High total nitrogen urban sewage treatment device and method

Abstract

The embodiment of the application provides a high total nitrogen urban sewage treatment device and method, and relates to the technical field of sewage treatment. The high total nitrogen urban sewage treatment device comprises an integrated cylindrical tank body, a cross-flow device and an online dissolved oxygen instrument; the integrated cylindrical tank body is of a vertical layered upflow type structure, and is sequentially provided with an aerobic zone, a buffer zone, an anoxic zone one and an anoxic zone two from bottom to top; the bottom of the aerobic zone is provided with a water inlet pipe, the aerobic zone is provided with a microporous aerator, an aeration fan connected with the microporous aerator and a combined filler located above the microporous aerator. The scheme can save land by 50% through the integrated cylindrical tank body, the total nitrogen removal rate reaches 82.6%-92% through the biological filter layer and the cross-flow plate one for oxygen absorption, the carbon source of the anoxic zone one is saved by 20%-30%, the elastic filler ensures system stability, and the cyclone type backwashing device makes operation and maintenance more convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a high total nitrogen urban sewage treatment device and method. BACKGROUND

[0002] Urban sewage is mainly derived from domestic sewage and industrial sewage. When the quality of industrial sewage changes, it is easy to cause the total nitrogen concentration of urban sewage to increase, thereby affecting the effluent quality.

[0003] Traditional biological denitrification processes such as the AO method face core problems in treating high total nitrogen sewage: (1) Insufficient carbon source: sufficient carbon source is needed for denitrification, and a large amount of external carbon source needs to be added for low C / N sewage, which is high in cost. (2) Dissolved oxygen interference: when the nitrification liquid is returned to the anoxic zone, it is easy to bring dissolved oxygen into the aerobic zone, which inhibits the denitrification effect. (3) Poor system stability: sensitive to water quality and quantity fluctuations, which easily causes the total nitrogen in the effluent to exceed the standard.

[0004] In view of the above problems, it is necessary to provide a high total nitrogen urban sewage treatment technology to solve the above problems. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a high total nitrogen urban sewage treatment device and method. The high total nitrogen urban sewage treatment device is vertically integrated with an aerobic zone, a buffer zone, an anoxic zone one and an anoxic zone two by using an integrated cylindrical tank, and is provided with a cross-flow device along the central axis, without the need for independent structures, thereby saving more than 50% of the land compared with the traditional split tank process. The dissolved oxygen absorption biological filter layer in the buffer zone can efficiently consume excess dissolved oxygen, the cross-flow plate forms cross-flow and promotes mixing through the angle difference of the water passing holes, the total nitrogen removal rate reaches 82.6%-92%, which is better than the traditional AO method; the C / N in the anoxic zone one only needs to be controlled at 4, and the amount of external carbon source added is reduced by 20%-30%; the online dissolved oxygen instrument controls DO, the elastic filler preserves MLSS, the system has strong impact resistance and stable effluent; the cyclone type backwashing device automatically washes the filler, the cross-flow plate and other components are easy to maintain, and the operation and maintenance are convenient.

[0006] According to the high total nitrogen urban sewage treatment device provided by the embodiment of the present application, the integrated cylindrical tank, the cross-flow device and the online dissolved oxygen instrument are provided; the integrated cylindrical tank is a vertical layered upflow structure, and is sequentially provided with an aerobic zone, a buffer zone, an anoxic zone one and an anoxic zone two from bottom to top;

[0007] The bottom of the aerobic zone is provided with a water inlet pipe, the aerobic zone is provided with a microporous aerator, an aeration fan connected with the microporous aerator and a combined filler located above the microporous aerator;

[0008] The buffer zone is provided with a cross-flow plate one and a dissolved oxygen absorption biological filter layer;

[0009] The carbon source feeding pipe and the suspended filler are arranged in the anoxic zone one.

[0010] The elastic filler is arranged in the anoxic zone two, the water outlet pipe is arranged at the upper part of the anoxic zone two, the bypass pipe is connected to the water outlet pipe, the backwashing pump is arranged on the bypass pipe, the backwashing pump is connected to the lower part of the anoxic zone two through the pipeline, and the cyclone backwashing device is arranged on the pipeline.

[0011] According to some embodiments of the present application, the dissolved oxygen absorption biofilter layer is composed of a filter layer frame, a curtain fabric tensioner and a plurality of curtain fabrics; the curtain fabric tensioner is equidistantly welded to the upper and lower parts of the filter layer frame; the curtain fabrics are laid on the curtain fabric tensioner and are tensioned by the curtain fabric tensioner, and the vertical axial angle between the curtain fabrics and the integrated cylindrical tank body after being tensioned is 4-8°.

[0012] According to some embodiments of the present application, the curtain fabric tensioner comprises a rotating shaft, a curtain winding cylinder, a tensioning ratchet wheel and a tensioning rod.

[0013] The rotating shaft and the curtain winding cylinder are concentrically welded by steel pipes with different pipe diameters, the rotating shaft extends out of the curtain winding cylinder on both sides and is fixed to the filter layer frame, two tensioning holes are arranged on the outer side of the rotating shaft, and the tensioning ratchet wheel is arranged on the inner side of the rotating shaft.

[0014] A fabric clamping groove is arranged on the surface of the curtain winding cylinder.

[0015] The tensioning rod can be inserted into the tensioning hole to drive the rotating shaft, the curtain winding cylinder and the tensioning ratchet wheel to rotate synchronously clockwise, and the clamping piece for fixing the rotating position is arranged on the tensioning ratchet wheel.

[0016] According to some embodiments of the present application, the cross-flow device is arranged along the central axis of the integrated cylindrical tank body, the cross-flow device comprises a cross-flow driving machine and a driving shaft, and the cross-flow plate one and the cross-flow plate two are connected to the driving shaft.

[0017] According to some embodiments of the present application, the cross-flow plate one and the cross-flow plate two are connected to the driving shaft through the butt flanges.

[0018] According to some embodiments of the present application, the cross-flow plate one and the cross-flow plate two are consistent in structure, and the cross-flow plate one and the cross-flow plate two are respectively provided with the water passing hole one and the water passing hole two.

[0019] According to some embodiments of the present application, the microporous aerator is arranged in a square shape at the bottom of the integrated cylindrical tank body, the combined filler is a combination of a plastic ring and a polyester filament bundle, and the suspended filler is a polyethylene suspended ball.

[0020] According to some embodiments of the present application, the online dissolved oxygen meter controls the dissolved oxygen concentration of the aerobic zone to be 1.5-2 mg / L and controls the dissolved oxygen concentration of the anoxic zone one to be 0.1-0.5 mg / L.

[0021] According to some embodiments of the application, the rotational flow backwashing device has a backwashing frequency of 2-4 times per week, the MLSS in the integrated cylindrical tank is controlled at 3500-6000 mg / L, and the power of the cross-flow driving machine is 0.75 kW, and the rotating speed is 3-5 rpm

[0022] In another aspect, to solve the above technical problems, according to the embodiments of the application, the application also provides a high total nitrogen urban sewage treatment method, comprising the following steps:

[0023] S1. The urban sewage enters the aerobic zone through the water inlet pipe, the aeration blower is started, and the micro-porous aerator is used for oxygenation, the sewage is in contact with the biofilm on the combined filler during the upward process, and a nitrification reaction occurs to convert ammonia nitrogen into nitrate nitrogen;

[0024] S2. The sewage enters the buffer zone, the cross-flow plate one blocks the large bubbles and forms a uniform flow state, and then the dissolved oxygen is absorbed by the biological filter layer, and the excess dissolved oxygen is consumed by the activated sludge;

[0025] S3. The sewage enters the anoxic zone one, the carbon source is added through the carbon source adding pipe, the cross-flow device is started, the cross-flow driving machine drives the driving shaft and the cross-flow plate one and the cross-flow plate two to rotate to form cross-flow, promote the mixing of the sewage, the carbon source and the suspended filler, and a denitrification reaction occurs to convert the nitrate nitrogen into nitrogen;

[0026] S4. The sewage enters the anoxic zone two, and the secondary denitrification reaction is carried out by contacting the elastic filler, the suspended sludge is intercepted by the elastic filler, and the standard sewage is discharged through the water outlet pipe;

[0027] S5. The backwashing pump is started according to the frequency of the rotational flow backwashing device to backwash the elastic filler;

[0028] Among them, S1 to S4 monitor the dissolved oxygen concentration by an online dissolved oxygen instrument, and the air volume of the aeration blower is adjusted.

[0029] The beneficial effects of the application are:

[0030] Firstly, the integrated cylindrical tank is vertically layered, and the aerobic zone, the buffer zone, the anoxic zone one and the anoxic zone two are integrated from bottom to top, each functional zone does not need an independent structure, and is only physically separated by internal fillers and components; meanwhile, the cross-flow device is arranged along the central axis of the tank, and does not need to occupy additional horizontal space. Compared with the traditional split-pool denitrification process, the land area of the device can be reduced by more than 50%, and it is especially suitable for scenes where the land of the urban sewage treatment plant is tight, and the civil engineering investment cost is greatly reduced.

[0031] Secondly, the combined filler in the aerobic zone of the present application provides sufficient attachment sites for nitrifying bacteria, and cooperates with the microporous aerator and the aeration blower to stably supply oxygen, which can efficiently convert ammonia nitrogen into nitrate nitrogen; the dissolved oxygen absorption biological filter layer in the buffer zone quickly consumes the excess dissolved oxygen in the nitrification liquid flowing out of the aerobic zone by high-concentration activated sludge adsorbed by the curtain fabric, completely avoids the interference of dissolved oxygen on the denitrification reaction in the first anoxic zone, and creates an optimal anaerobic environment for denitrifying bacteria; the cross-flow device is driven to rotate by the cross-flow driving machine, and drives the cross-flow plate one and the cross-flow plate two to operate synchronously; the water passing holes one and the water passing holes two of the two cross-flow plates are at an angle difference of 20°, and when the sewage rises, a strong cross-flow is formed, which forcibly promotes the uniform mixing of the suspended filler, the carbon source and the nitrification liquid in the first anoxic zone, avoids the "short flow" phenomenon, and makes the denitrification reaction more sufficient.

[0032] Thirdly, in the traditional process, the excess dissolved oxygen carried by the nitrification liquid in the aerobic zone will react with the denitrification carbon source, resulting in waste of the carbon source; the present application consumes the dissolved oxygen in advance by the dissolved oxygen absorption biological filter layer, completely eliminates the invalid loss, and makes the carbon source available for the denitrification reaction; the cross-flow effect formed by the cross-flow plate one and the cross-flow plate two greatly shortens the contact distance of the carbon source and the denitrifying bacteria, and cooperates with the fixation of the bacteria by the suspended filler, further improves the carbon source conversion efficiency. Finally, the present device only needs to control the C / N of the first anoxic zone to be 4 to realize efficient denitrification, and compared with the traditional process, the external carbon source addition amount is reduced by 20%~30%, and the annual operation cost is reduced by more than 15%.

[0033] Fourthly, the online dissolved oxygen meter installed on the side wall of the aerobic zone and the first anoxic zone of the present application can monitor the dissolved oxygen concentration in real time, and link to adjust the operation frequency of the aeration blower, so as to ensure that the DO in the aerobic zone is stable at 1.5~2 mg / L and the DO in the first anoxic zone is stable at 0.1~0.5 mg / L, avoid the dissolved oxygen anomaly caused by the fluctuation of water quality and quantity, and provide a stable living environment for the microbial community; the elastic filler in the second anoxic zone can effectively intercept the suspended sludge carried in the sewage, so that the mixed liquid suspended solid concentration in the integrated cylindrical tank body is stably maintained at 3500~6000 mg / L, and the tolerance of the system to pollutants is greatly improved; at the same time, the backwashing pump and the cyclone backwashing device regularly flush the elastic filler to prevent the filler from being blocked, and further ensure the long-term stable operation of the system. Even if the total nitrogen fluctuation caused by the mixing of industrial sewage is faced, the total nitrogen of the effluent can still be stably controlled below 6 mg / L.

[0034] Five, the cross-flow plate one and the cross-flow plate two are installed in the lower clamping groove, cooperate with the roller seat and the limiting roller, can be easily pulled and disassembled, and are convenient for cleaning or replacement;The curtain fabric tensioner of the dissolved oxygen absorption biological filter layer realizes the rapid tensioning and replacement of the curtain fabric through the rotating shaft, the curtain winding cylinder and the tightening rod, without disassembling the whole filter layer frame, the maintenance efficiency is improved by 40%;The cyclone type backwashing device can set the washing frequency according to the blocking condition of the elastic filler, and the qualified water in the outlet pipe is automatically extracted by the backwashing pump for washing, without external washing water source, and the washing process does not affect the main treatment process, reduces manual intervention, and reduces the labor intensity of the operation and maintenance personnel.

[0035] Additional aspects and advantages of the application will be set forth in part in the following description, will become apparent from the following description, or will be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments of the application, it should be understood that the following drawings only show some embodiments of the application, therefore should not be regarded as a limitation to the scope, for those skilled in the art, without paying creative labor, other related drawings can also be obtained according to these drawings.

[0037] Figure 1 A high total nitrogen urban sewage treatment technology schematic diagram of the application;

[0038] Figure 2 A microporous aerator plan view of the application;

[0039] Figure 3 A dissolved oxygen absorption biological filter layer structure diagram of the application;

[0040] Figure 4 A curtain fabric tensioner structure diagram of the application;

[0041] Figure 5 An enlarged schematic diagram of the local structure of the curtain fabric tensioner of the application;

[0042] Figure 6 A three-dimensional view of the curtain fabric tensioner and the filter layer frame fixed of the application;

[0043] Figure 7 A cross-flow device structure diagram of the application;

[0044] Figure 8 An enlarged schematic diagram of the cross-flow plate two and the device docking point structure of the application;

[0045] Figure 9 A longitudinal structure sectional view of the cross-flow device of the application;

[0046] Figure 10This is a schematic diagram of a crossflow plate of the present invention;

[0047] Figure 11 This is an enlarged schematic diagram of the second projection surface of the crossflow plate of the present invention;

[0048] Icons: 1. Integrated cylindrical tank; 2. Aerobic zone; 3. Inlet pipe; 4. Aeration blower; 5. Microporous aerator; 6. Combined packing material; 7. Buffer zone; 8. Cross-flow drive motor; 810. Cross-flow plate one; 820. Cross-flow plate two; 9. Dissolved oxygen absorption biological filter layer; 10. Anoxic zone one; 11. Suspended packing material; 12. Anoxic zone two; 13. Elastic packing material; 14. Outlet pipe; 15. Backwash pump; 16. Swirl-type backwashing device; 17. Online dissolved oxygen meter 18. Carbon source dosing pipe; 801. Drive shaft; 802. Mounting base; 803. Connecting flange; 804. Lower slot; 805. Roller seat; 806. Limiting roller; 807. Water passage hole two; 808. Water passage hole one; 901. Filter layer frame; 902. Curtain tensioner; 903. Curtain fabric; 904. Rotating shaft; 905. Roller shutter cylinder; 906. Fabric slot; 907. Tensioning hole; 908. Tensioning ratchet; 909. Tensioning rod. Detailed Implementation

[0049] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0050] The method for treating high total nitrogen urban wastewater according to embodiments of this application includes the following steps:

[0051] S1. Urban sewage enters the aerobic zone 2 through the inlet pipe 3. The aeration blower 4 is started and oxygen is supplied through the microporous aerator 5. During the sewage rise, it comes into contact with the biofilm on the combined packing material 6 and undergoes a nitrification reaction, converting ammonia nitrogen into nitrate nitrogen.

[0052] S2. Wastewater enters the buffer zone 7, where it is blocked by the crossflow plate 810 to form a uniform flow pattern and then passes through the dissolved oxygen absorption biological filter layer 9, where the activated sludge consumes the excess dissolved oxygen.

[0053] S3. Wastewater enters the anoxic zone 10 and carbon source is added through carbon source dosing pipe 18. The cross-flow device is activated. The cross-flow drive motor 8 drives the drive shaft 801 and cross-flow plate 810 and cross-flow plate 820 to rotate and form cross-flow, which promotes the mixing of wastewater, carbon source and suspended packing 11, and the denitrification reaction is carried out to convert nitrate nitrogen into nitrogen gas.

[0054] S4. Wastewater enters the anoxic zone 12 and comes into contact with the elastic packing material 13 to carry out a secondary denitrification reaction. The elastic packing material 13 intercepts suspended sludge, and the qualified wastewater is discharged through the effluent pipe 14.

[0055] S5. Start the backwash pump 15 at the frequency of the swirl backwash device 16 to backwash the elastic packing 13;

[0056] Among them, S1 to S4 monitor the dissolved oxygen concentration through the online dissolved oxygen meter 17 and adjust the air volume of the aeration blower 4 accordingly.

[0057] like Figures 1-11 As shown in the embodiment of this application, a high total nitrogen urban wastewater treatment device includes an integrated cylindrical tank 1, a cross-flow device, and an online dissolved oxygen meter 17; the integrated cylindrical tank 1 has a vertical layered upflow structure, and is provided with an aerobic zone 2, a buffer zone 7, an anoxic zone one 10, and an anoxic zone two 12 from bottom to top; the buffer zone 7 is located on the side opposite to the aerobic zone 2 and the anoxic zone one 10; the anoxic zone two 12 is located above the anoxic zone one 10;

[0058] The aerobic zone 2 has an inlet pipe 3 at the bottom, and a microporous aerator 5, an aeration blower 4 connected to the microporous aerator 5, and a combined packing material 6 located above the microporous aerator 5 are provided in the aerobic zone 2.

[0059] like Figure 2 As shown, there are four microporous aerators 5, arranged in a square at the bottom of the integrated cylindrical tank 1, and connected to the aeration blower 4 outside the integrated cylindrical tank 1 through a pipe; the combined packing 6 is a combination of plastic rings and polyester filament bundles, and the suspended packing 11 is a polyethylene suspended ball.

[0060] The buffer zone 7 is equipped with a crossflow plate 810 and a dissolved oxygen absorption biofilter layer 9; wherein, the anoxic zone 10 is located above the dissolved oxygen absorption biofilter layer 9.

[0061] The anoxic zone 10 is equipped with a carbon source dosing pipe 18 and a suspended packing 11. The cross-flow plate 820 is located above the suspended packing 11. The carbon source dosing pipe 18 is located above the buffer zone 7. The excess dissolved oxygen in the aerobic zone 2 is consumed by the buffer zone 7 and then mixed with the carbon source to reduce the inhibition of denitrification by dissolved oxygen and save carbon source.

[0062] Specifically, the carbon source added by carbon source dosing tube 18 is a 20% sodium acetate solution with a COD concentration of 165,000 mg / L. The amount of carbon source added meets the requirement that the C / N ratio in the anoxic zone -10 is controlled at 4.

[0063] The anoxic zone 2 12 is equipped with elastic packing material 13. The upper part of the anoxic zone 2 12 is equipped with a water outlet pipe 14, which is connected to a bypass pipe. The bypass pipe is equipped with a backwash pump 15, which is connected to the lower part of the anoxic zone 2 12 through a pipeline. The pipeline is equipped with a vortex backwashing device 16 to backwash the elastic packing material and prevent clogging.

[0064] The rotational flow backwash device 16 has a backwash frequency of 2-4 times per week; the MLSS in the integrated cylindrical tank 1 is controlled at 3500-6000 mg / L; the power of the cross-flow driving machine 8 is 0.75 kW, and the rotating speed is 3-5 rpm.

[0065] Specifically, the elastic filler 13 is arranged above the anoxic zone 12 for intercepting sludge and maintaining high sludge concentration. The filler is backwashed periodically with the produced water of the device. The rotational flow backwash device 16 is used for backwashing. According to the plugging condition of the filler, the backwash frequency is 2-4 times per week.

[0066] The online dissolved oxygen meter 17 is installed on the sidewall of the aerobic zone 2 and the anoxic zone 1 respectively. The running frequency of the aeration fan 4 can be controlled according to the data of dissolved oxygen.

[0067] The online dissolved oxygen meter 17 controls the dissolved oxygen concentration of the aerobic zone 2 at 1.5-2 mg / L and the dissolved oxygen concentration of the anoxic zone 1 at 0.1-0.5 mg / L.

[0068] As shown in Figures 4 to 6 , the dissolved oxygen absorption biological filter layer 9 is composed of a filter layer frame 901, a curtain fabric tensioner 902 and a plurality of curtain fabrics 903. The filter layer frame 901 is a steel structure, and the curtain fabric tensioner 902 is welded equidistantly on the upper and lower parts of the filter layer frame 901. The curtain fabrics 903 are laid on the curtain fabric tensioner 902 and are tensioned by the curtain fabric tensioner 902. After being tensioned, the curtain fabrics 903 have a vertical and axial angle of 4-8° with the integrated cylindrical tank 1, and the curtain fabrics 903 are made of a material that can easily absorb active sludge, so that a high sludge concentration is formed. When the nitrified liquid treated in the aerobic zone enters the dissolved oxygen absorption biological filter layer 9, the dissolved oxygen is quickly consumed to prevent excess dissolved oxygen from entering the anoxic zone 1.

[0069] As shown in Figure 4 , the curtain fabric tensioner 902 includes a rotating shaft 904, a roller tube 905, a tensioning ratchet 908 and a tensioning rod 909.

[0070] The rotating shaft 904 and the roller tube 905 are concentrically welded with different pipe diameters. The rotating shaft 904 extends out of the roller tube 905 on both sides and is fixed to the filter layer frame 901. Two tensioning holes 907 are arranged on the outer side of the rotating shaft 904, and the tensioning ratchet 908 is arranged on the inner side of the rotating shaft 904.

[0071] The roller tube 905 is provided with a fabric clamping groove 906. The fabric clamping groove 906 has an open side away from the tensioning hole 907 and a closed side close to the tensioning hole 907. The curtain fabric 903 can be easily put into the fabric clamping groove 906.

[0072] The tightening rod 909 is a movable component, which can be inserted into the tightening hole 907 to drive the rotating shaft 904, the roller shutter cylinder 905 and the tightening ratchet 908 to rotate synchronously clockwise, and the tightening ratchet 908 is provided with a clamping piece for fixing the rotating position.

[0073] The tightening rod 909 is a movable component, which can be inserted into the tightening hole 907 to drive the rotating shaft 904, the roller shutter cylinder 905 and the tightening ratchet 908 to rotate synchronously clockwise, and the tightening ratchet 908 is provided with a clamping piece for fixing the rotating position.

[0074] As shown in Figures 7 to 9 The cross-flow device is arranged along the axis of the integrated cylindrical tank 1, and the cross-flow device comprises a cross-flow drive machine 8 and a drive shaft 801, and the cross-flow plate one 810 and the cross-flow plate two 820 are connected with the drive shaft 801; the cross-flow drive machine 8 is located above the integrated cylindrical tank 1 and is fixed by bolts; the end of the drive shaft 801 is connected with the output end of the cross-flow drive machine 8, and the bottom of the drive shaft 801 penetrates into the inner cavity of the integrated cylindrical tank 1.

[0075] The bottom of the drive shaft 801 is movably mounted with a mounting base 802 through a sealing bearing, and the mounting base 802 is used for assisting the support of the drive shaft 801 to improve the stability of the support.

[0076] The cross-flow plate one 810 and the cross-flow plate two 820 are provided with a butt flange 803 between the cross-flow plate one 810 and the cross-flow plate two 820 and the drive shaft 801, and the cross-flow plate one 810 and the cross-flow plate two 820 are connected with the drive shaft 801 through the butt flange 803.

[0077] The cross-flow plate one 810 and the cross-flow plate two 820 are provided with a lower clamping groove 804 below, and the lower clamping groove 804 is an annular steel plate and is welded with the inner wall of the integrated cylindrical tank 1, and the lower clamping groove 804 is provided with a limiting roller 806; the limiting roller 806 plays a role of limiting and correcting deviation.

[0078] The limiting roller 806 is provided with a roller seat 805 above, and the roller seat 805 is an annular steel plate and is welded with the inner wall of the integrated cylindrical tank 1, and the ring width of the roller seat 805 is smaller than that of the lower clamping groove 804, so as to facilitate the installation and maintenance of the cross-flow plate one 810 and the cross-flow plate two 820.

[0079] In actual use, the cross-flow plate one 810 and the cross-flow plate two 820 are in smooth transition with the limiting roller 806 when rotating, which prevents the deviation caused by the disturbance of the rising water from affecting the dynamic balance of the device.

[0080] As shown in Figure 9As shown, the cross-flow plate one 810 and the cross-flow plate two 820 are consistent in structure, and the surface of the cross-flow plate one 810 and the cross-flow plate two 820 is respectively arranged with the water passing hole one 808 and the water passing hole two 807; the water passing hole one 808 and the water passing hole two 807 are respectively arranged in different circumferences with the center of the cross-flow plate one 810 and the cross-flow plate two 820 as the base point, each forming 9 groups of flow passing hole groups, and the adjacent flow passing hole groups are at an angle of 40°;

[0081] The cross-flow plate one 810 and the cross-flow plate two 820 are installed at different angles, and the angle difference between the flow passing hole groups is 20°, and the aperture of the water passing hole one 808 and the water passing hole two 807 is 10mm.

[0082] In actual use, the water forms cross-flow due to the different angles between the hole groups in the rising process, and the effect of cross-flow is strengthened under the action of the cross-flow driving machine 8, promoting the mixing of various substances in the anoxic zone one 10.

[0083] The working principle of the high total nitrogen municipal wastewater treatment is as follows: the municipal wastewater enters the aerobic zone 2 through the water inlet, i.e. the water inlet pipe 3, and the aeration blower 4 is started at the same time, and the aeration blower 4 performs oxygenation on the aerobic zone 2 through the microporous aerator 5. The municipal wastewater first passes through the combined filler 6 and performs nitrification reaction with the biofilm on the combined filler 6 to convert ammonia nitrogen into nitrate nitrogen during the rising process in the integrated cylindrical tank body 1; the municipal wastewater then enters the transition zone, i.e. the buffer zone 7, first passes through the cross-flow plate one 810 to block the large bubbles and form a uniform flow state, and then rises through the dissolved oxygen absorption biological filter layer 9, and relies on the respiration of the high-concentration activated sludge in the dissolved oxygen absorption biological filter layer 9 to remove the excess dissolved oxygen and reduce the interference on the denitrification reaction; the municipal wastewater after passing through the dissolved oxygen absorption biological filter layer 9 enters the anoxic zone one 10, and the carbon source is added through the carbon source adding pipe 18, and the mixed liquid of the wastewater and the carbon source rises into the suspended filler 11 and the cross-flow plate two 820, the cross-flow plate two 820 and the cross-flow plate one 810 are set at different angles of the water passing hole two 807 and the water passing hole one 808, and rotate under the action of the cross-flow driving machine 8, forming cross-flow in the anoxic zone one 10, intensifying the mixing effect of the suspended filler 11, the wastewater and the carbon source, and converting the nitrate nitrogen into nitrogen gas; finally, the municipal wastewater enters the anoxic zone two 12, and the elastic filler 13 is arranged in the anoxic zone two 12, and the secondary denitrification is performed under the condition of anoxia by using the remaining carbon source, and the elastic filler 13 can also intercept the sludge in the produced water, so as to maintain a relatively high sludge concentration in the entire process section; after the secondary denitrification, the municipal wastewater flows out through the water outlet pipe 14, the water outlet pipe 14 is provided with a bypass and connected with the backwashing pump 15, the backwashing pump 15 is started regularly to backwash the elastic filler 13, and the backwashing pipeline is connected with the cyclone type backwashing device 16 to prevent the filler from being blocked.

[0084] The on-line dissolved oxygen meter 17 is also installed on the side wall of the aerobic zone 2 and the anoxic zone one 10, which monitors the dissolved oxygen in the zone and adjusts the air volume of the aeration blower 4 to control the dissolved oxygen in the aerobic zone 2 at 1.5-2 mg / L and the dissolved oxygen in the anoxic zone one 10 at 0.1-0.5 mg / L.

[0085] Example one

[0086] In this embodiment, the main pollutants of the sewage in the adjusting pool of the sewage plant are as follows: CODCr is 80-110 mg / L, ammonia nitrogen is 15-25 mg / L, and total nitrogen is 20-30 mg / L.

[0087] The high total nitrogen municipal sewage treatment technology is provided.

[0088] In this embodiment, the integrated cylindrical tank 1 has a diameter of 12 m and a height of 9 m, and is vertically layered, wherein the aerobic zone 2 has a height of 2.5 m, the bottom is provided with 4 groups of micro-porous aerators 5, and the upper part is provided with combined fillers 6, such as plastic rings combined with polyester filament bundles; the buffer zone 7 has a height of 1.5 m, the cross-flow plate one 810 has a hole diameter of 10 mm, and the dissolved oxygen absorption biological filter layer 9 is composed of a plurality of filter layer elements with a length of 1.5 m, a width of 1 m and a height of 1 m, each element contains eight curtain fabrics 903, and the inclination angle is 6°; the anoxic zone one 10 has a height of 2.5 m, the suspended filler 11 is a polyethylene suspended ball, the upper part is provided with the cross-flow plate two 820, and the angle difference between the water passing holes two 807 of the cross-flow plate two 820 and the water passing holes one 808 of the cross-flow plate one 810 is 20°; the anoxic zone two 12 has a height of 2 m, and the top is provided with the three-dimensional elastic filler 13. The cross-flow driving machine 8 of the cross-flow device has a power of 0.75 kW and a rotating speed of 3 rpm.

[0089] During operation, the frequency of the aeration blower 4 is controlled by the on-line dissolved oxygen meter 17, the dissolved oxygen in the aerobic zone 2 is about 1.8 mg / L, the dissolved oxygen in the anoxic zone one 10 is about 0.3 mg / L, and the dissolved oxygen is reduced by 83% after passing through the dissolved oxygen absorption biological filter layer 9. The additional carbon source is a 20% sodium acetate solution, the COD concentration is about 165000 mg / L, the C / N in the anoxic zone one 10 is controlled at 4 by adding sodium acetate, the MLSS in the device is controlled at about 3500 mg / L during operation, and the cyclone type backwashing device 16 is operated twice a week.

[0090] The main pollutant concentrations before and after treatment are shown in Table 1. As shown in Table 1, the C / N of the municipal sewage is 3.7, the C / N is increased to 4 by adding a small amount of carbon source in the device, the total nitrogen removal rate is 82.6%, and the total nitrogen removal rate of the conventional AO process is about 60% under the condition that the C / N is controlled at 4. In addition, the CODCr and ammonia nitrogen removal rates of the device are also better than those of the conventional process.

[0091] Table 1-Main pollutant concentrations of sewage in and out of the plant

[0092]

[0093] Example Two

[0094] The influent of the food industry park sewage plant is selected in this example, in which the main pollutants CODCr is 130-200 mg / L, ammonia nitrogen is 45-55 mg / L, and total nitrogen is 70-85 mg / L. Influenced by food wastewater, the total nitrogen of the influent is high, and the C / N is low. The high total nitrogen municipal wastewater treatment technology provided by the application is used for denitrification treatment.

[0095] In view of the food wastewater quality, in this example, the filter element of the dissolved oxygen absorption biological filter layer 9 is 2 m long x 1 m wide x 1 m high, each element contains 12 pieces of curtain fabric 903, the inclination angle is 8°, the sludge adsorption concentration and the dissolved oxygen absorption efficiency of the dissolved oxygen absorption biological filter layer 9 are improved; the power of the cross-flow driving machine 8 of the cross-flow device is 0.75 kW, and the rotating speed is 5 rpm; during operation, the MLSS in the device is controlled at about 6000 mg / L, the cyclone type backwashing device 16 is operated once every 2 days, and the problem of easy blockage of the filler caused by sludge entraining oil is solved.

[0096] The main pollutant concentrations before and after treatment are shown in Table 2. As shown in Table 2, the wastewater C / N = 2.07, the C / N is increased to 4 by adding sodium acetate, the total nitrogen of the effluent is 6 mg / L, and the total nitrogen removal rate is as high as 92%.

[0097] Table 2 - Main pollutant concentrations of influent and effluent of food industry park sewage plant

[0098]

[0099] The above is only an example of the application and does not limit the protection scope of the application. For those skilled in the art, the application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0100] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto. Any skilled person in the art can easily think of changes or replacements within the technical scope disclosed by the application, which shall be included in the protection scope of the application. Therefore, the protection scope of the application shall be subject to the protection scope of the claims.

Claims

1. A high-total-nitrogen urban wastewater treatment device, characterized in that, include: Integrated cylindrical tank (1), cross-flow device and online dissolved oxygen meter (17); the integrated cylindrical tank (1) is a vertical layered upflow structure, and from bottom to top are arranged an aerobic zone (2), a buffer zone (7), an anoxic zone one (10) and an anoxic zone two (12). The crossflow device is arranged along the central axis of the integrated cylindrical tank (1). The crossflow device includes a crossflow drive (8) and a drive shaft (801). Crossflow plate one (810) and crossflow plate two (820) are both connected to the drive shaft (801). The aerobic zone (2) is provided with an inlet pipe (3) at the bottom, and a microporous aerator (5), an aeration blower (4) connected to the microporous aerator (5), and a combined packing material (6) located above the microporous aerator (5) are provided in the aerobic zone (2). The buffer zone (7) is provided with a crossflow plate (810) and a dissolved oxygen absorption biofilter layer (9). The anoxic zone 1 (10) is equipped with a carbon source dosing pipe (18) and a suspended packing material (11). The anoxic zone 2 (12) is equipped with elastic packing (13), and the upper part of the anoxic zone 2 (12) is equipped with a water outlet pipe (14). The water outlet pipe (14) is connected to a bypass pipe, and a backwash pump (15) is installed on the bypass pipe. The backwash pump (15) is connected to the lower part of the anoxic zone 2 (12) through a pipe, and a vortex backwashing device (16) is installed on the pipe. The dissolved oxygen absorption biofilter (9) consists of a filter layer frame (901), a curtain tensioner (902), and multiple curtain fabrics (903); the curtain tensioner (902) is welded at equal intervals to the upper and lower parts of the filter layer frame (901); the curtain fabric (903) is laid on the curtain tensioner (902) and tensioned by it, and after tensioning, the vertical axial angle between the curtain fabric (903) and the integrated cylindrical tank (1) is 4~8°. The curtain tensioner (902) includes a rotating shaft (904), a roller shutter cylinder (905), a tensioning ratchet (908), and a tensioning rod (909). The rotating shaft (904) and the roller shutter (905) are made of steel pipes of different diameters and are concentrically welded. The rotating shaft (904) extends out of the roller shutter (905) on both sides and is fixed to the filter layer frame (901). The outer section of the rotating shaft (904) is provided with two tightening holes (907), and the inner section is equipped with a tightening ratchet (908). Fabric grooves (906) are provided on the surface of the roller shutter tube (905); The tightening rod (909) can be inserted into the tightening hole (907) to drive the rotating shaft (904), the roller shutter (905) and the tightening ratchet (908) to rotate clockwise synchronously. The tightening ratchet (908) is provided with a locking device to fix the rotation position.

2. The high total nitrogen urban wastewater treatment device according to claim 1, characterized in that, Both the first flow deflector (810) and the second flow deflector (820) are provided with a docking flange (803) between them and the drive shaft (801). Both the first flow deflector (810) and the second flow deflector (820) are connected to the drive shaft (801) through the docking flange (803).

3. A high total nitrogen urban wastewater treatment device according to claim 2, characterized in that, The cross-flow plate one (810) and cross-flow plate two (820) have the same structure, and the surfaces of cross-flow plate one (810) and cross-flow plate two (820) are respectively arranged with water passage hole one (808) and water passage hole two (807).

4. A high total nitrogen urban wastewater treatment device according to claim 1, characterized in that, There are four microporous aerators (5), which are arranged in a square at the bottom of the integrated cylindrical tank (1). The combined packing (6) is a combination of plastic rings and polyester filament bundles, and the suspended packing (11) is a polyethylene suspended ball.

5. A high total nitrogen urban wastewater treatment device according to claim 1, characterized in that, The online dissolved oxygen meter (17) controls the dissolved oxygen concentration in the aerobic zone (2) to be 1.5~2 mg / L and controls the dissolved oxygen concentration in the hypoxic zone (10) to be 0.1~0.5 mg / L.

6. A high total nitrogen urban wastewater treatment device according to claim 1, characterized in that, The swirling backwashing device (16) is flushed 2 to 4 times per week; the MLSS in the integrated cylindrical tank (1) is controlled at 3500 to 6000 mg / L; the cross-flow drive motor (8) has a power of 0.75 kW and a speed of 3 to 5 rpm.

7. A method for treating urban wastewater with high total nitrogen, comprising the urban wastewater treatment device with high total nitrogen as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Urban sewage enters the aerobic zone (2) through the inlet pipe (3), and the aeration blower (4) is started. Oxygen is supplied through the microporous aerator (5). During the rise of the sewage, it comes into contact with the biofilm on the combined packing material (6) and undergoes a nitrification reaction, converting ammonia nitrogen into nitrate nitrogen. S2. Wastewater enters the buffer zone (7), where it is blocked by the crossflow plate (810) to form a uniform flow pattern, and then passes through the dissolved oxygen absorption biological filter layer (9) to consume excess dissolved oxygen using activated sludge. S3. Wastewater enters the anoxic zone 1 (10), carbon source is added through carbon source dosing pipe (18), cross-flow device is started, cross-flow drive motor (8) drives drive shaft (801) and cross-flow plate 1 (810) and cross-flow plate 2 (820) to rotate to form cross-flow, promote the mixing of wastewater, carbon source and suspended packing (11), and denitrification reaction occurs to convert nitrate nitrogen into nitrogen gas; S4. Wastewater enters the anoxic zone 2 (12) and comes into contact with the elastic packing material (13) to carry out a secondary denitrification reaction. The elastic packing material (13) intercepts suspended sludge, and the qualified wastewater is discharged through the effluent pipe (14). S5. Start the backwash pump (15) at the frequency of the swirl backwash device (16) to backwash the elastic packing (13); Among them, S1 to S4 monitor the dissolved oxygen concentration through an online dissolved oxygen meter (17) and adjust the air volume of the aeration blower (4) accordingly.

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