CN216837542U - Bardenpho nitrogen and phosphorus removal system capable of operating in multiple modes - Google Patents

Abstract

The invention discloses a Bardenphos nitrogen and phosphorus removal system capable of operating in multiple modes, which comprises a water inlet channel, a sewage treatment unit and a secondary sedimentation tank which are sequentially connected, wherein the sewage treatment unit comprises an anoxic/anaerobic exchange area, a primary aerobic area, a secondary maneuvering area and a secondary aerobic area which are sequentially communicated, the anoxic/anaerobic exchange area is communicated with the water inlet channel, the anoxic/anaerobic exchange area at least comprises three lattice tanks, and a reflux selection area which is used for enabling nitrifying liquid of the primary aerobic area and the secondary aerobic area to flow back to the anoxic/anaerobic exchange area is arranged in the sewage treatment unit. The backflow selection area enables the multi-mode AAO operation mode and the Bardenpho operation mode to have the same backflow locus, the contradiction that the backflow loci of the two operation modes are different is solved, the system can be flexibly switched according to the inflow water quality, and the characteristics of standard stability of nitrogen and phosphorus, low operation cost, high impact load resistance and the like are achieved.

Description

Bardenpho nitrogen and phosphorus removal system capable of operating in multiple modes

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a Bardenphos nitrogen and phosphorus removal system capable of running in multiple modes.

Background

With the rapid development of society, the problem of water eutrophication becomes increasingly serious. The discharge standards of organic matters, nitrogen, phosphorus and other nutrient substances in the municipal sewage are gradually improved in various countries. At present, the sewage discharge standard of most cities in China is improved from the primary A standard of pollutant discharge standard of urban sewage treatment plants (GB18918-2002) to the class IV and V water standard of class ground surface in the quality standard of ground surface water environment (GB 3838-2002).

Among the related sewage treatment processes, the traditional anaerobic/anoxic/aerobic process (the traditional AAO process) and various deformation processes thereof are used as mainstream processes and are applied to the nitrogen and phosphorus removal treatment of urban sewage. The multi-mode AAO operation mode comprises a traditional AAO process and an improved AAO process. The traditional AAO process mainly comprises three sections of anaerobic, anoxic and aerobic; the multi-mode AAO operation mode can switch the traditional AAO process into the improved AAO process by changing the water inlet point and the backflow point.

The "Bardenpho" mode of operation includes five segments of the "Bardenpho" process and a modified "Bardenpho" process. The five-section 'Bardenpho' process is characterized in that an anoxic tank and an aerobic tank are connected in series after the traditional AAO process to form a multi-stage anoxic-aerobic alternative operation mode; the 'Bardenpho' operation mode can switch the five-segment 'Bardenpho' process into the operation of the improved 'Bardenpho' process by changing the water inlet and reflux points.

In the Bardenpho operation mode, the second anoxic pond can provide sufficient nutrition for the denitrifying bacteria through an external carbon source, so that the growth of the denitrifying bacteria is accelerated. Nitrogen which is not removed in the sewage can be further denitrified, the denitrification capability of the system is obviously improved, and the system can stably reach the standard when treating the sewage with higher total nitrogen content (TN content).

Because the nitrifying liquid in the multi-mode AAO operation mode flows back from the aerobic tail end, and the nitrifying liquid in the Bardenpho operation mode flows back from the tail end of the first aerobic tank, the nitrifying liquid return points of the multi-mode AAO operation mode and the Bardenpho operation mode in the same system are different, so that the sewage treatment of a sewage treatment plant is difficult to be compatible with the two sewage treatment operation modes in the same system.

In the actual operation process of the sewage treatment plant, the quality and quantity of inlet water of the sewage treatment plant may be affected by seasons, and obvious fluctuation occurs. Taking the Hainan area as an example, the Hainan area is more intensive in rainfall in summer, and the TN content of inlet water of a sewage plant is lower; in winter, the TN content of the inlet water is suddenly increased in 2-4 months in the sewage plant in the busy season of travel.

Although the nitrogen can be ensured to stably reach the standard by only adopting the Bardenpho running mode, when the TN content of the inlet water is lower, the problems of waste of the tank capacity and cost increase caused by additional carbon sources exist. Therefore, it is necessary to develop a sewage treatment system which can flexibly cope with water quality changes and has strong impact load resistance.

Disclosure of Invention

In order to solve the problem that the multi-mode AAO operation mode and the Bardenpho operation mode cannot be compatible in the same system, the sewage treatment system can flexibly deal with the change of water quality and improve the impact load resistance, the application provides the Bardenpho nitrogen and phosphorus removal system capable of operating in multiple modes.

The application provides a Bardenphos nitrogen and phosphorus removal system capable of running in multiple modes, which adopts the following technical scheme:

the utility model provides a but Bardenpho nitrogen and phosphorus removal system of multi-mode operation, includes consecutive inlet channel, sewage treatment unit and two heavy ponds, the sewage treatment unit is including the lack/anaerobism exchange area that is linked together in proper order, one-level aerobic area, the maneuvering zone of second grade and the aerobic area of second grade, lack/anaerobism exchange area and inlet channel intercommunication, lack/anaerobism exchange and contain three check pond in the district at least, be equipped with in the sewage treatment unit and be used for making the equal backward flow of liquid that nitrifies in one-level aerobic area and the aerobic area of second grade to the backward flow option district that lacks/anaerobism exchange the district.

The number and the position of the anaerobic zone and the anoxic zone can be sequentially arranged and adjusted in the anoxic/anaerobic exchange zone according to the requirement of an operation mode, and the anoxic/anaerobic exchange zone, the primary aerobic zone, the secondary maneuvering zone and the secondary aerobic zone are matched, so that the system can meet the basic operation requirements of a multi-mode AAO operation mode and a Bardenpho operation mode;

by adopting the technical scheme, the nitrifying liquid in the two types of operation modes can firstly flow back to the backflow selection area and then enter the grid pond of the corresponding lack/anaerobic exchange area, so that the backflow of the nitrifying liquid in the sewage treatment unit is realized; this application selects the district as with the backward flow site with the backward flow, integrates two types of operation mode in same system, can be according to quality of water volume change and sewage discharge's requirement, and nimble adjustment operation mode when practicing thrift the running cost guarantees that nitrogen phosphorus is stable up to standard, possesses stronger anti impact load capacity, is favorable to sewage treatment plant's operation.

Optionally, the backward flow option area includes backward flow corridor, backward flow option point and interior backward flow point, between one-level aerobic zone and the backward flow corridor and all communicate through backward flow option point between second grade aerobic zone and the backward flow corridor, through interior backward flow point intercommunication between backward flow corridor and the scarce/anaerobism exchange district.

Through adopting above-mentioned technical scheme, the backward flow corridor communicates one-level aerobic zone and second grade aerobic zone, and the backward flow corridor cooperates with the backward flow select point, and the liquid of nitrifying in the control one-level aerobic zone flows back or the liquid of nitrifying in the second grade aerobic zone flows back, simultaneously, through opening and close of the backward flow point in the control, according to the mode that the system was operated, selects corresponding check pond to pour into the liquid of nitrifying, accomplishes the liquid of nitrifying and flows back.

Optionally, the backflow selection area further comprises a nitrifying liquid conveying channel for injecting nitrifying liquid into the lack/anaerobic exchange area, and the nitrifying liquid conveying channel is communicated with the backflow gallery through a pumping assembly.

By adopting the technical scheme, the pumping assembly fully pumps the nitrified liquid into the nitrified liquid conveying channel, and the water level in the nitrified liquid conveying channel is kept in a high-water-level state, so that the nitrified liquid is automatically injected into the lack/anaerobic exchange area.

Optionally, be equipped with division wall and impeller in the good oxygen district of one-level, division wall is located good oxygen district center department of one-level, the clearance is left with the pool wall in good oxygen district of one-level at division wall both ends, forms circulation corridor, the impeller is located circulation corridor.

Through adopting above-mentioned technical scheme, the impeller promotes sewage and flows in the circulation corridor in one-level aerobic zone for the sewage intensive mixing in the one-level aerobic zone eliminates the dissolved oxygen concentration gradient in one-level aerobic zone, is favorable to the dissolved oxygen concentration in operator control one-level aerobic zone, and when the system was moved with Bardenpho running mode, the system operation was more stable.

Optionally, aeration devices are arranged outside the primary aerobic zone, the secondary aerobic zone and the secondary maneuvering zone.

Through adopting above-mentioned technical scheme, aeration equipment is used for carrying outside air to first order aerobic zone, second grade aerobic zone and second grade in the mobile district, and aeration equipment opens, then can supply dissolved oxygen in each district for the dissolved oxygen concentration in each district maintains stably.

Optionally, the aeration device includes an air inlet pipe and aerators, an air outlet end of the air inlet pipe is communicated with an air inlet end of the aerator, and each aerator is located at the bottom of the corresponding first-stage aerobic zone, second-stage aerobic zone and second-stage maneuvering zone.

Through adopting above-mentioned technical scheme, the venthole that the outside air passes through on the aerator overflows, carries out the disturbance to sewage, and its oxygen that contains dissolves in sewage, and sewage and air fully contact simultaneously increase the dissolved oxygen concentration in the sewage, and in addition, the sewage disturbance is difficult for producing the sediment in each district to improve sewage treatment efficiency.

Optionally, an air flow regulating valve is arranged on the air inlet pipe.

By adopting the technical scheme, the opening degree of the air flow regulating valve can be regulated, so that an operator can regulate the concentration of dissolved oxygen according to the water quality of inlet water and outlet water of a sewage treatment plant and the change trend of the dissolved oxygen.

Optionally, a gas flowmeter is arranged on the gas inlet pipe.

Through adopting above-mentioned technical scheme, gas flowmeter can with air flow control valve electric connection, can reflect the income volume of air in real time, and according to the change trend of dissolved oxygen concentration in each district, carry out automatic accurate adjustment to the income volume of air, be favorable to the dissolved oxygen concentration in each district to maintain in certain within range, improve sewage treatment system's nitrogen and phosphorus removal effect.

Optionally, a stirring device is arranged in each cell of the lack/anaerobic exchange area.

Through adopting above-mentioned technical scheme, agitating unit includes but not limited to electric agitator, and agitating unit carries out the disturbance to sewage, guarantees to lack/each check pond in anaerobism change district and does not produce the sediment, improves sewage nitrogen and phosphorus removal efficiency.

Optionally, the sewage treatment unit is equipped with two, two the sewage treatment unit is the axisymmetric distribution about the center department of inlet channel width direction, two the sewage treatment unit all communicates with the inlet channel.

Through adopting above-mentioned technical scheme, two sewage treatment unit sharing intake channel, on the one hand when the sewage water yield increases, two sewage treatment unit can the concurrent operation, improve nitrogen and phosphorus removal system's load capacity, and on the other hand reduces the area of system, reduces construction cost.

In summary, the present application has the following beneficial effects:

1. according to the multi-mode AAO operation mode and the Bardenpho operation mode, the same backflow point position is formed through the backflow selection area, the sewage treatment unit can perform nitrification liquid backflow from the primary aerobic area or the secondary aerobic area according to different operation modes, the multi-mode AAO operation mode and the Bardenpho operation mode are switched, the contradiction that the backflow selection point positions in the two processes are different is overcome, and good operation conditions are provided for engineering.

2. Through the cooperation use of division wall and impeller in this application, the sewage inflow backward flow selection district in the one-level aerobic zone of being convenient for on the one hand, on the other hand makes the one-level aerobic zone form the circulation corridor for sewage keeps unanimous at the dissolved oxygen concentration in one-level aerobic zone each department, so that the operator controls the dissolved oxygen concentration in the one-level aerobic zone, is favorable to the steady operation of nitrogen and phosphorus removal system.

3. Through the cooperation between gas flowmeter and the air flow governing valve for the dissolved oxygen concentration in the good oxygen district can carry out automatically regulated according to sewage treatment plant water quality of business turn over, the change trend of water quality and dissolved oxygen.

Drawings

FIG. 1 is a schematic overall plan view of an embodiment for embodying the present application;

FIG. 2 is a schematic perspective view of a primary aerobic zone used in embodiments of the present application;

fig. 3 is a schematic flow chart for embodying the principles of an embodiment of the present application.

Reference numerals:

1. a water inlet channel; 11. a point of inflow of sewage; 111. a first sewage inflow point; 112. a second point of sewage inflow; 12. a sewage inflow pipe; 2. a sewage treatment unit; 20. an anoxic/anaerobic exchange zone; 21. a first cell; 22. a second cell; 23. a third cell; 24. a primary maneuvering zone; 25. a primary aerobic zone; 251. a dividing wall; 252. a flow impeller; 26. a secondary maneuvering zone; 27. a secondary aerobic zone; 28. A reflux selection zone; 280. an inner return channel; 281. a return gallery; 282. a reflux selection point; 2821. a first reflux selection point; 2822. a second reflux selection point; 283. an internal reflux point; 2831. a first internal reflux point; 2832. a second internal reflux point; 2833. a third internal reflux point; 284. a nitrifying liquid conveying channel; 285. a pumping assembly; 3. a secondary sedimentation tank; 4. a water outlet channel; 5. a sludge return channel; 6. a sludge pump house; 7. the sludge flows into the channel; 71. a sludge inflow point; 8. an aeration device; 81. a blower; 82. an air inlet pipe; 821. an aerator; 83. an air flow regulating valve; 84. a gas flow meter; 9. and (4) a stirring device.

Detailed Description

The present application is described in further detail below with reference to examples and figures 1-3.

Examples

Referring to fig. 1, the Bardenpho denitrification and dephosphorization system capable of operating in multiple modes comprises a water inlet channel 1, a sewage treatment unit 2 and a secondary sedimentation tank 3 which are communicated in sequence. Sewage flows into the water inlet channel 1, and according to the quality of water of intaking (TN content of intaking promptly) and the requirement of discharging, sewage treatment unit 2 selects corresponding operation mode, carries out dephosphorization denitrogenation and handles, and sewage through dephosphorization denitrogenation handles gets into two heavy ponds 3 and deposits, realizes mud-water separation, and the sewage that reaches the requirement of discharging is discharged from two heavy ponds 3, and activated sludge flows into sewage treatment unit 2 again and carries out reuse.

Referring to fig. 1, the water inlet end of the water inlet channel 1 is provided with a sewage inflow pipe 12, external sewage enters the water inlet channel 1 through the sewage inflow pipe 12, and an operator detects the TN content of the sewage in the water inlet channel 1.

Referring to fig. 1, two sewage treatment units 2 are provided, the two sewage treatment units 2 have the same structure, and the two sewage treatment units 2 are located at two sides of the length direction of the water inlet channel 1 and are symmetrically distributed about the water inlet channel 1. The two sewage treatment units 2 share one water inlet channel 1, so that the instantaneous sewage treatment efficiency of the Bardenpho nitrogen and phosphorus removal system capable of operating in multiple modes is increased, the load capacity of the Bardenpho nitrogen and phosphorus removal system capable of operating in multiple modes is improved, meanwhile, the occupied area of the system is reduced, and the construction cost is saved.

Referring to fig. 1, the sewage treatment unit 2 includes a lack/anaerobic exchange zone 20, a primary aerobic zone 25, a secondary mobile zone 26, and a secondary aerobic zone 27, which are sequentially communicated. A plurality of partition walls are arranged inside the lack/anaerobic exchange area 20, and the plurality of partition walls are all arranged along the length direction of the lack/anaerobic exchange area 20. A plurality of grid cells are divided in the lack/anaerobic exchange area 20, the structure of each grid cell is the same, and two adjacent grid cells are communicated through water passing holes.

Referring to fig. 1, the grid pond is communicated with the water inlet channel 1 through a sewage inflow point 11, and the sewage inflow point 11 can be selected to adjust the weir gate so as to regulate and control the inflow of sewage. The grid pond is first grid pond 21, second grid pond 22, third grid pond 23 along sewage flow direction in proper order, and sewage inflow point 11 sets up two, and the sewage inflow point 11 that is located first grid pond 21 top is first sewage inflow point 111, and the sewage inflow point 11 that is located second grid pond 22 top is second sewage inflow point 112.

Referring to fig. 1, each cell acts as an anaerobic or anoxic zone. The dissolved oxygen concentration of the anaerobic zone is lower than 0.2mg/L, the anaerobic zone forms the nutritional condition and the environmental condition required by the phosphorus-accumulating bacteria, and the phosphorus-accumulating bacteria absorb low-molecular volatile organic acid in the sewage and convey the low-molecular volatile organic acid into cells to be assimilated into intracellular carbon energy storage substances; meanwhile, the phosphorus accumulating bacteria can release part of phosphorus, so that phosphorus can be absorbed by the phosphorus accumulating bacteria in a subsequent aerobic zone. The dissolved oxygen concentration of the anoxic zone is 0.2 mg/L-0.5 mg/L, nitrifying liquid is injected into the anoxic zone, and after the nitrifying liquid is mixed with sewage, the contained nitrate nitrogen is generated under the action of denitrifying bacteria to release nitrogen, so that the denitrification effect is achieved.

Referring to fig. 1, in order to meet the operation requirements of four operation modes (a conventional AAO operation mode, an improved AAO operation mode, a five-segment Bardenpho operation mode, and an improved Bardenpho operation mode), three cells in the anoxic/anaerobic exchange zone 20 may be arranged according to an anaerobic zone (a first cell), an anoxic zone (a second cell), and an anoxic zone (a third cell), so that when the system operates according to the conventional AAO operation mode or the five-segment Bardenpho operation mode, denitrification can be completed in the anoxic/anaerobic exchange zone 20; or the three cells in the anoxic/anaerobic exchange area 20 are arranged according to the pre-anoxic area (first cell), the anaerobic area (second cell) and the anoxic area (third cell), so that when the system operates according to the improved AAO operation mode or the improved Bardenpho operation mode, denitrification treatment can be completed in the anoxic/anaerobic exchange area 20, activated sludge in the anoxic/anaerobic exchange area 20 can fully carry out anaerobic phosphorus release, and the phosphorus absorption capacity of the subsequent aerobic area is improved.

Referring to fig. 1, lack/equal fixed mounting has agitating unit 9 in each check pond of anaerobism change district 20, and agitating unit 9 selects electric mixer in this application, and agitating unit 9 carries out the disturbance to sewage, does not produce the sediment in guaranteeing anaerobic zone and each anoxic zone for sewage and activated sludge fully contact, carry out nitrogen and phosphorus removal and handle, thereby promote the treatment effeciency of sewage.

Referring to fig. 1, the electric stirrer is obliquely arranged, and the electric stirrer and the water passing holes for sewage to flow out of the grid are respectively distributed at two corners of the grid in the same width direction, so that the interference of vortex generated by the rotation of the electric stirrer on the flow of sewage is weakened.

Referring to fig. 1, the third cell 23 is adjacent to the primary aerobic zone 25, and a primary mobile zone 24 may be added between the third cell 23 and the primary aerobic zone 25. The third cell 23, the primary maneuvering zone 24 and the primary aerobic zone 25 are communicated in sequence through the water passing holes.

Referring to fig. 1, both the primary mobile zone 24 and the secondary mobile zone 26 (collectively referred to as mobile zones) can be switched between anoxic and aerobic environments. Reducing the dissolved oxygen concentration of the mobile zone, wherein the mobile zone can be used as an anoxic zone; similarly, the concentration of dissolved oxygen in the maneuvering zone is increased, and the maneuvering zone can serve as an aerobic zone. The volume of the anoxic zone and the aerobic zone can be adjusted according to the water quality by additionally arranging the primary maneuvering zone 24, so that the sewage treatment efficiency is improved.

Referring to fig. 1, aeration devices 8 are disposed on the primary mobile zone 24, the primary aerobic zone 25, the secondary mobile zone 26, and the secondary aerobic zone 27. Referring to fig. 2, the aeration apparatus 8 includes a blower 81, an intake pipe 82, an aerator 821, an air flow rate adjusting valve 83, and a gas flow meter 84. The aeration apparatus 8 of the primary aerobic zone 25 will be described as an example. The blower 81 is located outside the first-stage aerobic zone 25 and is used for compressing outside air, the air inlet end of the air inlet pipe 82 is communicated with the air outlet end of the blower 81, and the air outlet end of the air inlet pipe 82 is communicated with the air inlet end of the aerator 821.

Referring to fig. 2, the aerator 821 is located at the bottom of the primary aerobic zone 25, and the outside air escapes upwards from the bottom of the primary aerobic zone 25 to disturb the sewage in the primary aerobic zone 25, so that the sewage is fully contacted with the air, and the dissolved oxygen concentration of the sewage is increased. Meanwhile, due to sewage disturbance, precipitation is not easy to generate in the primary aerobic zone 25, and the phosphorus absorption efficiency of the activated sludge is not easy to influence.

Referring to fig. 2, the air flow regulating valve 83 and the gas flow meter 84 are both fixedly installed on the air inlet pipe 82, and the gas flow meter 84 can detect the flow of the gas in the air inlet pipe 82 in real time, so that an operator can accurately regulate the concentration of the dissolved oxygen in the primary aerobic zone 25 according to the variation trend of the quality of inlet and outlet water and the dissolved oxygen. During actual use of the air flow regulating valve 83 and the gas flowmeter 84, the air flow regulating valve 83 and the gas flowmeter 84 can be electrically connected, so that the opening degree of the air flow regulating valve 83 can be automatically adjusted.

Referring to fig. 1, the primary aerobic zone 25 and the secondary aerobic zone 27 are collectively called as an aerobic zone, the dissolved oxygen concentration in the aerobic zone is greater than 2mg/L, and phosphorus accumulating bacteria in the aerobic zone absorb phosphorus in the sewage to reduce the phosphorus content in the sewage.

Referring to fig. 2, a partition wall 251 is stacked at the center of the primary aerobic zone 25, the partition wall 251 is disposed along the length direction of the primary aerobic zone 25, and the partition wall 251 plays a role in guiding flow. Gaps of 3-4m are reserved between the two ends of the partition plate and the inner wall of the first-stage aerobic zone 25, so that the partition wall 251 and the first-stage aerobic zone 25 form a circulating gallery, and sewage in the first-stage aerobic zone 25 can flow in a circulating manner in the circulating gallery to be mixed.

Referring to fig. 2, in order to improve the mixing uniformity of the sewage, two flow pushers 252 may be installed between the dividing wall 251 and the first-stage aerobic zone 25, and the number of the flow pushers 252 may be adjusted according to actual requirements. The flow driver 252 accelerates the flow of the sewage in the circulating circular flow corridor, and is beneficial to an operator to control the dissolved oxygen concentration of the aerobic zone so as to facilitate the stable operation of the nitrogen and phosphorus removal system.

Referring to fig. 1, a reflux selection zone 28 is provided between the primary aerobic zone 25 and the secondary aerobic zone 27, and nitrified liquid in both the primary aerobic zone 25 and the secondary aerobic zone 27 can be refluxed into the reflux selection zone 28. The return flow selection zone 28 includes an inner return channel 280, a return gallery 281 and a nitrification liquor transport channel 284 connected in series.

Referring to fig. 1, the water inlet end of the inner return channel 280 is in communication with the water outlet end of the primary aerobic zone 25 via a water through hole, the water outlet end of the inner return channel 280 is in communication with the water inlet end of the secondary motive zone 26 via a water through hole, and the inner return channel 280 is in communication with the return gallery 281 via a first return selection point 2821. The sewage after the phosphorus absorption treatment in the primary aerobic zone 25 can be divided in the inner return channel 280. When the first return selection point 2821 is open, a portion of the wastewater enters the secondary motive region 26 and another portion enters the return gallery 281 for return as nitrified liquid.

Referring to fig. 1, the return gallery 281 communicates with the secondary aerobic zone 27 through a second return selection point 2822. The first return selection point 2821 and the second return selection point 2822 (collectively referred to as the return selection points 282) are sluice gates. When the nitrification liquid in the secondary aerobic zone 27 is required to be refluxed, the second reflux selection point 2822 is opened, and the nitrification liquid in the secondary aerobic zone 27 flows into the reflux corridor 281. The return gallery 281 and the return selection point 282 are used in cooperation, so that the nitrified liquid in the primary aerobic zone 25 or the secondary aerobic zone 27 flows back to the return gallery to form the same nitrified liquid return point.

Referring to fig. 1, three internal reflux points 283 are arranged on the side of the nitrified liquid conveying channel 284. The nitrified liquid is injected into the corresponding anoxic/anaerobic exchange zone 20 through the internal reflux point 283. Wherein, the first cell 21 is communicated with a first internal reflux point 2831, the second cell 22 is communicated with a second internal reflux point 2832, and the third cell 23 is communicated with a third internal reflux point 2833.

Referring to fig. 1, a pumping assembly 285 is fixedly installed between the return gallery 281 and the nitrification liquid selection channel 284, and the pumping assembly 285 can be a through-the-wall pump. The water pumping end of the wall-through pump extends into the backflow gallery 281, the water outlet end is positioned in the nitrified liquid conveying channel 284, and the wall-through pump pumps the nitrified liquid into the nitrified liquid conveying channel 284, so that the nitrified liquid in the nitrified liquid conveying channel 284 is always maintained in a high water level state, and the nitrified liquid can smoothly flow into the corresponding 20-cell pool of the lack/anaerobic exchange area. The number of pumping assemblies 285 may be adjusted according to the actual operating efficiency.

Referring to fig. 1, a water outlet channel 4 is arranged between the secondary aerobic zone 27 and the secondary sedimentation tank 3, and the water outlet channel 4 is communicated with the two secondary aerobic zones 27. The secondary aerobic zone 27, the water outlet channel 4 and the secondary sedimentation tank 3 are communicated through the water passing holes in sequence, sewage in the secondary aerobic zone 27 is collected in the water outlet channel 4 and enters the secondary sedimentation tank 3 through the water passing holes to be kept stand and precipitated, activated sludge is separated from water, the activated sludge stores phosphorus in the sewage, the phosphorus content in the sewage is obviously reduced, and the sewage dephosphorization treatment is realized. And the sewage after dephosphorization treatment can be directly discharged from the secondary sedimentation tank 3.

Referring to fig. 1, a sludge return channel 5 is arranged below the water outlet channel 4, and the sludge return channel 5 and the water outlet channel 4 form a double-layer structure, so that the floor area of the system is saved. The sludge return channel is communicated with the bottom of the secondary sedimentation tank through a sludge return pipe, and the activated sludge at the bottom of the secondary sedimentation tank 3 enters the sludge return channel 5 through the sludge return pipe. One side of the sludge return channel 5, which is far away from the secondary sedimentation tank 3, is sequentially provided with a sludge pump room 6 and a sludge inflow channel 7. Activated sludge is shunted in the sludge pump room 6, a part of activated sludge is recycled through a residual sludge pump discharge system in the sludge pump room 6, and the other part of activated sludge is pumped into a sludge inflow canal 7 through a sludge return pump in the sludge pump room 6.

Referring to fig. 1, a sludge inflow channel 7 connects a sludge pump room 6 and a first grid 21, a sludge inflow point 71 is arranged in the sludge inflow channel 7, the sludge inflow point 71 can be an adjustable weir gate, the sludge inflow point 71 is opened, and activated sludge flows back into the first grid 21.

Referring to fig. 1 and 3, the specific implementation process of the present application is as follows:

arranging an online inlet water monitoring system at a factory inlet water lift pump room, detecting the TN content of inlet water through an online total nitrogen monitor, opening a valve of a sewage inflow pipe 12, and injecting sewage into an inlet channel 1;

when the TN content of the sewage of the water inlet channel is less than 40mg/L, the sewage treatment unit operates in a multi-mode AAO operation mode, and then a traditional AAO operation mode or an improved AAO operation mode is selected according to the requirement of sewage dephosphorization;

when the requirement on the denitrification and dephosphorization of the sewage is not high, the sewage treatment unit selects the traditional AAO operation mode: the first cell 21 is used as an anaerobic zone, the second cell 22, the third cell 23 and the first-level maneuvering zone 24 are used as anoxic zones, and the first-level aerobic zone 25, the second-level maneuvering zone 26 and the second-level aerobic zone 27 are used as aerobic zones; opening the second return selection point 2822 and closing the first return selection point 2821 so that the nitrified liquid enters the return gallery 281 from the end of the secondary aerobic zone 27; the second internal return point 2832 is opened, the nitrified liquid flows back into the second cell 22, and simultaneously the activated sludge flows back into the first cell 21.

When the requirement on the phosphorus removal of the sewage is higher, the sewage treatment unit selects an improved AAO operation mode: the first cell 21 is used as a pre-anoxic zone, the second cell 22 is used as an anaerobic zone, the third cell 23 and the first-level maneuvering zone 24 are used as first-level anoxic zones, and the second-level maneuvering zone 26 is used as an aerobic zone; opening the second return selection point 2822 and closing the first return selection point 2821 so that the nitrified liquid enters the return gallery 281 from the end of the secondary aerobic zone 27; opening a third internal reflux point 2833, and refluxing the nitrified liquid into the third lattice pool 23; while the activated sludge flows back to the first cell 21.

When the TN content of the sewage in the water inlet channel is more than or equal to 40mg/L, the sewage treatment unit operates in a Bardenpho operation mode, and then five sections of Bardenpho operation modes or an improved Bardenpho operation mode are selected according to the requirement of sewage dephosphorization.

When the requirement on the phosphorus removal of the sewage is not high, the sewage treatment unit selects a five-section Bardenpho operation mode: the first cell 21 is used as an anaerobic zone, the second cell 22, the third cell 23 and the primary maneuvering zone 24 are used as anoxic zones, and the secondary maneuvering zone 26 is used as an anoxic zone; opening the first return selection point 2821 and closing the second return selection point 2822 such that the nitrified liquid enters the inner return channel 280 from the end of the primary aerobic zone 25 and then enters the return gallery 281; the second internal return point 2832 is opened, the nitrified liquid flows back into the second cell 22, and simultaneously the activated sludge flows back into the first cell 21.

When the requirement on the phosphorus removal of the sewage is higher, the sewage treatment unit selects an improved Bardenphos operation mode to operate: the first cell 21 is used as a pre-anoxic zone, the second cell 22 is used as an anaerobic zone, the third cell 23 and the first-level maneuvering zone 24 are used as first-level anoxic zones, and the second-level maneuvering zone 26 is used as a second-level anoxic zone; opening the first return flow selection point 2821 and closing the second return flow selection point 2822, and allowing the nitrified liquid to enter the inner return channel 280 from the tail end of the primary aerobic zone 25 and then enter the return gallery 281; opening a third internal reflux point 2833, and refluxing the nitrified liquid into the third lattice pool 23; while the activated sludge flows back to the first cell 21.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (10)

1. The utility model provides a but Bardenpho nitrogen and phosphorus removal system of multimode operation, includes inlet channel (1), sewage treatment unit (2) and two heavy ponds (3) that link to each other in proper order, its characterized in that: sewage treatment unit (2) are including scarce/anaerobism exchange area (20), one-level aerobic district (25), second grade maneuvering area (26) and second grade aerobic district (27) that communicate with each other in proper order, lack/anaerobism exchange area (20) and intake canal (1) intercommunication, lack/anaerobism exchange area (20) interior three check pond that contain at least, be equipped with in sewage treatment unit (2) and be used for making the equal backward flow of nitrifying liquid in one-level aerobic district (25) and second grade aerobic district (27) select district (28) to the backward flow that lacks/anaerobism exchange area (20).

2. The system of claim 1, wherein the system is characterized in that: the backflow selection area (28) comprises a backflow gallery (281), a backflow selection point (282) and an internal backflow point (283), the primary aerobic area (25) and the backflow gallery (281) and the secondary aerobic area (27) and the backflow gallery (281) are communicated through the backflow selection point (282), and the backflow gallery (281) and the lack/anaerobic exchange area (20) are communicated through the internal backflow point (283).

3. The system of claim 2, wherein the system is characterized in that: the backflow selection area (28) further comprises a nitrification liquid conveying channel (284) used for injecting nitrification liquid into the anoxic/anaerobic exchange area (20), and the nitrification liquid conveying channel (284) is communicated with the backflow gallery (281) through a pumping assembly (285).

4. The system of claim 1, wherein the system is characterized in that: a partition wall (251) and a flow impeller (252) are arranged in the primary aerobic zone (25), the partition wall (251) is located at the center of the primary aerobic zone (25), gaps are reserved between the two ends of the partition wall (251) and the pool wall of the primary aerobic zone (25) to form a circulation corridor, and the flow impeller (252) is located in the circulation corridor.

5. The system of claim 1, wherein the system is characterized in that: aeration devices (8) are arranged outside the primary aerobic zone (25), the secondary aerobic zone (27) and the secondary maneuvering zone (26).

6. The Bardenpho denitrification and dephosphorization system capable of multi-mode operation according to claim 5, wherein: the aeration device (8) comprises an air inlet pipe (82) and aerators (821), the air outlet end of the air inlet pipe (82) is communicated with the air inlet end of the aerators (821), and each aerator (821) is located at the bottom of the corresponding primary aerobic zone (25), the corresponding secondary aerobic zone (27) and the corresponding secondary maneuvering zone (26).

7. The Bardenpho denitrification and dephosphorization system capable of multi-mode operation according to claim 6, wherein: and an air flow regulating valve (83) is arranged on the air inlet pipe (82).

8. The Bardenpho denitrification and dephosphorization system capable of multi-mode operation according to claim 6, wherein: and a gas flowmeter (84) is arranged on the gas inlet pipe (82).

9. The system of claim 1, wherein the system is characterized in that: and stirring devices (9) are arranged in the lack/anaerobic exchange area (20).

10. The system of claim 1, wherein the system is characterized in that: the sewage treatment units (2) are arranged in two, and the sewage treatment units (2) are distributed in an axisymmetric mode in the center of the width direction of the water inlet channel (1), and the sewage treatment units (2) are communicated with the water inlet channel (1).

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