CN112499852A - Device and method for treating high-concentration styrene wastewater through electrooxidation - Google Patents
Device and method for treating high-concentration styrene wastewater through electrooxidation Download PDFInfo
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- CN112499852A CN112499852A CN202011392296.8A CN202011392296A CN112499852A CN 112499852 A CN112499852 A CN 112499852A CN 202011392296 A CN202011392296 A CN 202011392296A CN 112499852 A CN112499852 A CN 112499852A
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
Abstract
The invention discloses a device for treating high-concentration styrene wastewater by electrooxidation, which comprises an electrooxidation reactor, a liquid inlet and a drain outlet, wherein the liquid inlet and the drain outlet are arranged at the bottom of the outer wall of the electrooxidation reactor and are respectively arranged at two sides of the electrooxidation reactor; an electrode assembly is arranged in the electrooxidation reactor, and comprises a rod-shaped metal electrode, a fixed pore plate for fixing the metal electrode, a power supply and a lead; and a filter screen is arranged above the electrode assembly and used for filtering the wastewater after the electrooxidation treatment. The invention also discloses a method for treating high-concentration styrene wastewater by utilizing the electrooxidation device, which has the advantages of low energy consumption, high efficiency, compactness, high treatment depth and simple equipment.
Description
Technical Field
The invention belongs to the environmental protection field of organic wastewater treatment, and particularly relates to a device and a method for treating high-concentration styrene wastewater through electrooxidation.
Background
The styrene has wide source and relates to the petrochemical production and manufacturing process and the industries of plastics, rubber and the like. The styrene pollution has the characteristics of concealment, long-term property, non-reversibility and the like, can directly enter water, atmosphere and soil to cause direct pollution, and can also mutually migrate in various environments to cause indirect pollution. Styrene has teratogenicity, mutagenicity, carcinogenesis and other hazards to human bodies, and belongs to 2B carcinogens in carcinogen lists published by the international cancer research institution of the world health organization. The realization of the oxidative degradation of the styrene wastewater is one of the problems in the current organic wastewater treatment.
The prior method for removing styrene in wastewater comprises a chemical precipitation method, a biological flocculation method, a supercritical method, an electrochemical oxidation technology, a photocatalytic oxidation technology, solvent extraction and the like, but most of the processes and equipment have high cost, low efficiency and complex operation, and the subsequent treatment is difficult or only suitable for specific working conditions. Among them, the electrochemical oxidation technology has been successfully used in the treatment process of high concentration styrene wastewater due to simple equipment, easy control and easy continuous operation, but the traditional electrode form has lower efficiency and larger energy consumption.
CN109467205A discloses a high-concentration organic wastewater treatment system, which is characterized in that organic wastewater is pretreated by coal briquettes to reduce the COD content in the organic wastewater, the tail end of the system is filtered by active carbon, and the system mainly depends on the filtering and adsorbing action, so that the organic wastewater treatment depth of the system is low, and the treatment process of the system is complex; CN204022579U discloses an organic wastewater COD separation device, which is connected with a COD membrane through a reservoir outlet and utilizes the reverse osmosis of the COD membrane to realize the removal of the organic wastewater COD, although the device has large treatment capacity, the device has the possibility of membrane pollution and is easy to cause equipment blockage; CN1435381A discloses a method for treating biologically-nondegradable organic wastewater by CuCl film, which utilizes CuCl2The CuCl film generated by soaking the copper mesh in the solution is used as a catalyst, the CuCl/copper mesh catalyst is placed in a reactor, air is introduced for oxidation reaction to treat wastewater, and the solution after reaction is added with polymeric ferric sulfate for sedimentation.
Therefore, the device and the method for treating the high-concentration styrene wastewater, which have the advantages of low energy consumption, high efficiency, compactness, high treatment depth and simple equipment, have great positive significance and economic value.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a device and a method for treating high-concentration styrene wastewater by electrooxidation, which have the advantages of low energy consumption, high efficiency, compactness, high treatment depth and simple equipment.
In order to achieve the purpose, the invention adopts the following technical scheme:
a device for treating high-concentration styrene wastewater by electrooxidation comprises an electrooxidation reactor, and a liquid inlet and a drain outlet which are arranged at the bottom of the outer wall of the electrooxidation reactor, wherein the liquid inlet and the drain outlet are respectively arranged at two sides of the electrooxidation reactor, and the top of the outer wall of the electrooxidation reactor is provided with a liquid outlet; an electrode assembly is arranged in the electrooxidation reactor, and comprises a rod-shaped metal electrode, a fixed pore plate for fixing the metal electrode, a power supply and a lead; and a filter screen is arranged above the electrode assembly and used for filtering the wastewater after the electrooxidation treatment.
According to a preferred embodiment of the present invention, the metal electrode comprises a rod-shaped cathode electrode and a plurality of rod-shaped anode electrodes, and the cathode electrode and the anode electrodes are vertically placed inside the electro-oxidation reactor.
According to the preferred embodiment of the present invention, the cathode electrode is located at the center of the electro-oxidation reactor, and the plurality of anode electrodes are uniformly arranged around the cathode electrode along the circumference; the cathode electrode is used as the cathode of the electrode assembly and is connected with a power supply through a lead; the anode electrodes are connected in series through leads to form the anode of the electrode assembly, and are connected with a power supply through leads.
According to the preferred embodiment of the present invention, the diameter of the cathode electrode and the anode electrode is 8-15mm, and the length is 800-1000 mm; and a first small hole with the diameter of 6mm is arranged 15-20mm below the top end of the anode electrode and is used for connecting a lead to realize the connection of the anode in the electrode assembly.
According to the preferred embodiment of the invention, the fixed orifice plate comprises an upper fixed orifice plate and a lower fixed orifice plate which are made of polytetrafluoroethylene, a plurality of openings are formed in the center and the outer ring of the fixed orifice plate, and two ends of the cathode electrode and the anode electrode penetrate through the openings, so that the cathode electrode and the anode electrode are fixed.
According to the preferred embodiment of the invention, the diameter of the fixed orifice plate is 400-500mm, the thickness of the fixed orifice plate is 20mm, and the diameter of the opening of the fixed orifice plate is 8-15 mm; the fixed orifice plate is provided with a plurality of second small holes for liquid to pass through.
According to a preferred embodiment of the present invention, the interval between the bottom and 80% of the height of the electrooxidation reactor is a electrooxidation reaction interval, and the interval between the 80% of the height of the electrooxidation reactor and the top is a filtration interval; the distance between the filter screen and the top of the electrooxidation reactor is 5-15% of the height of the electrooxidation reactor.
The invention also discloses a method for treating high-concentration styrene wastewater by utilizing the electrooxidation of the device, which comprises the following steps:
(1) adding electrolyte NaCl into the high-concentration styrene wastewater, stirring and mixing to ensure that the concentration of NaCl in the mixed wastewater is 0.3-0.5 mol/L;
(2) pumping the high-concentration styrene wastewater into the electrooxidation reactor through a booster pump to perform oxidation reaction, so that styrene in the wastewater is oxidized and degraded;
(3) and (3) discharging the styrene wastewater oxidized and degraded in the step (2) through a filter screen in the electrooxidation reactor and then through a liquid outlet, and discharging flocculent solids generated by oxidation and degradation through a sewage outlet of the electrooxidation reactor.
According to the preferred embodiment of the present invention, the power supply is a dc power supply, and is operated at a constant voltage; when the content of the styrene in the high-concentration styrene wastewater is 10ppm-1000ppm, the working voltage range is 20V-25V; when the content of the styrene is 1000ppm-8000ppm, the working voltage range is 25V-30V; when the content of the styrene is 8000ppm-15000ppm, the working voltage range is 30V-35V.
According to a preferred embodiment of the present invention, the cross-sectional flow rate of the high-concentration styrene wastewater through the electro-oxidation reactor ranges from 0.001m/s to 0.1 m/s; the pressure drop of the high-concentration styrene wastewater in the electro-oxidation reactor is 0.005MPa-0.3 MPa.
The invention has the beneficial effects that: the invention provides a device and a method for treating high-concentration styrene wastewater by electrooxidation, which utilize the oxidation action of an anode in an electrooxidation reactor on styrene, and comprise the dual action of direct anodic oxidation and indirect anodic oxidation to oxidize and degrade the dissolved styrene.
Drawings
FIG. 1 is a schematic diagram of the anodic indirect oxidation of styrene according to the present invention;
FIG. 2 is a schematic diagram of the configuration of an electrooxidation reactor apparatus according to the present invention;
FIG. 3 is a schematic view showing the process of treating high concentration styrene wastewater by electrooxidation according to the present invention;
description of the symbols:
1-liquid inlet, 2-anode electrode bar, 3-sewage outlet, 4-lead, 5-power supply, 6-filter screen, 7-liquid outlet, 8-fixed orifice plate, 9-cathode electrode bar, 10-electrooxidation reactor, 11-booster pump and 12-flowmeter.
Detailed Description
The invention is further illustrated with reference to the following figures and examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the invention by those skilled in the art based on the teachings herein are within the scope of the present invention.
The technical conception of the invention is as follows: the principle of the electrochemical oxidation technology-based method for removing high-concentration styrene wastewater COD is that oxidation of styrene at an anode oxidizes and degrades dissolved styrene, and the oxidation degradation comprises dual functions of direct anodic oxidation and indirect anodic oxidation, wherein the indirect anodic oxidation is dominant. Specifically, direct anodic oxidation means that styrene loses electrons at the anode and is oxidized, and then is directly converted into harmless substances; as shown in FIG. 1, indirect anodic oxidation means that water molecules, chloride ions and the like in wastewater react at the anode to generate Cl2、O2、ClO2、H2O2Or intermediate products such as intermediate free radical OH, ClOH and the like, and the intermediate products have strong oxidizing property and further oxidize and degrade the styrene, thereby achieving the aims of deeply removing the styrene and reducing COD.
Example 1
As shown in fig. 2, the device for treating high-concentration styrene wastewater by electrooxidation comprises an electrooxidation reactor 10, and a liquid inlet 1 and a drain outlet 3 which are arranged at the bottom of the outer wall of the electrooxidation reactor 10, wherein the liquid inlet 1 and the drain outlet 3 are respectively arranged at two sides of the electrooxidation reactor 10, and a liquid outlet 7 is arranged at the top of the outer wall of the electrooxidation reactor 10; an electrode assembly is arranged in the electrooxidation reactor 10 and comprises a rod-shaped metal electrode, a fixed pore plate 8 for fixing the metal electrode, a power supply 5 and a lead 4; and a filter screen 6 is arranged above the electrode assembly and is used for filtering the wastewater after the electrooxidation treatment.
Further, the metal electrode comprises a rod-shaped cathode electrode 9 and a plurality of rod-shaped anode electrodes 2, the cathode electrode 9 and the anode electrodes 2 are vertically placed inside the electro-oxidation reactor 10, the cathode electrode 9 is located in the center of the electro-oxidation reactor 10, and the plurality of anode electrodes 2 are uniformly arranged around the cathode electrode 9 along the circumference. The cathode electrode 9 is used as the cathode of the electrode assembly and is connected with a power supply 5 through a lead 4; the anode electrodes 2 are connected in series through leads 4 to form the anode of the electrode assembly, and are connected with a power supply 5 through the leads 4.
Preferably, the diameter of the cathode electrode 9 and the anode electrode 2 is 8-15mm, and the length is 800-1000 mm; a first small hole (not shown in the figure) with the diameter of 6mm is arranged 15-20mm below the top end of the anode electrode 2 and is used for connecting a lead 4 to realize the connection of the anode in the electrode assembly; the fixed orifice plate 8 comprises an upper fixed orifice plate and a lower fixed orifice plate which are made of polytetrafluoroethylene, the diameter of the fixed orifice plate 8 is 400-500mm, the thickness of the fixed orifice plate 8 is 20mm, the center and the outer ring of the fixed orifice plate 8 are provided with a plurality of openings with the diameter of 8-15mm, and two ends of the cathode electrode 9 and the anode electrode 2 penetrate through the openings so as to fix the cathode electrode 9 and the anode electrode 2; the fixed orifice plate 8 is provided with a plurality of second small holes (not shown) for allowing liquid to pass through.
Further, the lower fixed orifice plate 8 is located at the bottom of the electrooxidation reactor 10, and the distance between the upper fixed orifice plate 8 and the lower fixed orifice plate 8 is 80% of the height of the electrooxidation reactor 10, that is, the interval between the bottom and 80% of the height of the electrooxidation reactor 10 is the electrooxidation reaction interval, and the interval between the 80% of the height of the electrooxidation reactor 10 and the top is the filtration interval. Preferably, the distance between the screen 6 and the top of the electrooxidation reactor 10 is 5-15% of the height of the electrooxidation reactor 10.
As shown in FIG. 3, the method for treating high-concentration styrene wastewater by electrooxidation using the device comprises the following steps:
(1) adding electrolyte NaCl into the high-concentration styrene wastewater, stirring and mixing to ensure that the concentration of NaCl in the mixed wastewater is 0.3-0.5 mol/L;
(2) pumping the wastewater into the electro-oxidation reactor 10 through a booster pump 11, monitoring the flow through a flow meter 12, carrying out oxidation reaction on the high-concentration styrene wastewater in the electro-oxidation reactor 10, and carrying out oxidative degradation on the styrene in the wastewater;
(3) and (3) discharging the styrene wastewater oxidized and degraded in the step (2) through a filter screen 6 in the electrooxidation reactor 10 and then through a liquid outlet 7, and discharging flocculent solids generated by oxidation and degradation from a sewage outlet 3 of the electrooxidation reactor 10.
Further, the power supply 5 is a direct current power supply and is a constant voltage when working; according to a large number of experiments and researches, the required working voltage is increased along with the increase of the content of the styrene in the high-concentration styrene wastewater; when the content of the styrene in the high-concentration styrene wastewater is 10ppm-1000ppm, the working voltage range is 20V-25V; when the content of the styrene is 1000ppm-8000ppm, the working voltage range is 25V-30V; when the content of the styrene is 8000ppm-15000ppm, the working voltage range is 30V-35V.
Further, the cross-sectional flow rate of the high-concentration styrene wastewater passing through the electrooxidation reactor 10 is in the range of 0.001m/s to 0.1 m/s; the pressure drop of the high-concentration styrene wastewater in the electro-oxidation reactor 10 is 0.005Mpa-0.3 Mpa.
Example 2
The device and the method of the embodiment 1 are adopted to treat high-concentration styrene wastewater of a certain petrochemical plant, and the wastewater comprises the following components by analysis and detection: 1.4753 wt% styrene, i.e., about 14753ppm styrene, 0.0809 wt% phenol, 0.0486 wt% ethylbenzene, 0.0133 wt% toluene, and 0.0426% propylene glycol; the COD value of the wastewater is 2467 mg/L. According to the process requirements, the treated high-concentration styrene wastewater has the styrene content of less than 0.0250 wt% and the COD of less than 300 mg/L.
The method comprises the following steps:
(1) 5m to the petrochemical plant3Adding 2000mol of NaCl into a water sample of the high-concentration styrene wastewater to be treated, and fully stirring to uniformly mix the NaCl and the water sample.
(2) The high-concentration styrene wastewater is pumped into the electrooxidation reactor by a booster pump, the flow rate of the wastewater in the electrooxidation reactor is 0.05m/s, the output voltage of a power supply is set to be 30V, styrene is subjected to anodic oxidation in the electrooxidation reactor and is converted into substances such as benzyl alcohol, styrene oxide, phenyl-1, 2 ethylene glycol and the like, and white flocculent solids are generated.
(3) And (3) discharging the styrene wastewater oxidized and degraded in the step (2) through a filter screen 6 in the electrooxidation reactor 10 and then through a liquid outlet 7, and discharging white flocculent solids generated by oxidation and degradation from a sewage outlet 3 of the electrooxidation reactor 10.
And (4) analyzing results: the styrene content of the wastewater to be treated is 1.4753 wt%, the COD value is 2467mg/L, after the wastewater is treated by the electro-oxidation reactor, the styrene content in the water at the discharge port of the device is reduced to 0.0100 wt%, and the COD value is reduced to 240mg/L, which is lower than the separation index. The treatment method achieves the expected effect and meets the requirements.
Claims (10)
1. The device for treating the high-concentration styrene wastewater through electrooxidation is characterized by comprising an electrooxidation reactor, a liquid inlet and a drain outlet, wherein the liquid inlet and the drain outlet are formed in the bottom of the outer wall of the electrooxidation reactor and are respectively arranged on two sides of the electrooxidation reactor; an electrode assembly is arranged in the electrooxidation reactor, and comprises a rod-shaped metal electrode, a fixed pore plate for fixing the metal electrode, a power supply and a lead; and a filter screen is arranged above the electrode assembly and used for filtering the wastewater after the electrooxidation treatment.
2. The apparatus for treating styrene wastewater according to claim 1, wherein said metal electrodes comprise a rod-shaped cathode electrode and a plurality of rod-shaped anode electrodes, said cathode electrode and said anode electrodes being disposed in a vertical manner inside said electro-oxidation reactor.
3. The apparatus for treating styrene wastewater according to claim 2, wherein the cathode is located at the center of the electrooxidation reactor, and the plurality of anode electrodes are uniformly arranged around the cathode along the circumference; the cathode electrode is used as the cathode of the electrode assembly and is connected with a power supply through a lead; the anode electrodes are connected in series through leads to form the anode of the electrode assembly, and are connected with a power supply through leads.
4. The apparatus for treating styrene wastewater as set forth in claim 3, wherein the cathode and anode electrodes have a diameter of 8-15mm and a length of 800-1000 mm; and a first small hole with the diameter of 6mm is arranged 15-20mm below the top end of the anode electrode and is used for connecting a lead to realize the connection of the anode in the electrode assembly.
5. The apparatus of claim 2, wherein the fixed orifice plate comprises an upper fixed orifice plate and a lower fixed orifice plate made of polytetrafluoroethylene, the center and the outer ring of the fixed orifice plate are provided with a plurality of openings, and the two ends of the cathode electrode and the anode electrode are inserted into the openings to fix the cathode electrode and the anode electrode.
6. The apparatus for treating styrene wastewater as set forth in claim 5, wherein the fixed orifice plate has a diameter of 400-500mm and a thickness of 20mm, and the diameter of the opening of the fixed orifice plate is 8-15 mm; the fixed orifice plate is provided with a plurality of second small holes for liquid to pass through.
7. The apparatus for treating styrene wastewater according to claim 1, wherein the interval between the bottom and 80% of the height of the electro-oxidation reactor is an electro-oxidation reaction interval, and the interval between the 80% of the height of the electro-oxidation reactor and the top of the electro-oxidation reactor is a filtration interval; the distance between the filter screen and the top of the electrooxidation reactor is 5-15% of the height of the electrooxidation reactor.
8. A method for treating high concentration styrene wastewater by using the electrooxidation apparatus of any one of claims 1 to 7, wherein the method comprises the steps of:
(1) adding electrolyte NaCl into the high-concentration styrene wastewater, stirring and mixing to ensure that the concentration of NaCl in the mixed wastewater is 0.3-0.5 mol/L;
(2) pumping the high-concentration styrene wastewater into the electrooxidation reactor through a booster pump to perform oxidation reaction, so that styrene in the wastewater is oxidized and degraded;
(3) and (3) discharging the styrene wastewater oxidized and degraded in the step (2) through a filter screen in the electrooxidation reactor and then through a liquid outlet, and discharging flocculent solids generated by oxidation and degradation through a sewage outlet of the electrooxidation reactor.
9. The method for treating styrene wastewater according to claim 8, wherein the power source is a DC power source and is operated at a constant voltage; when the content of the styrene in the high-concentration styrene wastewater is 10ppm-1000ppm, the working voltage range is 20V-25V; when the content of the styrene is 1000ppm-8000ppm, the working voltage range is 25V-30V; when the content of the styrene is 8000ppm-15000ppm, the working voltage range is 30V-35V.
10. The method for treating styrene wastewater according to claim 8, wherein the cross-sectional flow rate of the high concentration styrene wastewater through the electro-oxidation reactor is in the range of 0.001m/s to 0.1 m/s; the pressure drop of the high-concentration styrene wastewater in the electro-oxidation reactor is 0.005MPa-0.3 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011392296.8A CN112499852A (en) | 2020-12-01 | 2020-12-01 | Device and method for treating high-concentration styrene wastewater through electrooxidation |
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