Artificial wetland-based device and method for misting treatment of aquaculture tail water

Abstract

The application discloses an aquaculture tail water atomization treatment device based on an artificial wetland, which comprises a tail water pretreatment assembly, a tail water atomization supercritical combination assembly and an artificial wetland assembly; the tail water pretreatment assembly comprises a tail water storage pool, a filter screen arranged in the tail water storage pool and a tail water concentration evaporator connected with the tail water storage pool; the tail water atomization supercritical combination assembly comprises a supercritical water preparation unit and a combination reaction cabin connected with the supercritical water preparation unit; the combination reaction cabin is used for atomizing tail water and mixing the tail water with supercritical water, and comprises a cabin body, an atomization spray head arranged at the top of the cabin body and a jet spray head arranged at the bottom of the cabin body; and the artificial wetland assembly is used for biologically adsorbing and treating tail water combined with supercritical water. The application further discloses an aquaculture tail water atomization treatment method based on an artificial wetland, which combines supercritical water and artificial wetland technologies, and realizes efficient and environmentally-friendly removal of organic matters in aquaculture tail water.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aquaculture tail water treatment, and particularly relates to an aquaculture tail water atomization treatment device and method based on an artificial wetland. BACKGROUND

[0002] With the rapid development of the aquaculture industry, aquaculture tail water treatment has become an increasingly serious problem. The tail water contains a large amount of organic matter, inorganic salt and other harmful substances. If it is not effectively treated and directly discharged, it will cause serious pollution to the water environment and affect the ecological balance and human health.

[0003] In the prior art, the traditional tail water treatment method mainly includes physical method, chemical method and biological method. The physical method such as sedimentation and filtration is simple and easy to operate, but the treatment effect is limited and it is difficult to completely remove the dissolved large amount of organic matter in the tail water. The chemical method has good removal effect, but often causes secondary pollution and has high treatment cost. The biological method is environmentally friendly, but has a long treatment period, large land occupation and high water quality requirement for tail water, which limits the application scene.

[0004] In recent years, the concept of artificial wetland has gradually emerged. The artificial wetland is an artificial ecological system simulating natural wetlands, which is artificially constructed and controlled and consists of ground similar to marshes. Its structure usually includes stone sand, soil, coal cinder and other media, and selectively plants are planted to form a wastewater treatment ecosystem. In terms of wastewater treatment, artificial wetlands have multiple benefits. Artificial wetlands can efficiently purify wastewater through the physical, chemical and biological triple synergistic effects of soil, artificial media, plants and microorganisms. This process includes adsorption, retention, filtration, oxidation-reduction, sedimentation, microbial decomposition and transformation, thereby achieving effective treatment of wastewater and sludge. However, the artificial wetland is still limited in terms of wastewater treatment rate, and the high concentration of organic matter in the tail water may also damage the artificial wetland.

[0005] Therefore, there is a need for a new technical solution to solve the problems in the prior art. SUMMARY

[0006] The present application overcomes the shortcomings of the prior art and provides an aquaculture tail water atomization treatment device and method based on an artificial wetland.

[0007] To achieve the above purpose, the technical scheme adopted by the present application is as follows: an aquaculture tail water atomization treatment device based on an artificial wetland, comprising: a tail water pretreatment assembly, a tail water atomization supercritical combination assembly connected with the tail water pretreatment assembly, and an artificial wetland assembly connected with the tail water atomization supercritical combination assembly.

[0008] The tail water pretreatment assembly comprises a tail water storage tank, a filter screen arranged in the tail water storage tank, and a tail water concentration evaporator connected with the tail water storage tank.

[0009] The tail water atomization supercritical combination assembly comprises a supercritical water preparation unit and a combination reaction cabin connected with the supercritical water preparation unit.

[0010] The combination reaction cabin is used for atomizing the tail water and mixing the tail water with supercritical water, and comprises a cabin body, an atomization nozzle arranged at the top of the cabin body, and a jet nozzle arranged at the bottom of the cabin body; the atomization nozzle is connected with the tail water concentration evaporator, and the jet nozzle is connected with the supercritical water preparation unit.

[0011] The artificial wetland assembly is connected with the combination reaction cabin and is used for biologically adsorbing and treating the tail water combined with the supercritical water.

[0012] In a preferred embodiment of the present application, one end of the tail water storage tank is connected with a water inlet pipe, and the other end is connected with a first water pump; the first water pump is connected with the tail water concentration evaporator.

[0013] In a preferred embodiment of the present application, the tail water concentration evaporator comprises a concentration kettle, a concentration inlet valve and an exhaust valve arranged at the top end of the concentration kettle, a concentration outlet valve arranged at the bottom of the concentration kettle, and a plurality of evaporation electric heating wires arranged in the concentration kettle; the concentration inlet valve is connected with the first water pump, and the exhaust valve is connected with a tail gas collection and treatment unit.

[0014] In a preferred embodiment of the present application, the concentration outlet valve is connected with a second water pump, and the second water pump is connected with the atomization nozzle.

[0015] In a preferred embodiment of the present application, the supercritical water preparation unit comprises a high-pressure reaction kettle, a plurality of electric heating pipes arranged on the side wall of the high-pressure reaction kettle in a circumferential direction, a pressure control valve and a supercritical outlet valve arranged at the top of the high-pressure reaction kettle; the pressure control valve is connected with a gas booster, the supercritical outlet valve is connected with a first supercritical water pump, and the first supercritical water pump is connected with the jet nozzle.

[0016] In a preferred embodiment of the present application, the bottom of the combination reaction cabin is provided with a combination outlet valve, the combination outlet valve is connected with a second supercritical water pump, the second supercritical water pump is connected with a cooling unit, and the cooling unit is connected with the artificial wetland assembly.

[0017] In a preferred embodiment of the present application, the artificial wetland assembly comprises: an artificial wetland pool, a substrate layer arranged inside the artificial wetland pool, a microbial layer arranged above the substrate layer, a wetland plant layer arranged above the microbial layer, and a plurality of water storage tanks arranged inside the artificial wetland pool.

[0018] In a preferred embodiment of the present application, the artificial wetland pool is provided with a tail water supply pipe at one end and a discharge water valve at the other end; one end of the tail water supply pipe is connected to the cooling unit, and the other end is connected to a plurality of the water storage tanks.

[0019] An artificial wetland-based aquaculture tail water atomization treatment method based on any one of the artificial wetland-based aquaculture tail water atomization treatment devices described above, comprising the following steps:

[0020] S1, tail water collection and filtration: the tail water is discharged into the tail water storage tank through the water delivery pipe, and the filter screen is used to filter and remove the large particle solid impurities in the tail water;

[0021] S2, tail water evaporation and concentration: the filtered tail water is delivered to the tail water concentration evaporator, and the organic matter concentration in the tail water is concentrated to 1100-1500 mg / L by heating and evaporation;

[0022] S3, supercritical water preparation: the pure water is heated and pressurized in the high-pressure reaction kettle by the supercritical water preparation unit to prepare supercritical water;

[0023] S4, tail water atomization and supercritical combination: the concentrated tail water is atomized and sprayed out through the atomizing nozzle, and the atomized particle size is controlled to be 80-200 μm; the supercritical water is sprayed out to the combination reaction cabin through the jet nozzle, mixed with the atomized tail water, oxidizes the organic matter in the tail water, and reduces the concentration of the organic matter in the tail water;

[0024] S5, artificial wetland treatment: the tail water combined with the supercritical water is delivered to the artificial wetland, and the residual organic matter and inorganic salt in the tail water are sequentially treated by biological adsorption through the wetland plants, microbial communities and substrates in the artificial wetland, and the concentration of the organic matter in the tail water is reduced again before being discharged.

[0025] In a preferred embodiment of the present application, in the S3, the temperature of the pure water is heated to 374-680℃, and the gas pressure in the high-pressure reaction kettle is pressurized to 22.1-27.5 MPa during the preparation of the supercritical water.

[0026] The present application solves the defects in the background art, and has the following beneficial effects:

[0027] (1) The application provides a kind of based on artificial wetland aquaculture tail water atomization processing device and method, in the basis of aquaculture tail water atomization processing, supercritical water technology and artificial wetland technology are combined, it can utilize the strong oxidizing property of supercritical water, quickly reduce the concentration of organic matter in tail water, prevent damage to artificial wetland;At the same time, through the biological adsorption of artificial wetland, residual organic matter and inorganic salt in tail water can be further removed, so that the environment-friendly and efficient aquaculture tail water can be treated, the processing rate is greatly improved.

[0028] (2)The application discloses an artificial wetland-based aquaculture tail water atomization treatment device, which can atomize the tail water and control the spray particle size of the atomized tail water to be 80-200 microns through the combined reaction cabin, thereby improving the contact area with supercritical water, and further improving the reaction rate and reaction effect, so as to improve the removal rate of organic matter in the tail water.

[0029] (3)In the artificial wetland-based aquaculture tail water atomization treatment method provided by the application, the tail water is evaporated and concentrated before being combined with supercritical water, so that the concentration of organic matter in the tail water is controlled to be 1100-1500 mg / L, which can not only increase the contact area between supercritical water and organic matter and improve the reaction rate, but also reduce the competition between reactants and side reactions caused by excessively high organic matter concentration, avoid the decrease of reaction rate, and ensure the treatment efficiency.

[0030] (4)The artificial wetland-based aquaculture tail water atomization treatment device and method provided by the application can filter and concentrate the tail water, then mix the tail water with supercritical water, and finally reprocess the tail water through artificial wetland, which not only can improve the removal rate of organic matter in the tail water, but also can save resources, avoid waste of resources caused by excessive concentration of tail water and excessive supply of supercritical water, and improve the environmental protection and energy saving. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor;

[0032] Figure 1 is a three-dimensional structure diagram of the aquaculture tail water treatment device of the preferred embodiment of the application;

[0033] Figure 2 is a flow chart of the aquaculture tail water treatment method of the preferred embodiment of the application;

[0034] Figure: 1, tail water storage tank; 2, tail water concentration evaporator; 3, combined reaction cabin; 4, supercritical water preparation unit; 5, constructed wetland assembly. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0036] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced without the specific details, other than those described herein, and therefore the scope of the application is not limited to the details of the following description.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0038] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0039] As Figure 1As shown, a kind of artificial wetland-based aquaculture tail water atomization processing device, including: a kind of artificial wetland-based aquaculture tail water atomization processing device, including: tail water pretreatment component, tail water atomization supercritical combination component connected with tail water pretreatment component, and artificial wetland component 5 connected with tail water atomization supercritical combination component.

[0040] In the application, the tail water pretreatment component includes: a tail water storage tank 1, a filter screen arranged in the tail water storage tank 1, and a tail water concentration evaporator 2 connected with the tail water storage tank 1; one end of the tail water storage tank 1 is connected with a water inlet pipe, and the other end is connected with a first water pump; the first water pump is connected with the tail water concentration evaporator 2; the tail water concentration evaporator 2 includes: a concentration kettle, a concentration inlet valve and an exhaust valve arranged at the top end of the concentration kettle, a concentration outlet valve arranged at the bottom of the concentration kettle, and a plurality of evaporation electric heating wires arranged in the concentration kettle; the concentration inlet valve is connected with the first water pump, and the exhaust valve is connected with a tail gas collection and treatment unit. The concentration outlet valve is connected with a second water pump, and the second water pump is connected with an atomization nozzle.

[0041] In the application, the tail water atomization supercritical combination component includes: a supercritical water preparation unit 4 and a combination reaction cabin 3 connected with the supercritical water preparation unit 4; the supercritical water preparation unit 4 includes: a high-pressure reaction kettle, a plurality of electric heating pipes arranged on the side wall of the high-pressure reaction kettle in a circumferential direction, a pressure control valve arranged at the top of the high-pressure reaction kettle, and a supercritical water outlet valve; the pressure control valve is connected with a gas booster, the supercritical water outlet valve is connected with a first supercritical water pump, and the first supercritical water pump is connected with a jet nozzle.

[0042] In the application, the combination reaction cabin 3 is used for atomizing tail water and mixing the tail water with supercritical water, and includes: a cabin body, an atomization nozzle arranged at the top inside the cabin body, and a jet nozzle arranged at the bottom inside the cabin body; the atomization nozzle is connected with the tail water concentration evaporator 2, and the jet nozzle is connected with the supercritical water preparation unit 4; the bottom of the combination reaction cabin 3 is provided with a combination water outlet valve, the combination water outlet valve is connected with a second supercritical water pump, the second supercritical water pump is connected with a cooling unit, and the cooling unit is connected with the artificial wetland component 5.

[0043] In the application, the artificial wetland component 5 is connected with the combination reaction cabin 3 and is used for biologically adsorbing and treating tail water combined with supercritical water; the artificial wetland component 5 includes: an artificial wetland tank, a substrate layer arranged inside the artificial wetland tank, a microorganism layer arranged above the substrate layer, a wetland plant layer arranged above the microorganism layer, and a plurality of water storage tanks arranged inside the artificial wetland tank; one end of the artificial wetland tank is provided with a tail water supply pipe, and the other end is provided with a discharge water outlet valve; one end of the tail water supply pipe is connected with the cooling unit, and the other end is connected with the plurality of water storage tanks.

[0044] As Figure 2As shown, a water production tail water atomization treatment method based on artificial wetland, based on the above-mentioned water production tail water atomization treatment device based on artificial wetland, comprising the following steps:

[0045] S1, tail water collection and filtration: the tail water is discharged into the tail water storage tank 1 through the water inlet pipe, and the filter screen is used to filter and remove the large particle solid impurities in the tail water;

[0046] S2, tail water evaporation concentration: the filtered tail water is transported to the tail water concentration evaporator 2, and the organic matter concentration in the tail water is concentrated to 1100-1500mg / L by heating and evaporation;

[0047] S3, supercritical water preparation: the pure water is heated and pressurized in the high-pressure reaction kettle by the supercritical water preparation unit 4, and the supercritical water is prepared;

[0048] S4, tail water atomization supercritical combination: the concentrated tail water is atomized and sprayed out through the atomizing nozzle, and the atomized particle size is controlled at 80-200μm; the supercritical water is sprayed out to the combination reaction cabin 3 through the jet nozzle, mixed with the atomized tail water, and the organic matter in the tail water is oxidized, so that the organic matter concentration in the tail water is reduced, i.e. the organic matter concentration is lower than 50mg / L;

[0049] S5, artificial wetland treatment: the artificial wetland is preferably a surface flow artificial wetland, the tail water combined with the supercritical water is transported to the artificial wetland, and the residual organic matter and inorganic salt in the tail water are treated by biological adsorption in turn through the wetland plants, microbial community and substrate in the artificial wetland, so that the organic matter concentration in the tail water is reduced again, i.e. the organic matter concentration is lower than 15mg / L, which meets the discharge standard, and the discharge standard is selected from the freshwater receiving water area aquaculture tail water discharge limit value in DB32 / 4043-2021.

[0050] It is worth noting that in S3, the temperature of the pure water is heated to 374-680℃, and the gas pressure in the high-pressure reaction kettle is pressurized to 22.1-27.5MPa during the preparation of supercritical water.

[0051] It is worth noting that supercritical water refers to the state of water when the temperature and pressure exceed its critical point, i.e. the temperature is above 374℃ and the pressure is above 22.1MPa. At this time, the water has unique physical and chemical properties, i.e. strong oxidizing property, density close to gas, large diffusion coefficient and small viscosity, so that the organic matter is more easily oxidized and decomposed in supercritical water, thereby treating the wastewater containing organic matter without pollution.

[0052] Example one

[0053] Step one, measure the initial organic matter concentration of tail water, 200L tail water is discharged into the tail water storage tank 1 through the water pipe, and the filter screen with a pore size of 5mm is used to filter and remove the large particle solid impurities in the tail water;

[0054] Step two, the filtered tail water is transported to the tail water concentration evaporator 2 with a heating power of 5kW, and the organic matter concentration in the tail water is concentrated to 1200mg / L by heating and evaporation;

[0055] Step three, the pure water is heated and pressurized in the high-pressure reaction kettle to prepare supercritical water by the supercritical water preparation unit 4; specifically, the temperature is 600℃, and the pressure is 27.1MPa;

[0056] Specifically, the selected high-pressure reaction kettle has a volume of 10L, the electric heating power is 3kW, the gas booster pressure range is 20-30MPa, and the combined reaction cabin 3 has a volume of 20L;

[0057] Step four, the concentrated tail water is atomized and sprayed out through the atomizing nozzle, and the atomized particle size is controlled to be 100μm; the supercritical water is sprayed out to the combined reaction cabin 3 through the jet nozzle, mixed with the atomized tail water, and the organic matter in the tail water is oxidized, and the reaction time is controlled to be 10min each time until the 200L tail water is completely reacted;

[0058] Step five, the tail water after reaction is transported to the constructed wetland, and after standing for 2 hours, the residual concentration of organic pollutants in the soil is measured, and the removal rate of organic matter is calculated; wherein the calculation formula of the removal rate of organic matter is:

[0059]

[0060] Wherein, H is the removal rate of organic matter, C t represents the residual concentration of organic pollutants in the soil, and C0 represents the initial residual concentration of organic pollutants in the tail water.

[0061] Specifically, the constructed wetland is selected to be an area of 3㎡, the substrate layer is a mixture of sand, soil and stone with a thickness of 20cm, the microbial layer is river mud with a thickness of 10cm, and the surface flow constructed wetland is planted with aquatic plants.

[0062] Example two

[0063] Based on example one, the difference in the experimental process is that in step three, the supercritical water temperature is 550℃, and the pressure is 27.1MPa.

[0064] Example three

[0065] Based on Example One, the difference in the experimental process is that in Step Three, the supercritical water temperature is 600℃, and the pressure is 27.5 MPa.

[0066] Example Four

[0067] Based on Example One, the difference in the experimental process is that in Step Three, the supercritical water temperature is 680℃, and the pressure is 27 MPa.

[0068] Example Five

[0069] Based on Example One, the difference in the experimental process is that in Step Two, the concentration of organic matter after concentration of tail water is 1100 mg / L.

[0070] Example Six

[0071] Based on Example One, the difference in the experimental process is that in Step Two, the concentration of organic matter after concentration of tail water is 1500 mg / L.

[0072] Example Seven

[0073] Based on Example One, the difference in the experimental process is that in Step Four, the atomized particle size is controlled at 80 μm.

[0074] Example Eight

[0075] Based on Example One, the difference in the experimental process is that in Step Four, the atomized particle size is controlled at 150 μm.

[0076] Comparative Example One

[0077] Based on Example One, the difference in the experimental process is that Step Two of tail water concentration is not performed, and is directly combined with supercritical water atomization.

[0078] Comparative Example Two

[0079] Based on Example One, the difference in the experimental process is that after concentration of tail water, Step Four of atomization combination is not performed, and is directly mixed with supercritical water in the form of jet in the combination reaction cabin 3 for 10 min.

[0080] Comparative Example Three

[0081] Based on Example One, the difference in the experimental process is that Step Three and Step Four are not performed, and the tail water after concentration is directly transported to the artificial wetland.

[0082] The experimental data in the above examples and comparative examples are integrated, and the test results of the removal rate of organic matter in the tail water are shown in Table 1.

[0083]

[0084]

[0085] Table 1. Experimental data of water production tail water treatment method at different steps

[0086] In summary, based on the experimental data shown above, the present application provides a water production tail water treatment method, which concentrates the organic matter in the tail water to 1200 mg / L, controls the atomized particle size to 100 μm, and controls the temperature and pressure of supercritical water to 600℃ and 27.1 MPa, respectively, to achieve the best removal rate of organic matter. Under these conditions or similar conditions, the present application can efficiently remove the organic matter in the water production tail water in an environmentally friendly manner, reduce the concentration of organic matter, and make it meet the discharge standard, while also having economic value and ecological value.

[0087] It is worth noting that regarding the change in organic matter concentration, when the organic matter concentration increases, the collision frequency between organic matter molecules and oxidant molecules in supercritical water also increases. Because the number of organic matter molecules in a unit volume increases, the opportunity for them to meet and collide with oxidant molecules increases. The increase in collision frequency means that more organic matter molecules have the opportunity to react with oxidant molecules, thereby increasing the reaction rate and improving the removal rate of organic matter. However, when the concentration is too high, the high concentration of organic matter will lead to competition between reactants and also produce side reactions, thereby reducing the efficiency of tail water organic matter treatment.

[0088] It is worth noting that regarding the change in spray particle size, the smaller the spray, the larger the specific surface area, and the contact area between organic matter and supercritical water also increases, which helps to improve the reaction rate. However, if the spray particle size is too small, the particles will agglomerate due to van der Waals forces, electrostatic forces, and other interactions between them, forming larger particle groups. This agglomeration phenomenon reduces the total surface area of the particles, thereby reducing the effective contact area with supercritical water and leading to a decrease in reaction rate. At the same time, too small particles increase the mass transfer resistance. In the supercritical water oxidation process, oxygen needs to be transferred from supercritical water to the surface of organic particles to react. If the particles are too small, the residence time of oxygen on the particle surface may decrease, leading to a decrease in mass transfer efficiency and affecting the reaction rate.

[0089] It is worth noting that regarding the temperature and pressure of supercritical water, due to the different properties of tail water, the physical and chemical properties of supercritical water at different temperatures and pressures are also different, and thus the reactivity of tail water is also different. Therefore, the removal rate of organic matter in water production tail water by supercritical water at different temperatures and pressures is not the same. The optimal treatment temperature and pressure of supercritical water obtained by the present application are derived from the tail water in the laboratory test environment. In actual use, the optimal treatment temperature and pressure of supercritical water can be obtained based on historical experimental data.

[0090] The above is based on the ideal embodiment of the application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the application. The technical scope of the application is not limited to the content of the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A treatment method of an artificial wetland-based water production farming tail water atomization treatment device, characterized by, The processing device comprises: a tail water pretreatment assembly, a tail water atomization supercritical combination assembly connected with the tail water pretreatment assembly, and an artificial wetland assembly connected with the tail water atomization supercritical combination assembly; The tail water pretreatment assembly comprises: a tail water storage tank, a filter screen arranged in the tail water storage tank, and a tail water concentration evaporator connected with the tail water storage tank; The tail water atomization supercritical combination assembly comprises: a supercritical water preparation unit and a combination reaction cabin connected with the supercritical water preparation unit; The combination reaction cabin is used for atomizing tail water and mixing the tail water with supercritical water, and comprises: a cabin body, an atomization nozzle arranged at the top of the cabin body, and a jet nozzle arranged at the bottom of the cabin body; the atomization nozzle is connected with the tail water concentration evaporator, and the jet nozzle is connected with the supercritical water preparation unit; The artificial wetland assembly is connected with the combination reaction cabin and is used for biologically adsorbing tail water combined with supercritical water; The processing method comprises the following steps: S1, tail water collection and filtration: tail water is discharged into a tail water storage tank through a water inlet pipe, and large-particle solid impurities in the tail water are filtered and removed by using a filter screen; S2, tail water evaporation and concentration: filtered tail water is transported to a tail water concentration evaporator, and organic matter in the tail water is concentrated to 1100-1500 mg / L by heating and evaporation; S3, supercritical water preparation: pure water is heated and pressurized in a high-pressure reaction kettle by using a supercritical water preparation unit to prepare supercritical water; S4, tail water atomization supercritical combination: concentrated tail water is atomized and sprayed out by using an atomization nozzle, and the atomization particle size is controlled to be 80-200 μm; supercritical water is sprayed out to the combination reaction cabin by using a jet nozzle, mixed with the atomized tail water, and used for oxidizing organic matter in the tail water to reduce the concentration of the organic matter in the tail water; S5, artificial wetland treatment: tail water combined with supercritical water is transported to an artificial wetland, and residual organic matter and inorganic salts in the tail water are sequentially biologically adsorbed by using wetland plants, microbial communities and substrates in the artificial wetland, and the concentration of the organic matter in the tail water is reduced again before being discharged.

2. The treatment method of claim 1, wherein: One end of the tail water storage tank is connected with a water inlet pipe, and the other end is connected with a first water pump; the first water pump is connected with the tail water concentration evaporator.

3. The treatment method of claim 2, wherein: The tail water concentration evaporator comprises: a concentration kettle, a concentration inlet valve and an exhaust valve arranged at the top end of the concentration kettle, a concentration outlet valve arranged at the bottom of the concentration kettle, and a plurality of evaporation electric heating wires arranged in the concentration kettle; the concentration inlet valve is connected with the first water pump, and the exhaust valve is connected with a tail gas collection and treatment unit.

4. The treatment method of claim 3, wherein: The concentration outlet valve is connected with a second water pump, and the second water pump is connected with the atomization nozzle.

5. The treatment method of claim 1, wherein: The supercritical water preparation unit comprises: a high-pressure reaction kettle, a plurality of electric heating pipes arranged on the side wall of the high-pressure reaction kettle in a circumferential direction, a pressure control valve arranged at the top of the high-pressure reaction kettle, and a supercritical outlet valve; the pressure control valve is connected with a gas booster, the supercritical outlet valve is connected with a first supercritical water pump, and the first supercritical water pump is connected with the jet nozzle.

6. The treatment method of claim 1, wherein: The bottom of the combination reaction cabin is provided with a combined outlet valve, the combined outlet valve is connected with a second supercritical water pump, the second supercritical water pump is connected with a cooling unit, and the cooling unit is connected with the artificial wetland assembly.

7. The treatment method of claim 6, wherein: The artificial wetland assembly comprises an artificial wetland pool, a substrate layer arranged inside the artificial wetland pool, a microorganism layer arranged above the substrate layer, a wetland plant layer arranged above the microorganism layer, and a plurality of water storage tanks arranged inside the artificial wetland pool.

8. The treatment method of claim 7, wherein: One end of the tail water supply pipe is connected with the cooling unit, and the other end of the tail water supply pipe is connected with the plurality of water storage tanks.

9. The method of claim 1, wherein: In the S3, in the preparation process of supercritical water, the temperature of pure water is heated to 374-680 DEG C, and the gas pressure in the high-pressure reaction kettle is pressurized to 22.1-27.5 MPa.

Images