CN217127210U - Emergency treatment system for urban sewage - Google Patents

Abstract

The utility model provides an emergency treatment system for municipal sewage, aims at overcoming among the prior art municipal sewage treatment process, and partial row's mouth cuts dirty equipment imperfection to and sewage factory treatment capacity is not enough to lead to the shortcoming of pollutant reentry river course, and this emergency treatment system for sewage includes: the system comprises a primary precipitation unit, an anoxic unit, an aerobic unit, a secondary precipitation unit and a disinfection unit which are sequentially communicated, and further comprises a sludge unit which is respectively communicated with the aerobic unit and the secondary precipitation unit; the aerobic unit comprises an aerobic tank, a group of sludge-water separators, a nitrifying liquid reflux pump and a residual sludge delivery pump, wherein the water inlets and the water outlets of the sludge-water separators are sequentially communicated, the water inlets of the sludge-water separators correspond to the sewage level in the aerobic tank, and the sludge outlets of the sludge-water separators correspond to the aerobic tank. The utility model is used for urban sewage emergency treatment, each unit can be installed fast and demolish, shorten sewage treatment system construction, demolish the time limit for a project, can be according to sewage type and pollution degree, nimble selection and the corresponding processing system of construction.

Description

Emergency treatment system for urban sewage

Technical Field

The utility model relates to a sewage treatment field especially relates to an emergency treatment system for municipal sewage.

Background

With the rapid development of economy in China, the problem of urban river pollution is increasingly prominent: the city river channel is 'black and smelly in water, the root is on the bank, the key is at the discharge port, and the core is in the pipe network'. Pollutants are discharged along various discharge openings and enter a river channel through overflow, and the conventional treatment mode is to cut off the pollutants at the discharge openings and then convey the pollutants to relevant treatment facilities through a pipe network for treatment.

However, in actual processing, the following situations may occur: (1) some discharge ports can not intercept sewage due to various reasons, and pollutants are directly discharged into a river channel; (2) the sewage interception multiple is small, and pollutants overflow into a river channel; (3) in the process of conveying sewage to a treatment facility through a pipe network, pollutants enter a river channel again due to the damage of the pipe network; (4) after sewage is conveyed to a sewage plant, the sewage plant has insufficient treatment capacity, and the expansion is not completed in time, so that pollutants enter a river channel again.

SUMMERY OF THE UTILITY MODEL

The utility model overcomes among the municipal sewage treatment process among the prior art, the partial blowdown is arranged mouthful and is cut dirty equipment imperfect to and the sewage factory throughput is not enough to lead to the shortcoming of pollutant reentrant river course, provide a municipal sewage emergency treatment system.

The utility model discloses the technical scheme who realizes that the purpose adopts is: an emergency municipal sewage treatment system comprising: the sedimentation unit, oxygen deficiency unit, good oxygen unit, disinfection unit and mud unit, the sedimentation unit include: a first-stage precipitation unit and a second-stage precipitation unit. The primary precipitation unit, the anoxic unit, the aerobic unit, the secondary precipitation unit and the disinfection unit are sequentially communicated. The sludge unit is respectively communicated with the aerobic unit and the secondary sedimentation unit.

The primary precipitation unit comprises: a first-stage sedimentation tank.

The hypoxia unit comprises: the device comprises an anoxic tank and a flow impeller, wherein the flow impeller is arranged in the anoxic tank, a water inlet of the anoxic tank is communicated with a water outlet of a primary sedimentation tank in a primary sedimentation unit, and an overflow port is arranged at the upper end of the anoxic tank.

The aerobic unit comprises: the aerobic tank, a group of sludge-water separators, a nitrifying liquid reflux pump and a residual sludge delivery pump are sequentially communicated with the water inlet and the water outlet respectively. The bottom of the aerobic tank is provided with a water inlet, and the water inlet of the aerobic tank is communicated with the water outlet of the anoxic tank in the anoxic unit. The mud-water separator is arranged above the aerobic tank, a water inlet of the mud-water separator corresponds to the sewage surface in the aerobic tank, and a sludge outlet of the mud-water separator corresponds to the aerobic tank. The nitrification liquid reflux pump and the residual sludge delivery pump are arranged at the bottom of the aerobic tank, and a sludge outlet of the nitrification liquid reflux pump is communicated with an anoxic tank pipeline in the anoxic unit; the sludge outlet of the residual sludge delivery pump is communicated with the sludge unit.

The secondary precipitation unit comprises: a secondary sedimentation tank and a doser. The medicine outlet of the doser is communicated with the secondary sedimentation tank. The water inlet of the secondary sedimentation tank is communicated with the water outlet of the mud-water separator of the aerobic unit, and the sludge outlet of the secondary sedimentation tank is communicated with the sludge unit.

The sterilization unit includes: disinfecting the water tank; one or the combination of any devices of an ultraviolet disinfection device, an ozone generation device or a chlorine dioxide feeding device is arranged in the disinfection water tank; the water inlet of the disinfection water tank is communicated with the water outlet of the secondary sedimentation tank in the secondary sedimentation unit.

Further, a first-stage sedimentation tank in the first-stage sedimentation unit is set as follows: a grit chamber or a primary settling chamber. The grit chamber is as follows: the sand settling tank comprises a sand-water separator arranged at the bottom of the sand settling tank, and a sand outlet of the sand settling tank is communicated with a sand inlet of the sand-water separator. The primary sedimentation tank comprises: any one of horizontal flow type, vertical flow type, radial flow type or inclined plate/pipe primary sedimentation tank.

Further, the aerobic unit further comprises: a group of serially connected aerators and a group of serially connected blowers, wherein the group of aerators is arranged at the bottom of the aerobic tank, and the air outlets of the aerators are communicated with the air inlet pipelines of the aerators.

Further, the secondary precipitation unit further comprises: an overflow plate. The overflow plate is fixedly arranged in the secondary sedimentation tank, and the secondary sedimentation tank is divided into a coagulating sedimentation area and an inclined tube sedimentation area by the overflow plate. A pair of vertically arranged stirrers is arranged in the coagulating sedimentation area, and the stirring speed of the stirring device positioned above is higher than that of the stirring device positioned below; the coagulating sedimentation area is communicated with a medicine outlet of the medicine feeder, and a water inlet of the coagulating sedimentation area is communicated with a water outlet of a mud-water separator in the aerobic unit. The inclined tube settling zone is internally provided with: a group of inclined pipes and mud scrapers; a group of inclined pipes are uniformly arranged below the sewage level in the inclined pipe settling zone; the mud scraper is arranged below the group of inclined pipes; the sludge outlet of the inclined tube settling zone is communicated with the sludge unit.

Furthermore, the bottom of the inclined tube settling zone in the secondary settling unit is communicated with a bottom pipeline of the coagulating sedimentation zone through a sludge reflux pump.

Further, the sludge unit comprises: a sludge concentration tank and a sludge dewatering room which are communicated through a pipeline. A sludge filter press is arranged in the sludge dewatering room, and a sludge inlet of the sludge filter press is communicated with the sludge concentration tank. The sludge concentration tank is respectively communicated with a conveying sludge pump in the aerobic unit and a sludge outlet pipeline of a secondary sedimentation tank in the secondary sedimentation unit.

Furthermore, a sludge conditioning device is arranged in the sludge dewatering room in the sludge unit, a sludge inlet of the sludge conditioning device is communicated with the sludge concentration tank, and a sludge outlet of the sludge conditioning device is communicated with a sludge inlet of the sludge filter press.

Further, the emergency treatment system for municipal sewage further comprises: a lifting unit; a group of lifting pumps are arranged in the lifting unit; the water outlets of the group of lift pumps are communicated with the water inlet of a primary sedimentation tank in the primary sedimentation unit.

Furthermore, the lifting unit is set as an integrated lifting pump station.

The utility model has the advantages that: (1) municipal sewage passes through the utility model discloses a processing system can reach surface water IV standard after handling, discharges into the river course nearby, realizes that river course quality of water is up to standard and moisturizing function.

(2) The treatment units of the utility model can be quickly installed and removed, thereby greatly shortening the construction period and the removal period of the sewage treatment system; and can be according to the type of municipal sewage and the pollution degree of sewage, the nimble processing system of selecting and setting up is fit for municipal sewage emergency treatment.

(3) The aerobic unit of the utility model comprises: the sewage enters from the bottom of the aerobic tank, the sludge-water separator is arranged above the aerobic tank and used for carrying out sludge-water separation on the sewage above the aerobic tank, part of the slurry enters the lower part of the aerobic tank and is continuously subjected to aerobic treatment, and the effluent of the sludge-water separator enters the secondary sedimentation unit for further treatment.

(4) The utility model discloses an in the oxygen deficiency pond that muddy water at the bottom of the good oxygen pond in the good oxygen unit enters into the oxygen deficiency unit through nitrifying liquid backwash pump, carry out the oxygen deficiency processing of mud once more, during the delivery port through the oxygen deficiency pond enters into good oxygen pond again behind the oxygen deficiency processing, continues to rise in good oxygen pond and carries out mud-water separation in entering into mud-water separator and handle, and mud part through mud-water separator enters into good oxygen pond lower part and carries out good oxygen processing for mud in the good oxygen pond has realized: aerobic treatment, anoxic treatment, sludge-water separation and cyclic treatment of aerobic treatment.

(5) The sludge-water separator is arranged in the aerobic tank, so that the occupied area is reduced; additionally, the utility model discloses an each unit adopts the modularization setting, can install in a flexible way, and area is little.

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Drawings

Fig. 1 is a schematic diagram of the system of the present invention.

Figure 2 is a schematic structural diagram of the aerobic unit of the present invention.

Figure 3 is the structure schematic diagram of the second grade precipitation unit of the utility model.

In the attached drawing, 1 is a primary precipitation unit, 1-1 is a primary precipitation tank, 2 is an anoxic unit, 2-1 is an anoxic tank, 2-2 is a flow impeller, 3 is an aerobic unit, 3-1 is an aerobic tank, 3-2 is a mud-water separator, 3-3 is a nitrifying liquid reflux pump, 3-4 is a residual sludge delivery pump, 3-5 is an aerator, 3-6 is an air blower, 4 is a secondary precipitation unit, 4-1 is a secondary precipitation tank, 4-2 is a chemical adding device, 4-3 is an overflow plate, 4-4 is a stirrer, 4-5 is an inclined pipe, 4-6 is a mud scraper, 5 is a disinfection unit, 5-1 is a disinfection water tank, 6 is a sludge unit, 6-1 is a sludge concentration tank, 6-2 is a sludge dewatering chamber, 7 is a lifting unit, 7-1 is a lifting pump tank, A1 is a coagulating sedimentation zone, and A2 is an inclined tube sedimentation zone.

Detailed Description

As shown in the attached drawings, the emergency treatment system for municipal sewage of the embodiment comprises: the system comprises a precipitation unit, an anoxic unit 2, an aerobic unit 3, a disinfection unit 5 and a sludge unit 6, wherein the standard of urban sewage discharged to a river channel needs to reach the standard of surface water, so that the precipitation unit, the anoxic unit, the aerobic unit and the disinfection unit need to be combined.

The precipitation unit comprises: a primary precipitation unit 1 and a secondary precipitation unit 4. The first-stage precipitation unit 1, the anoxic unit 2, the aerobic unit 3, the second-stage precipitation unit 4 and the disinfection unit 5 are sequentially communicated to jointly form the urban sewage emergency treatment system. The sludge unit 6 is respectively communicated with the aerobic unit 3 and the secondary sedimentation unit 4, and the sludge unit 6 is used for carrying out centralized treatment on sludge in the system.

The primary precipitation unit 1 comprises: a first-stage sedimentation tank 1-1. The primary sedimentation tank 1-1 is used for separating easily-settled silt or other solid suspended matters in sewage from the sewage in advance, a water inlet of the primary sedimentation tank 1-1 is communicated with a municipal sewage discharge outlet, and a grating is generally arranged on the primary sedimentation tank 1-1 and used for intercepting suspended matters or floating matters in the sewage.

The first-stage sedimentation tank 1-1 in the first-stage sedimentation unit 1 is preferably set as follows: a grit chamber or a sedimentation tank. In practical application, the first-stage precipitation unit 1 can be set as a grit chamber or a primary sedimentation tank according to practical conditions: (1) if the sewage is confluence system sewage or initial rainwater under the reposition of redundant personnel system, should establish one-level precipitation unit 1 to the grit chamber and remove the great inorganic particulate matter of density in the sewage, like silt etc. the grit chamber can adopt: the sand-water separator is arranged at the bottom of the grit chamber, and a sand outlet of the grit chamber is communicated with a sand inlet of the sand-water separator. (2) If sewage is domestic sewage or industrial wastewater under the reposition of redundant personnel system, should set up one-level precipitation unit 1 to the primary sedimentation tank and get rid of the great suspended solid of density in the sewage, the primary sedimentation tank can adopt: any one of horizontal flow type, vertical flow type, radial flow type or inclined plate/pipe primary sedimentation tank.

If the sewage that needs to handle can't flow by oneself, need promote to follow-up processing system through the elevator pump pond, consequently, the urban sewage emergency treatment system that this embodiment is preferred still includes: a lifting unit 7; a group of lifting pumps 7-1 is arranged in the lifting unit 7; the water outlets of the group of lift pumps 7-1 are communicated with the water inlet of a primary sedimentation tank 1-1 in the primary sedimentation unit 1; the water inlet of the lifting unit 7 is communicated with the discharge port of the municipal sewage. Arranging a lifting unit 7 in front of a primary sedimentation unit 1, arranging a coarse grid on a water inlet of the lifting unit 1, and intercepting larger suspended matters or floaters so as to protect equipment in the lifting unit 7; the water inlet of the first-level precipitation unit 1 is provided with a fine grid for further intercepting suspended matters, floating matters and the like, thereby facilitating the subsequent treatment of sewage. The preferred lifting unit 7 of this embodiment is designed as an integrated lifting pump station, which facilitates quick installation and removal.

The anoxic unit 2 comprises: the device comprises an anoxic tank 2-1 and a flow impeller 2-2, wherein the flow impeller 2-2 is arranged in the anoxic tank 2-1, a water inlet of the anoxic tank 2-1 is communicated with a water outlet of a primary sedimentation tank 1-1 in a primary sedimentation unit 1, and an overflow port is arranged at the upper end of the anoxic tank 2-1. The anoxic tank 2-1 is a conventional anoxic tank, and the flow impeller 2-2 in the anoxic tank 2-1 can prevent the activated sludge in the anoxic unit 2 from depositing, so that the activated sludge is fully contacted with the sewage.

Suspended matters and organic matters in the sewage are properly decomposed in the anoxic unit 2, so that the pressure of subsequent aerobic treatment can be reduced, the volume of the tank body is further reduced, and the investment is saved. The anoxic unit 2 has a certain buffer effect on the change of the water inlet load, has stronger impact load resistance capacity, and creates more stable water inlet conditions for aerobic treatment.

The aerobic unit 3 comprises: the aerobic tank 3-1, a group of sludge-water separators 3-2 with water inlets and water outlets respectively communicated with the aerobic tank, a nitrifying liquid reflux pump 3-3 and a residual sludge delivery pump 3-4 in sequence. The bottom of the aerobic tank (3-1) is provided with a water inlet, and the water inlet of the aerobic tank (3-1) is communicated with the water outlet of the anoxic tank (2-1) in the anoxic unit (2);

the mud-water separator 3-2 is arranged above the aerobic tank 3-1, the water inlet of the mud-water separator 3-2 corresponds to the sewage surface in the aerobic tank (3-1), and the sludge outlet of the mud-water separator 3-2 corresponds to the aerobic tank. The nitrifying liquid reflux pump 3-3 and the residual sludge delivery pump 3-4 are arranged at the bottom of the aerobic tank 3-1, and the sludge outlet of the nitrifying liquid reflux pump 3-3 is communicated with the pipeline of the anoxic tank 2-1 in the anoxic unit 2; the sludge outlets of the residual sludge conveying devices 3-4 are communicated with a sludge unit 6.

In order to ensure the treatment of the sewage in the aerobic unit 3, the aerobic unit 3 further comprises: a group of serially connected aerators 3-5 and a group of serially connected blowers 3-6, wherein the group of aerators 3-5 is arranged at the bottom of the aerobic tank 3-1, and the air outlets of the aerators 3-6 are communicated with the air inlet pipelines of the aerators 3-5.

The sludge-water separator 3-2 arranged in the aerobic unit 3 can improve the dissolved oxygen efficiency of the aerobic tank 3-1, realize unpowered automatic backflow of sludge and effectively intercept microorganisms with longer generation period. The mud-water separator 3-2 is arranged above the aerobic tank 3-1, so that the mud-water separator 3-2 can effectively prevent gas rising right below from entering the device, and the gas-cement three-phase separation effect is effectively improved.

In the aerobic unit 3, sewage rises, enters a mud-water separator 3-2, and is treated by a group of mud-water separators 3-2 to obtain a slurry part and a water outlet part: (1) the effluent part enters the next unit for treatment through a pipeline; (2) part of the slurry enters an aerobic tank 3-1 for further aerobic treatment, and part of the slurry after the aerobic treatment flows back to an anoxic tank 2-1 through a nitrifying liquid reflux pump 3-3 for anoxic reaction, then enters the aerobic tank 3-1 together with sewage in the anoxic tank 2-1, rises in the aerobic tank 3-1, and enters a mud-water separator 3-2 for mud-water separation; and the other part of the sludge after the aerobic treatment enters a sludge unit 6 for treatment through a residual sludge transfer pump 3-4.

In the actual equipment construction, the anoxic unit 2 and the aerobic unit 3 can be jointly constructed, so that the manufacturing cost is saved. And the tank bodies of the anoxic tank 2-1 and the aerobic tank 3-1 can be constructed into reinforced concrete structures or steel structures as required, and the mud-water separator 3-2 is steel structure equipment, so that the rapid installation and removal can be realized.

The secondary precipitation unit 4 comprises: a secondary sedimentation tank 4-1 and a doser 4-2. The medicine outlet of the medicine adding device 4-2 is communicated with the secondary sedimentation tank 4-1. The water inlet of the secondary sedimentation tank 4-1 is communicated with the water outlet of the mud-water separator 3-2 of the aerobic unit 3, and the sludge outlet of the secondary sedimentation tank 4-1 is communicated with the sludge unit 6. The secondary sedimentation tank carries out advanced treatment on the effluent of the mud-water separator 3-2, and coagulant and flocculant, generally PAC and PAM, are added into the sewage in the secondary sedimentation tank 4-1 through a doser 4-2.

The preferred secondary precipitation unit 4 further comprises: overflow plates 4-3. The overflow plate 4-3 is fixedly arranged in the secondary sedimentation tank 4-1, and the overflow plate 4-3 divides the secondary sedimentation tank 4-1 into a coagulating sedimentation area A1 and an inclined tube sedimentation area A2.

The coagulating sedimentation area A1 is used for dosing and sedimentation of sewage, a pair of vertically arranged stirrers 4-4 are arranged in the coagulating sedimentation area A1, and the stirring speed of the stirring device positioned above is greater than that of the stirring device positioned below; the coagulating sedimentation area A1 is communicated with a medicine outlet of the medicine feeder 4-2, and a water inlet of the coagulating sedimentation area A1 is communicated with a water outlet of the mud-water separator 3-2 in the aerobic unit 3.

The inclined tube settling zone A2 is used for further settling the effluent obtained from the coagulating sedimentation zone A1, and the inclined tube settling zone A2 is internally provided with: a group of inclined pipes 4-5 and a mud scraper 4-6; a group of inclined pipes 4-5 are uniformly arranged below the sewage level of the inclined pipe settling zone A2; the mud scraper 4-6 is arranged below the group of inclined pipes 4-5; the sludge outlet of the inclined tube sedimentation area A2 is communicated with the sludge unit 6.

In order to further ensure the advanced treatment of the sewage in the secondary sedimentation unit 4, the bottom of the inclined tube sedimentation area a2 in the secondary sedimentation unit 4 is preferably communicated with the bottom pipeline of the coagulating sedimentation area a1 through a sludge return pump, the muddy water at the bottom of the inclined tube sedimentation area a2 is returned to the coagulating sedimentation area for further sedimentation, and then the muddy water is subjected to sedimentation treatment through the inclined tube sedimentation area a 2.

In order to obtain clean effluent, the municipal sewage emergency treatment system further comprises: a sterilizing unit 5. The disinfection unit 5 is internally provided with: 5-1 of a disinfection water tank; one or the combination of any more of an ultraviolet disinfection device, an ozone generation device or a chlorine dioxide adding device is arranged in the disinfection water tank 5-1; the water inlet of the disinfection water tank 5-1 is communicated with the water outlet of the secondary sedimentation tank 4-1 in the secondary sedimentation unit 4. The effluent obtained after the sterilization and disinfection of the disinfection unit 5 is effluent which can be discharged after reaching the standard. Generally, an ultraviolet disinfection technology with rapid sterilization and no chemical agent is selected, and after the sewage is disinfected, a metering facility can be installed as required to record the treated water amount.

In the sewage treatment system of the utility model, the sludge in the aerobic unit 3 and the secondary sedimentation unit 4 finally enters the sludge unit 6 for treatment. For efficient treatment of the sludge, the preferred sludge unit 6 comprises: the sludge concentration tank 6-1 and the sludge dewatering room 6-2 are communicated through a pipeline, a sludge filter press is arranged in the sludge dewatering room 6-2, and a sludge inlet of the sludge filter press is communicated with the sludge concentration tank 6-1. The sludge concentration tank 6-1 is respectively communicated with a sludge outlet pipeline of a conveying sludge pump 3-4 in the aerobic unit 3 and a sludge outlet pipeline of a secondary sedimentation tank 4-1 in the secondary sedimentation unit 4.

For further treatment of sludge, in the preferred sludge dewatering room 6-2 of the sludge unit 6 of this embodiment, a sludge conditioning device is further disposed, a sludge inlet of the sludge conditioning device is communicated with the sludge concentration tank 6-1, and a sludge outlet of the sludge conditioning device is communicated with a sludge inlet of the sludge filter press.

The emergency treatment of sewage is an effective means for reducing pollution and risk: not only solves the problem of overflow of the discharge port or the pipe network; the sewage is directly treated, so that the running load and pressure of a pipe network, a pump station and a terminal sewage treatment plant are greatly reduced; and the pollution of sewage to peripheral river channels is reduced.

The standard of urban sewage discharged into a river channel needs to reach the standard of surface water, and primary treatment, secondary treatment and advanced treatment need to be combined. The main task of primary treatment is to remove the solid contaminant that is suspension or floating state in the sewage, the utility model provides a hoisting unit 7 and one-level precipitation unit 1 are primary treatment. The main task of secondary treatment is to remove the organic pollutants in the sewage in colloid and dissolved state and the soluble inorganic pollutants such as nitrogen and phosphorus which can make the water eutrophication, the utility model provides an oxygen deficiency unit 2 and aerobic unit 3 are secondary treatment. The main task of the advanced treatment is to further remove the organic matters which can not be degraded and the inorganic matters which can cause the eutrophication of the water body, and the secondary sedimentation unit 4 and the disinfection unit 5 of the utility model carry out the advanced treatment on the sewage.

In the emergency treatment of urban sewage, if the three-stage treatment facilities are all constructed by adopting a conventional reinforced concrete pool, the occupied area is large, and the construction period is long; and after the capacity expansion of the terminal sewage plant is completed, the structure is difficult to dismantle, and the better cyclic utilization cannot be realized. Therefore, the technical scheme flexibly selects the processing units to be combined on the premise of high effluent standard, uses modularized or equipment facilities as much as possible in the construction, and is convenient for quick installation in the early stage and quick removal in the later stage and can be reused in the conditional period.

Utilize the utility model discloses a sewage treatment system when carrying out sewage treatment mainly includes following processing step:

a. when the sewage can not flow automatically, the sewage firstly enters the lifting unit through the intercepting pipe and then enters the treatment system through the lifting pump;

b. b, allowing the water treated in the step a to enter a primary precipitation unit through a pipeline for sand setting or primary precipitation treatment;

c. b, the water treated in the step b enters an anoxic unit, and partial organic matters are consumed in the anoxic unit and subjected to denitrification;

d. c, the water treated in the step c enters an aerobic unit for aerobic treatment, the ascending sewage enters a sludge-water separator for sludge-water separation, and the settled sludge-water is further treated aerobically;

e. d, enabling the effluent water subjected to mud-water separation in the step d to enter a secondary precipitation unit for dephosphorization and SS removal, and clarifying the effluent water;

f. and e, the clarified effluent water enters a disinfection unit, and the unit is sterilized, so that the effluent water reaches the standard and is discharged.

Claims (9)

1. An emergency municipal sewage treatment system comprising: a sedimentation unit, an anoxic unit, an aerobic unit, a disinfection unit and a sludge unit, which is characterized in that,

the precipitation unit comprises: a primary precipitation unit (1) and a secondary precipitation unit (4);

the primary precipitation unit (1), the anoxic unit (2), the aerobic unit (3), the secondary precipitation unit (4) and the disinfection unit (5) are sequentially communicated;

the sludge unit (6) is respectively communicated with the aerobic unit (3) and the secondary sedimentation unit (4);

the primary precipitation unit (1) comprises: a first-stage sedimentation tank (1-1);

the anoxic unit (2) comprises: the device comprises an anoxic tank (2-1) and a flow impeller (2-2), wherein the flow impeller (2-2) is arranged in the anoxic tank (2-1), a water inlet of the anoxic tank (2-1) is communicated with a water outlet of a primary sedimentation tank (1-1) in a primary sedimentation unit (1), and an overflow port is arranged at the upper end of the anoxic tank (2-1);

the aerobic unit (3) comprises: the aerobic tank (3-1), a group of sludge-water separators (3-2) with water inlets and water outlets respectively communicated with one another in sequence, a nitrifying liquid reflux pump (3-3) and a residual sludge delivery pump (3-4);

the bottom of the aerobic tank (3-1) is provided with a water inlet, and the water inlet of the aerobic tank (3-1) is communicated with the water outlet of the anoxic tank (2-1) in the anoxic unit (2);

the mud-water separator (3-2) is arranged above the aerobic tank (3-1), the water inlet of the mud-water separator (3-2) corresponds to the sewage surface in the aerobic tank (3-1), and the sludge outlet of the mud-water separator (3-2) corresponds to the aerobic tank (3-1);

the nitrifying liquid reflux pump (3-3) and the residual sludge delivery pump (3-4) are arranged at the bottom of the aerobic tank (3-1), and a sludge outlet of the nitrifying liquid reflux pump (3-3) is communicated with a pipeline of the anoxic tank (2-1) in the anoxic unit (2); the sludge outlet of the residual sludge delivery pump (3-4) is communicated with the sludge unit (6);

the secondary precipitation unit (4) comprises: a secondary sedimentation tank (4-1) and a doser (4-2);

the medicine outlet of the medicine adding device (4-2) is communicated with the secondary sedimentation tank (4-1);

the water inlet of the secondary sedimentation tank (4-1) is communicated with the water outlet of the mud-water separator (3-2) of the aerobic unit (3), and the sludge outlet of the secondary sedimentation tank (4-1) is communicated with the sludge unit (6);

the sterilisation unit (5) comprising: a disinfection water tank (5-1); one or the combination of any of an ultraviolet disinfection device, an ozone generation device or a chlorine dioxide feeding device is arranged in the disinfection water tank (5-1); the water inlet of the disinfection water tank (5-1) is communicated with the water outlet of the secondary sedimentation tank (4-1) in the secondary sedimentation unit (4).

2. The emergency municipal sewage treatment system according to claim 1, wherein the primary settling tank (1-1) of said primary settling unit (1) is configured as: a grit chamber or primary settling chamber;

the grit chamber is as follows: the sand-water separator is arranged at the bottom of the grit chamber, and a sand outlet of the grit chamber is communicated with a sand inlet of the sand-water separator;

the primary sedimentation tank comprises: any one of horizontal flow type, vertical flow type, radial flow type or inclined plate/pipe primary sedimentation tank.

3. The municipal sewage emergency treatment system according to claim 1, wherein the aerobic unit (3) further comprises: a group of serially connected aerators (3-5) and a group of serially connected blowers (3-6), wherein the group of aerators (3-5) is arranged at the bottom of the aerobic tank (3-1), and the air outlets of the aerators (3-6) are communicated with the air inlet pipelines of the aerators (3-5).

4. The municipal sewage emergency treatment system according to claim 1, wherein said secondary sedimentation unit (4) further comprises: an overflow plate (4-3);

the overflow plate (4-3) is fixedly arranged in the secondary sedimentation tank (4-1), and the overflow plate (4-3) divides the secondary sedimentation tank (4-1) into a coagulating sedimentation area (A1) and an inclined tube sedimentation area (A2);

a pair of up-and-down stirrers (4-4) is arranged in the coagulating sedimentation zone (A1); the coagulating sedimentation area (A1) is communicated with the medicine outlet of the medicine feeder (4-2), and the water inlet of the coagulating sedimentation area (A1) is communicated with the water outlet of the mud-water separator (3-2) in the aerobic unit (3);

the inclined tube settling zone (A2) is internally provided with: a group of inclined pipes (4-5) and mud scrapers (4-6); a group of inclined pipes (4-5) are uniformly arranged below the sewage level of the inclined pipe settling zone (A2); the mud scraper (4-6) is arranged below the group of inclined pipes (4-5); the sludge outlet of the inclined tube settling zone (A2) is communicated with the sludge unit (6).

5. The municipal sewage emergency treatment system according to claim 4, wherein the bottom of the inclined tube sedimentation zone (A2) in the secondary sedimentation unit (4) is connected to the bottom pipe of the coagulation sedimentation zone (A1) by a slurry pump.

6. The emergency municipal sewage treatment system according to claim 1, wherein said sludge unit (6) comprises: a sludge concentration tank (6-1) and a sludge dewatering room (6-2) which are communicated through a pipeline;

a sludge filter press is arranged in the sludge dewatering room (6-2), and a sludge inlet of the sludge filter press is communicated with the sludge concentration tank (6-1);

the sludge concentration tank (6-1) is respectively communicated with the residual sludge delivery pump (3-4) in the aerobic unit (3) and the sludge outlet pipeline of the secondary sedimentation tank (4-1) in the secondary sedimentation unit (4).

7. The emergency municipal sewage treatment system according to claim 6, wherein a sludge conditioning device is further disposed in the sludge dewatering room (6-2) of the sludge unit (6), the sludge inlet of the sludge conditioning device is connected to the sludge concentration tank (6-1), and the sludge outlet of the sludge conditioning device is connected to the sludge inlet of the sludge filter press.

8. The municipal sewage emergency treatment system according to claim 1, further comprising: a lifting unit (7); a group of lifting pumps (7-1) are arranged in the lifting unit (7); the water outlets of the group of lift pumps (7-1) are communicated with the water inlet of the primary sedimentation tank (1-1) in the primary sedimentation unit (1).

9. The municipal sewage emergency treatment system according to claim 8, wherein the lifting unit (7) is configured as an integrated lifting pump station.

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