CN113104927B - Treatment device and treatment method for high-salt-content degradation-resistant organic wastewater - Google Patents
Treatment device and treatment method for high-salt-content degradation-resistant organic wastewater Download PDFInfo
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- CN113104927B CN113104927B CN202110332996.6A CN202110332996A CN113104927B CN 113104927 B CN113104927 B CN 113104927B CN 202110332996 A CN202110332996 A CN 202110332996A CN 113104927 B CN113104927 B CN 113104927B
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Abstract
The application belongs to the technical field of wastewater treatment methods and device designs, and particularly relates to a treatment device and a treatment method for high-salt-content degradation-resistant organic wastewater, wherein the treatment device comprises a microwave generation device and a reactor, and the microwave generation device comprises at least one electrode; the reactor comprises: a housing; the electrode mounting hole is formed in the bottom plate of the shell and used for enabling the electrode to extend into the inner cavity of the shell; the water distribution pipeline is communicated with the water inlet pipeline, and a plurality of water distribution pipe water outlets are uniformly distributed around the electrode mounting hole; the water outlet of the reactor arranged on the shell is communicated with a water outlet pipeline. According to the treatment device and the treatment method for the high-salt-content degradation-resistant organic wastewater, microwave energy is injected into the organic wastewater uniformly distributed around the electrode to generate microwave plasma, and then pollutants in the high-salt-content degradation-resistant organic wastewater are efficiently treated by the microwave plasma.
Description
Technical Field
The application belongs to the technical field of wastewater treatment methods and device designs, and particularly relates to a treatment device and a treatment method for high-salt-content refractory organic wastewater.
Background
In recent years, especially in the chemical industry such as petrochemical industry, pharmaceutical industry, papermaking, printing and dyeing industry, large amounts of high-concentration organic wastewater is difficult to effectively treat and degrade by adopting the traditional treatment method due to the diversity and complexity of raw materials. The waste water has the characteristics of complex components, high salinity, high chromaticity, high pollutant concentration and the like, and most of organic pollutants have extremely high biological toxicity and carcinogenicity.
At present, the treatment method for the organic wastewater with high salt content generally adopts the following steps: 1) Desalting, and performing standard treatment by using a traditional microbial method; 2) The sewage is converted into easily biodegradable sewage by advanced oxidation technology and then is treated by a microbiological method to reach the standard. Although the scheme 1 can treat water up to the standard, the removed salt is regarded as dangerous waste due to the organic pollutant, and the treatment cost is high. The treatment idea of the 2 nd scheme is to reduce the pollutants to meet the requirements, and then desalt the pollutants to recover the salt as industrial salt.
Aiming at advanced oxidation technology, the main applications that can be matured at present include: 1) Fenton and Fenton-like series oxidation technologies; 2) Ozone oxidation technology; 3) Electrocatalytic oxidation technology; 4) Wet catalytic oxidation technology; 5) Supercritical water oxidation technology. However, the above advanced oxidation technology still has many disadvantages in engineering applications: the Fenton and Fenton-like oxidation technology has the defects of high labor intensity (more medicament adding types and the need of adjusting the pH value twice), large sludge amount and the like; the ozone oxidation technology has the biggest problems of low ozone utilization rate, high energy consumption and low treatment effect in a high-salt environment; the electrocatalytic oxidation technology also has the defects of low current efficiency, high energy consumption, short electrode service life and the like; the wet oxidation technology relates to a pressure vessel, so the requirements on equipment and process are high, the requirements on operators are also high, and a large number of researches show that intermediate products, namely benzoic acid and acetic acid, have an inhibiting effect on wet oxidation; the supercritical water oxidation technology has high oxidation efficiency, thorough treatment and no secondary pollution, but also has the problems of equipment corrosion, salt precipitation and deposition at high temperature, and has huge equipment investment.
Later, langmuir et al first proposed the basic concept of plasma in 1928, indicating that plasma is the fourth basic form of species present. Plasma is an aggregate of a large number of electrons, ions, atoms, molecules, radical particles, and the like, and is macroscopically electrically neutral.
The main reason is that the discharge plasma contains a large amount of high-energy electrons, free radicals, ions and the like, wherein the high-energy electrons can directly collide with the organic pollutants (also called as 'particle inelastic collision'), so that the pollutants are activated in an excited state and even directly degraded; in addition, active species generated by the collision of high-energy electrons can directly oxidize and degrade (also called as "active species oxidation") organic pollutants. Further, in addition to the active material caused by the collision of high-energy electrons, the discharge process is accompanied by the effects of ultraviolet radiation, pyrolysis, ultrasonic waves, and the like, which are beneficial to promoting the degradation of organic pollutants. In summary, the plasma utilizes the physical and chemical effects generated by the discharge to act on the organic pollutants together, so that the organic pollutants can be degraded in a short time.
At present, the methods of liquid phase discharge include: 1) Glow discharge; 2) Dielectric barrier discharge; 3) Arc discharge; 4) And (4) discharging by microwave. The various discharge techniques described above are characterized by: glow discharge requires a direct-current high-voltage power supply, the cost of the electrode is high, electrode corrosion is easy to generate in the discharge process, most energy is used for raising the temperature of the material in the glow discharge process, and the consumed power is high; the medium barrier discharge adopts a sine-wave alternating-current high-voltage power supply, the discharge is uniform, the electrode is not easy to corrode, but the high-voltage pulse power supply required by the discharge has high energy consumption and great design and production difficulty; the plasma generated by arc discharge has high temperature, high energy and high density, but the electrode is extremely easy to corrode due to the high temperature, and the arc generated by the discharge is difficult to extinguish; the microwave discharge belongs to a high-frequency discharge plasma method, can maintain continuous and stable discharge regardless of the existence of medium blocking, has high energy utilization rate, does not have electrode pollution, and can generate under normal temperature and normal pressure.
However, at present, there is no device or method for treating organic wastewater with high salt content and difficult biodegradation by directly adopting plasma generated by liquid phase discharge, and most of the devices or methods utilize the characteristic that microwaves can penetrate through a non-metal container to excite a fixed catalyst in the container, so that the effect of microwave catalytic oxidation is achieved, and the decomposition speed of organic matters in the wastewater is improved.
Disclosure of Invention
In order to solve at least one technical problem in the prior art, the invention provides a treatment device and a treatment method for high-salt-content degradation-resistant organic wastewater.
In a first aspect, the application discloses a treatment device for refractory organic wastewater with high salt content, comprising a microwave generation device and a reactor, wherein the microwave generation device comprises at least one electrode for generating microwave plasma, and the reactor comprises:
a closed housing;
the electrode mounting holes penetrate through the bottom plate of the shell, and one electrode extends into the inner cavity of the shell through one corresponding electrode mounting hole and is fixed on the electrode mounting hole;
the water distribution pipeline comprises a water distribution pipe water inlet and a water distribution pipe water outlet, the water distribution pipe water inlet is communicated with a water inlet pipeline positioned outside the shell, the water distribution pipe water outlet is communicated to the inner cavity of the shell, and a plurality of water distribution pipe water outlets are distributed around each electrode mounting hole;
and the water outlet of the reactor is arranged on the shell in a penetrating way and is communicated with a water outlet pipeline positioned on the outer side of the shell.
According to at least one embodiment of the application, each water distribution pipe water outlet is communicated with a perforated pipe, wherein one end of each perforated pipe communicated with the water distribution pipe water outlet is an open end, the other opposite end of each perforated pipe is a sealed end, and a plurality of water outlet holes are formed in the pipe wall of each perforated pipe; and
the plurality of perforated pipes distributed around each electrode mounting hole are parallel to the electrodes in the electrode mounting hole and are perpendicular to the bottom plate, and in addition, the plurality of water outlet holes in each perforated pipe face the corresponding electrodes.
According to at least one embodiment of the application, around any one of the electrode mounting holes, a plurality of water distribution pipe water outlets are uniformly distributed on a concentric circle with the electrode mounting hole as the center.
According to at least one embodiment of this application, the casing is cylindricly, just the quantity of electrode and the corresponding electrode mounting hole is a plurality of, wherein, one the electrode mounting hole sets up the centre of a circle department of bottom plate, other the electrode mounting hole evenly distributed is on the concentric circle of this centre of a circle.
According to at least one embodiment of the application, the distance between the water outlets of the plurality of water distribution pipes on the same concentric circle and the corresponding circle center is 5-10cm; and
the axial height of the perforated pipe is greater than that of the electrode, and the aperture of the water outlet hole in the perforated pipe is 5-10mm.
According to at least one embodiment of the present application, the water distribution pipeline is disposed on the inner side surface of the bottom plate, the water distribution inlet thereof penetrates through the bottom plate from inside to outside and then is communicated with the water inlet pipeline, and the water distribution outlet thereof is distributed on the inner side surface of the bottom plate around the corresponding electrode mounting hole.
According to at least one embodiment of the present application, the reactor further comprises:
the exhaust hole penetrates through the top of the shell;
and the vacuum pump is communicated to the exhaust hole through an exhaust pipeline.
According to at least one embodiment of the present application, the reactor further comprises:
and the reactor water outlet penetrates through the position, close to the bottom plate, on the shell and is communicated with a water outlet pipeline positioned outside the shell, and the water outlet pipeline is communicated with an emptying pipeline.
According to at least one embodiment of the present application, the microwave generating device further comprises a power supply, a microwave generator, and a waveguide assembly electrically connected in sequence, the waveguide assembly being connected to the electrode through a coaxial cable.
In a second aspect, the application also discloses a treatment method for refractory organic wastewater with high salt content, which adopts the treatment device of any one of the first aspects to complete the following steps:
controlling the high-salt-content refractory organic wastewater to flow into a water distribution pipeline from a water inlet pipeline and then flow into the inner cavity of the reactor shell from a plurality of water distribution pipe water outlets of the water distribution pipeline, wherein the high-salt-content refractory organic wastewater flowing out of the water distribution pipe water outlets can be uniformly distributed around corresponding electrodes;
and simultaneously, adjusting the output power of the microwave generating device, injecting microwave energy into the high-salt-content refractory organic wastewater uniformly distributed around through the electrodes to generate microwave plasma, and treating pollutants in the high-salt-content refractory organic wastewater through the microwave plasma.
The application has at least the following beneficial technical effects:
according to the treatment device and the treatment method for the high-salt-content degradation-resistant organic wastewater, the electrodes of the microwave generation device are arranged in the reactor, the microwave energy transmitted by the electrodes can quickly vaporize the liquid around the electrodes to generate bubbles, and the generated strong field acting force breaks down the bubbles, so that plasma is generated around the tips of the electrodes, and the plasma jointly acts on pollutants in the organic wastewater by utilizing the physicochemical effect generated by discharge to ensure that the pollutants can be degraded in a short time, so that the treatment efficiency is improved;
in addition, a plurality of water distribution pipe water outlets are distributed around one electrode mounting hole, so that liquid around the electrode is distributed more uniformly, and the plasma generation efficiency and the organic wastewater treatment efficiency are improved.
Drawings
FIG. 1 is a schematic diagram of the structure of a treatment device for refractory organic wastewater with high salt content;
FIG. 2 is a top view of a structure for showing an arrangement mode of electrodes in a specific embodiment of the present application for a treatment device of refractory organic wastewater with high salt content;
FIG. 3 is a top view of a connection structure for connecting electrodes and a microwave generator according to an embodiment of the present application for treating refractory organic wastewater with high salt content;
FIG. 4 is a schematic diagram of the connection between the electrodes and the coaxial cable in the treatment device for high-salt-content refractory organic wastewater;
FIG. 5 is a top view of a water distribution pipeline and an electrode arrangement in an embodiment of the present invention for treating high-salinity refractory organic wastewater;
FIG. 6 is a front view of the structure of the present application for a device for treating refractory organic wastewater with high salt content, which is used for showing the relative position of a perforated pipe and an electrode.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
It should be understood that terms of orientation or positional relationship that may be referred to in the description of the present application, such as "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, are based on the orientation or positional relationship shown in the drawings and are used for convenience in describing the present application and for simplicity of description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the present application.
In a first aspect, as shown in fig. 1, the application discloses a treatment device for refractory organic wastewater with high salt content, which may comprise a microwave generation device and a reactor 1.
Wherein the microwave generating means comprises at least one electrode 5 for generating a microwave plasma; it should be noted that the microwave generating device may be selected from various suitable microwave generating devices known at present as long as it is capable of injecting microwave energy into the wastewater to be treated and generating microwave plasma through its electrodes, as needed.
As shown in fig. 1, the microwave generating device of the present application further includes a power supply 11 (for supplying power), a microwave generator 10 and a waveguide assembly 9 electrically connected in sequence, wherein the waveguide assembly 9 is connected with the electrode 5 through the coaxial cable 6; also, referring to fig. 3, a waveguide assembly 9 is connected to a plurality of (e.g., 5 in fig. 3) electrodes 5 simultaneously through a plurality of (e.g., 5 in fig. 3) coaxial cables 6.
Further, the reactor 1 of the present application may be provided in a variety of suitable configurations, and referring to fig. 1-5, the reactor 1 may include a housing, an electrode mounting hole (hidden by the electrode 5 in the drawings, not directly shown), a water distribution line 12, and a reactor water outlet.
Wherein, the shell adopts a closed structure; also, the shape structure of the housing may be suitably set as required, such as a cylindrical shape or a polygonal cylindrical shape, etc.; in the present application, as shown in fig. 2, 3, and 5, the casing is provided in a cylindrical shape, which is more favorable for the rational arrangement of the subsequent electrodes 5 and the water distribution lines 12.
The electrode mounting hole of the reactor 1 is arranged on the bottom plate 101 of the shell in a penetrating way; the electrode mounting hole enables an electrode 5 of the microwave generating device to extend into the inner cavity of the shell, and the electrode 5 can be fixed; it will be appreciated that although the electrode 5 is perpendicular to the base plate 101 in the embodiment shown in fig. 4, this is not the only limitation on the angle at which the electrode 5 is disposed, and in other embodiments not shown, the electrode 5 may be at any suitable angle to the base plate 101, which also achieves the effect of generating plasma as described later; further, as shown in fig. 4, the specific fixing mode of the electrode 5 may be that the top end of the electrode 5 penetrates through the electrode mounting hole and then vertically extends into the inner cavity of the housing, and then the bottom of the electrode 5 is fixed to the electrode mounting hole (for example, in a threaded connection, an interference fit connection, or the like). It can also be understood that, because the organic wastewater is contained in the inner cavity of the housing, in order to further improve the sealing performance, other sealing treatments, such as installing a sealing ring, can be performed at the connection part of the electrode 5 and the electrode installation hole, which are not described in detail herein.
The water distribution pipeline 12 of the reactor 1 comprises a water distribution pipe water inlet and a water distribution pipe water outlet 13; the water inlet of the water distribution pipe is communicated with a water inlet pipeline 2 (a corresponding control valve can be arranged on the water inlet pipeline 2) positioned outside the shell, and the water outlet 13 of the water distribution pipe is communicated with the inner cavity of the shell, so that external organic wastewater can flow in from the water inlet of the water distribution pipe through the water inlet pipeline 2, then flow through the water distribution pipeline 12 and then enter the inner cavity of the shell of the reactor 1 from the water outlet 13 of the water distribution pipe; further, this application is around arbitrary electrode mounting hole, a plurality of water distributor delivery ports 13 of equal distribution to when making organic waste water flow into the casing inner chamber, can distribute more evenly around corresponding electrode 5, in order to improve plasma and produce efficiency.
It should also be noted that the water distribution lines 12 may be disposed in any suitable manner, such as extending along the side wall of the shell of the reactor 1 or disposed on the bottom plate 101; and, taking the arrangement on the bottom plate 101 as an example, there may be various ways, such as arranging the water distribution pipeline 12 on the inner side of the bottom plate 101 (i.e. the upper surface of the bottom plate 101 in fig. 1), or on the outer side of the bottom plate 101 (i.e. the lower surface of the bottom plate 101 in fig. 1), or arranging the bottom plate 101 in a sandwich manner, arranging the water distribution pipeline 12 in the sandwich manner, as long as it is satisfied that the water distribution inlet can communicate with the outer water inlet pipeline 2, and the water distribution outlet 13 communicates with the inner cavity of the housing.
As shown in fig. 5, in the present application, the water distribution pipeline 12 is fixedly disposed (the fixing manner may be welding, bonding, fastening connection, etc.) on the inner side surface of the bottom plate 101, the water inlet of the water distribution pipeline penetrates through the bottom plate 101 from inside to outside and then is communicated with the water inlet pipeline 2, and the water outlet 13 (itself located in the inner cavity of the housing) of the water distribution pipeline is disposed on the inner side surface of the bottom plate 101 around the corresponding electrode mounting hole; the arrangement mode of the water distribution pipeline 12 can reduce the number of the holes on the bottom plate 101 as much as possible, improve the structural stability and reduce the processing cost at the same time, and in addition, the main body part of the water distribution pipeline 12 is positioned in the inner cavity of the shell, so that the water distribution pipeline is not easy to damage, the service life is prolonged, and the maintenance cost is reduced. Other arrangements of the water distribution lines 12 will not be described in detail herein.
Further, as shown in fig. 1, the water outlet of the reactor is opened through the shell, and is preferably disposed on the shell near the top, and is communicated with the water outlet line 3 located outside the shell (the water outlet line 3 may also be provided with a corresponding control valve), so that the water after the reaction in the reactor 1 can be discharged through the water outlet line 3.
According to the treatment device for the high-salt-content degradation-resistant organic wastewater, the electrode 5 of the microwave generation device is arranged in the reactor, the microwave energy transmitted by the electrode 5 can quickly vaporize the liquid around the electrode 5 to generate bubbles, and the generated strong field acting force breaks down the bubbles, so that plasma (or called as discharge plasma) is generated around the tip of the electrode 5, the plasma contains a large amount of high-energy electrons, free radicals, ions and the like, and the high-energy electrons can directly collide with organic pollutants to enable the pollutants to be activated and in an excited state or even directly degraded; in addition, active substances generated by high-energy electron collision can directly oxidize and degrade organic pollutants; further, in addition to the active species induced by the collision of high-energy electrons, the discharge is accompanied by the effects of ultraviolet radiation, pyrolysis, ultrasound, etc., which are beneficial to the degradation of organic pollutants.
In conclusion, the discharge plasma of the application utilizes the physicochemical effect generated by discharge to jointly act on pollutants in organic wastewater, thereby realizing the degradation of organic matters in the high-salt environment and the conversion of organic matters difficult to biodegrade into organic matters easy to be microbially degraded, namely improving the BOD of effluent 5 a/COD value to improve the treatment efficiency of the subsequent microorganism treatment unit.
In addition, a plurality of water distribution pipe water outlets are distributed around each electrode 5, so that the organic wastewater around the electrodes 5 is distributed more uniformly, and the plasma generation efficiency and the organic wastewater treatment efficiency are further improved.
Further, as shown in fig. 6, in the treatment device for high-salt refractory organic wastewater of the present application, the reactor 1 may further include a perforated pipe 14.
Specifically, a perforated pipe 14 is communicated with each water distribution pipe water outlet 13 (the fixing mode can adopt a threaded connection mode, an interference fit mode and the like); wherein, one end of the perforated pipe 14 communicated with the water outlet 13 of the water distribution pipe is set as an open end, the other opposite end is set as a sealed end, and the pipe wall of the perforated pipe 14 is provided with a plurality of water outlet holes 15; in addition, referring to fig. 6, for the plurality of perforated tubes 14 distributed around any one of the electrode mounting holes, first, all the perforated tubes 14 are parallel to the electrodes 5 in the electrode mounting holes, and, for the convenience of arrangement and better treatment effect, it is defined herein that all the perforated tubes 14 and the electrodes 5 are perpendicular to the base plate 101; secondly, the water outlet holes 15 of all the perforated pipes 14 face (face) the electrode 5, so that the uniformity of the distribution of the organic wastewater around the electrode 5 can be further improved, and finally, the plasma generation efficiency and the organic wastewater treatment efficiency are higher.
It can be understood that the length of each perforated pipe 14, the number of the water outlet holes 15 included therein, the arrangement of the water outlet holes 15, and the aperture of each water outlet hole 15 can be set appropriately according to specific requirements; as shown in fig. 6, firstly the axial height of the perforated tube 14 is greater than the axial height of the electrode 5, about twice the axial height of the electrode 5; in addition, the number of the water outlet holes 15 in each perforated pipe 14 is 6, the water outlet holes are uniformly distributed along the axial direction, and the aperture of each water outlet hole 15 is 5-10mm; through perforated pipe 14 and 15's of apopore setting mode for organic waste water can be by supreme perforated pipe down, and loop through apopore 15 and reach 5 pointed ends of electrode, thereby further guarantee that the organic waste water of high salt is even fully to contact with electrode 5.
Further, in the treatment device for high-salt-content refractory organic wastewater, the arrangement modes of the water outlets 13 of the plurality of water distribution pipes around any one electrode mounting hole can be various, for example, the plurality of water distribution pipes are arranged around the corresponding electrode mounting hole in a queue or in a regular polygon shape; as shown in fig. 5, in the present application, in order to further make the distribution of the organic wastewater around the corresponding electrode 5 more uniform, the plurality of water distributor outlets 13 are uniformly distributed on a concentric circle with the corresponding electrode mounting hole as the center, and the distance from the concentric circle to the corresponding center is set to be 5-10cm.
Also, as for the number of the electrode mounting holes (i.e., including the corresponding electrodes 5 at the same time), appropriate setting may be made according to the size of the organic wastewater (or the amount of organic wastewater treated in a prescribed time) contained in the reactor 1; when the number of the electrode mounting holes is multiple, the arrangement mode of the multiple electrode mounting holes can be properly selected; referring to fig. 5, in the present application, on a circular (or other shapes) bottom plate 101, one of the electrode mounting holes is first disposed at the center of the circle of the bottom plate 101, and then the other electrode mounting holes are uniformly distributed on the concentric circle of the center of the circle, so that the arrangement mode can make the strong oxidation active particles generated by the electrode 5 more uniform, and effectively avoid the short circuit phenomenon in the treatment process.
Further, among the processing apparatus that is arranged in high salt content refractory organic waste water of this application, reactor 1 still includes exhaust hole, vacuum pump 8 and reactor outlet.
As shown in fig. 1, the exhaust hole is opened through the top of the housing (or other positions, where the top is the position with the best exhaust effect), and the vacuum pump 8 is communicated with the exhaust hole through an exhaust line 7; such an exhaust structure is capable of exhausting gas generated by the reaction in the reactor 1 in time, on the other hand, reducing the pressure of the gas phase in the reactor 1 by the vacuum pump 8, thereby facilitating the generation of bubbles and plasma in the reactor 1 to enhance the reaction efficiency.
The reactor water outlet is arranged at a position (also can be other positions) close to the bottom plate 101 on the shell in a penetrating way, and is communicated with the water outlet pipeline 3 positioned at the outer side of the shell through the emptying pipeline 4, and after the organic wastewater treatment is finished, residual liquid in the inner cavity of the reactor 1 can be emptied through the emptying pipeline 4.
In a second aspect, the application also discloses a treatment method for refractory organic wastewater with high salt content, which adopts the treatment device of any one of the first aspect to complete the following steps:
s101, controlling the high-salt-content degradation-resistant organic wastewater to flow into a water distribution pipeline 12 from a water inlet pipeline 2, and then flowing into an inner cavity of a shell of the reactor 1 from a plurality of water distribution pipe water outlets 13 of the water distribution pipeline 12, wherein the high-salt-content degradation-resistant organic wastewater flowing out of the plurality of water distribution pipe water outlets 13 can be uniformly distributed around corresponding electrodes 5.
It can be understood that, when the outlet 13 of the water distributor is further provided with the perforated pipe 14 and the perforated pipe 14 is provided with the water outlet hole 15, the organic wastewater is distributed uniformly around the electrode 5 after passing through the outlet 13 of the water distributor, the perforated pipe 14 and the water outlet hole 15 in sequence.
S102, simultaneously adjusting the output power of the microwave generating device, injecting microwave energy into the organic wastewater in the reactor 1 from the electrode 5 through the waveguide assembly 9 and the coaxial cable 6 to rapidly vaporize the liquid around the electrode 5 to generate bubbles, and simultaneously generating strong field acting force to break down the bubbles to generate plasma around the tip of the electrode 5 so as to generate a large amount of active particles, such as ozone, free oxygen, hydroxyl radicals and the like, in the liquid phase around the electrode 5, thereby oxidatively degrading the organic pollutants in the wastewater.
The treatment device and the treatment method for high-salt-content refractory organic wastewater of the present application will be further described with 2 specific application examples.
Application example 1:
the high-concentration pharmaceutical wastewater generated in a certain pharmaceutical park has the COD content of 22900mg/L and the TDS content of 57000mg/L, so the high-concentration pharmaceutical wastewater belongs to high-salt-content nonbiodegradable organic wastewater.
The treatment process and the results of the treatment device are as follows:
adjusting the power of the microwave generator to make the output power reach 200W, and continuously operating for 30min to obtain the COD content of 5250mg/L, wherein the COD removal efficiency is 77.07%.
Further, see table 1 below, which is a result of applying conventional wet oxidation treatment to the high-salt-content nonbiodegradable organic wastewater with the same proportion of components; as can be seen by comparison, the COD removal effect after the treatment device and the treatment process are close to the treatment result of the wet oxidation treatment method with the temperature of 250 ℃ and the pressure of 4.2 MPa; however, it should be emphasized that the treatment process of the treatment apparatus of the present application only needs to be performed at normal temperature and normal pressure, and in the wet oxidation treatment method, even the lowest temperature (180 °) is much higher than the environmental temperature of the treatment process of the present application, and in the case of the lowest temperature, the COD removal rate can only reach 34.14, which is far lower than the treatment effect of the treatment apparatus of the present application under normal temperature conditions.
TABLE 1 Wet Oxidation treatment results
Application example 2:
chemical wastewater generated in a certain chemical industry park has the COD content of 17000mg/L, the TDS content of 98000mg/L and the Cl-content of 11300mg/L, so the chemical wastewater belongs to high-salt-content organic wastewater difficult to biodegrade, and has high chloride ion content and high treatment difficulty.
The treatment process and the results of the treatment device are as follows:
adjusting the power of the microwave generator to enable the output power to reach 500W, and after the operation is continuously carried out for 30min, measuring that the COD is 2150mg/L, wherein the removal rate of the COD is 87.35%.
Further, the high-salinity biodegradable organic wastewater with the same proportion of components is subjected to traditional wet oxidation treatment; by contrast, the COD removal effect after the treatment device and the treatment process are close to the treatment result of the wet oxidation treatment method with the temperature of 250 ℃ and the pressure of 4.2 MPa; but also needs to be emphasized that the treatment process of the treatment device only needs to be carried out at normal temperature and normal pressure; in addition, the equipment for wet oxidation, especially under the condition of high temperature, the equipment for wet oxidation is severely corroded by high-content chloride ions in the organic wastewater, and the treatment device can avoid the corrosion problem.
According to the two application examples, the treatment device and the treatment method for the high-salt-content degradation-resistant organic wastewater have the advantages that the requirement on treatment environment is lower, the safety performance is improved, the treatment cost is reduced, in addition, the treatment efficiency of the treatment device and the treatment method are higher under the same environmental condition, and the applicability is stronger.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A treatment plant for refractory organic wastewater containing high salt content, comprising a microwave generation device and a reactor (1), the microwave generation device comprising at least one electrode (5) for generating microwave plasma, characterized in that the reactor (1) comprises:
a closed housing;
the electrode mounting holes penetrate through a bottom plate (101) of the shell, and one electrode (5) extends into the inner cavity of the shell through one corresponding electrode mounting hole and is fixed on the electrode mounting hole;
the water distribution pipeline (12) comprises a water distribution pipe water inlet and a water distribution pipe water outlet (13), the water distribution pipe water inlet is communicated with the water inlet pipeline (2) positioned outside the shell, the water distribution pipe water outlet (13) is communicated to the inner cavity of the shell, and a plurality of water distribution pipe water outlets (13) are uniformly distributed around each electrode mounting hole;
the water outlet of the reactor penetrates through the shell and is communicated with a water outlet pipeline (3) positioned outside the shell;
a plurality of water distribution pipe water outlets (13) are uniformly distributed on a concentric circle taking the electrode mounting hole as the center of a circle around any one electrode mounting hole; each water distribution pipe water outlet (13) is communicated with a perforated pipe (14), wherein one end of each perforated pipe (14) communicated with the water distribution pipe water outlet (13) is an open end, the other opposite end of each perforated pipe is a sealed end, and the pipe wall of each perforated pipe (14) is provided with a plurality of water outlet holes (15); and
the plurality of perforated pipes (14) distributed around each electrode mounting hole are parallel to the electrodes (5) in the electrode mounting hole and are perpendicular to the bottom plate (101), and the plurality of water outlet holes (15) in each perforated pipe (14) face the corresponding electrodes (5).
2. The device for treating the refractory organic wastewater containing high salt content according to claim 1, wherein the housing is cylindrical, and the number of the electrodes (5) and the corresponding electrode mounting holes is multiple, wherein one electrode mounting hole is arranged at the center of the bottom plate (101), and the other electrode mounting holes are uniformly distributed on a concentric circle of the center.
3. The treatment device for the high-salt-content degradation-resistant organic wastewater as claimed in claim 1, wherein the distances from the water outlets (13) of the plurality of water distribution pipes on the same concentric circle to the corresponding circle center are 5-10cm; and
the axial height of the perforated pipe (14) is larger than that of the electrode (5), and the aperture of a water outlet hole (15) in the perforated pipe (14) is 5-10mm.
4. The treatment device for the refractory organic wastewater containing high salt content according to claim 1, wherein the water distribution pipeline (12) is arranged on the inner side surface of the bottom plate (101), the water distribution inlet thereof penetrates through the bottom plate (101) from inside to outside and then is communicated with the water inlet pipeline (2), and the water distribution outlet (13) thereof is distributed on the inner side surface of the bottom plate (101) around the corresponding electrode mounting hole.
5. The apparatus for treating refractory organic wastewater containing high salt content according to claim 1, wherein the reactor (1) further comprises:
the exhaust hole penetrates through the top of the shell;
a vacuum pump (8), the vacuum pump (8) being connected to the exhaust vent by an exhaust line (7).
6. The apparatus for treating refractory organic wastewater containing high salt content according to claim 1, wherein the reactor (1) further comprises:
the reactor water outlet penetrates through the position, close to the bottom plate (101), of the shell and is communicated with a water outlet pipeline (3) positioned on the outer side of the shell and an emptying pipeline (4).
7. The apparatus for treating refractory organic wastewater containing high salt content according to claim 1, wherein the microwave generator further comprises a power supply (11), a microwave generator (10) and a waveguide assembly (9) which are electrically connected in sequence, and the waveguide assembly (9) is connected with the electrode (5) through a coaxial cable (6).
8. A treatment method for refractory organic wastewater with high salt content is characterized in that the following steps are carried out by adopting the treatment device of any one of claims 1 to 7:
controlling the high-salt-content refractory organic wastewater to flow into a water distribution pipeline (12) from a water inlet pipeline (2), and then flowing into an inner cavity of a shell of the reactor (1) from a plurality of water distribution pipe water outlets (13) of the water distribution pipeline (12), wherein the high-salt-content refractory organic wastewater flowing out of the plurality of water distribution pipe water outlets (13) can be uniformly distributed around corresponding electrodes (5);
and simultaneously, the output power of the microwave generating device is adjusted, so that microwave energy is injected into the high-salt-content refractory organic wastewater uniformly distributed around through the electrodes (5) to generate microwave plasmas, and then the pollutants in the high-salt-content refractory organic wastewater are treated through the microwave plasmas.
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