Novel aerobic system

Abstract

The utility model provides a novel aerobic system which comprises a plurality of stages of A / O reaction tanks arranged in series, two adjacent A / O reaction tanks are communicated through an upper water passing hole arranged at the top of the side wall of a tank body, and a nitrification liquid backflow unit, a sludge backflow unit and an aeration stirring unit are respectively connected with each stage of A / O reaction tank. According to the invention, nitrification liquid, sludge and oxygen are respectively provided for each stage of A / O reaction tank, the functions of the reaction tanks can be flexibly switched and the operation modes of the multistage reaction tanks can be adjusted according to the water quantity and the water quality of sewage, the optimal treatment effect is realized, and the purpose of saving energy consumption is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a novel aerobic system. Background Art

[0002] Factory production has off-seasons and peak seasons, and the amount of wastewater and water quality generated are always fluctuating and vary greatly. Aerobic treatment systems are usually designed according to the maximum treatment capacity. During the off-season, the amount of wastewater is small and the concentration of pollutants in the water is low, but the wastewater is still purified in the aerobic system with inherent treatment capacity, resulting in poor wastewater treatment effect, high suspended solids in the effluent, and high energy consumption.

[0003] Therefore, there is an urgent need for an aerobic system with flexible adjustment of operation mode. During the peak production season, all aerobic system equipment is operated to treat sewage. During the off-season, the processing capacity of the aerobic system can be reduced to achieve energy saving and consumption reduction and optimize the effluent water quality. Utility Model Content

[0004] In view of the above technical problems, the purpose of the utility model is to provide a novel aerobic system, including multiple A / O reaction tanks arranged in series, two adjacent A / O reaction tanks are connected through an upper water hole arranged on the top of the side wall of the tank body, and the nitrification liquid reflux unit, the sludge reflux unit, and the aeration and stirring unit are respectively connected to the A / O reaction tanks at each level to provide nitrification liquid, sludge and oxygen to the A / O reaction tanks at each level respectively. According to the water volume and water quality of the sewage, the function of the reaction tank can be flexibly switched and the operation mode of the multi-stage reaction tank can be adjusted to achieve the best treatment effect and achieve the purpose of saving energy consumption.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A novel aerobic system comprises: A / O reaction tanks arranged in series in multiple stages, sewage inlet pipes, nitrification liquid reflux units, sludge reflux units, aeration and stirring units and a control unit respectively connected to the A / O reaction tanks; an upper water through hole is provided on the top of the side wall of the A / O reaction tank, and two adjacent A / O reaction tanks are connected through the upper water through hole; the nitrification liquid reflux unit, the sludge reflux unit and the aeration and stirring unit are used to provide the A / O reaction tanks with nitrification liquid, sludge and oxygen respectively; and the control unit is electrically connected to the nitrification liquid reflux unit, the sludge reflux unit and the aeration and stirring unit respectively.

[0007] In some embodiments, the A / O reaction tank is provided with a nitrating liquid inlet; the nitrating liquid reflux unit comprises: a nitrating liquid reflux pipeline, a nitrating liquid reflux automatic control valve and a nitrating liquid reflux pump arranged on the nitrating liquid reflux pipeline; the nitrating liquid reflux pipeline is connected to the nitrating liquid inlet; the nitrating liquid reflux automatic control valve and the nitrating liquid reflux pump are both electrically connected to the control unit.

[0008] In some embodiments, the A / O reaction tank is provided with a sludge inlet; the sludge return unit includes a sludge return pipeline, a sludge return automatic control valve and a sludge return pump arranged on the sludge return pipeline; the sludge return pipeline is connected to the sludge inlet; the sludge return automatic control valve and the sludge return pump are both electrically connected to the control unit.

[0009] In some embodiments, the aeration and stirring unit includes: a jet pipeline, an aeration pipeline, and a jet aerator disposed in the A / O reaction tank; the jet pipeline and the aeration pipeline are both connected to the jet aerator.

[0010] In some embodiments, a jet pump is provided on the jet pipeline; a variable frequency blower is provided on the aeration pipeline; and both the jet pump and the variable frequency blower are electrically connected to the control unit.

[0011] In some embodiments, a partition plate is provided in the A / O reaction pool, and the partition plate is used to divide the inner cavity of the A / O reaction pool into two reaction chambers; a lower water hole connecting the two reaction chambers is provided at the bottom of the partition plate.

[0012] In some embodiments, the A / O reaction cell comprises at least four stages.

[0013] In some embodiments, the A / O reaction tank is provided with a sewage inlet; an automatic water inlet valve is provided on the pipeline connecting the sewage inlet pipe and the sewage inlet; and the automatic water inlet valve is electrically connected to the control unit.

[0014] In some embodiments, an upper water passage gate is provided at the upper water passage hole.

[0015] In some embodiments, a water outlet is provided at the top of the side wall of the last-stage A / O reaction tank.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The novel aerobic system provided by the utility model is provided with a plurality of A / O reaction tanks with switchable operation modes. According to the different sewage water volume and water quality, the functions of the reaction tanks (anaerobic / anoxic / aerobic) can be flexibly adjusted, the operation modes can be freely switched, and the most suitable treatment mode can be selected, so as to ensure the effluent water quality and achieve the purpose of saving energy consumption. Moreover, the novel aerobic system also has the advantages of high degree of automation, stable operation and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 A schematic diagram of the structure of a novel aerobic system in one embodiment of the utility model;

[0020] Figure 2 This is a schematic structural diagram of a novel aerobic system in another embodiment provided by the utility model.

[0021] The meanings of the symbols in the accompanying drawings are as follows:

[0022] 1—nitrification liquid reflux pipeline; 11—nitrification liquid reflux pump;

[0023] 21—first-stage nitrification liquid reflux automatic control valve; 22—second-stage nitrification liquid reflux automatic control valve; 23—third-stage nitrification liquid reflux automatic control valve; 24—fourth-stage nitrification liquid reflux automatic control valve;

[0024] 3—sludge return pipeline; 31—sludge return pump;

[0025] 41—first-stage sludge return automatic control valve; 42—second-stage sludge return automatic control valve; 43—third-stage sludge return automatic control valve; 44—fourth-stage sludge return automatic control valve;

[0026] 51—first-stage jet aerator; 52—second-stage jet aerator; 53—third-stage jet aerator; 54—fourth-stage jet aerator;

[0027] 61—first-stage jet pump; 62—second-stage jet pump; 63—third-stage jet pump; 64—fourth-stage jet pump;

[0028] 71—first-stage variable frequency blower; 72—second-stage variable frequency blower; 73—third-stage variable frequency blower; 74—fourth-stage variable frequency blower;

[0029] 81—Level 1 upper water tunnel; 82—Level 2 upper water tunnel; 83—Level 3 upper water tunnel;

[0030] 91—first-level upper water tunnel gate; 92—second-level upper water tunnel gate; 93—third-level upper water tunnel gate;

[0031] 101—Level 1 bottom water tunnel; 102—Level 2 bottom water tunnel; 103—Level 3 bottom water tunnel; 104—Level 4 bottom water tunnel;

[0032] 110—Sewage inlet pipe;

[0033] 111—first-stage water inlet automatic control valve; 112—second-stage water inlet automatic control valve; 113—third-stage water inlet automatic control valve; 114—fourth-stage water inlet automatic control valve;

[0034] 100—first-level A / O reaction pool; 200—second-level A / O reaction pool; 300—third-level A / O reaction pool; 400—fourth-level A / O reaction pool. DETAILED DESCRIPTION

[0035] The present invention is further explained in detail below in conjunction with the drawings and descriptions of specific embodiments. However, the following descriptions including the embodiments are only intended to enable ordinary technicians in the technical field to which the present invention belongs to more clearly understand the principles and essence of the present invention, and do not mean any form of limitation on the present invention.

[0036] Example 1

[0037] like Figure 1 As shown, this embodiment provides a novel aerobic system, comprising:

[0038] A / O reaction tanks are arranged in series in multiple stages, sewage inlet pipes 110 connected to the A / O reaction tanks respectively, nitrification liquid reflux units, sludge reflux units, aeration stirring units and control units.

[0039] A / O reaction tank means that the function of the tank can be switched. It can be used as an A tank (anaerobic tank / anoxic tank) or an O tank (aerobic tank).

[0040] The A / O reaction tank is provided with a sewage inlet, which is preferably arranged near the top of the tank body, and a water inlet automatic control valve is provided on the pipeline connecting the sewage inlet pipe 110 and the sewage inlet.

[0041] An upper water hole is provided on the top of the side wall of the A / O reaction tank, and two adjacent A / O reaction tanks are connected through the upper water hole. Preferably, an upper water hole gate is also provided at the upper water hole.

[0042] A sludge inlet is provided at the bottom of the A / O reaction tank, and a nitrification liquid inlet is provided at the top of the A / O reaction tank.

[0043] The above-mentioned nitrification liquid reflux unit is used to provide nitrification liquid for the A / O reaction tank, including: a nitrification liquid reflux pipeline 1, a nitrification liquid reflux automatic control valve and a nitrification liquid reflux pump 11. The nitrification liquid reflux pipeline 1 is connected to the nitrification liquid inlet of each A / O reaction tank, the nitrification liquid reflux pump 11 is arranged on the nitrification liquid reflux pipeline 1, and a nitrification liquid reflux automatic control valve is provided on the pipeline connecting the nitrification liquid reflux pipeline 1 and each nitrification liquid inlet.

[0044] The above-mentioned sludge return unit is used to provide sludge for the A / O reaction tank, and includes a sludge return pipeline 3 , a sludge return automatic control valve and a sludge return pump 31 .

[0045] The sludge return pipeline 3 is connected to the sludge inlet of each A / O reaction tank, and the sludge in the secondary sedimentation tank (or final sedimentation tank) of the subsequent section is transported to each A / O reaction tank through the sludge return pipeline. The sludge return pump 31 is arranged on the sludge return pipeline 3, and a sludge return automatic control valve is provided on the pipeline connecting the sludge return pipeline 3 and each sludge inlet.

[0046] The aeration and stirring unit comprises: a jet pipeline, an aeration pipeline and a jet aerator arranged in the A / O reaction tank.

[0047] The jet pipeline and the aeration pipeline are both connected to the jet aerator to respectively deliver high-pressure water and oxygen (or air) to the jet aerator.

[0048] The jet pipeline is provided with a jet pump, and the aeration pipeline is provided with a variable frequency blower.

[0049] One of the functions of the aeration and stirring unit is to provide sufficient oxygen (or air) for the A / O reaction tank. The high-pressure water flow in the jet pipeline is pumped into the jet aerator through the jet pump, and at the same time, the oxygen (or air) is sent into the jet aerator through the aeration pipeline. The high-speed moving water flow absorbs oxygen into the water to form bubbles, and fully dissolves oxygen into the water to expand the water area, thereby rapidly increasing the oxygen content in the water and promoting the oxidation and decomposition reaction of organic matter in the water.

[0050] Another function of the aeration stirring unit is to use jets to achieve stirring and mixing, so that the sludge remains suspended and evenly distributed, thereby improving the processing capacity of the A / O reaction tank.

[0051] In some embodiments, in order to avoid the problem of short-circuiting in the A / O reaction pool leading to poor treatment effect, a partition plate is provided in the A / O reaction pool, and the partition plate divides the inner cavity of the A / O reaction pool into two reaction chambers. A lower water hole connecting the two reaction chambers is provided at the bottom of the partition plate.

[0052] The above-mentioned short flow refers to the fact that the sewage does not flow according to the designed path during the treatment process, but chooses a shorter path, causing part of the water flow to bypass the treatment unit that it should pass through, thus failing to achieve the expected treatment effect. For example, the sewage enters the A / O reaction tank from the sewage inlet, and does not react with the sludge settled at the bottom of the A / O reaction tank, but flows directly out from the upper water hole. This phenomenon leads to a decrease in water treatment efficiency and affects the final treatment effect.

[0053] In some embodiments, a water outlet is provided on the top of the side wall of the last-stage A / O reaction tank. It should be noted that each A / O reaction tank may be provided with a water outlet, which may be provided as required according to the operation of the aerobic system.

[0054] In some embodiments, the control unit is electrically connected to the nitrification liquid reflux unit, the sludge reflux unit, and the aeration and stirring unit, respectively, to control the operating state of the entire novel aerobic system.

[0055] Specifically: the control unit includes a controller, the above-mentioned water inlet automatic control valve, nitrification liquid reflux automatic control valve, nitrification liquid reflux pump, sludge reflux automatic control valve, sludge reflux pump, jet pump, variable frequency blower and upper water passage valve are electrically connected, the above-mentioned various valve components and pump bodies are all electronically controlled, and the controller controls the operating status of the above-mentioned pumps and valve components according to the set program.

[0056] The control unit also includes a display, which is connected to the output end of the controller and is used to display data information output by the controller, including but not limited to the operating status of various devices, pumps, valve bodies and other components, so that the operator can always observe the operating process of the new aerobic system from the display screen, and can also directly set the operating parameters of the new aerobic system on the display, such as the opening and closing of each pump and valve body.

[0057] Example 2

[0058] Based on the above embodiments, this embodiment provides a specific implementation of the novel aerobic system. Figure 1 and Figure 2 As shown, the A / O reaction pool is provided with at least four levels. This embodiment takes four levels as an example. Specifically:

[0059] The novel aerobic system is designed based on the worst factory wastewater quality and the greatest hydraulic power, and is provided with a primary A / O reaction tank 100, a secondary A / O reaction tank 200, a tertiary A / O reaction tank 300 and a quaternary A / O reaction tank 400 which are connected in sequence.

[0060] A first-level upper water passage 81, a second-level upper water passage 82 and a third-level upper water passage 83 are respectively provided at the top of the side wall of the first-level A / O reaction pool 100, the top of the side wall of the second-level A / O reaction pool 200 and the top of the side wall of the third-level A / O reaction pool 300, and a first-level upper water passage gate 91, a second-level upper water passage gate 92 and a third-level upper water passage gate 93 are respectively provided at the first-level upper water passage 81, the second-level upper water passage 82 and the third-level upper water passage 83.

[0061] The primary A / O reaction pool 100 and the secondary A / O reaction pool 200 are connected via a primary upper water hole 81, the secondary A / O reaction pool 200 and the tertiary A / O reaction pool 300 are connected via a secondary upper water hole 82, the tertiary A / O reaction pool 300 and the quaternary A / O reaction pool 400 are connected via a tertiary upper water hole 83, and the quaternary upper water hole provided on the top of the side wall of the quaternary A / O reaction pool 400 can be used as a water outlet.

[0062] A partition is provided in each of the primary A / O reaction pool 100, the secondary A / O reaction pool 200, the tertiary A / O reaction pool 300 and the quaternary A / O reaction pool 400 to divide the inner cavity of each A / O reaction pool into two reaction chambers. A primary bottom water hole 101 is provided at the bottom of the partition in the primary A / O reaction pool 100, a secondary bottom water hole 102 is provided at the bottom of the partition in the secondary A / O reaction pool 200, a tertiary bottom water hole 103 is provided at the bottom of the partition in the tertiary A / O reaction pool 300, and a fourth bottom water hole 104 is provided at the bottom of the partition in the fourth A / O reaction pool 400.

[0063] A first-level water inlet automatic control valve 111, a second-level water inlet automatic control valve 112, a third-level water inlet automatic control valve 113 and a fourth-level water inlet automatic control valve 114 are respectively provided on the pipelines connecting the sewage inlet pipe 110 with the first-level A / O reaction tank 100, the second-level A / O reaction tank 200, the third-level A / O reaction tank 300 and the fourth-level A / O reaction tank 400.

[0064] A first-level nitrifying liquid reflux automatic valve 21, a second-level nitrifying liquid reflux automatic valve 22, a third-level nitrifying liquid reflux automatic valve 23 and a fourth-level nitrifying liquid reflux automatic valve 24 are respectively provided on the pipeline connecting the nitrifying liquid reflux pipeline 1 with the first-level A / O reaction tank 100, the second-level A / O reaction tank 200, the third-level A / O reaction tank 300 and the fourth-level A / O reaction tank 400.

[0065] The pipelines connecting the sludge return pipeline 3 with the primary A / O reaction tank 100, the secondary A / O reaction tank 200, the tertiary A / O reaction tank 300 and the quaternary A / O reaction tank 400 are respectively provided with a primary sludge return automatic valve 41, a secondary sludge return automatic valve 42, a tertiary sludge return automatic valve 43 and a quaternary sludge return automatic valve 44.

[0066] A primary jet aerator 51, a secondary jet aerator 52, a tertiary jet aerator 53, and a quaternary jet aerator 54 are respectively disposed in the primary A / O reaction tank 100, the secondary A / O reaction tank 200, the tertiary A / O reaction tank 300, and the quaternary A / O reaction tank 400.

[0067] A primary jet pump 61 , a secondary jet pump 62 , a tertiary jet pump 63 and a quaternary jet pump 64 are respectively provided on the connecting pipelines between the jet pipeline and the primary jet aerator 51 , the secondary jet aerator 52 , the tertiary jet aerator 53 and the quaternary jet aerator 54 .

[0068] A primary variable frequency blower 71, a secondary variable frequency blower 72, a tertiary variable frequency blower 73 and a quaternary variable frequency blower 74 are respectively provided on the connecting pipelines between the aeration pipeline and the primary jet aerator 51, the secondary jet aerator 52, the tertiary jet aerator 53 and the quaternary jet aerator 54.

[0069] The controller is electrically connected to the above-mentioned water tunnel gates, water inlet automatic valve, nitrification liquid return automatic valve, sludge return automatic valve, jet pump and variable frequency blower to control the overall operation of the system, which will not be repeated here.

[0070] The following is an example of the operation mode of the new aerobic system with four-stage A / O reaction tanks:

[0071] According to the water quality of the plant (the concentration of total nitrogen (TN) and total phosphorus (TP), there are two operating modes (I) and (II):

[0072] (i) When the TN and TP concentrations in the sewage are lower than the effluent requirements, the A / O reaction pool is switched to the O pool (aerobic pool), and only the COD pollutants in the water need to be removed. Then, according to the total amount of COD and the amount of water, the following four operation modes are divided into: (1) to (4):

[0073] (1) When the total COD amount and water volume are at the designed load state of 75% to 100%, the system is operated in O / O / O / O (aerobic / aerobic / aerobic / aerobic) mode, and all the first-stage A / O reaction pool 100 to the fourth-stage A / O reaction pool 400 are in operation:

[0074] The first-stage upper water tunnel gate 91 , the second-stage upper water tunnel gate 92 and the third-stage upper water tunnel gate 93 are all opened, connecting the first-stage A / O reaction pool 100 to the fourth-stage A / O reaction pool 400 .

[0075] Only the first-level water inlet automatic control valve 111 is opened, while the second-level water inlet automatic control valve 112, the third-level water inlet automatic control valve 113 and the fourth-level water inlet automatic control valve 114 are all closed.

[0076] The nitrification liquid reflux unit is closed, that is, the nitrification liquid reflux pipeline 1, the nitrification liquid reflux pump 11, the first-level nitrification liquid reflux automatic valve 21, the second-level nitrification liquid reflux automatic valve 22, the third-level nitrification liquid reflux automatic valve 23 and the fourth-level nitrification liquid reflux automatic valve 24 are all closed.

[0077] Only the sludge return pump 31 and the primary sludge return automatic valve 41 are opened to allow the sludge to return to the primary A / O reaction tank 100, while the secondary sludge return automatic valve 42, the tertiary sludge return automatic valve 43 and the quaternary sludge return automatic valve 44 are all closed.

[0078] All aeration and stirring units are turned on, that is, the first-stage jet pump 61, the second-stage jet pump 62, the third-stage jet pump 63, the fourth-stage jet pump 64, the first-stage variable frequency blower 71, the second-stage variable frequency blower 72, the third-stage variable frequency blower 73 and the fourth-stage variable frequency blower 74 are all turned on to aerate the first-stage A / O reaction tank 100 to the fourth-stage A / O reaction tank 400.

[0079] (2) When the total COD amount and the water volume are at the designed load state of 50% to 75%, the system is operated in O / O / O (aerobic / aerobic / aerobic) mode, the primary A / O reaction pool 100 stops operating, and the secondary A / O reaction pool 200 to the quaternary A / O reaction pool 400 are all operated:

[0080] Only the secondary upper water tunnel gate 92 and the tertiary upper water tunnel gate 93 are opened, only the secondary A / O reaction pool 200 is connected to the tertiary A / O reaction pool 400, and the primary upper water tunnel gate 91 is closed.

[0081] Only the secondary water inlet automatic control valve 112 is opened, while the primary water inlet automatic control valve 111, the tertiary water inlet automatic control valve 113 and the quaternary water inlet automatic control valve 114 are all closed.

[0082] The nitrification liquid reflux unit is closed, that is, the nitrification liquid reflux pipeline 1, the nitrification liquid reflux pump 11, and the first-level nitrification liquid reflux automatic control valve 21 to the fourth-level nitrification liquid reflux automatic control valve 24 are all closed.

[0083] Only the sludge return pump 31 and the secondary sludge return automatic valve 42 are turned on to allow the sludge to return to the secondary A / O reaction tank 200, while the primary sludge return automatic valve 41, the tertiary sludge return automatic valve 43 and the quaternary sludge return automatic valve 44 are all closed. It should be noted that the aeration method of the jet aerator adopted in the present invention can fully mix the sludge. Although only the secondary sludge return automatic valve 42 is turned on (the first A / O reaction tank in aerobic mode), under the action of the secondary jet aerator 52, the tertiary jet aerator 53, the quaternary jet aerator 54 and the flow of water, the sludge in the secondary A / O reaction tank 200 to the quaternary A / O reaction tank 400 can reach a completely mixed state.

[0084] Only the secondary jet pump 62, the tertiary jet pump 63, the quaternary jet pump 64, the secondary variable frequency blower 72, the tertiary variable frequency blower 73 and the quaternary variable frequency blower 74 are turned on to aerate the secondary A / O reaction pool 200 to the quaternary A / O reaction pool 400, and the primary jet pump 61 and the primary variable frequency blower 71 are turned off to stop aerating the primary A / O reaction pool 100.

[0085] (3) When the total COD amount and the water volume are at the designed load state of 25% to 50%, the system is operated in O / O (aerobic / aerobic) mode, the primary A / O reaction pool 100 and the secondary A / O reaction pool 200 are stopped, and the tertiary A / O reaction pool 300 and the quaternary A / O reaction pool 400 are operated:

[0086] Only the third-level upper water tunnel gate 93 is opened, only the third-level A / O reaction pool 200 and the fourth-level A / O reaction pool 400 are connected, and the first-level upper water tunnel gate 91 and the second-level upper water tunnel gate 92 are closed.

[0087] Only the third-level water inlet automatic control valve 113 is opened, while the first-level water inlet automatic control valve 111, the second-level water inlet automatic control valve 112 and the fourth-level water inlet automatic control valve 114 are all closed.

[0088] The nitrification liquid reflux unit is closed, that is, the nitrification liquid reflux pipeline 1, the nitrification liquid reflux pump 11, and the first-level nitrification liquid reflux automatic control valve 21 to the fourth-level nitrification liquid reflux automatic control valve 24 are all closed.

[0089] Only the sludge return pump 31 and the tertiary sludge return automatic valve 43 are opened to allow the sludge to return to the tertiary A / O reaction tank 300, while the primary sludge return automatic valve 41, the secondary sludge return automatic valve 42 and the quaternary sludge return automatic valve 44 are all closed.

[0090] Only the tertiary jet pump 63, the quaternary jet pump 64, the tertiary variable frequency blower 73 and the quaternary variable frequency blower 74 are turned on to aerate the tertiary A / O reaction pool 300 and the quaternary A / O reaction pool 400, and the primary jet pump 61, the secondary jet pump 62, the primary variable frequency blower 71 and the secondary variable frequency blower 72 are turned off to stop aerating the primary A / O reaction pool 100 and the secondary A / O reaction pool 200.

[0091] (4) When the total COD amount and the water volume are at the designed load state of 0-25%, the system is operated in O (aerobic) mode, and only the fourth-stage A / O reaction pool 400 is operated, while the first-stage A / O reaction pool 100 to the third-stage A / O reaction pool 300 are stopped:

[0092] The first-stage upper water tunnel gate 91 to the third-stage upper water tunnel gate 93 are all closed.

[0093] Only the fourth water inlet automatic control valve 114 is opened, while the first-stage water inlet automatic control valve 111 to the third-stage water inlet automatic control valve 113 are all closed.

[0094] The nitrification liquid reflux unit is closed, that is, the nitrification liquid reflux pipeline 1, the nitrification liquid reflux pump 11, and the first-level nitrification liquid reflux automatic control valve 21 to the fourth-level nitrification liquid reflux automatic control valve 24 are all closed.

[0095] Only the sludge return pump 31 and the fourth-stage sludge return automatic control valve 44 are opened to allow the sludge to return to the fourth-stage A / O reaction tank 400, while the first-stage sludge return automatic control valve 41 to the third-stage sludge return automatic control valve 43 are all closed.

[0096] Only the fourth-stage jet pump 64 and the fourth-stage variable frequency blower 74 are turned on to aerate the fourth-stage A / O reaction pool 400, and the first-stage jet pump 61 to the third-stage jet pump 63 and the first-stage variable frequency blower 71 to the third-stage variable frequency blower 73 are turned off to stop aerating the first-stage A / O reaction pool 100 to the third-stage A / O reaction pool 300.

[0097] (II) When the TN and TP concentrations in the sewage are higher than the effluent requirements, the following three operating modes are used according to the total amount of COD and the amount of water: (5) to (7):

[0098] (5) When the total COD and water volume are at the designed load state of 75% to 100%, the system operates in A / O / O / O (anaerobic / aerobic / aerobic) mode, and all the first-stage A / O reaction pool 100 to the fourth-stage A / O reaction pool 400 are in operation:

[0099] The first-stage upper water tunnel gate 91 , the second-stage upper water tunnel gate 92 and the third-stage upper water tunnel gate 93 are all opened, connecting the first-stage A / O reaction pool 100 to the fourth-stage A / O reaction pool 400 .

[0100] Only the first-level water inlet automatic control valve 111 is opened, while the second-level water inlet automatic control valve 112, the third-level water inlet automatic control valve 113 and the fourth-level water inlet automatic control valve 114 are all closed.

[0101] Only the nitrification liquid reflux pump 11 and the primary nitrification liquid reflux automatic valve 21 are opened to input the nitrification liquid into the primary A / O reaction tank 100, while the secondary nitrification liquid reflux automatic valve 22, the tertiary nitrification liquid reflux automatic valve 23 and the quaternary nitrification liquid reflux automatic valve 24 are all closed.

[0102] Only the sludge return pump 31 and the primary sludge return automatic valve 41 are opened to allow the sludge to return to the primary A / O reaction tank 100, while the secondary sludge return automatic valve 42, the tertiary sludge return automatic valve 43 and the quaternary sludge return automatic valve 44 are all closed.

[0103] In the aeration and stirring unit, the primary variable frequency blower 71 is turned off, and the primary jet pump 61, the secondary jet pump 62, the tertiary jet pump 63, the quaternary jet pump 64, the secondary variable frequency blower 72, the tertiary variable frequency blower 73 and the quaternary variable frequency blower 74 are turned on to aerate the primary A / O reaction tank 100 to the quaternary A / O reaction tank 400. When the A / O reaction tank is switched to the anaerobic mode, it is only necessary to turn on the jet pump and use the jet for stirring, without turning on the variable frequency blower to input oxygen.

[0104] (6) When the total COD amount and water volume are at the designed load state of 50% to 75%, the system is operated in A / O / O (anaerobic / aerobic) mode, the primary A / O reaction pool 100 stops operating, and the secondary A / O reaction pool 200 to the quaternary A / O reaction pool 400 are all operated:

[0105] Only the secondary upper water tunnel gate 92 and the tertiary upper water tunnel gate 93 are opened, only the secondary A / O reaction pool 200 is connected to the tertiary A / O reaction pool 400, and the primary upper water tunnel gate 91 is closed.

[0106] Only the secondary water inlet automatic control valve 112 is opened, while the primary water inlet automatic control valve 111, the tertiary water inlet automatic control valve 113 and the quaternary water inlet automatic control valve 114 are all closed.

[0107] Only the nitrification liquid reflux pump 11 and the secondary nitrification liquid reflux automatic valve 22 are opened to input the nitrification liquid into the secondary A / O reaction tank 200, and the primary nitrification liquid reflux automatic valve 21, the tertiary nitrification liquid reflux automatic valve 23 and the quaternary nitrification liquid reflux automatic valve 24 are all closed.

[0108] Only the sludge return pump 31 and the secondary sludge return automatic valve 42 are opened to allow the sludge to return to the secondary A / O reaction tank 200, while the primary sludge return automatic valve 41, the tertiary sludge return automatic valve 43 and the quaternary sludge return automatic valve 44 are all closed.

[0109] Only the secondary jet pump 62, the tertiary jet pump 63, the quaternary jet pump 64, the tertiary variable frequency blower 73 and the quaternary variable frequency blower 74 are turned on to aerate the secondary A / O reaction pool 200 to the quaternary A / O reaction pool 400, and the primary jet pump 61 and the primary variable frequency blower 71 are turned off to stop aerating the primary A / O reaction pool 100.

[0110] (7) When the total COD amount and the water volume are at the designed 0-50% load state, the system is operated in A / O (anaerobic / aerobic) mode, the primary A / O reaction pool 100 and the secondary A / O reaction pool 200 are stopped, and the tertiary A / O reaction pool 300 and the quaternary A / O reaction pool 400 are operated:

[0111] Only the third-level upper water tunnel gate 93 is opened, only the third-level A / O reaction pool 200 and the fourth-level A / O reaction pool 400 are connected, and the first-level upper water tunnel gate 91 and the second-level upper water tunnel gate 92 are closed.

[0112] Only the third-level water inlet automatic control valve 113 is opened, while the first-level water inlet automatic control valve 111, the second-level water inlet automatic control valve 112 and the fourth-level water inlet automatic control valve 114 are all closed.

[0113] Only the nitrification liquid reflux pump 11 and the tertiary nitrification liquid reflux automatic valve 23 are opened to input the nitrification liquid into the tertiary A / O reaction pool 300, and the primary nitrification liquid reflux automatic valve 21, the secondary nitrification liquid reflux automatic valve 22 and the quaternary nitrification liquid reflux automatic valve 24 are all closed.

[0114] Only the sludge return pump 31 and the tertiary sludge return automatic valve 43 are opened to allow the sludge to return to the tertiary A / O reaction tank 300, while the primary sludge return automatic valve 41, the secondary sludge return automatic valve 42 and the quaternary sludge return automatic valve 44 are all closed.

[0115] Only the tertiary jet pump 63, the quaternary jet pump 64 and the quaternary variable frequency blower 74 are turned on to aerate the tertiary A / O reaction pool 300 and the quaternary A / O reaction pool 400, and the primary jet pump 61, the secondary jet pump 62, the primary variable frequency blower 71 and the secondary variable frequency blower 72 are turned off to stop aerating the primary A / O reaction pool 100 and the secondary A / O reaction pool 200.

[0116] It should be noted that the above (1) to (7) are operating modes classified in a conventional way. There are other operating modes such as A / A / O / O (anaerobic / anoxic / aerobic), A / A / A / O (anaerobic / anoxic / anoxic / aerobic), etc. The specific start-up conditions are determined according to the actual water volume and water quality treated.

[0117] The ideal embodiment of the utility model is an inspiration. Through the above description, relevant staff can make various changes and modifications without departing from the scope of the technical idea of ​​the utility model.

[0118] The technical scope of this utility model is not limited to the contents in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A novel aerobic system, characterized in that: include: A / O reaction tanks arranged in series in multiple stages, sewage inlet pipes connected to the A / O reaction tanks, nitrification liquid reflux units, sludge reflux units, aeration and stirring units, and a control unit; An upper water hole is provided on the top of the side wall of the A / O reaction tank, and two adjacent A / O reaction tanks are connected through the upper water hole; The nitrification liquid reflux unit, the sludge reflux unit and the aeration stirring unit are used to provide the A / O reaction tank with nitrification liquid, sludge and oxygen respectively; The control unit is electrically connected to the nitrification liquid reflux unit, the sludge reflux unit, and the aeration and stirring unit respectively.

2. The novel aerobic system according to claim 1, characterized in that: The A / O reaction tank is provided with a nitrification liquid inlet; The nitrification liquid reflux unit comprises: a nitrification liquid reflux pipeline, a nitrification liquid reflux automatic control valve arranged on the nitrification liquid reflux pipeline, and a nitrification liquid reflux pump; The nitrification liquid reflux pipeline is connected to the nitrification liquid inlet; The nitrification liquid reflux automatic control valve and the nitrification liquid reflux pump are both electrically connected to the control unit.

3. The novel aerobic system according to claim 1, characterized in that: The A / O reaction tank is provided with a sludge inlet; The sludge return unit comprises a sludge return pipeline, a sludge return automatic control valve and a sludge return pump arranged on the sludge return pipeline; The sludge return pipeline is connected to the sludge inlet; The sludge return automatic control valve and the sludge return pump are both electrically connected to the control unit.

4. The novel aerobic system according to claim 1, characterized in that: The aeration and stirring unit comprises: a jet pipeline, an aeration pipeline and a jet aerator arranged in the A / O reaction tank; The jet pipeline and the aeration pipeline are both connected to the jet aerator.

5. The novel aerobic system according to claim 4, characterized in that: The jet pipeline is provided with a jet pump; The aeration pipeline is provided with a variable frequency blower; The jet pump and the variable frequency blower are both electrically connected to the control unit.

6. The novel aerobic system according to claim 1, characterized in that: A partition plate is provided in the A / O reaction pool, and the partition plate is used to divide the inner cavity of the A / O reaction pool into two reaction chambers; A lower water hole communicating with the two reaction chambers is provided at the bottom of the partition plate.

7. The novel aerobic system according to claim 1, characterized in that: The A / O reaction pool includes at least four stages.

8. The novel aerobic system according to claim 1, characterized in that: The A / O reaction tank is provided with a sewage inlet; The pipeline connecting the sewage inlet pipe and the sewage inlet is provided with an inlet automatic control valve; The water inlet automatic control valve is electrically connected to the control unit.

9. The novel aerobic system according to claim 1, characterized in that: An upper water passage gate is arranged at the upper water passage hole.

10. The novel aerobic system according to claim 1, characterized in that: A water outlet is provided at the top of the side wall of the A / O reaction tank of the last stage.

Images