Rectangular rear-mounted sludge internal carbon source denitrification sewage denitrification treatment device

Abstract

The utility model belongs to the technical field of sewage treatment, and particularly relates to a rectangular rear sludge internal carbon source denitrification sewage denitrification treatment device which comprises an anaerobic tank, a sludge tank and two aerobic tanks which are arranged on the outer side, and an anoxic tank and an anaerobic tank which are arranged on the inner side, one aerobic tank, the sludge tank and the other aerobic tank are sequentially arranged to form a rectangular outer ring; the anoxic tank is positioned in the rectangular outer ring; the anaerobic tank, the aerobic tank and the anoxic tank are sequentially communicated, an anaerobic water inlet pipe is arranged on the anaerobic tank, a sludge-water separation area is arranged in the anaerobic tank, the top of the sludge-water separation area is communicated with the aerobic tank so that sewage enters the aerobic tank, and a water outlet pipe and a sludge discharge pipe connected with the sludge tank are connected to the anoxic tank; and the rectangular post-positioned sludge internal carbon source denitrification sewage denitrification treatment device comprises a sludge flow distribution pipe for conveying sludge at the bottom of the sludge-water separation area into the anoxic tank.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of sewage treatment, and particularly relates to a rectangular post-positioned sludge internal carbon source denitrification sewage nitrogen removal treatment device. BACKGROUND

[0002] At present, the nitrification-denitrification nitrogen removal process is generally used for sewage treatment, autotrophic microorganisms in the nitrification stage can use inorganic substances as a source of nutrition and convert them into organic substances of themselves, and heterotrophic microorganisms in the denitrification stage need to rely on organic carbon sources as energy and nutrition.

[0003] Most domestic domestic sewage treatment plants adopt the A / A / O process (i.e. anaerobic-anoxic-aerobic process) to treat sewage. The sewage flows through an anaerobic tank, an anoxic tank and an aerobic tank in turn. Under anaerobic conditions, glycogen bacteria and phosphorus bacteria in sludge adsorb and store organic carbon sources in sewage; under anoxic conditions, denitrifying phosphorus bacteria use the stored organic carbon sources in sludge for denitrification, so that nitrate and nitrite in sewage are converted into nitrogen, and the nitrogen in sewage is removed. Under aerobic conditions, nitrifying bacteria nitrify ammonia nitrogen in sewage, so that nitric acid in sewage is converted into nitrate and nitrite, and phosphorus bacteria adsorb phosphorus, so that phosphorus in sewage is removed. In order to avoid directly discharging non-compliant sewage in the aerobic tank and to provide nitrate and nitrite for the anoxic tank, the nitrified liquid in the aerobic tank needs to be refluxed into the anoxic tank, and the reflux ratio is usually large.

[0004] The existing technology has the problem that organic matter in raw water is oxidized and decomposed in the aerobic stage, and when refluxed into the anoxic tank for denitrification, an external carbon source is needed to meet the needs of heterotrophic microorganisms, resulting in a large amount of reagent consumption during operation, which puts financial pressure on the operation and maintenance of the sewage plant. On the other hand, a large reflux ratio of nitrified liquid will result in lower carbon and nitrogen in the anoxic tank, resulting in lower denitrification efficiency, increasing the amount of carbon source input, and the increase of the reflux ratio of nitrified liquid also increases the power consumption during operation. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of rectangular post-positioned sludge internal carbon source denitrification sewage nitrogen removal treatment device to solve the technical problem that the operation cost is higher in the sewage treatment process in prior art due to the need of external carbon source.

[0006] To solve the above problems, the rectangular post-positioned sludge internal carbon source denitrification sewage nitrogen removal treatment device provided by the utility model adopts the following technical scheme: a rectangular post-positioned sludge internal carbon source denitrification sewage nitrogen removal treatment device, including outside anaerobic tank, sludge tank, two aerobic tanks and inside anoxic tank, anaerobic tank, one of aerobic tank, sludge tank and another aerobic tank are arranged in sequence to form rectangular outer ring, and the anoxic tank is located in the rectangular outer ring.

[0007] The anaerobic tank, the aerobic tank and the anoxic tank are sequentially communicated, the anaerobic tank is provided with an anaerobic water inlet pipe, and the anaerobic tank has a sludge-water separation zone, the top of the sludge-water separation zone is communicated with the aerobic tank so that the sewage enters the aerobic tank, and the anoxic tank is connected with a water outlet pipe and a sludge discharge pipe connected with the sludge tank.

[0008] The rectangular post-positioned sludge internal carbon source denitrification sewage treatment device includes a sludge distribution pipe for conveying sludge at the bottom of the sludge-water separation zone to the anoxic tank.

[0009] Beneficial effects: The positions of the aerobic tank and the anoxic tank are exchanged, the sewage first enters the aerobic tank and then enters the anoxic tank, the sludge-water separation zone of the anaerobic tank separates the sewage and the sludge, the sludge with internal carbon source directly enters the anoxic tank, the organic carbon source of the sludge is fully utilized in the anoxic tank to denitrify and remove nitrogen from the nitrated liquid, so that high-efficiency denitrification can be achieved without external carbon source. The sewage discharged from the anaerobic tank contains less organic carbon source, and even if the organic carbon source is consumed, it will not affect the denitrification in the anoxic tank. On the one hand, there is more organic carbon source in the anoxic tank for denitrification, and no external carbon source is needed, thereby saving operation and maintenance costs; on the other hand, the nitrated liquid does not need to be backflowed, thereby reducing the operation and maintenance costs.

[0010] As a further improvement, the rectangular post-positioned sludge internal carbon source denitrification sewage treatment device includes a device foundation, a rectangular outer wall arranged on the device foundation, and a partition wall arranged in the rectangular outer wall, the partition wall separates the internal space of the rectangular outer wall into the anaerobic tank, the sludge tank, the aerobic tank and the anoxic tank.

[0011] As a further improvement, the rectangular post-positioned sludge internal carbon source denitrification sewage treatment device includes a side spiral staircase arranged on the rectangular outer wall and a top walkway arranged on the top of the rectangular outer wall.

[0012] As a further improvement, a plurality of baffle walls arranged in an up-down staggered manner are arranged in the anaerobic tank to make the sewage flow back in the anaerobic tank. The sewage and sludge flow back in the anaerobic tank, prolonging the anaerobic reaction time, making the glycogen bacteria and phosphorus bacteria fully adsorb and store the organic carbon source in the sewage, maximizing the adsorption, transfer and storage of the organic carbon source in the sewage, greatly reducing the organic matter concentration of the sewage, causing the sewage to mainly undergo nitrification and carbonization in the aerobic tank, making the nitrifying bacteria the dominant bacteria, creating good nitrification conditions, and improving the nitrification effect and efficiency. At the same time, due to the low organic matter concentration in the sewage, the reaction time and oxygen consumption are greatly reduced during carbonization in the aerobic tank, thereby achieving energy saving and consumption reduction.

[0013] As a further improvement, the aerobic tank is provided with an integrated biological membrane aeration device, which comprises a support arranged in the aerobic tank, biological fillers for the attachment of nitrifying bacteria and a micro-porous aerator arranged on the support.

[0014] As a further improvement, the integrated biological membrane aeration device is arranged with at least two in sequence.

[0015] As a further improvement, the anoxic tank is provided with a clarifying separator, a sewage distribution pipe and an anoxic tank aerator, the clarifying separator is used for the separation of sludge and water, the clarifying separator is provided with a side inlet for the mixed liquid to enter and a bottom outlet for the sinking sludge to return to the anoxic tank, the top of the clarifying separator is provided with a water collecting tank connected with the effluent pipe, and the water collecting tank is used for collecting clean water.

[0016] The sewage distribution pipe is horizontally arranged and one end thereof is connected with the sludge distribution pipe, and the other end is communicated with an anoxic water inlet pipe communicated with the aerobic tank, so that the sludge transported by the anaerobic tank and the nitrification liquid transported by the aerobic tank are mixed in the sewage distribution pipe, and the bottom of the sewage distribution pipe is further provided with a nozzle for spraying the mixed liquid to the two sides of the clarifying separator.

[0017] The anoxic tank aerator is arranged on the two sides of the clarifying separator, and the anoxic tank aerator is a medium-pore aerator or a large-pore aerator, and the anoxic tank aerator sprays air upward. By arranging the clarifying separator, the sewage distribution pipe and the anoxic tank aerator in the anoxic tank, the functions of mixing, stirring, reaction, sedimentation and sludge self-returning in the anoxic tank are realized. The time of denitrification in the anoxic tank is prolonged, and the full denitrification of the organic carbon source in the sludge is realized.

[0018] As a further improvement, the anoxic tank is further provided with a baffle located below the bottom outlet, the baffle is used for blocking the upward movement of the mixed liquid, and the baffle and the clarifying separator form a return gap for the sludge to return to the anoxic tank.

[0019] As a further improvement, the anaerobic tank is provided with a first sludge gas lifting device or an internal carbon source sludge pump, the first sludge gas lifting device comprises a first sludge suction pipe extending upward and downward, the bottom of the first sludge suction pipe is located at the bottom of the sludge-water separation zone, the first sludge gas lifting device further comprises a first gas supply pipe for supplying gas to the bottom of the first sludge suction pipe, and the top of the first sludge suction pipe is connected with the sludge distribution pipe.

[0020] The internal carbon source sludge pump is connected with the sludge distribution pipe to transport the sludge in the sludge-water separation zone to the anoxic tank.

[0021] As a further improvement, a second sludge gas-lifting device or a sludge backflow pump is arranged in the sludge pool, the second sludge gas-lifting device comprises a second sludge suction pipe extending upward and downward, the bottom of the second sludge suction pipe is located at the bottom of the sludge pool, the second sludge gas-lifting device further comprises a second gas supply pipe for supplying gas to the bottom of the second sludge suction pipe, and the top of the second sludge suction pipe is connected with an anaerobic sludge inlet pipe, the anaerobic sludge inlet pipe is located at the same side of the anaerobic water inlet pipe in the anaerobic pool.

[0022] The anaerobic sludge inlet pipe is connected with the sludge backflow pump to transport the sludge in the sludge pool to the side of the water inlet of the anaerobic pool. By using the anaerobic sludge inlet pipe, the glycogen bacteria and phosphorus bacteria sludge in the sludge pool in the starved endogenous reaction state are backflowed to the front end of the anaerobic pool, mixed and contacted with untreated sewage, adsorb and store the organic carbon source in the sewage, and then backflow to the anoxic pool as a denitrification carbon source, so that the carbon source in the sewage is efficiently and fully utilized, and the operation cost is saved. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description read in conjunction with the accompanying drawings, in which several embodiments of the present application are shown by way of example, and wherein the same reference numerals refer to the same or similar components throughout the several views. In the drawings:

[0024] Figure 1 A flow chart of the rectangular post-sludge internal carbon source denitrification sewage treatment device;

[0025] Figure 2 A structure schematic view of the rectangular post-sludge internal carbon source denitrification sewage treatment device from a top view angle;

[0026] Figure 3 A planar layout view of a pool body in the rectangular post-sludge internal carbon source denitrification sewage treatment device;

[0027] Figure 4 A layout view of the top of the rectangular post-sludge internal carbon source denitrification sewage treatment device;

[0028] Figure 5 A planar layout view of a pool body in the rectangular post-sludge internal carbon source denitrification sewage treatment device in other embodiments.

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 1. Anaerobic tank; 2. Sludge tank; 3. Aerobic tank; 4. Anoxic tank; 5. Foundation; 6. Rectangular outer wall; 7. Partition wall; 8. Side spiral staircase; 9. Top walkway; 10. Baffle wall; 11. First chamber; 12. Middle chamber; 13. Last chamber; 14. Anaerobic inlet pipe; 15. Water distribution trough; 16. First sludge suction pipe; 17. Anaerobic tank air supply pipe; 18. Sludge distribution pipe; 19. Integrated biofilm aeration device; 20. Support frame; 21. Biological packing material; 22. 23. Microporous aerator; 24. Anoxic inlet pipe; 25. Anoxic tank aerator; 26. Anoxic tank air supply pipe; 27. Sewage distribution pipe; 28. Sludge collection pipe; 29. ​​Outlet pipe; 30. Separation cylinder; 31. Baffle plate; 32. Sludge discharge pipe; 33. Second sludge suction pipe; 34. Sludge tank air supply pipe; 35. Sludge tank inlet pipe; 36. Anaerobic sludge inlet pipe; 37. Sludge pump; 38. Sludge discharge pipe; 39. Air supply fan; 40. Aerobic tank air supply pipe. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0032] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0033] An embodiment of the rectangular post-sludge internal carbon source denitrification wastewater denitrification treatment device provided by this utility model:

[0034] like Figures 1 to 4 As shown, the rectangular post-sludge internal carbon source denitrification wastewater denitrification treatment device (hereinafter referred to as the treatment device) includes an outer anaerobic tank 1, a sludge tank 2, two aerobic tanks 3, and an inner anoxic tank 4. The anaerobic tank 1, sludge tank 2, and two aerobic tanks 3 form a rectangular outer ring, and the anoxic tank 4 is located in the rectangular outer ring.

[0035] Specifically, the treatment device includes a foundation 5, a rectangular outer wall 6, and a partition wall 7. The rectangular outer wall 6 and partition wall 7 are both constructed from prefabricated stainless steel corrugated plates. The foundation 5 is a concrete foundation with embedded parts. The plates are welded or bolted to the embedded parts, and a secondary pouring and sealing process is performed at the joints. Finally, an anti-seepage sealant is used for waterproofing. The stainless steel corrugated plates are made of 304 or 316 stainless steel. The stainless steel corrugated plates are sealed with structural sealant and connected with high-strength bolts.

[0036] The inner space of the rectangular outer wall 6 is divided into the anaerobic tank 1, the sludge tank 2 and the two aerobic tanks 3 by the partition wall 7, wherein the anaerobic tank 1 and the sludge tank 2 are oppositely arranged, the two aerobic tanks 3 are oppositely arranged, the anaerobic tank 1, one of the aerobic tanks 3, the sludge tank 2 and the other aerobic tank 3 are sequentially arranged and form a rectangular outer ring, and the anoxic tank 4 is in the rectangular outer ring. The outer side of the rectangular outer wall 6 is fixed with the side spiral staircase 8, the top of the rectangular outer ring is provided with the top walkway 9, and the top walkway 9 is provided with a handrail.

[0037] The anaerobic tank 1, the aerobic tank 3 and the anoxic tank 4 are sequentially communicated, the sewage sequentially passes through the anaerobic tank 1, the aerobic tank 3 and the anoxic tank 4, the treated clear water in the anoxic tank 4 is directly discharged, and the sludge flows into the sludge tank 2.

[0038] The anaerobic tank 1 is provided with a plurality of baffle walls 10, the plurality of baffle walls 10 are arranged in a staggered manner in the up-down direction, so that the sewage flows back in the anaerobic tank 1, and the plurality of baffle walls 10 in the anaerobic tank 1 divide the anaerobic tank 1 into a first end chamber 11, at least one intermediate chamber 12 and a last end chamber 13, wherein the volume of the last end chamber 13 is greater than that of the first end chamber 11 and the intermediate chamber 12, the flow rate of the sewage in the last end chamber 13 is smaller, the sludge and water can be separated, and the inside of the last end chamber 13 forms a sludge-water separation zone.

[0039] The rectangular outer wall 6 is provided with an anaerobic water inlet pipe 14 communicated with the anaerobic tank 1, and the anaerobic water inlet pipe 14 introduces the sewage into the anaerobic tank 1.

[0040] The top of the partition wall 7 is provided with a water distribution groove 15 communicated with the top of the sludge-water separation zone and the aerobic tank 3, and the water distribution groove 15 introduces the sewage at the top of the sludge-water separation zone into the aerobic tank 3.

[0041] The anaerobic tank 1 is provided with a first sludge gas lifting device, the first sludge gas lifting device comprises a first sludge suction pipe 16 and an anaerobic tank gas supply pipe 17, the first sludge suction pipe 16 extends upwardly, the bottom of the first sludge suction pipe 16 is located at the bottom of the sludge-water separation zone, the anaerobic tank gas supply pipe 17 supplies gas to the bottom of the first sludge suction pipe 16, gas bubbles are generated in the first sludge suction pipe 16 during the rising of the gas, and the sludge is driven to flow upwardly. The first sludge suction pipe 16 is connected with a sludge flow distribution pipe 18, one end of the sludge flow distribution pipe 18 is connected to the anoxic tank 4, and the sludge at the bottom of the sludge-water separation zone is transported to the anoxic tank 4. In other embodiments, the sludge flow distribution pipe can be extended to the bottom of the sludge-water separation zone, and an internal carbon source sludge pump is installed on the sludge flow distribution pipe to transport the sludge at the bottom of the sludge-water separation zone to the anoxic tank.

[0042] An integrated biofilm aeration device 19 is installed in the aerobic tank 3. The integrated biofilm aeration device 19 includes a support frame 20, biological packing material 21, a microporous aerator 22, and an aerobic tank air supply pipe 40. The biological packing material 21 is fixedly installed on the support frame 20 and provides attachment points for nitrifying bacteria. The microporous aerator 22 is fixedly installed on the support frame 20. The aerobic tank air supply pipe 40 is connected to the microporous aerator 22 and includes a horizontal pipe and a vertical pipe. The horizontal pipe is connected to the microporous aerator 22, and the vertical pipe extends upwards. During use, the microporous aerator 22 primarily supplies oxygen, with agitation as a secondary function.

[0043] The integrated biofilm aeration device 19 can be lifted and lowered as a whole, facilitating its installation and subsequent maintenance. In actual use, the number of integrated biofilm aeration devices can be increased as needed.

[0044] An anoxic water inlet pipe 23 is also installed on the partition wall 7. The anoxic water inlet pipe 23 is located in the lower part of the aerobic tank 3, guiding the nitrified liquid after nitrification reaction in the aerobic tank 3 into the anoxic tank 4.

[0045] The anoxic tank 4 is equipped with a clarifier, an anoxic tank aerator 24, an anoxic tank air supply pipe 25, a wastewater distribution pipe 26, a sludge collection pipe 27, and an effluent pipe 28. The clarifier is located in the center of the anoxic tank 4 and is fixed by suspension or bottom support. The clarifier includes a separation cylinder 29, a guide plate 30, and a baffle 31. The bottom of the separation cylinder 29 is conical, and a side inlet is opened on the side of the separation cylinder 29. The lower end of the guide plate 30 is located below the side inlet and extends upward from the separation cylinder, guiding the mixed liquid in the anoxic tank 4 into the separation cylinder 29. A bottom outlet is opened at the bottom of the separation cylinder 29. After the mixed liquid enters the separation cylinder 29, sludge-water separation occurs, and the settled sludge flows back into the anoxic tank 4 through the bottom outlet.

[0046] Baffle 31 is located below the bottom outlet, blocking it and preventing the mixed liquid from flowing directly upwards into the separation cylinder 29. A return slit is formed between baffle 31 and the separation cylinder 29, allowing sludge to return to the anoxic tank 4. The cross-section of baffle 31 is triangular, with its apex extending into the bottom outlet.

[0047] A water collection tank is fixed to the top of the separation cylinder 29. The water collection tank can collect the clean water at the top of the separation cylinder 29. The water outlet pipe 28 is connected to the water collection tank and extends to the outside of the rectangular outer wall 6 to draw out the clean water.

[0048] The anoxic tank aerator 24 is fixed at the bottom of the anoxic tank 4 and is located on both sides of the clarifier. The anoxic tank aerator 24 here is either a medium-pore aerator or a large-pore aerator. The anoxic tank aerator 24 blows gas upward, and the rising bubbles drive the mixed liquid to flow upward.

[0049] The sewage distribution pipe 26 is placed horizontally in the anoxic tank 4. One end of the sewage distribution pipe 26 is connected to the sludge distribution pipe 18, and the other end is connected to the anoxic inlet pipe 23. The bottom of the sewage distribution pipe 26 has nozzles on both sides facing the clarifier. After the sludge and sewage are mixed, they are sprayed out from the nozzles. With the air lift effect of the aerator 24 in the anoxic tank, the mixed liquid flows upward.

[0050] The sludge collection pipe 27 is located below the sewage distribution pipe 26 and is used to collect sludge from the anoxic tank 4. The sludge collection pipe 27 is connected to the sludge discharge pipe 32, which is connected to the sludge tank 2.

[0051] A second sludge airlift device is installed inside the sludge tank 2. This device includes a second suction pipe 33 and a sludge tank air supply pipe 34. The second suction pipe 33 extends vertically, with its bottom located at the bottom of the sludge tank 2. The sludge tank air supply pipe 34 supplies air to the bottom of the second suction pipe 33. During the upward movement of the air, bubbles are generated in the second suction pipe 33, causing the sludge to flow upwards. The second suction pipe 33 is connected to a sludge tank inlet pipe 35 and an anaerobic sludge inlet pipe 36. The sludge tank inlet pipe 35 leads to the sludge tank 2, and the anaerobic sludge inlet pipe 36 leads to the anaerobic tank 1, with the anaerobic sludge inlet pipe 36 located on the water-inlet side of the anaerobic tank 1. In other embodiments, the anaerobic sludge inlet pipe extends to the bottom of the sludge tank, and a sludge return pump is installed on the anaerobic sludge pipe to transport the sludge from the sludge tank to the anaerobic tank.

[0052] A sludge pump 37 is placed in the sludge tank 2, and a sludge discharge pipe 38 is installed on the sludge pump 37. The sludge pump 37 and the sludge discharge pipe 38 discharge the sludge in the sludge tank 2.

[0053] The treatment device also includes an air supply fan 39, which is connected to the anaerobic tank air supply pipe 17, the aerobic tank air supply pipe 40, the anoxic tank air supply pipe 25, and the sludge tank air supply pipe 34.

[0054] The treatment device also includes a monitoring section, which includes an online acid-base monitor, an online oxidation-reduction potential monitor, and an online sludge concentration monitor for monitoring anaerobic tank 1; an online acid-base monitor, an online sludge concentration monitor, and an online dissolved oxygen monitor for monitoring aerobic tank 3; and an online dissolved oxygen monitor and an online sludge concentration monitor for monitoring anoxic tank 4.

[0055] Operating Procedure: Wastewater enters anaerobic tank 1 through anaerobic inlet pipe 14, along with sludge introduced through anaerobic sludge inlet pipe 36. The wastewater and sludge flow back and forth and mix within anaerobic tank 1. Polysaccharitrophs and polyphosphate-accumulating bacteria in the sludge absorb and store the organic carbon source in the wastewater under anaerobic conditions and with a high organic carbon source, while polyphosphate-accumulating bacteria fully release phosphorus. The mixture of wastewater and sludge is separated in the sludge-water separation zone. The wastewater at the top enters aerobic tank 3 through distribution trough 15, while the sludge at the bottom is treated by the first sludge airlift device and then transported to anoxic tank 4 through sludge distribution pipe 18.

[0056] After the wastewater enters the aerobic tank 3, an integrated biofilm aeration device 19 installed within the aerobic tank 3 creates a symbiotic environment of biological sludge and film. Nitrifying bacteria attach to the biological packing material 21, while polyphosphate-accumulating bacteria (PACs) are suspended in the aerobic tank and settle after absorbing phosphorus. The nitrifying bacteria growing on the biological packing material 21 treat the ammonia nitrogen in the wastewater, converting it into nitrates and nitrites. Simultaneously, PACs absorb excess phosphorus under aerobic conditions. The nitrified liquid formed after the aerobic reaction enters the anoxic tank 4 through the anoxic inlet pipe 23.

[0057] The sludge in the sludge distribution pipe 18 and the nitrified liquid in the anoxic inlet pipe 23 both enter the wastewater distribution pipe 26 for mixing and are sprayed out from the nozzle. The sprayed mixture continues to mix with the sludge returned from the clarifier. Under anoxic conditions, denitrifying and phosphorus-removing bacteria utilize the organic carbon source in the sludge for denitrification, converting nitrates and nitrites in the wastewater into nitrogen gas and further absorbing phosphorus, nitrifying the organic carbon source stored in the sludge, and simultaneously achieving wastewater denitrification, phosphorus removal, and sludge regeneration. The mixture after the anoxic reaction flows into the separation cylinder 29 of the clarifier for sludge-water separation. The upper layer of clear water is discharged through the collection tank and outlet pipe 28, while the lower layer of sludge is returned to the anoxic tank 4. Part of it mixes with the mixture sprayed from the wastewater distribution pipe 26 and undergoes anoxic reaction, while the other part enters the sludge collection pipe 27 and is transported to the sludge tank 2.

[0058] After being processed by the second sludge air-lift device, part of the sludge in sludge tank 2 is returned to sludge tank 2, and part enters the anaerobic sludge inlet pipe 36 and then enters anaerobic tank 1. The sludge in the sludge tank is in a state of starved endogenous reaction, and entering anaerobic tank 1 enhances the adsorption and storage of organic carbon sources in the wastewater.

[0059] In this embodiment, the use of stainless steel corrugated plates during assembly allows for factory prefabrication and on-site splicing, effectively reducing on-site construction time, installation difficulty, and manpower requirements. It also ensures quality and simplifies subsequent equipment maintenance and repair operations.

[0060] Employing 304 or 316 high-performance stainless steel corrugated plates and bolt-fixed steel anti-corrosion assembly technology, the system possesses properties such as acid and alkali resistance, wear resistance, and aging resistance, ensuring the safe and corrosion-resistant service life of the tank structure. Anaerobic, aerobic, sludge, and anoxic tanks are assembled from rectangular stainless steel corrugated plates and rectangular reinforced concrete foundations. This structure offers excellent structural strength, is reusable, has a long service life, short construction period, high quality, and allows for rapid commissioning, effectively reducing investment costs.

[0061] In other embodiments, such as Figure 5 As shown, the rectangular outer wall 6, partition wall 7, and deflector wall 10 are all formed by concrete casting.

[0062] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A rectangular post-sludge internal carbon source denitrification sewage nitrogen removal treatment device, characterized in that, The rectangular post-positioned sludge internal carbon source denitrification sewage denitrification treatment device comprises an anaerobic tank, a sludge tank, two aerobic tanks and an anoxic tank, the anaerobic tank, one of the aerobic tanks, the sludge tank and the other aerobic tank are arranged in sequence to form a rectangular outer ring, and the anoxic tank is located in the rectangular outer ring. The anaerobic tank, the aerobic tank and the anoxic tank are sequentially communicated, the anaerobic tank is provided with an anaerobic water inlet pipe, the anaerobic tank has a sludge-water separation zone, the top of the sludge-water separation zone is communicated with the aerobic tank so that sewage enters the aerobic tank, the anoxic tank is connected with a water outlet pipe and a sludge discharge pipe connected with the sludge tank. The rectangular post-positioned sludge internal carbon source denitrification sewage denitrification treatment device comprises a sludge distribution pipe for conveying sludge at the bottom of the sludge-water separation zone to the anoxic tank.

2. The rectangular post-positioned sludge internal carbon source denitrification wastewater nitrogen removal treatment device according to claim 1, characterized in that, The rectangular post-positioned sludge internal carbon source denitrification sewage denitrification treatment device comprises a device foundation, a rectangular outer wall arranged on the device foundation, and a partition wall arranged in the rectangular outer wall, the partition wall divides the internal space of the rectangular outer wall into the anaerobic tank, the sludge tank, the aerobic tank and the anoxic tank.

3. The rectangular post-positioned sludge internal carbon source denitrification wastewater nitrogen removal treatment device according to claim 2, characterized in that, The rectangular post-positioned sludge internal carbon source denitrification sewage denitrification treatment device comprises a side spiral staircase arranged on the rectangular outer ring and a top walkway arranged on the top of the rectangular outer ring.

4. The rectangular post-positioned sludge internal carbon source denitrification wastewater nitrogen removal treatment device according to claim 2, characterized in that, The anaerobic tank is provided with a plurality of baffle walls arranged in an up-down staggered manner to enable the sewage to flow back in the anaerobic tank.

5. The rectangular post-positioned sludge internal carbon source denitrification wastewater nitrogen removal treatment device according to any one of claims 1-4, characterized in that, The aerobic tank is provided with an integrated bio-membrane aeration device, the integrated bio-membrane aeration device comprises a support arranged in the aerobic tank, the support is provided with biological fillers for the adhesion of nitrifying bacteria and a micro-porous aerator.

6. The rectangular post-positioned sludge internal carbon source denitrification wastewater nitrogen removal treatment device according to claim 5, characterized in that, The integrated bio-membrane aeration device is sequentially arranged with at least two.

7. The rectangular post-positioned sludge internal carbon source denitrification device for wastewater nitrogen removal treatment according to any one of claims 1-4, characterized in that, The anoxic tank is provided with a clarifying separator, a sewage distribution pipe and an anoxic tank aerator, the clarifying separator is used for sludge-water separation, the clarifying separator is provided with a side inlet for the entry of mixed liquid and a bottom outlet for the return of sinking sludge to the anoxic tank, the top of the clarifying separator is provided with a water collecting tank connected with the water outlet pipe, and the water collecting tank is used for collecting clear water; The sewage distribution pipe is horizontally arranged and connected with the sludge distribution pipe at one end and connected with an anoxic water inlet pipe communicated with the aerobic tank at the other end, so that the sludge conveyed by the anaerobic tank and the nitrification liquid conveyed by the aerobic tank are mixed in the sewage distribution pipe, and the bottom of the sewage distribution pipe is further provided with a jet nozzle for spraying the mixed liquid to the two sides of the clarifying separator; The anoxic tank aerator is arranged on the two sides of the clarifying separator, the anoxic tank aerator is a medium-pore aerator or a large-pore aerator, and the anoxic tank aerator sprays air upward.

8. The rectangular post-positioned sludge internal carbon source denitrification wastewater nitrogen removal treatment device according to claim 7, characterized in that, The anoxic tank is further provided with a baffle below the bottom outlet, the baffle is used for blocking the upward movement of the mixed liquid, and the baffle and the clarifying separator form a return gap for the return of sludge to the anoxic tank.

9. The rectangular post-positioned sludge internal carbon source denitrification device for wastewater nitrogen removal treatment according to any one of claims 1-4, characterized in that, The anaerobic tank is provided with a first sludge gas lifting device or an internal carbon source sludge pump, the first sludge gas lifting device comprises a first sludge suction pipe extending upward and downward, the bottom of the first sludge suction pipe is located at the bottom of the sludge-water separation zone, the first sludge gas lifting device further comprises a first gas supply pipe for supplying gas to the bottom of the first sludge suction pipe, and the top of the first sludge suction pipe is connected with the sludge distribution pipe; The internal carbon source sludge pump is connected with the sludge distribution pipe to convey the sludge in the sludge-water separation zone to the anoxic tank.

10. The rectangular post-positioned sludge internal carbon source denitrification wastewater nitrogen removal treatment device according to any one of claims 1-4, characterized in that, The sludge pool is provided with a second sludge gas lifting device or a sludge backflow pump, the second sludge gas lifting device comprises a second sludge suction pipe extending upward and downward, the bottom of the second sludge suction pipe is located at the bottom of the sludge pool, the second sludge gas lifting device further comprises a second gas supply pipe for supplying gas to the bottom of the second sludge suction pipe, and the top of the second sludge suction pipe is connected with an anaerobic sludge inlet pipe, the anaerobic sludge inlet pipe and the anaerobic water inlet pipe are located on the same side of the anaerobic pool. The anaerobic sludge inlet pipe is connected to the sludge backflow pump, so that the sludge in the sludge pool can be transported to the side of the anaerobic pool where water is introduced.

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