CN117699903A - Method and system for removing organic pollutants in reverse osmosis concentrate of coking wastewater based on electron beam irradiation process - Google Patents

Abstract

The invention provides a method and a system for removing organic pollutants in coking wastewater reverse osmosis concentrated solution based on an electron beam irradiation process, wherein the method comprises the following steps: the RO concentrated solution sequentially passes through a high-dose electron beam irradiation unit, an electro-adsorption treatment unit and a low-dose electron beam irradiation unit, and when passing through the high-dose electron beam irradiation unit, salt substances in the RO concentrated solution are ionized into hydrated electrons and oxidative free radicals by high-dose irradiation, so that quenching of the oxidative free radicals generated in the irradiation process by the salt substances is effectively reduced, and meanwhile, the removal of organic pollutants in the reverse osmosis concentrated solution is enhanced, and when water passes through the electro-adsorption treatment unit, the salt ions are removed by adsorption under the action of an electric field; when the effluent further passes through the low-dose electron beam irradiation unit, organic pollutants in the effluent are decomposed and removed by the low-dose electron beam irradiation, and the effluent can be further returned to the electric adsorption treatment unit for cyclic treatment until COD (chemical oxygen demand) in the effluent of the low-dose electron beam irradiation unit is less than or equal to 10mg/L.

Description

Removal of organic pollution from coking wastewater reverse osmosis concentrate based on electron beam irradiation process methods and systems

Technical field

The present invention relates to the technical field of wastewater treatment, and in particular to a method and system for removing organic pollutants in reverse osmosis concentrate of coked wastewater based on electron beam irradiation technology.

Background technique

Coking wastewater has the characteristics of complex pollutant composition, high concentration and difficulty in biodegradation. It is a kind of industrial wastewater that is difficult to treat. Biochemical treatment is one of the most widely used treatment processes in the field of industrial wastewater treatment. However, biological treatment processes cannot effectively remove toxic, harmful, and refractory organic pollutants in coking wastewater. This results in the treated effluent being unable to meet the requirements for direct discharge.

In response to the above problems, at present, an advanced treatment process is usually added after biochemical treatment to improve the treatment effect. Advanced oxidation processes, such as Fenton and ozone oxidation, are one of the commonly used advanced treatment processes. Although the advanced oxidation process can further reduce the organic pollutants in the biochemical effluent, the effluent indicators still cannot meet the requirements for reuse. In order to improve the wastewater reuse rate and achieve the goal of "zero discharge", advanced oxidation technology coupled with membrane technology is commonly used in practice. The use of membrane processes produces membrane concentrates. Membrane concentrate has the characteristics of high salt and high COD. The treatment of membrane concentrate is faced with the problem that the presence of high salt significantly affects the removal of organic pollutants in the membrane concentrate, resulting in the existing wastewater treatment process having an ineffective treatment effect on the membrane concentrate.

Electron beam irradiation is a new advanced oxidation technology. The main principle of wastewater treatment is to remove pollutants by relying on the direct action (energy deposition) of electron beams and the indirect action of active species produced by activating water molecules. Compared with the traditional advanced oxidation process, it has the advantages of good treatment effect, short treatment time and no need to add chemicals. However, when electron beam irradiation is used alone to treat membrane concentrates, due to the presence of high salt in the membrane concentrate, a high irradiation dose is usually required to achieve the desired treatment effect, resulting in a significant increase in treatment costs.

Therefore, how to reduce the impact of high salt in the membrane concentrate on the removal of organic pollutants by electron beam irradiation, and, while considering the removal of organic pollutants in the membrane concentrate, realize the recycling of salt in the membrane concentrate, and ultimately realize the use of salt Resource utilization is an issue that needs to be solved urgently.

Contents of the invention

In view of the above-mentioned problems existing in the prior art, the present invention provides a method and system for removing organic pollutants in the reverse osmosis concentrate of coking wastewater based on the electron beam irradiation process, and the concentrated liquid is treated with electron beam irradiation coupled with electrosorption, so as to Realize the removal of organic pollutants and recovery of salts in the reverse osmosis concentrate of coking wastewater.

The specific invention content is as follows:

In a first aspect, the present invention provides a method for removing organic pollutants from coking wastewater reverse osmosis concentrate based on an electron beam irradiation process. The process includes:

The reverse osmosis concentrate is passed into a high-dose electron beam irradiation unit, and part of the salts are ionized under the action of electron beam irradiation to produce hydrated electrons and oxidative free radicals; the hydrated electrons charge a part of the organic pollutants, so The oxidizing free radicals decompose part of the organic pollutants, thereby obtaining primary pre-purified water;

The primary pre-purified water is passed into the electro-adsorption treatment unit, so that the salt ions and part of the charged organic pollutants in the primary purified water are electro-adsorbed and removed under the action of an electric field; wherein the particles generated during the irradiation process are The H ₂ O ₂ is activated by the anode of the electrosorption treatment unit into hydroxyl radicals, which decompose organic pollutants adsorbed on the electrode surface, thereby obtaining secondary pre-purified water;

Pass the secondary pre-purified water into a low-dose electron beam irradiation unit to remove organic pollutants in the secondary pre-purified water to obtain tertiary pre-purified water;

The three-time pre-purified water is returned to the electro-adsorption treatment unit for circulation treatment until the COD in the effluent of the low-dose electron beam irradiation unit is ≤ 10 mg/L to complete the organic pollution in the coking wastewater reverse osmosis concentrate. removal of objects.

Optionally, in the reverse osmosis concentrated solution, 150mg/L≤COD≤500mg/L, 10000us/cm≤conductivity≤100000us/cm.

Optionally, the high-dose electron beam irradiation dose ranges from 20 to 100 kGy.

Optionally, the inlet water flow rate of the electro-adsorption unit is between 1m ³ /h and 20m ³ /h.

Optionally, the voltage applied by the electro-adsorption processing unit is between 1.2V and 1.7V.

Optionally, the anode of the electrosorption treatment unit is composed of carbon-coated iron-nickel material;

The cathode of the electrosorption treatment unit is composed of titanium plate or carbon material.

Optionally, the carbon-coated iron-nickel material includes: one or more of graphene-coated iron-nickel material, biochar-coated iron-nickel material, modified graphene-coated iron-nickel material, and modified biochar-coated iron-nickel material. combination of species.

Optionally, the low-dose electron beam irradiation dose ranges from 1 to 10 kGy.

Optionally, the number of cyclic processes is 1-20 times.

In a second aspect, the present invention provides a system for removing organic pollutants in the reverse osmosis concentrate of coking wastewater based on electron beam irradiation. The system is suitable for the method described in the first aspect, and includes:

A high-dose electron beam irradiation unit is used to ionize the salt substances in the reverse osmosis concentrate into hydrated electrons and oxidative free radicals; the hydrated electrons charge a portion of the organic pollutants, and the oxidative free radicals Part of the organic pollutants are decomposed to obtain primary pre-purified water;

An electrosorption processing unit, used to adsorb salt ions and a part of the charged organic pollutants in the primary pre-purified water; and activate H ₂ O ₂ generated by irradiation into hydroxyl radicals, and the hydroxyl radicals Decompose organic pollutants adsorbed on the electrode surface to obtain secondary pre-purified water;

A low-dose electron beam irradiation unit is used to decompose organic pollutants in the secondary pre-purified water to obtain purified water.

Compared with the prior art, the present invention has the following advantages:

The invention provides a method for removing organic pollutants in the coking wastewater reverse osmosis concentrate based on the electron beam irradiation process. By directly acting on high-dose electron beam irradiation on the coking wastewater reverse osmosis concentrate, the salt in the concentrate is removed. Direct ionization of salt-like substances into hydrated electrons and corresponding oxidative free radicals reduces the quenching effect of salt substances on active species in water and increases the concentration of active species in the system, thereby increasing the system's impact on organic pollution in concentrated solutions. The removal ability of substances; further, the high-dose electron beam irradiated water was subjected to electro-adsorption treatment, and the carbon-wrapped iron-nickel material was used as the anode material of the electro-adsorption treatment unit (the iron-nickel co-modified carbon material surface formed an obvious positive and negative charge areas, which are conducive to the adsorption of salt ions in the system), thereby better achieving brine separation; in addition, there is a certain amount of H ₂ O ₂ in the concentrated solution after electron beam irradiation conditions, and the carbon-coated iron Nickel material can adsorb H ₂ O ₂ very well and activate it into hydroxyl radicals. The hydroxyl radicals are used to remove organic pollutants adsorbed on the electrode surface, and can further remove organic pollutants in the concentrated solution; after electrosorption treatment The low-concentration organic pollutants remaining in the concentrated liquid are further decomposed and removed under the action of low-dose electron beam irradiation. If the COD of the effluent is greater than 10 mg/L, the effluent can be returned to the electro-adsorption treatment unit, and the electro-adsorption treatment unit and low-dose The electron beam irradiation unit circulates processing until the effluent COD is less than 10 mg/L.

The invention provides a method for removing organic pollutants in the reverse osmosis concentrate of coking wastewater based on electron beam irradiation. It is simple to operate and does not require the addition of chemical substances. It reduces organic pollutants in the membrane concentrate and is conducive to the recycling of salts. , has broad application prospects in the field of coking wastewater RO concentrated water treatment.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 shows a flow chart of a method for removing organic pollutants in the reverse osmosis concentrate of coking wastewater based on the electron beam irradiation process provided by an embodiment of the present invention;

Figure 2 shows a schematic structural diagram of a system for removing organic pollutants in the reverse osmosis concentrate of coking wastewater based on the electron beam irradiation process provided by the embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application or uses. Based on the embodiments of the present invention, any product that is the same or similar to the present invention and is obtained by anyone under the inspiration of the present invention or by combining the present invention with features of other prior art, shall fall within the scope of the present invention. within the scope of protection. And, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present invention.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the specification of the present invention.

In the description of the present invention, it should be understood that the use of words such as "first" and "second" to define components is only to facilitate the distinction between corresponding components. Unless otherwise stated, the above words have no special meaning. meaning and therefore cannot be construed as limiting the scope of the present invention.

In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Before describing in detail the treatment system and process for removing organic pollutants in the reverse osmosis concentrate of coking wastewater based on electron beam irradiation provided by the present invention, it is necessary to provide the following explanation of related technologies:

In current research and practical applications, the indirect effect of electron beam irradiation is mainly used for wastewater treatment, and the direct effect of electron beam irradiation is not considered. In addition, when the concentration of organic pollutants in the concentrated solution is low, since the salt substances are much greater than the concentration of organic pollutants, the active species generated during the electron beam irradiation process will react more with the salt substances and not be effective. Remove organic pollutants in lower concentrations. If electron beam irradiation is used alone to remove low-concentration organic pollutants from concentrates, a much higher irradiation dose than theoretically required is usually required, which significantly increases treatment costs.

Electroadsorption uses the action of an electric field to cause ions in water to migrate to oppositely charged electrodes, where they are adsorbed by the electrodes and stored in the electric double layer. Research shows that the separation of salt and water can be achieved using electroadsorption. However, electroadsorption cannot remove organic pollutants in water. Moreover, the selection of electrode materials is the key to electrosorption separation of salt and water.

Based on the above considerations, the present invention hopes to realize electron beam irradiation coupled with electro-adsorption treatment of concentrated liquid to achieve the removal of organic pollutants in the reverse osmosis concentrated liquid of coking wastewater. The specific implementation content is as follows:

In a first aspect, the present invention provides a method for removing organic pollutants from coking wastewater reverse osmosis concentrate based on an electron beam irradiation process. Figure 1 shows a method for removing coking wastewater reverse osmosis concentrate based on an electron beam irradiation process. The method flow chart for penetrating organic pollutants in concentrated liquid is shown in Figure 1. The method includes:

S1. Pass the reverse osmosis concentrate into the high-dose electron beam irradiation unit. Some salts will be ionized under the action of electron beam irradiation to produce hydrated electrons and oxidative free radicals; the hydrated electrons will charge some organic pollutants and make them oxidatively free. The base decomposes part of the organic pollutants to obtain primary pre-purified water;

S2. Pass the primary pre-purified water into the electro-adsorption treatment unit, so that the salt ions and some charged organic pollutants in the primary purified water are electro-adsorbed and removed under the action of the electric field; among them, the H ₂ O generated during the irradiation process _2. It is activated into hydroxyl radicals by the anode of the electroadsorption processing unit. The hydroxyl radicals decompose the organic pollutants adsorbed on the electrode surface, thereby obtaining secondary pre-purified water;

S3. Pass the secondary pre-purified water into the low-dose electron beam irradiation unit to remove organic pollutants in the secondary pre-purified water to obtain tertiary pre-purified water;

S4. Return the tertiary pre-purified water to the electro-adsorption treatment unit for recycling treatment until the COD in the effluent of the low-dose electron beam irradiation unit is ≤ 10 mg/L to complete the removal of organic pollutants in the coking wastewater reverse osmosis concentrate.

During specific implementation, the embodiments of the present invention utilize the direct effect of high-dose electron beam irradiation to directly ionize some salt substances to generate corresponding hydrated electrons and oxidative free radicals, where the oxidative free radicals include but are not limited to O ₂ · ^- , Cl · , SO ₄ ^- · and NO ₃ · etc. The conversion of salt substances reduces their quenching effect on active species. At the same time, the generated active species can also enhance the oxidation ability of organic pollutants in the concentrated solution. The high-dose electron beam irradiation dose ranges from 20 to 100kGy; another On the other hand, hydrated electrons are also generated during the electron beam irradiation process, which makes the originally neutral organic pollutants charged, which in turn enables electrosorption to remove some organic pollutants in the concentrated solution.

When the dose of electron beam irradiation on the RO concentrate is between 20 and 100 kGy, some salt substances in the concentrate are ionized and decomposed, and some organic pollutants are decomposed under the action of ionization products. Electro-adsorption means are further used to The remaining salts and water can be separated. The voltage applied during the electrosorption process ranges from 1.2 to 1.7V. Moreover, the present invention uses carbon-coated iron-nickel material as the cathode material of the electrosorption processing unit, which has a good adsorption effect on H ₂ O ₂ generated during electron beam irradiation and activates it into hydroxyl radicals. Hydroxyl radicals can be used to remove organic pollutants adsorbed on the electrode surface, improve the purity of salt substances adsorbed by electrode materials, and increase the recovery value of salt substances.

In the effluent treated by the electrosorption treatment unit, the remaining low-concentration organic pollutants can be removed through back-end low-dose electron beam irradiation. If the COD of the effluent after low-dose electron beam irradiation is greater than 10 mg/L, the effluent can be returned The electro-adsorption treatment unit is cyclically processed by the electro-adsorption treatment unit and the low-dose electron beam irradiation unit until the effluent COD is less than 10 mg/L. Through the synergistic effect of electron beam irradiation and electro-adsorption, the present invention can effectively remove organic pollutants in the membrane concentrate, and ultimately utilize the experimental salt resources.

During specific implementation, high-dose electron beam irradiation can directly ionize part of the salt substances in the RO concentrate into hydrated electrons and oxidative free radicals, and the remaining salt substances continue to be adsorbed and removed by the electrosorption processing unit. Therefore, the present invention can treat the reverse osmosis concentrate of coking wastewater with high salt content. The salt content is expressed by the conductivity of the solution. The highest value can reach 100000us/cm and the lowest value is not less than 10000us/cm. Moreover, the treatment process provided by the present invention is suitable for organic matter concentration in the RO concentrated liquid being 150 mg/L ≤ COD ≤ 500 mg/L.

In some embodiments, the anode of the electrosorption processing unit is composed of carbon-coated iron-nickel material; the cathode of the electrosorption processing unit is composed of titanium plate or carbon material. Preferred carbon-coated iron-nickel materials include: one or a combination of one or more of graphene-coated iron-nickel materials, biochar-coated iron-nickel materials, modified graphene-coated iron-nickel materials, and modified biochar-coated iron-nickel materials. Since H ₂ O ₂ is generated during the electron beam irradiation process, the carbon-coated iron-nickel material is used as the electrode anode for electrosorption. The iron-nickel modification increases the active sites on the electrode surface, enhances its ability to adsorb salt in sewage, and also reduces the It eliminates the energy barrier required to activate the H ₂ O ₂ (oxidant) present in the system, and activates H ₂ O ₂ into hydroxyl radicals. The hydroxyl radicals can remove organic pollutants adsorbed on the electrode surface and increase the amount of salts adsorbed by the electrode material. The purity of the material, thereby improving the recovery value of salt materials. In addition, the addition of thiourea introduces sulfur and nitrogen into the electrode material at the same time. Sulfur is a multivalent element with abundant electrons, which can improve the electron transfer capacity and electron exchange capacity of the electrode material, thereby further promoting the adsorption of oxidants. activation. The electrode material not only has good salt separation performance, but also has the ability to adsorb and activate oxidants. The presence of nitrogen enables the iron and nickel in the composite material to complex with nitrogen to form a more stable structure, effectively preventing material loss or failure caused by iron and nickel dissolution during the actual use of the composite material.

In some embodiments, the biochar-coated iron-nickel material can be obtained by the following preparation method: 20 ml of 0.1 M potassium ferricyanide solution is added dropwise to 20 ml of 0.15 M solution, and after aging in the air for 12 hours, filtered, deionized water Wash three times to obtain a Prussian blue analogue. Then, place it in a 60°C oven to dry for 12 hours. Place 0.5g of dried Prussian blue solid and 1.5g of chitosan in 50ml of deionized water, ultrasonic for 10min, stir for 1h, and then dry in an oven at 80°C for 12h. Mix 1g of dried solid with 10g of thiourea solid and grind evenly. Place the ground powder into a tube furnace. Under nitrogen conditions, the temperature was raised to 550°C at 3°C/min and held for 1 hour, and then the temperature was raised to 900°C at 5°C/min and held for 1 hour. After natural cooling, the obtained solid was washed three times with deionized water and placed in a 60°C oven. After drying, the solid obtained is carbon-coated iron-nickel material.

In some embodiments, the graphene-coated iron-nickel material can be obtained by the following preparation method: 20 ml of 0.1 M potassium ferricyanide solution is added dropwise to 20 ml of 0.2 M solution, and after aging in the air for 10 hours, filtered, deionized water Wash three times to obtain a Prussian blue analogue. Then, place it in an 80°C oven to dry for 12 hours. Place 0.5 g of dried Prussian blue solid and 2 g of modified graphene in 50 ml of deionized water, ultrasonic for 10 min, stir for 1 h, and then dry in an oven at 80°C for 12 h. Mix 1g of dried solid with 15g of thiourea solid and grind evenly. Place the ground powder into a tube furnace. Under nitrogen conditions, the temperature was raised to 550°C at 3°C/min and held for 1 hour, and then the temperature was raised to 900°C at 5°C/min and held for 1 hour. After natural cooling, the obtained solid was washed three times with deionized water and placed in a 60°C oven. After drying, the solid obtained is carbon-coated iron-nickel material.

In some embodiments, after the three-time pre-purified water is returned to the electro-adsorption treatment unit for circulation treatment 5-20 times, the COD in the effluent is ≤10 mg/L.

In a second aspect, the present invention provides a system for removing organic pollutants in the reverse osmosis concentrate of coking wastewater based on an electron beam irradiation process. The system is suitable for the method described in the first aspect. Figure 2 shows the present invention. The schematic structural diagram of the system for removing organic pollutants in the reverse osmosis concentrate of coking wastewater based on the electron beam irradiation process provided in the embodiment is shown in Figure 2 and includes:

The high-dose electron beam irradiation unit is used to ionize the salt substances in the reverse osmosis concentrate into hydrated electrons and oxidative free radicals; the hydrated electrons charge some of the organic pollutants, and the oxidative free radicals decompose some of the organic pollutants. Thus, primary pre-purified water is obtained;

The electro-adsorption processing unit is used to adsorb salt ions and some charged organic pollutants in primary pre-purified water; and to activate H ₂ O ₂ generated by irradiation into hydroxyl radicals, which convert the hydroxyl radicals adsorbed on the electrode surface. Organic pollutants are decomposed to obtain secondary pre-purified water;

The low-dose electron beam irradiation unit is used to decompose organic pollutants in secondary pre-purified water to obtain purified water.

In order to enable those skilled in the art to understand the present invention more clearly, the method and system of the present invention for removing organic pollutants from the reverse osmosis concentrate of coked wastewater based on the electron beam irradiation process will be described in detail through the following examples.

The specific treatment method of coking wastewater is: RO concentrated water first passes through the first-stage electron beam irradiation treatment unit (high-dose electron beam irradiation unit), the effluent enters the electro-adsorption treatment unit, and finally enters the second-stage electron beam irradiation treatment unit (low-dose electron beam irradiation unit), the effluent is discharged directly (the COD in the effluent is less than 10 mg/L), or it is returned to the electrosorption treatment unit after multiple cycles, and the effluent COD of the low-dose electron beam irradiation unit is less than 10 mg/L. Discharge, and finally complete the treatment of the membrane concentrate.

Example 1

Take the RO concentrate from a coking plant in Hebei. The initial COD is 247mg/L and the conductivity is 17500μs/cm. The anode of the electrosorption unit is iron-nickel modified coconut shell carbon, the cathode is a titanium plate, and the flow rate is 1m ³ /h. The electron beam irradiation dose in the first section is 30kGy, and the electron beam irradiation dose in the second section is 5kGy. After 3 cycles of treatment, the effluent COD is <10mg/L.

Example 2

Take the RO concentrate from a coking plant in Hebei. The initial COD is 247mg/L and the conductivity is 17500μs/cm. The anode of the electrosorption unit is iron-nickel modified coconut shell carbon, the cathode is a titanium plate, and the flow rate is 1m ³ /h. The electron beam irradiation dose in the first section is 50kGy, and the electron beam irradiation dose in the second section is 10kGy. After 2 cycles of treatment, the effluent COD is <10mg/L.

Example 3

Take the RO concentrate from a coking plant in Hebei. The initial COD is 376mg/L and the conductivity is 77500μs/cm. The anode of the electrosorption unit is iron-nickel modified coconut shell carbon, the cathode is a titanium plate, and the flow rate is 1m ³ /h. The electron beam irradiation dose in the first section is 70kGy, and the electron beam irradiation dose in the second section is 10kGy. After 6 cycles of treatment, the effluent COD is <10mg/L.

Comparative example 1

Take the RO concentrate from a coking plant in Hebei. The initial COD is 247mg/L and the conductivity is 17500μs/cm. A separate electron beam irradiation treatment was used, the irradiation dose was 150kGy, and the effluent COD after treatment was 134mg/L.

Comparative example 2

Take the RO concentrate from a coking plant in Hebei. The initial COD is 376mg/L and the conductivity is 77500μs/cm. A separate electron beam irradiation treatment was used, the irradiation dose was 150kGy, and the effluent COD after treatment was 277mg/L.

It can be seen from the above embodiments that the electron beam irradiation coupled electrosorption technology can effectively reduce the impact of high salt. Since no chemical substances are added during the entire treatment process, the purity of the final salt is relatively high. Therefore, electron beam irradiation coupled electrosorption technology has the advantages of simple operation, good treatment effect and high purity of salt extraction.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "an example," "specific examples," or "some examples" or the like means that specific features are described in connection with the embodiment or example. , structures, materials or features are included in at least one embodiment or example of the invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

For the method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, some steps Other orders or simultaneous steps are possible. Secondly, those skilled in the art should also know that the embodiments described in the specification are preferred embodiments, and the actions and components involved are not necessarily necessary for the present invention.

The above is a detailed introduction to the method and system for removing organic pollutants in the reverse osmosis concentrate of coking wastewater based on the electron beam irradiation process provided by the present invention. Specific examples are used in this article to illustrate the principle and implementation of the present invention. Explanation: The above description of the embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, there will be changes in the specific implementation and application scope according to the idea of the present invention. In summary, the contents of this specification should not be construed as limitations of the present invention.

Claims (10)

1. A method for removing organic pollutants from coking wastewater reverse osmosis concentrate based on electron beam irradiation process, characterized in that the process includes: The reverse osmosis concentrate is passed into a high-dose electron beam irradiation unit, and part of the salts are ionized under the action of electron beam irradiation to produce hydrated electrons and oxidative free radicals; the hydrated electrons charge part of the organic pollutants, so The oxidizing free radicals decompose part of the organic pollutants, thereby obtaining primary pre-purified water; The primary pre-purified water is passed into the electro-adsorption treatment unit, so that the salt ions and part of the charged organic pollutants in the primary purified water are electro-adsorbed and removed under the action of an electric field; wherein the particles generated during the irradiation process are The H ₂ O ₂ is activated by the anode of the electrosorption treatment unit into hydroxyl radicals, which decompose organic pollutants adsorbed on the electrode surface, thereby obtaining secondary pre-purified water; Pass the secondary pre-purified water into a low-dose electron beam irradiation unit to remove organic pollutants in the secondary pre-purified water to obtain tertiary pre-purified water; The three-time pre-purified water is returned to the electro-adsorption treatment unit for circulation treatment until the COD in the effluent of the low-dose electron beam irradiation unit is ≤ 10 mg/L to complete the organic pollution in the coking wastewater reverse osmosis concentrate. removal of objects. 2. The method according to claim 1, characterized in that, in the reverse osmosis concentrate, 150mg/L≤COD≤500mg/L, 10000us/cm≤conductivity≤100000us/cm. 3. The treatment process according to claim 1, wherein the high-dose electron beam irradiation dose is between 20 and 100 kGy. 4. The method according to claim 1, characterized in that the inlet water flow rate of the electro-adsorption unit is between 1 m ³ /h and 20 m ³ /h. 5. The method according to claim 1, wherein the voltage applied by the electrosorption processing unit is between 1.2V and 1.7V. 6. The method according to claim 1, characterized in that the anode of the electrosorption treatment unit is composed of carbon-coated iron-nickel material; The cathode of the electrosorption treatment unit is composed of titanium plate or carbon material. 7. The method according to claim 6, wherein the carbon-coated iron-nickel material includes: graphene-coated iron-nickel material, biochar-coated iron-nickel material, modified graphene-coated iron-nickel material and modified biological material. One or more combinations of carbon-coated iron-nickel materials. 8. The method according to claim 1, wherein the low-dose electron beam irradiation dose is between 1 and 10 kGy. 9. The method according to claim 1, characterized in that the number of cycles is 1-20 times. 10. A system for treating organic pollutants in the reverse osmosis concentrate of coking wastewater based on electron beam irradiation technology, characterized in that the system is suitable for the method described in any one of the above claims 1-9, including: A high-dose electron beam irradiation unit is used to ionize the salt substances in the reverse osmosis concentrate into hydrated electrons and oxidative free radicals; the hydrated electrons charge a portion of the organic pollutants, and the oxidative free radicals Part of the organic pollutants are decomposed to obtain primary pre-purified water; An electrosorption processing unit, used to adsorb salt ions and a part of the charged organic pollutants in the primary pre-purified water; and activate H ₂ O ₂ generated by irradiation into hydroxyl radicals, and the hydroxyl radicals Decompose organic pollutants adsorbed on the electrode surface to obtain secondary pre-purified water; A low-dose electron beam irradiation unit is used to decompose organic pollutants in the secondary pre-purified water to obtain purified water.