CN216236265U - Multistage anoxic-aerobic integrated sewage treatment equipment - Google Patents
Multistage anoxic-aerobic integrated sewage treatment equipment Download PDFInfo
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- CN216236265U CN216236265U CN202220243672.5U CN202220243672U CN216236265U CN 216236265 U CN216236265 U CN 216236265U CN 202220243672 U CN202220243672 U CN 202220243672U CN 216236265 U CN216236265 U CN 216236265U
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Abstract
The utility model provides a multi-stage anoxic-aerobic integrated sewage treatment device, which comprises an anaerobic tank (2), a denitrification dephosphorization tank (3), a primary anoxic tank (4), a primary aerobic tank (5), a secondary anoxic tank (6), a secondary aerobic tank (7) and a sedimentation tank (8) which are sequentially arranged in the same shell, wherein a partition plate is arranged between adjacent reaction tanks, and the adjacent partition plates are provided with holes which are alternately arranged up and down; the primary anoxic tank (4) is connected with the anaerobic tank (2) through an anaerobic-anoxic reflux pump (15) to form anaerobic-anoxic internal circulation; the secondary aerobic tank (7) is connected with the denitrification dephosphorization tank (3) through an anoxic-aerobic reflux pump (16) to form anoxic-aerobic internal circulation. The treatment equipment can achieve the technical effect of high-efficiency synchronous nitrogen and phosphorus removal.
Description
Technical Field
The utility model relates to the technical field of high-nitrogen and phosphorus sewage treatment, in particular to a multistage anoxic-aerobic integrated sewage treatment device.
Background
The multi-stage Anoxic/aerobic (MAO) process is formed by combining a plurality of Anoxic tanks and aerobic tanks in series, so that the superposition of multiple nitrification reactions and denitrification reactions artificially occurs in a treatment system, and the process has high denitrification rate. However, the traditional MAO process has more AO stages and complex system, and has poor phosphorus removal effect due to lack of an anaerobic phosphorus release stage. Even with the addition of the anaerobic stage, phosphorus removal is limited. In the practical engineering application process, an advanced processing unit is often required to be added, which results in the increase of cost.
The process of Denitrifying Phosphorus Removal (DPR) refers to that NO is added with dual purposes of one carbon in an anoxic condition by using Denitrifying Phosphorus Accumulating bacteria (DPAOs) in a mode of one carbon for two purposesx --N(NO3 --N and NO2 --N) instead of O2As an electron acceptor, the method realizes the excessive absorption of phosphorus, reduces the requirements on a carbon source and oxygen and achieves the aim of reducing the cost.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
Aiming at the problems in the prior art, the utility model provides a multi-stage anoxic-aerobic integrated sewage treatment device, which aims to solve the technical problems of poor dephosphorization effect and the like in the existing sewage treatment technology.
(II) technical scheme
The utility model provides a multi-stage anoxic-aerobic integrated sewage treatment device, which comprises an anaerobic tank, a denitrification dephosphorization tank, a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank, a secondary aerobic tank and a sedimentation tank which are sequentially arranged in the same shell, wherein a partition plate is arranged between adjacent reaction tanks, and holes which are alternately arranged up and down are formed in the adjacent partition plates; the first-stage anoxic tank is connected with the anaerobic tank through an anaerobic-anoxic reflux pump to form anaerobic-anoxic internal circulation; the secondary aerobic tank is connected with the denitrification dephosphorization tank through an anoxic-aerobic reflux pump to form anoxic-aerobic internal circulation.
Furthermore, a flow guide device is arranged in the sedimentation tank.
Further, the bottom of the sedimentation tank is connected with a denitrification dephosphorization tank through a sludge reflux pump; an overflow weir is arranged at the upper part of the sedimentation tank, and a water outlet is arranged at one side of the overflow weir.
Furthermore, stirring devices are arranged in the anaerobic tank, the denitrification dephosphorization tank, the first-stage anoxic tank and the second-stage anoxic tank.
Furthermore, aeration devices are arranged in the first-stage aerobic tank and the second-stage aerobic tank.
Furthermore, water inlets are arranged above the anaerobic tank, the first-stage anoxic tank and the second-stage anoxic tank, and electric valves are arranged above the water inlets.
Furthermore, a sludge discharge pipe is arranged below the sedimentation tank.
Furthermore, the anaerobic tank and the denitrification dephosphorization tank are respectively provided with a nitrate nitrogen online monitoring device and a total phosphorus online monitoring device, and the water outlet is provided with a total nitrogen online monitoring device and a total phosphorus online monitoring device; the electric valve, the anaerobic-anoxic reflux pump, the anoxic-aerobic reflux pump, the total nitrogen online monitoring device, the total phosphorus online monitoring device and the nitrate nitrogen online monitoring device are connected into the automatic control system.
(III) advantageous effects
On one hand, the utility model provides a multi-stage anoxic-aerobic integrated sewage treatment device, and on the other hand, the anaerobic-anoxic internal circulation formed by connecting a primary anoxic tank and an anaerobic tank is beneficial to strengthening the anaerobic anoxic environment to enrich denitrifying phosphorus accumulating bacteria and ensure the sludge concentration of the anaerobic tank, thereby strengthening the phosphorus removal effect; on the other hand, the anoxic-aerobic internal circulation formed by connecting the secondary aerobic tank and the denitrification phosphorus removal tank is beneficial to improving the denitrification rate through the reflux of the nitrifying liquid and promoting the anoxic phosphorus removal process of the denitrification phosphorus removal tank, so that the phosphorus removal effect can be enhanced; short flow is avoided by the arrangement of the holes which are alternately arranged up and down on the partition plates; in addition, the denitrification and dephosphorization process in the system, particularly the denitrification and dephosphorization process, is monitored by the online monitoring device and fed back to the automatic control system, so that the sectional water inflow ratio and the internal circulation system are accurately adjusted, the denitrification and dephosphorization efficiency of the process is enhanced, the high-efficiency removal of nitrogen and phosphorus is realized, the aeration energy consumption and the carbon source requirement are saved, and the sludge yield is reduced.
Drawings
FIG. 1 is a schematic view showing the structure of a multistage anoxic-aerobic integrated sewage treatment apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic view showing the structure of a weir and the direction of water flow therein according to an embodiment of the present invention;
FIG. 3 is a schematic view of a denitrification dephosphorization optimization control system in an embodiment of the utility model;
description of reference numerals:
1, a water inlet pipeline; 2, an anaerobic tank; 3, a denitrification dephosphorization tank; 4, a first-stage anoxic tank; 5, a first-stage aerobic tank; 6, a secondary anoxic tank; 7, a secondary aerobic tank; 8, a sedimentation tank; 9, a stirring device; 10, an aeration device; 11, electrically operated valve; anaerobic-anoxic AA, internal circulation system; 13, anoxic-aerobic AO, internal circulation system; 14, a sludge return system; anaerobic-anoxic AA, reflux pump; 16, anoxic-aerobic AO, a reflux pump 17, a sludge reflux pump; 18, a flow guide device; 19, a weir; 20, a water outlet; 21, a sludge discharge pipe; 22, a nitrate nitrogen online monitoring device; 23, a total phosphorus on-line monitoring device; 24, a total nitrogen online monitoring device; and 25, automatically controlling the system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
The utility model designs an efficient and synchronous nitrogen and phosphorus removal integrated sewage treatment device based on a denitrification phosphorus removal theory and an MAO process.
The embodiment provides a multi-stage anoxic-aerobic integrated sewage treatment device, which comprises an anaerobic tank 2, a denitrification dephosphorization tank 3, a primary anoxic tank 4, a primary aerobic tank 5, a secondary anoxic tank 6, a secondary aerobic tank 7 and a sedimentation tank 8 which are sequentially arranged in the same shell, wherein a partition plate is arranged between every two adjacent reaction tanks, and holes which are alternately arranged up and down are formed in every two adjacent partition plates; the primary Anoxic tank 4 is connected with the Anaerobic tank 2 through an AA reflux pump 15 to form Anaerobic-Anoxic (AA) internal circulation; the secondary aerobic tank 7 is connected with the denitrification dephosphorization tank 3 through an AO reflux pump 16 to form Anoxic-Aerobic (AO) internal circulation.
The anaerobic tank 2 mainly carries out an anaerobic phosphorus release process; denitrifying phosphorus accumulating bacteria in the denitrifying phosphorus removal tank 3 perform anoxic phosphorus absorption and denitrification processes; the primary anoxic tank 4 and the secondary anoxic tank 6 mainly perform a denitrification process; the primary aerobic tank 5 and the secondary aerobic tank 7 mainly carry out a nitration process and an aerobic phosphorus absorption process; the sedimentation tank 8 is mainly used for separating mud and water.
The reaction tank is in the same casing, and each reaction tank passes through the baffle and separates, and the baffle is equipped with the hole so that mixed liquid passes through, and the hole on the adjacent baffle is arranged the setting from top to bottom in turn, as shown in figure 1, through the setting of the hole of arranging from top to bottom in turn of baffle, avoids short flow.
The first-stage anoxic tank 4 is provided with an AA reflux pump 15 and is connected to the anaerobic tank 2 through an AA internal circulation system 12. The secondary aerobic tank 7 is provided with an AO reflux pump 16 and is connected to the denitrification dephosphorization tank 3 through an AO internal circulation system 13. The AA internal circulation system 12 has the functions of enriching denitrifying phosphorus-accumulating bacteria by strengthening anaerobic and anoxic environment on one hand, ensuring the sludge concentration of the anaerobic tank on the other hand, and strengthening the phosphorus removal effect by adjusting the AA internal circulation reflux ratio. The AO internal circulation system 13 has the functions of improving the denitrification rate through the reflux of the nitrifying liquid, providing nitrate nitrogen for denitrifying phosphorus-accumulating bacteria of the denitrifying phosphorus-removing tank 3 as an electron acceptor to carry out an anoxic phosphorus-absorbing process, and enhancing the denitrification and phosphorus-removing effect by adjusting the reflux ratio of the AO internal circulation.
On the basis of the above embodiment, a flow guiding device 18 is arranged in the sedimentation tank 8.
On the basis of the above embodiment, the bottom of the sedimentation tank 8 is connected with the denitrification dephosphorization tank 3 through a sludge reflux pump 17; an overflow weir 19 is arranged at the upper part of the sedimentation tank 8, and a water outlet 20 is arranged at one side of the overflow weir 19.
The bottom of the sedimentation tank 8 is provided with a sludge return pump 17 and is connected to the denitrification dephosphorization tank 3 through a sludge return system 14, the sedimentation tank is provided with an overflow weir 19, one side of the overflow weir is provided with a water outlet 20, and fig. 2 shows the specific structure of the overflow weir 19 and the water flow direction therein.
On the basis of the above embodiment, the anaerobic tank 2, the denitrification dephosphorization tank 3, the primary anoxic tank 4 and the secondary anoxic tank 6 are provided with stirring devices 9.
The reaction tank under the anaerobic and anoxic environment needs to be provided with a stirring device 9, so that the sewage solution is uniformly stirred. The dissolved oxygen content of the anaerobic tank 2 is below 0.2mg/L, and the hydraulic retention time is 1-2 h. The content of dissolved oxygen in the denitrification dephosphorization tank 3, the first-stage anoxic tank 4 and the second-stage anoxic tank 6 is 0.2-0.5 mg/L, and the hydraulic retention time is 1-2 h.
On the basis of the above embodiment, the primary aerobic tank 5 and the secondary aerobic tank 7 are provided with aeration devices 10.
The reaction tank in the oxygen-enriched environment needs to be provided with an aeration device 10 to provide enough oxygen for the reaction tank to carry out the nitrification process and the aerobic phosphorus absorption process. The dissolved oxygen content of the first-stage aerobic tank 5 and the second-stage aerobic tank 7 is 2-3 mg/L, and the hydraulic retention time is 3-5 h. The reflux ratio of the AA internal circulation system 12 to the AO internal circulation system 13 is 100 to 200 percent.
On the basis of the above embodiment, the water inlets are arranged above the anaerobic tank 2, the primary anoxic tank 4 and the secondary anoxic tank 6, and the electric valve 11 is arranged above the water inlets.
The sewage enters an anaerobic tank 2, a primary anoxic tank 4 and a secondary anoxic tank 6 respectively in three sections so as to fully utilize a raw water carbon source. Each water inlet is provided with an electric valve 11 so as to adjust the flow, and each water inlet is connected with the water inlet pipeline 1. The anaerobic tank 2 utilizes a carbon source in the first stage sewage to carry out anaerobic phosphorus release, then the mixed liquid in the anaerobic tank 2 enters the denitrification phosphorus removal tank 3, the denitrification phosphorus removal bacteria carry out an anoxic phosphorus absorption process by taking nitrate nitrogen from the AO internal circulation system 13 as an electron acceptor, the mixed liquid in the denitrification phosphorus removal tank 3 enters the first-stage anoxic tank 4, the carbon source in the second stage sewage is utilized to further remove the nitrate nitrogen in the mixed liquid through the denitrification effect of the denitrification bacteria, and the phenomenon that the nitrate nitrogen enters the anaerobic tank 2 through the AA internal circulation system 12 to influence the anaerobic phosphorus release process is avoided.
On the basis of the above embodiment, a sludge discharge pipe 21 is also arranged below the sedimentation tank 8.
The sedimentation tank 8 is connected to the denitrification dephosphorization tank 3 through the sludge reflux system 14, so that the nitrate in the sedimentation tank 8 is prevented from entering the anaerobic tank 2, and the anaerobic phosphorus release environment of the anaerobic tank 2 is ensured. The sedimentation tank 8 separates mud from water of the mixed liquid from the secondary aerobic tank 7, the supernatant is discharged in the form of effluent (a water outlet 20), the sludge at the bottom returns part of the sludge to the denitrification dephosphorization tank 3 through the sludge return system 14, and part of the sludge is discharged in the form of residual sludge (a sludge discharge pipe 21). The reflux ratio of the sludge reflux system 14 is 100%.
The operation mode of the integrated equipment in this embodiment is as follows: sewage enters an anaerobic tank 2, a first-stage anoxic tank 4 and a second-stage anoxic tank 6 respectively in three sections, the anaerobic tank 2 carries out anaerobic phosphorus release by utilizing a carbon source in sectional inlet water, then mixed liquid in the anaerobic tank 2 enters a denitrification phosphorus removal tank 3, and NO from an AO internal circulation system is treated by DPAOs3the-N is taken as an electron acceptor to carry out the anoxic phosphorus absorption process, the mixed solution of the denitrification phosphorus removal tank 3 enters a first-stage anoxic tank 4, and the carbon source of the staged water inlet is utilized to lead NO in the mixed solution3the-N is further removed by the denitrification of denitrifying bacteria, the mixed liquor of the first-level anoxic tank 4 enters the first-level aerobic tank 5, on the one hand, the alkalinity provided by the anoxic denitrification process and NH in the sewage are utilized4 +N is subjected to nitration reaction to obtain NH in the sewage4 +Conversion of-N to NO3 -N, on the other hand, carrying out an aerobic phosphorus uptake process, and then introducing the mixed liquor into a secondary anoxic processThe tank 6 utilizes the carbon source in the sectional inlet water for denitrification again, and then the mixed liquid enters the secondary aerobic tank 7 for nitrification reaction and aerobic phosphorus absorption process again. The final sedimentation tank 8 is used for sludge-water separation, and the supernatant enters the overflow weir 19 and is discharged through the water outlet 20. The sludge flows back to the denitrification dephosphorization tank 3, and the residual sludge is discharged outside through a sludge discharge pipe 21.
On the basis of the above embodiment, the anaerobic tank 2 and the denitrification dephosphorization tank 3 respectively further comprise a nitrate nitrogen online monitoring device 22 and a total phosphorus online monitoring device 23, and a total nitrogen online monitoring device 24 and a total phosphorus online monitoring device 23 for effluent; the electric valve 11, the AA reflux pump 15, the AO reflux pump 16 and the online monitoring device are all connected to an automatic control system 25, and fig. 3 is a schematic diagram of the denitrification dephosphorization optimization control system in the disclosure.
The relation that the arrangement of an electric valve ensures the proportion of the sectional inflow water flow is Q2≥Q1＝2Q3And the carbon source supply of the first-stage anoxic tank is ensured, so that sufficient denitrification is performed, and the influence of nitrate nitrogen on anaerobic phosphorus release of the anaerobic tank is further avoided. When the nitrate nitrogen concentration of the anaerobic tank is higher than 0.1mg/L, the water inlet flow Q needs to be further increased2(ii) a When the total phosphorus concentration of the anaerobic tank is lower than 2 times of that of the denitrification dephosphorization tank, the water inlet flow Q needs to be increased2Or the reflux ratio of an AA (or AO) reflux pump is improved to ensure the denitrification dephosphorization function of the process; when the concentration of nitrogen and phosphorus in the effluent does not meet the discharge standard, the reflux ratio of the AA reflux pump or the AO reflux pump needs to be increased, so that the nitrogen and phosphorus removal effect of the process is enhanced.
The influent quality of the wastewater in this example is as follows: the COD concentration is 300-400 mg/L, the ammonia nitrogen concentration is 50-70 mg/L, the TN concentration is 70-90 mg/L, the TP concentration is 7-9 mg/L, and the inlet water needs to be simply pretreated by a grid and the like. The effluent quality can reach: the COD concentration is below 50mg/L, the ammonia nitrogen concentration is below 5mg/L, the TN concentration is below 15mg/L, and the total phosphorus concentration is below 0.5 mg/L.
The above embodiment shows that the total nitrogen removal rate of the integrated equipment of the utility model reaches more than 82%, and the total phosphorus removal rate reaches more than 92%. The integrated equipment can realize the high-efficiency removal of nitrogen and phosphorus by completely depending on biochemical treatment means; and further through parameter optimization, the denitrification dephosphorization function can be enhanced, so that the aeration energy consumption and the carbon source requirement are saved, and the sludge yield is reduced.
Those skilled in the art will appreciate that various combinations and/or combinations of features recited in the various embodiments and/or claims of the present disclosure can be made, even if such combinations or combinations are not expressly recited in the present disclosure. In particular, various combinations and/or combinations of the features recited in the various embodiments and/or claims of the present disclosure may be made without departing from the spirit or teaching of the present disclosure. All such combinations and/or associations are within the scope of the present disclosure.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The multi-stage anoxic-aerobic integrated sewage treatment equipment is characterized by comprising an anaerobic tank (2), a denitrification dephosphorization tank (3), a primary anoxic tank (4), a primary aerobic tank (5), a secondary anoxic tank (6), a secondary aerobic tank (7) and a sedimentation tank (8) which are sequentially arranged in the same shell, wherein a partition plate is arranged between adjacent reaction tanks, and holes which are alternately arranged up and down are formed in the adjacent partition plates;
the primary anoxic tank (4) is connected with the anaerobic tank (2) through an anaerobic-anoxic reflux pump (15) to form anaerobic-anoxic internal circulation; the secondary aerobic tank (7) is connected with the denitrification dephosphorization tank (3) through an anoxic-aerobic reflux pump (16) to form anoxic-aerobic internal circulation.
2. The multi-stage anoxic-aerobic integrated sewage treatment apparatus according to claim 1, wherein a flow guide device (18) is provided in the sedimentation tank (8).
3. The multi-stage anoxic-aerobic integrated sewage treatment equipment according to claim 1, wherein the bottom of the sedimentation tank (8) is connected with the denitrification dephosphorization tank (3) through a sludge reflux pump (17); an overflow weir (19) is arranged at the upper part of the sedimentation tank (8), and a water outlet (20) is arranged at one side of the overflow weir (19).
4. The multi-stage anoxic-aerobic integrated sewage treatment equipment according to claim 1, wherein stirring devices (9) are arranged in the anaerobic tank (2), the denitrification dephosphorization tank (3), the primary anoxic tank (4) and the secondary anoxic tank (6).
5. The multi-stage anoxic-aerobic integrated sewage treatment apparatus according to claim 4, wherein the primary aerobic tank (5) and the secondary aerobic tank (7) are provided with aeration devices (10).
6. The multi-stage anoxic-aerobic integrated sewage treatment equipment according to claim 1, wherein water inlets are arranged above the anaerobic tank (2), the primary anoxic tank (4) and the secondary anoxic tank (6), and an electric valve (11) is arranged above the water inlets.
7. The multi-stage anoxic-aerobic integrated sewage treatment apparatus according to claim 1, wherein a sludge discharge pipe (21) is further provided below the sedimentation tank (8).
8. The multi-stage anoxic-aerobic integrated sewage treatment equipment according to claim 6, wherein the anaerobic tank (2) and the denitrification dephosphorization tank (3) are respectively provided with a nitrate nitrogen online monitoring device (22) and a total phosphorus online monitoring device (23), and the water outlet is provided with a total nitrogen online monitoring device (24) and a total phosphorus online monitoring device (23);
the electric valve (11), the anaerobic-anoxic reflux pump (15), the anoxic-aerobic reflux pump (16), the total nitrogen online monitoring device (24), the total phosphorus online monitoring device (23) and the nitrate nitrogen online monitoring device (22) are connected into an automatic control system (25).
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| CN202220243672.5U CN216236265U (en) | 2022-01-29 | 2022-01-29 | Multistage anoxic-aerobic integrated sewage treatment equipment |
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| CN202220243672.5U CN216236265U (en) | 2022-01-29 | 2022-01-29 | Multistage anoxic-aerobic integrated sewage treatment equipment |
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