CN211595371U - Domestic sewage treatment device - Google Patents
Domestic sewage treatment device Download PDFInfo
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- CN211595371U CN211595371U CN201922489143.4U CN201922489143U CN211595371U CN 211595371 U CN211595371 U CN 211595371U CN 201922489143 U CN201922489143 U CN 201922489143U CN 211595371 U CN211595371 U CN 211595371U
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Abstract
The utility model discloses a domestic sewage treatment device belongs to sewage treatment technical field. The utility model discloses a continuous aeration grit chamber in proper order, the anaerobism pond, the oxygen deficiency pond, good oxygen pond, two sink ponds and reaction sedimentation tank, two sink ponds are equipped with the mud back flow that links to each other with anaerobism pond and oxygen deficiency pond, the mud back flow includes the branch pipe that is connected with the anaerobism pond and the branch pipe that is connected with the oxygen deficiency pond, be equipped with the first solenoid valve of adjusting the aperture on the first branch pipe, be equipped with the second solenoid valve of adjusting the aperture on the second branch pipe, aeration grit chamber includes circular cell body, a water inlet, the delivery port, aeration pipe and the collection husky groove of setting in circular cell body bottom, aeration pipe quantity is more than one and uses circular cell body centre of a circle to become ring shape and distribute as the center, the water inlet uses the tangential direction to set up at circular cell body lateral wall, the delivery port setting. The utility model discloses it is more thorough, the treatment methods are various, mud outward transport is convenient to sink the sand, satisfies the sewage treatment requirement.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, concretely relates to domestic sewage treatment device.
Background
Domestic sewage is common in sewage treatment, the components of the domestic sewage are complex, the domestic sewage often contains multiple organic pollutants and suspended particles, the water quality fluctuation is large, the sewage discharge amount is large, and the treatment problem is concerned at home and abroad; A2O method is also called AAO method (anaerobic-anoxic-aerobic method), is a commonly used sewage treatment process, can be used for secondary sewage treatment or tertiary sewage treatment, and reclaimed water reuse, and has good denitrification and dephosphorization effects; the existing A2O method sewage treatment process also has the problems that the suspended particles in the sewage are more during the treatment of the front-end grit chamber, the subsequent treatment is more difficult, the sludge treatment after the treatment is inconvenient, and the like.
Disclosure of Invention
The purpose of the invention is as follows: the utility model aims to solve the technical problems that the domestic sewage treatment device is used for solving the technical problems that the settled sand is not thorough, the sewage treatment mode is single, the sludge treatment at the rear end of the process is inconvenient and the like in the sewage treatment process.
The technical scheme is as follows: in order to achieve the above purpose, the technical solution adopted by the present invention is as follows: a domestic sewage treatment device, which comprises an aeration grit chamber, an anaerobic chamber, an anoxic chamber, an aerobic chamber, a secondary sedimentation chamber and a reaction sedimentation chamber which are connected in sequence, the secondary sedimentation tank is provided with a sludge return pipe connected with the anaerobic tank and the anoxic tank, the sludge return pipe comprises a first branch pipe connected with the anaerobic tank and a second branch pipe connected with the anoxic tank, a first electromagnetic valve for adjusting the opening degree is arranged on the first branch pipe, a second electromagnetic valve for adjusting the opening degree is arranged on the second branch pipe, the aeration grit chamber comprises a circular tank body, a water inlet, a water outlet, an aeration pipe and a sand collecting tank arranged at the bottom of the circular tank body, the aeration pipe quantity is more than one and uses circular cell body centre of a circle to become the ring shape and distribute as the center, the water inlet uses tangential direction to set up at circular cell body lateral wall, the delivery port sets up at circular cell body lateral wall and direction perpendicular to water inlet direction.
Furthermore, the number of the aeration grit chambers is more than one, and the circular tank body water inlet of the next aeration grit chamber is connected with the circular tank body water outlet of the previous aeration grit chamber.
Further, the secondary sedimentation tank is also connected with a sludge treatment device, and the sludge treatment device comprises a sludge storage tank and a sludge dewatering machine which are connected with the secondary sedimentation tank.
Furthermore, a clear liquid return pipe connected with the aeration grit chamber is arranged on the upper layer of the sludge storage tank, and a filtrate return pipe connected with the aeration grit chamber is arranged at the outlet of the sludge dewatering machine.
Furthermore, the anoxic tank is provided with a mixed liquid return pipe connected with the anaerobic tank.
Furthermore, the aerobic tank is provided with a nitrifying liquid return pipe connected with the anoxic tank.
Furthermore, the front end of the aeration grit chamber is also provided with a grating device, and the grating device is detachably provided with a filter screen.
Further, an ultraviolet disinfection lamp is arranged at the outlet of the reaction sedimentation tank.
Further, the secondary sedimentation tank is a radial flow sedimentation tank.
The treatment method adopting the domestic sewage treatment device comprises the following steps:
(a) the domestic sewage is lifted to an aeration grit chamber from a position to be treated by a water pump, a grid device in front of the aeration grit chamber filters large sundries, and a filter screen is detachably arranged for filtering medium sundries so as to carry out coarse filtration;
(b) the domestic sewage after coarse filtration enters the circular tank body from the water inlet of the aeration grit chamber, suspension sand is centrifugally separated in the circular tank body, air is input into the aeration pipe for aeration, and the suspension sand sinks and accumulates to the sand collecting tank under the action of rotational flow centrifugal force and the action of shearing force of aeration;
(c) domestic sewage flowing out of the aeration grit chamber sequentially enters an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank to be treated by the A2O method; the sludge in the secondary sedimentation tank flows back to the anaerobic tank and the anoxic tank through a sludge return pipe in proportion, the proportion is controlled by the opening degree of a first electromagnetic valve and a second electromagnetic valve, the mixed liquid in the anoxic tank flows back to the anaerobic tank through a mixed liquid return pipe, the return proportion is actually selected according to the prior art and is generally 50-100%, the nitrified liquid in the aerobic tank flows back to the anoxic tank through a nitrified liquid return pipe, and the return ratio is 100-300%;
(d) the effluent of the secondary sedimentation tank enters a reaction sedimentation tank, and is discharged after being irradiated by an ultraviolet disinfection lamp for a period of time;
(e) and (3) discharging the residual sludge in the secondary sedimentation tank (5) into a sludge storage tank, returning supernatant in the sludge storage tank to the aeration grit chamber through a clear liquid return pipe, discharging sludge in the sludge storage tank into a sludge dewatering machine for dewatering, returning the treated filtrate to the aeration grit chamber through a filtrate return pipe, and transporting the treated sludge to form a solid mud cake.
Has the advantages that: compared with the prior art, the utility model has the advantages of it is following: 1. the sewage and sand sedimentation treatment by the optimized aeration grit chamber structure is more thorough, and the subsequent treatment work is convenient; 2. the selectable sludge backflow design enables the treatment mode to be more diversified and meets the requirement of domestic sewage treatment; 3. the sludge at the rear end can form solid to be transported outside, and the treatment is convenient.
Drawings
FIG. 1 is a schematic view of a domestic sewage treatment apparatus;
FIG. 2 is a schematic structural view of an aeration grit chamber of a domestic sewage treatment device;
FIG. 3 is a schematic top view of the aerated grit chamber;
FIG. 4 is a schematic view of a domestic sewage treatment process.
Detailed Description
The present invention will be further clarified by the following embodiments, which are implemented on the premise of the technical solution of the present invention, and it should be understood that these embodiments are only used for explaining the present invention and are not used for limiting the scope of the present invention.
As shown in figure 1, the domestic sewage treatment device comprises a grid device 8, an aeration grit chamber 1, an anaerobic tank 2, an anoxic tank 3, an aerobic tank 4, a secondary sedimentation tank 5 and a reaction sedimentation tank 6 which are connected in sequence, wherein the secondary sedimentation tank 5 is provided with a sludge return pipe 51 connected with the anaerobic tank 2 and the anoxic tank 3, the sludge return pipe 51 comprises a branch pipe 511 connected with the anaerobic tank 2 and a branch pipe 512 connected with the anoxic tank 3, the branch pipe 511 is provided with an electromagnetic valve 52 for adjusting the opening degree, the branch pipe 512 is provided with an electromagnetic valve 53 for adjusting the opening degree, the proportion of sludge in the secondary sedimentation tank 5 which returns to the anaerobic tank 2 and the anoxic tank 3 can be adjusted by adjusting the opening degree of the electromagnetic valve 52 and the electromagnetic valve 53, the internal reflux of the common A2O process is large, a large amount of nitrate is brought into the anaerobic tank 2, when a large amount of nitrate exists in an anaerobic section, denitrifying bacteria can perform denitrification by using organic matters as carbon sources, therefore, the effective volume of the anaerobic section for anaerobic release of phosphorus is greatly reduced, the phosphorus removal effect is poor, and the sludge can enter the anaerobic tank 2 or the anoxic tank 3 in proportion by arranging the sludge return pipe 51 and the two electromagnetic valves between the secondary sedimentation tank 2 and the anaerobic tank 2 and between the secondary sedimentation tank 3 and the anoxic tank 2.
The domestic sewage has complex components, the phosphorus content can change in a crest mode, the branch pipe 511, the electromagnetic valve 52, the branch pipe 512 and the electromagnetic valve 53 can automatically adjust the sludge backflow position and the ratio of the sludge backflow position to the anaerobic tank 2 and the anoxic tank 3 according to the phosphorus content of the domestic sewage to be treated, and the two electromagnetic valves can be controlled in a sewage treatment control room through connecting wires; when the phosphorus content of the domestic sewage is higher, the second electromagnetic valve 53 is opened to a proper opening, and the sludge part of the secondary sedimentation tank 2 returns to the anoxic tank 3, so that the phenomenon that the excessive nitrate nitrogen enters the anaerobic tank 2 to destroy the anaerobic state of the anaerobic tank 2 and influence the phosphorus removal of the system can be prevented; meanwhile, a mixed liquid return pipe 31 from the anoxic tank 3 to the anaerobic tank 2 can be added, the mixed liquid in the anoxic tank 3 returns to the anaerobic tank 2, the nitrate concentration is greatly reduced due to denitrification in the anoxic tank, the anaerobic state of the anaerobic tank cannot be damaged by the return of the mixed liquid in the anoxic tank, and the phosphorus removal effect of the whole device is good; when the phosphorus content of the domestic sewage is lower, the second electromagnetic valve 53 is closed, the sludge in the secondary sedimentation tank 5 is returned to the anaerobic tank 2 for normal treatment according to the original process method, and the normally treated sewage can meet the requirements due to the lower phosphorus content in the sewage; the sludge reflux ratio needs to be controlled when a good phosphorus removal effect is kept and nitrogen removal is considered, the sludge reflux ratio can be effectively controlled by setting two electromagnetic valves through the opening degree, and the reflux ratio is reasonably selected according to the actual condition of sewage.
The secondary sedimentation tank 5 is also connected with a sludge treatment device 7, the sludge treatment device 7 comprises a sludge storage tank 71 and a sludge dewatering machine 72 which are connected with the secondary sedimentation tank 5, a clear liquid return pipe 711 which is connected with the aeration grit chamber 1 is arranged on the upper layer of the sludge storage tank 71, the clear liquid on the upper layer of the sludge storage tank 71 can flow back into the aeration grit chamber 1 for circular treatment, a filtrate return pipe 721 which is connected with the aeration grit chamber 1 is arranged at the outlet of the sludge dewatering machine 72, the filtrate flows back into the aeration grit chamber 1 for circular treatment in the desliming process, the sludge dewatering machine 72 can be a common belt filter press, and the sludge is compressed and then becomes a mud cake which is convenient for outward transportation;
the aerobic tank 4 is provided with a nitrifying liquid return pipe 42 connected with the anoxic tank 3, the nitrate nitrogen generated in the aerobic tank 4 can be returned to the anoxic tank 3 through a water pump to complete the denitrification process, and the return ratio can be selected according to a sewage source and is generally 100-300%;
an ultraviolet disinfection lamp 61 is also arranged at the outlet of the reaction sedimentation tank 6, and the sewage to be discharged is disinfected by ultraviolet rays;
the domestic sewage flowing from the aeration grit chamber 1 to the post treatment to the discharge midway of the reaction sedimentation tank 6 of the whole sewage treatment device can be transported by a water pump, and can also be carried out by utilizing the gravity of water by adopting a method of designing each treatment tank from high to low.
The secondary sedimentation tank 5 can be a common radial flow sedimentation tank, domestic sewage enters the tank from a central water inlet pipe of the tank and slowly flows to the periphery of the tank along the radius direction. The suspended matters are settled in the flow and enter a sludge hopper along the gradient of the bottom of the tank, and the clarified water overflows from the periphery of the tank and flows out of a water channel. The radial sedimentation tank mostly adopts a rotary mud scraper to collect sludge, and a scraper plate of the mud scraper scrapes the sludge sinking to the bottom of the tank to a sludge hopper at the center of the tank and then discharges the sludge by gravity or a sludge pump.
As shown in fig. 2 and fig. 3, the aeration grit chamber 1 includes a circular chamber 11, a water inlet 12, a water outlet 13, aeration pipes 14 and a sand collecting tank 15 disposed at the bottom of the circular chamber 11, the bottom of the circular chamber 11 is designed as a sand hopper with a certain inclination angle, which is beneficial for sand particles to enter the sand collecting tank 15, the aeration pipes 14 are 8 and are circularly distributed around the center of the circular chamber 11, the water inlet 12 and the water outlet are disposed on the side wall of the circular chamber 11, the water inlet 12 is disposed on the side wall of the circular chamber 11 in a tangential direction, the direction of the water outlet is perpendicular to the direction of the water inlet 12, domestic sewage enters the circular chamber 11 from the water inlet 12 and then continuously rotates along the wall of the circular chamber under the action of water flow, a large centrifugal force is generated during the rotation process, the circularly disposed aeration pipes have a strong shearing force on sand particles in the domestic sewage, organic, the device is favorable for obtaining relatively pure sand grains, the sand grains are thrown to the outside and sink into the sand collecting groove 15 at the bottom, the design of the circular aeration grit chamber ensures that no dead angle exists in the tank, the design of the tangential direction of the water inlet is more favorable for forming larger centrifugal force, and the sewage sand grains are treated more thoroughly; the aeration grit chamber 1 can also be designed in a plurality of series connection, the water outlet of the first aeration grit chamber is connected with the water inlet of the second aeration grit chamber, and the plurality of series connection designs are favorable for more thorough sand settling;
the front end of the aeration grit chamber 1 is also provided with a grid device 8, the grid device can be formed by grid bars with patterns, the distance of the grid bars is designed according to the type of the treated domestic sewage, the impurities of a large part are filtered, the grid device 8 can be detachably provided with a filter screen 81, the filter screen 81 is inserted into the grid device 8 in the form of an inserted plate, the filter screen can filter the medium impurities, and the filter screen 81 can be drawn out for replacement after being full of the impurities.
As shown in fig. 4, the process flow of domestic sewage treatment comprises the following steps:
(a) the domestic sewage is lifted to the aeration grit chamber 1 from a position to be treated by a water pump, a grid device 8 in front of the aeration grit chamber 1 filters large sundries, and a filter screen 81 is detachably arranged to filter medium sundries so as to carry out coarse filtration;
(b) domestic sewage after coarse filtration enters the circular tank body 11 from a water inlet (12) of the aeration grit chamber 1, suspended sand particles are centrifugally separated in the circular tank body 11, air is input into an aeration pipe for aeration, and the suspended sand particles sink and are accumulated to the sand collecting tank 15 under the action of rotational flow centrifugal force and the action of shearing force of aeration;
(c) domestic sewage flowing out of the aeration grit chamber 1 sequentially enters an anaerobic tank 2, an anoxic tank 3, an aerobic tank 4 and a secondary sedimentation tank 5 to be treated by the A2O method; part of sludge in the secondary sedimentation tank 5 flows back to the anaerobic tank 2 and the anoxic tank 3 through a sludge return pipe 51 in proportion, the proportion is controlled through the opening degrees of a first electromagnetic valve 52 and a second electromagnetic valve 53, the mixed liquid in the anoxic tank 3 flows back to the anaerobic tank 2 through a mixed liquid return pipe 31, the return ratio is actually selected according to the prior art and is generally 50-100%, and part of nitrified liquid in the aerobic tank 4 flows back to the anoxic tank 3 through a nitrified liquid return pipe 42, and the return ratio is 100-300%;
(d) the effluent of the secondary sedimentation tank 5 enters a reaction sedimentation tank 6 and is discharged after being irradiated by an ultraviolet disinfection lamp 61 for a period of time;
(e) the residual sludge in the secondary sedimentation tank 5 is discharged into a sludge storage tank 71, the supernatant in the sludge storage tank 71 returns to the aeration grit chamber 1 through a clear liquid return pipe 711, the sludge in the sludge storage tank 71 is discharged into a sludge dewatering machine 72 for dewatering treatment, the treated filtrate returns to the aeration grit chamber 1 through a filtrate return pipe 721, and the treated sludge forms a solid mud cake to be transported outside.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A domestic sewage treatment device is characterized by comprising an aeration grit chamber (1), an anaerobic tank (2), an anoxic tank (3), an aerobic tank (4), a secondary sedimentation tank (5) and a reaction sedimentation tank (6) which are sequentially connected, wherein the secondary sedimentation tank (5) is provided with a sludge return pipe (51) connected with the anaerobic tank (2) and the anoxic tank (3), the sludge return pipe (51) comprises a first branch pipe (511) connected with the anaerobic tank (2) and a second branch pipe (512) connected with the anoxic tank (3), the first branch pipe (511) is provided with a first electromagnetic valve (52) for adjusting the opening degree, the second branch pipe (512) is provided with a second electromagnetic valve (53) for adjusting the opening degree, the aeration grit chamber (1) comprises a circular tank body (11), a water inlet (12), a water outlet (13), an aeration pipe (14) and a sand collecting tank (15) arranged at the bottom of the circular tank body (11), the aeration pipe (14) quantity is more than one and uses circular cell body (11) centre of a circle to become the ring shape distribution as the center, water inlet (12) set up at circular cell body (11) lateral wall with tangential direction, delivery port (13) set up at circular cell body (11) lateral wall and direction perpendicular to water inlet (12) direction.
2. The domestic sewage treatment apparatus according to claim 1, wherein the number of said aeration grit chamber (1) is more than one, and the water inlet (12) of the circular tank body (11) of the next aeration grit chamber (1) is connected with the water outlet (13) of the circular tank body (11) of the previous aeration grit chamber (1).
3. The domestic sewage treatment device according to claim 1, wherein said secondary sedimentation tank (5) is further connected with a sludge treatment device (7), said sludge treatment device (7) comprising a sludge storage tank (71) and a sludge dewatering machine (72) connected to said secondary sedimentation tank (5).
4. The domestic sewage treatment apparatus according to claim 3, wherein a clear liquid return pipe (711) connected to the aeration grit chamber (1) is provided at an upper layer of the sludge storage tank (71), and a filtrate return pipe (721) connected to the aeration grit chamber (1) is provided at an outlet of the sludge dewatering machine (72).
5. The domestic sewage treatment apparatus according to claim 1, wherein said anoxic tank (3) is provided with a mixed liquor return pipe (31) connected to the anaerobic tank (2).
6. The domestic sewage treatment apparatus according to claim 1, wherein said aerobic tank (4) is provided with a nitrifying liquid return pipe (42) connected to said anoxic tank (3).
7. The domestic sewage treatment device according to claim 1, wherein a grille device (8) is further arranged at the front end of the aeration grit chamber (1), and a filter screen (81) is detachably arranged on the grille device (8).
8. The domestic sewage treatment device according to claim 1, wherein the outlet of the reaction sedimentation tank (6) is further provided with an ultraviolet disinfection lamp (61).
9. The domestic sewage treatment apparatus according to claim 1, wherein said secondary sedimentation tank (5) is a radial sedimentation tank.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922489143.4U CN211595371U (en) | 2019-12-31 | 2019-12-31 | Domestic sewage treatment device |
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| CN201922489143.4U CN211595371U (en) | 2019-12-31 | 2019-12-31 | Domestic sewage treatment device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113072241A (en) * | 2019-12-31 | 2021-07-06 | 江苏开放大学（江苏城市职业学院） | Domestic sewage treatment device and treatment method thereof |
| CN113511778A (en) * | 2021-06-01 | 2021-10-19 | 成都师范学院 | Movable sewage treatment device |
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2019
- 2019-12-31 CN CN201922489143.4U patent/CN211595371U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113072241A (en) * | 2019-12-31 | 2021-07-06 | 江苏开放大学（江苏城市职业学院） | Domestic sewage treatment device and treatment method thereof |
| CN113511778A (en) * | 2021-06-01 | 2021-10-19 | 成都师范学院 | Movable sewage treatment device |
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