J.
(2) before wastewater treatment operations, initial flux J is measured
0.
(3) standard flux J/J is used
0the degree characterization of membrane pollution level declined.
The flux depression per-cent that observation experiment records, find that the ultra-filtration membrane membrane flux after Wastewater Pretreatment, plasma modification changes hardly, the flux depression per-cent of reverse osmosis membrane is about 8%, therefore the present invention reduces fouling membrane well.
Below by the optimal conditions of example in detail process of the present invention.
embodiment 2
1) adopt based on thyratron switch power supply and pin-plate reactor, adopt spark discharge to produce plasma body;
2) crest voltage of regulating impulse power supply is 15KV, and pulse-repetition is 100Hz;
3) height of plate electrode is adjusted, pin electrode and plate electrode distance is made to be 1.0cm, weak acid brilliant blue simulated wastewater is entered plasma modification multi-stage biofilm by intake pump by water inlet pipe works in coordination with in plasma technology plug flow reactor, by the water level in fluid level controller control device, the pH value regulating stimulated dye wastewater is 4;
4) with needle plate type spark-discharge plasma producer produce plasma body to ultra-filtration membrane, reverse osmosis membrane modification, measure the contact angle on flux depression degree and film surface;
5) charcoal absorption in the ball type carrier in device and hollow fiber microfiltration membrane is utilized to carry out pre-treatment to weak acid brilliant blue simulated wastewater;
6) needle plate type spark-discharge plasma producer is utilized to expose to the sun into bag oxygen generation ozoniferous plasma body, simultaneously in spark discharge, radiate the gac in stronger UV-light and device PVC carrier from plasma channel, with constantly expose to the sun into ozone forms that ozone/uv-radiation combines, ozone and the synergistic high-level oxidation technology of gac strengthen process to waste water;
7) utilize the two membrane technique of ultrafiltration/reverse osmosis to work in coordination with plasma technology advanced treatment used water difficult to degradate simultaneously;
8) intermittent operation go out the effect of water pump negative pressure-pumping under, obtain reuse waste water, sampling record delivery turbidity, COD value, BOD value.
embodiment 3
Other conditions are constant, change the crest voltage 15KV of the pulse power in the step (2) in embodiment 2 into 20KV.
embodiment 4
Other conditions are constant, change the crest voltage 15KV of the pulse power in the step (2) in embodiment 2 into 25KV.
embodiment 5
Other conditions are constant, change the pulse-repetition 100Hz of the pulse power in the step (2) in embodiment 2 into 200Hz.
embodiment 6
Other conditions are constant, change the pulse-repetition 100Hz of the pulse power in the step (2) in embodiment 2 into 300Hz.
embodiment 7
Other conditions are constant, change the pin electrode of 1.0cm in step (3) in embodiment 2 and the spacing of plate electrode into 2.0cm.
embodiment 8
Other conditions are constant, change the pin electrode of 1.0cm in step (3) in embodiment 2 and the spacing of plate electrode into 3.0cm.
embodiment 9
Other conditions are constant, change the pin electrode of 1.0cm in step (3) in embodiment 2 and the spacing of plate electrode into 4.0cm.
embodiment 10
Other conditions are constant, change the pH value 4 of the stimulated dye wastewater in step (3) in embodiment 2 into 7.
embodiment 11
Other conditions are constant, change the pH value 4 of the stimulated dye wastewater in step (3) in embodiment 2 into 10.
Confirm that pollution substance in dyeing waste water to work in coordination with in the wastewater recycling device of Using Multistage Membranes technology top condition of degrading at spark-discharge plasma of the present invention by example: the pulsed voltage of the thyratron switch pulse power is 25KV, pulse-repetition is 200Hz, the optimum distance of pin electrode and plate electrode is 1cm, and the optimal ph of stimulated dye wastewater is 10.
principle of the present invention
1) adopt based on thyratron switch power supply and pin-plate reactor, adopt spark discharge to produce plasma body and modification is carried out to ultra-filtration membrane, reverse osmosis membrane; (2) in plug flow reactor, by charcoal absorption and microfiltration membrane, pre-treatment is carried out to dyeing waste water; (3) dosage by controlling organic loading controls pending useless electrical conductivity of water, ensures to carry out wastewater treatment under spark discharge pattern; (4) spark-discharge plasma technology is adopted to produce plasma body and gac associated treatment used water difficult to degradate in impulsive discharge under bag Oxygen Condition ozoniferous of exposing to the sun; (5) the two membrane technique of ultrafiltration/reverse osmosis is utilized to work in coordination with plasma technology advanced treatment used water difficult to degradate; (6) regularly add EDTA and clean reverse osmosis membrane.
Comprise needle plate type spark-discharge plasma producer, plasma modification multi-stage biofilm works in coordination with plasma technology plug flow reactor, conductivity control system; Needle plate type spark-discharge plasma producer has three aspect effects, and (1) carries out process with plasma technique to ultrafiltration membrane surface can make film surface contact angle significantly reduce, thus improves the wetting ability on its surface, improves the resistance to crocking of ultra-filtration membrane simultaneously; (2) modification can make that the flux of film improves, rejection rises to utilize Surface Treatment with Plasma technology to carry out reverse osmosis membrane, and chlorine resistance and the resistance to crocking of film can be improved, improve reverse osmosis membrane permeability and selectivity, the adhesion of supporting layer and active coating is more solid simultaneously; (3) plasma body is produced by the spark discharge bag oxygen ozoniferous that exposes to the sun, simultaneously in spark discharge, radiate the gac in stronger UV-light and device from radiation paths, with constantly expose to the sun into ozone forms that ozone/uv-radiation combines, ozone and the synergistic high-level oxidation technology of gac strengthen process to waste water.
Needle plate type spark-discharge plasma producer adopts spininess plate electrode structure, spray point electrode is successively decreased to both sides by plate center, left and right is all symmetric up and down, layout to center centralization type contributes to obtaining higher pulse energy, makes spark discharge have higher energy efficiency, discharge process liquid phase O simultaneously
3concentration reach 6.5mmol/L, adopt indigo blue sodium spectrophotometry to record.
Higher for ozone energy consumption in using ozone high-level oxidation technology, productive rate is lower, the problem that the solubleness of ozone in water is low, and the present invention is exposed to the sun into comprising the oxygen of a small amount of ozone as plasma body by spark pulse discharge technology, the consumption of ozone can be greatly reduced, improve energy utilization rate.In addition by the impulsive discharge under oxygen existent condition, not only produce a large amount of OH degradation of contaminant, and produce such as ozone, superoxide (O
2 -) and singlet oxygen (
1o
2) isoreactivity material participates in reaction, although the ozone that oxygen constantly produces with constantly to expose to the sun into ozone concentration large not, but by chance meet the feature that ozone solubleness in water is low, ozone is made to participate in high-level oxidation technology process endlessly, the ozone newly entered in reaction unit also can well be dissolved in water, greatly can save ozone, reduce ozone to the pollution of air simultaneously.
Reverse osmosis technology has the plurality of advantages such as low equipment investment, energy expenditure is low, the construction period is short.Working cost due to fouling membrane increase constrains this technology and popularizes.The present invention farthest reduces fouling membrane by Wastewater Pretreatment, plasma modification, Membrane cleaning, makes this wastewater recycling device have more application prospect.
Utilize plasma technique to carry out ultrafiltration membrane surface processing the wetting ability can improving its surface, improve the resistance to crocking of ultra-filtration membrane simultaneously; Modification can make that the flux of film improves, rejection rises, and can improve chlorine resistance and the resistance to crocking of film to utilize plasma technology to carry out reverse osmosis membrane, and improve reverse osmosis membrane permeability and selectivity, the adhesion of supporting layer and active coating is more solid simultaneously.Modified mould material more easily cleans, and resistance to crocking is greatly improved.Because plasma surface treatment is a kind of dry process, eliminate the operations such as oven dry indispensable in wet chemical process technique, wastewater treatment, possess province's energy, the advantage such as nuisanceless.
Adopt immersed microfiltration film as reverse osmosis technology pretreatment technology, hollow fiber film assembly is immersed in membrane filtration groove, by plug-flow aeration tank continuous aeration, waste water ecto-entad is through film, trapped particles impurity and microorganism, reach the object of purification, decelerating membrane pollution, the duration of service extending film, guarantee reverse osmosis membrane system long-term stability are run simultaneously.
The ultra-filtration membrane adopting PSF/SPSF (SPSF) to make, by the particulate in particle diameter selection separation solution and macromole, can reduce turbidity effectively.CPA2-4040 composite polyamide reverse osmosis membrane can not only under low pressure effectively organics removal, reduce COD, and there is significant desalting effect.
Adopt the dissolved organic matter matter in the water inlet of granulated active carbon Adsorption, ensure RO membrane permeability energy and produce water water quality.Exposing to the sun, impulsive discharge under bag Oxygen Condition ozoniferous produces plasma body (O
3) the ultraviolet cooperating process used water difficult to degradate that produces with gac, spark discharge, Be very effective.
The spark discharge pattern that emmission spectrum interval is formed when 400 ~ 500nm has higher single pulse energy, energy transfer efficiency and energy utilization efficiency, relative to other discharge modes, spark discharge can produce the plasma channel of higher temperature and stronger UV-light, improves degradation effect to produce more hydroxyl radical free radical.
Utilize plasma technology modified membrane, the performance of the various excellence of modified surface can be given, and the very thin thickness of modified layer (a few nanometer is to hundreds of nanometer); Make the bulk property of matrix constant; Do not produce a large amount of byproduct and dyestuff, non-environmental-pollution.
Plasma technique coordinates Using Multistage Membranes separation that the organic concentration of dyeing waste water is reduced, C/N is reduced, contribute to reducing film thickness, prevent microbial film blocked up and increase the outer field resistance to mass transfer of microbial film, substrate is hindered to enter microbial film internal layer, thus control the content of bacterial digestion, prevent aerobic heterotrophic bacterium amount reproduction from increasing biomembranous thickness.
The fouling membrane that calcium ion in waste water causes is the most serious, therefore regularly adds EDTA, permutoid reaction occurs and makes pollution layer become loose, and then wash pollutent under the effect of flow shear, weaken the pollution to reverse osmosis membrane.
Claims (10)
1. a spark-discharge plasma works in coordination with the waste water reuse system of Using Multistage Membranes technology, it is characterized in that, it comprises needle plate type spark-discharge plasma producer, plasma modification multi-stage biofilm coordinated with plasma technology plug flow reactor, conductivity control system;
Described needle plate type spark-discharge plasma producer comprises electrion pin electrode (6), plate electrode (7), water jacket (8), thyratron switch high-voltage pulse power source (13), anemometer (16), air chamber (17), gas tank (18), microtubule (19), water coolant (20);
The ventilating pit at electrion pin electrode (6) place is made by microtubule (19), be connected with air chamber (17), gas tank (18) is filled with bag oxygen ozoniferous, gas flows through air valve, anemometer (16), microtubule (19) in turn, bubble is formed at the needle point of electrion pin electrode (6), plate electrode (7) ground connection, passes into water coolant (20) by water jacket (8);
Described plasma modification multi-stage biofilm coordinated with plasma technology plug flow reactor comprises hollow fiber microfiltration membrane assembly (1), fluid level controller (3), intake pump (4), PCL controller (5), ultra-filtration membrane (9), reverse osmosis membrane (10), PVC carrier (21), waste water enters reactor by intake pump (4) by water inlet pipe, by fluid level controller (3) controlling water level, and feed back to PCL controller (5); The polyvinylidene fluoride hollow fiber curtain microfiltration membrane pre-treatment of waste water first in hollow fiber microfiltration membrane assembly (1), by aeration tank continuous aeration, needle plate type spark-discharge plasma producer is utilized to expose to the sun into bag oxygen generation ozoniferous plasma body, simultaneously in spark discharge, gac in the UV-light radiated from plasma channel and device PVC carrier (21), with constantly expose to the sun into ozone forms that ozone/uv-radiation combines, ozone and the synergistic high-level oxidation technology of gac strengthen process to waste water; Going out under water pump (12) negative pressure-pumping effect, waste water is successively through ultra-filtration membrane (9), reverse osmosis membrane (10);
Described conductivity control system comprises sampling tube (2), described PCL controller (5), described goes out water pump (12), conductivity meter, water sample is drawn by sampling tube (2) timing, measured by conductivity meter, feed back to PCL controller (5), the water outlet conductance going out water pump (12) is monitored in addition simultaneously.
2. system according to claim 1, is characterized in that, described aeration tank is three gallery plug-flow aeration tanks.
3. system according to claim 1, is characterized in that, described ultra-filtration membrane (9) adopts PSF/SPSF; Described reverse osmosis membrane (10) adopts CPA2-4040 composite polyamide.
4. system according to claim 1, it is characterized in that, described needle plate type spark-discharge plasma producer, electrion pin electrode (6) comprises 16 hollow stainless steel needles, 0.8mm, outer ring is ellipticity, is uniformly distributed 12 pin electrodes, is spaced apart 20mm, inner ring is 4, spray point electrode is successively decreased to both sides by plate center, and left and right is all symmetric up and down, and the ventilating pit stainless steel microtubule 1.0mm × 4.0mm at pin electrode place makes.
5. adopt a waste water recycling method for waste water reuse system as claimed in claim 1, it is characterized in that,
1) adopt based on thyratron switch power supply and needle plate type spark-discharge plasma producer, adopt spark discharge to produce plasma body and modification is carried out to ultra-filtration membrane, reverse osmosis membrane;
2) in plug flow reactor, by charcoal absorption and microfiltration membrane, pre-treatment is carried out to waste water;
3) dosage by controlling organic loading controls pending useless electrical conductivity of water, ensures to carry out wastewater treatment under spark discharge pattern;
4) spark-discharge plasma technology is adopted to produce plasma body and gac, uv-radiation associated treatment waste water in impulsive discharge under bag Oxygen Condition ozoniferous of exposing to the sun;
5) the two membrane technique of ultrafiltration/reverse osmosis is utilized to work in coordination with plasma technology process waste water.
6. method according to claim 5, is characterized in that, further, 6) regularly utilize EDTA to clean reverse osmosis membrane.
7. method according to claim 5, is characterized in that, described needle plate type spark-discharge plasma producer, electrion pin electrode comprises 16 hollow stainless steel needles, 0.8mm, outer ring is ellipticity, is uniformly distributed 12 pin electrodes, be spaced apart 20mm, inner ring is 4, and spray point electrode is successively decreased to both sides by plate center, and left and right is all symmetric up and down, the ventilating pit stainless steel microtubule 1.0mm × 4.0mm at pin electrode place makes, plate electrode ground connection; The crest voltage 0-25KV of described impulsive discharge power supply, pulse-repetition 100-300Hz; The spacing of described pin electrode and plate electrode is 1.0-4.0cm.
8. method according to claim 5, is characterized in that, water outlet adopts intermittent operation mode, namely produces water 10 min, empty aeration 2 min.
9. method according to claim 5, is characterized in that, adopts three gallery plug-flow aeration tanks, and to weaken the impact of waste water to Using Multistage Membranes, spiral advance under differential pressure action, makes waste water and film fully contact and then be effectively addressed.
10. method according to claim 5, is characterized in that, described waste water is dyeing waste water, pH value is 4-10, and after the method described in application, turbidity removal rate is more than 99%, conductance clearance is more than 99%, and COD clearance is more than 97%, and BOD clearance is more than 96%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN104310678B (en) * | 2014-10-17 | 2016-01-20 | 南京大学 | A kind of continous way catalyze plasma water pollutions refining plant |
| CN105110566B (en) * | 2015-09-11 | 2018-02-27 | 江苏大学 | A kind of low-contamination type membrane separation device based on lower temperature plasma technology |
| CN105347553B (en) * | 2015-11-17 | 2018-07-13 | 南京麦得文环保科技有限公司 | A kind of LED industry chip production waste water treatment system and processing method |
| CN112880968B (en) * | 2021-01-15 | 2022-11-01 | 哈尔滨工程大学 | Experimental device for research on multi-spark bubbles in shear flow |
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| CN103145284B (en) * | 2013-01-24 | 2014-11-05 | 南京大学 | Multi-functional water purifier integrated with activated carbon and low-temperature plasma |
| CN203625089U (en) * | 2013-11-28 | 2014-06-04 | 南通大学 | Wastewater recycling system of spark discharge plasma synergistic multi-level membrane technology |
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