Composite tail water denitrification filter tank

Abstract

The utility model relates to a combined type tail water denitrification filter tank, which comprises a tank body, a water inlet pipeline, a dosing pipeline and a circulating pipeline, a water inlet area, a first filter material area, a second filter material area and a clear water area are sequentially arranged in the tank body from bottom to top, the water inlet area is communicated with the water inlet pipeline, the dosing pipeline is arranged on the water inlet pipeline, and the circulating pipeline is communicated with the first filter material area. A first aeration head pipe disc is arranged at the lower end of the first filter material area, a second aeration head pipe disc is arranged at the lower end of the second filter material area, aerobic bacteria and anaerobic bacteria are arranged in the first filter material area and the second filter material area, and the second filter material area is connected with the water inlet pipeline through a circulating pipeline. The device can be used for treating three conditions that nitrate nitrogen exceeds the standard, ammonia nitrogen exceeds the standard or nitrate nitrogen and ammonia nitrogen simultaneously exceed the standard in the effluent of the secondary sedimentation tank, and is simple and compact in overall structure.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to a composite tail water denitrification filter tank. Background Art

[0002] During the operation of the existing sewage treatment plant, due to problems such as system stability, there may be three situations where the nitrate nitrogen in the secondary sedimentation tank effluent exceeds the standard, the ammonia nitrogen exceeds the standard, or the nitrate nitrogen and ammonia nitrogen exceed the standard at the same time. The existing tail water deep treatment equipment can usually only handle one of the above situations. When the water quality of the secondary sedimentation tank effluent exceeds the standard, the water plant can only purchase other equipment to solve the problem. This not only increases the equipment purchase cost, but also prolongs the treatment time and increases the risk of environmental pollution. For example, the Chinese utility model patent with the authorization announcement number CN211471024U discloses a deep treatment system for raw water with high nitrate nitrogen and low ammonia nitrogen. The device is only suitable for treating water sources with high nitrate concentration, low ammonia nitrogen and fluctuating concentration. The Chinese invention patent with the authorization announcement number CN104058525B discloses a method for recycling and treating production wastewater containing high ammonia nitrogen and nitrate nitrogen, but the method realizes sewage treatment through different process combinations, and the corresponding process equipment has not changed substantially, so the device used in the method is also relatively complex. Utility Model Content

[0003] The utility model aims to provide a composite tailwater denitrification filter tank, which can handle three situations of excessive nitrate nitrogen, excessive ammonia nitrogen or simultaneous excessive nitrate nitrogen and ammonia nitrogen in the effluent of the secondary sedimentation tank, and has a simple and compact overall structure.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A composite tailwater denitrification filter tank comprises a tank body, a water inlet pipeline, a dosing pipeline and a circulation pipeline, wherein a water inlet area, a first filter material area, a second filter material area and a clean water area are sequentially arranged inside the tank body from bottom to top, the water inlet area is communicated with the water inlet pipeline, and a dosing pipeline is arranged on the water inlet pipeline, a first aeration head tube disc is arranged at the lower end of the first filter material area, a second aeration head tube disc is arranged at the lower end of the second filter material area, aerobic bacteria and anaerobic bacteria are arranged inside the first filter material area and the second filter material area, and the second filter material area is connected to the water inlet pipeline through a circulation pipeline.

[0006] The water inlet pipeline is provided with a water inlet pump, a water inlet control valve and a mixer in sequence along the water inlet direction, and the part of the water inlet pipeline located in the water inlet area is a water inlet distribution pipe tray.

[0007] The input end of the dosing pipeline is connected to the dosing barrel, a dosing pump and a dosing control valve are arranged in sequence on the dosing pipeline along the drug transmission direction, and the output end of the dosing pipeline is connected to the water inlet pipeline on the input side of the mixer.

[0008] The circulation pipeline is provided with a circulation pump and a circulation control valve.

[0009] The first aeration head tube disc and the second aeration head tube disc are supplied with air through an aeration pipeline, wherein the input end of the aeration pipeline is connected to an aeration fan, and the output end of the aeration pipeline is divided into a first aeration branch pipe and a second aeration branch pipe, and the first aeration branch pipe is connected to the first aeration head tube disc, and the second aeration branch pipe is connected to the second aeration head tube disc, and an aeration main control valve is provided on the aeration pipeline on the output side of the aeration fan, a first aeration control valve is provided on the first aeration branch pipe, and a second aeration control valve is provided on the second aeration branch pipe.

[0010] A first water-permeable partition layer is provided between the first filter material area and the water inlet area, and the first aeration head tube coil is provided in the first water-permeable partition layer; a second water-permeable partition layer is provided between the second filter material area and the first filter material area, and the second aeration head tube coil is provided in the second water-permeable partition layer.

[0011] A first filter plate is disposed on the lower side of the first water-permeable separation layer, and a plurality of filter head plates are vertically disposed on the lower side of the first filter plate. A second filter plate is disposed on the lower side of the second water-permeable separation layer.

[0012] A mud discharge channel and a clean water channel are arranged on the outer side of the upper end of the pool body, wherein the clean water area is connected with the mud discharge channel through a first connecting port, and the mud discharge channel is connected with the clean water channel through a second connecting port.

[0013] The water inlet pipeline is provided with a backwash water pipeline, and the backwash water pipeline is provided with a backwash water pump and a backwash water control valve in sequence. The lower side of the mud discharge channel is connected to the backwash drain pipe, and the backwash drain pipe is provided with a backwash drain pipe control valve.

[0014] A backwash air distribution pipe plate is provided in the water inlet area, the backwash air distribution pipe plate is connected to the backwash fan through a backwash air pipeline, and a backwash air control valve for controlling the on-off of the pipeline is provided on the backwash air pipeline.

[0015] The advantages and positive effects of the utility model are:

[0016] 1. The utility model is provided with aerobic bacteria and anaerobic bacteria in the first filter material area and the second filter material area, and an aeration head tube disc is provided at the lower end of the first filter material area and the lower end of the second filter material area. The utility model controls the aeration of the aeration head tube disc according to the water quality of the effluent from the secondary sedimentation tank, so as to realize that the corresponding filter material area is in an anoxic or an aerobic state. When the nitrate nitrogen in the effluent from the secondary sedimentation tank exceeds the standard, the aeration head tube disc is in a state of stopping aeration, and an anoxic environment is formed in the filter material area. In the anoxic environment, anaerobic bacteria represented by denitrifying bacteria in the filter material area will become dominant bacteria, and there is more nitrate nitrogen in the incoming water, so that the denitrifying bacteria are multiplied in large quantities and sewage treatment is achieved. When the ammonia nitrogen in the effluent from the secondary sedimentation tank exceeds the standard, the aeration head tube disc is in an aeration state, and an aerobic environment is formed in the filter material area. In the aerobic environment, aerobic bacteria represented by nitrifying bacteria in the filter material area will become dominant bacteria, and there is more ammonia nitrogen in the incoming water, so that the nitrifying bacteria are multiplied in large quantities and sewage treatment is achieved.

[0017] 2. The utility model realizes the treatment of the situation where both the ammonia nitrogen and the nitrate nitrogen in the effluent of the secondary sedimentation tank exceed the standard by setting a circulation pipeline. Specifically, when both the ammonia nitrogen and the nitrate nitrogen in the effluent of the secondary sedimentation tank exceed the standard, the first aeration head tube disc is in a stopped aeration state, and the second aeration head tube disc is in an aeration state. At this time, the first filter material area on the lower side is in an anoxic state, and the second filter material area on the upper side is in an aerobic state. After a period of cultivation, the anaerobic bacteria represented by denitrifying bacteria in the first filter material area will become the dominant bacteria to treat the situation where the nitrate nitrogen exceeds the standard, and the aerobic bacteria represented by nitrifying bacteria in the second filter material area will become the dominant bacteria to treat the situation where the ammonia nitrogen exceeds the standard, and the ammonia nitrogen in the water in the second filter material area is converted into nitrate nitrogen under the action of nitrifying bacteria. In this way, the water in the second filter material area flows back into the water inlet pipeline and the first filter material area through the circulation pipeline, and the nitrate nitrogen in the mixed liquid is converted into nitrogen gas under the action of denitrifying bacteria, thereby achieving the purpose of simultaneously removing ammonia nitrogen and nitrate nitrogen.

[0018] 3. The interior of the pool body of the utility model is provided with a water inlet area, a first filter material area, a second filter material area and a clean water area in sequence from bottom to top, and the first aeration head tube disc is arranged in the first permeable partition layer at the lower end of the first filter material area, and the second aeration head tube disc is arranged in the second permeable partition layer at the lower end of the second filter material area. The overall structure is simple and compact, and a plurality of pool body units can be combined and used according to actual needs, and the use is also relatively flexible.

[0019] 4. The backwash water pipeline of the utility model can realize two backwashing modes according to needs, one of which is that the backwash water pump and the backwash water control valve are turned on, and the water inlet control valve on the water inlet pipeline and the circulation control valve on the circulation pipeline are both closed. At this time, the backwash water in the outlet tank enters the water inlet pipeline through the backwash water pump, and enters the mud discharge channel after passing through the mixer and various parts of the tank body in turn, and finally the backwash water is discharged along the backwash discharge pipe. The other is that the backwash water pump and the backwash water control valve are turned on, and the water inlet control valve on the water inlet pipeline is closed, and then the backwash water pump is started to input a set amount of backwash water into the tank body. After the input is completed, the backwash water pump and the backwash water control valve are closed, the circulation pipeline is opened and the backwash water is circulated and cleaned in the mixer, the water inlet area, the first filter material area and the second filter material area. After the set cleaning time, the circulation pipeline is closed, the backwash water pump and the backwash water control valve are reopened and drive the backwash water to be discharged through the backwash discharge pipe.

[0020] 5. The utility model is provided with a backwashing air pipeline and a backwashing fan to cooperate to realize backwashing. After the backwashing fan is started, the air volume enters the bottom of the pool body from the backwashing air pipeline and works together with the backwashing water to realize the backwashing function. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model.

[0022] Figure 2 This is a top view of an application example of the utility model.

[0023] Figure 3 for Figure 1 Top view of the water distribution pipe tray in the middle water inlet.

[0024] Figure 4 for Figure 3 A in the enlarged view,

[0025] Figure 5 for Figure 2 Top view of the first aeration head tube disc.

[0026] Among them, 1 is the water inlet pipeline, 101 is the water inlet tank, 102 is the water inlet pump, 103 is the water inlet control valve, 104 is the mixer, 105 is the water inlet distribution pipe plate, 1051 is the water outlet hole, 2 is the dosing pipeline, 201 is the dosing tank, 202 is the dosing pump, 203 is the dosing control valve, 3 is the backwash air pipeline, 301 is the backwash fan, 302 is the backwash air control valve, 303 is the backwash air distribution pipe plate, 4 is the backwash water pipeline, 401 is the water outlet tank, 402 is the backwash water pump, 403 is the backwash water control valve, 5 is the external input pipeline, 6 is the aeration pipeline, 601 is the aeration fan, 6011 is the aeration main control valve, 602 is the second aeration branch pipe, 6021 is the second aeration control valve, 603 is the second aeration branch pipe, 604 is the second aeration control valve, 605 is the second aeration branch pipe, 606 is the second aeration branch pipe, 607 is the second aeration branch pipe, 608 is the second aeration branch pipe, 609 is the second aeration branch pipe, 610 is the second aeration branch pipe, 611 is the second aeration branch pipe, 612 is the second aeration branch pipe, 613 is the second aeration branch pipe, 614 is the second aeration branch pipe, 615 is the second aeration branch pipe, 616 is the second aeration branch pipe, 617 is the second aeration branch pipe, 618 is the second aeration branch pipe, 619 is the second aeration branch pipe, 619 is the second aeration branch pipe, 611 is the second aeration branch pipe, 612 is the second aeration branch pipe, 022 is the second aeration head tube disc, 603 is the first aeration branch pipe, 6031 is the first aeration control valve, 6032 is the first aeration head tube disc, 60321 is the aeration pipe, 7 is the tank body, 701 is the first filter plate, 7011 is the filter head plate, 702 is the first permeable partition layer, 703 is the first filter material area, 704 is the second filter plate, 705 is the second permeable partition layer, 706 is the second filter material area, 707 is the clean water area, 7071 is the first connecting port, 708 is the mud discharge channel, 709 is the clean water channel, 7091 is the second connecting port, 710 is the water inlet area, 8 is the backwashing discharge pipe, 801 is the backwashing discharge pipe control valve, 9 is the circulation pipeline, 901 is the circulation pump, 902 is the circulation control valve, and 10 is the installation area. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0028] like Figure 1 As shown, the utility model includes a tank body 7, a water inlet pipeline 1, a dosing pipeline 2 and a circulation pipeline 9, wherein the tank body 7 is provided with a water inlet area 710, a first filter material area 703, a second filter material area 706 and a clean water area 707 from bottom to top, the water inlet area 710 is connected with the water inlet pipeline 1, and the water inlet pipeline 1 is provided with a dosing pipeline 2, the lower end of the first filter material area 703 is provided with a first aeration head tube disc 6032, the lower end of the second filter material area 706 is provided with a second aeration head tube disc 6022, the first filter material area 703 and the second filter material area 706 are both provided with aerobic bacteria and anaerobic bacteria, and the second filter material area 706 is connected to the water inlet pipeline 1 through a circulation pipeline 9. When the utility model is working, for the three situations that the nitrate nitrogen in the effluent of the secondary sedimentation tank exceeds the standard, the ammonia nitrogen exceeds the standard, or the nitrate nitrogen and ammonia nitrogen exceed the standard at the same time, the utility model will present three different operating states, specifically:

[0029] When the effluent from the secondary sedimentation tank (i.e. Figure 2When the nitrate nitrogen in the water from the external input pipeline 5 exceeds the standard, the first aeration head tube disc 6032 and the second aeration head tube disc 6022 are both in the aeration stop state, and the dosing pipeline 2 is opened, the circulation pipeline 9 is in a closed state, and the equipment is in normal water intake. At this time, each filter material area is in anoxic state. In anoxic environment, after a period of cultivation, anaerobic bacteria represented by denitrifying bacteria in each filter material area will become dominant bacteria, and there is more nitrate nitrogen in the water, so the denitrifying bacteria are multiplied in large quantities and sewage treatment is achieved. The dosing pipeline 2 is started to supplement carbon source organic matter for the denitrifying bacteria, a heterotrophic bacteria, to meet their growth and metabolism needs.

[0030] When the effluent from the secondary sedimentation tank (i.e. Figure 2 When the ammonia nitrogen in the incoming water from the external input pipeline 5 exceeds the standard, the first aeration head tube disc 6032 and the second aeration head tube disc 6022 are both in the aeration state, the dosing pipeline 2 and the circulation pipeline 9 are both in the closed state, and the equipment is in normal water intake. At this time, each filter material area is in an aerobic state. Under the aerobic environment, aerobic bacteria represented by nitrifying bacteria in each filter material area will become the dominant bacteria, and there is more ammonia nitrogen in the incoming water, so nitrifying bacteria are multiplied in large numbers and sewage treatment is achieved. Nitrifying bacteria is an autotrophic bacteria that can use inorganic carbon sources as the carbon source required for its own growth, so no drug addition is required.

[0031] When the effluent from the secondary sedimentation tank (i.e. Figure 2 When the ammonia nitrogen and nitrate nitrogen in the water from the external input pipeline 5 exceed the standard, the first aeration head tube disc 6032 is in the aeration stop state, the second aeration head tube disc 6022 is in the aeration state, and the dosing pipeline 2 is started at the same time, and the equipment is normally fed with water. At this time, the first filter material area 703 is in anoxic state, and the second filter material area 706 is in an aerobic state. After a period of cultivation, the anaerobic bacteria represented by denitrifying bacteria in the first filter material area 703 will become the dominant bacteria, and the aerobic bacteria represented by nitrifying bacteria in the second filter material area 706 will become the dominant bacteria, and the ammonia nitrogen in the sewage will be converted into nitrate nitrogen under the action of the nitrifying bacteria in the second filter material area 706. At this time, the circulation pipeline 9 is started, and the water in the second filter material area 706 flows back into the water inlet pipeline 1 through the circulation pipeline 9. Then, under the action of the denitrifying bacteria in the first filter material area 703, the nitrate nitrogen in the mixed liquid is converted into nitrogen gas under the action of the denitrifying bacteria, thereby achieving the purpose of removing ammonia nitrogen and nitrate nitrogen at the same time.

[0032] In this embodiment, the aerobic bacteria can be nitrobacter and other strains as needed, and the anaerobic bacteria can be denitrifying bacteria and other strains as needed, all of which are well known in the art, and the dosing pipeline 2 adds glucose solution to provide energy for denitrifying bacteria to supplement carbon source organic matter. The utility model needs to regularly supplement aerobic bacteria and anaerobic bacteria when working, but compared with existing equipment, the utility model has a simpler and more compact structure and a higher degree of integration, and does not need to set up other devices according to different process conditions.

[0033] like Figure 1 As shown, in this embodiment, the input end of the water inlet pipeline 1 is connected to the water inlet tank 101, and the water inlet pipeline 1 is provided with a water inlet pump 102, a water inlet control valve 103 and a mixer 104 in sequence along the water inlet direction. The water inlet pipeline 1 is located in the water inlet area 710 as a water inlet distribution pipe plate 105 to cover the bottom of the pool body 7, and the dosing pipeline 2 is connected to the water inlet pipeline 1 on the input side of the mixer 104. Figure 2 As shown, the water inlet tank 101 is connected to the external input pipeline 5, so that the effluent from the secondary sedimentation tank first enters the water inlet tank 101 through the external input pipeline 5, and then is input into the water inlet area 710 at the bottom of the tank body 7 through the water inlet pump 102, and the water inlet control valve 103 controls the on-off of the pipeline according to actual needs, which is a commercially available product. In addition, in this embodiment, the mixer 104 includes a shell and a spiral tube arranged inside the shell, and the medicine input by the water inlet and the dosing pipeline 2 flows along the spiral tube to achieve mixing, and the mixer 104 can also select commercially available products with other structures according to actual needs.

[0034] like Figures 3-4 As shown, in this embodiment, the water inlet distribution pipe plate 105 includes a main pipe and a plurality of branch pipes arranged on both sides of the main pipe, wherein the main pipe is connected to the water inlet pipeline 1, and each branch pipe is provided with a water outlet hole 1051.

[0035] like Figure 1 As shown, in this embodiment, the input end of the dosing pipeline 2 is connected to the dosing barrel 201, and the dosing pipeline 2 is provided with a dosing pump 202 and a dosing control valve 203 in sequence along the drug transmission direction. The drug (glucose solution in this embodiment) enters the water inlet pipeline 1 through the action of the dosing pump 202, and the dosing control valve 203 controls the on and off of the dosing pipeline 2.

[0036] like Figure 1 As shown, in this embodiment, a circulation pump 901 and a circulation control valve 902 are provided on the circulation pipeline 9, and the water in the second filter material area 706 flows back into the water inlet pipeline 1 through the circulation pump 901, and the circulation control valve 902 controls the on and off of the circulation pipeline 9.

[0037] like Figure 1As shown, in this embodiment, the first aeration head tube disc 6032 and the second aeration head tube disc 6022 are supplied with air through the aeration pipeline 6, wherein the input end of the aeration pipeline 6 is connected to the aeration fan 601, and the output end of the aeration pipeline 6 is divided into a first aeration branch pipe 603 and a second aeration branch pipe 602, and the first aeration branch pipe 603 is connected to the first aeration head tube disc 6032, and the second aeration branch pipe 602 is connected to the second aeration head tube disc 6022. The aeration pipeline 6 on the output side of the aeration fan 601 is provided with an aeration main control valve 6011, the first aeration branch pipe 603 is provided with a first aeration control valve 6031, and the second aeration branch pipe 602 is provided with a second aeration control valve 6021. When the effluent from the secondary sedimentation tank (i.e. Figure 2 When the ammonia nitrogen and nitrate nitrogen in the external input pipeline 5 (water) exceed the standard, the aeration master control valve 6011 and the second aeration control valve 6021 are both opened, and the first aeration control valve 6031 is closed, so that the first aeration head tube disc 6032 is in the aeration stop state and the second aeration head tube disc 6022 is in the aeration state.

[0038] The first aeration head tube disc 6032 has the same structure as the second aeration head tube disc 6022. Figure 5 As shown, in this embodiment, the first aeration head tube disc 6032 and the second aeration head tube disc 6022 both include a frame and a plurality of aeration tubes 60321 equidistantly arranged in the frame, the frame and the aeration tubes 60321 are both provided with aeration holes, and each aeration hole is provided with a single-hole membrane air diffuser.

[0039] like Figure 1 As shown, in this embodiment, a first permeable partition layer 702 is provided between the first filter material area 703 and the water inlet area 710, and the first aeration head tube disc 6032 is provided in the first permeable partition layer 702, a second permeable partition layer 705 is provided between the second filter material area 706 and the first filter material area 703, and the second aeration head tube disc 6022 is provided in the second permeable partition layer 705. In this embodiment, the first permeable partition layer 702 and the second permeable partition layer 705 are both composed of magnetite filter material, garnet filter material, ilmenite filter material and pebbles, wherein a first filter plate 701 is provided at the lower side of the first permeable partition layer 702, and a second filter plate 704 is provided at the lower side of the second permeable partition layer 705, and the magnetite filter material, garnet filter material, ilmenite filter material and pebbles are carried by corresponding filter plates and the corresponding aeration head tube disc is completely buried. In addition, in this embodiment, the first filter material area 703 and the second filter material area 706 are both filled with ceramsite.

[0040] like Figure 1 As shown, in this embodiment, a plurality of filter head plates 7011 are vertically arranged at equal intervals on the lower side of the first filter plate 701 to block larger impurities.

[0041] like Figures 1-2 As shown, in this embodiment, a mud discharge channel 708 and a clean water channel 709 are provided on the outer side of the upper end of the pool body 7, wherein the clean water area 707 is connected with the mud discharge channel 708 through a first connecting port 7071, and the mud discharge channel 708 is connected with the clean water channel 709 through a second connecting port 7091. The water in the clean water area 707 first enters the mud discharge channel 708 through the first connecting port 7071, and at this time, the impurities in the water will settle in the mud discharge channel 708, while the floating water will enter the clean water channel 709 through the second connecting port 7091, and as shown in FIG. Figure 2 As shown, the treated clean water flows along the clean water channel 709 into the water outlet tank 401. Figure 1 As shown, in this embodiment, the first communication port 7071 is in the shape of a triangular weir.

[0042] like Figures 1-2 As shown, in this embodiment, the lower side of the mud discharge channel 708 is connected to the backwash drain pipe 8, and the backwash drain pipe 8 is provided with a backwash drain pipe control valve 801 for controlling the on-off of the pipeline. When the utility model performs backwashing operation, the backwash water eventually carries away the impurities in the pool body 7 and the impurities precipitated in the mud discharge channel 708 through the backwash drain pipe 8.

[0043] like Figure 1 As shown, in this embodiment, a backwash air distribution pipe disc 303 is further provided in the water inlet area 710, and the backwash air distribution pipe disc 303 is connected to the backwash fan 301 through a backwash air pipeline 3. The backwash air pipeline 3 is provided with a backwash air control valve 302 for controlling the on-off of the pipeline.

[0044] like Figures 1-2As shown, in this embodiment, a backwash water pipeline 4 is provided on the water inlet pipeline 1, and the input end of the backwash water pipeline 4 is connected to the water outlet tank 401, and a backwash water pump 402 and a backwash water control valve 403 are sequentially provided on the backwash water pipeline 4. The utility model can realize two backwashing modes, one is that the backwash water pump 402 and the backwash water control valve 403 are turned on, and at the same time, the water inlet control valve 103 on the water inlet pipeline 1 and the circulation control valve 902 on the circulation pipeline 9 are both closed. At this time, the backwash water in the water outlet tank 401 enters the water inlet pipeline 1 through the backwash water pump 402, and enters the mud discharge channel 708 after passing through the mixer 104 and various parts of the tank body 7 in sequence. At this time, the backwash discharge pipe control valve 801 on the backwash discharge pipe 8 is opened. The backwashing water is started to discharge the impurities in the pool body 7 together with the impurities in the mud discharge channel 708 along the backwashing pipe 8. The backwashing pipe control valve 801 is a flow control valve to realize the water level control in the mud discharge channel 708, thereby ensuring that the backwashing water does not enter the clean water channel 709. In addition, during this process, the backwashing fan 301 and the backwashing gas control valve 302 can be opened in coordination as needed to allow the air volume to enter the bottom of the pool body 7 from the backwashing gas pipeline 3 and work together with the backwashing water to realize the backwashing function.

[0045] Another backwashing method of the utility model is: the backwashing water pump 402 and the backwashing water control valve 403 are turned on, and the water inlet control valve 103 on the water inlet pipeline 1 is closed, and then the backwashing water pump 402 is started to input a set amount of backwashing water into the pool body 707. After the input is completed, the backwashing water pump 402 and the backwashing water control valve 403 are closed, and the circulation pump 901 and the circulation control valve 902 on the circulation pipeline 9 are turned on, and the circulation pump 901 realizes the backwashing water in the mixer 10 4. The circulation cleaning effect of the water inlet area 710, the first filter material area 703 and the second filter material area 706. After the cleaning set time, the circulation pipeline 9 is closed, the backwash water pump 402 and the backwash water control valve 403 are reopened, and the backwash water is discharged through the backwash pipe 8. In the same process, the backwash fan 301 and the backwash gas control valve 302 can be opened as needed to allow the air volume to enter the bottom of the pool body 7 from the backwash gas pipeline 3 and work together with the backwash water to achieve the backwash function.

[0046] The working principle of the utility model is:

[0047] When the utility model is working, in view of the phenomenon that the nitrate nitrogen in the effluent of the secondary sedimentation tank exceeds the standard, or the ammonia nitrogen exceeds the standard, or the nitrate nitrogen and ammonia nitrogen exceed the standard at the same time, the utility model will present three different operating states, specifically:

[0048] When the effluent from the secondary sedimentation tank (i.e. Figure 2When the nitrate nitrogen in the external input pipeline 5 (incoming water) exceeds the standard, the first aeration head tube disc 6032 and the second aeration head tube disc 6022 are both in the stop aeration state, and the dosing pipeline 2 is opened, the circulation pipeline 9 is in the closed state, and the equipment is in normal water intake. At this time, each filter material area is in anoxic state. In the anoxic environment, after a period of cultivation, the anaerobic bacteria represented by denitrifying bacteria in each filter material area will become the dominant bacteria, and there is more nitrate nitrogen in the incoming water, so the denitrifying bacteria are multiplied in large quantities and sewage treatment is achieved;

[0049] When the effluent from the secondary sedimentation tank (i.e. Figure 2 When the ammonia nitrogen in the water from the external input pipeline 5 exceeds the standard, the first aeration head tube disc 6032 and the second aeration head tube disc 6022 are both in the aeration state, the dosing pipeline 2 and the circulation pipeline 9 are both in the closed state, and the equipment is in normal water intake. At this time, each filter material area is in an aerobic state. In the aerobic environment, aerobic bacteria represented by nitrifying bacteria in each filter material area will become the dominant bacteria, and there is more ammonia nitrogen in the water, so the nitrifying bacteria are multiplied in large quantities and sewage treatment is achieved;

[0050] When the effluent from the secondary sedimentation tank (i.e. Figure 2 When the ammonia nitrogen and nitrate nitrogen in the water from the external input pipeline 5 exceed the standard, the first aeration head tube disc 6032 is in the stopped aeration state, the second aeration head tube disc 6022 is in the aeration state, and the dosing pipeline 2 and the circulation pipeline 9 are started at the same time, and the equipment is normally fed with water. At this time, the first filter material area 703 is in the anoxic state, and the second filter material area 706 is in the aerobic state. After a period of cultivation, the anaerobic bacteria represented by denitrifying bacteria in the first filter material area 703 will become the dominant bacteria, and the aerobic bacteria represented by nitrifying bacteria in the second filter material area 706 will become the dominant bacteria, and the ammonia nitrogen in the sewage is converted into nitrate nitrogen under the action of the nitrifying bacteria in the second filter material area 706, and flows back into the water inlet pipeline 1 through the circulation pipeline 9, and then the nitrate nitrogen treatment is completed under the action of the denitrifying bacteria in the first filter material area 703.

[0051] In addition to being able to achieve the above three processing states, the utility model also has a simple and compact overall structure and can be combined as needed, such as Figure 2 In an application example of the utility model shown, four tank bodies 7 units are used, and each tank body 7 is arranged in a square shape. An installation area 10 is set in the middle of the tank bodies 7 on both sides, and pumps, valves and other components of each pipeline are uniformly arranged in the installation area 10.

Claims

1. A composite tailwater denitrification filter, characterized in that: The invention comprises a tank body (7), a water inlet pipeline (1), a dosing pipeline (2) and a circulation pipeline (9), wherein the tank body (7) is provided with a water inlet area (710), a first filter material area (703), a second filter material area (706) and a clean water area (707) in sequence from bottom to top, the water inlet area (710) is communicated with the water inlet pipeline (1), and the water inlet pipeline (1) is provided with a dosing pipeline (2), a first aeration head tube disc (6032) is provided at the lower end of the first filter material area (703), a second aeration head tube disc (6022) is provided at the lower end of the second filter material area (706), aerobic bacteria and anaerobic bacteria are provided inside the first filter material area (703) and the second filter material area (706), and the second filter material area (706) is connected to the water inlet pipeline (1) via a circulation pipeline (9).

2. The composite tailwater denitrification filter according to claim 1, characterized in that: The water inlet pipeline (1) is provided with a water inlet pump (102), a water inlet control valve (103) and a mixer (104) in sequence along the water inlet direction, and the part of the water inlet pipeline (1) located in the water inlet area (710) is a water inlet distribution pipe disc (105).

3. The composite tailwater denitrification filter according to claim 2, characterized in that: The input end of the dosing pipeline (2) is connected to the dosing barrel (201), a dosing pump (202) and a dosing control valve (203) are sequentially arranged on the dosing pipeline (2) along the drug transmission direction, and the output end of the dosing pipeline (2) is connected to the water inlet pipeline (1) on the input side of the mixer (104).

4. The composite tailwater denitrification filter according to claim 1, characterized in that: The circulation pipeline (9) is provided with a circulation pump (901) and a circulation control valve (902).

5. The composite tailwater denitrification filter according to claim 1, characterized in that: The first aeration head tube disc (6032) and the second aeration head tube disc (6022) are supplied with air through an aeration pipeline (6), wherein the input end of the aeration pipeline (6) is connected to the aeration fan (601), and the output end of the aeration pipeline (6) is divided into a first aeration branch pipe (603) and a second aeration branch pipe (602), and the first aeration branch pipe (603) is connected to the first aeration head tube disc (6032), and the second aeration branch pipe (602) is connected to the second aeration head tube disc (6022), and an aeration main control valve (6011) is provided on the aeration pipeline (6) on the output side of the aeration fan (601), a first aeration control valve (6031) is provided on the first aeration branch pipe (603), and a second aeration control valve (6021) is provided on the second aeration branch pipe (602).

6. The composite tailwater denitrification filter according to claim 1, characterized in that: A first water-permeable partition layer (702) is provided between the first filter material area (703) and the water inlet area (710), and the first aeration head tube disc (6032) is provided in the first water-permeable partition layer (702); a second water-permeable partition layer (705) is provided between the second filter material area (706) and the first filter material area (703), and the second aeration head tube disc (6022) is provided in the second water-permeable partition layer (705).

7. The composite tailwater denitrification filter according to claim 6, characterized in that: A first filter plate (701) is provided on the lower side of the first water-permeable separation layer (702), and a plurality of filter head plates (7011) are vertically provided on the lower side of the first filter plate (701), and a second filter plate (704) is provided on the lower side of the second water-permeable separation layer (705).

8. The composite tailwater denitrification filter according to claim 1, characterized in that: A mud discharge channel (708) and a clean water channel (709) are provided on the outer side of the upper end of the pool body (7), wherein the clean water area (707) is connected to the mud discharge channel (708) through a first connecting port (7071), and the mud discharge channel (708) is connected to the clean water channel (709) through a second connecting port (7091).

9. The composite tailwater denitrification filter according to claim 8, characterized in that: The water inlet pipeline (1) is provided with a backwash water pipeline (4), and the backwash water pipeline (4) is provided with a backwash water pump (402) and a backwash water control valve (403) in sequence, the lower side of the mud discharge channel (708) is connected to the backwash drain pipe (8), and the backwash drain pipe (8) is provided with a backwash drain pipe control valve (801).

10. The composite tailwater denitrification filter according to claim 1, characterized in that: A backwashing air distribution pipe disc (303) is provided in the water inlet area (710), and the backwashing air distribution pipe disc (303) is connected to the backwashing fan (301) via a backwashing air pipeline (3), and a backwashing air control valve (302) for controlling the on-off of the pipeline is provided on the backwashing air pipeline (3).

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