CN217921623U - Back-driving type continuous flow aerobic granular sludge enhanced denitrification system - Google Patents
Back-driving type continuous flow aerobic granular sludge enhanced denitrification system Download PDFInfo
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- CN217921623U CN217921623U CN202221714629.9U CN202221714629U CN217921623U CN 217921623 U CN217921623 U CN 217921623U CN 202221714629 U CN202221714629 U CN 202221714629U CN 217921623 U CN217921623 U CN 217921623U
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Abstract
The utility model discloses a denitrogenation system is reinforceed to good oxygen granule mud of back drive type continuous flow, including little oxygen pond and good oxygen pond, be equipped with the selection in the good oxygen pond and deposit the device, have the function of screening granule mud and eliminating flocculent mud. The system increases the number of the selective sedimentation devices in the aerobic tank in the starting stage so as to improve the shearing force and promote the granulation of the sludge, the granular sludge forms an outer aerobic and inner anoxic/anaerobic microenvironment in the micro-aerobic tank, and a synchronous nitrification and denitrification process occurs, so that the process is a process with granulation driving behind and enhanced denitrification ahead. The utility model can strengthen the biological denitrification performance, and the effluent quality is better; the sludge settling performance is good, the sludge concentration of the system is higher, and the sewage treatment capacity is increased; a secondary sedimentation tank is omitted, so that the occupied area is saved; the return flow of the nitrifying liquid is saved, and an external carbon source is not needed, so that the energy consumption is further saved; the method can be realized by properly modifying the existing structures of the sewage treatment plant, has low capital investment and is beneficial to the upgrading modification of the existing sewage treatment plant.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, particularly, relate to a back drive type continuous flow good oxygen granule mud intensification denitrogenation system.
Background
With the acceleration of urbanization, the pressure of huge population and land resources is forcing municipal sewage treatment plants to increase their treatment capacity in a limited area. Meanwhile, the requirements of people on the environmental quality are higher and higher, and stricter pollutant discharge standards are adopted in various places, but the existing traditional activated sludge treatment process is difficult to meet the requirements, especially the removal of nutrients, so that the upgrading of the sewage treatment process is imperative.
The aerobic granular sludge is a special biological film, the grain diameter is generally larger than 0.2mm, the sedimentation speed is 10-15 times of that of the traditional flocculent sludge, and the aerobic granular sludge has the characteristics of high sedimentation speed, high sludge concentration and capability of synchronously removing carbon, nitrogen and phosphorus, and is called one of the sewage biological treatment technologies with the most development potential in the 21 st century. At present, research and application of aerobic granular sludge are mainly concentrated on a sequencing batch reactor, but the sequencing batch aerobic granular sludge reactor is complex in operation control and only suitable for treating a scene with small water amount, and a continuous flow type aerobic granular sludge process is easier to operate and control, can be realized by properly modifying the existing structures of a sewage treatment plant, and has great application prospect.
SUMMERY OF THE UTILITY MODEL
The utility model provides a denitrogenation system is reinforceed to driven continuous flow good oxygen granule mud in back solves the reactor operational control that exists among the prior art complicacy, the processing water yield is little and denitrogenation inefficiency and unable continuous operation scheduling problem, realizes simplifying process flow, guarantees out water quality of water yield and mesh such as intensive biological denitrification effect.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
a rear-drive continuous flow aerobic granular sludge enhanced denitrification system comprises a micro-aerobic tank and an aerobic tank, wherein the bottom of the micro-aerobic tank is communicated with the bottom of the aerobic tank;
the micro-aerobic tank comprises a micro-aerobic tank body, a water distribution channel, water distribution pipes and an aeration device, wherein the water distribution channel is arranged at the upper part of one side in the micro-aerobic tank body and is provided with the water distribution pipes; the water distribution pipe extends to the bottom of the micro-aerobic tank body;
the aerobic tank comprises an aerobic tank body, a selective sedimentation device, an aeration device and a sludge return line, wherein the selective sedimentation device is uniformly arranged on the upper part of the aerobic tank body and used for screening granular sludge and eliminating flocculent sludge, an aerobic granular sludge sedimentation zone and a flocculent sludge sedimentation zone are arranged in the selective sedimentation device, the aerobic granular sludge sedimentation zone can sediment aerobic granular sludge with good performance, the aerobic granular sludge sedimentation zone is provided with an inlet of the selective sedimentation device, and the bottom of the aerobic granular sludge sedimentation zone is provided with an outlet of the sedimentation zone.
The aerobic granular sludge settling zone is provided with a primary settling zone and a secondary settling zone, large granular sludge with good settling property in the primary settling zone is rapidly settled, the mixed liquid of un-settled sludge and sewage flows into the secondary settling zone from the top, and small granular sludge with good settling property is settled in the secondary settling zone.
The bottoms of the first-stage settling zone and the second-stage settling zone are conical.
The outlet of the sedimentation zone is provided with a primary sedimentation zone outlet and a secondary sedimentation zone outlet, and the aerobic granular sludge enters the aerobic tank through the primary sedimentation zone outlet and the secondary sedimentation zone outlet.
And sludge return pipelines are arranged at the outlets of the primary sedimentation zone and the secondary sedimentation zone and can return granular sludge to the micro-aerobic tank.
The bottom of the flocculent sludge settling area is in a closed conical shape and is provided with a sludge discharge pipe, and settled flocculent sludge is discharged out of the system in a form of excess sludge.
The aeration device is respectively arranged at the bottom of the micro-aerobic tank body and the bottom of the aerobic tank body.
The return flow of the sludge return pipeline is 1-2 times of the water inflow.
The concentration of dissolved oxygen in the micro-oxygen pool is less than 0.5mg/L, and the concentration of dissolved oxygen in the aerobic pool is controlled to be 0.5-5.0 mg/L.
The utility model discloses a back drive type continuous flow aerobic granular sludge enhanced denitrification system has following characteristics and beneficial effect:
the utility model increases the number of selective sedimentation devices in the starting stage, and forms a high shearing force condition in the aerobic tank, thereby promoting the granulation of the activated sludge; the granular sludge is screened out by selecting the sedimentation device, and the flocculent sludge is eliminated, so that the aerobic granular sludge ratio of the system is improved, and finally a continuous flow aerobic granular sludge system with high granulation ratio is formed;
under the condition of weak aeration of the micro-aerobic tank, the granular sludge forms an outer aerobic and inner anoxic/anaerobic microenvironment, so that the synchronous nitrification and denitrification reaction process can be accelerated, and the biological denitrification is enhanced.
Compared with the existing activated sludge process, the utility model can strengthen the synchronous nitrification and denitrification nitrogen removal, and the effluent quality is better; the sedimentation performance of the granular sludge is better, the sludge concentration of the system is higher, and the sewage treatment capacity is increased; a secondary sedimentation tank is omitted, so that the occupied area is saved; the return flow of the nitrifying liquid is saved, and an external carbon source is not needed, so that the energy consumption is further saved; and the method can be realized after the existing structures of the sewage treatment plant are properly modified, the capital investment is low, and the market application prospect is good.
Drawings
FIG. 1 is a schematic diagram of a rear-drive continuous flow aerobic granular sludge system according to an embodiment of the present invention;
fig. 2 is a schematic top view of a rear driving type continuous flow aerobic granular sludge system according to an embodiment of the present invention.
The reference numbers in the figures: the aerobic tank comprises a micro-oxygen tank body 1, an aerobic tank body 2, a selective sedimentation device 3, a water distribution channel 4, a water distribution pipe 5, an aeration device 6, a primary sedimentation zone 7, a secondary sedimentation zone 8, a flocculent sludge sedimentation zone 9, a sludge return pipeline 10, an air stripping device 11, a selective sedimentation device inlet 12, a primary sedimentation zone outlet 13, a secondary sedimentation zone outlet 14, a sludge discharge pipe 15 and a water outlet channel 16.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, the utility model relates to a rear-driving continuous flow aerobic granular sludge enhanced denitrification system, which comprises a micro-aerobic tank and an aerobic tank, wherein the bottom of the micro-aerobic tank is communicated with the bottom of the aerobic tank;
the micro-oxygen pond comprises a micro-oxygen pond body 1, a water distribution channel 4, a water distribution pipe 5 and an aeration device 6, wherein the water distribution channel 4 is arranged at the upper part of one side in the micro-oxygen pond body 1 and is provided with the water distribution pipe 5; the water distribution pipe 5 extends to the bottom of the micro-aerobic tank body 1;
the aerobic tank comprises an aerobic tank body 2, a selective sedimentation device 3, an aeration device 6 and a sludge return line 10, wherein the selective sedimentation device 3 is uniformly arranged on the upper part of the aerobic tank body 2 and used for screening granular sludge and eliminating flocculent sludge, an aerobic granular sludge sedimentation zone and a flocculent sludge sedimentation zone 9 are arranged in the selective sedimentation device 3, the aerobic granular sludge sedimentation zone can sediment aerobic granular sludge with good performance, and a sedimentation zone outlet is arranged at the bottom of the aerobic granular sludge sedimentation zone.
The aerobic granular sludge settling zone is provided with a primary settling zone 7 and a secondary settling zone 8, large granular sludge with good settling property in the primary settling zone 7 settles rapidly, un-settled sludge and sewage mixed liquor flow into the secondary settling zone 8 from the top, and small granular sludge with good settling property settles in the secondary settling zone 8.
The bottoms of the primary settling zone 7 and the secondary settling zone 8 can be designed to be conical, and the conical side walls of the primary settling zone 7 are respectively provided with an inlet 12 of a selective settling device.
The outlet of the sedimentation zone comprises a primary sedimentation zone outlet 13 and a secondary sedimentation zone outlet 14 which are respectively arranged at the bottoms of the primary sedimentation zone 7 and the secondary sedimentation zone 8, and the settled aerobic granular sludge returns to the aerobic tank through the primary sedimentation zone outlet 13 and the secondary sedimentation zone outlet 14.
The outlet of the sedimentation zone is provided with a primary sedimentation zone outlet 13 and a secondary sedimentation zone outlet 14, and the aerobic granular sludge enters the aerobic tank through the primary sedimentation zone outlet 13 and the secondary sedimentation zone outlet 14.
And sludge return pipelines 10 are arranged at the outlets 13 and 14 of the primary sedimentation zone and the secondary sedimentation zone and can return granular sludge to the micro-aerobic tank, and an air stripping device 11 is arranged on the sludge return pipelines 10.
The aeration device 6 is respectively arranged at the bottom of the micro-aerobic tank body 1 and the bottom of the aerobic tank body 2.
A sludge discharge pipe 15 is arranged in the flocculent sludge settling zone 9, and flocculent sludge is selected to be eliminated while residual sludge is discharged; an outlet channel 16 is also provided.
A post-drive continuous flow aerobic granular sludge enhanced denitrification process comprises the following steps:
inoculating activated sludge to ensure that the sludge concentration (calculated by mixed liquor suspended solid concentration MLSS) of a micro-aerobic tank body 1 and an aerobic tank body 2 is 2-4 g/L;
step two, sewage enters the micro-aerobic tank body 1 through the water distribution channel 4 and the water distribution pipe 5, and under the condition of weak aeration of the micro-aerobic tank, granular sludge forms an aerobic micro-environment on the outer layer and an anoxic/anaerobic micro-environment on the inner layer to perform synchronous nitrification-denitrification reaction;
step three, the sludge-water mixed liquid of the micro-aerobic tank after the micro-aerobic tank reaction is finished enters an aerobic tank through a bottom channel, and residual organic matters and ammonia nitrogen are removed under the strong aeration condition of the aerobic tank;
step four, the sludge-water mixed liquor of the aerobic tank after the reaction of the aerobic tank enters a primary sedimentation zone 7 through an inlet 12 of a selective sedimentation device, large-particle sludge with good sedimentation performance in the primary sedimentation zone 7 is quickly settled, and the un-settled sludge and the mixed liquor flow into a secondary sedimentation zone 8 from the top; in the secondary sedimentation zone 8, the small-particle sludge with better sedimentation performance is sedimented, and the sedimented particle sludge returns to the aerobic tank body 2 through a primary sedimentation zone outlet 13 and a secondary sedimentation zone outlet 14 to form the internal circulation of the aerobic tank of the aerobic particle sludge; the sludge return pipeline 10 arranged at the outlet 13 of the first-stage sedimentation zone and the outlet 14 of the second-stage sedimentation zone returns the aerobic granular sludge to the water distribution channel 4 of the micro-aerobic tank, and the aerobic granular sludge is mixed with sewage in the water distribution channel 4 and then flows back to the micro-aerobic tank body 1 through the water distribution pipe 5, so that the purposes of system circulation and continuous and stable operation are achieved; the mixed liquid of the un-settled sludge and the sewage flows into the flocculent sludge settling zone 9 from the top, in the flocculent sludge settling zone 9, the settled flocculent sludge is discharged out of the system in the form of excess sludge through a sludge discharge pipe 15, and the effluent enters the next treatment unit through an effluent channel 16.
The sewage can realize uniform water distribution through the water distribution channel 4 and the water distribution pipe 5, so that the system has stronger impact load resistance.
And in the fourth step, the reflux quantity of the reflux pipeline is 1-2 times of the water inflow.
The concentration of dissolved oxygen in the micro-oxygen pool is less than 0.5mg/L, and the concentration of dissolved oxygen in the aerobic pool is controlled to be 0.5-5.0 mg/L.
The aeration devices 6 are uniformly distributed at the bottom of the aerobic tank body 2, so that the sewage and the sludge in the aerobic tank are uniformly mixed, and oxygen is provided for further oxidizing the residual organic matters and ammonia nitrogen.
At the initial stage of starting, set up the selection sediment device that the quantity is more in the aerobic tank, reduce the sediment load on the one hand, help the sludge concentration of stable system, on the other hand more sediment devices can reduce aerobic tank upper portion cross section and volume, and the collision shearing force between the bubble shearing force that the mud received in the increase aerobic tank and mud accelerates the miniaturation of mud. After the system is started, part of the selective precipitation device is removed for reuse, so that the capital investment can be saved. The process realizes the organic combination of the biochemical tank and the sedimentation tank, namely, the traditional secondary sedimentation tank is omitted, the floor area is saved, the return flow of the nitrifying liquid is omitted, and the energy consumption is saved during operation.
To sum up, the utility model discloses a back drive type continuous flow aerobic granule mud enhanced nitrogen removal system, in the microaerobic pond, suitable aeration intensity makes granule mud form outer good oxygen, inlayer oxygen deficiency/anaerobic microenvironment, nitrobacteria utilizes oxygen to oxidize ammonia nitrogen into nitrite nitrogen/nitrate nitrogen in the outer strata, and the nitrite nitrogen/nitrate nitrogen that generates uses the organic matter in the sewage as the carbon source and is reduced into nitrogen gas under inlayer oxygen deficiency/anaerobic condition to realize synchronous nitrification denitrification denitrogenation; in an aerobic tank, sludge is accelerated to granulate under the action of huge bubble shear force and collision shear force between the sludge, formed granular sludge is retained by a selective precipitation device, part of the granular sludge is refluxed to a micro-aerobic tank, the rest of the granular sludge is self-refluxed to the aerobic tank through an outlet of the selective precipitation device to form internal circulation, flocculent sludge is discharged out of a system in the form of residual sludge, and a high-granulation-ratio aerobic continuous-flow granular sludge system which enhances synchronous nitrification and denitrification and has dynamic balance is finally formed.
The utility model strengthens the synchronous nitrification and denitrification, and has better effluent quality; the sludge settling performance is better, the sludge concentration of the system is higher, and the sewage treatment capacity is increased; a secondary sedimentation tank is omitted, so that the occupied area is saved; the reflux of the nitrifying liquid is saved, and an additional organic carbon source is not needed, so that the energy consumption is further saved; meanwhile, the method can be realized by properly modifying the existing structures of the sewage treatment plant, has low capital investment and is beneficial to the upgrading modification of the existing sewage treatment plant.
The above embodiments are preferred embodiments of the present invention, but not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalent replacements and all fall within the protection scope of the present invention.
Claims (7)
1. A post-driven continuous flow aerobic granular sludge enhanced denitrification system is characterized in that: comprises a micro-aerobic tank and an aerobic tank, wherein the bottom of the micro-aerobic tank is communicated with the bottom of the aerobic tank;
the micro-aerobic tank comprises a micro-aerobic tank body (1), a water distribution channel (4), water distribution pipes (5) and an aeration device (6), wherein the water distribution channel (4) is arranged at the upper part of one side in the micro-aerobic tank body (1) and is provided with the water distribution pipes (5); the water distribution pipe (5) extends to the bottom of the micro-aerobic tank body (1);
the aerobic tank comprises an aerobic tank body (2), a selective sedimentation device (3), an aeration device (6) and a sludge return pipeline (10), wherein the selective sedimentation device (3) is uniformly arranged at the upper part of the aerobic tank body (2), an aerobic granular sludge sedimentation region and a flocculent sludge sedimentation region (9) are arranged in the selective sedimentation device (3), the aerobic granular sludge sedimentation region is provided with a selective sedimentation device inlet (12), and a sedimentation region outlet is arranged at the bottom of the aerobic granular sludge sedimentation region;
the concentration of dissolved oxygen in the micro-oxygen pool is controlled to be less than 0.5mg/L, and the concentration of dissolved oxygen in the aerobic pool is controlled to be 0.5-5.0 mg/L.
2. The enhanced denitrification system for the post-driven type continuous flow aerobic granular sludge according to claim 1, wherein: aerobic granule mud sedimentation zone is equipped with one-level sedimentation zone (7) and second grade sedimentation zone (8), and the good large granule mud of settling property subsides rapidly in one-level sedimentation zone (7), and the mixed liquid of mud and the sewage that does not subside flows into second grade sedimentation zone (8) from the top, and in second grade sedimentation zone (8), the fine granule mud of settling property subsides.
3. The post-driven continuous flow aerobic granular sludge enhanced nitrogen removal system as claimed in claim 2, wherein: the bottoms of the primary sedimentation zone (7) and the secondary sedimentation zone (8) are conical.
4. The enhanced denitrification system for the post-driven type continuous flow aerobic granular sludge according to claim 1, wherein: the outlet of the sedimentation zone is provided with a primary sedimentation zone outlet (13) and a secondary sedimentation zone outlet (14), and the settled aerobic granular sludge returns to the aerobic tank through the primary sedimentation zone outlet (13) and the secondary sedimentation zone outlet (14).
5. The post-driven continuous flow aerobic granular sludge enhanced nitrogen removal system as claimed in claim 4, wherein: and sludge return pipelines (10) are arranged at the outlets (13, 14) of the primary sedimentation zone and the secondary sedimentation zone and return granular sludge to the micro-aerobic tank.
6. The enhanced denitrification system for the post-driven type continuous flow aerobic granular sludge according to claim 1, wherein: the bottom of the flocculent sludge settling zone (9) is in a closed cone shape and is provided with a sludge discharge pipe, and settled flocculent sludge is discharged out of the system in the form of residual sludge.
7. The post-driven continuous flow aerobic granular sludge enhanced nitrogen removal system as claimed in claim 1, wherein: the aeration device (6) is respectively arranged at the bottom of the micro-aerobic tank body (1) and the bottom of the aerobic tank body (2).
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| CN115286095A (en) * | 2022-07-05 | 2022-11-04 | 王凯军 | Back-driving type continuous flow aerobic granular sludge enhanced denitrification system and process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115286095A (en) * | 2022-07-05 | 2022-11-04 | 王凯军 | Back-driving type continuous flow aerobic granular sludge enhanced denitrification system and process |
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