CN111268856A - HEBR bioreactor, sewage treatment system and sewage treatment method - Google Patents
HEBR bioreactor, sewage treatment system and sewage treatment method Download PDFInfo
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- 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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Activated Sludge Processes (AREA)
Abstract
The invention relates to a HEBR bioreactor, a sewage treatment system and a sewage treatment method. The HEBR bioreactor comprises a shell, wherein a biochemical reaction area and a separation area are arranged in the shell; a biological filler and an aeration system are arranged in the biochemical reaction area; the disengagement zone is equipped with the guide plate, air guide plate and the sludge reflux board of being connected with the one end of guide plate, the guide plate is kept away from and is formed the inlet between the one end of air guide plate and the roof of casing, the one end that the guide plate was kept away from to the air guide plate is separated with the sludge reflux board and is formed the sludge reflux seam, the one end that the air guide plate was kept away from to the sludge reflux board is with the lateral wall butt of casing, be equipped with in the disengagement zone and keep off the flow board, keep off and flow board and guide plate relative interval and set up, and keep off the one end of flowing the board and be higher than the liquid level in the casing, the other end that keeps off and flow board sets. The HEBR bioreactor has small occupied area and high treatment efficiency.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a HEBR bioreactor, a sewage treatment system and a sewage treatment method.
Background
In order to improve the water environment quality, the country is vigorously advancing the construction work of sewage treatment facilities such as black and odorous water treatment, polluted water emergency treatment and the like. Such sewage treatment facilities generally require small floor space, simple and convenient operation and maintenance, and the like. The existing mature technologies comprise a Membrane Bioreactor (MBR), ultra-magnetic separation and the like, wherein the MBR occupies a small area, but has the problems of easy blockage of a membrane component, large operation and maintenance amount and high energy consumption; the supermagnetic separation has the advantages of small occupied area, simple operation, small maintenance amount and the like, but can only remove insoluble pollutants, and has poor effect of removing soluble pollutants such as ammonia nitrogen and the like.
The integrated batch bioreactor (IBR) is a biochemical reactor integrating biochemistry, sedimentation and sludge backflow, and realizes a high sludge concentration (or high biomass) biochemical reactor similar to MBR (membrane bioreactor) by reaction, sedimentation and sludge backflow so as to achieve higher treatment efficiency and realize pollutantThe efficient removal is realized, and the occupied area is reduced. The biochemical reactor sedimentation system generally adopts inclined plate (or inclined tube) sedimentation, but when the inclined plate (or inclined tube) sedimentation is used as a secondary sedimentation tank, the solid load of the sedimentation system cannot be too large (generally 192 kg/m)2And d), otherwise, the treatment effect is unstable, and the sludge is easy to float. According to the formula G ═ QX/a (where G denotes a solid load, Q denotes a treatment amount, X denotes a sludge concentration, and a denotes a secondary sedimentation tank area) for calculating the solid load, the higher the sludge concentration X is, the larger the secondary sedimentation tank area a is, when the solid flux G is the same as the treatment amount Q is. Therefore, in order to meet the solid load limitation requirement of an inclined plate (or inclined tube) sedimentation tank, the IBR reactor has the problem that when the sludge concentration is higher, the area of a secondary sedimentation tank is often larger, and the whole occupied area is still larger.
Disclosure of Invention
In view of this, there is a need for a HEBR bioreactor that has a small footprint, high process efficiency, and is easy to maintain.
In addition, a sewage treatment system and a sewage treatment method are also provided.
An HEBR bioreactor comprises a shell, wherein the shell can contain sewage and activated sludge, and a biochemical reaction area and a separation area are arranged in the shell;
a biological filler is arranged in the biochemical reaction zone, and an aeration system is also arranged in the biochemical reaction zone so as to fluidize the biological filler and uniformly mix the sewage and the activated sludge;
the separation area is provided with a guide plate, an air guide plate and a sludge reflux plate which are connected with one end of the guide plate, a liquid inlet is formed between one end of the guide plate far away from the air guide plate and the top wall of the shell, one end of the air guide plate far away from the guide plate is separated from the sludge reflux plate to form a sludge reflux slit, one end of the sludge reflux plate far away from the air guide plate is abutted against the side wall of the shell, the separation area and the biochemical reaction area are separated by the guide plate, the air guide plate and the sludge reflux plate, a flow baffle plate is arranged in the separation area, the flow baffle plate and the guide plate are oppositely arranged at intervals, one end of the flow baffle plate is abutted against the top wall of the shell, the other end of the flow baffle plate is arranged at an interval with the air guide plate, and a vertically combined water collecting tank and filter material filler are also arranged between the side wall of, the water collecting tank is in contact with the side wall of the shell and the flow baffle, and the filter material filler is in contact with the side wall of the shell and the flow baffle.
In one embodiment, the biological filler is a suspended filler or a fixed filler, and when the biological filler is a suspended filler, an upper filler intercepting net and a lower filler intercepting net are further arranged in the biochemical reaction region, the upper filler intercepting net can shield the liquid inlet, and the lower filler intercepting net can shield the sludge backflow seam, so that the biological filler is intercepted in the biochemical reaction region.
In one embodiment, when the biological filler is suspended filler, the filling ratio of the biological filler is 5-60%; when the biological filler is a fixed filler, the filling ratio of the biological filler is 40-60%.
In one embodiment, the included angle between the guide plate and the air guide plate is 130-160 degrees.
In one embodiment, the included angle between the air guide plate and the sludge return plate is 30-90 degrees.
In one embodiment, the aeration system uses a microporous aeration disc, a tubular aerator or a perforated aerator pipe for aeration.
In one embodiment, a water outlet is formed in one side, which is abutted against the shell, of the water collecting tank, so that supernatant obtained after the HEBR bioreactor is treated is discharged.
In one embodiment, the filter material filler comprises at least one of a fiber ball soft filter material, an activated carbon modified sponge filter material and an inclined tube filter material.
In one embodiment, the material of the inclined tube filter material is stainless steel, polypropylene, polyvinyl chloride, ethylene-propylene copolymer or glass fiber reinforced plastic.
In one embodiment, the HEBR bioreactor is circular or square in shape.
A sewage treatment system comprises the HEBR bioreactor.
In one embodiment, the system further comprises a vertical anoxic-anaerobic tank, wherein a stirring system is arranged in the vertical anoxic-anaerobic tank, the vertical anoxic-anaerobic tank is communicated with the biochemical reaction area of the HEBR bioreactor, so that sewage treated by the vertical anoxic-anaerobic tank flows into the HEBR bioreactor, a nitrifying liquid reflux device is further arranged between the vertical anoxic-anaerobic tank and the HEBR bioreactor, the nitrifying liquid reflux device is communicated with the vertical anoxic-anaerobic tank and the biochemical reaction area of the HEBR bioreactor, and the nitrifying liquid reflux device can enable nitrifying liquid treated by the biochemical reaction area to flow back into the vertical anoxic-anaerobic tank.
In one embodiment, the device further comprises a grid adjusting tank, a mixing tank is further arranged in the vertical anoxic-anaerobic tank, sewage treated by the grid adjusting tank can flow into the mixing tank, the mixing tank is further communicated with the nitrifying liquid reflux device, and the nitrifying liquid reflux device can enable nitrifying liquid obtained after the biochemical reaction area is treated to flow into the mixing tank and be mixed with the sewage treated by the grid adjusting tank.
In one embodiment, the upper end of the mixing tank is 20-60 cm higher than the liquid level in the vertical anoxic-anaerobic tank, and the lower end of the mixing tank is 30-50 cm lower than the liquid level in the vertical anoxic-anaerobic tank.
In one embodiment, the system further comprises a secondary sedimentation tank communicated with the water collecting tank, an ultraviolet disinfection system communicated with the secondary sedimentation tank, so that the treatment liquid flowing out of the water collecting tank is sequentially treated by the secondary sedimentation tank and the ultraviolet disinfection system, and the sewage treatment system further comprises a sludge storage tank communicated with a biochemical reaction area of the HEBR bioreactor and a sludge dewatering system communicated with the sludge storage tank, so that the sludge returned to the biochemical reaction area by the separation area is conveyed to the sludge storage tank and is dewatered by the sludge dewatering system.
A sewage treatment method comprises the following steps:
providing the above sewage treatment system; and
and treating sewage by adopting the sewage treatment system.
In one embodiment, the wastewater treatment system further comprises: grid equalizing basin, rectilinear lack-anaerobism pond, two heavy ponds, ultraviolet disinfection system, mud reservoir and sludge dewatering system, with the step that sewage treatment system handles sewage includes:
enabling the sewage to sequentially flow into the grid adjusting tank, the vertical anoxic-anaerobic tank and the HEBR bioreactor to obtain supernatant and residual sludge treated by the HEBR bioreactor;
enabling the supernatant to sequentially flow into the secondary sedimentation tank and the ultraviolet disinfection system and then discharging after reaching the standard;
and conveying the excess sludge to the sludge dewatering system through the sludge storage tank to obtain treated sludge.
The HEBR bioreactor is internally provided with a biochemical reaction area and a separation area, the biochemical reaction area is filled with biological fillers, an aeration system is used for fluidizing the biological fillers, and the fluidized biological fillers can be used as carriers for the growth of microorganisms to realize the fixed growth of the microorganisms. The concentration of activated sludge can be reduced while ensuring high biomass in the HEBR bioreactor, the solid load limitation of filter material fillers can be effectively solved, and the occupied area of a separation zone is effectively reduced. In addition, through the adjustment of the structure of the separation area, sewage and sludge treated in the biochemical reaction area enter the separation area from the liquid inlet through a channel between the guide plate and the flow baffle plate, flow upwards under the action of the flow baffle plate and enter the filter material filler, the sludge is intercepted and precipitated by the filter material filler in the ascending process, the precipitated sludge flows back into the biochemical reaction area through the sludge backflow seam and along the gravity of the sludge backflow plate, and clear water separated by the filter material filler is collected through the water collecting tank. In addition, the gas guide plate is arranged to separate gas from sewage in the biochemical reaction area, so that the gas moves upwards along the gas guide plate and finally returns to the biochemical reaction area, thereby ensuring that the gas cannot flow into the separation area to influence the solid-liquid separation effect and ensuring the quality of effluent water. Therefore, the HEBR bioreactor is provided with the biochemical reaction area and the separation area in one shell, and the biological filler in the biochemical reaction area can fix the growing microorganism, thereby reducing the sludge concentration entering the separation area and reducing the occupied area of the separation area. And the solid-liquid separation effect of the sewage is improved by the arrangement of the specific structure of the separation zone.
Drawings
FIG. 1 is a schematic diagram of the structure of an embodiment of a HEBR bioreactor;
FIG. 2 is a schematic view of an embodiment of a wastewater treatment system;
FIG. 3 is a schematic view of the vertical anoxic-anaerobic tank and HEBR bioreactor in the wastewater treatment system of FIG. 2;
FIG. 4 is another schematic view of the vertical anoxic-anaerobic tank and HEBR bioreactor in the wastewater treatment system of FIG. 2.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following description taken in conjunction with the accompanying drawings. The detailed description sets forth the preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, an HEBR Bioreactor 100 according to an embodiment is a high efficiency three-phase HEBR Bioreactor (HEBR Bioreactor for short), and includes a housing 101, the housing 101 can contain sewage and activated sludge, and a biochemical reaction area 110 and a separation area 120 are disposed in the housing 101. The biochemical reaction area 110 and the separation area 120 are combined and constructed vertically. Specifically, in the illustration, the separation region 120 is located above the biochemical reaction region 110.
Wherein, a biological filler 112 is arranged in the biochemical reaction area 110. Specifically, the biological fillers 112 are suspended fillers or fixed fillers. Specifically, the suspended filler is a filler made of a modified polyurethane material or a biologically modified HDPE polymer material. The fixed filler is combined filler or elastic filler.
The biochemical reaction region 110 is filled with suspended filler or fixed filler, which can be used as a carrier for the growth of microorganisms to realize the fixed growth of microorganisms. The solid load limitation of the inclined plate (or inclined tube) sedimentation tank can be effectively solved while ensuring high biomass in the HEBR bioreactor 100, and the floor area of the secondary sedimentation tank is effectively reduced.
In one embodiment, the biochemical reaction zone 110 is filled with a suspension filler. The filling ratio of the suspended filler is 5 to 60 percent. It should be noted that, in this context, the filling ratio refers to the ratio of the volume of the biological filler 112 to the volume of the biochemical reaction area 110. When the biochemical reaction region 110 is filled with suspended fillers, a filler blocking net is also required to be arranged in the biochemical reaction region 110 to prevent the suspended fillers from entering the separation region 120. Specifically, in the illustration, the infill interception mesh comprises an upper infill interception mesh 116 and a lower infill interception mesh 118.
The biochemical reaction zone 110 is filled with suspended filler, and air bubbles are finer by utilizing the collision and shearing action of the filler in water, so that the utilization rate of oxygen is increased. In addition, different biological species are arranged inside and outside each carrier, anaerobic bacteria or facultative bacteria grow inside the carriers, and aerobic bacteria grow outside the carriers, so that each carrier becomes a micro-reactor, and the pollutant removal effect is greatly improved.
In another embodiment, the biochemical reaction zone 110 is filled with a fixed filler. The filling ratio of the fixed filler is 40-60%.
Further, the biochemical reaction zone 110 is provided with an aeration system 114 to fluidize the biological stuffing 112 and to bring the sewage and the activated sludge into a completely mixed state. In one embodiment, the aeration system 114 employs micro-porous aeration disks, tubular aerators, or perforated aerators. Further, the aeration system 114 employs microporous aeration disks for aeration.
Specifically, the separation region 120 is provided with a guide plate 121, an air guide plate 122 and a sludge return plate 123 connected with one end of the guide plate 121, a liquid inlet 124 is formed between one end of the guide plate 121 far away from the air guide plate 122 and the top wall of the shell 101, one end of the air guide plate 122 far away from the guide plate 121 is spaced from the sludge return plate 123 to form a sludge return slit 125, one end of the sludge return plate far away from the air guide plate 122 is abutted against the side wall of the shell 101, the separation region 120 is separated from the biochemical reaction region 110 by the guide plate 121, the air guide plate 122 and the sludge return plate 123, a flow baffle plate 126 is arranged in the separation region 120, the flow baffle plate 126 and the guide plate 121 are oppositely spaced, one end of the flow baffle plate 126 is higher than the liquid level in the shell 101, the other end of the flow baffle plate 126 is spaced from the air guide plate 122, a vertically combined water collecting tank 127 and a filler 128 are also arranged between the, Baffle plate 126 is in contact with the side wall of housing 101 and filter media 128 is in contact with baffle plate 126.
The guide plate 121 enables the slurry mixture treated in the biochemical reaction area 110 to enter a channel formed by the guide plate 121 and the flow baffle plate 126 through the liquid inlet 124, and the flow baffle plate 126 enables the slurry mixture to be guided to enter the filter material filler 128 for treatment, so as to prevent incomplete solid-liquid separation caused by short flow. Specifically, in the illustration, the baffles 121 and baffles 126 are oppositely spaced and parallel. The end of the baffle plate 126 remote from the air guide plate 122 abuts the top wall of the housing 101. After the sludge-water mixture treated in the biochemical reaction zone 110 enters the separation zone 120, on one hand, the sludge-water mixture is self-precipitated to generate solid-liquid separation, and on the other hand, the sludge-water mixture is intercepted by the filter material filler 128 to precipitate the sludge.
Specifically, in the illustration, the water collection tank 127 is positioned above the filter media pack 128 to ensure uniform water egress. In this embodiment, the filter material filler 128 and the water collection tank 127 form a solid-liquid separation unit, the sludge is intercepted by the filter material filler 128 and then returns to the biochemical reaction region 110 through the sludge backflow plate 123 via the sludge backflow slit 125, and the liquid in the sewage enters the water collection tank 127 after being treated by the filter material filler 128 and finally flows out of the HEBR bioreactor 100 via the water collection tank 127.
Specifically, the filter material filler 128 includes at least one of a fiber ball soft filter material, an activated carbon modified sponge filter material, and an inclined tube filter material. The material of the pipe chute filter material can be stainless steel material, PP (polypropylene) material, PVC (polyvinyl chloride) material, PP + PE (ethylene propylene copolymer) material or FRP (fiber reinforced plastic) material and the like.
The sludge return plate 123 and the air guide plate 122 constitute a gas-liquid separation unit. And the sludge return plate 123 and the air guide plate 122 are both positioned below the filter material filler 128. One end of the sludge-return plate 123 is connected to the side wall of the HEBR bioreactor 100. One end of the air guide plate 122 is connected to the guide plate 121. Specifically, the angle between the air guide plate 122 and the guide plate 121 is 130-160 degrees, so as to ensure the effect of mud-water separation. The sludge return plate 123 and the air guide plate 122 are not in contact with each other, and a sludge return slit 125 is formed. Specifically, the angle between the sludge recirculation plate 123 and the air guide plate 122 is 30-90 °. The air guide plate 122 is used for preventing the gas in the biochemical reaction region 110 from entering the solid-liquid separation unit, so as to ensure the sludge-water separation effect.
Specifically, when the biochemical reaction region 110 is filled with suspended fillers, the biochemical reaction region 110 further includes a filler intercepting net to prevent the suspended fillers from entering the separation region 120 through the diversion trench. Specifically, the packing interception mesh includes an upper packing interception mesh 116 and a lower packing interception mesh 118. The upper filler intercepting screen 116 is used for intercepting the suspended filler and preventing the filler from entering the solid-liquid separation unit through the diversion trench. The lower packing interception net 118 can block the sludge backflow slit 125 to prevent the biological packing 112 of the biochemical reaction region 110 from entering the separation region 120 through the sludge backflow slit 125.
The separation zone 120 described above operates as follows: after the biological filler 112 and the sludge-water mixture reacted in the biochemical reaction region 110 are intercepted by the filler upper intercepting net 116, the biological filler 112 is intercepted in the biochemical reaction region 110, the sludge-water mixture is guided by the liquid inlet 124 and the guide plate 121 to enter the separation region 120, the sludge-water mixture is guided by the flow baffle plate 126 and flows upwards, the sludge is intercepted and precipitated by the filter material filler 128 in the ascending process, the precipitated sludge flows back into the biochemical reaction region 110 by gravity along the sludge return plate 121 through the sludge return slit 125, and the clear water separated by the filter material filler 128 is collected by the water collecting tank 127 and then discharged by the water discharging port. The gas-liquid separation unit arranged at the lower part of the solid-liquid separation unit can form a circulation below the gas guide plate 122 because only one sludge backflow seam 125 can backflow sludge, so that gas in the biochemical reaction area 110 is mainly separated from a mud-water mixture, the gas moves upwards along the gas guide plate 122 and finally returns to the biochemical reaction area 110, the gas is ensured not to flow into the solid-liquid separation unit, the solid-liquid separation effect is influenced, and the effluent quality is ensured.
In this embodiment, HEBR bioreactor 100 may be designed in a circular or square configuration as desired.
In the traditional technology, in order to solve the problem of large floor space of the secondary sedimentation tank, a vertical combined construction mode of the secondary sedimentation tank and the biochemical reaction tank is usually adopted, namely the top of the biochemical reaction tank is the secondary sedimentation tank, but the solution is only to vertically combine the secondary sedimentation tank and the biochemical reaction tank, the area of the secondary sedimentation tank is still large, the secondary sedimentation tank part actually occupies large volume of the biochemical tank, and under the condition of the same reaction residence time and floor space, the reactor has higher vertical height and higher construction cost. Meanwhile, most of the area (more than 80%) of the top of the biochemical reaction tank is an inclined plate (or inclined tube) sedimentation tank, and the biochemical reaction tank is arranged below the inclined plate (or inclined tube) sedimentation tank, so that the operation and maintenance are inconvenient.
In the traditional IFAS process (fixed biological membrane-activated sludge process, also called sludge membrane composite process), a certain amount of suspended biological carriers are added into a biochemical reaction tank to construct an activated sludge and fixed biological membrane composite treatment system, so that the biomass and biological species in the biochemical reaction tank are further improved on the basis of the original activated sludge, and the treatment efficiency of a reactor is improved. The IFAS process is mainly characterized in fluidization and interception of suspended biological carriers, in the traditional technology, in order to ensure complete fluidization and effective interception of the biological carriers, a biochemical reaction tank and a secondary sedimentation tank are generally built in a horizontal combined mode, the occupied area is large, and a reactor built in a vertical combined mode is easy to cause accumulation of the biological carriers and influence the treatment effect because the secondary sedimentation tank is positioned at the upper part of the biochemical reaction tank and the structure of the reactor can influence the fluidization state of the biological carriers.
The HEBR bioreactor 100 of this embodiment has at least the following advantages:
(1) the HEBR bioreactor 100 is filled with suspended fillers or fixed fillers, which can be used as carriers for the growth of microorganisms, so as to realize the fixed growth of the microorganisms, and the aeration system 114 is used to effectively fluidize the biological fillers 112. Compared with the traditional bioreactor for realizing high biomass through high sludge concentration, the HEBR bioreactor 100 has the fixed growth microorganisms, so that the high biomass in the reactor is ensured, the sludge concentration of the reactor can be reduced, the solid load limitation of the filter material filler 128 can be effectively solved, the surface hydraulic load is improved, and the occupied area of the separation area 120 is effectively reduced.
(2) According to the HEBR bioreactor 100, the biochemical reaction region 110 and the separation region 120 are combined in a vertical combined type by optimizing the reactor structure, so that the problem that the secondary sedimentation tank of the traditional combined high-biomass reactor occupies a large area is solved, and in the embodiment, the separation region 120 occupies a small proportion of the biochemical reaction region 110, so that the daily operation and maintenance are facilitated.
(3) The lower part of the separation area 120 of the HEBR bioreactor 100 can be provided with an aeration system, and by optimizing the structure of the gas-liquid separation unit, the problem of gas mixing of the solid-liquid separation unit can be avoided while the sewage, the sludge and the filler in the biochemical reaction area are fully contacted, and the problem of sludge sedimentation and accumulation caused by non-aeration of the lower part of the traditional separation area is avoided.
(4) The HEBR bioreactor 100 can realize the gravity self-return of the sludge into the biochemical reaction area without power, and the running energy consumption is greatly reduced.
(5) The HEBR bioreactor 100 has the advantages of good denitrification and dephosphorization effect, high treatment efficiency, strong shock load resistance and simple operation and maintenance, and can realize convenient transportation and installation through systematic integrated design.
Referring to fig. 2, one embodiment of a wastewater treatment system 10 includes the HEBR bioreactor 100 described above. The sewage treatment system 10 further includes a grid adjusting tank 200, a vertical anoxic-anaerobic tank 300, a secondary sedimentation tank 400, an ultraviolet disinfection system 500, a sludge storage tank 600, and a sludge dewatering system 700.
Wherein, the grid in the grid adjusting tank 200 can remove coarse impurities in the raw water. The grill regulating reservoir 200 can regulate the quality and/or quantity of the sewage. The grill regulating tank 200 is communicated with the vertical type anoxic-anaerobic tank 300 so that the sewage treated by the grill regulating tank 200 enters the vertical type anoxic-anaerobic tank 300. Further, the grill regulating tank 200 is communicated with the vertical type anoxic-anaerobic tank 300 through a pipe, and the sewage treated by the grill regulating tank 200 is transferred to the vertical type anoxic-anaerobic tank 300 through a pipe by a lift pump.
Specifically, referring to fig. 3 and 4, a stirring system 310 is disposed in the vertical anoxic-anaerobic tank 300 to ensure uniform sewage concentration in the vertical direction of the vertical anoxic-anaerobic tank 300. In one embodiment, the stirring system 310 employs mechanical stirring or pneumatic stirring.
Wherein the mechanical stirring comprises paddle stirring, frame stirring or diving stirring. Specifically, when a paddle type stirring or frame type stirring mode is adopted, two or three layers of paddles or paddles can be arranged according to the effective water depth and the tank capacity. As shown in fig. 3, the stirring system 310 employs a mechanical stirring manner.
As shown in fig. 4, the stirring system 310 employs a pneumatic stirring manner. The pneumatic agitation requires an intermittent aeration mode to ensure the dissolved oxygen concentration in the vertical anoxic-anaerobic tank 300. Specifically, the aeration interval time and the aeration duration need to be adjusted and determined on site.
Preferably, the vertical anoxic-anaerobic tank 300 employs a mechanical agitation. In order to ensure the distribution of the functional areas in the vertical direction of the vertical anoxic-anaerobic tank 300, a frequency converter is required to be arranged on the mechanical stirring device to adjust the rotating speed.
The stirring system 310 is arranged in the vertical anoxic-anaerobic tank 300, so that the sewage concentration in the vertical direction in the tank can be uniform, and the transition from an anoxic zone to an anaerobic zone is formed along the vertical direction in the tank from top to bottom, the upper part of the vertical direction in the tank is in contact with air due to the closer proximity to the liquid level, oxygen is easily enriched in the stirring process, and the stirring process is suitable for the growth of anoxic bacteria, so that organic matters in the sewage and reflux nitrifying liquid generated in the HEBR bioreactor 100 are subjected to denitrification reaction in the anoxic zone, nitrate nitrogen in the reflux nitrifying liquid is removed, the adverse effect of the nitrate nitrogen on a subsequent anaerobic zone is eliminated, and the denitrification effect is achieved, while the lower part of the vertical direction in the tank is lower in the oxygen concentration and is suitable for the growth of anaerobic bacteria, so that the sewage anaerobically releases phosphorus, PHB (poly β phosphorus butyrate) is synthesized, then organic pollutants are decomposed into carbon dioxide and water by microorganisms in a biochemical reaction zone (namely an aerobic zone) of the HEBR bioreactor 100, the PHB is proliferated, and the phosphorus is absorbed by the aerobic bacteria, and the residual phosphorus in the aerobic zone, and the sludge in the aerobic zone is converted into the denitrification sludge in the anoxic biological reactor, and the denitrification reaction zone, and the denitrification effect of the denitrification reaction is achieved.
Specifically, the vertical anoxic-anaerobic tank 300 is communicated with the biochemical reaction area of the HEBR bioreactor 100, so that the sludge-water mixture treated by the vertical anoxic-anaerobic tank 300 flows into the HEBR bioreactor 100. As shown in fig. 3 and 4, a communicating pipe 320 is provided between the vertical anoxic-anaerobic tank 300 and the HEBR bioreactor 100. The sewage is treated by the vertical anoxic-anaerobic tank 300 and then enters the HEBR bioreactor 100 from the bottom of the vertical anoxic-anaerobic tank 300 through the communicating pipe 320.
Further, a nitrifying liquid reflux device 350 is arranged between the vertical anoxic-anaerobic tank 300 and the HEBR bioreactor 100. The nitrifying liquid reflux device 350 is communicated with the vertical anoxic-anaerobic tank 300 and the biochemical reaction area 110 of the HEBR bioreactor 100, and the nitrifying liquid reflux device 350 can enable the nitrifying liquid treated by the biochemical reaction area 110 to flow into the vertical anoxic-anaerobic tank 300.
In one embodiment, as shown in FIG. 3, the nitrating liquid reflux unit 350 is a stripping reflux unit. Specifically, the air stripping reflux apparatus includes a riser 354, an air inlet pipe 352, and a fan (not shown). One end of the lifting pipe 354 can extend into the water outlet of the upper filler intercepting net 116 of the biochemical reaction zone 110, and the other end of the lifting pipe 354 can extend into the mixing tank 330 of the vertical anoxic-anaerobic tank 300. One end of the air inlet pipe 352 is communicated with the riser pipe 354, and the other end of the air inlet pipe 352 is communicated with the fan so as to convey air into the air inlet pipe 352 through the fan. Air is conveyed into the air inlet pipe 352 by a fan by adopting an air stripping reflux device, so that the nitration liquid in the biochemical reaction area of the HEBR bioreactor 100 is conveyed into the mixing tank 330 of the vertical anoxic-anaerobic tank 300 by the lifting pipe 354 communicated with the air inlet pipe 352, and a nitration liquid reflux system is formed.
When the nitrified liquid reflux unit 350 is an air stripping reflux unit, air required by the nitrified liquid reflux unit 350 and air required by the aeration system of the HEBR bioreactor 100 may be provided by one or more fans.
In another embodiment, as shown in FIG. 4, the nitrified liquid reflux unit 350 includes a sewage pump 356 and a reflux line 358. In fig. 4, a sewage pump 356 is disposed at the water outlet of the upper packing intercepting net 116 of the biochemical reaction area 110 of the HEBR bioreactor 100, one end of a return pipe 358 is communicated with the sewage pump 356, and the other end can be inserted into the mixing tank 330 of the vertical anoxic-anaerobic tank 300, so that the nitrified liquid treated in the biochemical reaction area 110 flows back into the mixing tank 330 to be mixed with the sewage treated in the regulating tank. At this time, the nitrified liquid reflux device 350 adopts an internal reflux mode, and the sewage pump 356 is a submersible sewage pump. It is understood that in other embodiments, the nitrified liquid reflux device 350 can also adopt an external reflux mode, in which a sewage pump 356 is arranged outside the HEBR bioreactor 100, and the sewage pump 356 is a pipeline pump. The nitrified liquid is returned to the mixing tank 330 of the vertical anoxic-anaerobic tank 300 by a sewage pump 356 and a return pipe 358 in a power manner, thereby constituting a nitrified liquid return system.
In this embodiment, the vertical anoxic-anaerobic tank 300 may be designed in a circular or square structure as necessary.
Specifically, a mixing tank 330 is further arranged in the vertical anoxic-anaerobic tank 300, the mixing tank 330 is communicated with a nitrifying liquid reflux device 350, the mixing tank 330 is communicated with the grid regulating tank 200, the sewage treated by the regulating tank 200 can flow into the mixing tank 330, and the nitrifying liquid reflux device 350 can enable the nitrifying liquid treated by the biochemical reaction zone to flow back into the mixing tank 330 and be mixed with the sewage treated by the grid regulating tank 200. In the actual process, the mixing tank 330 is communicated with the grid regulating reservoir 200 through a pipeline, and the sewage treated by the grid regulating reservoir 200 is conveyed into the mixing tank 330 through the pipeline by a lift pump. The mixing tank 330 is arranged in the vertical anoxic-anaerobic tank 300, so that raw water and the return nitrification liquid in the HEBR bioreactor 100 can be ensured to be fully mixed and then enter the vertical anoxic-anaerobic tank 300. Specifically, the upper end of the mixing tank 330 is 20cm to 60cm higher than the liquid level, and the lower end of the mixing tank 330 is 30cm to 50cm lower than the liquid level.
In one embodiment, the sewage treated by the grid adjusting tank 200 is lifted by a lift pump to the water inlet pipe at the upper end of the vertical anoxic-anaerobic tank 300, and enters the mixing tank 330 through the water inlet pipe.
Specifically, the HEBR bioreactor 100 is the HEBR bioreactor 100 of the above embodiment, and is not described herein again.
The HEBR bioreactor 100 is communicated with the secondary sedimentation tank 400, and the sewage treated by the HEBR bioreactor 100 can flow into the secondary sedimentation tank 400. Specifically, the water collection tank 127 of the HEBR bioreactor 100 is in communication with the secondary sedimentation tank 400. In one embodiment, the water collection tank 127 is in communication with the secondary sedimentation tank 400 via a pipe. In this embodiment, the secondary sedimentation tank 400 may be at least one of a flocculation sedimentation tank, a cloth filter, a high-density sedimentation tank, an air flotation tank, and a sand filter. For example, the secondary sedimentation tank 400 is a flocculation sedimentation tank, the effluent of the water collection tank 127 flows into the secondary sedimentation tank 400, and a flocculating agent can be properly added according to the effluent quality of the water collection tank 127 of the HEBR bioreactor 100 to further remove pollutants such as total phosphorus, suspended matters and insoluble COD in the effluent, thereby ensuring that the effluent meets the discharge standard. Specifically, the flocculating agent is selected from at least one of ferric trichloride, polyaluminium chloride, polyacrylamide and polyferric sulfate. It is understood that the secondary sedimentation tank 400 can be omitted after the wastewater treated by the HEBR bioreactor 100 reaches the standard.
The secondary sedimentation tank 400 is communicated with the ultraviolet disinfection system 500 so that the sewage treated by the secondary sedimentation tank 400 flows into the ultraviolet disinfection system 500. The sewage treated by the ultraviolet disinfection system 500 can be discharged after reaching the standard. It is understood that the ultraviolet disinfection system 500 may be omitted after the wastewater treated by the secondary sedimentation tank 400 reaches the standard.
The HEBR bioreactor 100 is also in communication with a sludge reservoir 600 so that excess sludge from the HEBR bioreactor 100 is discharged to the sludge reservoir 600. The sludge storage tank 600 is communicated with the sludge dewatering system 700 so that the sludge in the sludge storage tank 600 is dewatered by the sludge dewatering system 700. The sludge treated by the sludge dewatering system 700 is transported to the outside.
Further, the sludge storage tank 600 is also communicated with the secondary sedimentation tank 400, so that the sludge settled in the secondary sedimentation tank 400 is conveyed to the sludge storage tank 600.
Experiments prove that after the sewage is treated by the sewage treatment system 10, the effluent can be superior to the first-class A standard of pollutant discharge Standard of urban sludge treatment plant (GB 18918-2002).
The above-described sewage treatment system 10 has at least the following advantages:
(1) the HEBR bioreactor 100 of the sewage treatment system 10 is filled with suspended fillers or fixed fillers, which can be used as carriers for the growth of microorganisms to realize the fixed growth of the microorganisms. Compared with the traditional bioreactor for realizing high biomass through high sludge concentration, the HEBR bioreactor 100 has the fixed growth microorganisms, so that the high biomass in the reactor is ensured, the concentration of suspended solids in mixed liquor of the reactor can be reduced, the solid load limitation of an inclined plate (pipe) sedimentation tank can be effectively solved, the surface hydraulic load is improved, and the floor area of a secondary sedimentation tank is effectively reduced.
(2) According to the HEBR bioreactor 100, the biochemical reaction region 110 and the separation region 120 are combined in a vertical combined type by optimizing the reactor structure, so that the problem that the secondary sedimentation tank of the traditional combined high-biomass reactor occupies a large area is solved, and in the embodiment, the separation region 120 occupies a small proportion of the biochemical reaction region 110, so that the daily operation and maintenance are facilitated.
(3) The stirring speed of the vertical anoxic-anaerobic tank 300 of the sewage treatment system 10 is reasonably adjusted to ensure that the vertical anoxic-anaerobic tank 300 is in transition from an anoxic zone to an anaerobic zone in the vertical direction from top to bottom, so that denitrification can firstly obtain a carbon source to further enhance the denitrification capability of the system, and in addition, phosphorus accumulating bacteria directly enter an aerobic environment after anaerobic phosphorus release to enhance the phosphorus absorption process in the HEBR bioreactor 100, so that the advantage of 'group effect' of the phosphorus accumulating bacteria can be exerted to enhance the phosphorus removal effect.
(4) The sewage treatment system 10 has the advantages of good denitrification and dephosphorization effect, high treatment efficiency, strong impact load resistance and simple operation and maintenance, and can realize convenient transportation and installation through systematic integrated design.
The sewage treatment method of an embodiment includes the steps of:
providing the wastewater treatment system of the above embodiment;
the sewage treatment system is adopted to treat sewage.
Specifically, the steps of treating the sewage by adopting the sewage treatment system comprise:
sequentially flowing the sewage into a grid adjusting tank, a vertical anoxic-anaerobic tank and an HEBR bioreactor to obtain supernatant and residual sludge treated by the HEBR bioreactor;
the supernatant fluid flows into a secondary sedimentation tank and an ultraviolet disinfection system in sequence and then is discharged after reaching the standard;
and discharging the residual sludge to a sludge storage tank, conveying the residual sludge to a sludge dewatering system by a diaphragm pump for dewatering to obtain treated sludge, and refluxing filtrate to a grid regulating tank.
The sewage treatment method utilizes the sewage treatment system to treat the sewage to obtain the clean water which can be discharged, and the sludge can be transported for treatment after being dried and dehydrated.
The following are specific examples:
example 1
The sewage treatment process of this embodiment is specifically as follows:
(1) and introducing the sewage into a grid adjusting tank for treatment so as to remove large-particle pollutants.
(2) The sewage treated by the adjusting tank is lifted to a vertical anoxic-anaerobic tank for treatment by a lifting pump, the concentration of the sewage in the vertical direction is uniform under the action of mechanical stirring (the rotating speed is 30r/min), the vertical anoxic-anaerobic tank is excessively an anoxic zone and an anaerobic zone from top to bottom, the sewage is subjected to denitrification reaction for denitrification, then anaerobic phosphorus release is carried out to synthesize PHB, and the sewage treated by the vertical anoxic-anaerobic tank flows into an HEBR bioreactor from a pipeline below.
(3) The biochemical reaction area is filled with suspended filler, and the filling ratio of the suspended filler is 50%. The PHB is aerobically decomposed, the phosphorus-accumulating bacteria proliferate and absorb phosphorus, and the purpose of removing phosphorus is achieved by discharging excess sludge. Effluent after the treatment of the biochemical reaction zone is subjected to steam stripping, and nitrifying liquid flows back to the vertical anoxic-anaerobic tank from a riser of a nitrifying liquid reflux device according to a certain proportion (160% -200%) to perform denitrification reaction; the mud-water mixture enters the separation zone through the liquid inlet under the action of the guide plate and flows upwards to enter the inclined plate filler under the action of the flow baffle plate, the sludge in the sewage is intercepted by the inclined plate filler and returns to the biochemical reaction zone through the sludge return joint by the sludge return plate, and the liquid enters the water collecting tank.
(4) And introducing the treatment liquid treated by the HEBR into a secondary sedimentation tank through a water outlet of the water collecting tank, and adding flocculating agents, namely polyaluminium chloride and polyacrylamide into the secondary sedimentation tank to reduce the contents of total phosphorus, suspended matters, insoluble COD (chemical oxygen demand) and the like. And (4) carrying out an ultraviolet disinfection system on the treatment liquid treated by the secondary sedimentation tank to obtain clear water which can reach the discharge standard.
(5) Pumping the solid recovered in the biochemical reaction zone into a sludge storage tank, drying the solid by a sludge dewatering system to obtain dried sludge, transporting the dried sludge outside for disposal, and refluxing the dewatered filtrate to a grid regulating tank.
Example 2
The sewage treatment process of this example is similar to that of example 1, except that:
in the step (2), a pneumatic stirring mode is adopted in the vertical anoxic-anaerobic tank, the aeration interval is 15min, and the aeration time is 1 min;
in the step (3), a fixed filler is filled in the biochemical reaction area, and the filling ratio is 50%; the nitrifying liquid reflux device comprises a sewage pump and a reflux pipe.
The water quality data of the wastewater influent and effluent of examples 1 and 2 are shown in tables 1 and 2, respectively.
TABLE 1 quality data of influent and effluent of wastewater from example 1
Table 2 influent and effluent quality data for the wastewater of example 2
As can be seen from the above tables 1 and 2, the clean water treated by the sewage treatment processes of the embodiments 1 and 2 reaches the first-class A standard and can be directly discharged.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (16)
1. The HEBR bioreactor is characterized by comprising a shell, wherein the shell can contain sewage and activated sludge, and a biochemical reaction area and a separation area are arranged in the shell;
a biological filler is arranged in the biochemical reaction zone, and an aeration system is also arranged in the biochemical reaction zone so as to fluidize the biological filler and uniformly mix the sewage and the activated sludge;
the separation zone is provided with a guide plate, an air guide plate and a sludge reflux plate, one end of the guide plate is connected with the air guide plate, a liquid inlet is formed between one end of the guide plate far away from the air guide plate and the top wall of the shell, one end of the air guide plate far away from the guide plate is separated from the sludge reflux plate to form a sludge reflux slit, one end of the sludge reflux plate far away from the air guide plate is abutted against the side wall of the shell, the separation zone is separated from the biochemical reaction zone by the guide plate, the separation zone is internally provided with a flow baffle plate, the flow baffle plate and the guide plate are oppositely arranged at an interval, one end of the flow baffle plate is higher than the liquid level in the shell, the other end of the flow baffle plate is arranged at an interval with the air guide plate, and a vertically combined water collecting tank and filter material filler are also arranged between the side wall of the shell and the flow baffle plate, the water collecting tank is in contact with the side wall of the shell and the flow baffle, and the filter material filler is in contact with the side wall of the shell and the flow baffle.
2. The HEBR bioreactor according to claim 1, wherein said biological filler is suspended filler or fixed filler, when said biological filler is suspended filler, an upper filler intercepting net and a lower filler intercepting net are further disposed in said biochemical reaction region, said upper filler intercepting net can shield said liquid inlet, said lower filler intercepting net can shield said sludge backflow slit, so that said biological filler is intercepted in said biochemical reaction region.
3. The HEBR bioreactor according to claim 2, wherein when the bio-packing is suspended packing, the packing ratio of the bio-packing is 5% to 60%; when the biological filler is a fixed filler, the filling ratio of the biological filler is 40-60%.
4. The HEBR bioreactor according to claim 1, wherein the angle between the deflector and the gas guide plate is between 130 ° and 160 °.
5. The HEBR bioreactor according to claim 1, wherein the angle between the gas guiding plate and the sludge recirculation plate is between 30 ° and 90 °.
6. The HEBR bioreactor according to claim 1, wherein the aeration system employs micro-perforated aeration discs, tubular aerators or perforated aerators.
7. The HEBR bioreactor of claim 1, wherein a water outlet is provided at the side of the water collection tank abutting against the side wall of the shell, so that supernatant obtained after the HEBR bioreactor is treated is discharged.
8. The HEBR bioreactor according to claim 1, wherein the filter media filler comprises at least one of a fiber ball soft filter media, an activated carbon modified sponge filter media, and a tube-chute filter media.
9. The HEBR bioreactor of any of claims 1-8, wherein said HEBR bioreactor is circular or square in shape.
10. A wastewater treatment system comprising the HEBR bioreactor according to any of claims 1 to 9.
11. The wastewater treatment system according to claim 10, further comprising a vertical anoxic-anaerobic tank, wherein a stirring system is disposed in the vertical anoxic-anaerobic tank, the vertical anoxic-anaerobic tank is communicated with the biochemical reaction zone of the HEBR bioreactor, so that wastewater treated by the vertical anoxic-anaerobic tank flows into the HEBR bioreactor, a nitrifying liquid reflux device is disposed between the vertical anoxic-anaerobic tank and the HEBR bioreactor, the nitrifying liquid reflux device is communicated with the vertical anoxic-anaerobic tank and the biochemical reaction zone of the HEBR bioreactor, and the nitrifying liquid reflux device can reflux nitrifying liquid treated by the biochemical reaction zone into the vertical anoxic-anaerobic tank.
12. The sewage treatment system of claim 11, further comprising a grid regulating tank, wherein a mixing tank is further disposed in the vertical anoxic-anaerobic tank, the sewage treated by the grid regulating tank can flow into the mixing tank, the mixing tank is further communicated with the nitrifying liquid reflux device, and the nitrifying liquid reflux device can make the nitrifying liquid obtained after the treatment of the biochemical reaction zone flow into the mixing tank and mix with the sewage treated by the grid regulating tank.
13. The wastewater treatment system according to claim 12, wherein the upper end of the mixing tank is 20-60 cm above the liquid level in the vertical anoxic-anaerobic tank, and the lower end of the mixing tank is 30-50 cm below the liquid level in the vertical anoxic-anaerobic tank.
14. The wastewater treatment system according to claim 10, further comprising a secondary sedimentation tank communicated with the water collection tank, and an ultraviolet disinfection system communicated with the secondary sedimentation tank, so that supernatant fluid flowing out of the water collection tank is sequentially treated by the secondary sedimentation tank and the ultraviolet disinfection system, and further comprising a sludge storage tank communicated with a biochemical reaction zone of the HEBR bioreactor and a sludge dewatering system communicated with the sludge storage tank, so that sludge returned to the biochemical reaction zone from the separation zone is conveyed to the sludge storage tank and dewatered by the sludge dewatering system.
15. A sewage treatment method is characterized by comprising the following steps:
providing the wastewater treatment system of claim 10; and
and treating sewage by adopting the sewage treatment system.
16. The wastewater treatment method according to claim 15, wherein the wastewater treatment system further comprises: grid equalizing basin, rectilinear lack-anaerobism pond, two heavy ponds, ultraviolet disinfection system, mud reservoir and sludge dewatering system, adopt sewage treatment system handles the step that sewage includes:
enabling the sewage to sequentially flow into the grid adjusting tank, the vertical anoxic-anaerobic tank and the HEBR bioreactor to obtain supernatant and residual sludge treated by the HEBR bioreactor;
enabling the supernatant to sequentially flow into the secondary sedimentation tank and the ultraviolet disinfection system and then discharging after reaching the standard;
and conveying the excess sludge to the sludge dewatering system through the sludge storage tank for dewatering to obtain treated sludge.
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