CN210945012U

CN210945012U - MBBR-MBR-BST combination formula sewage treatment device

Info

Publication number: CN210945012U
Application number: CN201921650970.0U
Authority: CN
Inventors: 刘艳; 姚李; 向华鹏
Original assignee: Shaanxi Jinke Environmental Protection Engineering Co ltd
Current assignee: Shaanxi Jinke Environmental Protection Engineering Co ltd
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2020-07-07
Anticipated expiration: 2029-09-29

Abstract

The utility model provides a MBBR-MBR-BST combination formula sewage treatment device solves current sewage treatment device when handling small-size hospital's blow off water, has ammonia nitrogen, total nitrogen etc. and is difficult to problem up to standard. The device comprises a pretreatment system and a biochemical advanced treatment system which are communicated along the water flow direction; the biochemical advanced treatment system comprises a reflux device, a bypass sedimentation device, a sludge tank, a flow guide device, an MBBR anaerobic device, an MBBR anoxic device, an MBBR aerobic device, an MBR and a disinfection device, wherein the flow guide device, the MBBR anaerobic device, the MBBR anoxic device, the MBBR aerobic device, the MBR and the disinfection device are communicated along the water flow direction; the flow guide device and the MBBR anoxic device are both communicated with a water outlet of the pretreatment system; fillers with the specific gravity being larger than that of water after film hanging are arranged in the anaerobic device, the anoxic device and the aerobic device; a stirrer is arranged in the anaerobic device; aeration fans are arranged in the aerobic device and the membrane bioreactor; supernatant of the membrane bioreactor is pumped into the disinfection device and is discharged after disinfection, and mixed liquor flows into the reflux device and then respectively flows back to the diversion device, the anoxic device and the bypass precipitation device.

Description

MBBR-MBR-BST combination formula sewage treatment device

Technical Field

The utility model belongs to the sewage treatment field, concretely relates to MBBR-MBR-BST combination formula sewage treatment device.

Background

With the development of modern industry and the rapid expansion of population, the problem of sewage treatment has become one of the most important environmental protection problems for human beings, and the effluent standard after sewage treatment requires more and more high standard to ensure that the treated sewage is discharged to avoid polluting the environment, and simultaneously, water resources can be effectively utilized to save water.

At present, some hospitals (the daily sewage treatment scale is less than 500 tons) located in small towns along rivers and rivers are provided, the municipal pipe network is difficult to lay, and therefore the sewage treatment needs to reach the first-level A standard and can be discharged into a receiving water body, but in recent years, the indexes of ammonia nitrogen and total nitrogen in the hospital sewage are high, after the treatment by the existing sewage treatment equipment, the total nitrogen, total phosphorus and suspended matters in the sewage are still difficult to stably reach the standard, and even some ammonia nitrogen can reach about 90mg/L, so that the drainage requirement cannot be met.

Therefore, a sewage treatment device is needed to solve the technical problem that the content of ammonia nitrogen and total nitrogen in the discharged water is still difficult to reach the standard after the treatment of the existing sewage treatment device.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem that the existing sewage treatment equipment has the defects that ammonia nitrogen, total nitrogen and the like are difficult to reach the standard when treating sewage discharged by some small hospitals, and provides the MBBR-MBR-BST combined sewage treatment equipment.

In order to achieve the above object, the present invention provides a technical solution:

an MBBR-MBR-BST combined sewage treatment device is characterized by comprising a pretreatment system and a biochemical advanced treatment system which are sequentially communicated along the water flow direction; the biochemical advanced treatment system comprises a reflux device, a bypass sedimentation device, a sludge tank, a flow guide device, an MBBR anaerobic device, an MBBR anoxic device, an MBBR aerobic device, a membrane bioreactor and a disinfection device which are sequentially communicated along the water flow direction;

the flow guide device and the MBBR anoxic device are both communicated with a water outlet of the pretreatment system; the sewage is divided into two paths after being treated by a pretreatment system, wherein the first path of sewage enters a flow guide device, and the second path of sewage enters an MBBR anoxic device;

fillers are arranged in the MBBR anaerobic device, the MBBR anoxic device and the MBBR aerobic device, the fillers are positioned on a filler bearing bracket, an anti-falling net is arranged at the upper part of the fillers and used for preventing the fillers from running, and the specific gravity of the fillers after film hanging is larger than that of water;

a stirrer is arranged in the MBBR anaerobic device; aeration fans are arranged in the MBBR aerobic device and the membrane bioreactor;

pumping the supernatant of the membrane bioreactor into a disinfection device through a suction pump, disinfecting and discharging;

the mixed liquor of the membrane bioreactor is divided into three paths after flowing into the reflux device through the outlet: the first path of mixed liquor and the second path of mixed liquor are respectively pumped into the diversion device and the MBBR anoxic device through a nitrifying liquid reflux pump arranged in the reflux device; and the third mixed liquid enters a bypass sedimentation device, after dephosphorization, sludge is discharged to a sludge tank, and supernatant liquid flows back to the flow guide device.

Further, pretreatment systems includes along the septic tank of rivers direction intercommunication in proper order, grid pond and quality of water volume equalizing basin, wherein, the outer transport of grid sediment is handled.

Furthermore, in order to make the structure of the whole equipment more compact, the flow guide device, the MBBR anaerobic device, the MBBR anoxic device, the MBBR aerobic device, the membrane bioreactor and the disinfection device are arranged in the same cylinder and are sequentially arranged from one end to the other end;

and the reflux device, the bypass sedimentation device and the sludge pond are arranged below the barrel inner membrane bioreactor in a flush manner.

Further, the first path of sewage and the second path of sewage are uniformly pumped into the flow guide device and the MBBR anoxic device through a first pump body, and the first pump body is a lifting pump;

the third mixed liquid is pumped into a bypass precipitation device through a second pump body;

pumping the sludge in the bypass sedimentation device into a sludge tank through a third pump body, wherein the third pump body is a sludge pump;

and the sludge in the sludge tank is subjected to filter-pressing dehydration through a fourth pump body and is cleaned regularly.

Furthermore, the fillers in the MBBR anaerobic device and the MBBR anoxic device are MBBR suspended fillers; the filler in the MBBR aerobic device is polyurethane filler; the anti-drop net is a PE net.

Furthermore, phosphorus accumulating bacteria are added into the MBBR anaerobic device;

a phosphorus removing agent is added into the bypass precipitation device;

and a sodium hypochlorite disinfectant is added into the disinfection device.

Furthermore, a liquid level meter is arranged in the membrane bioreactor and is in linkage with the suction pump, namely the opening and closing of the suction pump can be controlled according to the liquid level condition detected by the liquid level meter; and a pressure gauge is arranged on a water outlet pipe of the suction pump, and whether the membrane system is blocked or not can be judged according to transmembrane pressure difference.

Further, dissolved oxygen DO in the MBBR anaerobic device is less than 0.2 mg/L;

dissolved oxygen DO in the MBBR anoxic device is less than 0.3-0.5 mg/L;

the dissolved oxygen DO in the MBBR aerobic device is 2-4 mg/L.

Further, the MBR membrane in the membrane bioreactor adopts a flat plate hollow fiber membrane.

Further, the sewage treatment equipment is of a combined steel structure or a steel concrete structure.

The utility model has the advantages that:

the utility model adopts the MBBR-MBR-BST treatment mode to ensure the denitrification and dephosphorization effect of the whole process, and is suitable for the treatment scale of small hospitals in cities and towns and small-sized domestic sewage treatment stations (the daily treatment scale is less than 500 t/d). If for large-scale sewage plants, the investment is relatively high, the cost performance is not high, and the use is not recommended. Adopt simultaneously the utility model discloses sewage treatment device has:

1. the reaction rate is high. The biomembrane carrier particles move along with the water flow, and the bubbles released by the aeration pipe are sheared, blocked and adsorbed by the carrier and are divided into smaller bubbles; due to the shearing force of water flow and collision friction among carriers, the biological membrane on the outer surface of the carrier is thin, the biological activity is relatively high, and the biological reaction rate is high.

2. High volume load, compactness and saving land. The specific surface area of the carrier in the reactor is large, and a large number of microorganisms can be attached and propagated on the carrier, and aerobic, anoxic and anaerobic strains are distributed in layers. The diversification of the strains is beneficial to improving the treatment effect of the sewage and shortening the treatment time.

3. The water head loss is small, the blockage is not easy, the back washing is not needed, and the backflow is not needed generally. Because carrier and rivers can mix in whole reactor, avoid the possibility of jam, and make the pond hold make full use of, mix respond well in the reactor, shock load capacity is stronger. The pretreatment requirement is not high, and the problem of blockage does not exist.

4. The sewage treatment station is convenient to transform and upgrade. Firstly, as the MBBR tank is the same as a common contact oxidation tank in shape and structure, the filling rate of the reactor can be flexibly designed, so that convenience is provided for future upgrade, the MBBR tank does not need to be fixed with a bracket, and the bracket is added with a carrier, so that the MBBR tank is conveniently combined with the original activated sludge process to form a composite process; and the MBR membrane is combined, so that the effluent effect is better.

Drawings

FIG. 1 is a process flow diagram of the sewage treatment apparatus of the present invention;

FIG. 2 is a plan view of a biochemical advanced treatment system in the sewage treatment apparatus of the present invention;

FIG. 3a is a first elevation view of a biochemical advanced treatment system in the sewage treatment apparatus of the present invention;

FIG. 3b is a second vertical view of the biochemical advanced treatment system in the sewage treatment apparatus of the present invention;

FIG. 4a is a schematic view of the MBBR suspended filler in the sewage treatment equipment of the present invention;

FIG. 4b is a schematic view of the polyurethane filler in the sewage treatment apparatus of the present invention.

The reference numbers are as follows:

1-a pretreatment system; 11-a septic tank; 12-a grid tank; 13-a water quality and quantity adjusting tank; 2-biochemical advanced treatment system; 21-a flow guide device; 22-MBBR anaerobic devices; 23-MBBR anoxic devices; 24-MBBR aerobic device; 25-a membrane bioreactor; 26-a disinfection device; 27-a reflux unit; 28-bypass precipitation unit; 29-sludge tank; 3-an aeration fan; 4-a stirrer; 5-a first pump body; 6-a second pump body; 7-a third pump body; 8-a fourth pump body; 9-a suction pump; 10-nitrifying liquid reflux pump; 14-MBBR suspended filler; 15-a polyurethane filler; 16-MBR membrane.

Detailed Description

The invention is described in further detail below with reference to the following figures and specific examples:

as shown in fig. 1-4 b, an MBBR-MBR-BST combined sewage treatment plant comprises a pretreatment system 1 and a biochemical advanced treatment system 2 which are sequentially communicated along a water flow direction.

The pretreatment system 1 comprises a septic tank 11, a grating tank 12 and a water quality and quantity adjusting tank 13 which are sequentially communicated along the water flow direction, wherein the grating residues are transported and treated.

The biochemical advanced treatment system 2 comprises a flow guide device 21, an MBBR anaerobic device 22, an MBBR anoxic device 23, an MBBR aerobic device 24, a membrane bioreactor 25, a disinfection device 26, a reflux device 27, a bypass sedimentation device 28 and a sludge tank 29 which are positioned in the same cylinder; wherein, the diversion device 21, the MBBR anaerobic device 22, the MBBR anoxic device 23, the MBBR aerobic device 24, the membrane bioreactor 25 and the disinfection device 26 are sequentially arranged and communicated from one end of the cylinder to the other end along the water flow direction, and the reflux device 27, the bypass sedimentation device 28 and the sludge tank 29 are arranged below the inner membrane bioreactor 25 of the cylinder in parallel and level. The MBBR anaerobic device 22 is internally provided with a stirrer 4, and the MBBR aerobic device 24 and the membrane bioreactor 25 are internally provided with aeration fans 3.

After being pretreated by the pretreatment system 1, the sewage is divided into two parts by the first pump body 5 (lift pump) and respectively pumped into the diversion device 21 and the MBBR anoxic device 23, wherein the lattice slag in the grating tank 12 is transported outside. After the sewage is treated by the membrane bioreactor 25, the supernatant is pumped into a disinfection device 26 by a suction pump 9 and is discharged after reaching the standard after disinfection; the mixed liquor in the device area is divided into three paths after flowing into the reflux device 27 through the outlet: the first mixed solution and the second mixed solution respectively flow back to the diversion device 21 and the MBBR anoxic device 23 under the assistance of the nitrifying liquid reflux pump 10 arranged in the reflux device 27; the third mixed liquid is pumped into a bypass sedimentation device 28 through a second pump body 6, after dephosphorization, supernatant liquid of the bypass sedimentation device 28 flows back into a diversion device 21, and sludge of the bypass sedimentation device 28 is pumped into a sludge tank 29 through a third pump body 7 (also called a sludge pump); and the sludge in the sludge tank 29 is subjected to filter-pressing dehydration by the fourth pump body 8 and is cleaned regularly.

Therefore, the sewage reaches the first-grade A standard and is discharged into the receiving water body under the deepened treatment of the biochemical advanced treatment system. The function and the communication relation of the main processing device in the biochemical advanced treatment system are as follows:

MBBR anaerobic device

The organic carbon source of raw water in the inlet water is utilized to meet the requirement of C/P ratio for dephosphorization, and meanwhile, a stirrer is arranged in the device domain to utilize phosphorus accumulating bacteria to carry out biological phosphorus release on phosphorus in the sewage. MBBR suspended filler is arranged in the MBBR anaerobic device, the filler is arranged on a filler bearing bracket, and a PE net for preventing material leakage is arranged at the upper part of the filler bearing bracket; after the filler is filmed, the specific gravity is slightly larger than water, and under proper stirring intensity, the MBBR anaerobic tank is fluidized and turned over, so that dissolved oxygen DO is ensured to be less than 0.2 mg/L. The return sludge (namely the first path of mixed liquid) firstly enters a flow guide device at the front end of the MBBR anaerobic device, releases dissolved oxygen and then enters the MBBR anaerobic device.

MBBR anoxic device

Nitrifying liquid containing certain dissolved oxygen returned by the MBR reaction device is utilized to react, and the aim of further denitrification is achieved. In the process, the inlet of the nitrifying liquid reflux pump is positioned at the bottom of the MBBR anoxic device and can be made into a ring-shaped or other perforated pipe, the fluid in the tank is stirred by using the pressure of the effluent, and a stirrer is not required to be arranged independently. An MBBR suspended filler is arranged in the MBBR anoxic device, the filler is arranged on a filler bearing bracket, and a PE net for preventing material leakage is arranged at the upper part of the filler bearing bracket; after the filler is filmed, the specific gravity is slightly larger than water, and the MBBR anoxic tank is fluidized and turned over under proper stirring strength, so that dissolved oxygen DO is ensured to be less than 0.3-0.5 mg/L.

MBBR aerobic apparatus

The effluent of the MBBR anoxic device enters an organic matter degradation device, polyurethane filler is arranged in the reaction tank, the filler is arranged on a filler bearing bracket, and a PE net for preventing material leakage is arranged at the upper part of the filler bearing bracket; after the filler is coated with the membrane, the specific gravity is slightly larger than that of water, the MBBR aerobic tank is fluidized and turned over under proper stirring strength to form a biological membrane, an aeration fan is used for aeration and oxygen supply, aerobic microorganisms are used for reducing COD, BOD, ammonia nitrogen and the like in the sewage, and at the moment, the DO (dissolved oxygen) is maintained at 2-4 mg/L; the dual purposes of oxygen supply and fluidization are achieved by adopting aeration. Because the biological carrier moves irregularly in the reactor, the device can play a role in cutting and breaking bubbles, and the air distribution is uniform, thereby avoiding aeration dead angles.

The diversion device, the MBBR anaerobic device, the MBBR anoxic device and the MBBR aerobic device jointly form a Moving Bed Biofilm Reactor (MBBR).

4. Membrane Bioreactor (MBR)

The membrane bioreactor organically combines an ultrafiltration membrane separation technology and a biological treatment technology, and firstly, a membrane component replaces a tail end secondary sedimentation tank of the traditional biological treatment technology, the concentration of high-activity sludge is kept in the bioreactor, and the concentration of MLSS (mixed liquor suspended solid) can reach about 8000-10000 mg/L; and active sludge and macromolecular organic matters in water are intercepted mainly by using membrane separation equipment.

The membrane bioreactor can retain microorganisms with longer generation period due to effective interception, can realize deep purification of sewage, simultaneously nitrifying bacteria can be fully propagated in the system, has obvious nitrification effect, and provides possibility for deep phosphorus and nitrogen removal. The membrane bioreactor has high dissolved oxygen, and the gas-water ratio is controlled to be 25-30:1, so that the returned nitrified liquid contains high dissolved oxygen, and the requirement of an anoxic environment is met. The membrane bioreactor has thorough nitration reaction, and the mixed liquor at the stage flows back to the flow guide device and the MBBR anaerobic device, so that the membrane bioreactor has a good effect of removing total nitrogen. In addition, the membrane component is used as a joint section of the whole sewage treatment process route, and can ensure that the effluent SS (suspended matter) and the like stably reach the standard. The MBR membrane can adopt a flat plate type hollow fiber membrane newly developed in the market and can also adopt a flat plate membrane. The membrane bioreactor is provided with a liquid level meter which is linked with a suction pump, a pressure gauge is arranged on a water outlet pipe of the suction pump, and whether the membrane system is blocked or not is judged according to transmembrane pressure difference.

5. Bypass sedimentation device (BST)

The form of the bypass sedimentation device can be determined according to the actual site and the form of equipment. The bypass sedimentation device is mainly used for dephosphorization and residual sludge discharge. The method comprises the steps of quantitatively and uniformly pumping high-concentration mixed liquor in a reflux device into a bypass precipitation device by a pump according to a certain proportion every day, adding a chemical phosphorus removal agent into the bypass precipitation device, removing residual phosphorus in the system after biological phosphorus removal in the system from the system in a chemical phosphorus removal mode, and discharging residual phosphorus-containing sludge, wherein the content of phosphorus in a supernatant of the bypass precipitation device is very small, the supernatant flows back to a guide device at the front end, and the sewage with higher phosphorus content is diluted by the sewage with lower phosphorus content, so that the phosphorus removal purpose is achieved, and certain influence on a membrane caused by adding the phosphorus removal agent into an MBBR aerobic device is avoided (the MLVSS (the concentration ratio of volatile suspended solids in the mixed liquor, namely the SRT (sludge retention time) of the phosphorus removal agent is reduced and the biochemical effect is influenced by adding the phosphorus removal agent into the MBBR aerobic device for a long time).

6. Sludge tank

The filter pressing dehydration is carried out through the fourth pump body, and the sludge is cleaned regularly.

7. Reflow device

The mixed liquid of the membrane bioreactor flows into a reflux device through a water hole, a nitrified liquid reflux pump is arranged in the reflux device, and the mixed liquid is refluxed to a flow guide device and an MBBR anoxic device according to a reflux ratio of 250-300% and is used for removing T-N.

8. Disinfection device

The water quality of the membrane effluent is good, and a small amount of sodium hypochlorite solution is required to be added. At the moment, water in the disinfection tank can be used as backwashing water, and the low-concentration sodium hypochlorite solution can be used as backwashing water of the membrane after reaction in the disinfection tank under the condition of small addition amount, so that the sludge concentration of the high-concentration biomembrane reactor cannot be greatly influenced.

In the use process, the treatment load of each device domain is calculated according to the actual treatment working condition, and the water inlet proportion, the backflow proportion, the water inlet proportion of the bypass sedimentation device and the like are adjusted to ensure the optimal design of treatment efficiency.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a MBBR-MBR-BST combination formula sewage treatment device which characterized in that: comprises a pretreatment system (1) and a biochemical advanced treatment system (2) which are communicated along the water flow direction;

the biochemical advanced treatment system (2) comprises a reflux device (27), a bypass sedimentation device (28), a sludge pool (29), and a diversion device (21), an MBBR anaerobic device (22), an MBBR anoxic device (23), an MBBR aerobic device (24), a membrane bioreactor (25) and a disinfection device (26) which are sequentially communicated along the water flow direction;

the flow guide device (21) and the MBBR anoxic device (23) are both communicated with a water outlet of the pretreatment system (1); the sewage is divided into two paths after being treated by the pretreatment system (1), the first path of sewage enters the diversion device (21), and the second path of sewage enters the MBBR anoxic device (23);

fillers are arranged in the MBBR anaerobic device (22), the MBBR anoxic device (23) and the MBBR aerobic device (24), the fillers are positioned on the filler bearing bracket, and the upper parts of the fillers are provided with anti-dropping nets; the specific gravity of the filler after film hanging is larger than that of water;

a stirrer (4) is arranged in the MBBR anaerobic device (22); aeration fans (3) are arranged in the MBBR aerobic device (24) and the membrane bioreactor (25);

supernatant of the membrane bioreactor (25) is pumped into a disinfection device (26) through a suction pump (9) and is discharged after disinfection;

the mixed liquor of the membrane bioreactor (25) flows into a reflux device (27) through an outlet and then is divided into three paths: the first mixed solution and the second mixed solution are respectively pumped into a flow guide device (21) and an MBBR anoxic device (23) by a nitrifying liquid reflux pump (10) arranged in a reflux device (27); the third mixed liquid enters a bypass sedimentation device (28), and after dephosphorization, the sludge is discharged to a sludge tank (29), and the supernatant liquid flows back to the diversion device (21).

2. The MBBR-MBR-BST combined sewage treatment plant of claim 1, wherein: the pretreatment system (1) comprises a septic tank (11), a grid tank (12) and a water quality and water quantity adjusting tank (13) which are sequentially communicated along the water flow direction.

3. The MBBR-MBR-BST combined sewage treatment plant of claim 2, wherein: the flow guide device (21), the MBBR anaerobic device (22), the MBBR anoxic device (23), the MBBR aerobic device (24), the membrane bioreactor (25) and the disinfection device (26) are arranged in the same cylinder and are sequentially arranged from one end to the other end;

the reflux device (27), the bypass sedimentation device (28) and the sludge tank (29) are arranged below the barrel inner membrane bioreactor (25) in a flush manner.

4. The MBBR-MBR-BST combined sewage treatment plant of claim 3, wherein: the first path of sewage and the second path of sewage are uniformly pumped into a flow guide device (21) and an MBBR anoxic device (23) through a first pump body (5);

the third mixed liquid is pumped into a bypass precipitation device (28) through a second pump body (6);

the sludge in the bypass sedimentation device (28) is pumped into a sludge tank (29) through a third pump body (7);

and the sludge in the sludge tank (29) is subjected to filter pressing and dehydration through a fourth pump body (8).

5. The MBBR-MBR-BST combined sewage treatment plant of claim 4, wherein: the fillers in the MBBR anaerobic device (22) and the MBBR anoxic device (23) are MBBR suspended fillers (14); the filler in the MBBR aerobic device (24) is a polyurethane filler (15); the anti-drop net is a PE net.

6. The MBBR-MBR-BST combined sewage treatment plant of claim 5, wherein: phosphorus-accumulating bacteria are added into the MBBR anaerobic device (22);

a phosphorus removing agent is added into the bypass precipitation device (28);

and a sodium hypochlorite disinfectant is added into the disinfection device (26).

7. The MBBR-MBR-BST combined sewage treatment plant of claim 6, wherein: a liquid level meter is arranged in the membrane bioreactor (25) and is linked with the suction pump (9); and a pressure gauge is arranged on a water outlet pipe of the suction pump (9) and used for judging whether the membrane system is blocked.

8. The MBBR-MBR-BST combined sewage treatment plant of claim 7, wherein: dissolved oxygen DO in the MBBR anaerobic device (22) is less than 0.2 mg/L;

dissolved oxygen DO in the MBBR anoxic device (23) is less than 0.3-0.5 mg/L;

the dissolved oxygen DO in the MBBR aerobic device (24) is 2-4 mg/L.

9. The MBBR-MBR-BST combined sewage treatment plant of claim 8, wherein: the MBR membrane (16) in the membrane bioreactor (25) adopts a flat plate hollow fiber membrane.

10. The MBBR-MBR-BST combined sewage treatment plant of claim 9, wherein: the sewage treatment equipment is of a combined steel structure or a steel concrete structure.