Sewage recycling method and device based on synergistic effect of ultraviolet rays and reverse osmosis

Abstract

The invention relates to a sewage recycling method and device based on the synergistic effect of ultraviolet rays and reverse osmosis, and belongs to the technical field of sewage recycling. The problems that according to an existing reverse osmosis sewage recycling device, a reverse osmosis unit is poor in impact resistance, the sewage blocking rate is high, the adding amount of a reducing agent is increased, a non-oxidizing bactericide is prone to generating drug resistance, and recycled concentrated water is poor in biodegradability are solved. The device comprises an oxidation tank, the ultraviolet light reactor is used for carrying out circulating oxidation treatment on the sewage in the oxidation tank; the security filter is positioned at the downstream of the oxidation tank, is connected with the oxidation tank, and is used for filtering solid particles with the diameter of more than 0.5 mu m in water discharged from the oxidation tank; and the reverse osmosis unit is positioned at the downstream of the security filter, is connected with the security filter and is used for separating substances with the diameter of less than 0.0001 mu m in water discharged from the security filter. The sewage recycling device is high in impact resistance, a reducing agent and a non-oxidizing bactericide are not added, the biodegradability of reverse osmosis concentrated water is high, and stable and efficient operation can be achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of wastewater recycling, and specifically relates to a wastewater recycling method and device based on the synergistic effect of ultraviolet rays and reverse osmosis, and is particularly suitable for the recycling of wastewater from high-sulfur crude oil refining. Background Art

[0002] At present, most refining and chemical industries use "ultrafiltration + reverse osmosis" technology to implement wastewater reuse. However, when treating wastewater from high-sulfur crude oil refining enterprises, due to the desulfurization characteristics of the refining process, the wastewater contains trace amounts of hydrogen sulfide, organic matter, and heat-stable salts containing MEDA, and the water quality and water volume fluctuate greatly. The reverse osmosis reuse device has the following problems during operation: the reverse osmosis membrane has poor impact resistance and is prone to fouling; the safety filter element is prone to clogging and needs to be replaced frequently; the reused concentrated water has poor biodegradability. Therefore, improving the impact resistance of the reverse osmosis reuse device and ensuring the stable and efficient operation of the device are urgent issues to be solved in the wastewater reuse of the refining and chemical industry.

[0003] In the prior art, the methods for the reverse osmosis reuse device to deal with the fouling caused by the impact include: increasing the frequency and time of chemical cleaning of the reverse osmosis unit to clean the dirt on the reverse osmosis membrane to the maximum extent, but the cleaning effect is not good; replacing the blocked security filter element not only increases the cost, but also has an adverse effect on the long-term operation of the reverse osmosis; increasing the dosage of flocculant and oxidizing bactericide in the pretreatment unit to reduce the organic matter and particulate matter in the incoming water, but at the same time causing the dosage of reducing agent in the ultrafiltration unit to increase; adding non-oxidizing bactericide to the reverse osmosis unit, but non-oxidizing bactericides are prone to drug resistance and need to be replaced regularly.

[0004] In the prior art, there are two methods for treating reverse osmosis recycled concentrated water: one is to directly enter the reverse osmosis concentrated water into the biochemical system for treatment, but since the concentrated water contains nitrogen and phosphorus organic matter, the biodegradability of the sewage is poor, and substances such as heat-stable salts containing MEDA are gradually decomposed and release ammonia nitrogen in the biochemical process, which can easily cause the ammonia nitrogen in the biochemical effluent to exceed the standard, affecting the discharge of the standard; the other is to use the advantages of the advanced oxidation process with strong oxidation ability and high oxidation efficiency, using hydrogen peroxide as an oxidant, and the hydroxyl free radicals generated in the reaction attack the excited organic molecules to achieve the decomposition of organic matter in the sewage, so that the effluent meets the direct discharge standard, but this method has a long oxidation reaction time and a large amount of oxidant and catalyst added; and each chemical park has a supporting sewage treatment plant that can treat mixed wastewater containing COD of 220 to 600 mg / L, so the economic efficiency of treating the concentrated water to the direct discharge standard by the advanced oxidation process is poor, and the operating cost is high.

[0005] Patent CN 104418451 A discloses a method for treating reverse osmosis concentrated water, which includes the following steps: adding alkali to the reverse osmosis concentrated water to adjust the pH before entering the mixed reaction tank; performing solid-liquid separation after the mixed reaction; adding acid to the clear liquid to adjust the pH before entering the regulating tank, and using a micro-nano bubble generator to increase the reaction rate of ozone and organic pollutants in the wastewater, and a strong oxidation reaction occurs under the action of ultraviolet light; the organic pollutants in the wastewater are efficiently degraded, and the effluent can be directly discharged. However, the invention directly oxidizes the concentrated water to a COD of less than 50 mg / L, which has a high operating cost and is not suitable for the sewage treatment plants supporting refining enterprises.

[0006] In summary, when using the existing reverse osmosis wastewater reuse technology to treat wastewater from high-sulfur crude oil refining enterprises, there are the following technical problems:

[0007] 1. The reverse osmosis unit has poor impact resistance, is prone to fouling, has increased pressure difference, and has increased frequency of chemical cleaning with poor results;

[0008] 2. The filter element of the security filter is easy to be clogged and needs to be replaced frequently, which not only increases the cost, but also has an adverse effect on the long-term operation of reverse osmosis;

[0009] 3. The dosage of oxidizing bactericide in the pretreatment unit is large, which leads to an increase in the dosage of reducing agent in the effluent of the ultrafiltration unit;

[0010] 4. The reverse osmosis unit is prone to breeding bacteria, and the added non-oxidizing bactericide is prone to drug resistance. Changing the type of non-oxidizing bactericide can only slow down the growth of bacteria, but cannot fundamentally solve the problem of bacterial resistance; 5. The recycled concentrated water has poor biodegradability, which is not conducive to meeting discharge standards. Summary of the invention

[0011] The purpose of the present invention is to solve the problems of poor impact resistance of the reverse osmosis unit, high fouling rate, increased amount of reducing agent added, easy drug resistance of non-oxidizing fungicides, and poor biodegradability of recycled concentrated water when the existing reverse osmosis wastewater recycling technology is used to treat wastewater from high-sulfur crude oil refining enterprises. A wastewater recycling method and device based on the synergistic effect of ultraviolet rays and reverse osmosis are provided. The wastewater recycling device has strong impact resistance, does not require the addition of reducing agents and non-oxidizing fungicides, has high biodegradability of reverse osmosis concentrated water, and can operate stably and efficiently.

[0012] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows.

[0013] The present invention provides a sewage recycling device based on the synergistic effect of ultraviolet rays and reverse osmosis.

[0014] Includes oxidation tank;

[0015] An ultraviolet light reactor for cyclic oxidation treatment of sewage in the oxidation tank, wherein the wavelength of the ultraviolet light reactor is 200 to 400 nm;

[0016] A security filter located downstream of the oxidation tank and connected to the oxidation tank, wherein the security filter filters solid particles with a diameter greater than 0.5 μm in the effluent of the oxidation tank;

[0017] A reverse osmosis device is located downstream of the security filter and connected to the security filter, and the reverse osmosis device separates substances with diameters less than 0.0001 μm and substances with diameters greater than or equal to 0.0001 μm in the water discharged from the security filter.

[0018] Preferably, it further comprises an oxidant dosing system, wherein the oxidant dosing system is connected to the oxidation tank and is used for adding the oxidant into the oxidation tank.

[0019] Preferably, a booster pump is further included, and the water outlet from the security filter enters the reverse osmosis device through the booster pump.

[0020] Preferably, the sewage is sewage pretreated by ultrafiltration or filtration.

[0021] Preferably, the ultraviolet light reactor comprises a sewage pipe, two flanges, a sleeve, an ultraviolet lamp and a power supply; the sewage pipe is provided with a water outlet and a water inlet respectively connected to the oxidation tank, the sewage pipe, the sleeve and the ultraviolet lamp are sequentially arranged from the outside to the inside, and both ends are sealed and fixed on the two flanges respectively; the power supply is connected to the ultraviolet lamp to supply power to the ultraviolet lamp;

[0022] More preferably, the sewage pipe is made of one or more of quartz, polytetrafluoroethylene, and polyethylene; and the casing is made of quartz.

[0023] Preferably, the shell material of the security filter is 304 stainless steel, the filter element material is polypropylene cotton, and the filtration accuracy is above 5μm.

[0024] Preferably, the shell material of the reverse osmosis device is glass fiber reinforced plastic or stainless steel, the reverse osmosis membrane is Dow anti-pollution type, and the effective area is 400m 2 Above, the stable desalination rate is above 99.5%.

[0025] The present invention also provides a method for recycling sewage using the above-mentioned sewage recycling device based on the synergistic effect of ultraviolet rays and reverse osmosis, and the steps are as follows:

[0026] The sewage is added into the oxidation tank, and the oxidant is added into the oxidation tank, and the ultraviolet light reactor performs cyclic oxidation treatment on the sewage;

[0027] The effluent from the oxidation tank enters the safety filter to filter out solid particles with a diameter greater than 0.5 μm;

[0028] The effluent from the security filter enters the reverse osmosis device for separation. Substances with a diameter less than 0.0001 μm are able to pass through the reverse osmosis device to obtain desalted water, while the remaining substances are intercepted and concentrated to obtain concentrated water, thus completing the reuse of sewage.

[0029] Preferably, the desalted water is sent to the production workshop for use, and the concentrated water is sent to the biochemical unit for treatment.

[0030] Preferably, the hydraulic retention time of the oxidation tank is 0.5 to 2.0 h.

[0031] Preferably, the hydraulic retention time of the ultraviolet light reactor is 10 to 40 seconds.

[0032] Preferably, the reaction temperature of the oxidation tank is controlled to be 25-50° C.; more preferably, the control method is circulating water heat exchange cooling.

[0033] Preferably, the oxidant is hydrogen peroxide with a mass concentration of 10% to 30% mg / L; more preferably, 27.5% mg / L.

[0034] Preferably, the maximum pressure difference of the security filter is 2.4 MPa and the reaction temperature is 0-100°C.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The sewage reuse method and device of the present invention can oxidize and decompose trace hydrogen sulfide, macromolecular organic matter, and thermostable salt containing MEDA in sewage into small molecular intermediates with high biodegradability, thereby reducing the possibility of organic matter fouling the security filter and reverse osmosis membrane, and has a low fouling rate and a low replacement and cleaning frequency, thereby ensuring the long-term stable operation of the device and improving the biodegradability of reverse osmosis concentrated water.

[0037] 2. The sewage reuse method and device of the present invention use ultraviolet light with a wavelength of 254nm to destroy the molecular structure of DNA or RNA in the cells of microorganisms, causing the death of growing cells and regenerating cells, achieving the sterilization effect on the surface of the security filter element and the reverse osmosis membrane, replacing the non-oxidizing bactericide to achieve the sterilization effect, so the method and device do not need to add non-oxidizing bactericide.

[0038] 3. The wastewater recycling method and device of the present invention can achieve the ultraviolet light with a wavelength of 200 to 320 nm to remove residual chlorine (HOCl and OCl - ), so the method and device do not need to add a reducing agent.

[0039] 4. The sewage recycling method and device of the present invention can improve the biodegradability of the small molecular organic matter decomposed in the oxidation tank, and the concentrated water obtained by the reverse osmosis device can directly enter the biochemical system and be used as a high-quality carbon source. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some specific implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 It is a schematic structural diagram of the sewage recycling device based on the synergistic effect of ultraviolet rays and reverse osmosis of the present invention.

[0042] Figure 2 It is a schematic structural diagram of the ultraviolet reactor of the sewage recycling device based on the synergistic effect of ultraviolet rays and reverse osmosis of the present invention;

[0043] In the figure, 1. sewage pipe, 1-1. water outlet, 1-2. water inlet, 2. flange, 3. casing, 4. ultraviolet lamp, 5. power supply. DETAILED DESCRIPTION

[0044] In order to further understand the present invention, preferred embodiments of the present invention are described below. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0045] like Figure 1 As shown, the sewage recycling device based on the synergistic effect of ultraviolet rays and reverse osmosis of the present invention comprises an oxidation tank, a security filter and a reverse osmosis device. Among them, the oxidation tank is connected to an ultraviolet light reactor, and the ultraviolet light reactor performs cyclic oxidation treatment on the sewage in the oxidation tank, and the wavelength of the ultraviolet light reactor is 200-400nm; the security filter is located downstream of the oxidation tank and connected to the oxidation tank through a pipeline, and the security filter filters solid particles with a diameter greater than 0.5μm in the water discharged from the oxidation tank; the reverse osmosis device is located downstream of the security filter and connected to the security filter through a pipeline, and the reverse osmosis device separates substances with a diameter less than 0.0001μm and greater than or equal to 0.0001μm in the water discharged from the security filter.

[0046] In the above technical solution, the sewage is preferably sewage pre-treated by ultrafiltration or filtration, especially sewage from high-sulfur crude oil refining pre-treated by ultrafiltration or filtration.

[0047] In the above technical solution, in order to facilitate the addition of the oxidant, the preferred device also includes an oxidant addition system, which is connected to the oxidation tank and is used to add the oxidant into the oxidation tank.

[0048] In the above technical solution, in order to facilitate the water outlet of the security filter to enter the reverse osmosis device, it is preferably also included a booster pump, and the water outlet of the security filter enters the reverse osmosis device through the booster pump.

[0049] like Figure 2 As shown, the ultraviolet light reactor in the above technical solution includes a sewage pipe 1, two flanges 2, a sleeve 3, an ultraviolet lamp 4 and a power supply 5; wherein, the sewage pipe 1 is provided with an outlet 1-1 and an inlet 1-2 respectively connected to the oxidation tank; the sewage pipe 1, the sleeve 3, and the ultraviolet lamp 4 are sequentially arranged from the outside to the inside, and both ends are sealed and fixed on the two flanges 2 respectively; the power supply 5 is connected to the ultraviolet lamp 4 to supply power to the ultraviolet lamp 4. Preferably, the sewage pipe 1 is made of one or more of quartz, polytetrafluoroethylene, and polyethylene; the sleeve 3 is made of quartz. The sewage flows out of the oxidation tank, enters the sewage pipe 1 from the water inlet 1-2, and flows in the gap between the sewage pipe 1 and the sleeve 3. During the flow process, the ultraviolet lamp 4 emits ultraviolet light to oxidize the sewage, and then flows back to the oxidation tank through the outlet 1-1. The sleeve 3 protects the ultraviolet lamp 4 to isolate the wastewater.

[0050] In the above technical solution, the shell material of the security filter is 304 stainless steel, the filter element material is preferably polypropylene (PP) cotton, and the filtration accuracy is above 5μm.

[0051] In the above technical solution, the shell material of the reverse osmosis device is preferably glass fiber reinforced plastic or stainless steel, and the reverse osmosis membrane is preferably Dow anti-pollution type, such as BW30-400 / 34, with an effective area of ​​400m 2 Above, the stable desalination rate is above 99.5%.

[0052] The sewage recycling method based on the synergistic effect of ultraviolet rays and reverse osmosis of the present invention adopts the above-mentioned device, and the steps are as follows:

[0053] The sewage is added into the oxidation tank, and the oxidant is added into the oxidation tank. The ultraviolet light reactor performs cyclic oxidation treatment on the sewage. The hydrogen sulfide, macromolecular organic matter and heat-stable salt containing MEDA in the sewage are oxidized and decomposed into small molecular intermediates with high biodegradability.

[0054] The effluent from the oxidation tank enters the safety filter to filter out solid particles with a diameter greater than 0.5 μm;

[0055] The effluent from the security filter enters the reverse osmosis membrane for separation. Substances with a diameter less than 0.0001μm (including water) can pass through the reverse osmosis membrane to obtain desalted water, while the remaining substances (organic matter, salt, etc.) are intercepted and concentrated to obtain concentrated water, completing the reuse of sewage.

[0056] The desalted water is then sent to the production workshop for use, and the concentrated water is sent to the biochemical unit for treatment.

[0057] In the above technical scheme, the hydraulic retention time of the ultraviolet reactor is preferably 10 to 40 seconds. The hydraulic retention time of the oxidation tank is preferably 0.5 to 2.0 hours. The preferred oxidant is hydrogen peroxide with a mass concentration of 10% to 30% mg / L; more preferably 27.5% mg / L. The reaction temperature of the oxidation tank is preferably 25 to 50°C, and the preferred control method is circulating water heat exchange cooling. The maximum pressure difference of the security filter is preferably 2.4MPa, and the reaction temperature is 0 to 100°C.

[0058] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings.

[0059] In the following examples, various processes and methods not described in detail are conventional methods known in the art. Unless otherwise specified, the materials, reagents, devices, instruments, equipment, etc. used in the following examples can be obtained from commercial sources.

[0060] Example 1

[0061] The wastewater produced by a refinery has an ultrafiltration effluent with MEDA and thermally stable salt content of 5-10 mg / L.

[0062] The above ultrafiltration effluent is treated by using the sewage recycling device based on the synergistic effect of ultraviolet rays and reverse osmosis of the present invention, and the treatment method is as follows:

[0063] The ultrafiltration water is added into the oxidation tank, and the oxidant is added into the oxidation tank, and the ultraviolet reactor performs cyclic oxidation treatment on the sewage; the hydraulic retention time of the oxidation tank is 2.0h, the reaction temperature is 50℃, the oxidant is hydrogen peroxide, the mass concentration of the oxidant is 27.5% mg / L, and the hydraulic retention time of the ultraviolet reactor is 40s;

[0064] The water from the oxidation tank enters the security filter (the filter element is made of PP cotton) to filter solid particles with a diameter greater than 0.5μm;

[0065] The effluent from the security filter enters the reverse osmosis device for separation (the reverse osmosis membrane is Dow anti-pollution type BW30-400 / 34, with an effective area of ​​400m 2 The above, stable desalination rate is above 99.5%), substances with a diameter less than 0.0001μm (including water) can pass through the reverse osmosis membrane to obtain desalted water, and the remaining substances (organic matter, salt, etc.) are intercepted and concentrated to obtain concentrated water, completing the reuse of sewage;

[0066] The desalted water is then sent to the production workshop for use, and the concentrated water is sent to the biochemical unit for treatment.

[0067] After testing: the yield of desalted water is >70%; the COD in the concentrated water is 790mg / L, the B / C is 0.49, the biodegradability is significantly improved, and it can be used as a biochemical carbon source; the cleaning cycle of the reverse osmosis membrane of the reverse osmosis device is 2 months / time; the filter element replacement cycle of the security filter is 3 months / time.

[0068] Example 2

[0069] The wastewater produced by a refinery has MEDA and thermally stable salt content of ultrafiltration effluent of 0.1-0.5 mg / L.

[0070] The above ultrafiltration effluent is treated by the sewage recycling device based on the synergistic effect of ultraviolet rays and reverse osmosis of the present invention, and the treatment method is the same as that of Example 1.

[0071] The operating parameters are: the hydraulic retention time of the oxidation tank is 0.5h, the reaction temperature is 25°C, the oxidant is hydrogen peroxide with a mass concentration of 27.5% mg / L, and the hydraulic retention time of the ultraviolet reactor is 10s.

[0072] After testing: the yield of desalted water is >70%; the COD in the concentrated water is 680mg / L, the B / C is 0.40, the biodegradability is significantly improved, and it can be used as a biochemical carbon source; the cleaning cycle of the reverse osmosis membrane of the reverse osmosis device is 3 months / time; the filter element replacement cycle of the security filter is 4 months / time.

[0073] Example 3

[0074] A refinery produces wastewater, and the ultrafiltration effluent has a MEDA and thermally stable salt content of 2-5 mg / L.

[0075] The above ultrafiltration effluent is treated by the sewage recycling device based on the synergistic effect of ultraviolet rays and reverse osmosis of the present invention, and the treatment method is the same as that of Example 1.

[0076] The operating parameters are: the hydraulic retention time of the oxidation tank is 1.0h, the reaction temperature is 30°C, the oxidant is hydrogen peroxide with a mass concentration of 27.5% mg / L, and the hydraulic retention time of the ultraviolet reactor is 25s.

[0077] After testing: the yield of desalted water is >70%; the COD in the concentrated water is 750mg / L, the B / C is 0.45, the biodegradability is significantly improved, and it can be used as a biochemical carbon source; the cleaning cycle of the reverse osmosis membrane of the reverse osmosis device is 2 months / time; the filter element replacement cycle of the security filter is 4 months / time.

[0078] Comparative Example 1

[0079] The wastewater produced by a refinery has an ultrafiltration effluent with MEDA and thermally stable salt content of 5-10 mg / L.

[0080] The existing reverse osmosis wastewater reuse device is used for treatment, and the steps are as follows:

[0081] The ultrafiltration effluent enters the security filter to filter out solid particles with a diameter greater than 0.5 μm;

[0082] The water from the security filter enters the reverse osmosis device through a booster pump for separation. Substances with a diameter less than 0.0001μm can pass through the reverse osmosis membrane to obtain desalted water, and the remaining substances are intercepted and concentrated to obtain concentrated water, completing the reuse of sewage.

[0083] The desalted water is then sent to the production workshop for use, and the concentrated water is sent to the biochemical unit for treatment.

[0084] The treatment effects of Comparative Example 1 and Example 1 were compared and analyzed, and the results are shown in Table 1 and Table 2.

[0085] Table 1 Comparison of treatment effects between comparative example 1 and embodiment 1

[0086]

[0087] Table 2 Detection and analysis results of foreign bacteria in each water sample of Example 1 and Comparative Example 1

[0088]

[0089] By comparing the treatment effects of Example 1 and Comparative Example 1, it can be seen that when the existing reverse osmosis wastewater reuse technology is used, the frequency of reverse osmosis cleaning and filter element replacement is high, the amount of non-oxidizing bactericide and reducing agent added is large, the number of foreign bacteria is large, and the biodegradability of concentrated water is poor; the frequency of reverse osmosis cleaning and filter element replacement of the present invention is low, no non-oxidizing bactericide and reducing agent are added, the number of foreign bacteria is low, the biodegradability of concentrated water is high, and the stability and economy of the device are better than the existing process.

[0090] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the embodiments. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A sewage recycling device based on the synergistic effect of ultraviolet rays and reverse osmosis, characterized in that: Includes oxidation tank; An ultraviolet light reactor for cyclic oxidation treatment of sewage in the oxidation tank, wherein the wavelength of the ultraviolet light reactor is 200 to 400 nm; A security filter located downstream of the oxidation tank and connected to the oxidation tank, wherein the security filter filters solid particles with a diameter greater than 0.5 μm in the effluent of the oxidation tank; A reverse osmosis device is located downstream of the security filter and connected to the security filter, and the reverse osmosis device separates substances with diameters less than 0.0001 μm and substances with diameters greater than or equal to 0.0001 μm in the water discharged from the security filter.

2. The sewage recycling device based on the synergistic effect of ultraviolet rays and reverse osmosis according to claim 1 is characterized in that: It also includes an oxidant adding system, which is connected to the oxidation tank and is used to add oxidant into the oxidation tank.

3. The sewage recycling device based on the synergistic effect of ultraviolet rays and reverse osmosis according to claim 1 is characterized in that: It also includes a booster pump, and the water output from the security filter enters the reverse osmosis device through the booster pump.

4. The sewage recycling device based on the synergistic effect of ultraviolet rays and reverse osmosis according to claim 1 is characterized in that: The sewage is sewage pre-treated by ultrafiltration or filtration.

5. The sewage recycling device based on the synergistic effect of ultraviolet rays and reverse osmosis according to claim 1 is characterized in that: The ultraviolet light reactor comprises a sewage pipe (1), two flanges (2), a sleeve (3), an ultraviolet lamp (4) and a power supply (5); the sewage pipe (1) is provided with a water outlet (1-1) and a water inlet (1-2) respectively connected to an oxidation tank; the sewage pipe (1), the sleeve (3) and the ultraviolet lamp (4) are sequentially arranged from the outside to the inside, and both ends are respectively sealed and fixed on the two flanges (2); the power supply (5) is connected to the ultraviolet lamp (4) to supply power to the ultraviolet lamp (4).

6. The sewage recycling device based on the synergistic effect of ultraviolet rays and reverse osmosis according to claim 5 is characterized in that: The material of the sewage pipe (1) is one or more of quartz, polytetrafluoroethylene, and polyethylene; the material of the casing (3) is quartz.

7. The sewage recycling device based on the synergistic effect of ultraviolet rays and reverse osmosis according to claim 1 is characterized in that: The shell material of the security filter is 304 stainless steel, the filter element material is polypropylene cotton, and the filtration accuracy is above 5μm; The shell of the reverse osmosis device is made of glass fiber reinforced plastic or stainless steel, and the reverse osmosis membrane is Dow anti-pollution type with an effective area of ​​400m 2 Above, the stable desalination rate is above 99.5%.

8. A method for recycling sewage using the sewage recycling device based on the synergistic effect of ultraviolet rays and reverse osmosis according to any one of claims 1 to 7, characterized in that: Here are the steps: The sewage is added into the oxidation tank, and the oxidant is added into the oxidation tank, and the ultraviolet light reactor performs cyclic oxidation treatment on the sewage; The effluent from the oxidation tank enters the safety filter to filter out solid particles with a diameter greater than 0.5 μm; The effluent from the security filter enters the reverse osmosis device for separation. Substances with a diameter less than 0.0001 μm are able to pass through the reverse osmosis device to obtain desalted water, while the remaining substances are intercepted and concentrated to obtain concentrated water, thus completing the reuse of sewage.

9. The method for wastewater reuse according to claim 8, characterized in that: The desalted water is sent to the production workshop for use, and the concentrated water is sent to the biochemical unit for treatment.

10. The method for wastewater reuse according to claim 8, characterized in that: The hydraulic retention time of the oxidation tank is 0.5 to 2.0 hours; And / or, the hydraulic retention time of the ultraviolet light reactor is 10 to 40 seconds; and / or, controlling the reaction temperature of the oxidation tank to 25-50° C.; And / or, the oxidant is hydrogen peroxide with a mass concentration of 10% to 30% mg / L; And / or, the maximum pressure difference of the security filter is 2.4 MPa, and the reaction temperature is 0-100°C.

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