CN210945247U - IFAS-MBR-BST combination formula sewage treatment device - Google Patents
IFAS-MBR-BST combination formula sewage treatment device Download PDFInfo
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- CN210945247U CN210945247U CN201921653170.4U CN201921653170U CN210945247U CN 210945247 U CN210945247 U CN 210945247U CN 201921653170 U CN201921653170 U CN 201921653170U CN 210945247 U CN210945247 U CN 210945247U
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Abstract
The utility model provides an IFAS-MBR-BST combination formula sewage treatment device solves the unable efficient utilization high-quality carbon source of existing equipment, can't combine biological and chemical dephosphorization to ensure out stable up to standard problem of water. The device comprises a pretreatment system and a biochemical advanced treatment system; the biochemical advanced treatment system comprises a reflux device, a bypass sedimentation device, a sludge tank, a biological selection device, a phosphorus removal device, a nitrogen removal device, an organic matter degradation device, a membrane bioreactor and a disinfection device which are communicated along the water flow direction; the biological selection device and the phosphorus removal device are both communicated with a water outlet of the pretreatment system; a stirrer is arranged in the phosphorus removal device; aeration fans are arranged in the organic matter degradation device and the membrane bioreactor; pumping the supernatant of the membrane bioreactor into a disinfection device, and dividing the mixed solution into three paths after the mixed solution flows into a reflux device; the first path and the second path are respectively pumped into a biological selection device and a denitrification device; the third way enters a bypass sedimentation device, sludge is discharged to a sludge tank, and supernatant liquid flows back to the biological selection device.
Description
Technical Field
The utility model belongs to the sewage treatment technology, in particular to IFAS-MBR-BST combined sewage treatment equipment.
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 standard requirement for the effluent after sewage treatment is higher and higher, so as to ensure that the treated sewage is discharged to avoid polluting the environment, and simultaneously, water resources can be effectively utilized, and water is saved.
At present, the used combined sewage treatment equipment still hardly realizes the stable standard of total nitrogen and total phosphorus, can not effectively utilize high-quality carbon sources in a denitrification link, can not combine biological phosphorus removal and chemical phosphorus removal in a phosphorus removal link, and finally hardly ensures that the effluent stably reaches the standard.
Therefore, it is very necessary to develop an IFAS-MBR-BST combined sewage treatment plant.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the unable effective high-quality carbon source of utilization of current combination formula sewage treatment device, and can not combine biological dephosphorization and chemical dephosphorization, ensure out the steady up-to-standard weak point of water, provide an IFAS-MBR-BST combination formula sewage treatment device.
In order to achieve the above object, the present invention provides a technical solution:
an IFAS-MBR-BST combined sewage treatment device is characterized by comprising 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, and a biological selection device, a phosphorus removal device, a nitrogen removal device, an organic matter degradation device, a membrane bioreactor and a disinfection device which are sequentially communicated along the water flow direction;
the biological selection device and the phosphorus removal 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 biological selection device, and the second path of sewage enters a phosphorus removal device;
a stirrer is arranged in the phosphorus removal device; aeration fans are arranged in the organic matter degradation 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 biological selection device and the denitrification device through a nitrification liquid reflux pump arranged in the reflux device; and the third mixed liquor enters a bypass sedimentation device, after dephosphorization, sludge is discharged to a sludge tank, and supernatant is returned to the biological selection device.
Furthermore, the pretreatment system comprises a septic tank, a grating tank and a water quality and water quantity adjusting tank which are sequentially communicated along the water flow direction; wherein, the grid slag in the grid pond is transported outside for treatment.
Furthermore, in order to make the structure of the whole equipment more compact, the biological selection device, the phosphorus removal device, the nitrogen removal device, the organic matter degradation device, the membrane bioreactor and the disinfection device are arranged in the same cylinder body 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 biological selection device and the phosphorus removal device through the first pump body; the first pump body can adopt a lift pump;
the third mixed liquid is pumped into a bypass precipitation device through a second pump body;
the sludge in the bypass sedimentation device is pumped into a sludge tank through a third pump body;
and the sludge in the sludge tank is subjected to filter-pressing dehydration through a fourth pump body and is cleaned regularly.
Further, the inlet of the nitrified liquid reflux pump is positioned at the bottom of the biological selection device, and the outlet of the nitrified liquid reflux pump is positioned at the bottom of the denitrification device; the reflux ratio of the nitrifying liquid reflux pump is 250-300%.
Furthermore, phosphorus accumulating bacteria are added in the phosphorus removal 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 organic matter degradation 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 discloses a novel combination processing mode of IFAS-MBR-BST can effectively utilize high-quality carbon source, combine biological dephosphorization and chemical dephosphorization in the dephosphorization link, make the effect of whole technology nitrogen and phosphorus removal guarantee to some extent, be applicable to the treatment scale (daily treatment water yield is less than 500t/d) of the town small water yield, this processing system can make the steel structure of combination formula, also can establish the steel concrete structure, overall structure is compact, the form is comparatively nimble.
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. 3 is a first elevation view of a biochemical advanced treatment system in the sewage treatment apparatus of the present invention;
FIG. 4 is a second vertical view of the biochemical advanced treatment system 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 biological selection device; 22-a phosphorus removal device; 23-a denitrification unit; 24-an organic matter degradation unit; 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.
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, an IFAS-MBR-BST combined sewage treatment plant includes a pretreatment system 1 and a biochemical advanced treatment system 2, which are sequentially connected in 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. The concrete pretreatment is that water passing through the septic tank 11 passes through a grating, sand setting and water quality and water quantity adjusting process.
The biochemical advanced treatment system 2 comprises a biological selection device 21, a phosphorus removal device 22, a nitrogen removal device 23, an organic matter degradation 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 biological selection device 21, the dephosphorization device 22, the denitrification device 23, the organic matter degradation 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 dephosphorizing device 22 is internally provided with a stirrer 4, and the organic matter degradation device 24 and the membrane bioreactor 25 are internally provided with an aeration fan 3.
After being pretreated by the pretreatment system 1, the sewage is divided into two parts by a first pump body 5 (a lift pump) and is respectively pumped into a biological selection device 21 and a dephosphorization device 22, wherein the grid slag in the grid pond 12 is transported outside for treatment. After the sewage is treated by the membrane bioreactor 25, the supernatant is pumped into the disinfection device 26 by the suction pump 9 and is discharged after reaching the standard after disinfection, and the mixed liquid in the region flows into the reflux device 27 through the outlet and then is divided into three paths: the first mixed liquid and the second mixed liquid respectively flow back to the biological selection device 21 and the denitrification device 23 under the assistance of the nitrification liquid reflux pump 10 arranged in the reflux device 27, the inlet of the nitrification liquid reflux pump 10 is positioned at the bottom of the biological selection device 21, and the outlet is positioned at the bottom of the denitrification device 23; the third mixed liquor is pumped into a bypass sedimentation device 28 through a second pump body 6, after dephosphorization, the supernatant of the bypass sedimentation device 28 flows back into a biological selection device 21, and the 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.
Finally, the sewage reaches the first-grade A standard and is discharged into a receiving water body under the deepening treatment of the biochemical advanced treatment system. The function and the communication relation of each processing area in the biochemical advanced treatment system are as follows:
1. biological selection device
The high-quality carbon source in the inlet water is utilized to react with the nitrifying liquid containing certain dissolved oxygen which flows back from the membrane bioreactor, so as to achieve the purpose of primary denitrification. In the process, the inlet of the nitrifying liquid reflux pump is positioned at the bottom of the biological selection device, and can be made into a ring-shaped or other forms of perforated pipes, and the fluid in the tank is stirred by using the pressure of the reflux inlet water without independently arranging a stirrer.
2. Phosphorus removal device
Because the content of dissolved oxygen in the effluent of the biological selection device is greatly reduced and the content of nitrate is also reduced, an anaerobic environment is easily formed, the C/P ratio requirement of phosphorus removal is met by utilizing the organic carbon source of raw water in the influent water, and meanwhile, a stirrer is arranged in the tank and performs biological phosphorus release on phosphorus in the sewage by utilizing phosphorus accumulating bacteria.
3. Denitrification device
Nitrifying liquid containing certain dissolved oxygen returned by the membrane bioreactor is used for reaction, so that the aim of further denitrification is fulfilled. In the process, the outlet of the nitrifying liquid reflux pump is positioned at the bottom of the denitrification device, and can be made into a perforated pipe in an annular or other form, and the fluid in the tank is stirred by using the pressure of the effluent without independently arranging a stirrer.
4. Organic matter degradation device
The effluent of the denitrification device enters an organic matter degradation device, biological carriers are arranged in the reaction tank to form a biological membrane, an aeration fan is used for aeration and oxygen supply, aerobic microorganisms are used for reducing COD (chemical oxygen demand), BOD (biochemical oxygen demand), ammonia nitrogen and the like in the sewage, and at the moment, dissolved oxygen DO (dissolved oxygen) is maintained at 2-4 mg/L. The attached and grown biomembrane is combined with the suspended and grown activated sludge, so that the effective denitrification and carbon removal can be realized, more effective biomass can be generated in a smaller volume by adding the biological carrier, the contribution of the biomembrane to the sludge amount in the water body is up to 6000mg/L, and the degradation capability of the system to organic matters can be improved by the newly added sludge. After the biological carrier is added into an activated sludge system, the SRT (sludge age) is improved, the nitrification reaction is facilitated, the sludge age is increased, the growth of protozoa, metazoan and other micro-animals is facilitated, and the reduction of the sludge yield is facilitated from the viewpoint of gradual decrease of the capacity by feeding bacteria. If the conditions allow, a suspension type biological carrier such as a polyurethane carrier can be selected, but a carrier support for preventing the material from running is required to be made.
The biological selection device, the phosphorus removal device, the nitrogen removal device and the organic matter degradation device jointly form a sludge-film symbiotic unit (IFAS).
5. 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 biological selection device and the denitrification device, so that the membrane bioreactor has good effect on removing the total nitrogen. In addition, the membrane component is used as a joint section of the whole sewage treatment process route, can ensure that the effluent SS (suspended solids) and the like stably reach the standard, and can adopt a flat plate type hollow fiber membrane newly developed in the market and also can 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 is blocked or not is judged according to transmembrane pressure difference.
6. 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 pumping high-concentration mixed liquor in a reflux device into a bypass precipitation device quantitatively and uniformly every day according to a certain proportion by using a pump, adding a chemical phosphorus removal agent into the bypass precipitation device, removing residual phosphorus in a system after biological phosphorus removal by using chemical phosphorus removal from the system, discharging phosphorus-containing residual sludge, returning the supernatant to a biological selection device at the front end of the system, diluting sewage with higher phosphorus content by using sewage with lower phosphorus content, and removing phosphorus.
7. Sludge tank
The filter pressing dehydration is carried out through the fourth pump body, and the sludge is cleaned regularly.
8. Reflow device
And 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 biological selection device and a denitrification device according to a reflux ratio of 250-300% for removing T-N.
9. Disinfection device
The water quality of the membrane effluent is good, and a small amount of sodium hypochlorite solution is 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 area 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 (10)
1. The utility model provides an IFAS-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 biological selection device (21), a phosphorus removal device (22), a nitrogen removal device (23), an organic matter degradation device (24), a membrane bioreactor (25) and a disinfection device (26) which are sequentially communicated along the water flow direction;
the biological selection device (21) and the dephosphorization device (22) 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 a biological selection device (21), and the second path of sewage enters a dephosphorization device (22);
a stirrer (4) is arranged in the phosphorus removal device (22); the organic matter degradation device (24) and the membrane bioreactor (25) are both provided with aeration fans (3);
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 path of mixed liquor and the second path of mixed liquor are respectively pumped into the biological selection device (21) and the denitrification device (23) through a nitrification liquid reflux pump (10) arranged in a reflux device (27); and the third mixed liquor enters a bypass sedimentation device (28), is subjected to dephosphorization, is discharged into a sludge tank (29), and returns the supernatant to the biological selection device (21).
2. The IFAS-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 IFAS-MBR-BST combined sewage treatment plant of claim 2, wherein: the biological selection device (21), the dephosphorization device (22), the denitrification device (23), the organic matter degradation 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 IFAS-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 biological selection device (21) and a phosphorus removal device (22) 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 IFAS-MBR-BST combined sewage treatment plant of claim 4, wherein: the inlet of the nitrifying liquid reflux pump (10) is located at the bottom of the biological selection device (21), the outlet of the nitrifying liquid reflux pump is located at the bottom of the denitrification device (23), and the reflux ratio of the nitrifying liquid reflux pump (10) is 250-300%.
6. The IFAS-MBR-BST combined sewage treatment plant of claim 5, wherein: phosphorus-accumulating bacteria are added in the phosphorus removal 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 IFAS-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 IFAS-MBR-BST combined sewage treatment plant of claim 7, wherein: dissolved oxygen DO in the organic matter degradation device (24) is 2-4 mg/L.
9. The IFAS-MBR-BST combined sewage treatment plant of claim 8, wherein: the MBR membrane in the membrane bioreactor (25) adopts a flat hollow fiber membrane.
10. The IFAS-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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921653170.4U CN210945247U (en) | 2019-09-29 | 2019-09-29 | IFAS-MBR-BST combination formula sewage treatment device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921653170.4U CN210945247U (en) | 2019-09-29 | 2019-09-29 | IFAS-MBR-BST combination formula sewage treatment device |
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| CN210945247U true CN210945247U (en) | 2020-07-07 |
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| CN201921653170.4U Active CN210945247U (en) | 2019-09-29 | 2019-09-29 | IFAS-MBR-BST combination formula sewage treatment device |
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