CN113443713A - Device and method for advanced denitrification treatment of high ammonia nitrogen sewage - Google Patents
Device and method for advanced denitrification treatment of high ammonia nitrogen sewage Download PDFInfo
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Abstract
The application discloses high ammonia nitrogen sewage advanced nitrogen removal treatment device and method, including former pond, anaerobic reactor, first anoxic reactor, aerobic reactor, second anoxic reactor and the sedimentation tank that connects gradually. The raw water tank is provided with a second water inlet pipeline, is connected with the first anoxic reactor through the second water inlet pipeline and is used for providing a carbon source for the denitrification reaction in the first anoxic reactor. The aerobic reactor and the first anoxic reactor are connected through an internal reflux system, the water inlet end of the internal reflux system is positioned at the tail end of the aerobic reactor, and the water outlet end of the internal reflux system is positioned at the front end of the first anoxic reactor. The sedimentation tank is provided with an external sludge reflux system, and a sludge discharge port of the sedimentation tank is respectively connected with the front end of the second anoxic reactor and the front end of the anaerobic reactor through the external sludge reflux system. The application provides a technical scheme can control sewage treatment's cost effectively, improves sewage treatment efficiency.
Description
Technical Field
The application relates to the technical field of sewage treatment, in particular to a device and a method for deep denitrification treatment of high ammonia nitrogen sewage.
Background
At the present stage, the low-carbon operation of the sewage treatment industry becomes a necessary trend under the background of the national carbon neutralization strategy. Meanwhile, in order to treat water body pollution, national discharge standards for sewage treatment are becoming stricter, especially for nitrogen and phosphorus elements which can cause water body eutrophication. The urban sewage in China generally has the condition of low C/N, and the traditional A2/O process often has the defects that nitrogen cannot be effectively removed due to lack of carbon sources, a large amount of carbon sources need to be added, and the operation cost is high.
Disclosure of Invention
The application provides a high ammonia nitrogen sewage deep denitrification treatment device and method, which can effectively control the sewage treatment cost and improve the sewage treatment efficiency.
In a first aspect, the application provides a high ammonia nitrogen sewage deep denitrification treatment device, which comprises a raw water tank, an anaerobic reactor, a first anoxic reactor, an aerobic reactor, a second anoxic reactor and a sedimentation tank which are connected in sequence;
the raw water tank is provided with a second water inlet pipeline, is connected with the first anoxic reactor through the second water inlet pipeline and is used for providing a carbon source for denitrification reaction in the first anoxic reactor;
the aerobic reactor and the first anoxic reactor are connected through an internal reflux system, the water inlet end of the internal reflux system is positioned at the tail end of the aerobic reactor, and the water outlet end of the internal reflux system is positioned at the front end of the first anoxic reactor;
the sedimentation tank is provided with an external sludge reflux system, and a sludge discharge port of the sedimentation tank is respectively connected with the front end of the second anoxic reactor and the front end of the anaerobic reactor through the external sludge reflux system.
In the process of realizing the above, the flow path of the raw water (i.e. the sewage) can be regarded as that the raw water tank is introduced into the anaerobic reactor, and then passes through the first anoxic reactor, the aerobic reactor and the second anoxic reactor in sequence and finally enters the sedimentation tank. Wherein, the sedimentation tank can return partial sludge to the anaerobic reactor and the second anoxic reactor through the sludge external return system. The aerobic reactor can return the nitrified liquid generated in the reaction to the first anoxic reactor through the internal return system. Meanwhile, the raw water pool directly supplies raw water to the first anoxic reactor through the second water inlet pipeline.
The anaerobic reactor is mainly used for releasing phosphorus, raw water and return sludge containing phosphorus discharged from a sedimentation tank are mixed in the anaerobic reactor to carry out COD (Chemical Oxygen Demand COD) absorption and phosphorus release reactions.
The first anoxic reactor is mainly used for denitrification, the effluent of the anaerobic reactor, the nitrified liquid returned from the aerobic reactor and the raw water conveyed by the raw water tank are subjected to denitrification in the first anoxic reactor, and the raw water provides a carbon source, so that the additional carbon source is not required, and the operation cost of sewage treatment can be effectively reduced; simultaneously, the ammonia nitrogen concentration is high aiming at the inlet water, so that more carbon sources in the raw water can be applied to denitrification through the second water inlet pipeline.
The effluent of the first anoxic reactor flows into the aerobic reactor, the aerobic reactor is used for nitration and phosphorus absorption reaction to remove ammonia nitrogen and phosphorus in the effluent of the first anoxic reactor, and part of the nitration liquid at the tail end of the aerobic reactor flows back to the first anoxic reactor through the internal reflux system.
The effluent of the aerobic reactor is subjected to denitrification reaction in the second anoxic reactor to further denitrify, and simultaneously, a carbon source required by the denitrification reaction is provided by the sludge of the sedimentation tank through the sludge external reflux system, so that no additional carbon source is required, the operating cost of sewage treatment can be effectively reduced, and the denitrification effect can be effectively improved by arranging the second anoxic reactor.
And discharging water from the second anoxic reactor to a sedimentation tank, separating mud and water, discharging supernatant, returning a part of bottom sludge to the front end of the anaerobic reactor, returning a part of bottom sludge to the front end of the second anoxic reactor, and discharging residual sludge. It should be noted that TP (total phosphorus), TN (total nitrogen), COD (chemical oxygen demand) and NH (NH) of the discharged supernatant are treated section by the anaerobic reactor, the first anoxic reactor, the aerobic reactor and the second anoxic reactor4 +N is the value of ammonium nitrogen, so that the sewage treated by the sewage deep denitrification treatment device meets the requirement, and the sewage deep denitrification treatment deviceThe effluent quality meets the discharge requirement.
Optionally, the raw water pool is provided with a first water inlet pipeline, the first water inlet pipeline is connected with the anaerobic reactor, and a first flow regulating unit is arranged on the first water inlet pipeline;
the second water inlet pipeline is provided with a second flow regulating unit.
Optionally, the first flow rate regulating unit comprises a first water inlet regulating valve and a first water inlet flow meter;
the second flow regulating unit comprises a second water inlet regulating valve and a second water inlet flow meter.
Optionally, the external sludge return system comprises a first sludge return line and a second sludge return line which are independent of each other, the first sludge return line is connected with the front end of the anaerobic reactor and the sedimentation tank, and the second sludge return line is connected with the front end of the second anoxic reactor and the sedimentation tank;
the first sludge return pipeline and the second sludge return pipeline are both provided with sludge flow regulating units.
Optionally, the aerobic reactor is provided with an aeration system for aerating the aerobic reactor.
Optionally, the aerobic reactor is provided with a dissolved oxygen monitoring unit for acquiring dissolved oxygen data of the aerobic reactor;
the dissolved oxygen monitoring unit is connected with a control unit of the aeration system and transmits the dissolved oxygen data to the control unit;
the aeration system adjusts the aeration rate of the aerobic reactor based on the dissolved oxygen data.
Optionally, the aeration system comprises a fan, an aerator pipe and an aerator;
the aeration pipe is connected with the fan and the aerator, the aerator is arranged at the bottom of the aerobic reactor, and the aeration pipe is provided with an aeration regulating valve and a gas flowmeter.
Optionally, the sedimentation tank is provided with a sludge discharge system, the sludge discharge system comprises a sludge discharge pump and a sludge discharge pipe, the sludge discharge pump is connected with a sludge discharge port of the sedimentation tank through the sludge discharge pipe, and a sludge discharge valve is arranged on the sludge discharge pipe.
Optionally, the anaerobic reactor, the first anoxic reactor and the second anoxic reactor are all provided with stirring equipment.
In a second aspect, the present application further provides a method for advanced nitrogen removal treatment of high ammonia nitrogen sewage, which utilizes any one of the above devices for advanced nitrogen removal treatment of high ammonia nitrogen sewage, and the method comprises the following steps:
the raw water tank conveys raw water to be treated to the anaerobic reactor, so that the raw water is mixed with sludge which flows back to the anaerobic reactor through the sludge external reflux system to carry out COD absorption and phosphorus release reactions;
the effluent of the anaerobic reactor flows into a first anoxic reactor and is mixed with nitrifying liquid which flows back into the first anoxic reactor through the internal reflux system and raw water which is conveyed by the raw water pool through the second water inlet pipeline, and the raw water provides a carbon source for denitrification reaction in the anoxic reactor;
the water discharged from the first anoxic reactor flows to the aerobic reactor for nitration and phosphorus absorption reaction, and part of the nitration liquid generated at the tail end of the aerobic reactor flows back to the first anoxic reactor through the internal reflux system;
the effluent of the aerobic reactor flows to a second anoxic reactor for denitrification and dephosphorization reactions, and the sludge which flows back to the second anoxic reactor through the sludge external reflux system provides an internal carbon source for the denitrification reaction;
and the effluent of the second anoxic reactor flows to the sedimentation tank, and after mud-water separation in the sedimentation tank, part of the bottom sludge flows back to the front end of the anaerobic reactor and the front end of the second anoxic reactor through an external sludge return system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic view of an apparatus for advanced denitrification treatment of high ammonia nitrogen wastewater in this embodiment.
Icon: 1-an anaerobic reactor; 2-a first anoxic reactor; 3-an aerobic reactor; 4-a second anoxic reactor; 6-a sedimentation tank; 7-internal reflux system; 8-sludge external reflux system; 9-a raw water pool; 10-a control unit; 31-a fan; 32-an aerator pipe; 33-an aerator; 34-aeration regulating valve; 35-a gas flow meter; 36-dissolved oxygen monitoring unit; 61-a dredge pump; 62-a sludge discharge pipe; 63-a mud valve; 71-internal reflux pump; 72-internal reflux adjusting valve; 73-internal reflux flow meter; 81-a first sludge return line; 82-a second sludge return line; 83-sludge reflux pump; 84-sludge reflux flow meter; 85-sludge reflux adjusting valve; 91-a first water inlet line; 92-a second water inlet line; 93-a water inlet pump; 94-first inlet regulating valve; 95-a first water inlet flow meter; 96-a second inlet regulating valve; 97-second water inflow meter.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present application, it is to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, refer to the orientation or positional relationship as shown in the drawings, or as conventionally placed in use of the product of the application, or as conventionally understood by those skilled in the art, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present application.
In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The technical solution in the present application will be described below with reference to the accompanying drawings.
The embodiment provides a high ammonia nitrogen sewage advanced nitrogen treatment device, which can effectively control the cost of sewage treatment and improve the sewage treatment efficiency.
Referring to fig. 1, fig. 1 is a schematic view of an advanced denitrification treatment device for high ammonia nitrogen wastewater in this embodiment.
The advanced denitrification treatment device for high ammonia nitrogen sewage comprises a raw water tank 9, an anaerobic reactor 1, a first anoxic reactor 2, an aerobic reactor 3, a second anoxic reactor 4 and a sedimentation tank 6 which are connected in sequence.
The raw water tank 9 is provided with a second water inlet pipeline 92, and the raw water tank 9 is connected with the first anoxic reactor 2 through the second water inlet pipeline 92 and is used for providing an internal carbon source for the denitrification reaction in the first anoxic reactor 2.
The aerobic reactor 3 and the first anoxic reactor 2 are connected through an internal reflux system 7, a water inlet end of the internal reflux system 7 is positioned at the tail end of the aerobic reactor 3, and a water outlet end of the internal reflux system 7 is positioned at the front end of the first anoxic reactor 2.
The sedimentation tank 6 is provided with a sludge external reflux system 8, and a sludge discharge port of the sedimentation tank 6 is respectively connected with the front end of the second anoxic reactor 4 and the front end of the anaerobic reactor 1 through the sludge external reflux system 8.
In the above process, the flow path of the raw water (i.e. the sewage) can be regarded as that the raw water is introduced into the anaerobic reactor 1 from the raw water tank 9, passes through the first anoxic reactor 2, the aerobic reactor 3 and the second anoxic reactor 4 in sequence, and finally enters the sedimentation tank 6. Wherein, the sedimentation tank 6 returns part of the sludge to the anaerobic reactor 1 and the second anoxic reactor 4 through the sludge external return system 8. The aerobic reactor 3 will return the nitrified liquid generated in the reaction to the first anoxic reactor 2 through the internal return system 7. Meanwhile, the raw water tank 9 directly supplies raw water to the first anoxic reactor 2 through the second water inlet line 92.
The anaerobic reactor 1 is mainly used for releasing phosphorus, and raw water is mixed with return sludge containing phosphorus discharged from the sedimentation tank 6 in the anaerobic reactor 1 to perform a Chemical Oxygen Demand (COD) absorption reaction and a phosphorus release reaction.
The first anoxic reactor 2 is mainly used for denitrification, effluent of the anaerobic reactor 1, nitrified liquid flowing back from the aerobic reactor 3 and raw water conveyed by the raw water pool 9 are subjected to denitrification in the first anoxic reactor 2, and the raw water provides a carbon source, so that the additional carbon source is not required to be provided, and the operation cost of sewage treatment can be effectively reduced; meanwhile, when raw water containing high nitrogen and mainly aiming at denitrification is treated, more carbon sources in the raw water can be used for denitrification through the second water inlet pipeline 92.
The effluent of the first anoxic reactor 2 flows into the aerobic reactor 3, the aerobic reactor 3 is used for nitration and phosphorus absorption reaction to remove ammonia nitrogen and phosphorus in the effluent of the first anoxic reactor 2, and part of the nitration liquid at the tail end of the aerobic reactor 3 flows back to the first anoxic reactor 2 through the internal reflux system 7.
The effluent of the aerobic reactor 3 is subjected to denitrification reaction in the second anoxic reactor 4 to further denitrify, and simultaneously, the carbon source required by the denitrification reaction is provided by the sludge of the sedimentation tank 6 through the sludge external reflux system 8, so that no additional carbon source is required, the running cost of sewage treatment can be effectively reduced, and the denitrification effect can be effectively improved by arranging the second anoxic reactor 4.
And (3) discharging water from the second anoxic reactor 4 to a sedimentation tank 6, separating mud and water, discharging supernatant, returning a part of bottom sludge to the front end of the anaerobic reactor 1, returning a part of bottom sludge to the front end of the second anoxic reactor 4, and discharging residual sludge. It should be noted that TP (total phosphorus), TN (total nitrogen), COD and NH of the discharged supernatant are treated section by the anaerobic reactor 1, the first anoxic reactor 2, the aerobic reactor 3 and the second anoxic reactor 44 +N is the value of ammonium nitrogen, so that the effluent quality of the sewage treated by the sewage deep denitrification treatment device meets the discharge requirement.
In the present disclosure, the raw water tank 9 is configured with a first water inlet pipeline 91, the first water inlet pipeline 91 is connected with the anaerobic reactor 1, and a first flow rate adjusting unit is arranged on the first water inlet pipeline 91. The second water inlet line 92 is provided with a second flow rate adjusting unit. The raw water in the raw water tank 9 is supplied to the first water inlet pipe 91 and the second water inlet pipe 92 by the water inlet pump 93.
The first flow rate adjusting unit includes a first intake water adjusting valve 94 and a first intake water flow meter 95; the flow rate of the raw water introduced into the anaerobic reactor 1 can be adjusted by the first water inlet adjusting valve 94.
The second flow regulating unit comprises a second water inlet regulating valve 96 and a second water inlet flow meter 97, and the flow of the raw water introduced into the first anoxic reactor 2 can be regulated through the second water inlet regulating valve 96. Or, the feed amount of the raw water to the anaerobic reactor 1 and the first anoxic reactor 2 is distributed by adjusting the first feed adjusting valve 94 and the second feed adjusting valve 96.
In the present disclosure, the external sludge recirculation system 8 includes a first sludge recirculation line 81 and a second sludge recirculation line 82 which are independent of each other, the first sludge recirculation line 81 connects the front end of the anaerobic reactor 1 and the sedimentation tank 6, and the second sludge recirculation line 82 connects the front end of the second anoxic reactor 4 and the sedimentation tank 6. The first sludge return line 81 and the second sludge return line 82 are each provided with a sludge flow rate adjusting unit. The sludge flow rate adjusting unit may include a sludge return adjusting valve 85, a sludge return flow meter 84, and a sludge return pump 83. The amount of sludge returned to the anaerobic reactor 1 is regulated by a sludge return regulating valve 85 or a sludge return pump 83 on the first sludge return pipeline 81; the amount of sludge to be returned to the first anoxic reactor 2 is regulated by a sludge return regulating valve 85 or a sludge return pump 83 on the second sludge return line 82. It should be noted that, the sedimentation tank 6 is provided with a sludge discharge system, the sludge discharge system includes a sludge discharge pump 61 and a sludge discharge pipe 62, the sludge discharge pump 61 is connected with the sludge discharge port of the sedimentation tank 6 through the sludge discharge pipe 62, the sludge discharge pipe 62 is provided with a sludge discharge valve 63, the sludge discharge pump 61 and the sludge discharge valve 63 are periodically opened, and residual sludge in the sedimentation tank 6 is discharged.
In the present disclosure, the aerobic reactor 3 is provided with an aeration system for aerating the aerobic reactor 3. The aerobic reactor 3 is provided with a dissolved oxygen monitoring unit 36 (e.g., a DO on-line monitor) for obtaining dissolved oxygen data (DO concentration) of the aerobic reactor 3. The dissolved oxygen monitoring unit 36 is connected to the control unit 10 (e.g., PLC) of the aeration system and transmits dissolved oxygen data to the control unit 10. The aeration system adjusts the aeration rate of the aerobic reactor 3 based on the dissolved oxygen data. The aerobic reactor 3 is aerated by the aeration system to adjust the DO concentration in the aerobic reactor 3.
In the present disclosure, the aeration system includes a blower 31, an aeration pipe 32, and an aerator 33. The aeration pipe 32 is connected with the fan 31 and the aerator 33, the aerator 33 is arranged at the bottom of the aerobic reactor 3, the aeration pipe 32 is provided with an aeration regulating valve 34 and a gas flowmeter 35, and the output power of the fan 31 is regulated or the aeration regulating valve 34 is regulated to regulate the air volume.
In the present disclosure, the anaerobic reactor 1, the first anoxic reactor 2, and the second anoxic reactor 4 are all provided with stirring equipment. In the anaerobic reactor 1, the first anoxic reactor 2 and the second anoxic reactor 4, the reaction generated in the anaerobic reactor 1, the first anoxic reactor 2 and the second anoxic reactor 4 can be more sufficient through the stirring equipment, and the treatment effect of the sewage is ensured.
It should be noted that the present disclosure also provides a high ammonia nitrogen sewage deep denitrification treatment method, which utilizes the above described high ammonia nitrogen sewage deep denitrification treatment device, and the method comprises the following steps:
starting a water inlet pump 93, conveying raw water to be treated to the anaerobic reactor 1 by the raw water tank 9, and adjusting the water inlet flow rate by a first water inlet adjusting valve 94;
in the anaerobic reactor 1, raw water is mixed with sludge which flows back to the anaerobic reactor 1 through a sludge external reflux system 8 and is stirred through stirring equipment to carry out COD absorption and phosphorus release reactions;
the effluent of the anaerobic reactor 1 flows into the first anoxic reactor 2, and is mixed with the nitrifying liquid which flows back into the first anoxic reactor 2 through the internal reflux system 7 and the raw water which is conveyed by the raw water pool 9 through the second water inlet pipeline 92 and is stirred through the stirring equipment to carry out denitrification reaction, wherein the raw water provides a carbon source for the denitrification reaction carried out in the anaerobic reactor 1;
the water discharged from the first anoxic reactor 2 flows to the aerobic reactor 3, the fan 31 is started to aerate the aerobic reactor 3, and the sewage is nitrified and subjected to phosphorus absorption reaction. The PLC adjusts the air volume controlled by the fan 31 or the aeration adjusting valve 34 according to the dissolved oxygen data fed back by the dissolved oxygen monitoring unit 36 of the aerobic reactor 3 to adjust the DO concentration, it should be noted that, in a preferred case, the dissolved oxygen monitoring unit 36 can monitor a plurality of positions of the aerobic reactor 3, and the aeration volume is adjusted by the PLC controller, so that the DO concentration at the front end of the aerobic reactor 3 is 0.3-1mg/L, and the DO concentration at the rear end of the aerobic reactor 3 is 0.5-3 mg/L. Part of nitrified liquid generated at the tail end of the aerobic reactor 3 flows back to the first anoxic reactor 2 through the internal reflux system 7, and the internal reflux amount of the nitrified liquid is regulated through an internal reflux pump 71 or an internal reflux regulating valve 72 of the internal reflux system 7 (the internal reflux system 7 is also provided with an internal reflux flowmeter 73); it is noted that, in a preferable case, the internal reflux ratio of the aerobic reactor 3 to the first anoxic reactor 2 is 100 to 200%.
The effluent of the aerobic reactor 3 flows to a second anoxic reactor 4 for denitrification and dephosphorization reactions, and the sludge which flows back to the second anoxic reactor 4 through a sludge external reflux system 8 provides an internal carbon source for the denitrification reactions;
the second anoxic reactor 4 discharges water to a sedimentation tank 6, supernatant is discharged after mud-water separation in the sedimentation tank 6, part of bottom sludge flows back to the front end of the anaerobic reactor 1 through a sludge external reflux system 8 and flows back to the front end of the second anoxic reactor 4, and the amount of sludge flowing back to the anaerobic tank 1 is regulated through a corresponding sludge reflux pump 83 or a sludge reflux regulating valve 85; the amount of sludge flowing back to the first anoxic reactor 2 is regulated by the corresponding sludge return pump 83 or sludge return regulating valve 85, and the sludge discharge pump 61 and the sludge discharge valve 63 are periodically opened to discharge excess sludge. It should be noted that, in a preferable case, the first sludge reflux ratio of the sedimentation tank 6 to the anaerobic reactor 1 is 50% to 100%; the reflux ratio of the second sludge from the sedimentation tank 6 to the second anoxic reactor 4 is 50-150%.
An embodiment will be provided below based on the above processing method:
in the embodiment, the hydraulic retention time of the anaerobic reactor 1 is 1h, the hydraulic retention time of the first anoxic reactor 2 is 2.5h, the hydraulic retention time of the aerobic reactor 3 is 5h, and the hydraulic retention time of the second anoxic reactor 4 is 3 h; the total water inflow is Q, the flow of the first water inlet pipeline 91 is 50 percent Q, the flow of the second water inlet pipeline 92 is 50 percent Q, the internal reflux of the aerobic reactor 3 back to the first anoxic reactor 2 is 100 percent, the sedimentation tank 6 returns to the first sludge reflux ratio of the anaerobic reactor 1 is 100 percent, and the second sludge reflux ratio of the second anoxic reactor 4 is 150 percent; controlling the DO concentration at the tail end of the first aerobic reactor 3 to be 2 mg/L; MLSS (sludge concentration) of the anaerobic reactor 1 is 4600-7300 mg/L; MLSS (sludge concentration) of the first anoxic reactor 2 and the first aerobic reactor 3 is 3500-5500 mg/L, and MLSS (sludge concentration) of the second anoxic reactor 4 and the second aerobic reactor 3 is 5000-7800 mg/L. Under the conditions, the water quality data of treated inlet water and treated outlet water are shown in the following table (the unit is mg/L).
| COD | TN | TP | NH4 +-N | |
| Inflow water | 220 | 40 | 7 | 37 |
| Discharging water | 25 | 8 | 0.38 | 0.9 |
The data in the table show that the effluent quality is superior to the first-class A discharge standard.
Therefore, compared with the prior art, the advanced denitrification treatment device and method for high ammonia nitrogen sewage provided by the disclosure can realize a more efficient sewage treatment effect with lower cost.
The present disclosure has at least the following advantages:
(1) compared with the traditional A2O process, the method has the advantages that the second anoxic reactor is arranged, the nitrified liquid which does not flow back to the first anoxic reactor is further denitrified in the second anoxic reactor, and the denitrification efficiency is high;
(2) the invention is provided with sludge double return (a first sludge return pipeline and a second sludge return pipeline), the sludge returns to the second anoxic reactor, denitrifying bacteria utilizes the internal carbon source in the sludge for denitrification in the second anoxic reactor, the self-resources of a sewage plant are fully utilized, and no external carbon source is needed;
(3) the invention utilizes the carbon source in the sludge for denitrification, is beneficial to sludge reduction and saves the sludge treatment cost.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The advanced denitrification treatment device for the high ammonia nitrogen sewage is characterized by comprising a raw water tank, an anaerobic reactor, a first anoxic reactor, an aerobic reactor, a second anoxic reactor and a sedimentation tank which are sequentially connected;
the raw water tank is provided with a second water inlet pipeline, is connected with the first anoxic reactor through the second water inlet pipeline and is used for providing a carbon source for denitrification reaction in the first anoxic reactor;
the aerobic reactor and the first anoxic reactor are connected through an internal reflux system, the water inlet end of the internal reflux system is positioned at the tail end of the aerobic reactor, and the water outlet end of the internal reflux system is positioned at the front end of the first anoxic reactor;
the sedimentation tank is provided with an external sludge reflux system, and a sludge discharge port of the sedimentation tank is respectively connected with the front end of the second anoxic reactor and the front end of the anaerobic reactor through the external sludge reflux system.
2. The advanced denitrification treatment device for high ammonia nitrogen wastewater according to claim 1,
the raw water pool is provided with a first water inlet pipeline, the first water inlet pipeline is connected with the anaerobic reactor, and a first flow regulating unit is arranged on the first water inlet pipeline;
the second water inlet pipeline is provided with a second flow regulating unit.
3. The advanced denitrification treatment device for high ammonia nitrogen wastewater as set forth in claim 2,
the first flow regulating unit comprises a first water inlet regulating valve and a first water inlet flow meter;
the second flow regulating unit comprises a second water inlet regulating valve and a second water inlet flow meter.
4. The advanced denitrification treatment device for high ammonia nitrogen wastewater as set forth in claim 2,
the sludge external reflux system comprises a first sludge reflux pipeline and a second sludge reflux pipeline which are mutually independent, the first sludge reflux pipeline is connected with the front end of the anaerobic reactor and the sedimentation tank, and the second sludge reflux pipeline is connected with the front end of the second anoxic reactor and the sedimentation tank;
the first sludge return pipeline and the second sludge return pipeline are both provided with sludge flow regulating units.
5. The advanced denitrification treatment device for high ammonia nitrogen wastewater according to claim 1,
the aerobic reactor is provided with an aeration system for aerating the aerobic reactor.
6. The advanced denitrification treatment device for high ammonia nitrogen wastewater as set forth in claim 5,
the aerobic reactor is provided with a dissolved oxygen monitoring unit and is used for acquiring dissolved oxygen data of the aerobic reactor;
the dissolved oxygen monitoring unit is connected with a control unit of the aeration system and transmits the dissolved oxygen data to the control unit;
the aeration system adjusts the aeration rate of the aerobic reactor based on the dissolved oxygen data.
7. The advanced denitrification treatment device for high ammonia nitrogen wastewater as set forth in claim 5,
the aeration system comprises a fan, an aeration pipe and an aerator;
the aeration pipe is connected with the fan and the aerator, the aerator is arranged at the bottom of the aerobic reactor, and the aeration pipe is provided with an aeration regulating valve and a gas flowmeter.
8. The advanced denitrification treatment device for high ammonia nitrogen wastewater as set forth in claim 5,
the sedimentation tank is provided with a sludge discharge system, the sludge discharge system comprises a sludge discharge pump and a sludge discharge pipe, the sludge discharge pump is connected with a sludge discharge port of the sedimentation tank through the sludge discharge pipe, and a sludge discharge valve is arranged on the sludge discharge pipe.
9. The advanced denitrification treatment device for high ammonia nitrogen wastewater according to claim 1,
the anaerobic reactor, the first anoxic reactor and the second anoxic reactor are all provided with stirring equipment.
10. A method for advanced nitrogen removal treatment of high ammonia nitrogen sewage, which is characterized by using the advanced nitrogen removal treatment device of high ammonia nitrogen sewage of any one of claims 1 to 9, and comprises the following steps:
the raw water tank conveys raw water to be treated to the anaerobic reactor, so that the raw water is mixed with sludge which flows back to the anaerobic reactor through the sludge external reflux system to carry out COD absorption and phosphorus release reactions;
the effluent of the anaerobic reactor flows into a first anoxic reactor and is mixed with nitrifying liquid which flows back into the first anoxic reactor through the internal reflux system and raw water which is conveyed by the raw water tank through the second water inlet pipeline, and the raw water provides a carbon source for denitrification reaction in the anaerobic reactor;
the water discharged from the first anoxic reactor flows to the aerobic reactor for nitration and phosphorus absorption reaction, and part of the nitration liquid generated at the tail end of the aerobic reactor flows back to the first anoxic reactor through the internal reflux system;
the effluent of the aerobic reactor flows to a second anoxic reactor for denitrification and dephosphorization reactions, and the sludge which flows back to the second anoxic reactor through the sludge external reflux system provides an internal carbon source for the denitrification reaction;
and the effluent of the second anoxic reactor flows to the sedimentation tank, and after mud-water separation in the sedimentation tank, part of the bottom sludge flows back to the front end of the anaerobic reactor and the front end of the second anoxic reactor through an external sludge return system.
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| CN202110859377.2A CN113443713A (en) | 2021-07-28 | 2021-07-28 | Device and method for advanced denitrification treatment of high ammonia nitrogen sewage |
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