CN217555895U - Low-energy-consumption integrated biological sewage treatment system - Google Patents
Low-energy-consumption integrated biological sewage treatment system Download PDFInfo
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- CN217555895U CN217555895U CN202220846616.0U CN202220846616U CN217555895U CN 217555895 U CN217555895 U CN 217555895U CN 202220846616 U CN202220846616 U CN 202220846616U CN 217555895 U CN217555895 U CN 217555895U
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Abstract
The utility model discloses a low energy consumption integrated form sewage biological treatment system, the system includes: the middle part in the integrated circular main tank body is a circular secondary sedimentation tank, and a circular anaerobic tank, an anoxic tank and an aerobic tank are sequentially sleeved outside the circular secondary sedimentation tank; at least two flow impellers are uniformly distributed in the annular anaerobic tank, the anoxic tank and the aerobic tank; a plurality of aerators are uniformly distributed in the annular aerobic tank; the circular anaerobic tank is provided with a water inlet pipeline, and the side wall of the bottom of the circular anaerobic tank is provided with a first water passing hole communicated with the circular anoxic tank; a second water passing hole communicated with the circular aerobic tank is formed in the side wall of the bottom of the circular anoxic tank; an inner return channel is arranged on the shared wall of the circular aerobic tank and the circular anoxic tank; the water outlet end of the circular aerobic tank is communicated with the circular secondary sedimentation tank through a secondary sedimentation tank water inlet pipeline; the round secondary sedimentation tank is internally connected with a secondary sedimentation tank water outlet pipeline and a residual sludge discharge pipe respectively. The system has high integration level and low energy consumption, and can achieve better biochemical treatment effect.
Description
Technical Field
The utility model relates to a sewage treatment field especially relates to an integrated form biological sewage treatment system.
Background
The biological treatment system is the most core unit of a town sewage treatment plant, and the metabolism of microorganisms decomposes complex organic matters in sewage into simple substances and simultaneously performs nitrogen and phosphorus removal to purify the sewage. The aeration system is an important link of biological treatment. The conventional biological treatment systems generally include a plug flow type AAO system and an oxidation ditch system.
The structure of a plug-flow reaction tank of an existing plug-flow AAO system is generally shown in figure 1 and comprises an anaerobic zone 100, an anoxic zone 200 and an aerobic zone 300, wherein the aerobic zone of an aeration zone is a plug-flow type, a plug-flow tank is generally a strip-shaped tank, a long tank is generally multi-fold, water enters from one end of the tank and is pushed out from the other end after a certain time and flow. In the plug flow type AAO system, the aeration system not only provides dissolved oxygen for water, maintains the requirements of the life activities of microorganisms, removes reductive pollutants such as COD (chemical oxygen demand), ammonia nitrogen and the like, but also generates enough stirring and mixing effects, so that the activated sludge is fully contacted and mixed with the wastewater. Because oxygenation and stirring are mutually influenced, the aeration quantity is difficult to accurately adjust, and if the aeration quantity is too large, the energy consumption is high, and the removal effect of total nitrogen and total phosphorus is influenced; if the aeration rate is too low, the effect of stirring and mixing cannot be obtained, and it is difficult to find a balance point between oxygen supply and stirring. In addition, the ammonia nitrogen and organic matter concentration of the plug flow type reaction tank is constantly changed along the process, the requirement for aeration quantity is constantly changed, the adjustment is difficult, the over aeration phenomenon is easy to occur, the aeration energy consumption is higher, meanwhile, the total nitrogen and total phosphorus removal effect is poor, and the adding quantity of chemical agents such as carbon sources and phosphorus removal agents is increased; after overexposure occurs, the problems of loose sludge, small flocs and the like can also be caused; anaerobic, anoxic and aerobic rectangular tanks have poor hydraulic conditions and high energy consumption for stirring and plug flow; the adaptability to water quality and water quantity changes is poor, and the impact resistance is poor; the integration level is low, the biochemical tank and the secondary sedimentation tank are completely separated, the occupied area is large, the pipeline is long, and the pipeline system is complex.
The common AAO oxidation ditch pool type structure of the existing oxidation ditch system is generally shown in fig. 2 and comprises an anaerobic zone 100, an anoxic zone 200 and an aerobic zone 300, wherein the aerobic zone is in a circulating channel type, and a flow impeller is adopted to form a circulating flow in the pool, so that the separation of aeration and stirring can be realized, but the flow impeller power density is relatively high. In addition, because the rectangular pool is anaerobic, anoxic and aerobic, the hydraulic condition is not good enough, the energy consumption of stirring and plug flow is high, and the power density of the stirring and plug flow is generally 5w/m 3 And the above; and the integration level is low, the biochemical tank and the secondary sedimentation tank are completely separated, the occupied area is large, the pipeline is long, and the pipeline system is complex.
Therefore, how to provide a biological sewage treatment system with high integration and low energy consumption effectively solves the problem that the defects of the two conventional biochemical tanks need to be solved.
In view of this, the present invention is especially provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a low energy consumption integrated form biological sewage treatment system, the integrated level is high and the energy consumption is low, and the treatment effect is good, and then solves the above-mentioned technical problem that exists among the prior art.
The utility model aims at realizing through the following technical scheme:
the utility model discloses embodiment provides a low energy consumption integrated form sewage biological treatment system, include:
the integrated circular main tank body is internally provided with a circular secondary sedimentation tank at the middle part, and a circular anaerobic tank, a circular anoxic tank and a circular aerobic tank are sequentially sleeved outside the circular secondary sedimentation tank from inside to outside;
at least two flow impellers are uniformly distributed in the annular anaerobic tank, the annular anoxic tank and the annular aerobic tank;
a plurality of aerators are uniformly distributed in the circular aerobic tank;
the circular anaerobic tank is provided with a water inlet pipeline, and the side wall of the bottom of the circular anaerobic tank is provided with a first water passing hole communicated with the circular anoxic tank;
a second water passing hole communicated with the circular aerobic tank is formed in the side wall of the bottom of the circular anoxic tank;
an inner reflux channel is arranged on the shared wall of the circular aerobic tank and the circular anoxic tank;
the water outlet end of the annular aerobic tank is communicated with the circular secondary sedimentation tank through a secondary sedimentation tank water inlet pipeline;
the circular secondary sedimentation tank is internally connected with a secondary sedimentation tank water outlet pipeline and a residual sludge discharge pipe respectively;
and the water inlet end of the circular anaerobic tank is connected with the residual sludge discharge pipe of the circular secondary sedimentation tank through an outer return pipeline provided with a sludge return pump.
Compared with the prior art, the utility model provides a low energy consumption integrated form sewage biological treatment system, its beneficial effect includes:
by adopting the integrated circular total pool body, the circular biochemical pool and the circular secondary sedimentation pool are combined and integrated together, the arrangement is compact, and through arranging the impeller, complete mixed circulating flows are formed in the circular anaerobic pool, the anoxic pool and the aerobic pool, aeration, oxygenation and stirring and mixing can be completely separated without mutual influence, aeration according to needs is realized, aeration is uniform, meanwhile, the hydraulic condition is good, each of the anaerobic pool, the anoxic pool and the aerobic pool is circular, the stirring and impeller power in the pool is extremely low, low-oxygen and low-energy-consumption operation is realized, meanwhile, an internal carbon source can be fully utilized, synchronous nitrification and denitrification are triggered, processes such as short-cut nitrification and denitrification dephosphorization and the like are realized, the effluent is superior to a first-level A standard, the impact resistance is strong, and the system operation is stable, efficient and energy-saving.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a plug-flow reaction tank of a plug-flow AAO system provided in the prior art.
FIG. 2 is a schematic diagram of a common AAO oxidation ditch pool type structure of an oxidation ditch system provided in the prior art.
FIG. 3 is a schematic view of the integrated sewage biological treatment system with low energy consumption according to the embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the specific contents of the present invention; it is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of the embodiments, and that no limitation to the present invention is intended. Based on the embodiment of the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The terms that may be used herein are first described as follows:
the term "and/or" means that either or both can be achieved, for example, X and/or Y means that both cases include "X" or "Y" as well as three cases including "X and Y".
The terms "comprising," "including," "containing," "having," or other similar terms of meaning should be construed as non-exclusive inclusions. For example: including a feature (e.g., material, component, ingredient, carrier, formulation, material, dimension, part, component, mechanism, device, process, procedure, method, reaction condition, processing condition, parameter, algorithm, signal, data, product, or article of manufacture), is to be construed as including not only the particular feature explicitly listed but also other features not explicitly listed as such which are known in the art.
The term "consisting of 823070 \8230composition" means to exclude any technical characteristic elements not explicitly listed. If used in a claim, the term shall render the claim closed except for the inclusion of the technical features that are expressly listed except for the conventional impurities associated therewith. If the term occurs in only one clause of the claims, it is defined only to the elements explicitly recited in that clause, and elements recited in other clauses are not excluded from the overall claims.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured," etc., are to be construed broadly, as for example: can be fixedly connected, can also be detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms herein can be understood by those of ordinary skill in the art as appropriate.
When concentrations, temperatures, pressures, dimensions, or other parameters are expressed as ranges of values, the ranges are to be understood as specifically disclosing all ranges formed from any pair of upper, lower, and preferred values within the range, regardless of whether ranges are explicitly recited; for example, if a numerical range of "2 to 8" is recited, then that numerical range should be interpreted to include ranges such as "2 to 7," "2 to 6," "5 to 7," "3 to 4 and 6 to 7," "3 to 5 and 7," "2 and 5 to 7," and the like. Unless otherwise indicated, the numerical ranges recited herein include both the endpoints thereof and all integers and fractions within the numerical range.
The terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in an orientation or positional relationship that is indicated based on the orientation or positional relationship shown in the drawings for ease of description and simplicity of description only, and are not intended to imply or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting herein.
The low-energy-consumption integrated sewage biological treatment system provided by the utility model is described in detail below. Details not described in the embodiments of the present invention belong to the prior art known to those skilled in the art. The embodiment of the present invention does not indicate specific conditions, and the operation is performed according to conventional conditions in the art or conditions suggested by the manufacturer. The reagent or the instrument used in the embodiment of the utility model does not indicate the manufacturer, and is a conventional product which can be purchased and obtained through market.
As shown in fig. 3, the embodiment of the present invention provides a low energy consumption integrated sewage biological treatment system, which includes:
the integrated circular main tank body 1 is internally provided with a circular secondary sedimentation tank 2 at the middle part, and a circular anaerobic tank 3, a circular anoxic tank 4 and a circular aerobic tank 5 are sequentially sleeved outside the circular secondary sedimentation tank 2 from inside to outside;
at least two flow impellers 6 are uniformly distributed in the annular anaerobic tank 3, the annular anoxic tank 4 and the annular aerobic tank 5;
a plurality of aerators 13 are uniformly distributed in the circular aerobic tank 5;
the circular anaerobic tank 3 is provided with a water inlet pipeline 9, and the side wall of the bottom of the circular anaerobic tank 3 is provided with a first water through hole 7 communicated with the inside of the circular anoxic tank 4;
a second water passing hole 8 communicated with the inside of the circular aerobic tank 5 is formed in the side wall of the bottom of the circular anoxic tank 4;
an inner reflux channel is arranged on the shared wall of the circular aerobic tank 5 and the circular anoxic tank 4;
the water outlet end of the circular aerobic tank 5 is communicated with the interior of the circular secondary sedimentation tank 2 through a secondary sedimentation tank water inlet pipeline;
the round secondary sedimentation tank 2 is internally connected with a secondary sedimentation tank water outlet pipeline 11 and a residual sludge discharge pipe 14 respectively;
the water inlet end of the circular anaerobic tank 3 is connected with the residual sludge discharge pipe 14 of the circular secondary sedimentation tank 2 through an external return pipeline provided with a sludge return pump.
In the system, the inner return channel is composed of a wall-through pump 12 arranged on the shared wall of the circular aerobic tank 5 and the circular anoxic tank 4.
In the above system, the two wall-through pumps 12 are arranged in parallel.
In the system, three variable-frequency flow impellers are uniformly distributed in the annular anaerobic tank 3, the annular anoxic tank 4 and the annular aerobic tank 5.
In the system, six groups of aerators 13 are arranged in the circular aerobic tank 5, each two groups of aerators are a unit, and the aerators in each group are uniformly distributed in the circular aerobic tank 5.
In the system, the positions of the aerator and the flow pusher in the annular aerobic tank 5 are staggered.
In the system, the water inlet pipeline 9 is connected to the bottom in the circular anaerobic tank 3.
The embodiment of the utility model provides a still provide a low energy consumption integrated form biological sewage treatment method, adopt foretell low energy consumption integrated form biological sewage treatment system, including following step:
sewage and return sludge of the secondary sedimentation tank are mixed and then enter the bottom of an annular anaerobic tank of the system through a water inlet pipeline, a circulating flow is formed in the annular anaerobic tank under the action of a flow impeller in the annular anaerobic tank, and anaerobic treatment for releasing phosphorus and decomposing organic matters is carried out in a circulating flow state;
the sewage after anaerobic treatment in the circular anaerobic tank enters the circular anoxic tank on the outer ring through a first water passing hole at the bottom of the circular anaerobic tank to be mixed with nitrate nitrogen which flows back from the circular aerobic tank through an internal return channel, and forms a circulating flow along the circular anaerobic tank under the action of a flow impeller in the circular anaerobic tank, and the denitrification treatment is carried out in the circulating flow state;
the sewage after denitrification treatment in the circular anoxic tank enters the circular aerobic tank through a second water passing hole at the bottom of the circular anoxic tank, a circulating flow is formed in the circular aerobic tank along the circular aerobic tank under the action of a flow impeller in the circular aerobic tank, and aerobic biochemical treatment for removing BOD, nitrification and absorbing phosphorus is performed under the action of a circulating flow and an aerator in the circular aerobic tank;
the sewage after aerobic biochemical treatment in the circular aerobic pool enters a circular secondary sedimentation pool in the middle of the system through a secondary sedimentation pool water inlet pipeline for sludge-water separation, and the residual sludge in the circular secondary sedimentation pool externally reflows to the circular anaerobic pool, the circular anoxic pool and the circular aerobic pool through an external reflow pipeline (the external reflow mode is the same as the traditional AAO external reflow mode, the biological sludge in the secondary sedimentation pool is discharged to a sludge reflow pump room and reflows to the water inlet end of the anaerobic circular anaerobic pool through a reflow pump) to ensure the sludge concentration in the biological pool (the biological pool refers to the circular anaerobic pool, the circular anoxic pool and the circular aerobic pool, and does not include a central secondary sedimentation pool); the sewage reaching the standard in the annular aerobic tank is discharged through a water outlet pipeline of the secondary sedimentation tank, and the residual activated sludge is discharged through a residual sludge discharge pipe.
In summary, the low energy consumption integrated biological sewage treatment system of the embodiment of the utility model adopts the integrated circular total tank body, and combines the circular anaerobic tank, the circular anoxic tank, the circular aerobic tank and the circular secondary sedimentation tank which form the biochemical tank, and the integrated tank is arranged in the integrated circular total tank body, and the arrangement is compact; under the action of the flow impellers arranged respectively, the circular anaerobic tank, the circular anoxic tank and the circular aerobic tank form complete mixed circulating flow, aeration oxygenation and stirring mixing can be completely separated without mutual influence, dissolved oxygen and ammonia nitrogen are almost the same at all positions in the circular aerobic tank, aeration according to needs can be easily realized, and aeration is uniform; the hydraulic condition is good, each anaerobic pool, each anoxic pool and each aerobic pool are circular, the stirring and plug flow power is extremely low, the operation with low oxygen and low energy consumption can be realized, the internal carbon source can be fully utilized, the processes of synchronous nitrification and denitrification, short-cut nitrification and denitrification, denitrification and dephosphorization and the like are triggered, the effluent is superior to the first-class A standard, the impact resistance is strong, and the system is stable, efficient and energy-saving in operation. Meanwhile, the integrated type arrangement pipeline is few, the pipeline system is simple, and the application range is wide.
In order to show the technical solutions and the technical effects provided by the present invention more clearly, the following detailed description is given by specific embodiments of the present invention for a low energy consumption integrated biological sewage treatment system.
Examples
As shown in fig. 3, an embodiment of the present invention provides an integrated low energy consumption biological sewage treatment system, including:
the middle part in the integrated round main tank body is a round secondary sedimentation tank which can adopt a peripheral inlet and outlet type or a central inlet and peripheral outlet type. The 2 nd, 3 rd, 4 circles outside the circular secondary sedimentation tank are respectively a ring-shaped anaerobic tank, a ring-shaped anoxic tank and a ring-shaped aerobic tank, the ring-shaped anaerobic tank, the ring-shaped anoxic tank and the ring-shaped aerobic tank are respectively and evenly provided with 2-3 flow pushers according to specific conditions, under the action of the flow pushers, the water flow in the ring-shaped anaerobic tank, the ring-shaped anoxic tank and the ring-shaped aerobic tank is smooth, the water flow is remarkably accelerated, an integral horizontal circulating flow can be formed in each tank, the circulating multiple can reach 30-50 times, meanwhile, the flow pushers can adopt variable-frequency flow pushers, and various operation working conditions can be flexibly matched. An aerator is arranged in the aerobic tank at a position avoiding the position of the impeller and used for providing dissolved oxygen for the circular aerobic tank, and an inner return channel from the circular aerobic tank to the circular anoxic tank is formed by a wall-through pump arranged on a shared wall of the two tanks and can return nitrate nitrogen in the circular aerobic tank to the circular anoxic tank for denitrification reaction.
The integrated low-energy-consumption biological sewage treatment system comprises the following specific processes:
the sewage and the return sludge of the secondary sedimentation tank are mixed and then enter a 2 nd circle of circular anaerobic tank in the integrated circular total tank body through a water inlet pipeline at the bottom of the tank, the circular anaerobic tank has the main functions of releasing phosphorus and decomposing organic matters, under the action of facultative anaerobic zymogens, part of macromolecular organic matters which are easy to biodegrade are converted into micromolecular Volatile Fatty Acids (VFA), phosphorus-accumulating bacteria absorb the micromolecular organic matters to synthesize poly-beta-hydroxybutyrate (PHB) and store the poly-beta-hydroxybutyrate (PHB) in cells, and the phosphorus accumulation in the cells is hydrolyzed into orthophosphate and released into water.
Waste water in the circular ring-shaped anaerobic tank forms a tank internal circulating flow through a plug flow device and enters a circular ring-shaped anoxic tank of the 3 rd circle in the integrated circular main tank body through a first water passing hole at the bottom, and the tank has the main function of denitrification. NO (nitric oxide) 3 - the-N is sent by the circular aerobic tank through a wall-through pump in a backflow way, and the denitrifying bacteria utilize organic matters in the sewage to remove NO 3 - Reduction of NO by-N 2 - -N, re-reduction to N 2 Released into the air, and thus the organic matter concentration and NO 3 - the-N concentration is greatly reduced.
Waste water in the circular anoxic tank forms a tank internal circulating flow through the impeller and enters the circular aerobic tank of the 4 th circle in the integrated circular total tank body through the second water passing hole at the bottom, and the circular anoxic tank mainly has the functions of removing BOD, nitrifying and absorbing phosphorus. The concentration of organic matters in the mixed solution is low, the phosphorus-accumulating bacteria mainly rely on PHB stored in a decomposer to obtain the capacity for self growth and reproduction, and simultaneously, the phosphorus-accumulating bacteria excessively absorb soluble orthophosphate in water, store the soluble orthophosphate in the body in the form of polyphosphate, and separate phosphorus from water through precipitation. The organic matter is degraded by the microorganisms and continues to descend. NH (NH) 4 + -N is first converted to NO by aerobic microorganisms 2 - -N, reconversion to NO 3 — -N, effecting a nitration reaction.
Waste water in the circular aerobic tank forms a tank internal circulating flow through a plug flow device, enters the 1 st circle of circular secondary sedimentation tank in the integrated circular total tank body through a secondary sedimentation tank water inlet pipeline at the bottom to carry out mud-water separation, ensures the sludge concentration in the biological tank through external reflux, and discharges redundant activated sludge through a residual sludge discharge pipe. And the sewage after passing through the secondary sedimentation tank is discharged after reaching the standard through a water outlet pipeline, or is discharged after reaching the standard after being subjected to advanced treatment.
To sum up, the utility model discloses integrated form low energy consumption sewage biological treatment system has following advantage at least:
1) The integrated circular total tank body integrates the biochemical tank and the secondary sedimentation tank to form a complete mixed circulating flow, the aeration oxygenation and the stirring mixing are completely separated and do not influence each other, the aeration quantity can be regulated and controlled as required, the energy consumption of the plug flow and the stirring is extremely low, and the low-oxygen and low-energy operation can be realized.
Because of the degradation rate of activated sludge system to COD is far more than the degradation rate to the ammonia nitrogen, consequently can regard as the aeration rate enough when the ammonia nitrogen realization reaches standard, the utility model discloses evenly set up the multiunit aerator in the ring shape aerobic tank, dissolved oxygen and ammonia nitrogen are almost the same everywhere, realization that can be very easy is to the on-demand control of aeration rate, consumption reduction low oxygen operation, and the low oxygen environment triggers synchronous nitrification-denitrification simultaneously easily, and short-cut nitrification-denitrification, processes such as denitrification dephosphorization, but make full use of internal carbon source, system operation high efficiency is stable energy-conservation.
Meanwhile, the anaerobic tank, the anoxic tank and the aerobic tank are all circular tank bodies, hydraulic conditions are good, stirring and plug flow energy consumption is extremely low, the plug flow device adopts a variable-frequency plug flow device, different working conditions are adapted, the actual plug flow power is far less than that of other rectangular tanks, and the power density can be less than 3w/m 3 And the energy-saving effect is good.
2) Under the action of the respective flow impellers of the anaerobic tank, the anoxic tank and the aerobic tank, the circulation flow in the tank is 30-50 times of the flow of raw water, the stability of the system is enhanced, the change of the water quantity and the water quality of the incoming water can be fully responded, and the impact load resistance of the system is strong.
3) The integrated arrangement is adopted, the biochemical tank and the secondary sedimentation tank are combined, the occupied area is compact, the pipelines are few, the pipeline system is simple, and the application range is wide.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
Claims (7)
1. A low energy consumption integrated biological sewage treatment system, comprising:
the integrated circular main tank body (1), the middle part in the integrated circular main tank body (1) is a circular secondary sedimentation tank (2), and a circular anaerobic tank (3), a circular anoxic tank (4) and a circular aerobic tank (5) are sequentially sleeved outside the circular secondary sedimentation tank (2) from inside to outside;
at least two flow impellers (6) are uniformly distributed in the annular anaerobic tank (3), the annular anoxic tank (4) and the annular aerobic tank (5);
a plurality of aerators (13) are uniformly distributed in the circular aerobic tank (5);
the circular anaerobic tank (3) is provided with a water inlet pipeline (9), and the side wall of the bottom of the circular anaerobic tank (3) is provided with a first water passing hole (7) communicated with the inside of the circular anoxic tank (4);
a second water passing hole (8) communicated with the inside of the annular aerobic tank (5) is formed in the side wall of the bottom of the annular anoxic tank (4);
an inner reflux channel is arranged on the shared wall of the circular aerobic tank (5) and the circular anoxic tank (4);
the water outlet end of the circular aerobic tank (5) is communicated with the interior of the circular secondary sedimentation tank (2) through a secondary sedimentation tank water inlet pipeline (10);
a secondary sedimentation tank water outlet pipeline (11) and a residual sludge discharge pipe (14) are respectively connected in the circular secondary sedimentation tank (2);
the water inlet end of the circular anaerobic tank (3) is connected with a residual sludge discharge pipe (14) of the circular secondary sedimentation tank (2) through an outer return pipeline provided with a sludge return pump.
2. Low energy consumption integrated wastewater biological treatment system according to claim 1, characterized in that the internal return channel is formed by a through-wall pump (12) arranged on the common wall of the annular aerobic tank (5) and the annular anoxic tank (4).
3. The low energy consumption integrated wastewater biological treatment system according to claim 2, wherein the through-wall pump is two pumps arranged in parallel.
4. The integrated sewage biological treatment system with low energy consumption according to any one of claims 1 to 3, wherein three variable-frequency flow impellers are uniformly distributed in the annular anaerobic tank (3), the annular anoxic tank (4) and the annular aerobic tank (5).
5. Low energy consumption integrated wastewater biological treatment system according to any one of claims 1 to 3, characterized in that the number of aerators in the circular aerobic tank (5) is six, each two aerators are in a group, and each group of aerators is uniformly distributed in the circular aerobic tank (5).
6. The integrated sewage biological treatment system with low energy consumption according to claim 5, wherein the position of the aerator and the position of the flow pushing device in the circular aerobic tank (5) are staggered.
7. Low energy consumption integrated wastewater biotreatment system according to any one of claims 1 to 3, characterized in that the water inlet pipe is connected to the bottom inside the annular anaerobic tank (3).
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