Upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation denitrification integrated system and sewage treatment method

Abstract

The application belongs to the technical field of sewage treatment, and discloses a lift-flow type sewage enhanced biological phosphorus removal coupled with anaerobic ammonia oxidation and denitrification integrated system and a sewage treatment method. The system comprises a lift-flow type water distribution subsystem, a biochemical subsystem and a monitoring control subsystem. The method comprises the following steps: inoculating short-cut nitrification floc sludge and anaerobic ammonia oxidation biofilm into a biochemical tank, lifting sewage to a lift-flow type water distribution device, and carrying out water feeding; after the water feeding is completed, carrying out aeration treatment, stopping the aeration treatment when the ammonia nitrogen concentration decreases to a threshold value, and carrying out sludge discharge treatment; repeating the water feeding process, and discharging the effluent at the top of the biochemical tank out of the system; after the water feeding and the effluent discharge are completed, carrying out hydraulic mixing treatment until the effluent quality reaches a discharge standard. The application completes the effluent in the water feeding process, saves the land occupation of a secondary sedimentation tank, and effectively improves the phosphorus source recovery efficiency and the carbon source recovery efficiency in sewage.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and more specifically, relates to an integrated upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonia oxidation denitrification system and a sewage treatment method. Background Art

[0002] With the acceleration of urbanization, land use is becoming increasingly scarce. Currently, phosphorus in wastewater can be efficiently removed through chemical methods, while nitrogen removal primarily relies on biological methods. However, chemical phosphorus removal leads to increased sludge production, increased difficulty in sludge treatment, and increased treatment costs. Traditional nitrification-denitrification biological denitrification processes require high aeration and external carbon source costs, and struggle to meet increasingly stringent pollutant emission standards. This makes nitrogen and phosphorus removal a major challenge for the wastewater treatment industry.

[0003] A specially designed upflow water distributor ensures even water distribution across the reactor bottom. By utilizing water pressure, water inflow and outflow occur simultaneously, saving floor space. This reduces the footprint of the secondary sedimentation tank, alleviating land shortages.

[0004] Enhanced biological phosphorus removal (EBPR) involves alternating the operation of activated sludge under anaerobic and aerobic conditions. This allows the dominant growth of phosphate-accumulating bacteria, which accumulate excessive phosphates, resulting in a higher phosphorus content in the activated sludge than in standard activated sludge. The phosphate-accumulating bacteria in the sludge release phosphorus under anaerobic conditions and excessively absorb it under aerobic conditions. Phosphorus removal is achieved through the discharge of activated sludge. EBPR can significantly reduce sludge treatment costs, save on the amount of phosphorus removal chemicals required, and directly lower operating costs.

[0005] The anaerobic ammonium oxidation (ANAMMOX) process represents a significant breakthrough in both concept and technology for the traditional nitrification-denitrification process. ANAMMOX bacteria utilize nitrite as an electron acceptor to oxidize ammonia nitrogen to produce nitrogen gas, utilizing inorganic carbon as a carbon source, rather than requiring organic matter as a carbon source, thereby achieving autotrophic biological denitrification. Compared to traditional biological denitrification, the short-term nitrification plus ANAMMOX autotrophic denitrification process can reduce aeration volume by 60% and carbon source dosage by 100%. ANAMMOX has been successfully applied on a large scale to treat high-ammonia nitrogen wastewater, such as sludge digestate, landfill leachate, aquaculture wastewater, and pharmaceutical wastewater. However, the practical application of this technology in municipal wastewater still faces numerous technical challenges that require overcoming.

[0006] Therefore, in response to the accelerated urbanization process, the problem of land shortage, and the problems of difficulty in producing and stably maintaining granular sludge, instability of enhanced biological phosphorus removal, and difficulty in implementing anaerobic ammonia oxidation technology in existing technologies, it is urgent to propose a new device and method for treating sewage. Summary of the Invention

[0007] The present invention addresses the shortcomings of existing technologies by providing an integrated upflow sewage treatment system for enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation denitrification, as well as a sewage treatment method. This system achieves effluent during the influent process, saving space in secondary sedimentation tanks and effectively improving the efficiency of phosphorus and carbon source recovery in sewage.

[0008] In order to achieve the above object, the present invention provides an upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonia oxidation denitrification integrated system, which includes: an upflow water distribution subsystem, a biochemical subsystem and a monitoring and control subsystem;

[0009] The upflow water distribution subsystem includes: a water inlet tank, a water inlet pump, a water inlet pipeline and an upflow water distribution device; the upflow water distribution device includes a water distribution main pipe, horizontal water distribution branches and vertical water distribution branches; the horizontal water distribution branches are multiple, and the multiple horizontal water distribution branches are respectively vertically arranged on the water distribution main pipe and connected to the water distribution main pipe, and the lower part of each horizontal water distribution branch is connected to multiple vertical water distribution branches; the water inlet tank, the water inlet pump, the water inlet pipeline and the water distribution main pipe are connected in sequence;

[0010] The biochemical subsystem includes: a biochemical pool, a short-range nitrification flocculent sludge, an anaerobic ammonium oxidation biofilm, an aerator, an immobilized biological filler support, an air compressor, an air volume regulating valve, a hydraulic mixing device, a water outlet weir and a sludge pump; the lower ends of the multiple vertical water distribution branches are close to the bottom of the biochemical pool; the short-range nitrification flocculent sludge and the immobilized biological filler support are both arranged in the biochemical pool, and the immobilized biological filler support is provided with the anaerobic ammonium oxidation biofilm; the aerator and the hydraulic mixing device are both arranged at the bottom of the biochemical pool; the hydraulic mixing device It includes a hydraulic mixing device main pipe, multiple hydraulic mixing device branch pipes, a mixer pipeline and a hydraulic mixer water pump. The multiple hydraulic mixing device branch pipes are respectively arranged vertically on the hydraulic mixing device and are respectively connected to the hydraulic mixing device main pipe. Each hydraulic mixing device branch pipe is a perforated water inlet pipe; the upper part or the middle part of one side of the pool wall of the biochemical pool, the mixer pipeline, the hydraulic mixer water pump, and the hydraulic mixing device main pipe are connected in sequence; the water outlet weir is arranged at the top of the pool wall of the biochemical pool; the mud discharge pump is connected to the other side of the pool wall of the biochemical pool;

[0011] The monitoring and control subsystem includes a control device and an online monitoring probe; the online monitoring probe is arranged on the upper part of the biochemical pool, and the control device is used to control the chain reaction of the system.

[0012] Another aspect of the present invention provides an upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation denitrification integrated sewage treatment method, using the upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation denitrification integrated system, the method comprising the following steps:

[0013] S1: inoculating the short-range nitrification flocculent sludge and the anaerobic ammonium oxidation biofilm into the biochemical pool, and lifting the sewage from the water inlet tank to the upflow water distribution device by the water inlet pump for water inlet;

[0014] S2: After the water inflow is completed, aeration treatment is performed. When the ammonia nitrogen concentration drops to a threshold value, the aeration treatment is stopped, and sludge discharge treatment is performed to maintain the concentration of the short-range nitrification flocculent sludge unchanged;

[0015] S3: Repeat the water inlet process of step S1, and at the same time, the effluent from the top of the biochemical pool is discharged from the system through the effluent weir;

[0016] S4: After the water intake and drainage in step S3 are completed, a hydraulic mixing process is performed; after the hydraulic mixing process is completed, steps S2-S4 are repeated until the effluent water quality meets the discharge standard.

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

[0018] (1) The present invention adopts upflow water distribution technology. During the water intake process, the water discharge is completed by relying on the water intake pressure. No secondary sedimentation tank is required, which saves space. This process meets market demand.

[0019] (2) The present invention can enhance biological phosphorus removal by absorbing phosphorus in the water into activated sludge through aerobic phosphorus absorption and anaerobic phosphorus release by polyphosphate bacteria. No external chemicals are needed, which reduces operating costs, sludge production, and sludge treatment costs, and effectively improves the efficiency of phosphorus source recovery in sewage.

[0020] (3) The present invention adopts integrated anaerobic ammonium oxidation as the main denitrification pathway, which saves aeration energy consumption, saves land, saves carbon source addition, reduces residual sludge production, reduces greenhouse gas emissions, and effectively improves the efficiency of carbon source recovery in sewage.

[0021] (4) The present invention adopts an integrated short-range nitrification-anaerobic ammonium oxidation process. Short-range nitrifying bacteria exist in the floc sludge, and anaerobic ammonium oxidizing bacteria gather on the surface of the fixed filler. This makes the short-range nitrification sludge and anaerobic ammonium oxidizing bacteria not interfere with each other, and realizes the stable operation of the integrated upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation denitrification system.

[0022] (5) The structure of the upflow water distribution device of the present invention is conducive to the production of granular sludge. Under long-term operation, granular sludge (short-range nitrification granular sludge and anaerobic ammonium oxidation granular sludge) appears in the system, forming a biochemical system that contains biofilm, flocculent sludge, and granular sludge. The coexistence of multiple biological systems enables the biochemical reaction to proceed efficiently and stably, and significantly improves the shock load resistance and low temperature resistance.

[0023] (6) The sewage to which the present invention is applicable is not limited to low-ammonia nitrogen sewage, but is also applicable to high-ammonia nitrogen sewage.

[0024] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 A front view of an integrated upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation denitrification system provided by the present invention is shown.

[0027] Figure 2 A right view of an integrated upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation denitrification system provided by the present invention is shown.

[0028] Figure 3 A top view of an integrated upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation denitrification system provided by the present invention is shown.

[0029] The following are the descriptions of the reference numerals:

[0030] 1-water inlet pump, 2-water inlet pipeline, 3-upflow water distribution device, 4-mixer pipeline; 5-sludge pump; 6-hydraulic mixer water pump, 7-air compressor, 8-biochemical pool, 9-immobilized biological filler support, 10-aerator, 11-hydraulic mixing device branch pipe, 12-vertical water distribution branch pipe, 13-hydraulic mixing device main pipe, 14-water outlet weir, 15-online monitoring probe, 16-air volume regulating valve. DETAILED DESCRIPTION

[0031] 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.

[0032] On one hand, the present invention provides an integrated system for enhanced biological phosphorus removal and anaerobic ammonia oxidation denitrification of sewage, which comprises an upflow water distribution subsystem, a biochemical subsystem and a monitoring and control subsystem;

[0033] The upflow water distribution subsystem includes: a water inlet tank, a water inlet pump, a water inlet pipeline and an upflow water distribution device; the upflow water distribution device includes a water distribution main pipe, horizontal water distribution branches and vertical water distribution branches; the horizontal water distribution branches are multiple, and the multiple horizontal water distribution branches are respectively vertically arranged on the water distribution main pipe and connected to the water distribution main pipe, and the lower part of each horizontal water distribution branch is connected to multiple vertical water distribution branches; the water inlet tank, the water inlet pump, the water inlet pipeline and the water distribution main pipe are connected in sequence;

[0034] The biochemical subsystem includes: a biochemical pool, a short-range nitrification flocculent sludge, an anaerobic ammonium oxidation biofilm, an aerator, an immobilized biological filler support, an air compressor, an air volume regulating valve, a hydraulic mixing device, a water outlet weir and a sludge pump; the lower ends of the multiple vertical water distribution branches are close to the bottom of the biochemical pool; the short-range nitrification flocculent sludge and the immobilized biological filler support are both arranged in the biochemical pool, and the immobilized biological filler support is provided with the anaerobic ammonium oxidation biofilm; the aerator and the hydraulic mixing device are both arranged at the bottom of the biochemical pool; the hydraulic mixing device It includes a hydraulic mixing device main pipe, multiple hydraulic mixing device branch pipes, a mixer pipeline and a hydraulic mixer water pump. The multiple hydraulic mixing device branch pipes are respectively arranged vertically on the hydraulic mixing device and are respectively connected to the hydraulic mixing device main pipe. Each hydraulic mixing device branch pipe is a perforated water inlet pipe; the upper part or the middle part of one side of the pool wall of the biochemical pool, the mixer pipeline, the hydraulic mixer water pump, and the hydraulic mixing device main pipe are connected in sequence; the water outlet weir is arranged at the top of the pool wall of the biochemical pool; the mud discharge pump is connected to the other side of the pool wall of the biochemical pool;

[0035] The monitoring and control subsystem includes a control device and an online monitoring probe; the online monitoring probe is arranged on the upper part of the biochemical pool, and the control device is used to control the chain reaction of the system.

[0036] In the present invention, the number of the horizontal water distribution branches and the number of the vertical water distribution branches are set according to the size of the biochemical pool. The number of the branch pipes of the hydraulic mixing device is set according to the size of the biochemical pool.

[0037] According to the present invention, preferably, the air compressor is arranged outside the biochemical pool, and the aerator, the air volume regulating valve, and the air compressor are connected in sequence.

[0038] According to the present invention, preferably, the online monitoring probe includes an online ammonia nitrogen and nitric nitrogen integrated sensor probe and a DO sensor probe; and the control device is a PLC control device.

[0039] In the present invention, the control device is connected to the online monitoring probe, the gas volume regulating valve and the hydraulic mixing device through signal lines. The monitoring indicators of the online monitoring probe include: NH4+ -N concentration, NO3 - -N concentration, pH value and dissolved oxygen are monitored by the online monitoring probe, and the opening of the gas volume regulating valve is adjusted in real time through the control device.

[0040] Another aspect of the present invention provides an upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation denitrification integrated sewage treatment method, using the upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation denitrification integrated system, the method comprising the following steps:

[0041] S1: inoculating the short-range nitrification flocculent sludge and the anaerobic ammonium oxidation biofilm into the biochemical pool, and lifting the sewage from the water inlet tank to the upflow water distribution device by the water inlet pump for water inlet;

[0042] S2: After the water inflow is completed, aeration treatment is performed. When the ammonia nitrogen concentration drops to a threshold value, the aeration treatment is stopped, and sludge discharge treatment is performed to maintain the concentration of the short-range nitrification flocculent sludge unchanged;

[0043] S3: Repeat the water inlet process of step S1, and at the same time, the effluent from the top of the biochemical pool is discharged from the system through the effluent weir;

[0044] S4: After the water intake and drainage in step S3 are completed, a hydraulic mixing process is performed; after the hydraulic mixing process is completed, steps S2-S4 are repeated until the effluent water quality meets the discharge standard.

[0045] According to the present invention, preferably, in step S1:

[0046] The concentration of the short-range nitrification flocculent sludge is 3000-4000 mg / L, the concentration of the anaerobic ammonium oxidation biofilm is 6500-8000 mg / L, and the filling ratio of the anaerobic ammonium oxidation biofilm is 25%-35%;

[0047] The sewage is low ammonia nitrogen sewage or high ammonia nitrogen sewage; the low ammonia nitrogen sewage is general urban sewage

[0048] water inlet to water treatment plants;

[0049] The rising flow rate of the inlet water in step S1 does not exceed 1.5 m / h.

[0050] In the present invention, during the water inlet process of step S1, the sewage passes through the upflow water distribution device, and the inlet water flows from the bottom of the biochemical pool upward through the vertical water distribution branches until the liquid level of the biochemical pool reaches the set liquid level, and the water inlet is completed.

[0051] In the present invention, the sewage water quality treated by the upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonia oxidation denitrification integrated sewage treatment method is not limited to a range and can be adjusted to a suitable water quality by mixing and dilution. As a preferred solution, the water quality characteristics of the low ammonia nitrogen sewage are COD concentration of 100-300 mg / L, NH4 + -N concentration is 35-100 mg / L, the water quality characteristics of the high ammonia nitrogen sewage are COD concentration of 300-4000 mg / L, NH4 + -N concentration is 70-3500mg / L. The effluent water quality of the low ammonia nitrogen sewage treated by the method is characterized by a COD concentration of 20.2-42.5mg / L, NH4 + -N concentration is 0.5-2.4 mg / L.

[0052] According to the present invention, preferably, in step S2:

[0053] The aeration treatment step includes controlling the start and stop of the air compressor by the control device, and controlling the opening of the air volume regulating valve to control the dissolved oxygen concentration at 0.1-0.5 mg / L;

[0054] The threshold is 1.5-2.5 mg / L;

[0055] When the aeration treatment is stopped, the water quality characteristics in the biochemical pool are: TP < 0.3 mg / L, COD < 30.0 mg / L, TN < 10 mg / L;

[0056] The sludge discharge treatment step includes controlling the sludge discharge pump to discharge sludge through the control device after the short-range nitrification flocculent sludge is settled.

[0057] In the present invention, in the aeration treatment step, the main pollutant COD in the sewage is removed, and part of the ammonia nitrogen (NH4 + -N) is oxidized to nitrite nitrogen (NO - 2-N), while anaerobic ammonium oxidation reaction occurs, and there is also simultaneous nitrification and denitrification. Nitrogen pollutants are removed. Polyphosphate bacteria absorb a large amount of orthophosphate PO 3- 4-P, converts orthophosphate in sewage into PO 3- 4-P is adsorbed into the activated sludge. During this process, the control device uses an online ammonia nitrogen and nitrate nitrogen integrated sensor probe and a DO sensor probe to monitor the reaction progress in the tank. By directly adjusting the opening of the gas volume control valve, the dissolved oxygen is controlled to maintain the short-term nitrification stability of the system.

[0058] The control device determines the progress of short-range nitrification and anaerobic ammonium oxidation reaction by monitoring the online ammonia nitrogen and nitric nitrogen integrated sensor probe and DO sensor probe in the pool.+ When the concentration of -N) drops to a threshold, the air compressor stops working. At the same time, the biochemical tank serves as a sedimentation tank to allow the activated sludge to settle. When the sedimentation process is completed, the control device controls the sludge pump to remove phosphorus in the activated sludge by sludge discharge.

[0059] According to the present invention, preferably, the rising flow rate of the incoming water in step S3 does not exceed 1.5 m / h; the control device sets a suitable water exchange ratio according to actual on-site conditions, preferably, the water exchange ratio is 30%-70%.

[0060] In the present invention, in step S3, water is introduced into the bottom of the biochemical pool while water is discharged from the top of the biochemical pool, thereby saving water replacement time.

[0061] According to the present invention, preferably, in step S4, the hydraulic mixing treatment step includes controlling the hydraulic mixer water pump through the control device to pump the solution in the biochemical pool to the bottom of the biochemical pool, and spraying it into the biochemical pool through the hydraulic mixing device main pipe and the multiple hydraulic mixing device branch pipes; the time of the hydraulic mixing treatment is 1-2 hours.

[0062] In the present invention, in step S4, after the water intake and drainage in step S3 are completed, the control device controls the hydraulic mixing device to operate, the biochemical pool is in an anaerobic state, the polyphosphate bacteria release phosphorus and multiply in large quantities, and the total nitrogen is further reduced due to the denitrification.

[0063] The present invention describes an integrated upflow sewage treatment system for enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation (ANAMMOX) denitrification, and a sewage treatment method suitable for both sequencing batch and continuous flow reactions. The system can be used to treat sewage in practical projects and can also operate independently as a granular sludge (including short-cut nitrification granular sludge and ANAMMOX granular sludge) cultivation device and an ANAMMOX bacterial strain retention and cultivation device.

[0064] The present invention is further illustrated by the following examples.

[0065] The anaerobic ammonium oxidation biofilm filler and the short-cut nitrification floc sludge are both derived from the sludge digestion liquid integrated anaerobic ammonium oxidation demonstration project.

[0066] Example 1

[0067] This embodiment provides an integrated system for enhanced biological phosphorus removal and anaerobic ammonium oxidation denitrification of sewage. Figure 1 、 Figure 2 、 Figure 3 As shown, the system includes: an upflow water distribution subsystem, a biochemical subsystem and a monitoring and control subsystem;

[0068] The upflow water distribution subsystem includes: a water inlet tank (not shown), a water inlet pump 1, a water inlet pipeline 2 and an upflow water distribution device 3; the upflow water distribution device 3 includes a water distribution main pipe, horizontal water distribution branches and vertical water distribution branches 12; the horizontal water distribution branches are multiple, and the multiple horizontal water distribution branches are respectively vertically arranged on the water distribution main pipe and connected to the water distribution main pipe, and the lower part of each horizontal water distribution branch is connected to multiple vertical water distribution branches 12; the water inlet tank, the water inlet pump 1, the water inlet pipeline 2, and the water distribution main pipe are connected in sequence;

[0069] The biochemical subsystem includes: a biochemical pool 8, a short-range nitrification flocculent sludge, an anaerobic ammonium oxidation biofilm, an aerator 10, an immobilized biological filler support 9, an air compressor 7, an air volume regulating valve 16, a hydraulic mixing device, a water outlet weir 14 and a sludge pump 5; the lower ends of the multiple vertical water distribution branches 12 are close to the bottom of the biochemical pool 8; the short-range nitrification flocculent sludge and the immobilized biological filler support 9 are both arranged in the biochemical pool 8, and the immobilized biological filler support 9 is provided with the anaerobic ammonium oxidation biofilm; the aerator 10 and the hydraulic mixing device are both arranged at the bottom of the biochemical pool 8; the hydraulic mixing device includes It includes a hydraulic mixing device main pipe 13, multiple hydraulic mixing device branch pipes 11, a mixer pipeline 4 and a hydraulic mixer water pump 6. The multiple hydraulic mixing device branch pipes 11 are respectively vertically arranged on the hydraulic mixing device and are respectively connected to the hydraulic mixing device main pipe 13. Each hydraulic mixing device branch pipe 11 is a perforated water inlet pipe; the upper part or the middle part of one side of the wall of the biochemical pool 8, the mixer pipeline 4, the hydraulic mixer water pump 6, and the hydraulic mixing device main pipe 13 are connected in sequence; the water outlet weir 14 is arranged at the top of the pool wall of the biochemical pool 8; the mud discharge pump 5 is connected to the other side of the pool wall of the biochemical pool 8;

[0070] The monitoring and control subsystem includes a control device (not shown) and an online monitoring probe 15; the online monitoring probe 15 is arranged on the upper part of the biochemical pool 8, and the control device is used to control the chain reaction of the system.

[0071] The air compressor is installed outside the biochemical pool, and the aerator, the air volume regulating valve, and the air compressor are connected in sequence. The online monitoring probe includes an online ammonia nitrogen and nitrate nitrogen integrated sensor probe and a DO sensor probe; the control device is a PLC control device.

[0072] Example 2

[0073] This embodiment provides an upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonia oxidation denitrification integrated sewage treatment method, using the upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonia oxidation denitrification integrated system described in Example 1, such as Figure 1 、 Figure 2 、 Figure 3 As shown, the method includes the following steps:

[0074] S1: inoculating the short-range nitrification flocculent sludge and the anaerobic ammonium oxidation biofilm into the biochemical pool 8, and lifting the sewage from the water inlet tank to the upflow water distribution device 3 by the water inlet pump 1 for water inlet;

[0075] S2: After the water inflow is completed, aeration treatment is performed. When the ammonia nitrogen concentration drops to a threshold value, the aeration treatment is stopped, and sludge discharge treatment is performed to maintain the concentration of the short-range nitrification flocculent sludge unchanged;

[0076] S3: Repeat the water inlet process of step S1, and at the same time, the effluent from the top of the biochemical pool 8 is discharged from the system through the effluent weir 14;

[0077] S4: After the water intake and drainage in step S3 are completed, a hydraulic mixing process is performed; after the hydraulic mixing process is completed, steps S2-S4 are repeated until the effluent water quality meets the discharge standard.

[0078] In step S1:

[0079] The concentration of the short-range nitrification flocculent sludge is 3500 mg / L, the concentration of the anaerobic ammonium oxidation biofilm is 7000 mg / L, and the filling ratio of the anaerobic ammonium oxidation biofilm is 30%; the rising flow rate of the influent in step S1 does not exceed 1.5 m / h.

[0080] The sewage is low-ammonia nitrogen urban sewage, which is the effluent from the primary sedimentation tank of Beijing Gaobeidian Sewage Treatment Plant. Its water quality characteristics are shown in Table 1.

[0081] Table 1 Water quality of low ammonia nitrogen urban sewage

[0082]

[0083] In step S2:

[0084] The aeration treatment step includes controlling the start and stop of the air compressor 7 by the control device, and controlling the opening of the air volume regulating valve 16 to control the dissolved oxygen concentration at 0.1-0.5 mg / L;

[0085] The threshold is 2 mg / L;

[0086] When the aeration treatment is stopped, the water quality characteristics in the biochemical pool are: TP < 0.3 mg / L, COD < 30.0 mg / L, TN < 10 mg / L;

[0087] The sludge discharge treatment step includes controlling the sludge discharge pump 5 to discharge sludge through the control device after the short-range nitrification flocculent sludge has settled.

[0088] The rising flow rate of the inlet water in step S3 does not exceed 1.5 m / h, and the water exchange ratio is 30%-70%.

[0089] In step S4, the hydraulic mixing treatment step includes controlling the hydraulic mixer water pump 6 through the control device to pump the solution in the biochemical pool 8 to the bottom of the biochemical pool 8, and spraying it into the biochemical pool 8 through the hydraulic mixing device main pipe 13 and the multiple hydraulic mixing device branch pipes 11; the time of the hydraulic mixing treatment is 1-2 hours.

[0090] The upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonia oxidation denitrification integrated system is in a high-efficiency and stable operation state for a long time. The effluent water quality of the low-ammonia nitrogen urban sewage treated by the method of the embodiment of the present invention is characterized by a COD concentration of 20.2-42.5 mg / L, a TP concentration of 0.15-0.30 mg / L, and NH4 + -N concentration is 0.5-2.4mg / L, NO2 - -N concentration is 0.1-1.0mg / L, NO3 - -N concentration is 1.0-2.8mg / L, TN concentration is 3.2-6.2mg / L. Its effluent quality meets and exceeds the Class A emission standard of the Pollutant Discharge Standard for Urban Wastewater Treatment Plants (GB18918-2002).

[0091] 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. An integrated sewage treatment method for upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation denitrification, characterized in that: The method adopts an upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation denitrification integrated system comprising: an upflow water distribution subsystem, a biochemical subsystem and a monitoring and control subsystem; The upflow water distribution subsystem includes: a water inlet tank, a water inlet pump, a water inlet pipeline and an upflow water distribution device; the upflow water distribution device includes a water distribution main pipe, horizontal water distribution branches and vertical water distribution branches; the horizontal water distribution branches are multiple, and the multiple horizontal water distribution branches are respectively vertically arranged on the water distribution main pipe and connected to the water distribution main pipe, and the lower part of each horizontal water distribution branch is connected to multiple vertical water distribution branches; the water inlet tank, the water inlet pump, the water inlet pipeline and the water distribution main pipe are connected in sequence; The biochemical subsystem includes: a biochemical pool, a short-range nitrification flocculent sludge, an anaerobic ammonium oxidation biofilm, an aerator, an immobilized biological filler support, an air compressor, an air volume regulating valve, a hydraulic mixing device, a water outlet weir and a sludge pump; the lower ends of the multiple vertical water distribution branches are close to the bottom of the biochemical pool; the short-range nitrification flocculent sludge and the immobilized biological filler support are both arranged in the biochemical pool, and the immobilized biological filler support is provided with the anaerobic ammonium oxidation biofilm; the aerator and the hydraulic mixing device are both arranged at the bottom of the biochemical pool; the hydraulic mixing device includes The invention comprises a hydraulic mixing device main pipe, multiple hydraulic mixing device branch pipes, a mixer pipeline and a hydraulic mixer water pump. The multiple hydraulic mixing device branch pipes are respectively arranged vertically on the hydraulic mixing device main pipe and are respectively connected to the hydraulic mixing device main pipe. Each hydraulic mixing device branch pipe is a perforated water inlet pipe. The upper part or the middle part of one side of the wall of the biochemical pool, the mixer pipeline, the hydraulic mixer water pump, and the hydraulic mixing device main pipe are connected in sequence. The water outlet weir is arranged at the top of the pool wall of the biochemical pool. The mud discharge pump is connected to the other side of the pool wall of the biochemical pool. The monitoring and control subsystem includes a control device and an online monitoring probe; the online monitoring probe is arranged on the upper part of the biochemical pool, and the control device is used to control the chain reaction of the system; The method comprises the following steps: S1: inoculating the short-range nitrification flocculent sludge and the anaerobic ammonium oxidation biofilm into the biochemical pool, and lifting the sewage from the water inlet tank to the upflow water distribution device by the water inlet pump for water inlet; The rising flow rate of the inlet water in step S1 does not exceed 1.5 m / h; S2: After the water inflow is completed, aeration treatment is performed. When the ammonia nitrogen concentration drops to a threshold value, the aeration treatment is stopped, and sludge discharge treatment is performed to maintain the concentration of the short-range nitrification flocculent sludge unchanged; The sludge discharge treatment step includes controlling the sludge discharge pump to discharge sludge by the control device after the short-range nitrification flocculent sludge settles; S3: Repeat the water inlet process of step S1, and at the same time, the effluent from the top of the biochemical pool is discharged from the system through the effluent weir; The rising flow rate of the inlet water in step S3 does not exceed 1.5 m / h; S4: After the water intake and drainage in step S3 are completed, a hydraulic mixing process is performed; after the hydraulic mixing process is completed, steps S2-S4 are repeated until the effluent water quality meets the discharge standard; The hydraulic mixing treatment step includes controlling the hydraulic mixer water pump through the control device to pump the solution in the biochemical pool to the bottom of the biochemical pool, and spraying the solution into the biochemical pool through the hydraulic mixing device main pipe and the multiple hydraulic mixing device branch pipes.

2. The upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation denitrification integrated sewage treatment method according to claim 1, wherein: The air compressor is arranged outside the biochemical pool, and the aerator, the air volume regulating valve and the air compressor are connected in sequence.

3. The upflow sewage enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation denitrification integrated sewage treatment method according to claim 1, wherein: The online monitoring probe includes an online ammonia nitrogen and nitric nitrogen integrated sensor probe and a DO sensor probe; the control device is a PLC control device.

4. The upflow sewage treatment method of enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation and denitrification according to claim 1, wherein: In step S1, the concentration of the short-cut nitrification flocculent sludge is 3000-4000 mg / L, the concentration of the anaerobic ammonium oxidation biofilm is 6500-8000 mg / L, and the filling ratio of the anaerobic ammonium oxidation biofilm is 25%-35%.

5. The upflow sewage treatment method for enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation and denitrification according to claim 1, wherein: In step S1, the sewage is low-ammonia nitrogen sewage or high-ammonia nitrogen sewage.

6. The upflow sewage treatment method for enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation and denitrification according to claim 1, wherein: In step S2: The aeration treatment step includes controlling the start and stop of the air compressor by the control device, and controlling the opening of the air volume regulating valve to control the dissolved oxygen concentration at 0.1-0.5 mg / L; The threshold value is 1.5-2.5 mg / L.

7. The upflow sewage treatment method of enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation denitrification according to claim 1, wherein: The water replacement ratio in step S3 is 30%-70%.

8. The upflow sewage treatment method for enhanced biological phosphorus removal coupled with anaerobic ammonium oxidation and denitrification according to claim 1, wherein: The time of the hydraulic mixing treatment is 1-2 hours.

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