Integrated assembled sewage nitrogen and sand removal equipment

Abstract

The present application discloses an integrated assembled water treatment equipment, including a denitrification tank, a flocculation tank and a filter tank, wherein the denitrification tank is provided with a ceramsite filter material, the flocculation tank is provided with a stirring paddle and an inclined sinking pipe, the filter tank is provided with a quartz sand filter layer, the top of the denitrification tank is connected to the bottom of the flocculation tank through a pipeline, and the top of the flocculation tank is connected to the top of the filter tank through a pipeline. The present invention has the following beneficial effects: the denitrification tank, the flocculation tank and the filter tank are used together, and an integrated modular assembled installation is realized, the installation is more convenient, no odor is generated during the treatment process, and the production site is more saved.

Description

[0001] This application is a divisional application with application date of October 11, 2021, application number 2021111813015, and invention name “Integrated assembled water treatment equipment”. Technical Field

[0002] The present invention relates to the field of water purification, and in particular to an integrated assembled water treatment device. Background Art

[0003] Nowadays, a large amount of sewage is generated in industrial and agricultural production. In order to treat this sewage, many production enterprises have built simple small-scale sewage treatment plants. Small-scale sewage treatment plants generally include three pools: denitrification pool, flocculation pool and filtration pool. This type of small-scale sewage treatment plant has the following defects: first, the three pools are all exposed, and a large amount of odor will be generated during the treatment process, and there is a probability that workers will fall into the water during operation; second, the construction of a small-scale sewage treatment plant requires a large production site. Summary of the invention

[0004] In view of the above problems, the present invention proposes an integrated assembled water treatment equipment.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An integrated assembled water treatment device comprises a denitrification tank, a flocculation tank and a filtration tank, wherein the denitrification tank is provided with ceramsite filter material, the flocculation tank is provided with a stirring paddle and an inclined sinker tube, the filtration tank is provided with a quartz sand filter layer, the top of the denitrification tank is connected to the bottom of the flocculation tank through a pipeline, and the top of the flocculation tank is connected to the top of the filtration tank through a pipeline.

[0007] In this treatment equipment, a denitrification tank, a flocculation tank and a filter tank are used in combination to achieve an integrated modular assembly installation. The installation is more convenient, no odor is generated during the treatment process, and the production site is saved.

[0008] The specific functions of each tank in this equipment are as follows

[0009] In the denitrification tank, sewage flows from bottom to top (through the filter layer in the denitrification tank). Under anoxic conditions, a large number of denitrifying bacteria grow on the surface of the ceramsite filter material. At the same time, high-quality carbon sources are added to convert nitrite and nitrate into nitrogen gas through denitrification and release it from the water. Compared with the deep bed filter using quartz sand filter material, the denitrification capacity is greatly improved, which can cope with higher total nitrogen inflow and lower total nitrogen outflow requirements. In addition, this denitrification tank adopts a bottom-up flow design to avoid oxygenation of waterfalls, save carbon sources, and eliminate nitrogen drive devices. The filtration rate is higher and the cycle is longer, achieving more efficient denitrification.

[0010] Flocculation tank, add PAC to the outlet pipe of the denitrification tank, and add PAM in the flocculation tank at the same time. Utilizing the mechanical lifting of the mixer, the lower active sludge circulates in the reaction barrel, fully contacts, collides and adsorbs with the influent water, and flocculation reaction occurs continuously, thereby achieving deep removal of phosphorus and removal of suspended solids.

[0011] The filter tank passes through the quartz sand filter layer from top to bottom and is intercepted by the thick filter layer to achieve deep removal of suspended solids. The effluent SS is less than 2.0 mg / L.

[0012] It needs to be further explained that the denitrification tank, flocculation tank and filtration tank in this scheme are actually integrated into a large tank, which is mainly composed of two large cylinders. The inner large cylinder is the flocculation tank, and the gap between the inner large cylinder and the outer large cylinder is separated by an independent denitrification tank and flocculation tank.

[0013] Optionally, a circular water inlet pipe is connected to the bottom of the denitrification tank, a water retaining column is arranged inside the water inlet pipe, the diameter of the water retaining column is equal to the inner diameter of the water inlet pipe, a spiral flow channel is opened on the side wall of the water retaining column, and a hook hole is arranged at the end of the water retaining column, the water inlet pipe is made of plastic material, and the water retaining column is made of metal material.

[0014] A water retaining column is set, and a spiral flow channel starts on the side wall of the water retaining column. The diameter of the water retaining column is equal to the inner diameter of the water inlet pipe. This design is to make the water retaining column close to the wall of the water inlet pipe, and the sewage flows through the flow channel of the water retaining column. In this way, the sewage is equivalent to walking in a spiral curve in the water inlet tank. Compared with the straight line method, the spiral curve method can slow down the flow rate of sewage, making the sewage flow to the denitrification tank more stable. Secondly, it can increase the friction between water and the pipeline and the water retaining column, and increase the water temperature of the sewage, so that the denitrification reaction speed can be appropriately accelerated during denitrification. Thirdly, in the process of water constantly rubbing and colliding with the water retaining column and the water inlet pipe, the dissolved and suspended silt (including other particles of the same type) in the sewage can adhere to the water retaining column and the water inlet pipe, which can minimize the impact of silt on denitrifying bacteria during the denitrification reaction.

[0015] The specific water retaining column is supported by metal, and the surface of the water retaining column is rough, while the water inlet pipe is made of plastic, and the inner wall of the water inlet pipe is smooth. This allows most of the mud and sand particles to adhere to the surface of the water retaining column. When cleaning is needed, you only need to hook the hook hole on the water retaining column with a hook to pull the water retaining column out of the water inlet pipe.

[0016] Optionally, there are multiple water retaining columns, and the central axes of all the water retaining columns coincide with each other, the spiral directions of the flow channels on two adjacent water retaining columns are opposite, and the hook holes are connected to the flow channels.

[0017] Multiple water retaining columns are set up, and the spiral directions of two adjacent water retaining columns are opposite. This design can allow the water flow to switch repeatedly between left and right rotation. Such repeated switching can increase the collision between suspended particles in the water as much as possible, so that most of the suspended particles can be attached to the water retaining columns. At the same time, this flow direction switching of the water flow can raise the water temperature of the sewage relatively higher, and can speed up the reaction speed as much as possible during the subsequent denitrification reaction.

[0018] It should be noted that the water retaining column can remove some of the mud and other substances, but it cannot remove all of them. The mud and sand remaining in the sewage still need to be flocculated and precipitated using chemical flocculants in the flocculation tank.

[0019] Optionally, it also includes a water inlet device, which is installed at the interface of the water inlet pipe; the water inlet device includes a joint pipe, a filter barrel, an inner cylinder and a retaining ring, the filter barrel is connected to the joint pipe, the inner cylinder is arranged in the filter barrel, a hole is opened on the barrel wall of the filter barrel, the barrel wall of the inner cylinder is parallel to the barrel wall of the filter barrel, the retaining ring is arranged on the joint pipe, the retaining ring is trumpet-shaped, the filter barrel is located in the retaining ring, and there is a gap between the retaining ring and the filter barrel.

[0020] Because there are some large particles in sewage when it flows into the water inlet pipe, some of these large particles can be crushed and some cannot be crushed, so the above-mentioned water inlet device is set, when water flows through the holes on the filter barrel, the particles that can be crushed are crushed into smaller particles under the action of the holes, and the particles that cannot be crushed can be blocked outside the filter barrel. At the same time, due to the existence of the retaining ring, the large particles blocked outside the filter barrel can be collected by the retaining ring.

[0021] An inner cylinder is set in the filter barrel. This design is to use the obstruction of the inner cylinder to realize the diversion of water flow, so that the sewage is first diverted after flowing into the filter barrel, and then flows to the connecting pipe (the connecting pipe is used to connect with the water inlet pipe).

[0022] Therefore, in summary, the presence of the water inlet device can play a role in pre-crushing large particles of sediment to prevent sediment from clogging the water retaining column.

[0023] Optionally, the water inlet device further comprises a guide sleeve, wherein the guide sleeve is arranged in the inner cylinder and is parallel to the inner cylinder.

[0024] The function of the guide sleeve is to allow the water to flow steadily in one direction after it is collected.

[0025] Optionally, it also includes a drain pipe, which is arranged at the bottom of the filter tank, and the drain pipe is connected to a sterilization device; the sterilization device includes a water outlet nozzle, an inner sleeve and an outer sleeve, the water outlet nozzle is connected to the drain pipe, the water outlet nozzle is fixedly arranged at one end of the inner sleeve, and the water outlet nozzle is located outside the inner sleeve, and there is a gap between the water outlet nozzle and the inner sleeve, the outer sleeve is sleeved outside the inner sleeve, the inner sleeve is an inner sleeve made of transparent material, and an ultraviolet lamp is arranged between the inner sleeve and the outer sleeve.

[0026] Because the bacteria content in sewage is very high, after denitrification, flocculation and filtration, the bacteria content in the water cannot be effectively reduced (flocculation and filtration will absorb some bacteria), but the content is still very high. Some agricultural water has restrictions on the bacteria content in the water. If the bacteria content is too high, it cannot be used. Therefore, the above-mentioned sterilization device is set. The function of the sterilization device is to have a certain sterilization effect on the flowing water leaving the drain pipe and reduce the bacteria content in the water.

[0027] The principle of the specific sterilization device is as follows. First, the water outlet nozzle is connected to the drain pipe, and the water leaving the water outlet nozzle enters the inner sleeve. Since the water outlet nozzle is located outside the inner sleeve and there is a gap between the water outlet nozzle and the inner sleeve, a negative pressure will be formed near the water flow, and the nearby gas will be continuously pressed toward the water flow, and some of the gas will mix with the water. In this process, due to the irradiation of ultraviolet light, part of the oxygen will be converted into ozone, so that some ozone will be dissolved in the water. Since ozone can kill bacteria in the water, the bacterial content of the discharged water can be reduced.

[0028] This sterilization device is equivalent to wrapping a circle of airflow around the water column (the airflow has a tendency to flow like a water column), and a layer of ultraviolet light is wrapped around the airflow. This design can sterilize the flowing water 360 degrees without dead ends, and the sterilization is more comprehensive.

[0029] Specifically, the inner sleeve is made of glass, while the outer sleeve is made of metal, which can prevent ultraviolet rays from being exposed.

[0030] Optionally, the inner sleeve is trumpet-shaped, and the water outlet nozzle is located on one side of the narrow end of the inner sleeve, and the outer sleeve is truncated cone-shaped.

[0031] Specifically, the inner sleeve is trumpet-shaped, and the water outlet nozzle is located on the narrow end of the inner sleeve. This design allows the water flow (including air flow) to flow from narrow to wide, reducing the splashing phenomenon when the water flows out. The outer sleeve is truncated cone-shaped to facilitate the connection of some water pipes.

[0032] Optionally, a funnel-shaped arc surface is provided at the narrow end of the inner sleeve.

[0033] The purpose of setting the funnel-shaped arc surface is to guide the gas so that the gas can mix with the water flow, while reducing the dispersion of the water flow.

[0034] Optionally, the denitrification tank is connected to a vacuum pump via a pipeline (the pipeline is located above the liquid surface).

[0035] A vacuum pump is installed on the top of the denitrification tank to regularly evacuate the tank and form a negative pressure inside the tank, so that the nitrogen generated during the reaction can escape from the water, thereby accelerating the denitrification reaction.

[0036] Optionally, the inclined sinking tube is a ceramic inclined sinking tube.

[0037] The inclined sinking tank is made of clay, firstly to make the inclined sinking tube porous and absorb as many particles as possible, and secondly to reduce the weight of the entire tank and facilitate assembly.

[0038] The beneficial effects of the present invention are: a denitrification tank, a flocculation tank and a filter tank are used in combination, an integrated modular assembly installation is realized, the installation is more convenient, no odor is generated during the treatment process, and the production site is more saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of integrated assembled water treatment equipment.

[0040] Figure 2 This is a schematic diagram of the structure of the water retaining column.

[0041] Figure 3 It is a schematic diagram of the structure of the water inlet device.

[0042] Figure 4 It is a schematic cross-sectional diagram of the water inlet device.

[0043] Figure 5 It is a schematic diagram of the structure of the sterilization device.

[0044] Figure 6 It is a schematic diagram showing the matching relationship between the inner sleeve and the water outlet nozzle.

[0045] The reference numerals in the figure are: 1, water inlet pipe; 2, denitrification tank; 201, ceramsite filter material; 3, flocculation tank; 301, inclined sinker; 302, stirring paddle; 4, filter tank; 401, quartz sand; 5, drainage pipe; 6, water retaining column; 601, flow channel; 602, hook hole; 701, joint pipe; 702, guide sleeve; 703, inner cylinder; 704, retaining ring; 705, filter barrel; 801, water outlet nozzle; 802, bracket; 803, inner sleeve; 804, outer sleeve. DETAILED DESCRIPTION

[0046] The present invention is described in detail below in conjunction with the accompanying drawings.

[0047] As attached Figure 1 As shown, an integrated assembled water treatment equipment includes a denitrification tank 2, a flocculation tank 3 and a filter tank 4. The denitrification tank 2 is provided with a ceramsite filter material 201, the flocculation tank 3 is provided with a stirring paddle 302 and an inclined sinker tube 301, the filter tank 4 is provided with a quartz sand 401 filter layer, the top of the denitrification tank 2 is connected to the bottom of the flocculation tank 3 through a pipeline, and the top of the flocculation tank 3 is connected to the top of the filter tank 4 through a pipeline.

[0048] In the treatment equipment, the denitrification tank 2, the flocculation tank 3 and the filter tank 4 are used in combination to realize the integrated modular assembly installation, which is more convenient to install, no odor is generated during the treatment process, and the production site is more saved.

[0049] The specific functions of each tank in this equipment are as follows

[0050] In the denitrification tank 2, sewage flows from bottom to top (through the filter layer in the denitrification tank 2). Under anoxic conditions, a large number of denitrifying biological bacteria grow on the surface of the ceramsite filter material 201. At the same time, high-quality carbon sources are added to convert nitrite and nitrate into nitrogen gas through denitrification and release it from the water. Compared with the deep bed filter using quartz sand 401 filter material, the denitrification capacity is greatly improved, which can cope with higher total nitrogen inflow and lower total nitrogen outflow requirements. In addition, the denitrification tank 2 adopts a bottom-up flow design to avoid oxygenation of waterfalls, save carbon sources, and eliminate nitrogen drive devices. The filtration rate is higher and the cycle is longer, achieving more efficient denitrification.

[0051] Flocculation tank 3, PAC is added to the outlet pipe of denitrification tank 2, and PAM is added to flocculation tank 3. Utilizing the mechanical lifting of the mixer, the lower active sludge circulates in the reaction barrel, fully contacts, collides and adsorbs with the influent water, and flocculation reaction occurs continuously, thereby achieving deep removal of phosphorus and removal of suspended solids.

[0052] The filter tank 4 passes through the quartz sand 401 filter layer from top to bottom, and through the interception of the thick filter layer, the deep removal of suspended solids is achieved, and the SS of the effluent is less than 2.0 mg / L.

[0053] It should be further explained that the denitrification tank 2, flocculation tank 3 and filtration tank 4 in this scheme are actually integrated into a large tank, mainly composed of two large cylinders, the inner large cylinder is the flocculation tank 3, and the gap between the inner large cylinder and the outer large cylinder is separated by the independent denitrification tank 2 and flocculation tank 3.

[0054] As attached Figure 1 and 2As shown, a circular water inlet pipe 1 is connected to the bottom of the denitrification tank 2, a water retaining column 6 is arranged inside the water inlet pipe 1, the diameter of the water retaining column 6 is equal to the inner diameter of the water inlet pipe 1, a spiral flow channel 601 is opened on the side wall of the water retaining column 6, and a hook hole 602 is arranged at the end of the water retaining column 6, the water inlet pipe 1 is a water inlet pipe 1 made of plastic material, and the water retaining column 6 is a water retaining column 6 made of metal material.

[0055] A water retaining column 6 is provided, and a spiral flow channel 601 is formed on the side wall of the water retaining column 6. The diameter of the water retaining column 6 is equal to the inner diameter of the water inlet pipe 1. Such a design is to allow the water retaining column 6 to be close to the pipe wall of the water inlet pipe 1, and the sewage flows through the flow channel 601 of the water retaining column 6. In this way, the sewage in the water inlet tank is equivalent to walking in a spiral curve. Compared with the straight line, the spiral curve can slow down the flow rate of the sewage, making the sewage flow to the denitrification tank 2 more stable. Secondly, it can increase the friction between the water and the pipeline and the water retaining column 6, and improve the water temperature of the sewage, so that the denitrification reaction speed can be appropriately accelerated during denitrification. Thirdly, in the process of continuous friction and collision between the water and the water retaining column 6 and the water inlet pipe 1, the dissolved and suspended silt (including other particles of the same type) in the sewage can adhere to the water retaining column 6 and the water inlet pipe 1, so that the influence of silt on the denitrifying bacteria during the denitrification reaction can be minimized.

[0056] Specifically, the water retaining column 6 is supported by metal, and the surface of the water retaining column 6 is rough, while the water inlet pipe 1 is made of plastic, and the inner wall of the water inlet pipe 1 is smooth, so that most of the mud and sand particles can be attached to the surface of the water retaining column 6. When cleaning is needed, you only need to hook the hook hole 602 on the water retaining column 6 with a hook to pull the water retaining column 6 out of the water inlet pipe 1.

[0057] As attached Figure 2 As shown, there are multiple water retaining columns 6 , and the central axes of all water retaining columns 6 coincide with each other, the spiral directions of the flow channels 601 on two adjacent water retaining columns 6 are opposite, and the hook holes 602 are connected to the flow channels 601 .

[0058] A plurality of water retaining columns 6 are provided, and the spiral directions of two adjacent water retaining columns 6 are opposite. Such a design allows the water flow to switch repeatedly between left-hand rotation and right-hand rotation. Such repeated switching can increase the collision between suspended particles in the water as much as possible, so that most of the suspended particles can be attached to the water retaining columns 6. At the same time, such flow direction switching of the water flow can raise the water temperature of the sewage relatively higher, and can accelerate the reaction speed as much as possible during the subsequent denitrification reaction.

[0059] It should be noted that the water retaining column 6 can remove a portion of the silt and other substances, but cannot remove all of them. The silt remaining in the sewage still needs to be flocculated and precipitated by the flocculation tank 3 using a chemical flocculant.

[0060] As attached Figure 1 ,3 As shown in and 4, it also includes a water inlet device, which is installed at the interface of the water inlet pipe 1; the water inlet device includes a joint pipe 701, a filter barrel 705, an inner barrel 703 and a retaining ring 704, the filter barrel is connected to the joint pipe 701, the inner barrel 703 is arranged in the filter barrel, a hole is opened on the barrel wall of the filter barrel 705, the barrel wall of the inner barrel 703 is parallel to the barrel wall of the filter barrel, the retaining ring 704 is arranged on the joint pipe 701, the retaining ring 704 is trumpet-shaped, the filter barrel 705 is located in the retaining ring 704, and there is a gap between the retaining ring 704 and the filter barrel 705.

[0061] Because there are some large particles in the sewage when it flows into the water inlet pipe 1, some of the large particles can be crushed and some cannot be crushed, so the above-mentioned water inlet device is set. When the water flows through the holes on the filter barrel 705, the particles that can be crushed are crushed into smaller particles under the action of the holes, and the particles that cannot be crushed can be blocked outside the filter barrel 705. At the same time, due to the existence of the retaining ring 704, the large particles blocked outside the filter barrel 705 can be collected by the retaining ring 704.

[0062] An inner cylinder 703 is arranged in the filter barrel 705. This design is to utilize the obstruction effect of the inner cylinder 703 to realize the diversion of water flow, so that the sewage is first diverted after flowing into the filter barrel 705, and then flows to the joint pipe 701 (the joint pipe 701 is used to connect with the water inlet pipe 1).

[0063] Therefore, in summary, the presence of the water inlet device can play a role in pre-crushing large particles of sediment to prevent the sediment from clogging the water retaining column 6.

[0064] As attached Figure 3 and 4 As shown, the water inlet device further includes a guide sleeve 702 , which is disposed in the inner cylinder 703 , and the guide sleeve 702 is parallel to the inner cylinder 703 .

[0065] The function of the guide sleeve 702 is to allow the flowing water to flow stably in one direction after the flowing water is collected.

[0066] As attached Figure 1 , 5 As shown in 6, it also includes a drain pipe 5, which is arranged at the bottom of the filter tank 4, and is connected to a sterilization device; the sterilization device includes a water outlet nozzle 801, an inner sleeve 803 and an outer sleeve, the water outlet nozzle 801 is connected to the drain pipe 5, the water outlet nozzle 801 is fixedly arranged at one end of the inner sleeve 803, and the water outlet nozzle 801 is located outside the inner sleeve 803, and there is a gap between the water outlet nozzle 801 and the inner sleeve 803, the outer sleeve is sleeved outside the inner sleeve 803, the inner sleeve 803 is an inner sleeve 803 made of a transparent material, and an ultraviolet lamp is arranged between the inner sleeve 803 and the outer sleeve.

[0067] Because the bacteria content in sewage is very high, after denitrification, flocculation and filtration, the bacteria content in the water cannot be effectively reduced (flocculation and filtration will adsorb some bacteria), but the content is still very high. Some agricultural water has restrictions on the bacteria content in the water. If the bacteria content is too high, it cannot be used. Therefore, the above-mentioned sterilization device is set. The function of the sterilization device is to have a certain sterilization effect on the flowing water leaving the drain pipe 5, thereby reducing the bacteria content in the water.

[0068] The principle of the specific sterilization device is as follows. First, the water outlet nozzle 801 is connected to the drain pipe 5, and the water leaving the water outlet nozzle 801 enters the inner sleeve 803. Since the water outlet nozzle 801 is located outside the inner sleeve 803 and there is a gap between the water outlet nozzle 801 and the inner sleeve 803, a negative pressure will be formed near the water flow, and the nearby gas will be continuously pressed toward the vicinity of the water flow, and some of the gas will mix with the water. In this process, due to the irradiation of the ultraviolet lamp, part of the oxygen will be converted into ozone, so that some ozone will be dissolved in the water. Since ozone can kill bacteria in the water, the bacterial content of the discharged water can be reduced.

[0069] This sterilization device is equivalent to wrapping a circle of airflow around the water column (the airflow has a tendency to flow like a water column), and a layer of ultraviolet light is wrapped around the airflow. This design can sterilize the flowing water 360 degrees without dead ends, and the sterilization is more comprehensive.

[0070] Specifically, the inner sleeve 803 is made of glass, while the outer sleeve is made of metal, which can prevent ultraviolet rays from being exposed.

[0071] As attached Figure 5 and 6 As shown, the inner sleeve 803 is trumpet-shaped, and the water outlet nozzle 801 is located at one side of the narrow end of the inner sleeve 803, and the outer sleeve is truncated cone-shaped.

[0072] Specifically, the inner sleeve 803 is trumpet-shaped, and the water outlet nozzle 801 is located at the narrow end of the inner sleeve 803. This design allows the water flow (including air flow) to flow from narrow to wide, reducing the splashing phenomenon when the water flows out. The outer sleeve is truncated in shape to facilitate the connection of some water pipes.

[0073] As attached Figure 5 and 6 As shown, a funnel-shaped arc surface is provided at the narrow end of the inner sleeve 803 .

[0074] The purpose of setting the funnel-shaped arc surface is to guide the gas so that the gas can mix with the water flow, while reducing the dispersion of the water flow.

[0075] As shown in the accompanying drawings, the denitrification tank 2 is connected to a vacuum pump via a pipeline (the pipeline is located above the liquid surface).

[0076] A vacuum pump is provided on the top of the denitrification tank 2 to regularly evacuate the denitrification tank 2 so as to form a negative pressure in the denitrification tank 2, thereby facilitating the nitrogen generated during the reaction to escape from the water, thereby accelerating the denitrification reaction.

[0077] As attached Figure 1 As shown, the inclined sinking tube 301 is a ceramic inclined sinking tube 301.

[0078] The inclined sinking tank is made of clay, firstly to make the inclined sinking tube 301 porous and absorb as many particles as possible, and secondly to reduce the weight of the entire tank body and facilitate assembly.

[0079] It is necessary to further explain the Figure 1 In and attached Figure 4 The arrow in the middle indicates the direction of water flow.

[0080] The above description is only a preferred embodiment of the present invention, and does not limit the patent protection scope of the present invention. Any equivalent transformations made using the specification of the present invention, directly or indirectly used in other related technical fields, are also included in the protection scope of the present invention.

Claims

1. An integrated assembled sewage nitrogen and sand removal equipment, characterized in that: It comprises a denitrification tank, a flocculation tank and a filtration tank, wherein the denitrification tank is provided with ceramsite filter material, the flocculation tank is provided with a stirring paddle and an inclined sinking pipe, the filtration tank is provided with a quartz sand filter layer, the top of the denitrification tank is connected to the bottom of the flocculation tank through a pipeline, and the top of the flocculation tank is connected to the top of the filtration tank through a pipeline; A circular water inlet pipe is connected to the bottom of the denitrification tank, a water retaining column is arranged inside the water inlet pipe, the diameter of the water retaining column is equal to the inner diameter of the water inlet pipe, a spiral flow channel is opened on the side wall of the water retaining column, and a hook hole is arranged at the end of the water retaining column, the water inlet pipe is a plastic water inlet pipe, and the water retaining column is a metal water retaining column; There are multiple water retaining columns, and the central axes of all the water retaining columns coincide with each other, the spiral directions of the flow channels on two adjacent water retaining columns are opposite, and the hook holes are connected to the flow channels; It also includes a water inlet device, which is installed at the interface of the water inlet pipe; the water inlet device includes a joint pipe, a filter barrel, an inner barrel and a retaining ring, the filter barrel is connected to the joint pipe, the inner barrel is arranged in the filter barrel, a hole is opened on the barrel wall of the filter barrel, the barrel wall of the inner barrel is parallel to the barrel wall of the filter barrel, the retaining ring is arranged on the joint pipe, the retaining ring is trumpet-shaped, the filter barrel is located in the retaining ring, and there is a gap between the retaining ring and the filter barrel; The water inlet device further comprises a guide sleeve, which is arranged in the inner cylinder and is parallel to the inner cylinder; The surface of the water retaining column is used to attach the sediment particles; The inner cylinder makes the sewage turn after it flows into the filter barrel; The denitrification tank is connected to a vacuum pump through a pipeline; the vacuum pump is used to draw negative pressure to the denitrification tank; The inclined sinking tube is a ceramic inclined sinking tube.

2. The integrated assembled sewage nitrogen and sand removal equipment according to claim 1 is characterized in that: It also includes a drain pipe, which is arranged at the bottom of the filter tank, and is connected to a sterilization device; the sterilization device includes a water outlet nozzle, an inner sleeve and an outer sleeve, the water outlet nozzle is connected to the drain pipe, the water outlet nozzle is fixedly arranged at one end of the inner sleeve, and the water outlet nozzle is located outside the inner sleeve, and there is a gap between the water outlet nozzle and the inner sleeve, the outer sleeve is sleeved outside the inner sleeve, the inner sleeve is an inner sleeve made of transparent material, and an ultraviolet lamp is arranged between the inner sleeve and the outer sleeve.

3. The integrated assembled sewage nitrogen and sand removal equipment according to claim 2 is characterized in that: The inner sleeve is trumpet-shaped, and the water outlet nozzle is located at one side of the narrow end of the inner sleeve, and the outer sleeve is truncated cone-shaped.

4. The integrated assembled sewage nitrogen and sand removal equipment according to claim 3 is characterized in that: A funnel-shaped arc surface is arranged at the narrow end of the inner sleeve.

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