CN112679008A - Reverse osmosis concentrated water multi-stage combined technology treatment device and treatment method - Google Patents

Reverse osmosis concentrated water multi-stage combined technology treatment device and treatment method Download PDF

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CN112679008A
CN112679008A CN202011467693.7A CN202011467693A CN112679008A CN 112679008 A CN112679008 A CN 112679008A CN 202011467693 A CN202011467693 A CN 202011467693A CN 112679008 A CN112679008 A CN 112679008A
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water
cavitation
reverse osmosis
osmosis concentrated
oxidation
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张博
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Jiangsu Zhuobo Environmental Protection Technology Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

Abstract

The invention relates to a reverse osmosis concentrated water multi-stage combined technology treatment device and a treatment method, aiming at the characteristic that reverse osmosis concentrated water has high COD, firstly, a first-stage oxidation treatment is carried out through a cavitation reaction system, then, a second-stage oxidation treatment is carried out through an ozone catalytic oxidation system, and then, a third-stage oxidation treatment is carried out through an electrolytic ultrasonic reaction system, so that organic pollutants are degraded, and the COD value is reduced; finally, the COD value is further reduced by filtering through a membrane filtering system, and suspended matters are filtered; thereby reducing the COD value of the reverse osmosis concentrated water from 100-500 mg/L to 10-50 mg/L, and the removal rate of COD reaches 80-95%; the content of suspended matters is reduced from 10-150 mg/L to less than or equal to 0.1mg/L, and the removal rate of the suspended matters is more than or equal to 99 percent; achieving the purpose of standard discharge or pretreatment for membrane system desalination and recycling.

Description

Reverse osmosis concentrated water multi-stage combined technology treatment device and treatment method
Technical Field
The invention relates to a reverse osmosis concentrated water multi-stage combined technology treatment device and a treatment method, belonging to the technical field of industrial wastewater treatment.
Background
With the continuous application of reverse osmosis technology in the water treatment industry, a large amount of reverse osmosis concentrated water is generated, the concentration of TDS (total dissolved solids) is high, the concentration of organic pollutants in the water is greatly increased in the concentration process, the COD (chemical oxygen demand) value of the general reverse osmosis concentrated water far exceeds the discharge standard, and the COD of the reverse osmosis concentrated water is difficult to treat; especially when the discharge index has a limit to the salt content, the high-pressure reverse osmosis membrane technology is used for desalting and recycling, and the high-pressure reverse osmosis membrane system has higher requirement on removing the COD value. At present, Chemical Oxygen Demand (COD) value is reduced mainly by methods of dosing precipitation, Fenton, ozone catalytic oxidation and the like; for example, 201620776695.7A reverse osmosis concentrated water treatment system comprises a sedimentation tank and an ozone catalytic oxidation device, wherein the ozone catalytic oxidation device comprises a centrifugal pump, a high-efficiency gas-liquid mixer, an ozone reactor, an ozone generator and a hydrogen peroxide adding device, and the reverse osmosis concentrated water is subjected to catalytic oxidation by adding hydrogen peroxide and ozone; 201910124195.3A method for treating organic pollutants in reverse osmosis concentrated water by microwave-electrocatalysis combined process, which comprises a microwave unit, an electrocatalysis oxidation unit and an ultrafiltration unit. The device and the method have certain effect on reducing the COD value of the reverse osmosis concentrated water with lower concentration, but a device and a method for treating the reverse osmosis concentrated water with high COD by adopting a multi-stage combined technology are further needed.
Disclosure of Invention
The invention provides a multi-stage combined technical treatment device and a treatment method for reverse osmosis concentrated water, aiming at carrying out advanced treatment on the reverse osmosis concentrated water aiming at the characteristic of high COD of the reverse osmosis concentrated water, and discharging the reverse osmosis concentrated water up to the standard or carrying out pretreatment for recycling. Aiming at the reverse osmosis concentrated water, the COD value is reduced by sequentially utilizing cavitation reaction, ozone catalytic oxidation and electrolytic ultrasonic reaction to carry out three-stage oxidation, and finally, the COD value is further reduced by utilizing membrane filtration, and suspended matters are filtered. Before treatment, the COD value of reverse osmosis concentrated water is 100-500 mg/L, the content of suspended matters is 10-150 mg/L, water flow passes through a cavitation device through a cavitation reaction system to generate pressure drop, so that the local pressure is smaller than the saturated steam pressure at the corresponding temperature, bubbles are generated to be instantly collapsed, local high temperature and high pressure are generated in a very small cavitation range, hydroxyl bonds in water are broken to form radicals such as H (hydrogen radical) and OH (hydroxyl radical), organic pollutants are oxidized by cavitation to degrade COD, the COD value of water discharged from the cavitation reaction system is reduced to 70-350 mg/L, and the removal rate of the COD is about 20-40%. Further passing through an ozone catalytic oxidation system to oxidize O3(ozone) and H2O2(hydrogen peroxide) composition of 2O3And 1H2O2Can generate 2. OH and 3O2(oxygen molecule) therebyThe strong oxidizing property of OH is utilized to finally degrade organic matters into CO2(carbon dioxide) and H2O (water) and other minerals, no secondary pollution, O3And H2O2The combined oxidation process is 2-200 times faster than the single oxidation process; the COD value of the effluent of the ozone catalytic oxidation system is reduced to 35-175 mg/L, and the removal rate of COD is about 40-60%. Then an electrolytic ultrasonic reaction system is used, high-energy ultrasonic waves of 15-25 kHz are utilized to form ultrasonic cavitation, cavitation bubbles are broken to generate high temperature larger than or equal to 5000K instantly, water molecules are decomposed into OH and O (hyperoxyl), and the organic pollutants are degraded through strong oxidation; meanwhile, under the synergistic effect of electrolysis and ultrasound, the organic matters are degraded by direct electrolytic oxidation (OH generation) and indirect electrolytic oxidation (sodium hypochlorite formation), the COD value of the effluent of the electrolytic ultrasonic reaction system is reduced to 17.5-87.5 mg/L, and the removal rate of the COD is about 40-60%. And finally, a membrane filtration system is adopted, wherein the PVDF hollow fiber membrane with the aperture of 0.03-0.05 mu m is selected as the membrane filtration system, the membrane filtration system has permanent hydrophilicity and excellent long-term pollution resistance, the stable filtration performance of the ultrafiltration membrane is ensured, the COD value of the effluent of the membrane filtration system is reduced to 10-50 mg/L, the removal rate of COD is 31-43%, the content of suspended matters is reduced to be less than or equal to 0.1mg/L, and the removal rate of the suspended matters is greater than or equal to 99%. The advanced treatment of the reverse osmosis concentrated water by utilizing the reverse osmosis concentrated water multistage combined technology treatment device achieves the purpose of standard discharge or pretreatment for membrane system desalination and reuse.
The technical solution of the invention is as follows: the reverse osmosis concentrated water multistage combined technology treatment device structurally comprises a cavitation reaction system, an ozone catalytic oxidation system, an electrolytic ultrasonic reaction system and a membrane filtration system. Wherein, the reverse osmosis concentrated water is firstly oxidized in the first stage by the cavitation reaction system to send out cavitation reaction effluent, then oxidized in the second stage by the ozone catalytic oxidation system to send out catalytic oxidation effluent, and then oxidized in the third stage by the electrolytic ultrasonic reaction system to degrade organic pollutants, reduce COD value and send out electrolytic ultrasonic reaction effluent, and finally filtered by the membrane filtration system to further reduce COD value, and filtered suspended matters are sent out to be treated as effluent; and a mud outlet of the membrane filtration system MFS sends out mud cakes. The COD value of the reverse osmosis concentrated water is reduced to 10-50 mg/L from 100-500 mg/L through the reverse osmosis concentrated water combination device, and the removal rate of the COD reaches 80-95%; the content of suspended matters is reduced from 10-150 mg/L to less than or equal to 0.1mg/L, and the removal rate of the suspended matters is more than or equal to 99 percent. The advanced treatment of the reverse osmosis concentrated water by using the reverse osmosis concentrated water combination device achieves the purpose of standard discharge or pretreatment for desalination and recycling by entering a membrane system.
The multi-stage combined technology treatment method of reverse osmosis concentrated water comprises the following steps:
1) performing primary oxidation through a cavitation reaction system, and reducing the COD value of the reverse osmosis concentrated water from 100-500 mg/L to 70-350 mg/L;
2) performing secondary oxidation through an ozone catalytic oxidation system, and reducing the COD value of the cavitation reaction effluent from 70-350 mg/L to 35-175 mg/L;
3) carrying out three-stage oxidation through an electrolytic ultrasonic reaction system to reduce the COD value of the ozone catalytic oxidation effluent from 35-175 mg/L to 17.5-87.5 mg/L;
4) through a membrane filtration system, the COD value of the water produced by the electrolytic ultrasonic reaction is reduced from 17.5-87.5 mg/L to 10-50 mg/L, and the content of suspended matters is reduced from 10-150 mg/L to less than or equal to 0.1 mg/L.
Aiming at the characteristic that reverse osmosis concentrated water has high COD, the device and the method for treating reverse osmosis concentrated water by the multi-stage combined technology firstly carry out primary oxidation treatment by a cavitation reaction system, then carry out secondary oxidation treatment by an ozone catalytic oxidation system, and then carry out tertiary oxidation treatment by an electrolytic ultrasonic reaction system, so as to degrade organic pollutants and reduce the COD value; finally, the COD value is further reduced by filtering through a membrane filtering system, and suspended matters are filtered; thereby reducing the COD value of the reverse osmosis concentrated water from 100-500 mg/L to 10-50 mg/L, and the removal rate of COD reaches 80-95%; the content of suspended matters is reduced from 10-150 mg/L to less than or equal to 0.1mg/L, and the removal rate of the suspended matters is more than or equal to 99 percent; achieving the purpose of standard discharge or pretreatment for membrane system desalination and recycling.
Drawings
FIG. 1 is a schematic structural diagram of a reverse osmosis concentrated water multi-stage combined technology treatment device
In the drawing, CW represents reverse osmosis concentrated water, SC represents a mud cake, TW represents treated effluent, CRW represents cavitation reaction effluent, OCW represents ozone catalytic oxidation effluent, ESW represents electrolysis ultrasonic reaction effluent, CRS represents a cavitation reaction system, OCRS represents an ozone catalytic oxidation system, ESRS represents an electrolysis ultrasonic reaction system, and MFS represents a membrane filtration system.
FIG. 2 is a schematic structural diagram of a cavitation reaction system and an ozone catalytic oxidation system of a reverse osmosis concentrated water multi-stage combined technology treatment device.
CRS in the figure represents cavitation reaction system, OCRS represents ozone catalytic oxidation system, CW represents reverse osmosis concentrated water, CRW represents cavitation reaction outlet water, OCW represents catalytic oxidation outlet water, BT represents reverse osmosis concentrated water tank, CRT represents cavitation reaction tank, CR represents cavitation device, H represents hydrogen2O2Indicates hydrogen peroxide adding device, OCRT indicates ozone catalytic reaction box, VT indicates Venturi injection device, O3G represents an ozone generator, P21Denotes a lift pump, P22Indicating cavitation pumps, P23Showing an ozone injection pump.
FIG. 3 is a schematic structural diagram of an electrolytic ultrasonic reaction system and a membrane filtration system of a reverse osmosis concentrated water multi-stage combined technology treatment device.
In the drawing, ESRS denotes an electrolytic ultrasonic reaction system, MFS denotes a membrane filtration system, OCW denotes catalytic oxidation effluent, SC denotes a sludge cake, ESW denotes electrolytic ultrasonic reaction effluent, TW denotes treated effluent, EC denotes an electrochemical device, ESRT denotes an electrolytic ultrasonic reaction tank, SA denotes an ultrasonic wave generating device, MT denotes an intermediate water tank, UF denotes an ultrafiltration device, ST denotes a sludge tank, PF denotes a plate-and-frame filter press, WT denotes a water outlet tank, and P denotes31Showing a booster pump, P32Screw pump for sludge33Indicating an ultrafiltration backwash pump, P34A water pump is shown.
FIG. 4 is a process flow diagram of an embodiment of a reverse osmosis concentrated water multi-stage combined technology treatment device.
Detailed Description
Referring to the attached figure 1, the reverse osmosis concentrated water multi-stage combined technology treatment device structurally comprises a cavitation reaction system CRS, an ozone catalytic oxidation system OCRS, an electrolytic ultrasonic reaction system ESRS and a membrane filtration system MFS. The reverse osmosis concentrated water CW is subjected to primary oxidation through a cavitation reaction system CRS to send out cavitation reaction effluent CRW, then is subjected to secondary oxidation through an ozone catalytic oxidation system OCRS to send out ozone catalytic oxidation effluent OCW, and is subjected to tertiary oxidation degradation of organic pollutants through an electrolytic ultrasonic reaction system ESRS, the COD value is reduced, the electrolytic ultrasonic reaction effluent ESW is sent out, and finally, the COD value is further reduced through filtration of a membrane filtration system MFS, suspended matters are filtered, and treated effluent TW is sent out; and a mud outlet of the membrane filtration system MFS sends out mud cakes SC. The COD value of the reverse osmosis concentrated water is reduced to 10-50 mg/L from 100-500 mg/L through the reverse osmosis concentrated water combination device, and the removal rate of the COD reaches 80-95%; the content of suspended matters is reduced from 10-150 mg/L to less than or equal to 0.1mg/L, and the removal rate of the suspended matters is more than or equal to 99 percent. The advanced treatment of the reverse osmosis concentrated water by using the reverse osmosis concentrated water combination device achieves the purpose of standard discharge or pretreatment for membrane system desalination and reuse.
Referring to the attached figure 2, the cavitation system CRS structurally comprises a reverse osmosis concentrated water tank BT, a cavitation reaction tank CRT, a cavitation device CR and a lift pump P21Cavitation pump P22. Wherein the reverse osmosis concentrated water CW is connected to the water inlet of the reverse osmosis concentrated water tank BT, and the 1# water outlet of the reverse osmosis concentrated water tank BT passes through the lift pump P21Is connected to the No. 1 water inlet of a CRT of the cavitation reaction tank, and the No. 2 water outlet of a BT reverse osmosis concentrated water tank passes through a cavitation pump P22The cavitation device CR is connected to a No. 2 water inlet of the cavitation reaction pool CRT, and a water outlet of the cavitation reaction pool CRT sends out cavitation reaction effluent CRW; the first-stage oxidation is carried out through a cavitation reaction system, so that water flow quickly passes through a cavitation device to generate pressure drop, the local pressure is smaller than the saturated steam pressure at the corresponding temperature, bubbles are instantly collapsed, local high temperature and high pressure are generated in a very small cavitation range, hydroxyl bonds in water are broken to form radicals such as H (hydrogen radical) and OH (hydroxyl radical), organic pollutants are oxidized by cavitation to degrade COD, the COD value of reverse osmosis concentrated water is reduced to 70-350 mg/L from 100-500 mg/L, and the removal rate of the COD is 20-40%.
The ozone catalytic oxidation system OCRS structurally comprises a hydrogen peroxide feeding device H2O2Ozone catalytic reaction boxOCRT, Venturi injection device VT, ozone generator O3G. Ozone injection pump P23. Wherein the cavitation reaction effluent CRW is connected to the water inlet of the ozone catalytic reaction box OCRT, and the cavitation reaction effluent CRW also passes through the ozone injection pump P23An ozone generator O connected to the water inlet of the Venturi injection device VT3The gas outlet of G is connected with the gas inlet of a Venturi injection device VT, the water outlet of the Venturi injection device VT is connected to the ozone solution inlet of an ozone catalytic reaction box OCRT, and a hydrogen peroxide feeding device H2O2The medicine outlet of the ozone catalytic reaction box is connected with the medicine inlet of the ozone catalytic reaction box OCRT, and the water outlet of the ozone catalytic reaction box OCRT sends out ozone catalytic oxidation effluent OCW; performing secondary oxidation to obtain O by an ozone catalytic oxidation system3(ozone) and H2O2(hydrogen peroxide) composition of 2O3And 1H2O2Can generate 2. OH and 3O2(oxygen molecule) to finally degrade organic matter into CO by the strong oxidizing property of OH2(carbon dioxide) and H2O (water) and other minerals, no secondary pollution, O3And H2O2The combined oxidation process is 2-200 times faster than the single oxidation process; the COD value of the cavitation reaction effluent is reduced from 70-350 mg/L to 35-175 mg/L, and the removal rate of the COD is about 40-60%.
Referring to fig. 3, the structure of the electrolytic ultrasonic reaction system ESRS includes an electrochemical device EC, an electrolytic ultrasonic reaction cell ESRT, and an ultrasonic wave generation device SA. Wherein the ozone catalytic oxidation effluent OCW is connected to the water inlet of the ESRT, the electrochemical device EC is connected with the electrode of the ESRT, the ultrasonic wave generating device SA is connected with the ultrasonic substrate of the ESRT, and the water outlet of the ESRT is used for sending out the ESW; carrying out three-stage oxidation by an electrolytic ultrasonic reaction system, forming ultrasonic cavitation by using high-energy ultrasonic waves of 15-25 kHz, instantaneously generating high temperature of more than or equal to 5000K by breaking cavitation bubbles, decomposing water molecules into OH and O (hyperoxyl), and having strong oxidation effect to degrade organic pollutants; meanwhile, under the synergistic effect of electrolysis and ultrasound, the organic matters are degraded by direct electrolytic oxidation (OH generation) and indirect electrolytic oxidation (sodium hypochlorite formation), the COD value of the ozone catalytic oxidation effluent is reduced from 35-175 mg/L to 17.5-87.5 mg/L, and the removal rate of the COD is about 40-60%.
The structure of the membrane filtration system MFS comprises a middle water tank MT, an ultrafiltration device UF, a sludge tank ST, a plate-and-frame filter press PF, a water outlet tank WT and a booster pump P31Sludge screw pump P32Ultrafiltration backwash pump P33And a water outlet pump P34. Wherein the electrolytic ultrasonic reaction effluent ESW is connected to the water inlet of the intermediate water tank MT, and the water outlet of the intermediate water tank MT is connected with the water inlet of the intermediate water tank MT through a booster pump P31Connected with the water inlet of the ultrafiltration device UF, the water outlet of the ultrafiltration device UF is connected with the water inlet of the water outlet pool WT, and the No. 1 water outlet of the water outlet pool WT passes through the water outlet pump P34Sending out treated effluent TW; the No. 2 water outlet of the water outlet pool WT is back washed by the ultrafiltration back washing pump P33Connected with a backwash water inlet of the ultrafiltration device UF, a backwash water outlet of the ultrafiltration device UF is connected with a water inlet of the sludge tank ST, and a water outlet of the sludge tank ST is connected with a water inlet of the sludge screw pump P32The filter press is connected with a sludge inlet of a plate-and-frame filter press PF, a sludge outlet of the plate-and-frame filter press PF sends out a sludge cake SC, and a filtrate outlet of the plate-and-frame filter press PF is connected with a water return port of an intermediate water tank MT; the PVDF hollow fiber ultrafiltration membrane with the aperture of 0.03-0.05 mu m is selected as the membrane filtration system, the membrane filtration system has permanent hydrophilicity and excellent long-term pollution resistance, the stable filtration performance of the ultrafiltration membrane is ensured, the COD value of the electrolyzed ultrasonic reaction effluent is reduced to 10-50 mg/L from 17.5-87.5 mg/L, the removal rate of COD is 31-43%, the content of suspended matters is reduced to less than or equal to 0.1mg/L from 10-150 mg/L, and the removal rate of the suspended matters is more than or equal to 99%. The advanced treatment of the reverse osmosis concentrated water by utilizing the reverse osmosis concentrated water multistage combined technology treatment device achieves the purpose of standard discharge or pretreatment for desalting and recycling by entering a membrane system.
The multi-stage combined technology treatment method of reverse osmosis concentrated water comprises the following steps:
1) performing primary oxidation through a cavitation reaction system, and reducing the COD value of the reverse osmosis concentrated water from 100-500 mg/L to 70-350 mg/L;
2) performing secondary oxidation through an ozone catalytic oxidation system, and reducing the COD value of the cavitation reaction effluent from 70-350 mg/L to 35-175 mg/L;
3) carrying out three-stage oxidation through an electrolytic ultrasonic reaction system to reduce the COD value of the ozone catalytic oxidation effluent from 35-175 mg/L to 17.5-87.5 mg/L;
4) through a membrane filtration system, the COD value of the water produced by the electrolytic ultrasonic reaction is reduced from 17.5-87.5 mg/L to 10-50 mg/L, and the content of suspended matters is reduced from 10-150 mg/L to less than or equal to 0.1 mg/L.
The method comprises the following steps of 1) performing primary oxidation through a cavitation reaction system, specifically, enabling water flow to pass through a cavitation device to generate pressure drop, enabling local pressure to be smaller than saturated steam pressure at corresponding temperature, generating instant collapse of bubbles, generating local high temperature and high pressure in a very small cavitation range, enabling hydroxyl bonds in water to break, forming free radicals such as H (hydrogen radical) and OH (hydroxyl radical), oxidizing organic pollutants by utilizing cavitation, degrading COD, reducing the COD value of reverse osmosis concentrated water from 100-500 mg/L to 70-350 mg/L, and enabling the removal rate of COD to be 20-40%.
The step 2) carries out secondary oxidation through an ozone catalytic oxidation system, in particular to O3(ozone) and H2O2(hydrogen peroxide) composition of 2O3And 1H2O2Can generate 2. OH and 3O2(oxygen molecule) to finally degrade organic matter into CO by the strong oxidizing property of OH2(carbon dioxide) and H2O (water) and other minerals, no secondary pollution, O3And H2O2The combined oxidation process is 2-200 times faster than the single oxidation process; the COD value of the cavitation reaction effluent is reduced from 70-350 mg/L to 35-175 mg/L, and the removal rate of the COD is about 40-60%.
Performing three-stage oxidation by an electrolytic ultrasonic reaction system, specifically forming ultrasonic cavitation by using high-energy ultrasonic waves of 15-25 kHz, instantaneously generating high temperature of more than or equal to 5000K by breaking cavitation bubbles, decomposing water molecules into OH and O (hyperoxy), and having strong oxidation effect to degrade organic pollutants; meanwhile, under the synergistic effect of electrolysis and ultrasound, the organic matters are degraded by direct electrolytic oxidation (OH generation) and indirect electrolytic oxidation (sodium hypochlorite formation), the COD value of the ozone catalytic oxidation effluent is reduced from 35-175 mg/L to 17.5-87.5 mg/L, and the removal rate of the COD is about 40-60%.
And 4) through a membrane filtration system, specifically, the PVDF hollow fiber ultrafiltration membrane with the aperture of 0.03-0.05 mu m is selected as the membrane filtration system, the membrane filtration system has permanent hydrophilicity and excellent long-term pollution resistance, the stable filtration performance of the ultrafiltration membrane is ensured, the COD value of the electrolyzed ultrasonic reaction effluent is reduced to 10-50 mg/L from 17.5-87.5 mg/L, the removal rate of the COD is 31-43%, the content of suspended matters is reduced to less than or equal to 0.1mg/L from 10-150 mg/L, and the removal rate of the suspended matters is more than or equal to 99%. The advanced treatment of the reverse osmosis concentrated water by utilizing the reverse osmosis concentrated water multistage combined technology treatment device achieves the purpose of standard discharge or pretreatment for desalting and recycling by entering a membrane system.
Examples
200 million tons of coke are produced annually by a certain coal chemical industry group, an original 150T/H coking wastewater treatment system carries out advanced treatment by utilizing a reverse osmosis technology, and the produced reverse osmosis concentrated water is discharged to a sewage treatment plant in an industrial park, so that the discharge of total salt is controlled by the drainage index of the sewage treatment plant in the industrial park in the year, and high-salt wastewater is not accepted any more. The group establishes a new concentration and evaporation system for the reverse osmosis concentrated water, and the embodiment is used as the pretreatment of the new concentration and evaporation system, thereby effectively reducing the COD value of the original reverse osmosis concentrated water.
1. Design water quality and quantity of inlet and outlet water
Reverse osmosis concentrated water quantity: 50T/H.
The main water inlet and outlet quality indexes of the reverse osmosis concentrated water are as follows:
components COD SS TDS pH
Unit of mg/L mg/L mg/L
Inflow water 300 100 7500 7.5
Discharging water 30 ≤0.1 7500 7
2. Process flow
2.1 Process flow
The process flow is shown in the process flow chart of the embodiment of the reverse osmosis concentrated water multi-stage combined technology treatment device in the attached figure 4.
2.2 flow sheet description
The reverse osmosis concentrated water firstly enters a reverse osmosis concentrated water tank and is pumped into a cavitation reactor through a lift pump, and part of the reverse osmosis concentrated water in the reverse osmosis concentrated water tank is also pumped into a cavitation device through a cavitation pump and is injected into the cavitation reactor for cavitation reaction to form a first-stage oxidation reaction; the effluent of the cavitation reactor enters an ozone catalytic reactor and is added with H2O2Part of effluent of the cavitation reactor is pumped into a venturi tube through an ozone injection pump to form negative pressure to suck ozone, and is also injected into an ozone catalytic reactor to carry out ozone catalytic reaction to form secondary oxidation reaction;the effluent of the ozone catalytic reactor enters an electrolytic ultrasonic reaction tank, an electrochemical device is connected to an electrode of the electrolytic ultrasonic reaction tank, an ultrasonic generator is connected to an ultrasonic substrate of the electrolytic ultrasonic reaction tank, electrolytic ultrasonic reaction is carried out in the electrolytic ultrasonic reaction tank to form three-stage oxidation reaction, and the three-stage oxidation reaction is utilized to carry out organic matter degradation and reduce the COD value; the effluent of the electrolytic ultrasonic reaction tank enters an intermediate water tank, and is pumped into an ultrafiltration device through a booster pump for filtration, so that suspended matters are filtered, and the COD value is further reduced; the effluent of the ultrafiltration device enters an effluent tank and is sent out by an effluent pump, the ultrafiltration backwash water enters a sludge tank and is pumped into a plate-and-frame filter press by a sludge screw pump to be pressed out of a sludge cake, and the filtrate of the plate-and-frame filter press returns to an intermediate water tank for retreatment.
3. Effect of each main system
The treatment effect of each main system is as follows:
Figure BDA0002835001660000081
4. main equipment parameters
Figure BDA0002835001660000082
Figure BDA0002835001660000091
Figure BDA0002835001660000101
Figure BDA0002835001660000111

Claims (10)

1. The reverse osmosis concentrated water multistage combined technology treatment device is characterized by comprising a cavitation reaction system, an ozone catalytic oxidation system, an electrolytic ultrasonic reaction system and a membrane filtration system; wherein, reverse osmosis concentrated water is input into a water inlet of the cavitation reaction system, a water outlet of the cavitation reaction system is connected with a water inlet of the ozone catalytic oxidation system, a water outlet of the ozone catalytic oxidation system is connected with a water inlet of the electrolytic ultrasonic reaction system, a water outlet of the electrolytic ultrasonic reaction system is connected with a water inlet of the membrane filtration system, treated water is output from the water outlet of the membrane filtration system, and mud cakes are sent out from a mud outlet of the membrane filtration system; wherein the dense water of reverse osmosis carries out the primary oxidation earlier through the cavitation reaction system and sends out cavitation reaction and goes out water, and then carries out the secondary oxidation through ozone catalytic oxidation system and send out ozone catalytic oxidation and go out water, and rethread electrolysis ultrasonic reaction system carries out tertiary oxidation degradation organic pollutant, reduces the COD value and sends out electrolysis ultrasonic reaction and goes out water, filters through membrane filtration system at last and further reduces the COD value to the filtering suspended solid sends out the processing and goes out water.
2. The multistage combination technical treatment device for reverse osmosis concentrated water according to claim 1, wherein the cavitation reaction system structurally comprises a reverse osmosis concentrated water tank, a cavitation reaction tank, a cavitation device, a lift pump and a cavitation pump; wherein the reverse osmosis concentrated water is connected to the water inlet of the reverse osmosis concentrated water tank, the No. 1 water outlet of the reverse osmosis concentrated water tank is connected to the No. 1 water inlet of the cavitation reaction tank through the lift pump, the No. 2 water outlet of the reverse osmosis concentrated water tank is connected to the No. 2 water inlet of the cavitation reaction tank through the cavitation pump and the cavitation device, and the cavitation reaction outlet water is sent out from the water outlet of the cavitation reaction tank.
3. A multi-stage combined technical treatment device for reverse osmosis concentrated water according to claim 1, which is characterized in that the ozone catalytic oxidation system structurally comprises a hydrogen peroxide feeding device, an ozone catalytic reaction box, a Venturi injection device, an ozone generator and an ozone injection pump; the water outlet of the cavitation reaction is connected to the water inlet of the ozone catalytic reaction box, the water outlet of the cavitation reaction is also connected to the water inlet of the Venturi injection device through the ozone injection pump, the air outlet of the ozone generator is connected with the air inlet of the Venturi injection device, the water outlet of the Venturi injection device is connected to the ozone solution inlet of the ozone catalytic reaction box, the medicine outlet of the hydrogen peroxide adding device is connected with the medicine inlet of the ozone catalytic reaction box, and the water outlet of the ozone catalytic reaction box sends out ozone catalytic oxidation water.
4. A multi-stage combined technical treatment device for reverse osmosis concentrated water according to claim 1, wherein the electrolytic ultrasonic reaction system comprises an electrochemical device, an electrolytic ultrasonic reaction tank and an ultrasonic wave generating device, wherein the ozone catalytic oxidation effluent is connected to a water inlet of the electrolytic ultrasonic reaction tank, the electrochemical device is connected with an electrode of the electrolytic ultrasonic reaction tank, the ultrasonic wave generating device is connected with an ultrasonic substrate of the electrolytic ultrasonic reaction tank, and the electrolytic ultrasonic reaction effluent is sent out from a water outlet of the electrolytic ultrasonic reaction tank.
5. A multi-stage combined technical treatment device for reverse osmosis concentrated water according to claim 1, which is characterized in that the membrane filtration system structurally comprises an intermediate water tank, an ultrafiltration device, a sludge tank, a plate-and-frame filter press, a water outlet tank, a booster pump, a sludge screw pump, an ultrafiltration backwashing pump and a water outlet pump; wherein the water outlet of the electrolytic ultrasonic reaction is connected to the water inlet of the intermediate water tank, the water outlet of the intermediate water tank is connected with the water inlet of the ultrafiltration device through the booster pump, the water outlet of the ultrafiltration device is connected with the water inlet of the water outlet pool, and the No. 1 water outlet of the water outlet pool is used for pumping out the treated water through the water outlet pump; the No. 2 water outlet of the water outlet pool is connected with a backwashing water inlet of the ultrafiltration device through an ultrafiltration backwashing pump, a backwashing water outlet of the ultrafiltration device is connected with a water inlet of the sludge pool, a water outlet of the sludge pool is connected with a sludge inlet of the plate-and-frame filter press through a sludge screw pump, a sludge cake is sent out from a sludge outlet of the plate-and-frame filter press, and a filtrate outlet of the plate-and-frame filter press is connected with a water return port of the intermediate water tank.
6. The treatment method of the multistage combination technical treatment device for reverse osmosis concentrated water according to claim 1, which is characterized by comprising the following steps:
1) performing primary oxidation through a cavitation reaction system, and reducing the COD value of the reverse osmosis concentrated water from 100-500 mg/L to 70-350 mg/L;
2) performing secondary oxidation through an ozone catalytic oxidation system, and reducing the COD value of the cavitation reaction effluent from 70-350 mg/L to 35-175 mg/L;
3) carrying out three-stage oxidation through an electrolytic ultrasonic reaction system to reduce the COD value of the ozone catalytic oxidation effluent from 35-175 mg/L to 17.5-87.5 mg/L;
4) through a membrane filtration system, the COD value of the water produced by the electrolytic ultrasonic reaction is reduced from 17.5-87.5 mg/L to 10-50 mg/L, and the content of suspended matters is reduced from 10-150 mg/L to less than or equal to 0.1 mg/L.
7. The method for treating a reverse osmosis concentrated water multistage combination technology treatment device according to claim 6, wherein the step 1) is to perform a first-stage oxidation through a cavitation reaction system, specifically, a water flow is made to pass through a cavitation device to generate a pressure drop, so that the local pressure is lower than the saturated vapor pressure at the corresponding temperature, the generated bubbles are instantly destroyed, local high temperature and high pressure are generated in a very small cavitation range, hydroxyl bonds in water are broken to form free radicals such as H hydrogen radicals, OH hydroxyl radicals and the like, organic pollutants are oxidized by cavitation, COD is degraded, the COD value of the reverse osmosis concentrated water is reduced from 100-500 mg/L to 70-350 mg/L, and the removal rate of the COD is 20-40%.
8. The treatment method of the multistage combination technical treatment device for reverse osmosis concentrated water according to claim 6, characterized in that the step 2) is carried out by an ozone catalytic oxidation system to carry out secondary oxidation, in particular to carry out O3And H2O2Combination, 2 of O3And 1H2O2Can generate 2. OH and 3O2Thereby utilizing the strong oxidizing property of OH to finally degrade organic matters into CO2And H2O and other minerals, no secondary pollution, O3And H2O2The combined oxidation process is 2-200 times faster than the single oxidation process; the COD value of the cavitation reaction effluent is reduced from 70-350 mg/L to 35-175 mg/L, and the removal rate of the COD is about 40-60%.
9. The treatment method of the multistage combination technical treatment device for reverse osmosis concentrated water according to claim 6, characterized in that the step 3) is carried out three-stage oxidation by an electrolytic ultrasonic reaction system, specifically, ultrasonic cavitation is formed by using high-energy ultrasonic waves of 15-25 kHz, high temperature of not less than 5000K is generated at the moment of collapse of cavitation bubbles, water molecules are decomposed into OH and O (hyperoxia), and the organic pollutants are degraded by strong oxidation; and simultaneously, under the synergistic effect of electrolysis and ultrasound, OH generated by direct electrolytic oxidation and indirect electrolytic oxidation are utilized to form sodium hypochlorite to degrade organic matters, the COD value of the water discharged by ozone catalytic oxidation is reduced from 35-175 mg/L to 17.5-87.5 mg/L, and the removal rate of the COD is about 40-60%.
10. The treatment method of the multistage combination technical treatment device for reverse osmosis concentrated water according to claim 6, characterized in that the step 4) is implemented by a membrane filtration system, specifically, the membrane filtration system is a PVDF hollow fiber ultrafiltration membrane with the pore diameter of 0.03-0.05 μm, the PVDF hollow fiber ultrafiltration membrane has permanent hydrophilicity and excellent long-term pollution resistance, the stable filtration performance of the ultrafiltration membrane is ensured, the COD value of water produced by the electrolytic ultrasonic reaction is reduced to 10-50 mg/L from 17.5-87.5 mg/L, the removal rate of the COD is 31-43%, the content of suspended matters is reduced to less than or equal to 0.1mg/L from 10-150 mg/L, and the removal rate of the suspended matters is more than or equal to 99%.
CN202011467693.7A 2020-12-14 2020-12-14 Reverse osmosis concentrated water multi-stage combined technology treatment device and treatment method Pending CN112679008A (en)

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