PVP (Polyvinyl Pyrrolidone) production wastewater treatment device and wastewater treatment equipment

Abstract

The utility model provides a PVP (Polyvinyl Pyrrolidone) production wastewater treatment device and wastewater treatment equipment. A pre-anoxic tank, an anaerobic tank, an anoxic tank and an aerobic tank of the PVP production wastewater treatment device are sequentially communicated, a baffle is arranged in a fluid chamber of the pre-anoxic tank and divides the fluid chamber into a first reflux chamber and a second reflux chamber, a first reflux stirrer is arranged in the first reflux chamber, and a second reflux stirrer is arranged in the second reflux chamber. A rotary backflow blade of the first backflow stirrer is arranged towards the direction of the water outlet, the second backflow stirrer is arranged in the second backflow chamber, and a rotary backflow blade of the second backflow stirrer is arranged towards the direction of the water inlet, so that water flow circularly flows in the first backflow chamber and the second backflow chamber in the direction from the water inlet to the water outlet; the water flow sequentially passes through the first phosphorus-accumulating denitrifying bacterium filler piece arranged in the first backflow chamber and the second phosphorus-accumulating denitrifying bacterium filler piece arranged in the second backflow chamber. According to the PVP production wastewater treatment device, the nitrogen and phosphorus removal effect of the device is enhanced by improving the pre-anoxic tank.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wastewater treatment, and in particular to a PVP production wastewater treatment device and wastewater treatment equipment. Background Art

[0002] PVP (polyvinylpyrrolidone) is widely used in medicine, cosmetics, food and other fields. During the production and use of PVP, a large amount of wastewater is generated. The wastewater usually contains a large amount of organic matter, nitrogen, phosphorus and other pollutants. If it is discharged directly without effective treatment, it will cause serious pollution to the environment.

[0003] Therefore, for example, Chinese patent number CN 205204987 U discloses a polyvinylpyrrolidone production wastewater treatment system, comprising a pH adjustment tank, an intermediate water tank, a lift pump, a multi-component catalytic oxidation device, and a biochemical tank connected in sequence. The biochemical tank comprises an anoxic tank, an aerobic tank, a nitrification liquid return pump, biological fillers, microporous aeration pipes, and a sedimentation tank. The anoxic tank is connected to the aerobic tank, which is connected to the sedimentation tank. The anoxic tank and the aerobic tank are each equipped with biological fillers. A microporous aeration pipe is provided at the bottom of the aerobic tank. The aerobic tank and the anoxic tank are also connected via a nitrification liquid return pump.

[0004] However, the above-mentioned polyvinyl pyrrolidone production wastewater treatment system can effectively treat polyvinyl pyrrolidone production wastewater, but has deficiencies in phosphorus and nitrogen removal effects. Utility Model Content

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a PVP production wastewater treatment device and wastewater treatment equipment that enhance the denitrification and phosphorus removal effects.

[0006] The purpose of this disclosure is achieved through the following technical solutions:

[0007] A PVP production wastewater treatment device comprises a pre-anoxic tank, an anaerobic tank, an anoxic tank and an aerobic tank, wherein the pre-anoxic tank, the anaerobic tank, the anoxic tank and the aerobic tank are connected in sequence, the pre-anoxic tank is provided with a fluid chamber, the pre-anoxic tank comprises a water inlet, a water outlet, a baffle, a first reflux mixer and a second reflux mixer; the baffle is arranged in the fluid chamber, the baffle divides the fluid chamber into a first reflux chamber and a second reflux chamber, the first reflux mixer is arranged in the first reflux chamber, the rotating reflux blades of the first reflux mixer are arranged toward the water outlet, the second reflux mixer is arranged in the second reflux chamber, the rotating reflux blades of the second reflux mixer are arranged toward the water inlet, so that water circulates in the first reflux chamber and the second reflux chamber in a direction from the water inlet to the water outlet; and,

[0008] The pre-anoxic tank also includes a first polyphosphate denitrifying bacteria filler and a second polyphosphate denitrifying bacteria filler. The first polyphosphate denitrifying bacteria filler is arranged in the first reflow chamber, and the second polyphosphate denitrifying bacteria filler is arranged in the second reflow chamber, so that water flows through the first polyphosphate denitrifying bacteria filler and the second polyphosphate denitrifying bacteria filler in sequence.

[0009] In one embodiment, the PVP production wastewater treatment device further includes a hydrolysis and acidification tank, the hydrolysis and acidification tank is connected to the water inlet, and the water outlet is connected to the anaerobic tank.

[0010] In one embodiment, there are at least two first polyphosphate denitrifying bacteria fillers.

[0011] In one embodiment, there are at least two second polyphosphate denitrifying bacteria fillers.

[0012] In one embodiment, the first polyphosphate denitrifying bacteria filler includes a first support frame and a first biofilm filler. The first support frame is provided at the bottom of the first reflux chamber, and the first biofilm filler is fully provided on the first support frame.

[0013] In one embodiment, the second polyphosphate denitrifying bacteria filler includes a second support frame and a second biofilm filler. The second support frame is provided at the bottom of the second reflux chamber, and the second biofilm filler is fully provided on the second support frame.

[0014] In one embodiment, the first biofilm-forming filler is a polyethylene biofilm-forming filler or a polypropylene biofilm-forming filler.

[0015] In one embodiment, the second biofilm-forming filler is a polyethylene biofilm-forming filler or a polypropylene biofilm-forming filler.

[0016] In one embodiment, the first reflux mixer is a first submersible flow propeller.

[0017] In one embodiment, the second reflux mixer is a second submersible flow propeller.

[0018] In one embodiment, the PVP production wastewater treatment device further includes a secondary sedimentation tank and a sludge return pipe. The secondary sedimentation tank is connected to the aerobic tank, and the secondary sedimentation tank is connected to the pre-anoxic tank through the sludge return pipe.

[0019] In one embodiment, the PVP production wastewater treatment device further includes a sludge treatment tank, which is connected to the secondary sedimentation tank for discharging excess sludge.

[0020] In one embodiment, the PVP production wastewater treatment device further includes a mixed liquor reflux pipeline, and the aerobic tank is connected to the reflux port of the pre-anoxic tank through the mixed liquor reflux pipeline.

[0021] A wastewater treatment device comprises the PVP production wastewater treatment device described in any one of the above embodiments.

[0022] Compared with the prior art, the present disclosure has at least the following advantages:

[0023] The PVP production wastewater treatment device disclosed in the present invention divides the fluid chamber of the pre-anoxic tank into a first reflux chamber and a second reflux chamber due to the baffle plate, so that the wastewater first enters the first reflux chamber through the water inlet, ensuring that the wastewater flows toward the water outlet under the rotation of the first reflux mixer, and then the wastewater enters the second reflux chamber, ensuring that the wastewater flows toward the water inlet under the rotation of the second reflux mixer, so that the wastewater circulates in the first reflux chamber and the second reflux chamber, increasing the contact area between the wastewater and the first polyphosphate denitrifying bacteria filler and the second polyphosphate denitrifying bacteria filler when flowing, thereby ensuring that a better attachment and growth site is provided for microorganisms. In the first reflow chamber and the second reflow chamber, the polyphosphate bacteria can release phosphorus more fully under the circulation of wastewater, preparing for the subsequent excessive absorption of phosphorus in an aerobic environment, thereby improving the phosphorus removal effect of the device; in the pre-anoxic tank, the organic matter and nitrate nitrogen carried in the circulating wastewater can fully contact with the denitrifying bacteria on the first polyphosphate denitrifying bacteria filler and the second polyphosphate denitrifying bacteria filler, promoting the denitrification reaction. The circulating water flow can evenly distribute the nitrate nitrogen in the wastewater on the first polyphosphate denitrifying bacteria filler and the second polyphosphate denitrifying bacteria filler, and use the organic matter in the wastewater as a carbon source to reduce the nitrate nitrogen to nitrogen gas, thereby improving the denitrification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 This is a structural schematic diagram of a PVP production wastewater treatment device according to an embodiment of the present disclosure;

[0026] Figure 2 for Figure 1 The schematic diagram of the top view of the pre-anoxic tank in the PVP production wastewater treatment device shown;

[0027] Figure 3This is a schematic structural diagram of the circulation of PVP wastewater in a pre-anoxic tank according to an embodiment of the present disclosure.

[0028] Figure numerals: 10, PVP production wastewater treatment device; 100, pre-anoxic tank; 101, fluid chamber; 101a, first reflux chamber; 101b, second reflux chamber; 110, water inlet; 120, water outlet; 130, baffle; 140, first reflux mixer; 150, second reflux mixer; 160, first polyphosphate denitrifying bacteria filler; 161, first supporting frame; 162, first biofilm filler; 170, second polyphosphate denitrifying bacteria filler; 171, second supporting frame; 172, second biofilm filler; 180, reflux port; 200, anaerobic tank; 300, anoxic tank; 400, aerobic tank; 500, hydrolysis acidification tank; 600, secondary sedimentation tank; 700, sludge return pipe; 800, sludge treatment tank; 900, mixed liquor return pipe. DETAILED DESCRIPTION

[0029] To facilitate understanding of the present disclosure, a more comprehensive description of the present disclosure will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present disclosure. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure pertains. The terms used herein in the specification of this disclosure are intended only to describe specific embodiments and are not intended to limit this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] In order to better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure is further described in detail below with reference to specific embodiments:

[0033] like Figures 1 to 3As shown, a PVP production wastewater treatment device 10 of an embodiment includes a pre-anoxic tank 100, an anaerobic tank 200, an anoxic tank 300 and an aerobic tank 400, wherein the pre-anoxic tank 100, the anaerobic tank 200, the anoxic tank 300 and the aerobic tank 400 are sequentially connected, and the pre-anoxic tank 100 is provided with a fluid chamber 101, the pre-anoxic tank 100 includes a water inlet 110, a water outlet 120, a baffle 130, a first reflux mixer 140 and a second reflux mixer 150; the baffle 130 is provided in the fluid chamber 101, and the baffle 130 divides the fluid chamber 101 into a first reflux chamber 101a and a second reflux chamber 101b, and the first reflux mixer 140 is provided in the first reflux chamber 101a, and the rotating reflux blades of the first reflux mixer 140 are directed toward It is arranged in the direction of the water outlet 120, the second reflux mixer 150 is arranged in the second reflux chamber 101b, and the rotating reflux blades of the second reflux mixer 150 are arranged in the direction of the water inlet 110, so that the water flows in the first reflux chamber 101a and the second reflux chamber 101b in the direction from the water inlet 110 to the water outlet 120; and the pre-anoxic tank 100 also includes a first polyphosphate denitrifying bacteria filler 160 and a second polyphosphate denitrifying bacteria filler 170, the first polyphosphate denitrifying bacteria filler 160 is arranged in the first reflux chamber 101a, and the second polyphosphate denitrifying bacteria filler 170 is arranged in the second reflux chamber 101b, so that the water flows through the first polyphosphate denitrifying bacteria filler 160 and the second polyphosphate denitrifying bacteria filler 170 in sequence.

[0034] It can be understood that since the baffle 130 divides the fluid chamber 101 of the pre-anoxic tank 100 into the first reflux chamber 101a and the second reflux chamber 101b, the wastewater first enters the first reflux chamber 101a through the water inlet 110, ensuring that the wastewater flows toward the water outlet 120 under the rotation of the first reflux mixer 140, and then the wastewater enters the second reflux chamber 101b, ensuring that the wastewater flows toward the water inlet 110 under the rotation of the second reflux mixer 150, so that the wastewater circulates in the first reflux chamber 101a and the second reflux chamber 101b, increasing the contact area between the wastewater and the first polyphosphate denitrifying bacteria filler 160 and the second polyphosphate denitrifying bacteria filler 170 when flowing, thereby ensuring that better conditions are provided for microorganisms, namely polyphosphate bacteria and denitrifying bacteria. The attachment and growth place of the polyphosphate bacteria is in the first reflow chamber 101a and the second reflow chamber 101b of the pre-anoxic tank 100. The polyphosphate bacteria can release phosphorus more fully under the circulation of the wastewater, and prepare for the subsequent excessive absorption of phosphorus in an aerobic environment, thereby improving the phosphorus removal effect of the device; in the pre-anoxic tank 100, the organic matter and nitrate nitrogen carried in the circulating wastewater can fully contact with the denitrifying bacteria on the first polyphosphate denitrifying bacteria filler 160 and the second polyphosphate denitrifying bacteria filler 170, thereby promoting the denitrification reaction. The circulating water flow can evenly distribute the nitrate nitrogen in the wastewater on the first polyphosphate denitrifying bacteria filler 160 and the second polyphosphate denitrifying bacteria filler 170, and use the organic matter in the wastewater as a carbon source to reduce the nitrate nitrogen to nitrogen gas, thereby improving the denitrification effect.

[0035] It can also be understood that the wastewater enters the anaerobic tank 200 from the pre-anoxic tank 100, and the microorganisms form a granular structure under anaerobic conditions to treat high-concentration organic wastewater. The wastewater then enters the anoxic tank 300 from the anaerobic tank 200. Under anaerobic conditions, the microorganisms remove nitrate nitrogen in the wastewater through denitrification, and at the same time remove part of the BOD (biochemical oxygen demand). Finally, the wastewater enters the aerobic tank 400, and oxygen is provided through aeration, thereby promoting the growth of microorganisms and the degradation of organic matter.

[0036] like Figure 1 and Figure 2 As shown, in one embodiment, the PVP production wastewater treatment device 10 further includes a hydrolysis and acidification tank 500, which is connected to the water inlet 110, and the water outlet 120 is connected to the anaerobic tank 200. In this embodiment, by providing the hydrolysis and acidification tank 500 in front of the pre-anoxic tank 100, the hydrolysis and acidification bacteria can convert large molecular organic matter into small molecular organic matter, thereby improving the biodegradability of the wastewater and providing a suitable substrate for the subsequent anaerobic digestion process.

[0037] It should be noted that the hydrolysis acidification tank 500, the anaerobic tank 200, the anoxic tank 300 and the aerobic tank 400 are all existing devices. This application only protects the connection relationship and position relationship of the hydrolysis acidification tank 500, the anaerobic tank 200, the anoxic tank 300 and the aerobic tank 400.

[0038] like Figure 1 and Figure 2 As shown, in one embodiment, there are at least two first polyphosphate denitrifying bacteria fillers 160 to ensure that during the circulation of wastewater, multiple first polyphosphate denitrifying bacteria fillers 160 increase the contact area with the wastewater, providing more growth space for microorganisms, thereby improving the degradation efficiency of pollutants such as organic matter, nitrogen and phosphorus in the wastewater.

[0039] like Figure 1 and Figure 2 As shown, in one embodiment, there are at least two second polyphosphate denitrifying bacteria fillers 170 to ensure that during the circulation of wastewater, multiple second polyphosphate denitrifying bacteria fillers 170 increase the contact area with the wastewater, providing more growth space for microorganisms, thereby improving the degradation efficiency of pollutants such as organic matter, nitrogen and phosphorus in the wastewater.

[0040] like Figure 2 As shown, in one embodiment, the first polyphosphate denitrifying bacteria filler 160 includes a first support frame 161 and a first biofilm filler 162. The first support frame 161 is provided at the bottom of the first reflux chamber 101a, and the first biofilm filler 162 is fully provided on the first support frame 161. In this embodiment, the first support frame 161 provides stable support for the first biofilm filler 162, preventing the first biofilm filler 162 from dispersing under the flow of wastewater, thereby causing the first biofilm filler 162 to accumulate or clog in the first reflux chamber 101a. At the same time, the first biofilm filler 162 is fully provided on the first support frame 161, ensuring that the contact area between the wastewater and the first biofilm filler 162 is increased when the wastewater flows through the first biofilm filler 162, thereby improving the phosphorus and nitrogen removal effect.

[0041] like Figure 2As shown, in one embodiment, the second polyphosphate denitrifying bacteria filler 170 includes a second support frame 171 and a second biofilm filler 172. The second support frame 171 is provided at the bottom of the second reflux chamber 101b, and the second biofilm filler 172 is fully provided on the second support frame 171. In this embodiment, the second support frame 171 provides stable support for the second biofilm filler 172, preventing the second biofilm filler 172 from dispersing under the flow of wastewater, thereby causing the second biofilm filler 172 to accumulate or clog in the second reflux chamber 101b. At the same time, the second biofilm filler 172 is fully provided on the second support frame 171, ensuring that the contact area between the wastewater and the second biofilm filler 172 is increased when the wastewater flows through the second biofilm filler 172, thereby improving the phosphorus and nitrogen removal effect.

[0042] In one embodiment, the first biofilm-forming filler 162 is polyethylene biofilm-forming filler or polypropylene biofilm-forming filler; the second biofilm-forming filler 172 is polyethylene biofilm-forming filler or polypropylene biofilm-forming filler. As will be appreciated, polyethylene biofilm-forming fillers and polypropylene biofilm-forming fillers have high strength and can withstand the impact of wastewater flow, ensuring long-term stable use. Furthermore, the specific gravity of polyethylene biofilm-forming fillers and polypropylene biofilm-forming fillers is close to that of water, making biofilm formation easier and less prone to agglomeration and clogging. In this embodiment, those skilled in the art can select appropriate first biofilm-forming fillers 162 and second biofilm-forming fillers 172 based on actual conditions.

[0043] In one embodiment, the first reflux mixer 140 is a first submersible flowmaker, which ensures that the wastewater circulates in the first reflux chamber 101a of the pre-anoxic tank 100 along a set direction.

[0044] In one embodiment, the second reflux mixer 150 is a second submersible flowmaker, which ensures that the wastewater circulates in the second reflux chamber 101b of the pre-anoxic tank 100 along a set direction.

[0045] It should be noted that the first submersible flow thruster and the second submersible flow thruster are both existing devices, and this application only protects the connection relationship and position relationship between the first submersible flow thruster and the second submersible flow thruster.

[0046] like Figure 1 and Figure 2As shown, in one embodiment, the PVP production wastewater treatment device 10 further includes a secondary sedimentation tank 600 and a sludge return pipe 700. The secondary sedimentation tank 600 is connected to the aerobic tank 400, and the secondary sedimentation tank 600 is connected to the pre-anoxic tank 100 through the sludge return pipe 700. In this embodiment, since the secondary sedimentation tank 600 is connected to the aerobic tank 400, the mixed liquor treated in the aerobic tank 400 enters the secondary sedimentation tank 600, and the activated sludge therein is precipitated at the bottom of the secondary sedimentation tank 600. Since the secondary sedimentation tank 600 is connected to the pre-anoxic tank 100 through the sludge return pipe 700, the returned activated sludge enters the pre-anoxic tank 100 and further participates in subsequent wastewater treatment, thereby improving the efficiency of wastewater treatment.

[0047] like Figure 1 and Figure 2 As shown, in one embodiment, the PVP production wastewater treatment device 10 also includes a sludge treatment tank 800, which is connected to the secondary sedimentation tank 600 and is used to discharge residual sludge to ensure that the residual sludge in the secondary sedimentation tank 600 is removed in time to prevent the residual sludge from accumulating and clogging, thereby affecting the normal operation of the entire device.

[0048] like Figure 1 and Figure 2 As shown, in one embodiment, the PVP production wastewater treatment device 10 also includes a mixed liquor return pipe 900, and the aerobic tank 400 is connected to the return port 180 of the pre-anoxic tank 100 through the mixed liquor return pipe 900. In this embodiment, since the mixed liquor returns from the aerobic tank 400 to the pre-anoxic tank 100, the mixed liquor contains some nitrate nitrogen. In the pre-anoxic tank 100, the denitrifying bacteria use the organic matter in the wastewater as a carbon source to reduce the nitrate nitrogen to nitrogen gas, thereby improving the denitrification effect; and since the mixed liquor return brings some phosphorus, the phosphorus content in the pre-anoxic tank 100 is increased, which is conducive to the full release of phosphorus by the polyphosphate bacteria. At the same time, after absorbing phosphorus, the polyphosphate bacteria in the aerobic tank 400 re-enter the pre-anoxic tank 100 through the mixed liquor return, realizing the cyclic removal of phosphorus, thereby improving the phosphorus removal effect.

[0049] The present disclosure also provides a wastewater treatment device, comprising the PVP production wastewater treatment device 10 described in any of the above embodiments.

[0050] Compared with the prior art, the present disclosure has at least the following advantages:

[0051] The PVP production wastewater treatment device 10 disclosed in the present invention divides the fluid chamber 101 of the pre-anoxic tank 100 into a first reflux chamber 101a and a second reflux chamber 101b due to the baffle 130, so that the wastewater first enters the first reflux chamber 101a through the water inlet 110, ensuring that the wastewater flows toward the water outlet 120 under the rotation of the first reflux mixer 140, and then the wastewater enters the second reflux chamber 101b, ensuring that the wastewater flows toward the water inlet 110 under the rotation of the second reflux mixer 150, so that the wastewater circulates in the first reflux chamber 101a and the second reflux chamber 101b, increasing the contact area between the wastewater and the first polyphosphate denitrifying bacteria filler 160 and the second polyphosphate denitrifying bacteria filler 170 when flowing, thereby ensuring that more water is provided for the microorganisms. The pre-anoxic tank 100 has an optimal attachment and growth site. In the first reflow chamber 101a and the second reflow chamber 101b of the pre-anoxic tank 100, the polyphosphate bacteria can release phosphorus more fully under the circulation of the wastewater, and prepare for the subsequent excessive absorption of phosphorus in an aerobic environment, thereby improving the phosphorus removal effect of the device; in the pre-anoxic tank 100, the organic matter and nitrate nitrogen carried in the circulating wastewater can fully contact with the denitrifying bacteria on the first polyphosphate denitrifying bacteria filler 160 and the second polyphosphate denitrifying bacteria filler 170, thereby promoting the denitrification reaction. The circulating water flow can evenly distribute the nitrate nitrogen in the wastewater on the first polyphosphate denitrifying bacteria filler 160 and the second polyphosphate denitrifying bacteria filler 170, and use the organic matter in the wastewater as a carbon source to reduce the nitrate nitrogen to nitrogen gas, thereby improving the denitrification effect.

[0052] The above-described embodiments merely represent several implementation methods of the present disclosure. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person of ordinary skill in the art could make various modifications and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the present patent shall be determined by the appended claims.

Claims

1. A PVP production wastewater treatment device, comprising a pre-anoxic tank, an anaerobic tank, an anoxic tank and an aerobic tank, wherein the pre-anoxic tank, the anaerobic tank, the anoxic tank and the aerobic tank are connected in sequence, characterized in that: The pre-anoxic tank is provided with a fluid chamber, and the pre-anoxic tank includes a water inlet, a water outlet, a baffle, a first reflux mixer and a second reflux mixer; the baffle is provided in the fluid chamber, and the baffle divides the fluid chamber into a first reflux chamber and a second reflux chamber, the first reflux mixer is provided in the first reflux chamber, and the rotating reflux blades of the first reflux mixer are arranged toward the water outlet, the second reflux mixer is provided in the second reflux chamber, and the rotating reflux blades of the second reflux mixer are arranged toward the water inlet, so that the water flows in the first reflux chamber and the second reflux chamber in a direction from the water inlet to the water outlet; as well as, The pre-anoxic tank also includes a first polyphosphate denitrifying bacteria filler and a second polyphosphate denitrifying bacteria filler. The first polyphosphate denitrifying bacteria filler is arranged in the first reflow chamber, and the second polyphosphate denitrifying bacteria filler is arranged in the second reflow chamber, so that water flows through the first polyphosphate denitrifying bacteria filler and the second polyphosphate denitrifying bacteria filler in sequence.

2. The PVP production wastewater treatment device according to claim 1, characterized in that, The PVP production wastewater treatment device further includes a hydrolysis and acidification tank, the hydrolysis and acidification tank is connected to the water inlet, and the water outlet is connected to the anaerobic tank.

3. The PVP production wastewater treatment device according to claim 1, characterized in that, There are at least two first polyphosphate denitrifying bacteria fillers; and / or there are at least two second polyphosphate denitrifying bacteria fillers.

4. The PVP production wastewater treatment device according to claim 3, characterized in that: The first polyphosphate denitrifying bacteria filler comprises a first support frame and a first biofilm filler, wherein the first support frame is arranged at the bottom of the first reflux chamber, and the first biofilm filler is fully arranged on the first support frame; and / or, The second polyphosphate denitrifying bacteria filler comprises a second supporting frame and a second biofilm filler. The second supporting frame is arranged at the bottom of the second reflux chamber, and the second biofilm filler is fully arranged on the second supporting frame.

5. The PVP production wastewater treatment device according to claim 4, characterized in that, The first biofilm filler is a polyethylene biofilm filler or a polypropylene biofilm filler; and / or, The second biofilm-forming filler is a polyethylene biofilm-forming filler or a polypropylene biofilm-forming filler.

6. The PVP production wastewater treatment device according to claim 1, characterized in that: The first reflux mixer is a first submersible flow thruster; and / or the second reflux mixer is a second submersible flow thruster.

7. The PVP production wastewater treatment device according to claim 1, characterized in that: The PVP production wastewater treatment device further includes a secondary sedimentation tank and a sludge return pipe. The secondary sedimentation tank is connected to the aerobic tank, and the secondary sedimentation tank is connected to the pre-anoxic tank through the sludge return pipe.

8. The PVP production wastewater treatment device according to claim 7, characterized in that: The PVP production wastewater treatment device also includes a sludge treatment tank, which is connected to the secondary sedimentation tank and is used to discharge excess sludge.

9. The PVP production wastewater treatment device according to claim 1, characterized in that: The PVP production wastewater treatment device further comprises a mixed liquor reflux pipeline, and the aerobic tank is connected to the reflux port of the pre-anoxic tank through the mixed liquor reflux pipeline.

10. A wastewater treatment equipment, characterized in that: A PVP production wastewater treatment device comprising the device described in any one of claims 1 to 9.

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