CN210915759U - Multistage A/O sewage treatment system - Google Patents
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- CN210915759U CN210915759U CN201921841949.9U CN201921841949U CN210915759U CN 210915759 U CN210915759 U CN 210915759U CN 201921841949 U CN201921841949 U CN 201921841949U CN 210915759 U CN210915759 U CN 210915759U
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Abstract
The utility model provides a multi-stage A/O sewage treatment system, which comprises a first-stage sewage biochemical treatment unit, a second-stage sewage biochemical treatment unit and a third-stage sewage biochemical treatment unit which are connected in sequence according to the sewage treatment flow direction, wherein a coagulation reaction tank, a sedimentation tank and a filtering tank are arranged behind the third-stage sewage biochemical treatment unit; the first-stage sewage biochemical treatment unit comprises a first-stage anaerobic tank, a first-stage anoxic tank and a first-stage aerobic tank which are sequentially connected, wherein a first-stage anoxic cutoff zone is arranged in the first-stage aerobic tank; the second-stage sewage biochemical treatment unit comprises a second-stage aerobic tank and a second-stage anoxic intercepting area arranged in the second-stage aerobic tank; the third-stage sewage biochemical treatment unit comprises a second-stage anaerobic tank and a third-stage aerobic tank, wherein a third-stage anoxic intercepting area is arranged in the third-stage aerobic tank. The utility model discloses, through anaerobism, oxygen deficiency, good oxygen combination in turn, form the multistage AO operation technology that is concentration gradient, strengthen biological nitrogen and phosphorus removal, strengthen biological nitrogen removal effect very much, realize the mud decrement simultaneously.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, concretely relates to multistage AO sewage treatment system.
Background
The A/A/O (anaerobic/anoxic/aerobic) process is an activated sludge process for treating sewage to remove organic pollutants, nitrogen, phosphorus and the like in water by anaerobic, anoxic and aerobic biological treatment. The process is a sewage treatment process with mature technology and wide application, and is also one of the main processes for treating town sewage.
The A/A/O process can simultaneously carry out biological nitrogen and phosphorus removal, but the biological nitrogen removal effect is influenced by the reflux ratio of the mixed liquor, and the reflux ratio needs to be increased to obtain higher nitrogen removal rate, so that the energy consumption is increased and the anoxic environment of the anoxic tank can be damaged to influence the biological nitrogen removal. Meanwhile, the process has the defects that the biological denitrification and the biological phosphorus removal are difficult to achieve good effects at the same time, and the like.
With the improvement of the requirements on the quality of the water environment, the discharge requirements on sewage treatment are more strict, more and more water discharged from urban sewage treatment plants meet the first-class A standard or reuse standard of pollutant discharge Standard of urban sewage treatment plants (GB18918-2002), and part of important water environment protection areas meet the standard of quasi IV-class water quality of the quality Standard of surface Water Environment (GB 3838-2002). For sewage with small scale, large change of water quality and quantity and high pollutant concentration, especially nitrogen and phosphorus, the conventional A2the/O process is difficult to realize stable standard-reaching and flexible process transformation.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a multi-stage A/O sewage treatment system, which ensures the stability and flexibility of sewage treatment.
In order to achieve the above objects and other related objects, the technical solution of the present invention is as follows:
the utility model provides a multistage AO sewage treatment system which characterized in that: the device comprises a first-stage sewage biochemical treatment unit, a second-stage sewage biochemical treatment unit and a third-stage sewage biochemical treatment unit which are sequentially connected according to the sewage treatment flow direction, wherein a deep treatment unit is arranged behind the third-stage sewage biochemical treatment unit and comprises a coagulation reaction tank, a sedimentation tank and a filtering tank; the water outlet of the first stage sewage biochemical treatment unit is connected with the water inlet of the second stage sewage biochemical treatment unit, and the water outlet of the second stage sewage biochemical treatment unit is connected with the water inlet of the third stage biochemical treatment unit; the first-stage sewage biochemical treatment unit comprises a first-stage anaerobic tank, a first-stage anoxic tank and a first-stage aerobic tank which are sequentially connected, and a first-stage anoxic cutoff zone is arranged in the water outlet end of the first-stage aerobic tank; the second-stage sewage biochemical treatment unit comprises a second-stage aerobic tank and a second-stage anoxic intercepting area which is arranged at the water outlet end of the second-stage aerobic tank; the third-stage sewage biochemical treatment unit comprises a second-stage anaerobic tank and a third-stage aerobic tank which are connected, and a third-stage anoxic cutoff area is arranged in the water outlet end of the third-stage aerobic tank.
When the sewage treatment system of the utility model operates, a multi-stage A/O operation process with concentration gradient is formed by alternately combining anaerobic treatment, anoxic treatment and aerobic treatment, biological nitrogen and phosphorus removal is enhanced, and the biological nitrogen and phosphorus removal effect is particularly enhanced; an anoxic interception area is arranged in the water outlet end of the aerobic tank, and the anoxic interception area has the functions of intercepting sludge and denitrifying at the same time, so that the activated sludge of each level of biochemical unit forms a system; a load gradient is formed by grading, the first-stage conventional load operation, the second-stage lower load operation and the third-stage ultra-low load operation are performed, the removal of organic matters and biological denitrification are enhanced, and the sludge reduction is realized; and carrying out chemical phosphorus removal and further removing refractory organic matters and fine suspended matters from the effluent through coagulating sedimentation, and further removing the suspended matters through filtering to realize high-quality effluent.
Optionally, the primary anoxic cutoff zone is internally arranged at the water outlet end of the primary aerobic tank, and the secondary anoxic cutoff zone is internally arranged at the water outlet end of the secondary aerobic tank; the three-stage anoxic interception zone is arranged at the water outlet end of the three-stage aerobic tank.
Optionally, filler regions are arranged in the first-stage anoxic cutoff region, the second-stage anoxic cutoff region and the third-stage anoxic cutoff region, and each filler region comprises an upper rectifying grid cover plate, a lower rectifying grid cover plate and spherical fillers arranged between the upper rectifying grid and the lower rectifying grid.
Optionally, slopes for internal reflux of sludge are arranged at the bottoms of the first-stage anoxic interception area, the second-stage anoxic interception area and the third-stage anoxic interception area, and the lower part of the filler area of each stage of anoxic interception area is communicated with the bottom of the corresponding aerobic tank, so that unpowered internal reflux of sludge is realized.
Optionally, the combined type filler is arranged in the primary anaerobic tank, the primary anoxic tank, the primary aerobic tank, the secondary anaerobic tank and the tertiary aerobic tank.
Optionally, aerators are arranged at the bottoms of the first-stage aerobic tank, the second-stage aerobic tank and the third-stage aerobic tank, the aerators are connected with an air blower through pipelines, valves are arranged on the pipelines and used for adjusting aeration quantity or closing aeration, and after the aeration is closed, the aerobic tanks can run in an anaerobic or anoxic mode.
Optionally, tertiary good oxygen pond sets up the mixed liquid backward flow, is connected to one-level anaerobism pond, one-level oxygen deficiency pond, second grade good oxygen pond and second grade anaerobism pond through return line, the mixed liquid backward flow is through the backwash pump backward flow, sets up control flap on each back flow line respectively.
Optionally, the sedimentation tank is a vertical sedimentation tank, and a frame-type stirrer is arranged in the coagulation reaction tank for mechanical mixing.
Optionally, a fiber bundle filler filtering area is arranged in the filtering tank.
Optionally, the filtration tank is backwashed by effluent of the sedimentation tank, and a backwash pump is arranged on the backwash pipeline.
Optionally, the bottom of the first-stage anaerobic tank, the first-stage anoxic tank and the second-stage anaerobic tank is provided with a sludge discharge hopper and a sludge discharge pipe for discharging dead sludge and inorganic sludge of the biochemical treatment system, and the first-stage aerobic tank and the second-stage aerobic tank discharge sludge through the sludge discharge pipe.
Optionally, the combination mode of the primary biochemical treatment unit, the secondary biochemical treatment unit, the tertiary biochemical treatment unit and the advanced treatment unit can be optimized and combined according to the land use situation.
As mentioned above, the utility model has the advantages that: when the sewage treatment system of the utility model operates, a multi-stage A/O operation process with concentration gradient is formed by alternately combining anaerobic treatment, anoxic treatment and aerobic treatment, biological nitrogen and phosphorus removal is enhanced, and the biological nitrogen and phosphorus removal effect is particularly enhanced; an anoxic zone is arranged in the water outlet end of the aerobic tank, and the aerobic tank has the functions of sludge interception and denitrification so that all levels of sludge form a system; the load gradient is formed by grading, the first-stage conventional load operation state, the second-stage low-load operation and the third-stage ultra-low-load operation are realized, the organic matter removal and biological denitrification are enhanced, and the sludge yield is reduced; the conversion between anoxic and anaerobic operation modes can be realized by opening and closing a valve of the mixed solution return pipe; the aerobic and anaerobic operation modes can be switched by opening and closing the aeration pipe; the system is not provided with sludge backflow, sludge is reduced in a biochemical system, and only a small amount of dead sludge and inorganic sludge are discharged; and carrying out chemical phosphorus removal and further removing refractory organic matters and fine suspended matters from the effluent through coagulating sedimentation, and further removing the suspended matters through filtering to obtain high-quality effluent.
Drawings
Fig. 1 is a schematic layout of the present invention;
FIG. 2 is a diagram of the apparatus and piping arrangement of the present invention;
FIG. 3 is a view A-A of FIG. 2 according to the present invention;
FIG. 4 is a view B-B of FIG. 2 according to the present invention;
FIG. 5 is a view of the present invention taken from C-C of FIG. 2;
fig. 6 is a schematic view of the flow direction of the pipeline according to the present invention.
Description of reference numerals
1-first-stage anaerobic tank; 2-a first-stage anoxic tank; 3-a first-stage aerobic tank; 4-a first-stage anoxic cutoff zone; 5-a secondary aerobic tank; 6-a secondary anoxic cutoff zone; 7-a secondary anaerobic tank; 8-three-stage aerobic tank; 9-a tertiary anoxic cutoff zone; 10-a coagulation reaction tank; 11-a sedimentation tank; 12-a filtration tank; 13-water distribution tank; 14-water through holes; 15-an effluent weir; 16-a mud bucket; 17 a-a water inlet pipe; 17 b-a sludge discharge pipe; 17 c-air tube; 17 d-a dosing tube; 17 e-a water outlet pipe; 17 f-backwash tube; 17 g-sewage pipe in the pool; 17 h-a mixed liquid return pipe; 17 i-perforating a sludge discharge pipe; 17 j-perforated water distribution pipes; 18 a-mixed liquor reflux pump; 18 b-a backwash pump; 19-a stirrer; 20-a guide shell; 21-a biochemical filler region; 22-a fibrous packing filtration zone; 23-a spherical packing filtration zone; 24-a rectifying grid cover plate; 25-slope; 26-bracket support.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Examples
As shown in fig. 1 to 5, a multi-stage a/O sewage treatment system includes a first stage sewage biochemical treatment unit, a second stage sewage biochemical treatment unit, and a third stage sewage biochemical treatment unit connected in sequence according to a sewage treatment flow direction, wherein a deep treatment unit is disposed behind the third stage sewage biochemical treatment unit, and the deep treatment unit includes a coagulation reaction tank 10, a sedimentation tank 11, and a filtration tank 12.
The first-stage sewage biochemical treatment unit comprises a first-stage anaerobic tank 1, a first-stage anoxic tank 2 and a first-stage aerobic tank 3 which are sequentially connected, wherein the first-stage anaerobic tank 1 is connected with a water inlet pipe 17 a; a primary anoxic cutoff area 4 is arranged in the primary aerobic tank 3; the second-stage sewage biochemical treatment unit comprises a second-stage aerobic tank 5 and a second-stage anoxic intercepting zone 6 which is arranged in the second-stage aerobic tank 5; the third-stage sewage biochemical treatment unit comprises a second-stage anaerobic tank 7 and a third-stage aerobic tank 8 which are connected, and a third-stage anoxic cutoff area 9 is arranged in the third-stage aerobic tank 8.
The primary anoxic interception area 4 is arranged in the water outlet end of the primary aerobic tank 3 and is used for intercepting sludge and denitrifying for enabling the primary sewage biochemical treatment unit to form an independent sludge system; the secondary anoxic interception area 6 is arranged in the water outlet end of the secondary aerobic tank 5 and is used for intercepting sludge and denitrifying for enabling the secondary sewage biochemical treatment unit to form an independent sludge system; the third-stage anoxic interception area 9 is arranged in the water outlet end of the third-stage aerobic tank 8 and is used for intercepting sludge and denitrifying for enabling the third-stage sewage biochemical treatment unit to form an independent sludge system.
The anaerobic cutoff area is arranged in the aerobic tank, a cutoff sludge area is isolated at the water outlet end of the aerobic tank, unpowered backflow of sludge in the aerobic tank is realized, and simultaneously denitrification environment enhanced biological denitrification is formed, so that on one hand, sludge of a previous biochemical treatment unit is reduced to enter a next-stage treatment unit, activated sludge of biochemical systems of three units is made to form a system, a concentration gradient is formed in the process, and on the other hand, higher sludge concentration of each-stage treatment unit is kept.
The primary anaerobic tank 1 is connected with the primary anoxic tank 2, the primary anoxic tank 2 is connected with the primary aerobic tank 3, the primary anoxic cutoff zone 4 is connected with the secondary aerobic tank 5, the secondary anoxic cutoff zone 6 is connected with the secondary anaerobic tank 7, and the secondary anaerobic tank 7 is connected with the tertiary aerobic tank 8 through water through holes 14(14a, 14b, 14c, 14d and 14 e). The primary aerobic tank 3, the secondary anoxic cutoff zone 6, the secondary anaerobic tank 7 and the tertiary anoxic cutoff zone 9 are respectively provided with water distribution tanks 13(13a, 13b, 13c and 13d) to ensure uniform water distribution.
The second-stage anaerobic tank 7 is mainly used for degrading the persistent macromolecular organic matters in the sewage after the second-stage biochemical treatment into micromolecular organic matters with good biodegradability through the anaerobic action, and then further decomposing and removing the micromolecular organic matters in the third-stage aerobic tank 8.
When the sewage treatment system of the utility model operates, a multi-stage A/O operation process with concentration gradient is formed by alternately combining anaerobic treatment, anoxic treatment and aerobic treatment, biological nitrogen and phosphorus removal is enhanced, the biological nitrogen and phosphorus removal effect is particularly enhanced, and sludge reduction is realized at the same time; an anoxic interception area is arranged in the water outlet end of the aerobic tank, so that the anaerobic digestion tank has the functions of intercepting sludge and denitrifying, and realizes unpowered reflux of the sludge, so that all levels of sludge form a system; a load gradient is formed by grading, the first-stage conventional load operation state and the second-stage lower load operation are favorable for the growth of autotrophic nitrifying bacteria, and the third-stage ultralow load operation is favorable for the growth of autotrophic nitrifying bacteria because microorganisms are in an endogenous respiration stage; only a small amount of inactive dead sludge and inorganic sludge are discharged during the operation of the whole system, and the sludge reduction in the system is realized. And the advanced treatment of coagulating sedimentation and filtration is carried out after the third-stage sewage biochemical treatment unit, chemical phosphorus removal and further removal of residual pollutants such as SS, COD, BOD and the like are carried out, and the quality of the effluent is ensured.
In this example, the first stage anoxic cutoff zone 4, the second stage anoxic cutoff zone 6 and the third stage anoxic cutoff zone 9 are all provided with a filler zone, the filler zone comprises an upper rectifying grille cover plate 24, a lower rectifying grille cover plate 24 and spherical fillers arranged between the upper rectifying grille plate and the lower rectifying grille plate, the upper rectifying grille plate and the lower rectifying grille plate are glass fiber reinforced plastic grilles and play roles in supporting the fillers and rectifying and distributing water, and the upper rectifying grille plate and the lower rectifying grille plate are fixedly arranged on corresponding upper bracket supports 26 and lower bracket supports 26.
The bottoms of the primary anoxic interception area 4, the secondary anoxic interception area 6 and the tertiary anoxic interception area 9 are communicated with the corresponding aerobic tanks, the bottoms of the primary anoxic interception area 4, the secondary anoxic interception area 6 and the tertiary anoxic interception area 9 are provided with slopes 25 for internal reflux of sludge, and the sludge can be subjected to unpowered reflux.
Wherein, install combination formula biofilm carrier in one-level anaerobism pond 1, one-level oxygen deficiency pond 2, one-level good oxygen pond 3, second grade good oxygen pond 5, second grade anaerobism pond 7, the good oxygen pond 8 of tertiary, form biochemical filler district 21, make biochemical system have the advantage of active sludge and biomembrane concurrently, improve mud concentration and microorganism kind, the length of extension microorganism chain, the bracket mounting that packs is on the bracket support 26 that sets up in each pond.
The bottom parts of the first-stage aerobic tank 3, the second-stage aerobic tank 5 and the third-stage aerobic tank 8 are provided with aerators, and the aerators are connected with an air blower through an air pipe 17c to perform blast aeration; and valves are arranged on the branch pipelines and are used for adjusting aeration quantity or closing aeration.
The bottoms of the primary anaerobic tank 1, the primary anoxic tank 2 and the secondary anaerobic tank 7 are respectively provided with a sludge discharge hopper 16, sludge is sucked through a perforated sludge discharge pipe 17i, and sludge is discharged through a sludge discharge pipe 17 b; the first-stage aerobic tank 3 and the second-stage aerobic tank 5 discharge mud through a mud discharge pipe 17b, and the mud discharge pipe can be used as an emptying pipe at the same time; the sludge discharge pipe of the anaerobic tank can be used as an emptying pipe. The whole biochemical system is not provided with sludge backflow, and the sludge is subjected to unpowered backflow in the system.
The three-level aerobic tank 8 is respectively connected to the first-level anaerobic tank 1, the first-level anoxic tank 2, the first-level aerobic tank 3, the second-level aerobic tank 5 and the second-level anaerobic tank 7 through a mixed liquid return pipe 17h, a mixed liquid return pump 18a is arranged on a main pipeline of the mixed liquid return pipe 17h, and a control valve is arranged on each branch pipe of the mixed liquid return pipe 17 h.
Wherein, the coagulation reaction tank 10 is mainly added with a coagulant for chemical phosphorus removal and is connected with a dosing pipe 17 d; the sedimentation tank 11 and the filtering tank 12 are used for removing suspended matters and a small amount of residual organic matters, the guide flow cylinders 20 are arranged in the sedimentation tank 11 and the filtering tank 12, and the filtering tank 12 is connected with the water outlet pipe 17 e. A sewage pipe 17g in the tank is respectively connected between the coagulation reaction tank 10 and the sedimentation tank 11 and between the sedimentation tank 11 and the filter tank 12, and the sewage pipe 17g in the tank is connected with a water outlet weir at the previous stage and is used for draining sewage from the previous stage to the next stage; the sedimentation tank 11 is a vertical flow sedimentation tank, a frame type stirrer 19 is arranged in the coagulation reaction tank 10 for mechanical mixing, and the sedimentation tank 11 and the filtering tank 12 are respectively provided with an effluent weir 15. The filter tank 12 is internally provided with fiber bundle filler to form a fiber filler filtering area 22, the filter tank 12 is connected with the sedimentation tank 11 through a back flushing pipe 17f, and the back flushing pipe 17f is provided with a back flushing pump 18 b.
Fig. 6 is a schematic view of the pipeline flow direction of the present invention, wherein KQ is an air pipeline, N represents a sludge pipe, and W represents a sewage pipe; PAC (polyaluminium chloride) and PAM (polyacrylamide) are used as dosing tubes.
The multi-stage A/O sewage treatment system of the utility model is suitable for small town sewage treatment, especially for the occasions with large water quality and water quantity fluctuation, high influent nitrogen and phosphorus concentration and high effluent water quality requirement, and also suitable for small industrial wastewater treatment which mainly removes organic matters, nitrogen and phosphorus; when the biological treatment device is used for treating similar large and medium municipal sewage and industrial wastewater, the biochemical tank can be implemented according to an activated sludge method. The water quality of the inlet water of the system needs to be simply pretreated, and the water quality of the inlet water can meet the following requirements: COD is less than or equal to 500mg/L, B/C is more than or equal to 0.25, SS is less than or equal to 100mg/L, TN is more than or equal to 50mg/L and less than or equal to 80mg/L, TP is more than or equal to 5mg/L and less than or equal to 8mg/L, and PH is 6-9. The effluent quality can reach: COD is less than or equal to 40mg/L, BOD is less than or equal to 8mg/L, SS is less than or equal to 8mg/L, TP is less than or equal to 0.4mg/L, TN is less than or equal to 3mg/L, and NH3-N≤2mg/L。
Wherein, COD: chemical Oxygen demand cod (chemical Oxygen demand); BOD:biological oxygen demand bod (biochemical oxygen demand); TN: total nitrogen tn (total nitrogen); and SS: suspensions (suspended solids); TP: total nitrogen; NH (NH)3-N: ammonia nitrogen; B/C: BOD (biological oxygen demand) to COD (chemical oxygen demand).
The first-stage biochemical treatment system of the multi-stage A/O sewage treatment system operates according to the conventional load; the second-stage biochemical treatment system operates according to low load; and the second stage biochemical treatment system operates according to ultra-low load.
The pretreated sewage firstly enters a first-stage biochemical treatment system. In the first-stage biochemical treatment system, the hydraulic retention time of a first-stage anaerobic tank 1 is 2-4 h, the hydraulic retention time of a first-stage anoxic tank 2 is 3-5 h, the hydraulic retention time of a first-stage aerobic tank 3 is 6-8 h, and the hydraulic retention time of a built-in anoxic intercepting area is 1-2 h. The first-stage biochemical treatment system has an effluent water quality range: COD is more than or equal to 100mg/L and less than or equal to 200mg/L, BOD is more than or equal to 50mg/L and less than or equal to 100mg/L, and TN is more than or equal to 25mg/L and less than or equal to 50 mg/L.
The effluent of the first-stage biochemical treatment system enters a second-stage biochemical treatment system, the second-stage biochemical treatment system and a second-stage aerobic pool 5, the hydraulic retention time is 4-6 hours, and the hydraulic retention time of the built-in anoxic interception area is 1-2 hours. The water quality range of the effluent of the second-stage biochemical treatment system is as follows: COD is more than or equal to 40mg/L and less than or equal to 80mg/L, BOD is more than or equal to 15mg/L and less than or equal to 30mg/L, and TN is more than or equal to 10mg/L and less than or equal to 15 mg/L.
And the effluent of the second-stage biochemical treatment system enters a third-stage biochemical treatment system, wherein the hydraulic retention time of a second-stage anaerobic tank 7 is 3-5 h, the hydraulic retention time of a third-stage aerobic tank 8 is 3-5 h, and the hydraulic retention time of a built-in anoxic interception area is 1.5-2.5 h. The third-stage biochemical treatment system has the effluent water quality range: COD is less than or equal to 40mg/L, BOD is less than or equal to 10mg/L, TN is less than or equal to 3.5mg/L, NH3-N≤2.5mg/L。
The first-stage, second-stage and third-stage biochemical treatment systems discharge dead sludge and inorganic sludge deposited at the bottom to a sludge tank for sludge treatment and disposal.
And sewage treatment fillers such as combined fillers are arranged in the first-stage anaerobic tank 1, the first-stage anoxic tank 2, the first-stage aerobic tank 3, the second-stage aerobic tank 5, the second-stage anaerobic tank 7 and the third-stage aerobic tank 8, so that the biochemical system has the advantages of activated sludge and biomembrane.
In the third-stage biochemical treatment system, after the outlet water passes through the third-stage anoxic interception area 9 to intercept sludge, the water quality meets the inlet water quality requirement of the coagulation reaction, and the outlet water directly enters the subsequent coagulation precipitation reaction without independently arranging a sedimentation tank.
In the multi-stage A/O sewage treatment system, the mixed liquor in the three-stage aerobic tank 8 flows back to the first-stage anaerobic tank 1, the first-stage anoxic tank 2, the second-stage aerobic tank 5 and the second-stage anaerobic tank 7 through the mixed liquor reflux pump 18 a.
The sedimentation tank 11 adopts a vertical flow sedimentation tank, the stirrer 19 adopts a frame type stirrer, the guide cylinder 20 is designed according to the guide cylinder of the vertical flow sedimentation tank 11, the filter tank adopts fiber bundle filling, a backwashing pump 18b is adopted, and the effluent of the sedimentation tank 11 is utilized for backwashing.
The multi-stage A/O sewage treatment system can reduce secondary biochemical treatment systems according to the water quality of inlet water and the water outlet requirement.
The first-stage aerobic tank 3, the second-stage aerobic tank 5 and the third-stage aerobic tank 8 adopt blowers for aeration, and the aeration quantity can be adjusted or the aeration is closed through a valve during operation, so that the operation is carried out according to an anoxic or anaerobic process. When the aerobic tank discharges the sludge, the aeration is stopped, and the aerobic tank is kept still for a period of time.
The built-in first-stage anoxic cutoff region 4, the built-in second-stage anoxic cutoff region 6 and the built-in third-stage anoxic cutoff region 9 are respectively provided with a spherical filler to form a spherical filler filtering region 23, the upper part and the lower part of the spherical filler filtering region are fixed by a flow-adjusting grating cover plate 24, and the bottom of the spherical filler filtering region is provided with a sludge internal reflux slope 25.
The built-in first-stage anoxic interception area 4, the built-in second-stage anoxic interception area 6 and the built-in third-stage anoxic interception area 9 are used for supplying carbon sources including residual organic matters in sewage and carbon sources provided by endogenous respiration of sludge during denitrification, and the carbon sources can be added additionally when necessary.
The second-stage anaerobic tank 7 is mainly used for degrading the persistent macromolecular organic matters in the effluent of the second-stage biochemical treatment system into biodegradable micromolecular organic matters through anaerobic action and further decomposing the biodegradable micromolecular organic matters in the third-stage aerobic tank 8.
In the coagulation reaction tank 10, a coagulant is mainly added to carry out chemical phosphorus removal; and after the effluent is subjected to mud-water separation in the sedimentation tank 11, the effluent is filtered in the filter tank 12 to further remove pollutants such as SS.
When the sewage treatment system of the utility model operates, a multi-stage A/O operation process with concentration gradient is formed by alternately combining anaerobic treatment, anoxic treatment and aerobic treatment, biological nitrogen and phosphorus removal is enhanced, and the biological nitrogen and phosphorus removal effect is particularly enhanced; an anoxic interception area is arranged in the water outlet end of the aerobic tank, and the anoxic interception area has the functions of intercepting sludge and denitrifying at the same time, so that unpowered backflow of the sludge is realized, and all levels of sludge form a system; a load gradient is formed by classification, the first-stage conventional load operation state, the second-stage low-load operation and the third-stage ultra-low-load operation are realized, the removal of organic matters is strengthened, and the sludge yield is reduced; the conversion between anoxic and anaerobic operation modes can be realized by opening and closing a valve of the nitrifying liquid return pipe; the aerobic and anaerobic operation modes can be switched by opening and closing the aeration valve; the system is not provided with sludge backflow, and the sludge is subjected to unpowered backflow in the system; sludge is reduced in a biochemical system, and only a small amount of dead sludge and inorganic sludge are discharged; and carrying out chemical phosphorus removal and further removing refractory organic matters and fine suspended matters from the effluent through coagulating sedimentation, and further removing the suspended matters through filtering to obtain high-quality effluent.
Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a multistage AO sewage treatment system which characterized in that: the device comprises a first-stage sewage biochemical treatment unit, a second-stage sewage biochemical treatment unit and a third-stage sewage biochemical treatment unit which are sequentially connected according to the sewage treatment flow direction, wherein an advanced treatment unit is arranged behind the third-stage sewage biochemical treatment unit and comprises a coagulation reaction tank, a sedimentation tank and a filtering tank; the water outlet of the first stage sewage biochemical treatment unit is connected with the water inlet of the second stage sewage biochemical treatment unit, and the water outlet of the second stage sewage biochemical treatment unit is connected with the water inlet of the third stage sewage biochemical treatment unit; the first-stage sewage biochemical treatment unit comprises a first-stage anaerobic tank, a first-stage anoxic tank and a first-stage aerobic tank which are sequentially connected, and a first-stage anoxic cutoff zone is arranged in the water outlet end of the first-stage aerobic tank; the second-stage sewage biochemical treatment unit comprises a second-stage aerobic tank and a second-stage anoxic intercepting area which is arranged at the water outlet end of the second-stage aerobic tank; the third-stage sewage biochemical treatment unit comprises a second-stage anaerobic tank and a third-stage aerobic tank which are connected, and a third-stage anoxic cutoff area is arranged in the water outlet end of the third-stage aerobic tank.
2. The multi-stage a/O wastewater treatment system of claim 1, wherein: and the filler areas are arranged in the primary anoxic interception area, the secondary anoxic interception area and the tertiary anoxic interception area and comprise an upper rectifying grating cover plate, a lower rectifying grating cover plate and spherical biological fillers arranged between the upper rectifying grating cover plate and the lower rectifying grating cover plate.
3. The multi-stage a/O wastewater treatment system of claim 1, wherein: slopes for internal reflux of sludge are arranged at the bottoms of the primary anoxic interception area, the secondary anoxic interception area and the tertiary anoxic interception area, and the lower part of the filler area of each stage of anoxic interception area is communicated with the bottom of the corresponding aerobic tank, so that unpowered reflux of sludge to the aerobic tank is realized.
4. The multi-stage a/O wastewater treatment system of claim 1, wherein: the combined biological filler is arranged in the first-stage anaerobic tank, the first-stage anoxic tank, the first-stage aerobic tank, the second-stage anaerobic tank and the third-stage aerobic tank.
5. The multi-stage a/O wastewater treatment system of claim 1, wherein: the bottom of the first-stage aerobic tank, the bottom of the second-stage aerobic tank and the bottom of the third-stage aerobic tank are provided with aerators, the aerators are connected with an air blower through pipelines, and the pipelines are provided with valves for adjusting aeration quantity or closing aeration.
6. The multi-stage a/O wastewater treatment system of claim 1, wherein: the three-level aerobic tank is provided with mixed liquid backflow and is connected to the one-level anaerobic tank, the one-level anoxic tank, the two-level aerobic tank and the two-level anaerobic tank through backflow pipelines, the mixed liquid backflow flows back through the backflow pump, and control valves are respectively arranged on the backflow pipelines.
7. The multi-stage a/O wastewater treatment system of claim 1, wherein: the sedimentation tank is a vertical flow sedimentation tank, and a frame type stirrer is arranged in the coagulation reaction tank for mechanical mixing.
8. The multi-stage a/O wastewater treatment system of claim 7, wherein: the filter tank has the same tank type, water distribution mode and water outlet mode as those of a vertical sedimentation tank, and a filter material is arranged in the middle of the tank to form a filter area and is filled with fiber bundles.
9. The multi-stage a/O wastewater treatment system of claim 1, wherein: the filter tank is back-flushed by the effluent of the sedimentation tank, and a back-flushing pump is arranged on the back-flushing pipeline.
10. The multi-stage a/O wastewater treatment system of claim 1, wherein: the anaerobic sewage treatment system is characterized in that a sludge discharge hopper and a sludge discharge pipe are arranged at the bottoms of the primary anaerobic tank, the primary anoxic tank and the secondary anaerobic tank and used for discharging dead sludge and inorganic sludge of the biochemical treatment system, and the sludge is discharged through the sludge discharge pipe in the primary aerobic tank and the secondary aerobic tank.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110642476A (en) * | 2019-10-30 | 2020-01-03 | 重庆郅治环保科技有限公司 | Multistage A/O sewage treatment system |
| CN112607862A (en) * | 2020-12-14 | 2021-04-06 | 重庆郅治环保科技有限公司 | Multistage AO sewage biochemical treatment process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110642476A (en) * | 2019-10-30 | 2020-01-03 | 重庆郅治环保科技有限公司 | Multistage A/O sewage treatment system |
| CN112607862A (en) * | 2020-12-14 | 2021-04-06 | 重庆郅治环保科技有限公司 | Multistage AO sewage biochemical treatment process |
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