Domestic sewage treatment device with self-cleaning denitrification biofilter

Abstract

The utility model discloses a self-cleaning denitrification biological filter domestic sewage treatment device which comprises a filter body, an overflow groove communicated with an overflow port is arranged outside the filter body, a filter material area is arranged in the filter body, and the filter material area comprises an upper filter material module and a lower filter material module which are arranged up and down. A plurality of upper channels with downward openings are uniformly arranged on the lower side of the upper filter material module at intervals, lower channels with upward openings and in one-to-one correspondence with the upper channels are arranged on the upper side of the lower filter material module, the upper channels and the lower channels are buckled to form fluid channels, and the fluid channels are filled with suspension ball filler. Flowing sewage drives the suspended ball filler to be in a fluidized state in the fluid channel and collide with each other, so that microorganisms on the suspended ball filler can fall off, filler hardening is reduced, self-cleaning of the suspended ball filler is achieved, and denitrification capacity is improved; meanwhile, the cleaning mechanism can be used for further washing the material filtering area, so that blockage in the material filtering area is reduced.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment, and in particular to a self-cleaning denitrifying biological filter for treating domestic wastewater. Background Technology

[0002] A denitrifying biological filter contains a filter media layer that utilizes the microbial community on the filter media for biological denitrification, simultaneously achieving solid-liquid separation. Its core principle lies in the fact that, under anoxic conditions, denitrifying bacteria attached to the filter media use organic carbon sources as electron donors to remove nitrate nitrogen (NOx) from the wastewater. 3- N) or nitrite nitrogen (NO) 2- Nitrogen (N) is reduced to nitrogen (N2) and released into the air, completing the denitrification process. At the same time, the filter media effectively removes suspended solids, organic matter, heavy metal ions, and other harmful substances from the water through interception, adsorption, and desorption.

[0003] However, existing denitrification biological filters suffer from problems such as packing material caking, low biofilm concentration in the filter media layer, and low denitrification load, which greatly affect the quality of the effluent. Utility Model Content

[0004] The purpose of this invention is to provide a self-cleaning denitrifying biological filter for treating domestic sewage, in order to solve problems such as packing caking, low biofilm concentration in the filter media, and low denitrification load in the existing technology.

[0005] To achieve the aforementioned objectives, the technical solution of this utility model is as follows:

[0006] A self-cleaning denitrifying biological filter for treating domestic wastewater includes a filter body. The filter body has an inlet and a outlet at its bottom, and an outlet and an overflow outlet at its top. An overflow trough communicating with the overflow outlet is located outside the filter body. The filter body contains a filter media zone, which includes upper and lower filter media modules arranged vertically. The lower side of the upper filter media module has several downward-facing upper channels at even intervals, and the upper side of the lower filter media module has upward-facing lower channels corresponding to the upper channels. The upper and lower channels interlock to form a fluid channel, which is filled with suspended ball packing material. The fluid channel confines the suspended ball packing material within a specific spatial area. Flowing wastewater causes the suspended ball packing material to become fluidized within the fluid channel, colliding with each other. This allows microorganisms on the suspended ball packing material to detach, reducing packing material caking, achieving self-cleaning of the suspended ball packing material, improving denitrification capacity, and enhancing effluent quality. The suspended ball packing and the filter media in the filter media zone work together to treat domestic sewage and make full contact with the sewage to achieve efficient removal of total nitrogen.

[0007] Preferably, the structure of the upper filter media module is the same as that of the upper filter media module, both including a grid box and filter media filling the grid box.

[0008] Preferably, the lower filter media module has several partitions evenly spaced on its lower side, and several flat sheet membranes are disposed between adjacent partitions. The two ends of each flat sheet membrane are rotatably connected to the corresponding partition via a fixed shaft. When the biological wastewater flows upward, it drives the flat sheet membranes to rotate, ensuring uniform and sufficient contact between the membranes and the wastewater. This not only efficiently removes suspended solids, bacteria, viruses, organic matter, and inorganic matter from the wastewater, but also impacts the flowing wastewater, washing away impurities on the membranes, reducing membrane clogging, and further improving the effluent quality.

[0009] Preferably, the filter body is equipped with a cleaning mechanism, including a water pump. The inlet of the water pump is connected to an overflow tank, and a return pipe is provided at the outlet. Several spray pipes are installed on the return pipe, positioned between adjacent fluid channels. Each spray pipe is equipped with several rotating nozzles, each with nozzles pointing in different directions. The cleaning mechanism can circulate treated wastewater into the filter body and spray it out through the rotating nozzles to flush the filter media, suspended ball packing, and flat sheet membrane in the filter media zone, reducing clogging and improving the self-cleaning ability of the filter body.

[0010] Preferably, an aeration system is installed at the bottom of the filter body, including an aeration pump, several aeration discs, and aeration pipes. The aeration pump is located outside the filter body, the aeration pipes are located inside the filter body, and the aeration discs are mounted on the aeration pipes. The aeration discs have inner ring aeration holes and outer ring aeration holes on their circumferential surface. The diameter of the inner ring aeration holes is smaller than that of the outer ring aeration holes. The smaller diameter of the inner ring aeration holes results in higher oxygen utilization, higher oxygenation efficiency, and longer bubble residence time. The larger diameter of the outer ring aeration holes provides a larger contact area between the rising bubbles and the wastewater, which can vigorously agitate the wastewater, drive the flat membrane to rotate, and facilitate wastewater mixing and biological reactions. The simultaneous action of the inner and outer ring aeration holes creates a flow velocity difference in the wastewater, accelerating the upward flow of the wastewater.

[0011] Preferably, the lower side of the upper channel is provided with a buckle, and the upper side of the lower channel is provided with a locking hole for engaging with the buckle. The buckle and locking hole allow the fluid channel to be disassembled for easy replacement of the suspended ball packing, resulting in a simple and convenient structure.

[0012] Preferably, the filter media is quartz sand.

[0013] The beneficial effects of this utility model are:

[0014] 1. In this invention, the fluid channel confines the suspended ball packing within a specific spatial area. Flowing wastewater causes the suspended ball packing to fluidize within the channel, colliding with each other. This allows microorganisms on the suspended ball packing to detach, reducing packing caking and achieving self-cleaning of the packing, thus improving denitrification capacity and effluent quality. The suspended ball packing and the filter media in the filter media zone work together to treat domestic wastewater, ensuring thorough contact and achieving efficient removal of total nitrogen. Simultaneously, the cleaning mechanism circulates the treated wastewater back into the filter body and sprays it through rotating nozzles to flush the filter media, suspended ball packing, and flat sheet membrane in the filter media zone, reducing clogging and improving the filter body's self-cleaning ability.

[0015] 2. In this invention, when the biological wastewater flows upward, it drives the flat sheet membrane to rotate, so that the flat sheet membrane and the wastewater are in uniform and full contact. This not only efficiently removes suspended solids, bacteria, viruses, organic matter and inorganic matter from the wastewater, but also impacts the flowing wastewater, washing off impurities on the flat sheet membrane, reducing membrane clogging and further improving the quality of the effluent. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0018] Figure 3 for Figure 1 Enlarged view of section B in the middle.

[0019] In the picture:

[0020] 1. Filter body; 11. Inlet; 12. Drain; 13. Outlet; 14. Overflow; 15. Overflow trough; 2. Upper filter media module; 21. Grille box; 22. Filter media; 3. Lower filter media module; 4. Upper channel; 41. Clip; 5. Lower channel; 51. Clip hole; 6. Suspended ball packing; 7. Baffle; 71. Flat sheet membrane; 8. Cleaning mechanism; 81. Water pump; 82. Return pipe; 83. Spray pipe; 84. Nozzle; 9. Aeration system; 91. Aeration pump; 92. Aeration disc; 93. Aeration pipe; 94. Inner ring aeration hole; 95. Outer ring aeration hole. Detailed Implementation

[0021] The technical solutions in the embodiments of this utility model will now be clearly and completely described with reference to the accompanying drawings.

[0022] The described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0023] Example

[0024] like Figure 1 As shown, a self-cleaning denitrifying biological filter for treating domestic sewage includes a filter body 1. The bottom of the filter body 1 is provided with an inlet 11 and a drain 12, and the top is provided with an outlet 13 and an overflow 14. An overflow trough 15 connected to the overflow 14 is provided outside the filter body 1.

[0025] like Figure 1 and Figure 2 As shown, the filter body 1 is provided with a filter media 22 zone, which includes an upper filter media module 2 and a lower filter media module 3 arranged vertically and having the same structure. The upper filter media module 2 includes a grid box 21 and filter media 22 filling the grid box 21. The filter media 22 is quartz sand. Several downward-facing upper channels 4 are evenly spaced on the lower side of the upper filter media module 2, and a buckle 41 is provided on the lower side of the upper channel 4. The upper side of the lower filter media module 3 is provided with an upward-facing lower channel 5 that corresponds one-to-one with the upper channel 4. A locking hole 51 is provided on the upper side of the lower channel 5 to engage with the buckle 41. The upper channel 4 and the lower channel 5 are engaged to form a fluid channel. The fluid channel is filled with suspended ball packing 6. The inner wall of the fluid channel is preferably a smooth arc shape to adapt to the suspended ball packing 6.

[0026] like Figure 1 As shown, several partitions 7 are evenly spaced on the lower side of the filter media module 3, and several flat membranes 71 are arranged between adjacent partitions 7. The two ends of each flat membrane 71 are rotatably connected to the corresponding partition 7 through a fixed shaft.

[0027] like Figure 1 and Figure 3 As shown, a cleaning mechanism 8 is provided inside the filter body 1, including a water pump 81. The inlet 11 of the water pump 81 is connected to the overflow tank 15. A return pipe 82 is provided at the outlet 13 of the water pump 81. Several spray pipes 83 are provided on the return pipe 82. The spray pipes 83 are placed between adjacent fluid channels. Several rotating nozzles are provided on each spray pipe 83. Several nozzles 84 facing different directions are provided on the rotating nozzles.

[0028] like Figure 1As shown, an aeration system 9 is installed at the bottom of the filter body 1. The aeration system 9 includes an aeration pump 91, several aeration discs 92, and aeration pipes 93. The aeration pump 91 is located outside the filter body 1, and the aeration pipes 93 are located inside the filter body 1. The aeration discs 92 are installed on the aeration pipes 93. The circumferential surface of the aeration discs 92 is provided with inner ring aeration holes 94 and outer ring aeration holes 95 located outside the inner ring aeration holes 94. The inner ring aeration holes 94 are located in the middle of the aeration discs 92, and the diameter of the inner ring aeration holes 94 is smaller than the diameter of the outer ring aeration holes 95.

[0029] In summary,

[0030] When the self-cleaning denitrifying biological filter for treating domestic sewage is in use, the biological sewage enters the filter body 1 through the inlet 11 and flows upward. The flowing sewage passes through the flat sheet membrane 71, the lower filter media module 3, the suspended ball packing 6, and the upper filter media module 2 in sequence. The clean water is discharged from the outlet 13. The overflowing clean water is discharged from the overflow outlet 14 into the overflow tank 15. The water pump 81 circulates the clean water through the return pipe 82, the spray pipe 83, and the nozzle 84 back into the filter body 1 to clean and flush the flat sheet membrane 71, the lower filter media module 3, the suspended ball packing 6, and the upper filter media module 2. The aeration system 9 provides sufficient dissolved oxygen to the domestic sewage and stirs the sewage and pushes the flat sheet membrane 71 to rotate, which helps the sewage mix and biological reaction.

[0031] The described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A self-cleaning denitrifying biological filter for treating domestic wastewater, comprising a filter body, wherein the bottom of the filter body is provided with an inlet and a outlet, and the top is provided with an outlet and an overflow outlet, and an overflow trough communicating with the overflow outlet is provided outside the filter body, characterized in that, The filter body is provided with a filter media area, which includes an upper filter media module and a lower filter media module arranged vertically. The lower side of the upper filter media module is provided with several downward-facing upper channels at even intervals, and the upper side of the lower filter media module is provided with upward-facing lower channels that correspond one-to-one with the upper channels. The upper channels and lower channels are engaged to form a fluid channel, and the fluid channel is filled with suspended ball packing.

2. The self-cleaning denitrifying biological filter for treating domestic wastewater according to claim 1, characterized in that, The structure of the upper filter media module is the same as that of the upper filter media module, both including a grid box and filter media filling the grid box.

3. The self-cleaning denitrifying biological filter for treating domestic sewage according to claim 2, characterized in that, The lower filter module has several partitions evenly spaced on its lower side, and several flat membranes are arranged between adjacent partitions. The two ends of each flat membrane are rotatably connected to the corresponding partition through a fixed shaft.

4. The self-cleaning denitrifying biological filter for treating domestic sewage according to claim 3, characterized in that, The filter body is equipped with a cleaning mechanism, including a water pump. The water pump inlet is connected to the overflow tank, and a return pipe is provided at the water outlet. Several spray pipes are provided on the return pipe. The spray pipes are placed between adjacent fluid channels. Each spray pipe is equipped with several rotating nozzles, and the rotating nozzles are equipped with several nozzles facing different directions.

5. The self-cleaning denitrifying biological filter for treating domestic sewage according to claim 2, characterized in that, An aeration system is installed at the bottom of the filter body, including an aeration pump, several aeration discs, and aeration pipes. The aeration pump is located outside the filter body, the aeration pipes are located inside the filter body, and the aeration discs are installed on the aeration pipes. The aeration discs have inner ring aeration holes and outer ring aeration holes located outside the inner ring aeration holes on their circumferential surface. The diameter of the inner ring aeration holes is smaller than the diameter of the outer ring aeration holes.

6. The self-cleaning denitrifying biological filter for treating domestic sewage according to claim 1, characterized in that, The lower side of the upper channel is provided with a buckle, and the upper side of the lower channel is provided with a snap hole for engaging with the buckle.

7. The self-cleaning denitrifying biological filter for treating domestic sewage according to claim 2, characterized in that, The filter media is quartz sand.

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