Device for deep nitrogen removal and new pollutant enhanced removal of urban sewage

Abstract

The utility model provides a kind of urban sewage depth denitrification coupling new pollutant enhanced removal device, including depth denitrification unit and new pollutant removal unit that are sequentially communicated, the new pollutant removal unit includes ozone dosing device and new pollutant removal reactor, and the new pollutant removal reactor includes ultraviolet lamp tube device and catalyst packing device that are sequentially communicated.The depth denitrification unit and new pollutant removal unit are set, and urban sewage total nitrogen and new pollutant are efficiently removed, to reach urban sewage treatment plant effluent discharge standard.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a device for deep denitrification of urban wastewater coupled with enhanced removal of new pollutants. Background Technology

[0002] China is a typical water-scarce country, making the need for wastewater resource utilization particularly urgent. This places new demands on the effectiveness of urban wastewater pollutant treatment. Currently, the emission limits for common pollutants such as COD, ammonia nitrogen, and total phosphorus in reclaimed water from urban wastewater treatment facilities are close to the levels of receiving water bodies, i.e., surface water environmental quality standards. However, the emission limit for total nitrogen pollutant is far higher than these standards. Therefore, ensuring the deep removal of total nitrogen from urban wastewater is one of the most pressing issues to be addressed in promoting the resource utilization of urban wastewater.

[0003] Meanwhile, emerging pollutants in the aquatic environment are gradually attracting attention. Although their concentrations are low, they can still have significant negative impacts on human health and the ecological environment. These emerging pollutants mainly include pharmaceuticals and personal care products (PPCPs), endocrine disruptors (EDCs), persistent pollutants (POPs), and perfluorinated compounds (PFCs), which can interfere with the reproductive development of organisms, damage the immune system, and pose a high risk of cancer. Studies have shown that among the 2,620 identified emerging pollutants, traditional wastewater treatment processes achieve a removal rate of less than 10% for 45% of them, indicating that trace amounts of these pollutants remain in wastewater treatment plant effluent, posing certain ecological risks to the reuse of wastewater.

[0004] A Chinese patent with publication number CN212151777U discloses a wastewater deep treatment denitrification system, including an anoxic tank, a denitrification chamber, an aerator and flusher, and an algal membrane bioreactor. One side of the anoxic tank is connected to one side of the denitrification chamber, and the other side of the denitrification chamber is connected to one side of the clarification chamber. The other side of the clarification chamber is connected to the algal membrane bioreactor. The aerator and flusher are installed inside the denitrification chamber and are connected to an ozone generator and a variable frequency blower through pipes. The bottom of the denitrification chamber is connected to a waste tank through a sewage pipe. A central controller and a nitrogen detector are installed on the outside of the clarification chamber. The nitrogen detector has a probe connected to the denitrification chamber and the algal membrane bioreactor.

[0005] Currently, there are no effective methods for treating new pollutants in wastewater treatment processes and equipment. Utility Model Content

[0006] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a device for deep denitrification of urban sewage coupled with enhanced removal of new pollutants.

[0007] According to the present invention, a deep denitrification coupled with enhanced removal of new pollutants for urban sewage is provided, comprising a deep denitrification unit and a new pollutant removal unit connected in sequence. The new pollutant removal unit includes an ozone dosing device and a new pollutant removal reactor, and the new pollutant removal reactor includes an ultraviolet lamp device and a catalyst packing device connected in sequence.

[0008] Preferably, the new pollutant removal reactor further includes a gas-liquid mixer and a product water tank, wherein the gas-liquid mixer is connected to a deep denitrification unit via an inlet pump, and the gas-liquid mixer is connected to the product water tank via a circulation pump;

[0009] The ozone dosing device is connected to a new pollutant removal reactor via a gas-liquid mixer, and the new pollutant removal reactor is connected to a product water tank.

[0010] Preferably, the ultraviolet lamp device and the catalyst packing device each include multiple devices, and two ultraviolet lamp devices are connected to each other through a catalyst packing device.

[0011] Preferably, the water production tank is connected to the discharge port.

[0012] Preferably, the catalyst packing device is filled with catalyst packing.

[0013] Preferably, the deep denitrification unit includes a carbon source dosing device, a water distribution tank, and a denitrification device connected in sequence, and the denitrification device is connected to the new pollutant removal unit through an outlet pipe.

[0014] Preferably, the deep denitrification unit further includes a water distributor, which is disposed below the denitrification device.

[0015] Preferably, the denitrification device is filled with denitrification packing material, which includes suspended packing material.

[0016] Preferably, the deep denitrification unit further includes an overflow port, which is located above the outlet pipe.

[0017] Preferably, the deep denitrification unit further includes an air vent, which is located below the water distributor.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. This utility model, by setting up a deep denitrification unit and a new pollutant removal unit, efficiently removes total nitrogen and new pollutants from urban sewage, achieving the effluent discharge standards of urban sewage treatment plants;

[0020] 2. This utility model sets up a deep denitrification unit including a denitrification device, which includes suspended packing material on which microorganisms attach and grow, forming a denitrification filter. The total nitrogen content in urban sewage is removed through microbial denitrification, which solves the problems of filter material clogging and filter material caking in the prior art.

[0021] 3. This utility model sets up a new pollutant removal unit, which includes an ozone dosing device, an ultraviolet lamp irradiation area, and a packing catalytic area. Ozone is introduced into the ultraviolet lamp irradiation area and the packing catalytic area. The ultraviolet light and the catalyst work together to catalyze the oxidation of new pollutants, which is conducive to more efficient removal of new pollutants and solves the problem of low oxidant utilization efficiency in the prior art.

[0022] 4. The treatment device of this utility model has the technical advantages of stable treatment effect, simple operation and maintenance, and efficient removal of total nitrogen and new pollutants. Attached Figure Description

[0023] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the main device of this utility model.

[0025] In the picture:

[0026] Deep denitrification unit 1, vent 16, product water tank 24

[0027] Water distribution tank 11, denitrification device 17, inlet pump 25

[0028] Water distributor 12, new pollutant removal unit 2, ultraviolet lamp device 26

[0029] Water outlet pipe 13, ozone dosing device 21, catalyst packing device 27

[0030] Overflow port 14, Circulation pump 22, Discharge port 28

[0031] Carbon source dosing device 15 Gas-liquid mixer 23 Detailed Implementation

[0032] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0033] like Figure 1As shown, the present invention provides a deep denitrification coupled with enhanced removal of new pollutants for urban wastewater, comprising a deep denitrification unit 1 and a new pollutant removal unit 2 connected in sequence. The new pollutant removal unit 2 includes an ozone dosing device 21 and a new pollutant removal reactor, which includes an ultraviolet lamp device 26 and a catalyst packing device 27 connected in sequence. Wastewater from the secondary sedimentation tank of urban wastewater enters the deep denitrification unit 1 to remove total nitrogen pollutants, and then enters the new pollutant removal unit 2. In the new pollutant removal unit 2, the wastewater with removed total nitrogen pollutants first undergoes advanced oxidation reaction using the ultraviolet lamp device 26 for new pollutant removal, and then undergoes enhanced removal of new pollutants using ozone catalytic oxidation reaction in the catalyst packing tube 27, achieving the required discharge standards.

[0034] Specifically, the deep denitrification unit 1 includes a water distribution tank 11, a water distributor 12, an outlet pipe 13, an overflow port 14, a carbon source dosing device 15, an air vent 16, and a denitrification device 17. The carbon source dosing device 15, the water distribution tank 11, the denitrification device 17, and the outlet pipe 13 are connected in sequence. The overflow port 14 is located above the outlet pipe 13, and the air vent 16 is located below the water distributor 12. The water distributor 12 is located below the denitrification device 17. The denitrification device 17 is filled with denitrification packing material, with a packing ratio of 40%-90%. Lightweight suspended packing material is preferred for the denitrification packing material. The carbon source for the carbon source dosing device 15 is preferably a liquid carbon source.

[0035] The permeate from the secondary sedimentation tank of urban sewage enters the distribution tank 11 of the deep denitrification unit 1. Simultaneously, an external carbon source is added to the distribution tank 11 via a carbon source dosing device 15. After mixing in the distribution tank 11, the mixture enters the denitrification device 17. Water is then evenly distributed to the denitrification device 17 via a distributor 12. In the denitrification device 17, the denitrification packing provides growth and attachment conditions for microorganisms, while the carbon source and nitrogen in the water provide substrates. Anaerobic microorganisms suitable for denitrification of urban sewage grow on the denitrification packing, effectively removing total nitrogen pollutants from the sewage. Simultaneously, the denitrification packing is a suspended packing material for microbial attachment and growth, forming a denitrification filter. Through microbial denitrification, the total nitrogen content in the urban sewage is removed, solving the problems of filter media clogging and caking present in existing technologies.

[0036] When an abnormal situation occurs that causes the water level of the deep denitrification unit 1 to rise continuously, the excess liquid can be discharged in an emergency through the overflow port 14; when it involves maintenance of the underwater part of the deep denitrification unit 1, the liquid in the deep denitrification unit 1 can be discharged in an emergency through the drain port 16.

[0037] Specifically, the new pollutant removal unit 2 includes a new pollutant removal reactor, an ozone dosing device 21, a circulation pump 22, a gas-liquid mixer 23, a product water tank 24, an inlet pump 25, and an outlet 28. The new pollutant removal reactor includes an ultraviolet lamp device 26 and a catalyst packing device 27. The gas-liquid mixer 23 is connected to the deep denitrification unit 1 via the inlet pump 25, and to the product water tank 24 via the circulation pump 22. The ozone dosing device 21 is connected to the new pollutant removal reactor via the gas-liquid mixer 23, and the new pollutant removal reactor is connected to the product water tank 24. Multiple ultraviolet lamp devices 26 and catalyst packing devices 27 are included, with two ultraviolet lamp devices 26 connected via a catalyst packing device 27, and two catalyst packing devices 27 connected via ultraviolet lamp devices 26.

[0038] The ozone generated by the ozone dosing device 21 is mixed in gaseous form with a portion of the permeate water transported by the circulating pump 22 via the gas-liquid mixer 23. This mixture is then mixed with the effluent from the deep denitrification unit 1 transported by the inlet pump 25 and enters the new pollutant removal reactor. First, the new pollutants are removed via an ultraviolet lamp device 26 using advanced oxidation reactions. Then, the new pollutants are further removed via an ozone-catalyzed oxidation reaction using a catalyst packing device 27. The effluent enters the permeate tank 24 and, after meeting emission standards, is discharged through the outlet 28. Ozone has strong oxidizing properties and can remove new pollutants, while ultraviolet light and the catalyst work together to catalyze the oxidation of new pollutants, resulting in faster removal.

[0039] The flow path of the permeate from the secondary sedimentation tank of urban sewage in the device of this utility model is as follows:

[0040] The permeate from the secondary sedimentation tank of urban sewage and the carbon source added by the carbon source addition device 15 flow together through the water distribution tank 11 of the deep denitrification unit 1 into the denitrification unit 17. The water distributor 12 evenly distributes the water to the denitrification unit 17, and finally flows out through the outlet pipe 13. It then enters the new pollutant removal unit 2 through the inlet pump 25. The effluent from the deep denitrification unit 1 is mixed with the effluent from the gas-liquid mixer 23 in the inlet pipe, and then passes sequentially through the irradiation area of ​​multiple series-connected ultraviolet lamp devices 26 and the catalytic area of ​​the packing material, and finally enters the permeate tank 24 to complete the entire treatment process. The ozone generated by the ozone addition device 21 and the water pumped from the permeate tank 24 by the circulation pump 22 are mixed in the gas-liquid mixer 23.

[0041] Working principle:

[0042] The wastewater from the secondary sedimentation tank of the wastewater treatment plant first enters the deep denitrification unit 1. Here, through the denitrification packing and the addition of a carbon source (the denitrification packing provides growth and attachment conditions for microorganisms, while the carbon source and nitrogen in the water provide growth substrates for microorganisms, which attach to the denitrification packing and carry out denitrification of nitrate nitrogen contained in the secondary sedimentation tank wastewater, reducing it to nitrogen gas and removing it, so that the total nitrogen in the effluent meets the predetermined standard), the nitrogen in the wastewater can be further removed to meet the effluent standard. Then, the effluent from the deep denitrification unit 1 enters the new pollutant removal unit 2. Here, the effluent is mixed with ozone (because ozone is a gas, in order to better mix with the wastewater, the water in the product water tank 24 is first transported by the circulation pump 22 and mixed with the ozone through the gas-liquid mixer 23 before being mixed with the effluent from the deep denitrification unit 1). After being mixed together, it passes through multiple series of ultraviolet lamp irradiation areas and packing catalysis areas, and finally enters the product water tank 24. Ozone has strong oxidizing properties and can remove new pollutants. Ultraviolet light and the action of catalysts work together to catalyze the oxidation of new pollutants, making them removed even faster.

[0043] This utility model provides a device for deep denitrification of urban sewage coupled with enhanced removal of new pollutants. Its purpose is to utilize the deep denitrification unit 1 and the new pollutant removal unit 2 to achieve efficient removal of total nitrogen and new pollutants from urban sewage through biofilm denitrification, ozone ultraviolet oxidation, and ozone catalytic oxidation, in order to cope with the increasingly stringent effluent discharge standards of current urban sewage treatment plants.

[0044] Taking the treatment device provided by this utility model for treating sewage from a town in the Beijing area as an example:

[0045] The final pollutant concentrations of the treated wastewater in the town were: total nitrogen 7 mg / L, azithromycin 3.5 ng / L, clindamycin 2.5 ng / L, and norfloxacin 2.1 ng / L.

[0046] Table 1. Effluent Indicators at Each Stage of the Implementation Case

[0047]

[0048] The permeate from the secondary sedimentation tank of urban sewage enters the water distribution tank 11 of the deep denitrification unit 1. At the same time, an external carbon source is added to the water distribution tank 11 of the deep denitrification unit 1 by the carbon source addition device 15. The concentration of the external carbon source is 25 mg / L. The water is evenly distributed into the denitrification device by the water distributor 12. Anaerobic microorganisms suitable for denitrification of urban sewage grow on the denitrification packing to form a microbial film and play a role in removing total nitrogen pollutants in sewage.

[0049] The ozone dosing device 21 is set to an ozone concentration of 6 mg / L. The generated ozone, in gaseous form, is mixed with a portion of the permeate water transported by the circulating pump 22 via the gas-liquid mixer 23, and then further mixed with the effluent from the deep denitrification unit 1 before entering the new pollutant removal reactor. First, the new pollutants are removed via an advanced oxidation reaction using a section equipped with ultraviolet lamps 26. Then, the new pollutants are further removed via an ozone catalytic oxidation reaction using a catalyst packing device 27. The effluent enters the permeate tank 24 and, after meeting the discharge standards, is discharged through the outlet 28.

[0050] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0051] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A device for deep denitrification of municipal wastewater coupled with enhanced removal of new pollutants, characterized in that, It includes a deep denitrification unit (1) and a new pollutant removal unit (2) connected in sequence. The new pollutant removal unit includes an ozone dosing device (21) and a new pollutant removal reactor. The new pollutant removal reactor includes an ultraviolet lamp device (26) and a catalyst packing device (27) connected in sequence.

2. The device according to claim 1, wherein the device is characterized by, The new pollutant removal reactor also includes a gas-liquid mixer (23) and a product water tank (24). The gas-liquid mixer (23) is connected to the deep denitrification unit (1) through an inlet pump (25), and the gas-liquid mixer (23) is connected to the product water tank (24) through a circulation pump (22). The ozone dosing device (21) is connected to a new pollutant removal reactor via a gas-liquid mixer (23), which is connected to a product water tank (24). 3.The device of claim 1, wherein The ultraviolet lamp device (26) and the catalyst packing device (27) include multiple units respectively. Two ultraviolet lamp devices (26) are connected to each other through the catalyst packing device (27), and two catalyst packing devices (27) are connected to each other through the ultraviolet lamp device (26).

4. The device according to claim 2, wherein the device is characterized by, The water production tank (24) is connected to the discharge port (28).

5. The device according to claim 1, wherein the device is characterized by the following: the device is used for deep nitrogen removal of municipal wastewater and enhanced removal of new pollutants. The catalyst packing device (27) is filled with catalyst packing.

6. The device according to claim 1, wherein the device is characterized by: The deep denitrification unit (1) includes a carbon source dosing device (15), a water distribution tank (11), and a denitrification device (17) connected in sequence. The denitrification device (17) is connected to the new pollutant removal unit (2) through a water outlet pipe (13).

7. The device according to claim 6, wherein the device is characterized by, The deep denitrification unit (1) also includes a water distributor (12), which is located below the denitrification device (17).

8. The device according to claim 6, wherein the device is characterized by, The denitrification device (17) is filled with denitrification packing, which includes suspended packing.

9. The device according to claim 6, wherein the device is characterized by the following: the device is used for deep nitrogen removal of municipal wastewater and enhanced removal of new pollutants. The deep denitrification unit (1) also includes an overflow port (14), which is located above the outlet pipe (13).

10. The device according to claim 7, wherein the device is characterized by the following: the device is used for deep nitrogen removal of municipal wastewater and enhanced removal of new pollutants. The deep denitrification unit (1) also includes an air vent (16), which is located below the water distributor (12).

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