CN112520843A - Biological fluidized bed reaction zone process - Google Patents
Biological fluidized bed reaction zone process Download PDFInfo
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- CN112520843A CN112520843A CN202011050128.0A CN202011050128A CN112520843A CN 112520843 A CN112520843 A CN 112520843A CN 202011050128 A CN202011050128 A CN 202011050128A CN 112520843 A CN112520843 A CN 112520843A
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- biological
- fluidized bed
- reaction zone
- filler
- bed reaction
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention discloses a biological fluidized bed reaction zone process, which relates to the technical field of biological fluidized beds, in particular to a biological fluidized bed reaction zone process, a) an original BFB biological film is constructed by selecting proper particle materials, because the BFB adopts particles or even powder filling materials, the surface area is large, the high microbial biomass can be maintained in a fluidized bed, and the microbial biomass is as follows: 40-50 g/L. The biological fluidized bed reaction zone process uses ceramsite, rubber, plastic carriers and the like as microorganism carriers, and introduces air or pure oxygen with a certain flow velocity to enable sewage, compressed air and the microorganism carriers to flow upwards in an upflow zone and downwards in a downflow zone to form hydraulic circulation, and uses a biological film continuously growing on the surface of the carriers to adsorb, oxidize and decompose organic matters and nutrient substances in the sewage, thereby removing pollutants in the sewage.
Description
Technical Field
The invention relates to the technical field of biological fluidized beds, in particular to a reaction zone process of a biological fluidized bed.
Background
The biological fluidized bed is characterized in that sand is used as a filler and is used as a biofilm carrier, wastewater flows through the sand bed from bottom to top to enable the carrier layer to be in a flowing state, so that the contact area of the biofilm and the wastewater is increased in unit time and sufficient oxygen is supplied, a structure for the biological treatment process of the wastewater is enhanced by utilizing the boiling state of the filler, the surface area of the filler in the structure exceeds 3300m2/m3, the biofilm growing on the filler rarely falls off, a secondary sedimentation tank can be omitted, the membrane biological fluidized bed process is used for the deep treatment of the wastewater, and the indexes such as COD, NH-N, turbidity and the like can be further reduced through the biological fluidized bed and a ceramic membrane separation system on the basis of the standard discharge of the original wastewater, so that the biological fluidized bed can be directly recycled on the one hand, and can also be used as a pretreatment process for RO desalination treatment to replace, The inorganic ceramic membrane separation system is a special inorganic membrane separation system for sewage treatment in the world, and has the advantages of large membrane flux, backflushing, full-automatic operation and the like compared with other organic membranes and inorganic membranes.
But the solid-liquid separation effect of the effluent of the traditional aerobic biological fluidized bed is not ideal enough, the coverage of the traditional aerobic biological fluidized bed can not meet the use requirements of people and the reaction requirements of river sewage, and the filler material has the defects of higher production cost, difficulty in realizing large-area use and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a biological fluidized bed reaction zone process, which solves the problems that the solid-liquid separation effect of the effluent of the traditional aerobic biological fluidized bed provided in the background art is not ideal enough, the coverage surface of the traditional aerobic biological fluidized bed cannot meet the use requirements of people and the reaction requirements of river sewage, the production cost of a filler material is high, the large-area use is difficult to realize, and the like.
In order to achieve the purpose, the invention is realized by the following technical scheme: a biological fluidized bed reaction zone process comprises the following specific process steps:
a) the original BFB biological membrane is constructed by selecting proper particle materials, and because the BFB adopts particles or even powder fillers, the surface area is large, the high microbial biomass can be maintained in the fluidized bed, and the microbial biomass is as follows: 40-50 g/L;
b) the suspended filler in the reaction zone process is made of polyethylene material, then the aeration operation is realized in an aerobic reactor, the rising air bubbles are continuously blocked and broken by utilizing the irregular movement of the biological filler in a biological pond, the blockage problem in micropore aeration is avoided, the air distribution uniformity is required to be realized in the aeration process, and the stable air supply quantity is kept;
c) secondly, carrying out submersible stirring operation in the anaerobic reaction tank through the fan-shaped blades, wherein the stirring process needs to be kept uniform and slow, so that the biological filler and the water body generate a whirling water flow state, and a uniform mixing effect is achieved;
d) and finally, performing water outlet discharge operation on the biological tank, wherein the biological filler is required to be kept in the biological tank in the water outlet process, the pore size of the biological filler is determined by the external dimension of the biological filler, the shape of the water outlet device is in a porous flat plate type or a winding welding pipe type vertical or horizontal direction, the water outlet area depends on unit outflow loads with different pore sizes, and the water outlet device is not provided with movable parts and is not easy to wear.
Optionally, the particulate material in step a may be sand, activated carbon powder, coke, polyethylene material or porous balls as a carrier, and the filler specific gravity of the particulate material is between 0.96 and 1.30.
Optionally, in the case that no biofilm is attached to the surface of the polyethylene material in the step b, the specific gravity of the polyethylene material is close to 1g/cm 3.
Optionally, the installation position and angle of the stirrer in the step c need to maintain a sufficient adjusting space, the adjusting angle range of the stirrer is not less than 45 degrees, and the biological filler is prevented from being damaged in the stirring process.
The invention provides a biological fluidized bed reaction zone process, which has the following beneficial effects:
1. according to the biological fluidized bed reaction zone process, BFB can control the thickness of a biological film by controlling the shearing force of a filler through aeration quantity, and the thickness of a contact oxidation biological film is not controllable; BFB combines fluidization mechanism, adsorption mechanism and biochemical mechanism of carrier, combines the advantages of traditional activated sludge method and biofilm method, makes the system have high biomass and microbial activity by contact oxidation method, high volume load, strong impact load resistance, small occupied area, high mass transfer efficiency of activated sludge method, stable system, high oxygen conversion efficiency, controllable biofilm thickness and the like, and can adapt to different concentrations and different kinds of sewage.
2. In the biological fluidized bed reaction zone process, the BFB adopts particles or even powder filler, and the specific surface area is large, so that the fluidized bed can maintain extremely high microbial biomass (40-50 g/l); because the surface of the biological membrane is continuously updated, the microorganisms are always in a high activity state, and the substrate in the wastewater is fully contacted with the uniformly dispersed biological membrane in the reactor and is rapidly degraded and removed under a good mass transfer condition. The BFB volume load can be as high as 6-10kgBOD/m3.d, which is 10-20 times higher than that of the common activated sludge method, so the volume load is high and the occupied area is small.
3. In the BFB, sewage and filler are fully circulated, flowed and mixed by mass transfer, so that the reactor has great dilution and diffusion capacity, and wastewater is rapidly mixed and diluted after entering the reactor; the BFB biological membrane has high renewal speed, so that the BFB biological membrane keeps good biological activity, and a substrate in the wastewater is fully contacted with the uniformly dispersed biological membrane in the reactor and is rapidly degraded and diluted, so that the effect of sudden load change is buffered; the microorganism exists mainly in the form of biomembrane, and has strong resistance to toxic substances in raw water, so that the system has strong impact-resistant composite capacity, when impact load occurs, the COD removal rate may be reduced, but the system is recovered to normal quickly, and a regulating tank is not required to be arranged under normal conditions.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The invention provides a technical scheme that: a biological fluidized bed reaction zone process comprises the following specific process steps:
a) the original BFB biological membrane is constructed by selecting proper particle materials, and because the BFB adopts particles or even powder fillers, the surface area is large, the high microbial biomass can be maintained in the fluidized bed, and the microbial biomass is as follows: 40-50g/L, wherein the particle material in the step a can be sand, activated carbon powder, coke, polyethylene material or porous balls as a carrier, the specific gravity of the filler is between 0.96 and 1.30, and the BFB can control the thickness of the biofilm by controlling the shearing force of the filler through aeration amount and the thickness of the contact oxidation biofilm is not controllable; BFB combines fluidization mechanism, adsorption mechanism and biochemical mechanism of carrier, combines the advantages of traditional activated sludge method and biological membrane method, makes the system have high biomass and microbial activity by contact oxidation method, high volume load, strong impact load resistance, small occupied area, high mass transfer efficiency of activated sludge method, stable system, high oxygen conversion efficiency, controllable biological membrane thickness and the like, and can adapt to different concentrations and different kinds of sewage;
b) the suspended filler in the reaction zone process is made of polyethylene material, then the aeration operation is realized in an aerobic reactor, the irregular movement of the biological filler in a biological pool is utilized to continuously block and break rising air bubbles, the blockage problem in micropore aeration is avoided, the air distribution uniformity is required in the aeration process, the stable air supply quantity is kept, the specific gravity of the biological filler is close to 1g/cm3 under the condition that no biological membrane is attached to the surface of the polyethylene material in the step b, and the specific surface area of the biological fluidized bed reaction zone process is large because the BFB adopts particle or even powder filler, so that the extremely high microbial biomass (40-50g/l) can be maintained in a fluidized bed; because the surface of the biological membrane is continuously updated, the microorganisms are always in a high activity state, and the matrix in the wastewater is fully contacted with the uniformly dispersed biological membrane in the reactor and is rapidly degraded and removed under a good mass transfer condition. The BFB volume load can be as high as 6-10kgBOD/m3.d, which is 10-20 times higher than that of the common activated sludge method, so the volume load is high and the occupied area is small;
c) secondly, carrying out submersible stirring operation in the anaerobic reaction tank through the fan-shaped blades, wherein the stirring process needs to be kept uniform and slow, so that the biological filler and the water body generate a whirling water flow state, and a uniform mixing effect is achieved;
d) finally, carrying out effluent discharge operation on the biological tank, wherein the requirement of keeping the biological filler in the biological tank is met in the effluent process, the aperture size of the biological filler is determined by the external dimension of the biological filler, the shape of the effluent device is a porous flat plate type or a winding welding pipe type, the vertical or horizontal direction, the effluent area depends on unit effluent loads with different apertures, the effluent device has no movable part and is not easy to wear, the installation position and the angle of the stirrer in the step c need to keep enough adjusting space, the adjusting angle range is not less than 45 degrees, the biological filler is prevented from being damaged in the stirring engineering, the biological fluidized bed reaction zone process has the advantages that in BFB, sewage and the filler are sufficiently circulated, the mass transfer and the mixing are carried out, so that the reactor has great dilution and diffusion capacity, and wastewater is rapidly mixed and diluted after entering the reactor; the BFB biological membrane has high renewal speed, so that the BFB biological membrane keeps good biological activity, and a substrate in the wastewater is fully contacted with the uniformly dispersed biological membrane in the reactor and is rapidly degraded and diluted, so that the effect of sudden load change is buffered; the microorganism exists mainly in the form of a biological membrane and has strong resistance to toxic substances in raw water, so that the system has strong impact resistant composite capacity, when impact load occurs, the COD removal rate may be reduced, but the system is recovered to be normal quickly, and a regulating tank is not required to be arranged under the normal condition.
In summary, the biological fluidized bed reaction zone process comprises the following specific process steps:
a) the original BFB biological membrane is constructed by selecting proper particle materials, and because the BFB adopts particles or even powder filler, the surface area is large, the high microbial biomass can be maintained in the fluidized bed, and the microbial biomass is as follows: 40-50 g/L;
b) the suspended filler in the reaction zone process is made of polyethylene material, then the aeration operation is realized in an aerobic reactor, the rising air bubbles are continuously blocked and broken by utilizing the irregular movement of the biological filler in a biological pond, the blockage problem in micropore aeration is avoided, the air distribution uniformity is required to be realized in the aeration process, and the stable air supply quantity is kept;
c) secondly, carrying out submersible stirring operation in the anaerobic reaction tank through the fan-shaped blades, wherein the stirring process needs to be kept uniform and slow, so that the biological filler and the water body generate a whirling water flow state, and a uniform mixing effect is achieved;
d) finally, the effluent discharge operation is carried out on the biological tank, the biological filler is required to be kept in the biological tank in the effluent process, the aperture size of the biological filler is determined by the external dimension of the biological filler, the shape of the effluent device is a porous flat plate type or a winding welding pipe type vertical or horizontal direction, the effluent area depends on unit effluent load with different apertures, and the effluent device is not provided with a movable part and is not easy to wear;
the granular material in the step a can select sand, activated carbon powder, coke, polyethylene material or porous balls as carriers, and the specific weight of the filler is between 0.96 and 1.30.
Under the condition that no biomembrane is attached to the surface of the polyethylene material in the step b, the specific gravity of the polyethylene material is close to 1g/cm 3.
And c, the mounting position and angle of the stirrer in the step c need to keep enough adjusting space, the adjusting angle range is not less than 45 degrees, and the biological filler is prevented from being damaged in the stirring engineering.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the scope of the present invention, and the technical solutions and the inventive concepts of the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (4)
1. A biological fluidized bed reaction zone process, characterized in that:
a) the original BFB biological membrane is constructed by selecting proper particle materials, and because the BFB adopts particles or even powder fillers, the surface area is large, the high microbial biomass can be maintained in the fluidized bed, and the microbial biomass is as follows: 40-50 g/L;
b) the suspended filler in the reaction zone process is made of polyethylene material, then the aeration operation is realized in an aerobic reactor, the irregular movement of the biological filler in a biological pond is utilized to continuously block and break rising air bubbles, the blockage problem in micropore aeration is avoided, the uniformity of air distribution is required in the aeration process, and the stable air supply is kept;
c) secondly, carrying out submersible stirring operation in the anaerobic reaction tank through the fan-shaped blades, wherein the stirring process needs to be kept uniform and slow, so that the biological filler and the water body generate a whirling water flow state, and a uniform mixing effect is achieved;
d) and finally, performing water outlet discharge operation on the biological tank, wherein the biological filler is required to be kept in the biological tank in the water outlet process, the pore size of the biological filler is determined by the external dimension of the biological filler, the shape of the water outlet device is a porous flat plate type or a winding welding pipe type, the water outlet device is in a vertical or horizontal direction, the water outlet area depends on unit outflow loads with different pore sizes, and the water outlet device is not provided with a movable part and is not easy to wear.
2. The biological fluidized bed reaction zone process of claim 1, wherein: the granular material in the step a can select sand, activated carbon powder, coke, polyethylene material or porous balls as carriers, and the specific weight of the filler is between 0.96 and 1.30.
3. The biological fluidized bed reaction zone process of claim 1, wherein: under the condition that no biomembrane is attached to the surface of the polyethylene material in the step b, the specific gravity of the polyethylene material is close to 1g/cm 3.
4. The biological fluidized bed reaction zone process of claim 1, wherein: and c, the mounting position and angle of the stirrer in the step c need to keep enough adjusting space, the adjusting angle range is not less than 45 degrees, and the biological filler is prevented from being damaged in the stirring engineering.
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| CN202011050128.0A CN112520843A (en) | 2020-09-29 | 2020-09-29 | Biological fluidized bed reaction zone process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113735388A (en) * | 2021-09-28 | 2021-12-03 | 无锡海拓环保装备科技有限公司 | Biological multi-efficiency reactor |
| CN114906976A (en) * | 2022-03-14 | 2022-08-16 | 安徽工业大学 | Device and method for treating heavy metal sewage by using plastic fragments of biological membrane |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102167469A (en) * | 2010-12-03 | 2011-08-31 | 北京林业大学 | Fluidized bed film bioreactor for sewage treatment |
| CN108314268A (en) * | 2018-03-27 | 2018-07-24 | 南京万德斯环保科技股份有限公司 | The carrier for embedding press filtration sludge is combined the method and system of processing landfill leachate with fluid bed |
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2020
- 2020-09-29 CN CN202011050128.0A patent/CN112520843A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102167469A (en) * | 2010-12-03 | 2011-08-31 | 北京林业大学 | Fluidized bed film bioreactor for sewage treatment |
| CN108314268A (en) * | 2018-03-27 | 2018-07-24 | 南京万德斯环保科技股份有限公司 | The carrier for embedding press filtration sludge is combined the method and system of processing landfill leachate with fluid bed |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113735388A (en) * | 2021-09-28 | 2021-12-03 | 无锡海拓环保装备科技有限公司 | Biological multi-efficiency reactor |
| CN114906976A (en) * | 2022-03-14 | 2022-08-16 | 安徽工业大学 | Device and method for treating heavy metal sewage by using plastic fragments of biological membrane |
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Application publication date: 20210319 |