Sewage treatment device

Abstract

The utility model relates to the field of sewage treatment, and particularly discloses a sewage treatment device which comprises an anaerobic tank, a primary contact oxidation tank, a secondary contact oxidation tank, a stirring tank, a rear denitrification membrane separation tank, a clean water tank and a carbon source feeding system, combined fillers are arranged in the anaerobic tank, the primary contact oxidation tank and the secondary contact oxidation tank; a first-stage sludge return system is arranged between the anaerobic tank and the second-stage contact oxidation tank, the rear denitrification membrane separation tank is provided with a second-stage sludge return system, and the second-stage sludge return system is used for returning sludge to the anaerobic tank and the first-stage contact oxidation tank; the carbon source adding system is connected with the stirring tank; the rear denitrification membrane separation tank is provided with a water producing pump and a backwashing pump, the rear denitrification membrane separation tank conveys outlet water to the clean water tank through the water producing pump, and the backwashing pump is connected with the clean water tank; the sewage treatment device is of great significance to standard discharge of rural domestic sewage.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and specifically to a wastewater treatment device. Background Technology

[0002] Rural domestic sewage is characterized by large fluctuations in volume and unstable water quality. Due to inadequate rural sewage collection networks, the sewage often mixes with large amounts of rainwater, leading to an imbalance in the carbon-to-nitrogen ratio. This makes it difficult to start up and stably operate biological treatment processes. Furthermore, the lack of carbon sources prevents activated sludge from undergoing denitrification, resulting in total nitrogen levels failing to meet treatment requirements. In addition, the mixing of industrial wastewater causes influent nitrogen and phosphorus levels to exceed design standards, making it impossible for sewage treatment facilities to consistently meet discharge standards. Current rural sewage discharge standards are relatively lenient in controlling total nitrogen; therefore, many rural sewage treatment facilities are often designed without specific measures to address total nitrogen levels.

[0003] In conclusion, considering the specific characteristics of rural domestic sewage, adopting appropriate sewage treatment equipment is of great significance for ensuring that sewage is treated to meet discharge standards. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a sewage treatment device that can specifically treat rural domestic sewage.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A wastewater treatment device includes: an anaerobic tank, a primary contact oxidation tank, a secondary contact oxidation tank, a stirring tank, a post-denitrification membrane separation tank, a clear water tank, and a carbon source addition system.

[0007] The anaerobic tank, primary contact oxidation tank, secondary contact oxidation tank, stirring tank, and post-denitrification membrane separation tank are connected in sequence.

[0008] The anaerobic tank, the primary contact oxidation tank, and the secondary contact oxidation tank are all equipped with combined packing materials.

[0009] The primary contact oxidation tank, the secondary contact oxidation tank, and the post-denitrification membrane separation tank are all equipped with aeration components.

[0010] A mixer is installed on the mixing tank.

[0011] The post-denitrification membrane separation tank is equipped with a submersible propeller and a membrane separation device.

[0012] A primary sludge return system is provided between the anaerobic tank and the secondary contact oxidation tank, and a secondary sludge return system is provided in the post-denitrification membrane separation tank. The secondary sludge return system is used to return sludge to the anaerobic tank and the primary contact oxidation tank.

[0013] The carbon source dosing system is connected to the stirring tank, and the carbon source dosing system adds carbon source to the stirring tank.

[0014] The post-denitrification membrane separation tank has a product water pump and a backwash pump. The product water pump delivers the effluent from the post-denitrification membrane separation tank to the clear water tank. The backwash pump is connected to the clear water tank and is used to backwash the membrane separation device.

[0015] In at least one embodiment of the wastewater treatment apparatus provided in this disclosure, the post-denitrification membrane separation tank is equipped with a level gauge.

[0016] In at least one embodiment of the wastewater treatment apparatus provided in this disclosure, an inlet pipe is provided on the anaerobic tank, and an outlet is provided on the clear water tank.

[0017] In at least one embodiment of the wastewater treatment apparatus provided in this disclosure, a first overflow outlet is provided between the anaerobic tank and the primary contact oxidation tank, and the anaerobic tank and the primary contact oxidation tank are connected through the first overflow outlet.

[0018] In at least one embodiment of the wastewater treatment apparatus provided in this disclosure, a first flow port is provided at the bottom of the primary contact oxidation tank and the secondary contact oxidation tank, and the primary contact oxidation tank and the secondary contact oxidation tank are connected through the first flow port.

[0019] In at least one embodiment of the wastewater treatment apparatus provided in this disclosure, a second overflow port is provided between the secondary contact oxidation tank and the stirring tank, and the secondary contact oxidation tank and the stirring tank are connected through the second overflow port.

[0020] In at least one embodiment of the wastewater treatment apparatus provided in this disclosure, a second flow port is provided at the bottom of the stirring tank and the post-denitrification membrane separation tank, and the stirring tank and the post-denitrification membrane separation tank are connected through the second flow port.

[0021] In at least one embodiment of the wastewater treatment apparatus provided in this disclosure, the aeration component includes an aeration disc and an aeration blower, and the aeration disc and the aeration blower are connected.

[0022] In at least one embodiment of the wastewater treatment device provided in this disclosure, two submersible jet mixers are provided, and the two submersible jet mixers are respectively located at the bottom left and right ends of the post-denitrification membrane separation tank.

[0023] The second flow outlet is located below the submersible thruster.

[0024] The beneficial effects of this utility model are as follows:

[0025] This device is designed for the treatment of rural domestic sewage with a carbon-to-nitrogen ratio (C / N) < 2. It employs a process of hydrolysis acidification + two-stage contact oxidation + post-denitrification membrane separation, which is of great significance for ensuring that rural domestic sewage meets discharge standards.

[0026] Membrane separation filters out organic matter, ensuring that the effluent COD meets standards, while simultaneously retaining carbon sources within the tank for efficient utilization. Membrane separation also increases the sludge concentration in the denitrification process, leading to a higher number of denitrifying bacteria and thus improving the efficiency of the denitrification reaction. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the internal structure of a wastewater treatment device according to the present invention.

[0029] Figure 2 This is a view of a wastewater treatment device according to the present invention.

[0030] In the picture:

[0031] 1. Inlet pipe; 2. Anaerobic tank; 3. Combined packing material; 4. First overflow port; 5. Primary contact oxidation tank; 7. Aeration disc; 8. Aeration blower; 9. Secondary contact oxidation tank; 11. Aeration disc; 12. Secondary contact oxidation tank return port; 13. Anaerobic tank return port; 14. Primary return pump; 15. Primary sludge return system; 16. Second overflow port; 17. Mixing tank; 18. Carbon source addition system; 19. Stirring 20. Mixer; 21. Post-denitrification membrane separator; 22. Submersible jet mixer; 23. Membrane separator; 24. Permeate pump; 25. Backwash pump; 26. Level gauge; 27. Secondary sludge return system; 28. Sludge return port of post-denitrification membrane separator; 29. ​​Secondary sludge return pump; 30. Sludge return port of primary contact oxidation tank; 31. Sludge discharge port; 32. Sludge discharge pump; 33. Clear water tank; 34. Discharge port. Detailed Implementation

[0032] The technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments, not all embodiments.

[0033] Example

[0034] like Figure 1 and 2 As shown, a wastewater treatment device includes an anaerobic tank 3, a primary contact oxidation tank 5, a secondary contact oxidation tank 9, a stirring tank 17, a post-denitrification membrane separation tank 20, a clear water tank 33, and a carbon source addition system 18.

[0035] Anaerobic tank 3, primary contact oxidation tank 5, secondary contact oxidation tank 9, stirring tank 17, and post-denitrification membrane separation tank 20 are connected in sequence. Anaerobic tank 3 serves as a hydrolysis acidification tank.

[0036] The anaerobic tank 3, the primary contact oxidation tank 5, and the secondary contact oxidation tank 9 are all equipped with combined packing material 2.

[0037] Aeration components are installed in the primary contact oxidation tank 5, the secondary contact oxidation tank 9, and the post-denitrification membrane separation tank 20.

[0038] A mixer 19 is installed on the mixing tank 17.

[0039] The post-denitrification membrane separation tank 20 is equipped with a submersible propeller 21 and a membrane separation device 22.

[0040] The carbon source dosing system 18 is connected to the stirring tank 17, and the carbon source dosing system 18 adds carbon source to the stirring tank 17.

[0041] The post-denitrification membrane separation tank 20 has a product water pump 23 and a backwash pump 24; the post-denitrification membrane separation tank 20 delivers the effluent to the clear water tank 33 through the product water pump 23; the backwash pump 24 is connected to the clear water tank 33 and is used to backwash the membrane separation device 22.

[0042] In this embodiment, a primary sludge return system 15 is provided between the anaerobic tank 3 and the secondary contact oxidation tank 9, and a secondary sludge return system 26 is provided in the post-denitrification membrane separation tank 20. The secondary sludge return system 26 is used to return sludge to the anaerobic tank 3 and the primary contact oxidation tank 5.

[0043] Anaerobic tank 3 has an anaerobic tank return port 13; primary contact oxidation tank 5 has a primary contact oxidation tank sludge return port 29; secondary contact oxidation tank 9 has a secondary contact oxidation tank return port 12; post-denitrification membrane separation tank 20 has a post-denitrification membrane separation tank sludge return port 27; secondary sludge return system 26 has a secondary sludge return pump 28; primary sludge return system 15 has a primary return pump 14; the post-denitrification membrane separation tank is connected in sequence to a sludge discharge port 31 and a sludge discharge pump 32.

[0044] In this embodiment, the post-denitrification membrane separation tank 20 is equipped with a level gauge 25.

[0045] In this embodiment, the anaerobic tank 3 is equipped with an inlet pipe 1, and the clear water tank 33 is equipped with an outlet 34.

[0046] In this embodiment, a first overflow port 4 is provided between the anaerobic tank 3 and the primary contact oxidation tank 5, and the anaerobic tank 3 and the primary contact oxidation tank 5 are connected through the first overflow port 4.

[0047] In this embodiment, the bottom of the primary contact oxidation tank 5 and the secondary contact oxidation tank 9 are provided with a first flow port, and the primary contact oxidation tank 5 and the secondary contact oxidation tank 9 are connected through the first flow port.

[0048] In this embodiment, a second overflow port 16 is provided between the secondary contact oxidation tank 9 and the stirring tank 17, and the secondary contact oxidation tank 9 and the stirring tank 17 are connected through the second overflow port 16.

[0049] In this embodiment, the bottom of the stirring tank 17 and the post-denitrification membrane separation tank 20 are provided with a second flow port, and the stirring tank 17 and the post-denitrification membrane separation tank 20 are connected through the second flow port.

[0050] In this embodiment, the aeration assembly includes an aeration disc 7 and an aeration fan 8, which are connected together.

[0051] In this embodiment, two submersible propellers 21 are provided, and the two submersible propellers 21 are respectively located at the bottom left and right ends of the post-denitrification membrane separation tank 20.

[0052] The second flow outlet is located below the submersible thruster 21.

[0053] The specific working method of the wastewater treatment device in the embodiments will be disclosed below to further illustrate the principle of the wastewater treatment device.

[0054] The wastewater treatment device in this embodiment is designed for rural domestic wastewater with a carbon-to-nitrogen ratio (C / N) < 2, and employs a process of hydrolysis acidification + two-stage contact oxidation + post-denitrification membrane separation.

[0055] Wastewater enters the hydrolysis acidification tank through inlet pipe 1. The inside of the hydrolysis acidification tank is filled with combined packing material 2, which provides a place for anaerobic microorganisms to attach and grow. The dissolved oxygen in the anaerobic tank 3 is controlled below 0.2 mg / L. The wastewater reacts with anaerobic microorganisms in two stages: hydrolysis and acidification. Suspended organic matter and macromolecules in the wastewater are hydrolyzed into smaller molecules by extracellular enzymes of microorganisms, and organic nitrogen in the wastewater is decomposed. At the same time, under anaerobic conditions, polyphosphate-accumulating bacteria complete the release of phosphorus.

[0056] After treatment in the hydrolysis acidification tank, the wastewater flows from the first overflow outlet 4 into the primary contact oxidation tank 5. The primary contact oxidation tank 5 is equipped with combined packing material for aerobic microorganisms to attach and grow. Aeration discs 7 are installed at the bottom of the tank, connected to an aeration blower 8 to supply oxygen to the tank. The dissolved oxygen level in the tank is controlled at 2-5 mg / L, and the sludge concentration is controlled at 3000-5000 mg / L. The primary contact oxidation tank 5 enriches sludge bacteria adapted to high-concentration wastewater. Through microbial degradation, organic matter in the water is initially removed, ammonia nitrogen is converted to nitrate nitrogen through nitrification, and total phosphorus is absorbed by polyphosphate-accumulating bacteria.

[0057] The primary contact oxidation tank 5 and the secondary contact oxidation tank 9 are connected in series. The secondary contact oxidation tank 9 is filled with combined packing material for aerobic microorganisms to attach and grow. Aeration discs are installed at the bottom of the tank, connected to an aeration blower to supply oxygen to the tank. The dissolved oxygen in the tank is controlled at 2-5 mg / L, and the sludge concentration is controlled at 3000-5000 mg / L. The secondary contact oxidation tank 9 enriches sludge bacteria adapted to low-concentration wastewater. Through microbial degradation, organic matter in the water is further removed. Ammonia nitrogen is converted into nitrate nitrogen through nitrification, while polyphosphate-accumulating bacteria absorb total phosphorus. The secondary contact oxidation tank 9 is equipped with a sludge discharge pipe connected to the bottom of the hydrolysis acidification tank, forming the primary sludge return system 15. The nitrified liquid after nitrification is returned to the hydrolysis acidification tank. In the anoxic environment of the hydrolysis acidification tank, the sludge uses the carbon source of the influent to carry out denitrification, converting nitrate nitrogen into nitrogen gas, thus removing total nitrogen.

[0058] When the influent C / N ratio is less than 2, due to insufficient carbon source in the influent, the primary sludge return alone cannot effectively remove total nitrogen. Therefore, the sludge-water mixture after passing through the secondary contact oxidation tank 9 overflows through the second overflow port 16 to the mixing tank 17. Carbon source is added to the mixture through the carbon source addition system 18. The mixing tank 17 is equipped with a mixer to ensure that the carbon source is fully and evenly mixed with the sludge-water mixture.

[0059] The bottom of the mixing tank 17 is connected to the post-denitrification membrane separation tank 20. Two submersible jet mixers 21 are installed at both ends of the bottom of the post-denitrification membrane separation tank 20 to ensure a more uniform and thorough denitrification reaction, maintaining dissolved oxygen levels below 0.2 mg / L. In this anoxic environment, denitrifying bacteria convert nitrate nitrogen into nitrogen gas through denitrification. A membrane separation device 22 is installed in the middle of the post-denitrification membrane separation tank 20. This device is connected to the permeate pump 23 and the backwash pump 24, and its operation is controlled by a combination of a level gauge 25 and a control device (not shown). When the liquid level in the post-denitrification membrane separation tank 20 reaches the set level, the membrane separation device 22 starts, using pressure to filter the wastewater to the next unit. Traditional post-backwashing methods carry the risk of carbon source breakthrough, meaning the denitrification reaction cannot fully utilize the added carbon source, which flows out with the effluent, resulting in excessively high COD in the effluent and wasting the carbon source. By utilizing the filtration effect of membrane separation, organic matter is intercepted, ensuring that the effluent COD meets standards while retaining carbon sources within the tank, allowing for their full utilization. The membrane separation process increases the sludge concentration in the denitrification process, leading to a higher number of denitrifying bacteria and improved denitrification efficiency. The retained carbon sources can continue to participate in the reaction within the tank, or they can be returned to the hydrolysis acidification tank and the primary contact oxidation tank 5 via the secondary sludge return system 26 installed at the bottom of the subsequent denitrification membrane separation tank 20. This provides carbon sources for the primary denitrification reaction constructed by the primary sludge return and for the microbial growth in the primary contact oxidation tank 5. Simultaneously, the secondary sludge return system 26 replenishes sludge to the hydrolysis acidification tank and the two-stage contact oxidation tanks. An aeration disc is also installed at the bottom of the post-denitrification tank for aeration and oxygenation when dissolved oxygen is insufficient. It can also be used for cleaning and aeration of the membrane separation device 22.

[0060] When the sludge concentration in the entire device is too high, the remaining sludge is discharged through the sludge discharge pump 32 set at the bottom of the post-denitrification membrane separator.

[0061] The post-denitrification membrane separator 20 delivers effluent to the clear water tank 33 via the product water pump 23. The backwash pump 24 is connected to the clear water tank 33 and can backwash the membrane separation unit 22. The clear water tank 33 is equipped with an effluent discharge pipe, which overflows and discharges in compliance with standards when the effluent level reaches the pipe opening.

[0062] Although embodiments of this application have been shown and described above, the scope of protection of this utility model is not limited thereto. Any changes or substitutions that can be conceived without inventive effort should be included within the scope of protection of this utility model. Unless expressly stated otherwise, no element, action or instruction used herein should be construed as critical or necessary.

Claims

1. A wastewater treatment device, characterized in that, include: Anaerobic tank, primary contact oxidation tank, secondary contact oxidation tank, stirring tank, post-denitrification membrane separation tank, clear water tank and carbon source addition system; The anaerobic tank, primary contact oxidation tank, secondary contact oxidation tank, stirring tank, and post-denitrification membrane separation tank are connected in sequence; The anaerobic tank, the primary contact oxidation tank, and the secondary contact oxidation tank are all equipped with combined packing materials. The primary contact oxidation tank, the secondary contact oxidation tank, and the post-denitrification membrane separation tank are all equipped with aeration components. The mixing tank is equipped with a mixer; The post-denitrification membrane separation tank is equipped with a submersible flow generator and a membrane separation device. A primary sludge return system is provided between the anaerobic tank and the secondary contact oxidation tank, and a secondary sludge return system is provided in the post-denitrification membrane separation tank. The secondary sludge return system is used to return sludge to the anaerobic tank and the primary contact oxidation tank. The carbon source dosing system is connected to the stirring tank, and the carbon source dosing system adds carbon source to the stirring tank; The post-denitrification membrane separation tank has a product water pump and a backwash pump. The product water pump delivers the effluent from the post-denitrification membrane separation tank to the clear water tank. The backwash pump is connected to the clear water tank and is used to backwash the membrane separation device.

2. The wastewater treatment device according to claim 1, characterized in that, The post-denitrification membrane separation tank is equipped with a level gauge.

3. The wastewater treatment device according to claim 1, characterized in that, The anaerobic tank is equipped with an inlet pipe, and the clear water tank is equipped with an outlet.

4. A wastewater treatment device according to claim 1, characterized in that, A first overflow outlet is provided between the anaerobic tank and the primary contact oxidation tank, and the anaerobic tank and the primary contact oxidation tank are connected through the first overflow outlet.

5. A wastewater treatment device according to claim 1, characterized in that, The first-stage contact oxidation tank and the second-stage contact oxidation tank are provided with a first flow port at the bottom, and the first-stage contact oxidation tank and the second-stage contact oxidation tank are connected through the first flow port.

6. A wastewater treatment device according to claim 1, characterized in that, A second overflow port is provided between the secondary contact oxidation tank and the stirring tank, and the secondary contact oxidation tank and the stirring tank are connected through the second overflow port.

7. A wastewater treatment device according to claim 1, characterized in that, The bottom of the stirring tank and the post-denitrification membrane separation tank are provided with a second flow port, and the stirring tank and the post-denitrification membrane separation tank are connected through the second flow port.

8. A wastewater treatment device according to claim 1, characterized in that, The aeration assembly includes an aeration disc and an aeration fan, which are connected together.

9. A wastewater treatment device according to claim 7, characterized in that, Two submersible jet mixers are provided, and the two submersible jet mixers are respectively located at the bottom left and right ends of the post-denitrification membrane separation tank; The second flow outlet is located below the submersible thruster.

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