Device for strengthening synchronous denitrification and efficient phosphorus removal based on multi-stage A / O (Anoxic / Oxic) process and operation method

Abstract

The invention provides a device for strengthening synchronous denitrification and efficient dephosphorization based on a multistage A / O process and an operation method, and relates to the field of municipal domestic sewage biological treatment.The device comprises a water inlet device, a multistage A / O treatment reactor, a secondary sedimentation tank and an automatic control system, the water inlet device is connected with the multistage A / O treatment reactor, the multistage A / O treatment reactor is connected with the secondary sedimentation tank, and the secondary sedimentation tank is connected with the automatic control system. The automatic control system is respectively in control connection with the water inlet device, the multi-stage A / O treatment reactor and the secondary sedimentation tank and is used for data monitoring and regulation management; sewage in the water inlet device enters the multi-stage A / O treatment reactor for nitrogen and phosphorus removal, effluent of the multi-stage A / O treatment reactor flows into the secondary sedimentation tank for sludge-water separation, sludge at the bottom of the secondary sedimentation tank respectively flows back to the multi-stage A / O treatment reactor, and residual sludge in the secondary sedimentation tank is discharged out of the system. By optimizing the stirring mode and controlling the backflow system, short-cut nitrification and denitrification, aerobic synchronous denitrification and enrichment of efficient phosphorus removal flora are achieved, the aeration intensity is effectively reduced, and energy conservation and consumption reduction are achieved.

Description

Technical Field

[0001] The present invention relates to the field of biological treatment of municipal sewage, and in particular to a device and an operating method for enhanced simultaneous denitrification and efficient phosphorus removal based on a multi-stage A / O process. Background Art

[0002] With the development of social economy and the improvement of material consumption level, water pollution has become increasingly prominent, among which the discharge and pollution concentration of urban sewage have been increasing. The discharge of nitrogen and phosphorus rich in sewage into natural water bodies will lead to the massive reproduction of algae, causing eutrophication of water bodies, which has brought many impacts on human life and production. Therefore, it is urgent to strengthen the scale and quality of sewage treatment. At the same time, global warming has caused frequent heavy rains in the rainy season, and urban runoff pollution has become increasingly serious, thereby aggravating overflow pollution, thus posing a major challenge to urban sewage treatment.

[0003] In municipal sewage treatment plants, although the denitrification and phosphorus removal processes have achieved certain results in application, there are still some shortcomings, such as: the competitive relationship between denitrification and phosphorus removal for carbon sources, the complex system and precise control of biological processes, and the instability of sludge activity. The traditional nitrification and denitrification denitrification technology requires huge aeration energy consumption and carbon source consumption during the treatment process, resulting in high energy consumption and high carbon emissions; while chemical phosphorus removal requires the addition of chemicals, which increases additional treatment costs. These chemicals and energy consumption lead to high costs for municipal sewage treatment, so it is particularly important to seek a simple, efficient and stable treatment process.

[0004] Traditional biological treatment technology often has large temperature changes during the transition between seasons, which is prone to sludge expansion and sludge floating, which is mainly due to poor sludge settling performance and excessive sludge concentration. This has serious consequences: reduced treatment efficiency, increased energy consumption, and substandard effluent quality. Sewage treatment plants need to invest more funds in equipment transformation, operation and maintenance, etc. At the same time, due to the increased difficulty of sludge treatment and disposal. Therefore, effectively improving the sludge settling performance of the biological treatment system and optimizing the sludge concentration are the key tasks to ensure municipal domestic sewage treatment. Summary of the invention

[0005] In view of the defects in the prior art, the object of the present invention is to provide a device and an operating method for enhanced simultaneous denitrification and efficient phosphorus removal based on a multi-stage A / O process.

[0006] According to the present invention, a device for enhanced simultaneous denitrification and efficient phosphorus removal based on a multi-stage A / O process is provided, comprising: a water inlet device, a multi-stage A / O treatment reactor, a secondary sedimentation tank and an automatic control system, wherein the water inlet device is connected to the multi-stage A / O treatment reactor, the multi-stage A / O treatment reactor is connected to the secondary sedimentation tank, and the automatic control system controls the water inlet device, the multi-stage A / O treatment reactor and the secondary sedimentation tank respectively to perform data monitoring and adjustment management;

[0007] The sewage in the water inlet device enters the multi-stage A / O treatment reactor for denitrification and phosphorus removal. The effluent from the multi-stage A / O treatment reactor flows into the secondary sedimentation tank for mud-water separation. The sludge at the bottom of the secondary sedimentation tank is returned to the multi-stage A / O treatment reactor, and the remaining sludge in the secondary sedimentation tank is discharged into the system.

[0008] Preferably, the multi-stage A / O treatment reactor comprises anoxic zones and aerobic zones, a plurality of anoxic zones and a plurality of aerobic zones are distributed at intervals, and the guide holes of two adjacent anoxic zones and aerobic zones are connected;

[0009] The anoxic zone includes anoxic zone 1, anoxic zone 2 and anoxic zone 3, and the aerobic zone includes aerobic zone 1, aerobic zone 2 and aerobic zone 3. The anoxic zone 1, aerobic zone 1, anoxic zone 2, aerobic zone 2, anoxic zone 3 and aerobic zone 3 are connected in sequence, the water inlet device is connected through the anoxic zone 1, and the aerobic zone is connected to the secondary sedimentation tank.

[0010] Preferably, each anoxic zone is provided with a liquid surface spoiler, an internal circulation agitator and an anoxic zone monitor, the internal circulation agitator is located at the lower end of the anoxic zone, the liquid surface spoiler is located at the upper end of the anoxic zone, and the anoxic zone detector is located outside the stirring range of the internal circulation agitator; the sludge in the anoxic zone is stirred evenly by the internal circulation agitator, and the sludge is suppressed from floating by the liquid surface spoiler;

[0011] Hypoxic Zone 1 is equipped with a liquid level spoiler for Hypoxic Zone 1, a circulating agitator for Hypoxic Zone 1 and a monitor for Hypoxic Zone 1; Hypoxic Zone 2 is equipped with a liquid level spoiler for Hypoxic Zone 2, a circulating agitator for Hypoxic Zone 2 and a monitor for Hypoxic Zone 2; Hypoxic Zone 3 is equipped with a liquid level spoiler for Hypoxic Zone 3, a circulating agitator for Hypoxic Zone 3 and a monitor for Hypoxic Zone 3.

[0012] Preferably, each aerobic zone is provided with an aeration device at the bottom and an aerobic zone detector at the top, the aeration device is connected to an aeration pump via a rotor flow meter, and the aeration pump is electrically connected to an automatic control system;

[0013] Aerobic zone 1 is equipped with an aerobic zone 1 aeration device and an aerobic zone 1 monitor, aerobic zone 2 is equipped with an aerobic zone 2 aeration device and an aerobic zone 2 monitor, and aerobic zone 3 is equipped with an aerobic zone 3 aeration device and an aerobic zone 3 monitor.

[0014] Preferably, the DO of aerobic zone 1 is controlled at 0.3-1 mg / L by a rotor flowmeter, the DO of aerobic zone 2 is controlled at 0.5-1.5 mg / L by a rotor flowmeter, and the DO of aerobic zone 3 is controlled at 2-4 mg / L by a rotor flowmeter.

[0015] Preferably, the secondary sedimentation tank comprises a secondary sedimentation tank water tank, a sludge return pump, a secondary sedimentation tank monitoring instrument and a secondary sedimentation tank backwash system, the anoxic zone is connected to the secondary sedimentation tank water tank through an overflow pipe, the bottom of the secondary sedimentation tank water tank is respectively connected to the sludge return pump and the secondary sedimentation tank backwash system, the secondary sedimentation tank monitoring instrument is installed inside the secondary sedimentation tank water tank, and the secondary sedimentation tank monitoring instrument is electrically connected to the automatic control system;

[0016] The secondary sedimentation tank backwash system is connected to recycled water / tap water through a backwash pump, and the secondary sedimentation tank backwash system adjusts the backwash intensity and frequency through real-time monitoring of the secondary sedimentation tank water pool by the secondary sedimentation tank monitoring instrument.

[0017] Preferably, the water inlet device comprises a municipal sewage tank and a water inlet pump, and the municipal sewage tank is connected to the anoxic zone via the water inlet pump.

[0018] Preferably, the automatic control system includes an automatic control electrical distribution box, which controls the connection of the water inlet pump, the liquid level spoiler of the anoxic zone 1, the circulating stirrer in the anoxic zone 1, the monitor of the anoxic zone 1, the aeration device of the aerobic zone 1, the monitor of the aerobic zone 1, the liquid level spoiler of the anoxic zone 2, the circulating stirrer in the anoxic zone 2, the monitor of the anoxic zone 2, the aeration device of the aerobic zone 2, the monitor of the aerobic zone 2, the liquid level spoiler of the anoxic zone 3, the circulating stirrer in the anoxic zone 3, the monitor of the anoxic zone 3, the aeration device of the aerobic zone 3, the monitor of the anoxic zone 3 and the aeration pump.

[0019] The present invention also provides an operation method of a device for enhancing simultaneous denitrification and efficient phosphorus removal based on a multi-stage A / O process, comprising the following specific operation steps:

[0020] S1. Turn on the equipment and control the hydraulic retention time, water inlet ratio and external reflux ratio of the anoxic zone through the automatic control electric distribution box;

[0021] S2. Municipal sewage in the municipal domestic sewage tank enters the anoxic zone through the water inlet pump. The sewage in the anoxic zone and the external return sludge pass through multiple anoxic zones and multiple aerobic zones in turn for nitrogen and phosphorus removal;

[0022] S3. The effluent from the aerobic zone flows into the secondary sedimentation tank through the overflow pipe for mud-water separation. The sludge at the bottom of the secondary sedimentation tank is returned to the anoxic zone through the sludge return pump, and the remaining sludge in the secondary sedimentation tank is discharged from the system through the sludge discharge pipe.

[0023] Preferably, the return ratio of the sludge at the bottom of the secondary sedimentation tank is 80%-150%.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The present invention optimizes the sludge activity of the system by backwashing the secondary sedimentation tank, realizes short-range nitrification and denitrification under low DO mode, rationally distributes carbon sources to achieve synchronous denitrification, and the total synchronous denitrification rate can reach more than 60%;

[0026] (2) The internal circulation stirring and liquid surface spoiler of the present invention inhibit the floating of sludge in the anoxic zone, and at the same time, the low DO improves the carbon source utilization of PAOs, achieving efficient phosphorus release and absorption. The TP of the effluent from the secondary sedimentation tank can be as low as 0.1 mg / L, which greatly saves the cost of phosphorus removal agents;

[0027] (3) The present invention effectively regulates the sludge settling property and sludge activity of the system through backwashing of the secondary sedimentation tank, inhibits sludge floating and swelling, curbs sludge running in the secondary sedimentation tank, and effectively reduces the desludge treatment cost;

[0028] (4) The operation method of the present invention can effectively deal with severe overflow pollution during the flood season, can stably operate for one week under an excess water load (150%), and does not require the addition of a carbon source, showing strong system operation stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0030] Figure 1 It is a schematic diagram of the connection relationship of the present invention.

[0031] The figure shows: 1.1—municipal sewage tank; 1.2—water inlet pump; 2.1—anoxic zone 1; 2.2—liquid level spoiler in anoxic zone 1; 2.3—circulating agitator in anoxic zone 1; 2.4—monitor in anoxic zone 1; 2.5—aerobic zone 1; 2.6—aeration device in aerobic zone 1; 2.7—monitor in aerobic zone 1; 2.8—anoxic zone 2; 2.9—liquid level spoiler in anoxic zone 2; 2.10—circulating agitator in anoxic zone 2; 2.11—monitor in anoxic zone 2; 2.12—aerobic zone 2; 2.13—aerobic zone 2 Zone aeration device; 2.14—Aerobic Zone 2 monitor; 2.15—Anoxic Zone 3; 2.16—Anoxic Zone 3 liquid level spoiler; 2.17—Anoxic Zone 3 internal circulation agitator; 2.18—Anoxic Zone 3 monitor; 2.19—Aerobic Zone 3; 2.20—Aerobic Zone 3 aeration device; 2.21—Aerobic Zone 3 monitor; 2.22—Aeration pump; 3.1—Secondary sedimentation tank; 3.2—Sludge return pump; 3.3—Secondary sedimentation tank monitor; 3.4—Sludge backwash system; 4-Automatic control system; 4.1—Automatic electric distribution box. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0033] Example 1

[0034] According to the present invention, a device for enhancing simultaneous denitrification and efficient phosphorus removal based on a multi-stage A / O process is provided, such as Figure 1 As shown, it includes: a water inlet device 1, a multi-stage A / O treatment reactor 2, a secondary sedimentation tank 3 and an automatic control system 4. The water inlet device 1 is connected to the multi-stage A / O treatment reactor 2, the multi-stage A / O treatment reactor 2 is connected to the secondary sedimentation tank 3, and the automatic control system 4 controls the water inlet device 1, the multi-stage A / O treatment reactor 2 and the secondary sedimentation tank 3 respectively to perform data monitoring and adjustment management; the sewage in the water inlet device 1 enters the multi-stage A / O treatment reactor 2 for denitrification and phosphorus removal, the effluent of the multi-stage A / O treatment reactor 2 flows into the secondary sedimentation tank 3 for mud and water separation, the sludge at the bottom of the secondary sedimentation tank 3 is respectively returned to the multi-stage A / O treatment reactor 2, and the remaining sludge in the secondary sedimentation tank 3 is discharged from the system.

[0035] The multi-stage A / O treatment reactor 2 includes an anoxic zone and an aerobic zone, wherein a plurality of anoxic zones and a plurality of aerobic zones are distributed at intervals, and the guide holes of two adjacent anoxic zones and aerobic zones are connected. A liquid level spoiler, an internal circulation agitator and an anoxic zone monitor are provided in the anoxic zone, the internal circulation agitator is located at the lower end of the anoxic zone, the liquid level spoiler is located at the upper end of the anoxic zone, and the anoxic zone detector is located outside the stirring range of the internal circulation agitator; the sludge in the anoxic zone is stirred evenly by the internal circulation agitator, and the sludge is suppressed from floating by the liquid level spoiler. An aeration device is provided at the bottom of the aerobic zone, and an aerobic zone detector is provided at the upper end of the aerobic zone. The aeration device is connected to the aeration pump 2.22 through a rotor flowmeter, and the aeration pump 2.22 is electrically connected to the automatic control system 4.

[0036] The water inlet device 1 includes a municipal sewage tank 1.1 and an inlet pump 1.2, and the municipal sewage tank 1.1 is connected to the anoxic zone 1 2.1 through the inlet pump 1.2. The secondary sedimentation tank 3 includes a secondary sedimentation tank pool 3.1, a sludge return pump 3.2, a secondary sedimentation tank monitoring instrument 3.3 and a secondary sedimentation tank backwash system 3.4. The anoxic zone 3 2.15 is connected to the secondary sedimentation tank pool 3.1 through an overflow pipe, and the bottom of the secondary sedimentation tank pool 3.1 is respectively connected to the sludge return pump 3.2 and the secondary sedimentation tank backwash system 3.4, and the secondary sedimentation tank monitoring instrument 3.3 is installed inside the secondary sedimentation tank pool 3.1, and the secondary sedimentation tank monitoring instrument 3.3 is electrically connected to the automatic control system 4; the secondary sedimentation tank backwash system 3.4 is connected to recycled water / tap water through a backwash pump, and the secondary sedimentation tank backwash system 3.4 adjusts the backwash intensity and frequency through the real-time monitoring of the secondary sedimentation tank pool 3.1 by the secondary sedimentation tank monitoring instrument 3.3.

[0037] More specifically, the secondary sedimentation tank backwash and internal circulation stirring system adjustment: the secondary sedimentation tank 3 is monitored in real time through the secondary sedimentation tank monitoring instrument 3.3, and the backwash system 3.4 is effectively opened in real time to regulate the return sludge flow, concentration and pollutant concentration of the secondary sedimentation tank, optimize the return sludge concentration, return activity (NO3- -N and TP), control the denitrification and phosphorus removal activity of the reactor sludge, cultivate dominant bacteria, improve the sludge settling performance, and effectively inhibit the sludge from floating; at the same time, the internal circulation stirring in the anoxic zone makes the sludge react evenly and fully, and the liquid surface spoiler inhibits the sludge from floating and inhibits the sludge from swelling.

[0038] Municipal domestic sewage first enters the water inlet device 1, and then enters the multi-stage A / O treatment reactor 2 to achieve efficient removal of carbon, nitrogen and phosphorus through biological treatment. By optimizing the stirring method and the control of the reflux system, the enrichment of short-range nitrification and denitrification, aerobic simultaneous denitrification and efficient phosphorus removal bacteria can be achieved. Based on the above device, according to the actual operation experience and regulation method, the purpose of deep denitrification and phosphorus removal of municipal domestic sewage can be achieved, and the overflow pollution treatment of the super-influent load in the flood season and rainy season can be realized at the same time. It is suitable for municipal domestic sewage treatment, integrated biological treatment equipment and flood season township overflow pollution control treatment. It does not require external carbon source and phosphorus removal agent, and effectively reduces aeration intensity, with the characteristics of energy saving and consumption reduction.

[0039] Example 2

[0040] This Example 2 is completed on the basis of Example 1, and mainly further describes the multi-stage A / O treatment reactor 2, specifically:

[0041] The anoxic zone includes anoxic zone 1 2.1, anoxic zone 2.8 and anoxic zone 3 2.15, and the aerobic zone includes aerobic zone 1 2.5, aerobic zone 2.12 and aerobic zone 3 2.19. The anoxic zone 1 2.1, aerobic zone 1 2.5, anoxic zone 2.8, aerobic zone 2.12, anoxic zone 3 2.15 and aerobic zone 3 2.19 are connected in sequence, and the water inlet device 1 is connected through the anoxic zone 1 2.1, and the aerobic zone 3 2.19 is connected to the secondary sedimentation tank 3.

[0042] The hypoxic zone 1 2.1 is provided with a hypoxic zone 1 liquid level spoiler 2.2, a hypoxic zone 1 internal circulation stirrer 2.3 and a hypoxic zone 1 monitor 2.4; the hypoxic zone 2 2.8 is provided with a hypoxic zone 2 liquid level spoiler 2.9, a hypoxic zone 2 internal circulation stirrer 2.10 and a hypoxic zone 2 monitor 2.11; the hypoxic zone 3 2.15 is provided with a hypoxic zone 3 liquid level spoiler 2.16, a hypoxic zone 3 internal circulation stirrer 2.17 and a hypoxic zone 3 monitor 2.18.

[0043] Aerobic zone 1 2.5 is provided with aerobic zone 1 aeration device 2.6 and aerobic zone 1 monitor 2.7, aerobic zone 2 2.12 is provided with aerobic zone 2 aeration device 2.13 and aerobic zone 2 monitor 2.14, and aerobic zone 3 2.19 is provided with aerobic zone 3 aeration device 2.20 and aerobic zone 3 monitor 2.21. Aerobic zone 1 2.5 is controlled to 0.3-1 mg / L by a rotor flowmeter, aerobic zone 2 2.12 is controlled to 0.5-1.5 mg / L by a rotor flowmeter, and aerobic zone 3 2.19 is controlled to 2-4 mg / L by a rotor flowmeter.

[0044] The automatic control system 4 comprises an automatic control electric distribution box 4.1, which controls the water inlet pump 1.2, the hypoxic zone 1 liquid level spoiler 2.2, the hypoxic zone 1 internal circulation stirrer 2.3, the hypoxic zone 1 monitor 2.4, the aerobic zone 1 aeration device 2.6, the aerobic zone 1 monitor 2.7, the hypoxic zone 2 liquid level spoiler 2.9, the hypoxic zone 2 internal circulation stirrer 2.10, the hypoxic zone 2 monitor 2.11, the aerobic zone 2 aeration device 2.13, the aerobic zone 2 monitor 2.14, the hypoxic zone 3 liquid level spoiler 2.16, the hypoxic zone 3 internal circulation stirrer 2.17, the hypoxic zone 3 monitor 2.18, the aerobic zone 3 aeration device 2.20, the aerobic zone 3 monitor 2.21 and the aeration pump 2.22.

[0045] Example 3

[0046] The present invention also provides an operation method of the device for enhancing simultaneous denitrification and efficient phosphorus removal based on the multi-stage A / O process in Example 1 or Example 2, such as Figure 1 As shown, the specific steps are as follows:

[0047] S1. Inoculate the biochemical sludge of the municipal sewage plant in the multi-stage A / O treatment reactor, and the sludge concentration is 3000-4000 mg / L; control the hydraulic retention time of the anoxic zone 1 2.1 to 1.5-2.5h, and the retention time ratio of the anoxic zone 1 2.1, the anoxic zone 2.8 and the anoxic zone 3 2.15 is 1:1.3:1.6; control the sludge concentration of each zone by controlling the water inlet ratio, return sludge concentration and sludge age of each anoxic zone; control the external return ratio to 80%-150%;

[0048] S2, the sewage in the municipal domestic sewage tank 1.1 enters the anoxic zone 1 2.1 through the water inlet pump 1.2. In the anoxic zone 1 2.1, NO3 in the external return sludge - -N concentration is 2-10mg / L, and anaerobic ammonia oxidizing bacteria (Anammox) convert the remaining NH4 + -N and NO2 - -N is reduced to N2 and produces NO3 - -N, accompanied by denitrifying bacteria absorbing carbon sources to convert NO3- -N is reduced to N2, while polyphosphate bacteria release PO4 3- -P, denitrifying phosphorus-accumulating bacteria utilize NO3 - -N is an electron acceptor for PO4 3 -P is removed to achieve simultaneous nitrogen and phosphorus removal;

[0049] Then the municipal sewage flows into the aerobic zone 1 2.5 through the diversion hole, and the flow meter is adjusted to control the DO to 0.3-1mg / L. The aerobic ammonia oxidizing bacteria and nitrifying bacteria convert NH4 + -N is oxidized to NO2 - -N and NO3 - -N, nitrite accumulation rate is 20%-50%, NH4 + -N concentration is 1-10mg / L, the simultaneous denitrification rate can reach 30%-70%, and polyphosphate bacteria convert PO4 3- -P is removed to less than 0.5-1.5mg / L, achieving simultaneous nitrogen and phosphorus removal;

[0050] The wastewater then flows into the anoxic zone 2.8, where Anammox converts the remaining NH4 + -N and NO2 - -N is reduced to N2 and produces NO3 - -N, and denitrifying bacteria absorb carbon sources to convert NO3 - -N is reduced to N2, while polyphosphate bacteria release PO4 3- -P, denitrifying phosphorus-accumulating bacteria utilize NO3 - -N is an electron acceptor for PO4 3 -P is removed to achieve simultaneous nitrogen and phosphorus removal;

[0051] Through the diversion hole into the aerobic zone 2.12, control its DO to 0.5-1.5mg / L, unstable short-range nitrification to NH4 + -N is oxidized to NO2-N and NO3-N, with a nitrite accumulation rate of 20%-40%, and NH4 + -N concentration is 1-8mg / L, the simultaneous denitrification rate can reach 20%-60%, and polyphosphate bacteria convert PO4 3- -P is removed to less than 0.1-1 mg / L, achieving simultaneous nitrogen and phosphorus removal;

[0052] Then the sewage flows into the anoxic zone 3 2.15, where denitrifying bacteria absorb carbon sources and convert NO3 - -N is reduced to N2, while polyphosphate bacteria release PO4 3- -P, while denitrifying polyphosphate bacteria utilize NO3 - -N is an electron acceptor for PO4 3- -P removal, achieving simultaneous nitrogen and phosphorus removal;

[0053] Through the diversion hole into the aerobic zone 3 2.19, control its DO to 2-4mg / L to ensure NH4 + -N is oxidized to NO3 - -N, NH4 + -N concentration is 0.1-1mg / L, TN concentration is 5-10mg / L, polyphosphate bacteria convert PO4 3- -P is removed to less than 0.1-0.5 mg / L, thus completing deep nitrogen and phosphorus removal;

[0054] S3, the effluent flows into the secondary sedimentation tank 3 through the overflow pipe to complete the mud-water separation; the sludge at the bottom of the secondary sedimentation tank 3 is returned to the anoxic zone 1 2.1 of the reactor through the reflux pump 3.2, and the reflux ratio is 100%-150%; the remaining sludge is discharged from the system through the sludge discharge pipe, and the sludge age is controlled to be 15-20 days; daily operation of the secondary sedimentation tank effluent: TN≤10mg / L, NH4 + -N≤1mg / L, TP≤0.3mg / L, COD≤25mg / L;

[0055] S4. Entering the flood season, in order to actively respond to and effectively control overflow pollution and improve water ecological quality, the municipal sewage treatment plant needs to be able to operate stably at short-term overload. The influent concentration during the flood season is: TN≤20mg / L, NH4 + -N≤20mg / L, TP≤2mg / L, COD≤100mg / L; flood season water load 120%-150%, continuous operation time 5-10d; by adjusting the external return flow to 100%-150%, and ensure that the water ratio of the anoxic zone 1 is ≥50%; the effluent quality of the secondary sedimentation tank: TN≤10mg / L, NH4 + -N≤0.5mg / L, TP≤0.3mg / L, COD≤20mg / L.

[0056] More specifically, the experimental influent is the pre-treated effluent from the municipal domestic sewage plant, and the daily operating water quality is as follows: TN concentration is 45-70 mg / L, NH4 + -N concentration is 40-65mg / L, TP concentration is 3.6-6.5mg / L, COD concentration is 170-300mg / L, NO2 - -N concentration ≤ 0.3mg / L, NO3 - -N concentration ≤ 0.8mg / L, pH 7.4-8.1; the water inflow during flood season is as follows: TN concentration 14-21mg / L, NH4 + -N concentration is 10-18mg / L, TP concentration is 0.8-2.1mg / L, COD concentration is 72-110mg / L, NO2 - -N concentration ≤ 0.1mg / L, NO3 --N concentration ≤ 0.3 mg / L, pH 7.1-7.5. The experimental device is made of stainless steel, and the effective volume of the multi-stage A / O reactor is 15.0 m 3 , the effective volume of the secondary sedimentation tank is 2.4m 3 .

[0057] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0058] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A device for intensified simultaneous denitrification and efficient phosphorus removal based on a multi-stage A / O process, characterized in that: include: A water inlet device (1), a multi-stage A / O treatment reactor (2), a secondary sedimentation tank (3) and an automatic control system (4), wherein the water inlet device (1) is connected to the multi-stage A / O treatment reactor (2), the multi-stage A / O treatment reactor (2) is connected to the secondary sedimentation tank (3), and the automatic control system (4) controls the water inlet device (1), the multi-stage A / O treatment reactor (2) and the secondary sedimentation tank (3) respectively to perform data monitoring and adjustment management; The sewage in the water inlet device (1) enters the multi-stage A / O treatment reactor (2) for nitrogen and phosphorus removal, the effluent of the multi-stage A / O treatment reactor (2) flows into the secondary sedimentation tank (3) for mud and water separation, the sludge at the bottom of the secondary sedimentation tank (3) is returned to the multi-stage A / O treatment reactor (2), and the remaining sludge in the secondary sedimentation tank (3) is discharged to the system.

2. The device for intensified simultaneous denitrification and efficient phosphorus removal based on multi-stage A / O process according to claim 1 is characterized in that: The multi-stage A / O treatment reactor (2) comprises anoxic zones and aerobic zones, wherein the bacterial communities for denitrification and phosphorus removal in the multiple anoxic zones comprise Anammox, denitrifying bacteria, phosphate accumulating bacteria and denitrifying and phosphorus removing bacteria, and the bacterial communities for denitrification and phosphorus removal in the multiple aerobic zones comprise ammonia oxidizing bacteria, nitrifying bacteria and phosphate accumulating bacteria, the multiple anoxic zones and the multiple aerobic zones are distributed at intervals, and two adjacent anoxic zones and the aerobic zone are connected via a guide hole; The anoxic zone comprises anoxic zone 1 (2.1), anoxic zone 2 (2.8) and anoxic zone 3 (2.15); the aerobic zone comprises aerobic zone 1 (2.5), aerobic zone 2 (2.12) and aerobic zone 3 (2.19); the anoxic zone 1 (2.1), the aerobic zone 1 (2.5), the anoxic zone 2 (2.8), the aerobic zone 2 (2.12), the anoxic zone 3 (2.15) and the aerobic zone 3 (2.19) are sequentially connected; the water inlet device (1) is connected through the anoxic zone 1 (2.1); and the aerobic zone 3 (2.19) is connected to the secondary sedimentation tank (3).

3. The device for intensified simultaneous denitrification and efficient phosphorus removal based on multi-stage A / O process according to claim 2 is characterized in that: A liquid surface spoiler, an internal circulation agitator and an anoxic zone monitor are provided in the anoxic zone, the internal circulation agitator is located at the lower end of the anoxic zone, the liquid surface spoiler is located at the upper end of the anoxic zone, and the anoxic zone detector is located outside the stirring range of the internal circulation agitator; the sludge in the anoxic zone is stirred evenly by the internal circulation agitator, and the sludge is prevented from floating by the liquid surface spoiler; The hypoxic zone 1 (2.1) is provided with a hypoxic zone 1 liquid level spoiler (2.2), a hypoxic zone 1 internal circulation stirrer (2.3) and a hypoxic zone 1 monitor (2.4); the hypoxic zone 2 (2.8) is provided with a hypoxic zone 2 liquid level spoiler (2.9), a hypoxic zone 2 internal circulation stirrer (2.10) and a hypoxic zone 2 monitor (2.11); the hypoxic zone 3 (2.15) is provided with a hypoxic zone 3 liquid level spoiler (2.16), a hypoxic zone 3 internal circulation stirrer (2.17) and a hypoxic zone 3 monitor (2.18).

4. The device for intensified simultaneous denitrification and efficient phosphorus removal based on multi-stage A / O process according to claim 3 is characterized in that: An aeration device is provided at the bottom of the aerobic zone, an aerobic zone detector is provided at the upper end of the aerobic zone, the aeration device is connected to an aeration pump (2.22) via a rotor flow meter, and the aeration pump (2.22) is electrically connected to the automatic control system (4); The aerobic zone 1 (2.5) is provided with an aerobic zone 1 aeration device (2.6) and an aerobic zone 1 monitor (2.7), the aerobic zone 2 (2.12) is provided with an aerobic zone 2 aeration device (2.13) and an aerobic zone 2 monitor (2.14), and the aerobic zone 3 (2.19) is provided with an aerobic zone 3 aeration device (2.20) and an aerobic zone 3 monitor (2.21).

5. The device for intensified simultaneous denitrification and efficient phosphorus removal based on multi-stage A / O process according to claim 4 is characterized in that: The DO of the aerobic zone 1 (2.5) is controlled to be 0.3-1 mg / L by a rotor flowmeter, the DO of the aerobic zone 2 (2.12) is controlled to be 0.5-1.5 mg / L by a rotor flowmeter, and the DO of the aerobic zone 3 (2.19) is controlled to be 2-4 mg / L by a rotor flowmeter.

6. The device for intensified simultaneous denitrification and efficient phosphorus removal based on multi-stage A / O process according to claim 4 is characterized in that: The secondary sedimentation tank (3) comprises a secondary sedimentation tank water tank (3.1), a sludge return pump (3.2), a secondary sedimentation tank monitoring instrument (3.3) and a secondary sedimentation tank backwash system (3.4); the anoxic zone 3 (2.15) is connected to the secondary sedimentation tank water tank (3.1) through an overflow pipe; the bottom of the secondary sedimentation tank water tank (3.1) is respectively connected to the sludge return pump (3.2) and the secondary sedimentation tank backwash system (3.4); the secondary sedimentation tank monitoring instrument (3.3) is installed inside the secondary sedimentation tank water tank (3.1), and the secondary sedimentation tank monitoring instrument (3.3) is electrically connected to the automatic control system (4); The secondary sedimentation tank backwashing system (3.4) is connected to recycled water / tap water via a backwashing pump, and the secondary sedimentation tank backwashing system (3.4) adjusts the backwashing intensity and frequency through real-time monitoring of the secondary sedimentation tank water pool (3.1) by the secondary sedimentation tank monitoring instrument (3.3).

7. The device for intensified simultaneous denitrification and efficient phosphorus removal based on multi-stage A / O process according to claim 2, characterized in that: The water inlet device (1) comprises a municipal sewage tank (1.1) and a water inlet pump (1.2), and the municipal sewage tank (1.1) is connected to the anoxic zone 1 (2.1) via the water inlet pump (1.2).

8. The device for enhanced simultaneous denitrification and efficient phosphorus removal based on multi-stage A / O process according to claim 4 or 7, characterized in that: The automatic control system (4) comprises an automatic control electric distribution box (4.1), wherein the automatic control electric distribution box (4.1) controls and connects the water inlet pump (1.2), the hypoxic zone 1 liquid level spoiler (2.2), the hypoxic zone 1 internal circulation stirrer (2.3), the hypoxic zone 1 monitor (2.4), the aerobic zone 1 aeration device (2.6), the aerobic zone 1 monitor (2.7), the hypoxic zone 2 liquid level spoiler (2.9), the hypoxic zone 2 ... A circulating stirrer (2.10), the anoxic zone 2 monitor (2.11), the aerobic zone 2 aeration device (2.13), the aerobic zone 2 monitor (2.14), the anoxic zone 3 liquid level disruptor (2.16), the anoxic zone 3 internal circulating stirrer (2.17), the anoxic zone 3 monitor (2.18), the aerobic zone 3 aeration device (2.20), the aerobic zone 3 monitor (2.21) and the aeration pump (2.22).

9. The method for operating the device for enhancing simultaneous denitrification and efficient phosphorus removal based on the multi-stage A / O process according to any one of claims 1 to 8 is characterized in that: The specific steps are as follows: S1, start the equipment and control the hydraulic retention time, water inlet ratio and external reflux ratio of the anoxic zone through the automatic control electric distribution box (4.1); S2, the municipal sewage in the municipal domestic sewage tank (1.1) enters the anoxic zone 1 (2.1) through the water inlet pump (1.2), and the sewage and external return sludge in the anoxic zone 1 (2.1) are sequentially denitrified and dephosphorized through a plurality of the anoxic zones and a plurality of the aerobic zones; S3, the effluent from the aerobic zone 3 (2.19) flows into the secondary sedimentation tank (3.1) through an overflow pipe for mud-water separation, the sludge at the bottom of the secondary sedimentation tank (3.1) flows back to the anoxic zone 1 (2.1) through the sludge return pump (3.2), and the remaining sludge in the secondary sedimentation tank (3.1) is discharged from the system through a sludge discharge pipe.

10. The method for operating the device for intensified simultaneous denitrification and efficient phosphorus removal based on multi-stage A / O process according to claim 8, characterized in that: The return ratio of the sludge at the bottom of the secondary sedimentation tank (3.1) is 80%-150%.

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