An integrated sewage treatment and anaerobic ammonia oxidation bacteria retention system and method

Abstract

The present invention belongs to the technical field of biological treatment of sewage, and discloses an integrated sewage treatment and anaerobic ammonia oxidizing bacteria retention system and method. The system includes a reactor tank body, an inlet subsystem, an outlet subsystem, an aeration subsystem, a biological filler area, a short-range nitrification sludge and an online monitoring subsystem. The method includes: S1: allowing sewage to flow into the bottom of the reactor tank body; S2: using the aeration subsystem to aerate the sewage, and when the ammonia nitrogen concentration of the sewage in the reactor tank body is less than the threshold value, stopping aeration; S3: allowing the short-range nitrification sludge to settle by gravity; when the sedimentation mud level of the short-range nitrification sludge remains unchanged, repeating the water intake process of step S1, and at the same time, the outlet water from the upper part of the reactor tank body is discharged from the system through the outlet subsystem. S4: Repeat the above steps S1-S3 until the sewage meets the discharge standard. The present invention uses a synchronous water inlet and outlet method to retain anaerobic ammonia oxidizing bacteria in the system, thereby solving the problem of bacteria loss.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage biological treatment, and more specifically, relates to an integrated sewage treatment and anaerobic ammonia oxidation bacteria retention system and method. Background Art

[0002] Traditional sewage treatment plants have complex treatment processes and require the addition of large amounts of chemical reagents for chemical phosphorus removal and denitrification. This not only occupies a large area, but also has high chemical and electricity consumption, which does not meet the ecological civilization development requirements of "green, low-carbon, circular, and sustainable production and lifestyle."

[0003] Anaerobic ammonium oxidation (ANAMMOX) is a novel autotrophic denitrification process that can remove nitrogen without an external carbon source. However, ANAMMOX bacteria require up to 11 days to grow, resulting in a relatively low growth rate. During system operation, some bacteria are expelled from the system with floating sludge and sludge discharge. Loss of these bacteria can severely impact treatment effectiveness. Therefore, preventing the loss of ANAMMOX bacteria is crucial for this novel autotrophic denitrification process. Summary of the Invention

[0004] The present invention addresses the shortcomings of existing technologies by providing an integrated wastewater treatment and anaerobic ammonium oxidation (ANAMMOX) bacteria retention system and method. By utilizing a synchronized water inlet and outlet system, ANAMMOX bacteria are retained within the system, addressing the issue of bacterial loss. Simultaneously, the system fully utilizes organic matter in the raw water for biological phosphorus removal and autotrophic deep nitrogen removal via ANAMMOX, achieving both biological phosphorus removal and autotrophic deep nitrogen removal without the need for chemical reagents.

[0005] In order to achieve the above objectives, the present invention provides an integrated sewage treatment and anaerobic ammonia oxidation bacteria retention system, which includes a reactor tank body, an inlet subsystem, an outlet subsystem, an aeration subsystem, a biological filler area, a short-range nitrification sludge and an online monitoring subsystem;

[0006] The water inlet subsystem is arranged at the upper part of the reactor body, and comprises an inner water inlet channel, a first water inlet weir, an outer water inlet channel, a second water inlet weir, a plurality of water inlet risers and a plurality of water distribution horns; the first water inlet weir is arranged between the inner water inlet channel and the outer water inlet channel;

[0007] The water outlet subsystem includes a water outlet weir and a water outlet channel; the water outlet channel is arranged between the water outlet weir and the second water inlet weir, the multiple water inlet risers are all connected to the bottom of the second water inlet weir and pass through the bottom of the water outlet weir, and the multiple water distribution horns are all arranged at the lower part of the reactor tank body and are respectively connected to the lower parts of the multiple water inlet risers;

[0008] The aeration subsystem includes a plurality of aerators and a blower; the blower is arranged outside the reactor body, the plurality of aerators are arranged at the bottom of the reactor body, and the plurality of aerators are connected to the blower through pipelines;

[0009] The biological filler area includes multiple groups of biological filler balls, each group of biological filler balls includes multiple biological filler balls connected in sequence, each of the biological filler balls contains anaerobic ammonia oxidation biofilm filler, and each group of biological filler balls is respectively arranged around each water inlet vertical pipe;

[0010] The short-cut nitrification sludge is arranged in the reactor body;

[0011] The online monitoring subsystem includes a display screen, an online ammonia nitrogen probe and an online dissolved oxygen probe; the online ammonia nitrogen probe and the online dissolved oxygen probe are both connected to the display screen and are both arranged in the reactor tank body.

[0012] Another aspect of the present invention provides a method for integrated sewage treatment and anaerobic ammonia-oxidizing bacteria retention, which method uses the integrated sewage treatment and anaerobic ammonia-oxidizing bacteria retention system, and comprises the following steps:

[0013] S1: allowing sewage to flow into the water inlet channel and flow to the bottom of the reactor tank through the multiple water distribution horns;

[0014] S2: After the water inflow in step S1 is completed, the sewage is aerated using the aeration subsystem, and the sewage in the reactor tank is monitored using the online monitoring subsystem. When the ammonia nitrogen concentration of the sewage in the reactor tank is less than a threshold value, the aeration is stopped;

[0015] S3: allowing the short-cut nitrification sludge to settle by gravity; when the settling mud level of the short-cut nitrification sludge remains unchanged, repeating the water intake process of step S1, while the effluent from the upper part of the reactor tank body is discharged from the system through the effluent subsystem.

[0016] S4: Repeat the above steps S1-S3 until the sewage meets the discharge standard and the treatment is completed.

[0017] The technical solution of the present invention has the following beneficial effects:

[0018] (1) The present invention adopts a sequencing batch biofilm method combined with activated sludge to remove nitrogen and phosphorus, and at the same time changes the decanting process to a synchronous water inlet and outlet method, which saves decanting time.

[0019] (2) The present invention can retain anaerobic ammonia-oxidizing bacteria in the system, solve the problem of anaerobic ammonia-oxidizing bacteria species loss, maintain the abundance of bacteria in the system, and ensure that the reaction proceeds quickly and efficiently.

[0020] (3) The present invention can fully utilize the organic matter in the raw water for biological phosphorus removal when the water enters, without the need for chemical phosphorus removal.

[0021] (4) The present invention is in an anaerobic environment when water is inletted, and denitrification and denitrification are carried out simultaneously with anaerobic phosphorus release, thus eliminating the need for anaerobic stirring time;

[0022] (5) The present invention does not require a secondary sedimentation tank, simplifies the process flow, and saves space.

[0023] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0025] Figure 1 A front view schematic diagram of an integrated sewage treatment and anaerobic ammonia oxidation bacteria retention system provided by the present invention is shown.

[0026] Figure 2 A side view schematic diagram of an integrated sewage treatment and anaerobic ammonia oxidation bacteria retention system provided by the present invention is shown.

[0027] The following are the descriptions of the reference numerals:

[0028] 1 Reactor tank body; 2 Water inlet subsystem; 3 Water outlet subsystem; 4 Aeration subsystem; 2-1 Inner inlet channel; 2-2 First inlet weir; 2-3 Outer inlet channel; 2-4 Inlet riser; 2-5 Water distribution horn; 2-6 Second inlet weir; 3-1 Outlet weir; 3-2 Outlet channel; 4-1 Aerator; 4-2 Blower; 5 Biological filler area; 6 Short-range nitrification sludge; 7 Online monitoring subsystem; 7-1 Online ammonia nitrogen probe; 7-2 Online dissolved oxygen probe; 7-3 Display screen. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Instead, these embodiments are provided to make the present invention more thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0030] On one hand, the present invention provides an integrated sewage treatment and anaerobic ammonia oxidation bacteria retention system, which includes a reactor tank body, a water inlet subsystem, a water outlet subsystem, an aeration subsystem, a biological filler area, a short-range nitrification sludge and an online monitoring subsystem;

[0031] The water inlet subsystem is arranged at the upper part of the reactor body, and comprises an inner water inlet channel, a first water inlet weir, an outer water inlet channel, a second water inlet weir, a plurality of water inlet risers and a plurality of water distribution horns; the first water inlet weir is arranged between the inner water inlet channel and the outer water inlet channel;

[0032] The water outlet subsystem includes a water outlet weir and a water outlet channel; the water outlet channel is arranged between the water outlet weir and the second water inlet weir, the multiple water inlet risers are all connected to the bottom of the second water inlet weir and pass through the bottom of the water outlet weir, and the multiple water distribution horns are all arranged at the lower part of the reactor tank body and are respectively connected to the lower parts of the multiple water inlet risers;

[0033] The aeration subsystem includes a plurality of aerators and a blower; the blower is arranged outside the reactor body, the plurality of aerators are arranged at the bottom of the reactor body, and the plurality of aerators are connected to the blower through pipelines;

[0034] The biological filler area includes multiple groups of biological filler balls, each group of biological filler balls includes multiple biological filler balls connected in sequence, each of the biological filler balls contains anaerobic ammonia oxidation biofilm filler, and each group of biological filler balls is respectively arranged around each water inlet vertical pipe;

[0035] The short-cut nitrification sludge is arranged in the reactor body;

[0036] The online monitoring subsystem includes a display screen, an online ammonia nitrogen probe and an online dissolved oxygen probe; the online ammonia nitrogen probe and the online dissolved oxygen probe are both connected to the display screen and are both arranged in the reactor tank body.

[0037] According to the present invention, preferably, the number of the water inlet risers is determined according to the length of the reactor tank body. More preferably, the number of the water inlet risers is 4-20; and the number of the biological filler balls in each group of biological filler balls is 10-20.

[0038] In the present invention, the number of the aerators is determined according to the length of the reactor tank body. As a preferred solution, the number of the aerators is 20-30.

[0039] In the present invention, each group of biological filler balls is centrally symmetrically arranged around each water inlet vertical pipe.

[0040] In the present invention, the number of biological filler balls in each group of biological filler balls is more preferably 12.

[0041] In the present invention, as a preferred embodiment, the inner water inlet channel and the first water inlet weir are used for water intake, and the multiple water inlet risers and the multiple water distribution horns are used for water distribution.

[0042] In the present invention, the integrated sewage treatment and anaerobic ammonia oxidation bacteria retention system integrates the function of a secondary sedimentation tank.

[0043] In the present invention, the aeration subsystem can mix the short-cut nitrification sludge.

[0044] In the present invention, as a preferred embodiment, the online ammonia nitrogen probe and the online dissolved oxygen probe are both arranged at the upper part of the reactor cell body. The online ammonia nitrogen probe and the online dissolved oxygen probe are both connected to the display screen via wires.

[0045] Another aspect of the present invention provides a method for integrated sewage treatment and anaerobic ammonia-oxidizing bacteria retention, which method uses the integrated sewage treatment and anaerobic ammonia-oxidizing bacteria retention system, and comprises the following steps:

[0046] S1: allowing sewage to flow into the water inlet channel and flow to the bottom of the reactor tank through the multiple water distribution horns;

[0047] S2: After the water inflow in step S1 is completed, the sewage is aerated using the aeration subsystem, and the sewage in the reactor tank is monitored using the online monitoring subsystem. When the ammonia nitrogen concentration of the sewage in the reactor tank is less than a threshold value, the aeration is stopped;

[0048] S3: allowing the short-cut nitrification sludge to settle by gravity; when the settling mud level of the short-cut nitrification sludge remains unchanged, repeating the water intake process of step S1, while the effluent from the upper part of the reactor tank body is discharged from the system through the effluent subsystem.

[0049] S4: Repeat the above steps S1-S3 until the sewage meets the discharge standard and the treatment is completed.

[0050] In the present invention, the effluent from the upper part of the reactor tank body flows through the effluent weir of the effluent subsystem to the effluent channel and then is discharged from the system.

[0051] According to the present invention, preferably, in step S1, the rising flow rate is controlled to be 0.5-1.5m / h, so that the suspended sludge in the water inlet process sinks to the bottom of the pool and does not float up; the sewage water quality is: COD is 106.1-182.4mg / L, NH4 + -N is 40.24-64.97 mg / L, NO2 - -N is 0.00-1.12mg / L, NO3 - -N is 0.11-1.19 mg / L; SS is 60-138 mg / L; TP is 3.13-8.31 mg / L; alkalinity is 247-405 mg / L; pH is 7.02-7.58.

[0052] According to the present invention, preferably, in step S2, the dissolved oxygen concentration is monitored by the online dissolved oxygen probe and controlled at 0.2-0.3 mg / L. The threshold value is 4.5-5.5 mg / L, which is obtained by monitoring the online ammonia nitrogen probe.

[0053] According to the present invention, preferably, in step S3, the drainage ratio of the water intake and drainage process is 30-50%, and the rising flow rate is controlled to be 0.5-1.5 m / h.

[0054] According to the present invention, preferably, the effluent water quality is: COD <35mg / L, TN is 10-13mg / L, NH4 + -N concentration is 0-5mg / L, TP concentration is 0.1-0.3mg / L.

[0055] According to the present invention, preferably, the abundance of the anaerobic ammonium oxidizing bacteria in the anaerobic ammonium oxidizing biofilm filler before the autotrophic denitrification reaction is 10 5 -10 6 , after the autotrophic denitrification system runs stably, the abundance is 10 7 -10 8 .

[0056] The present invention is described in detail below with reference to the embodiments.

[0057] Example 1

[0058] This embodiment provides an integrated sewage treatment and anaerobic ammonia oxidation bacteria retention system, such as Figure 1 、 2 As shown, the system includes a reactor body 1, a water inlet subsystem 2, a water outlet subsystem 3, an aeration subsystem 4, a biological filler area 5, a short-cut nitrification sludge 6 and an online monitoring subsystem 7;

[0059] The water inlet subsystem 2 is arranged at the upper part of the reactor body 1, and the water inlet subsystem 2 includes an inner water inlet channel 2-1, a first water inlet weir 2-2, an outer water inlet channel 2-3, a second water inlet weir 2-6, a plurality of water inlet risers 2-4 and a plurality of water distribution horns 2-5; the first water inlet weir 2-2 is arranged between the inner water inlet channel 2-1 and the outer water inlet channel 2-3;

[0060] The water outlet subsystem 3 includes a water outlet weir 3-1 and a water outlet channel 3-2; the water outlet channel 3-2 is arranged between the water outlet weir 3-1 and the second water inlet weir 2-6, the multiple water inlet risers 2-4 are all connected to the bottom of the second water inlet weir 2-6 and pass through the bottom of the water outlet weir 3-1, and the multiple water distribution horns 2-5 are all arranged at the lower part of the reactor cell body 1 and are respectively connected to the lower parts of the multiple water inlet risers 2-4;

[0061] The aeration subsystem 4 includes multiple aerators 4-1 and a blower 4-2; the blower 4-2 is arranged outside the reactor tank body 1, and the multiple aerators 4-1 are all arranged at the bottom of the reactor tank body 1, and the multiple aerators 4-1 are all connected to the blower 4-2 through pipelines.

[0062] The biological filler area 5 includes multiple groups of biological filler balls, each group of biological filler balls includes multiple biological filler balls connected in sequence, and the biological filler balls are filled with anaerobic ammonia oxidation biofilm filler. Each group of biological filler balls is respectively arranged around each water inlet vertical pipe 2-4;

[0063] The short-cut nitrification sludge is arranged in the reactor body 1;

[0064] The online monitoring subsystem 7 includes a display screen 7-3, an online ammonia nitrogen probe 7-1, and an online dissolved oxygen probe 7-2. The online ammonia nitrogen probe 7-1 and the online dissolved oxygen probe 7-2 are both connected to the display screen 7-3 and are both disposed in the reactor tank body 1. The number of the water inlet risers 2-4 is determined by the length of the reactor tank body 1. The number of biological filler balls in each group of biological filler balls is 12.

[0065] Example 2

[0066] This embodiment provides an integrated method for treating sewage and retaining anaerobic ammonia-oxidizing bacteria. The sewage to be treated in this embodiment is the effluent from the primary sedimentation tank of the Gaobeidian Reclaimed Water Plant in Beijing. The effluent quality of the primary sedimentation tank is: COD 106.1-182.4 mg / L, NH4 + -N is 40.24-64.97 mg / L, NO2 - -N is 0.00-1.12mg / L, NO3 - -N is 0.11-1.19 mg / L; SS is 60-138 mg / L; TP is 3.13-8.31 mg / L; alkalinity is 247-405 mg / L; pH is 7.02-7.58.

[0067] The method uses the integrated sewage treatment and anaerobic ammonia oxidation bacteria retention system described in Example 1, and includes the following steps:

[0068] S1: Let the sewage flow into the water inlet channel 2-1 and flow to the bottom of the reactor tank body 1 through the multiple water distribution speakers 2-5; control the rising flow rate to 1.0m / h.

[0069] S2: After the water inlet of step S1 is completed, the sewage is aerated by the aeration subsystem 4, and the sewage in the reactor tank body 1 is monitored by the online monitoring subsystem 7. When the ammonia nitrogen concentration of the sewage in the reactor tank body 1 is less than the threshold value of 5 mg / L, the aeration is stopped; wherein, the dissolved oxygen concentration is monitored by the online dissolved oxygen probe 7-2 and the dissolved oxygen concentration is controlled at 0.25 mg / L, and the threshold value is obtained by monitoring the online ammonia nitrogen probe 7-1.

[0070] S3: Allow the short-cut nitrification sludge to settle by gravity. When the short-cut nitrification sludge settles to a constant level, repeat the water intake process of step S1. Simultaneously, the effluent from the upper portion of the reactor tank 1 is discharged from the system via the effluent subsystem 3. The water intake to water discharge ratio is 40%, and the upward flow rate is controlled at 1.0 m / h.

[0071] S4: Repeat the above steps S1-S3 until the sewage meets the discharge standard and the treatment is completed. The effluent water quality is: COD <35mg / L, TN is 10-13mg / L, NH4 + -N concentration is 0-5mg / L, TP concentration is 0.1-0.3mg / L. The abundance of anaerobic ammonium oxidation bacteria in the anaerobic ammonium oxidation biofilm filler before the autotrophic denitrification system reaction is 10 6 , after the autotrophic denitrification system is in stable operation, the abundance is 10 7 .

[0072] While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for integrated sewage treatment and anaerobic ammonia oxidation bacteria retention, characterized in that: The integrated sewage treatment and anaerobic ammonia oxidation bacteria retention system adopted in this method includes a reactor tank body, a water inlet subsystem, a water outlet subsystem, an aeration subsystem, a biological filler area, a short-range nitrification sludge and an online monitoring subsystem; The water inlet subsystem is arranged at the upper part of the reactor body, and comprises an inner water inlet channel, a first water inlet weir, an outer water inlet channel, a second water inlet weir, a plurality of water inlet risers and a plurality of water distribution horns; the first water inlet weir is arranged between the inner water inlet channel and the outer water inlet channel; The water outlet subsystem includes a water outlet weir and a water outlet channel; the water outlet channel is arranged between the water outlet weir and the second water inlet weir, the multiple water inlet risers are all connected to the bottom of the second water inlet weir and pass through the bottom of the water outlet weir, and the multiple water distribution horns are all arranged at the lower part of the reactor tank body and are respectively connected to the lower parts of the multiple water inlet risers; The aeration subsystem includes a plurality of aerators and a blower; the blower is arranged outside the reactor body, the plurality of aerators are arranged at the bottom of the reactor body, and the plurality of aerators are connected to the blower through pipelines; The biological filler area includes multiple groups of biological filler balls, each group of biological filler balls includes multiple biological filler balls connected in sequence, each of the biological filler balls contains anaerobic ammonia oxidation biofilm filler, and each group of biological filler balls is respectively arranged around each water inlet vertical pipe; The short-cut nitrification sludge is arranged in the reactor body; The online monitoring subsystem includes a display screen, an online ammonia nitrogen probe and an online dissolved oxygen probe; the online ammonia nitrogen probe and the online dissolved oxygen probe are both connected to the display screen and are both arranged in the reactor cell body; The method comprises the following steps: S1: allowing sewage to flow into the water inlet channel and flow to the bottom of the reactor tank through the multiple water distribution horns; S2: After the water inflow in step S1 is completed, the sewage is aerated using the aeration subsystem, and the sewage in the reactor tank is monitored using the online monitoring subsystem. When the ammonia nitrogen concentration of the sewage in the reactor tank is less than a threshold value, the aeration is stopped; S3: allowing the short-cut nitrification sludge to settle by gravity; when the sludge level of the short-cut nitrification sludge remains unchanged, repeating the water intake process of step S1, while the effluent from the upper part of the reactor tank body is discharged from the system through the effluent subsystem; S4: Repeat the above steps S1-S3 until the sewage meets the discharge standard and the treatment is completed; In step S1, the rising flow rate is controlled to be 0.5-1.5 m / h; In step S3, the drainage ratio of the water inlet and drainage process is 30-50%, and the rising flow rate is controlled to be 0.5-1.5m / h; The abundance of the anaerobic ammonium oxidation bacteria in the anaerobic ammonium oxidation biofilm filler before the autotrophic denitrification reaction is 10 5 -10 6 , after the autotrophic denitrification system runs stably, the abundance is 10 7 -10 8 .

2. The integrated sewage treatment and anaerobic ammonia oxidation bacteria retention method according to claim 1, wherein: The number of the water inlet vertical pipes is determined according to the length of the reactor tank body; the number of the biological filler balls in each group of biological filler balls is 10-20.

3. The method for integrated sewage treatment and anaerobic ammonia oxidation bacteria retention according to claim 1, wherein: In step S1, the sewage water quality is: COD is 106.1-182.4 mg / L, NH4 + -N is 40.24-64.97 mg / L, NO2 - -N is 0.00-1.12mg / L, NO3 - -N is 0.11-1.19 mg / L; SS is 60-138 mg / L; TP is 3.13-8.31 mg / L; alkalinity is 247-405 mg / L; pH is 7.02-7.

58.

4. The method for integrated sewage treatment and anaerobic ammonia oxidation bacteria retention according to claim 1, wherein: In step S2, the dissolved oxygen concentration is monitored by the online dissolved oxygen probe and controlled at 0.2-0.3 mg / L.

5. The method for integrated sewage treatment and anaerobic ammonia oxidation bacteria retention according to claim 1, wherein: In step S2, the threshold value is 4.5-5.5 mg / L, which is obtained by monitoring the online ammonia nitrogen probe.

6. The method for integrated sewage treatment and anaerobic ammonia-oxidizing bacteria retention according to any one of claims 1 to 5, wherein: The effluent water quality is: COD <35mg / L, TN is 10-13mg / L, NH4 + -N concentration is 0-5mg / L, TP concentration is 0.1-0.3mg / L.

Images