Industrial waste liquid treatment method and system based on electron irradiation technology

Abstract

The invention discloses an industrial waste liquid treatment method and system based on an electron irradiation technology, and relates to the technical field of industrial waste water treatment.The industrial waste liquid treatment method comprises the steps that in the pretreatment stage, suspended particles larger than or equal to 5 microns in waste liquid are intercepted, and the pH is adjusted to 3.5-11; in the dynamic irradiation order and section, electron beams of 0.5-3 MeV are adopted, the beam intensity is 10-50 mA, and the irradiation time is calculated according to a COD concentration formula; and a post-treatment stage: carrying out three-stage filtration, filtration with 5-20 [mu] m fiber, modified zeolite adsorption and nano TiO photocatalytic reaction, and finally monitoring the effluent by an ultraviolet detector. According to the method, by dynamically adjusting the electron beam energy and the radiation dose, the COD removal rate is increased by 35-45%, meanwhile, the radiation dose is reduced by 30% or above, toxic by-products generated by excessive radiation are avoided, and experimental data shows that the generation amount of bromate in the waste liquid treated through the method is smaller than 0.1 mg / L and is reduced by 80% compared with a traditional method.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial wastewater treatment, and in particular to an industrial waste liquid treatment method and system based on electron irradiation technology. Background Art

[0002] Industrial wastewater treatment technology refers to the process of converting wastewater containing pollutants into water resources that meet emission standards or are reusable through physical, chemical or biological methods. Common treatment technologies include physical treatment technology, chemical treatment technology, biological treatment technology, as well as iron-carbon micro-electrolysis treatment technology, ozone oxidation, magnetic separation technology and other advanced treatment technologies.

[0003] In the existing technology, the treatment of high-concentration difficult-to-degrade organic waste liquid mainly relies on direct radiation of high-energy electron beams, chemical reagent-assisted degradation or multi-stage physical separation processes. However, these methods have the following shortcomings: traditional electron irradiation technology uses a fixed high-dose electron beam to treat waste liquid, which leads to huge energy consumption and increased operating costs. At the same time, excessive radiation can easily cause excessive ionization of water molecules, generating toxic byproducts such as bromate and chlorate, whose concentrations often exceed emission standards. In addition, the existing equipment lacks a dynamic adjustment mechanism and cannot adaptively adjust the irradiation parameters according to the concentration of pollutants in the waste liquid, resulting in a waste of resources; and the removal rate of colloidal pollutants in physical separation processes such as sedimentation and screening is less than 60%, which is difficult to meet the current emission standards. The chemical agent method relies on the manual addition of oxidants or flocculants, which has the risk of secondary pollution and is difficult to accurately control the dosage. In addition, the existing system cannot cope with complex water quality fluctuations, has poor treatment stability, and often requires multi-stage series operation to meet the standards. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an industrial waste liquid treatment method and system based on electron irradiation technology to solve the problems in the above technical solutions.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme: a method for treating industrial waste liquid based on electron irradiation technology, comprising the following steps: S1: Pretreatment stage: The suspended particles with a particle size greater than or equal to 5 μm in the waste liquid are intercepted by a physical filtration device with a filtration accuracy of 0.1-100 μm, and the pH value of the waste liquid is adjusted to the range of 3.5-11 by a pH regulator; S2: Dynamic irradiation stage: The pretreated waste liquid is irradiated with an electron beam with an energy range of 0.5-3 MeV. The electron beam current intensity is controlled in the range of 10-50 mA. The irradiation time is calculated according to the COD concentration of the waste liquid according to the formula t=K×(COD initial value / 1000)^0.3; S3: Post-treatment stage: It passes through a three-stage filtration system with decreasing pore size, including a fiber filtration layer with a pore size of 5-20μm, an adsorption column filled with modified zeolite and a photocatalytic reactor loaded with nano-TiO2, and finally the effluent indicators are monitored online by a UV detector.

[0006] As a preferred embodiment, the cyclone desander in the pretreatment stage adopts a double cone structure with cone angles of 15° and 7° respectively, and a spiral guide vane is arranged on the inner wall. The processing capacity is 5-30m³ / h, and the separation efficiency is greater than or equal to 95%; the bag filter is made of polypropylene, with a filtration accuracy of 10-50μm, a maximum pressure bearing capacity greater than or equal to 0.6MPa, and a filter element replacement cycle of less than or equal to 3 months.

[0007] The beneficial effects of adopting the above further scheme are: the cyclone desander and bag filter in the pretreatment stage are precisely designed, which improves the pretreatment efficiency of the waste liquid. The cyclone desander adopts a double cone structure and a spiral guide vane, which effectively improves the separation efficiency of suspended particles and ensures the smoothness of the subsequent treatment process. The bag filter is made of polypropylene, with high filtration accuracy and strong pressure bearing capacity. The filter element replacement cycle is reasonable, which reduces maintenance costs and ensures the cleanliness of the waste liquid entering the irradiation treatment stage.

[0008] As a preferred embodiment, the pH regulator is a NaOH solution with a concentration of 1-5 mol / L or a H2SO4 solution with a concentration of 0.5-3 mol / L. During the adjustment process, a pH / ORP composite electrode is used for real-time monitoring, and the response time is controlled to be less than or equal to 2 seconds. When the COD of the waste liquid is greater than 2000 mg / L, it automatically switches to a gradient adjustment mode, that is, first adjust to pH 5.5-6.5 for pre-oxidation, and then adjust back to neutral.

[0009] The beneficial effects of adopting the above further scheme are: the selection of pH regulator and the intelligent adjustment process ensure the precise control of the pH value of the waste liquid, and NaOH solution or H2SO4 solution is used as the pH regulator, and real-time monitoring is performed through the pH / ORP composite electrode, which responds quickly and improves the adjustment efficiency. When the COD value of the waste liquid is high, it automatically switches to the gradient adjustment mode, first pre-oxidation and then adjustment to neutral. This design helps to reduce the difficulty of irradiation treatment and improve the treatment effect.

[0010] As a preferred embodiment, the electron accelerator used in the dynamic irradiation stage is a compact linear accelerator with an energy adjustment range of 0.5-3MeV, continuously adjustable beam intensity, equipped with a radiation shielding cover with a lead equivalent of greater than or equal to 4mm and an automatic safety interlock device; the electron beam incident angle is controlled within the range of 30°-60° by an adjustable bracket to ensure that the irradiation uniformity is greater than or equal to 90%.

[0011] The beneficial effects of adopting the above further scheme are: the electron accelerator used in the dynamic irradiation stage has an advanced design, which ensures the uniformity and safety of the irradiation treatment. The compact linear accelerator has a wide energy adjustment range, the beam intensity is continuously adjustable, and it is equipped with a radiation shielding cover and an automatic safety interlock device, which effectively ensures the safety of the operator. The adjustability of the electron beam incident angle ensures that the waste liquid is uniformly irradiated during the irradiation process, thereby improving the treatment efficiency.

[0012] As a preferred embodiment, in the three-stage filtration system of the post-treatment stage: the first-stage fiber filtration layer adopts a polypropylene melt-blown filter element, the pore size distribution presents a normal curve, the filtration speed is less than or equal to 5m / h, and the pressure drop is less than or equal to 0.1MPa; the second-stage adsorption column is filled with modified zeolite, and the specific surface area reaches 800-1200m² / g after activation with NaCl solution. After adsorption saturation, it is regenerated by 0.5-1mol / LNaCl solution, and the regeneration efficiency is greater than or equal to 85%; the TiO2 loading in the third-stage photocatalytic reactor is 5-15wt%, the light source is 12 20W low-pressure mercury lamps, the light intensity is 300-800W / m², and the reaction temperature is controlled at 20-40℃.

[0013] The beneficial effects of adopting the above further scheme are: the three-stage filtration system in the post-treatment stage is reasonably designed, which effectively improves the purification effect of the waste liquid. The first-stage fiber filtration layer adopts a polypropylene melt-blown filter element, which has a fast filtration speed and low pressure drop, ensuring the smooth flow of the waste liquid. The second-stage adsorption column is filled with modified zeolite, which has strong adsorption capacity and high regeneration efficiency, reducing the operating cost. The TiO2 loading in the third-stage photocatalytic reactor is moderate, the light source intensity is reasonable, and the reaction temperature is properly controlled, ensuring the deep degradation of organic matter in the waste liquid.

[0014] On the other hand, the present application also provides an industrial waste liquid treatment system based on electron irradiation technology: comprising: a pretreatment unit, which is composed of a cyclone desander, a bag filter, a precision filter element filter and an online pH adjustment tank connected in sequence; The irradiation treatment unit consists of three electron accelerators connected in parallel, each equipped with an independent power supply control system and dose monitoring device; The post-processing unit includes a mechanical filtration device, an adsorption reaction bed and a deep purification device, and each unit is connected by a corrosion-resistant pump and an electromagnetic flowmeter.

[0015] As a preferred embodiment, the bag filter in the pretreatment unit is made of polypropylene, with a filtration accuracy of 30μm and a temperature resistance of 80°C. The filter element is replaced by a pneumatic quick-opening device, which takes less than or equal to 5 minutes. The precision filter element filter uses a polyethersulfone folded filter element with a pore size of 0.45μm and a filtration efficiency greater than or equal to 99.9%.

[0016] The beneficial effects of adopting the above further scheme are: the bag filter in the pretreatment unit is made of polypropylene, which has high temperature resistance and is easy to replace, thereby improving the efficiency and stability of waste liquid pretreatment. The use of precision filter element filter further improves the cleanliness of the waste liquid and lays a good foundation for subsequent treatment processes.

[0017] As a preferred embodiment, the electron accelerator of the irradiation treatment unit is a compact linear accelerator with an energy adjustment range of 0.5-3MeV, continuously adjustable beam intensity, equipped with a radiation shielding cover with a lead equivalent of 5mm and an automatic safety interlock device, an electron beam scanning width of 0.5-2m, and uniform irradiation is achieved through a magnetic deflection system.

[0018] The beneficial effects of adopting the above further scheme are: the electron accelerator of the irradiation treatment unit is of advanced design and high safety performance, ensuring the uniformity and safety of the waste liquid irradiation treatment, and the adjustability of the electron beam scanning width improves the flexibility of waste liquid treatment. The use of the magnetic deflection system ensures that the waste liquid is uniformly irradiated during the irradiation process, further improving the treatment effect.

[0019] As a preferred embodiment, the mechanical filtration device of the post-treatment unit is filled with a ceramic microfiltration membrane, the transmembrane pressure difference is less than or equal to 0.1 MPa, and the backwashing cycle is 8-12 hours; the adsorption reaction bed is filled with modified activated carbon particles, which are reused through thermal regeneration after adsorption saturation, and the regeneration loss rate is less than 5%.

[0020] The beneficial effects of adopting the above further scheme are: the mechanical filtration device and adsorption reaction bed of the post-treatment unit are reasonably designed, which effectively improves the purification effect of the waste liquid. The use of ceramic microfiltration membrane improves the filtration accuracy and stability, the filling of modified activated carbon particles enhances the adsorption capacity of organic matter in the waste liquid, the use of thermal regeneration technology reduces the loss rate of adsorption materials and prolongs the service life, and the setting of the backwash cycle ensures the continuous and stable operation of the mechanical filtration device.

[0021] Compared with the prior art, the advantages and positive effects of the present invention are: First, the present invention increases the COD removal rate by 35-45% by dynamically adjusting the electron beam energy and irradiation dose, while reducing the radiation dose by more than 30%, thereby avoiding the toxic byproducts produced by excessive radiation. Experimental data show that the amount of bromate generated in the waste liquid after treatment by this method is less than 0.1 mg / L, which is 80% lower than that of the traditional method.

[0022] Second, the present invention adopts a three-stage filtration-adsorption-catalysis integrated system, which improves the treatment efficiency of waste liquid containing difficult-to-degrade substances such as phenols and polycyclic aromatic hydrocarbons by more than 2 times. The system can automatically switch the operating mode according to the inlet water quality, and can maintain stable effluent standards for waste liquid with COD fluctuations of ±30%. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an industrial waste liquid treatment method based on electron irradiation technology and the overall flow chart of the system; Figure 2 It is an industrial waste liquid treatment method based on electron irradiation technology and a flow chart of the system pretreatment stage; Figure 3 It is an industrial waste liquid treatment method based on electron irradiation technology and a system dynamic irradiation stage flow chart; Figure 4 The invention relates to an industrial waste liquid treatment method based on electron irradiation technology and a flow chart of the post-treatment stage of the system. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the present invention provides a technical solution: a method for treating industrial waste liquid based on electron irradiation technology, comprising the following steps: S1: Pretreatment stage: The suspended particles with a particle size greater than or equal to 5 μm in the waste liquid are intercepted by a physical filtration device with a filtration accuracy of 0.1-100 μm, and the pH value of the waste liquid is adjusted to the range of 3.5-11 by a pH regulator; S2: Dynamic irradiation stage: The pretreated waste liquid is irradiated with an electron beam with an energy range of 0.5-3 MeV. The electron beam current intensity is controlled in the range of 10-50 mA. The irradiation time is calculated according to the COD concentration of the waste liquid according to the formula t=K×(COD initial value / 1000)^0.3; S3: Post-treatment stage: It passes through a three-stage filtration system with decreasing pore size, including a fiber filtration layer with a pore size of 5-20μm, an adsorption column filled with modified zeolite and a photocatalytic reactor loaded with nano-TiO2, and finally the effluent indicators are monitored online by a UV detector.

[0026] The physical filtration device adopts a three-stage series structure of a cyclone desander-bag filter-precision filter element, wherein the cyclone desander removes large particle impurities with a particle size greater than or equal to 50μm, the bag filter intercepts 10-50μm suspended matter, and the precision filter element filter further intercepts 0.45-5μm particles, and the total suspended matter removal rate is greater than or equal to 99.5%; the pH regulator is preferably a sodium hydroxide solution with a concentration gradient of 1-5mol / L or a sulfuric acid solution with a concentration gradient of 0.5-3mol / L, which is quickly mixed with the waste liquid through a venturi mixer, and the adjustment response time is less than or equal to 2 seconds; The electron beam energy in the irradiation stage is adjusted in real time through a feedback control system. The value range of parameter K in the irradiation dose calculation formula has been experimentally verified to be 0.5-2 seconds·L / mg, ensuring that waste liquid with different COD concentrations obtains the optimal irradiation time. In the three-stage filtration of the post-treatment system, the fiber filter layer adopts a gradient pore size design of, for example, 10μm for the outer layer, 5μm for the middle layer, and 2μm for the inner layer to intercept colloidal pollutants. The modified zeolite adsorption column adsorbs heavy metals and some organic matter through ion exchange. The TiO2 in the photocatalytic reactor produces ·OH free radicals under the excitation of ultraviolet light to degrade residual difficult-to-degrade substances.

[0027] The cyclone desander in the pretreatment stage adopts a double cone structure with cone angles of 15° and 7° respectively. A spiral guide vane is set on the inner wall. Its processing capacity is 5-30m³ / h and the separation efficiency is greater than or equal to 95%. The bag filter is made of polypropylene with a filtration accuracy of 10-50μm, a maximum pressure bearing capacity greater than or equal to 0.6MPa, and a filter element replacement cycle of less than or equal to 3 months.

[0028] The pH adjuster is a NaOH solution with a concentration of 1-5 mol / L or a H2SO4 solution with a concentration of 0.5-3 mol / L. During the adjustment process, a pH / ORP composite electrode is used for real-time monitoring, and the response time is controlled to be less than or equal to 2 seconds. When the COD of the waste liquid is greater than 2000 mg / L, it automatically switches to the gradient adjustment mode, that is, first adjust to pH 5.5-6.5 for pre-oxidation, and then adjust back to neutral.

[0029] Among them, the gradient adjustment mode is: when COD is greater than 2000mg / L, first adjust to pH5.5-6.5, degrade some organic matter through the Fe³⁺ / H2O2 pre-oxidation system, and then adjust it back to neutral to reduce subsequent irradiation energy consumption; the pH / ORP composite electrode uses reference electrode Ag / AgCl and pH glass electrode, with a measurement accuracy of ±0.05pH unit and a response time of less than 1 second.

[0030] The electron accelerator used in the dynamic irradiation stage is a compact linear accelerator with an energy adjustment range of 0.5-3MeV and continuously adjustable beam intensity. It is equipped with a radiation shielding cover with a lead equivalent of greater than or equal to 4mm and an automatic safety interlock device; the electron beam incident angle is controlled within the range of 30°-60° through an adjustable bracket to ensure that the irradiation uniformity is greater than or equal to 90%.

[0031] In the three-stage filtration system of the post-treatment stage: the first-stage fiber filtration layer adopts a polypropylene melt-blown filter element, the pore size distribution presents a normal curve, the filtration speed is less than or equal to 5m / h, and the pressure drop is less than or equal to 0.1MPa; the second-stage adsorption column is filled with modified zeolite, and the specific surface area reaches 800-1200m² / g after activation with NaCl solution. After adsorption saturation, it is regenerated by 0.5-1mol / LNaCl solution, and the regeneration efficiency is greater than or equal to 85%; the TiO2 loading in the third-stage photocatalytic reactor is 5-15wt%, the light source is 12 20W low-pressure mercury lamps, the light intensity is 300-800W / m², and the reaction temperature is controlled at 20-40℃.

[0032] Among them, the first-stage fiber filtration layer adopts a polypropylene melt-blown filter element with a pore size distribution of D50=10μm, D90=20μm, and the filtration speed is gradient controlled from 5m / h at the inlet end to 2m / h at the outlet end; the third-stage photocatalytic reactor TiO2 is loaded on an α-Al2O3 carrier with a particle size of 50-100μm, the ultraviolet light wavelength of the low-pressure mercury lamp is 254nm, and an aeration device with a gas-water ratio of 10:1 is set in the reactor to keep the catalyst surface clean.

[0033] On the other hand, the present application also provides an industrial waste liquid treatment system based on electron irradiation technology: comprising: a pretreatment unit, which is composed of a cyclone desander, a bag filter, a precision filter element filter and an online pH adjustment tank connected in sequence; The irradiation treatment unit consists of three electron accelerators connected in parallel, each equipped with an independent power supply control system and dose monitoring device; The post-processing unit includes a mechanical filtration device, an adsorption reaction bed and a deep purification device, and each unit is connected by a corrosion-resistant pump and an electromagnetic flowmeter.

[0034] The bag filter in the pretreatment unit is made of polypropylene, with a filtration accuracy of 30μm and a temperature resistance of 80°C. The filter element is replaced through a pneumatic quick-open device, which takes less than or equal to 5 minutes. The precision filter element filter uses a polyethersulfone folded filter element with a pore size of 0.45μm and a filtration efficiency greater than or equal to 99.9%.

[0035] Among them, the pneumatic quick-opening device is driven by an SMC solenoid valve, with an action time of less than 3 seconds, and the filter element can be replaced without stopping; the folded filter element of the precision filter element polyethersulfone has a pore size of 0.45μm and a temperature resistance range of -20℃~80℃.

[0036] The electron accelerator of the irradiation treatment unit is a compact linear accelerator with an energy adjustment range of 0.5-3MeV and continuously adjustable beam intensity. It is equipped with a radiation shielding cover with a lead equivalent of 5mm and an automatic safety interlock device. The electron beam scanning width is 0.5-2m, and uniform irradiation is achieved through a magnetic deflection system.

[0037] When the electron beam is scanned, the magnetic deflection coil generates a scanning window with a width of 0.5-2m, and the irradiation area is precisely controlled through a multi-stage focusing lens with f=500mm. The dose monitoring device uses a sensitivity of 10⁻ 8 The C / kg ionization chamber detector monitors the radiation dose in real time, and the data is synchronized to the PLC controller.

[0038] The mechanical filtration device of the post-treatment unit is filled with a ceramic microfiltration membrane, the transmembrane pressure difference is less than or equal to 0.1MPa, and the backwash cycle is 8-12 hours; the adsorption reaction bed is filled with modified activated carbon particles, which are reused through thermal regeneration after adsorption saturation, and the regeneration loss rate is less than 5%.

[0039] Among them, the ceramic microfiltration membrane is made of zirconium oxide with a pore size of 0.1μm; the modified activated carbon particles are coconut shell carbon modified by soaking in nitric acid for 4 hours, the acid concentration of nitric acid is 65%, the specific surface area is 1500m² / g, the iodine value is 1250mg / g, the thermal regeneration temperature is 300℃ and nitrogen protection is introduced.

[0040] Working principle: In the pretreatment stage, the waste liquid first passes through the cyclone desander to separate large particles of impurities by centrifugal force, and then passes through the bag filter and precision filter element filter to effectively intercept suspended matter and particles, ensuring that the total suspended matter removal rate is not less than 99.5%. At the same time, the pH value of the waste liquid is intelligently adjusted through the online pH adjustment tank. When the COD value exceeds 2000mg / L, the system automatically switches to the gradient adjustment mode to quickly and accurately adjust the pH value of the waste liquid and enter the dynamic irradiation stage. The pretreated waste liquid is sent to the irradiation reactor, where three parallel compact linear accelerators emit high-energy electron beams for irradiation treatment. The electron beam is scanned by the magnetic deflection system to form a uniform irradiation field. The irradiation time is based on the C The OD initial value is dynamically calculated to ensure the precise adaptation of the irradiation dose. In the post-treatment stage, the irradiated waste liquid passes through a three-stage filtration system in sequence, including a fiber filter layer, a modified zeolite adsorption column and a photocatalytic reactor to further remove colloidal pollutants, heavy metals and residual organic matter. The final effluent is monitored online by a UV detector to ensure that indicators such as COD and ammonia nitrogen meet the standards before discharge. In addition, the COD removal rate is improved by intelligently adjusting the electron beam energy and the pre-oxidation gradient adjustment mode, and no chemical agents are required to be added throughout the process, which effectively reduces the energy consumption and by-product generation during the treatment process. The PLC-based closed-loop system realizes real-time coordination of pretreatment, irradiation and post-treatment parameters, thereby improving the adaptability and stability of the system.

[0041] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for treating industrial waste liquid based on electron irradiation technology, comprising the following steps: S1: Pretreatment stage: The suspended particles with a particle size greater than or equal to 5 μm in the waste liquid are intercepted by a physical filtration device with a filtration accuracy of 0.1-100 μm, and the pH value of the waste liquid is adjusted to the range of 3.5-11 by a pH regulator; S2: Dynamic irradiation stage: The pretreated waste liquid is irradiated with an electron beam with an energy range of 0.5-3 MeV. The electron beam current intensity is controlled in the range of 10-50 mA. The irradiation time is calculated according to the COD concentration of the waste liquid according to the formula t=K×(COD initial value / 1000)^0.3; S3: Post-treatment stage: It passes through a three-stage filtration system with decreasing pore size, including a fiber filtration layer with a pore size of 5-20μm, an adsorption column filled with modified zeolite and a photocatalytic reactor loaded with nano-TiO2, and finally the effluent indicators are monitored online by a UV detector.

2. The method for treating industrial waste liquid based on electron irradiation technology according to claim 1, characterized in that: The cyclone desander in the pretreatment stage adopts a double cone structure with cone angles of 15° and 7° respectively, and a spiral guide vane is arranged on the inner wall. Its processing capacity is 5-30m³ / h, and the separation efficiency is greater than or equal to 95%; the bag filter is made of polypropylene, with a filtration accuracy of 10-50μm, a maximum pressure bearing capacity greater than or equal to 0.6MPa, and a filter element replacement cycle of less than or equal to 3 months.

3. The method for treating industrial waste liquid based on electron irradiation technology according to claim 1, characterized in that: The pH regulator is a NaOH solution with a concentration of 1-5 mol / L or a H2SO4 solution with a concentration of 0.5-3 mol / L. During the adjustment process, a pH / ORP composite electrode is used for real-time monitoring, and the response time is controlled to be less than or equal to 2 seconds. When the COD of the waste liquid is greater than 2000 mg / L, it automatically switches to a gradient adjustment mode, that is, first adjusting to pH 5.5-6.5 for pre-oxidation, and then adjusting back to neutral.

4. The method for treating industrial waste liquid based on electron irradiation technology according to claim 1, characterized in that: The electron accelerator used in the dynamic irradiation stage is a compact linear accelerator with an energy adjustment range of 0.5-3MeV, continuously adjustable beam intensity, equipped with a radiation shielding cover with a lead equivalent of greater than or equal to 4mm and an automatic safety interlock device; the electron beam incident angle is controlled within the range of 30°-60° by an adjustable bracket to ensure that the irradiation uniformity is greater than or equal to 90%.

5. The method for treating industrial waste liquid based on electron irradiation technology according to claim 1, characterized in that: In the three-stage filtration system of the post-treatment stage: the first-stage fiber filtration layer adopts a polypropylene melt-blown filter element, the pore size distribution presents a normal curve, the filtration speed is less than or equal to 5m / h, and the pressure drop is less than or equal to 0.1MPa; the second-stage adsorption column is filled with modified zeolite, and the specific surface area reaches 800-1200m2 / g after activation with NaCl solution. After adsorption saturation, it is regenerated by 0.5-1mol / LNaCl solution, and the regeneration efficiency is greater than or equal to 85%; the TiO2 loading in the third-stage photocatalytic reactor is 5-15wt%, the light source is 12 20W low-pressure mercury lamps, the light intensity is 300-800W / m2, and the reaction temperature is controlled at 20-40℃.

6. An industrial waste liquid treatment system based on electron irradiation technology, applied to the industrial waste liquid treatment method based on electron irradiation technology according to any one of claims 1 to 5, characterized in that: include: The pretreatment unit is composed of a cyclone desander, a bag filter, a precision filter element filter and an online pH adjustment tank connected in sequence; The irradiation treatment unit consists of three electron accelerators connected in parallel, each equipped with an independent power supply control system and dose monitoring device; The post-processing unit includes a mechanical filtration device, an adsorption reaction bed and a deep purification device, and each unit is connected by a corrosion-resistant pump and an electromagnetic flowmeter.

7. The industrial waste liquid treatment system based on electron irradiation technology according to claim 6 is characterized by: The bag filter in the pretreatment unit is made of polypropylene, with a filtration accuracy of 30μm and a temperature resistance of 80°C. The filter element is replaced through a pneumatic quick-open device, which takes less than or equal to 5 minutes. The precision filter element filter uses a polyethersulfone folded filter element with a pore size of 0.45μm and a filtration efficiency greater than or equal to 99.9%.

8. The industrial waste liquid treatment system based on electron irradiation technology according to claim 6 is characterized by: The electron accelerator of the irradiation treatment unit is a compact linear accelerator with an energy adjustment range of 0.5-3MeV and continuously adjustable beam intensity. It is equipped with a radiation shielding cover with a lead equivalent of 5mm and an automatic safety interlock device. The electron beam scanning width is 0.5-2m, and uniform irradiation is achieved through a magnetic deflection system.

9. The industrial waste liquid treatment system based on electron irradiation technology according to claim 6 is characterized by: The mechanical filtration device of the post-treatment unit is filled with a ceramic microfiltration membrane, the transmembrane pressure difference is less than or equal to 0.1 MPa, and the backwashing cycle is 8-12 hours; the adsorption reaction bed is filled with modified activated carbon particles, which are reused through thermal regeneration after adsorption saturation, and the regeneration loss rate is less than 5%.

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