Aerobic biological fluidized bed sewage treatment equipment

Abstract

The utility model relates to sewage treatment equipment of an aerobic biological fluidized bed, which belongs to the technical field of sewage treatment and comprises the aerobic biological fluidized bed which is of a hollow tank body or cylindrical structure and is internally provided with a hydrophilic microbial carrier; a sieve tray is arranged at the bottom of the aerobic biological fluidized bed, and a flow stabilizing cylinder is arranged at the upper part of the aerobic biological fluidized bed; the flow stabilizing cylinder comprises a straight cylinder section and a big-end-down horn cylinder connected to the lower portion of the straight cylinder section. A settling chamber is formed by the guide cylinder and the outer wall of the horn-shaped cylinder; a sludge return channel is reserved between the bottommost end of the horn and the bed wall of the aerobic biological fluidized bed, and the size of the sludge return channel is smaller than the diameter of the hydrophilic microbial carrier; a gap is reserved between the guide cylinder and the steady flow cylinder, and an interception net is arranged in the gap; the reactor disclosed by the utility model has the characteristics of high volume load, small occupied area, large biomass, impact load resistance and no loss of filler carriers and microorganisms.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and specifically relates to an aerobic biological fluidized bed sewage treatment device. Background Art

[0002] With the continuous development of human society and the continuous improvement of industrial technology, the discharge of industrial and agricultural wastewater in my country is increasing, and land resources are becoming increasingly scarce. The existing biochemical sewage treatment process has low volumetric load, long residence time, low treatment efficiency, and large land area. The biological fluidized bed technology that emerged in the early 1970s is a new type of biofilm process. The biological fluidized bed is a technology that organically combines the advantages of ordinary activated sludge method and biofilm method, and introduces fluidization technology in the chemical industry to treat organic wastewater. The biological fluidized bed uses particulate fillers such as sand, activated carbon, coke, porous balls, etc. as microbial carriers, pumps air (or oxygen) and wastewater into the reactor at the same time, and puts the carrier in a fluidized state. The solid, liquid, and gas in the reactor are fully transferred and mixed, and the sewage is oxygenated and the carrier is fluidized at the same time. The biofilm that continues to grow on the surface of the carrier adsorbs, oxidizes and decomposes organic matter in the wastewater. The particles collide violently, and the surface of the biofilm is constantly renewed. The microorganisms are always in a vigorous growth stage, and the pollutants in the wastewater are efficiently biodegraded.

[0003] However, due to the unstable flow state of the gas-liquid-solid three-phase in the reactor, the biological fluidized bed technology causes the loss of fillers and microorganisms, which affects the biomass in the reactor and causes a decrease in the treatment load. At the same time, a sedimentation tank is required subsequently, and the sedimentation effect is poor, affecting the effluent quality. Summary of the invention

[0004] In order to overcome the problems existing in the background technology, the utility model provides an aerobic biological fluidized bed sewage treatment equipment, which has the characteristics of high volume load, small footprint, large biomass, resistance to impact load, and no loss of filler carriers and microorganisms.

[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] The aerobic biological fluidized bed sewage treatment equipment comprises an aerobic biological fluidized bed, which is a hollow trough or cylindrical structure, and is provided with a hydrophilic microbial carrier inside; a sieve plate is provided at the bottom of the aerobic biological fluidized bed, a flow stabilizing tube is provided at the top, and a flow guide tube is provided outside the flow stabilizing tube; the flow stabilizing tube comprises a straight tube section and a trumpet tube with a small top and a large bottom connected to the bottom of the straight tube section; a sedimentation chamber is formed between the trumpet tube and the flow guide tube; a sludge return channel is formed between the bottom end of the trumpet tube and the bed wall of the aerobic biological fluidized bed, and the size of the sludge return channel is smaller than the diameter of the hydrophilic microbial carrier; the bottom end of the flow guide tube does not exceed the bottom end of the trumpet tube, and the upper end is higher than the flow stabilizing tube; a gap is left between the flow guide tube and the flow stabilizing tube, and a retention net is provided between the gap.

[0007] Preferably, an aeration pipe is provided in the aerobic biological fluidized bed above the sieve plate; the aeration pipe is equipped with an aeration fan.

[0008] Preferably, the upper part of the aerobic biological fluidized bed is a velocity reduction zone with a gradually increasing diameter; the flow stabilizing tube, flow guide tube and sedimentation chamber are all arranged in the velocity reduction zone; the flow stabilizing tube and flow guide tube are concentric with the velocity reduction zone.

[0009] Preferably, the deceleration zone is provided with a water outlet weir, and the water outlet of the aerobic biological fluidized bed equipment is opened directly opposite to the water outlet weir.

[0010] Preferably, the sieve plate is a plate-like structure with through holes, and the diameter of the through holes is smaller than the diameter of the hydrophilic microorganism carrier.

[0011] Preferably, the aerobic biological fluidized bed sewage treatment equipment further comprises an inlet pool, an inlet pump and a water distributor; the water distributor is arranged in the aerobic biological fluidized bed and below the sieve plate; the inlet pump is connected between the inlet pool and the water distributor through an inlet pipe.

[0012] Preferably, a mud discharge pipe is provided at the bottom of the aerobic biological fluidized bed.

[0013] Beneficial effects of the utility model:

[0014] The utility model arranges a flow stabilizing tube and a flow guide tube on the upper part of the aerobic biological fluidized bed, arranges a retention net between the flow stabilizing tube and the flow guide tube, and arranges a trumpet tube at the lower part of the flow stabilizing tube. This can ensure the normal operation of the aerobic biological fluidized bed while avoiding the loss of hydrophilic microbial carriers and microorganisms attached to the carriers, ensure the stability of the microbial quantity in the aerobic biological fluidized bed, effectively avoid the problem of reduced treatment load due to the loss of carriers and microorganisms, and improve the sewage treatment efficiency.

[0015] The utility model sets the upper part of the aerobic biological fluidized bed as a speed reduction zone with a gradually increasing diameter, and sets the flow stabilizing tube and the flow guide tube in the speed reduction zone. The structure of the speed reduction zone with a gradually increasing diameter reduces the flow rate of sewage, makes it easier to intercept the hydrophilic microbial carrier, and the sludge generated in the sewage treatment process is gravity precipitated in the sedimentation chamber. The precipitated sludge returns to the biological fluidized bed through the sludge return channel, thereby increasing the biomass of the sludge fluidized bed. The supernatant in the sedimentation chamber flows out from the outlet 13 through the outlet weir.

[0016] The structural design of the flow stabilizing cylinder of the utility model forms a sedimentation chamber between the trumpet section of the flow stabilizing cylinder and the bed wall of the aerobic biological fluidized bed, which can effectively separate and clarify the treated muddy and water mixture, and reduce the solid content of the treated sewage. At the same time, the precipitated sludge returns to the biological fluidized bed from the sludge return channel at the bottom of the sedimentation chamber.

[0017] The utility model arranges a flow stabilizing tube and a flow guide tube on the upper part of the aerobic biological fluidized bed, and arranges the upper part into a structure with gradually increasing diameter; the area between the flow guide tube and the horn tube forms a hydrostatic gravity sedimentation chamber, and is provided with a water outlet weir, so that the mud-water mixture produced by the aerobic biological fluidized bed can be effectively precipitated and separated here, the sludge flows back to the fluidized bed layer, and the clean water flows out from the water outlet 13 evenly through the water outlet weir, so that the sludge produced in the treatment process of the aerobic biological fluidized bed can be effectively precipitated and flowed back, the microbial biomass and concentration of the biological fluidized bed are increased, the volume load is increased, and at the same time, the effluent does not need to be provided with a sedimentation tank separately, thus saving the floor space of the sewage treatment equipment and saving investment.

[0018] The sieve plate of the utility model can not only intercept the hydrophilic microorganism carrier, but also evenly distribute water and provide a discharge channel for the sludge.

[0019] The utility model has the characteristics of high volumetric load, small floor space, large biomass, resistance to impact load, good mass transfer effect, and no loss of filler carriers and microorganisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] In the figure, 1 is an inlet pool, 2 is an inlet pump, 3 is an aeration fan, 4 is a water distributor, 5 is a mud discharge pipe, 6 is a sieve plate, 7 is an aeration pipe, 8 is a hydrophilic microorganism carrier, 9 is a sedimentation chamber, 10 is an outlet weir, 11 is a flow stabilizing tube, 12 is a guide tube, 13 is an outlet, and 14 is a retention net. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to facilitate understanding by technicians.

[0023] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", etc. indicating the orientation or state relationship are based on the orientation or state relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.

[0025] like Figure 1 As shown, the aerobic biological fluidized bed sewage treatment equipment includes an aerobic biological fluidized bed, an inlet pool 1, an inlet pump 2 and a water distributor 4.

[0026] The aerobic biological fluidized bed is a hollow trough or a cylindrical structure, preferably a hollow cylindrical structure, the lower part of which is a straight cylinder and the upper part is a deceleration zone with a gradually increasing diameter. A sieve plate 6 is provided at the lower part of the straight cylinder section of the aerobic biological fluidized bed. A water distribution area is formed below the sieve plate 6, and a mud discharge pipe 5 is provided at the lower part of the water distribution area. The water distributor 4 is arranged in the water distribution area, and the water inlet pump 2 is connected between the water inlet pool 1 and the water distributor 4 through the water inlet pipe to send the sewage from the water inlet pool 1 into the water distributor 4. By setting the water distribution area and the water distributor 4, the impact force of the sewage entering the aerobic biological fluidized bed can be reduced, the impact load of the water inlet can be reduced, the hydrophilic microbial carrier 8 can be evenly dispersed in the aerobic biological fluidized bed, the mass transfer effect can be improved, and the sewage treatment efficiency can be improved.

[0027] The deceleration zone is provided with a flow stabilizing tube 11 and a flow guide tube 12 which are arranged concentrically therewith, and a water outlet weir 10. The upper section of the flow stabilizing tube 11 is a straight tube, and the lower section is a trumpet tube which is small at the top and large at the bottom. A sedimentation chamber 9 is formed between the trumpet section of the flow stabilizing tube 11 and the bed wall of the aerobic biological fluidized bed, and a gap is left between the bottom end of the trumpet tube and the bed wall of the aerobic biological fluidized bed to form a sludge return channel. The diameter of the flow guide tube 12 is larger than the diameter of the straight section of the flow stabilizing tube 11, the bottom end of the flow guide tube 12 does not exceed the bottom end of the trumpet tube, and the upper end is higher than the flow stabilizing tube 11 and higher than the sewage water level. The biological fluidized bed between the flow stabilizing cylinder 11 and the sieve plate 6 is provided with a hydrophilic microbial carrier 8, and a retention net 14 is provided between the guide cylinder 12 and the flow stabilizing cylinder 11. The size of the sludge reflow channel is smaller than the diameter of the hydrophilic microbial carrier 8 to prevent the hydrophilic microbial carrier 8 from being discharged, thereby ensuring that the hydrophilic microbial carrier 8 always remains in the aerobic biological fluidized bed, thereby avoiding the loss of the hydrophilic microbial carrier 8 and the microorganisms attached to the carrier 8, ensuring a higher microbial concentration in the aerobic biological fluidized bed, effectively avoiding the problem of reduced treatment load due to the loss of carriers and microorganisms, and maintaining a high sewage treatment efficiency.

[0028] The outlet weir 10 is higher than the bottom of the guide tube 12, and the outlet 13 of the aerobic biological fluidized bed is opened directly opposite the outlet weir 10. The sedimentation chamber 9 can effectively precipitate and separate the mud-water mixture produced by the aerobic biological fluidized bed, and the sludge returns to the fluidized bed layer, and the clean water flows out evenly from the outlet weir 10, so that the sludge produced in the aerobic biological fluidized bed treatment process is effectively precipitated and returned, thereby increasing the microbial biomass and concentration of the biological fluidized bed and the volume load. At the same time, the effluent does not need to set up a sedimentation tank separately, saving the floor space of the sewage treatment equipment and saving investment.

[0029] The sewage enters the aerobic biological fluidized bed through the water distribution area, and contacts and reacts with the microorganisms adsorbed on the hydrophilic microbial carrier 8. The mud-water mixture produced by the reaction is separated into mud and water in the sedimentation chamber 9. The sludge descends into the aerobic biological fluidized bed area through the sludge return channel to maintain a high microbial concentration. The aged microorganisms or dead mud produced in the biological fluidized bed area sink through the sieve plate 6 and are finally discharged through the sludge discharge pipe 5.

[0030] During the rising process of sewage, the hydrophilic microbial carrier 8 will be intercepted between the flow stabilizing tube 11 and the sieve plate 6. By setting the upper part of the aerobic biological fluidized bed as a speed reduction zone with a gradually increasing diameter, and setting the flow stabilizing tube 11 and the guide tube 12 in the speed reduction zone, the lower horn tube structure of the flow stabilizing tube 11 and the structure with a gradually increasing diameter of the speed reduction zone, the flow rate of the sewage is reduced, and the hydrophilic microbial carrier 8 is more easily intercepted. The sludge generated during the sewage treatment process is precipitated and separated in the sedimentation chamber 9 and then reflowed into the fluidized bed.

[0031] The sieve plate 6 is a circular plate with through holes, the aperture of which is smaller than the diameter of the hydrophilic microorganism carrier 8 . The sieve plate 6 intercepts the hydrophilic microorganism carrier 8 and provides a sinking channel for the sludge.

[0032] An aeration pipe 7 is arranged above the sieve plate 6 in the aerobic biological fluidized bed; the aeration pipe 7 is equipped with an aeration fan 3 .

[0033] In the aerobic biological fluidized bed of the utility model, the hydrophilic microbial carrier 8 is confined to the area between the sieve plate 6 and the flow stabilizing cylinder 11. The water inlet and aeration pipe 7 of the water distribution area drive the sewage to rise. During the rising process of the sewage, the hydrophilic microbial carrier 8 is intercepted below the flow stabilizing cylinder 11. The rising power of aeration drives the sewage and the hydrophilic microbial carrier 8 to circulate in the area between the flow stabilizing cylinder 11 and the sieve plate 6 to form a biological fluidized bed, so that the hydrophilic microbial carrier 8 is relatively evenly dispersed in the sewage, thereby strengthening the contact effect between the sewage and the microorganisms and improving the sewage treatment efficiency.

[0034] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. An aerobic biological fluidized bed sewage treatment equipment, characterized in that: It comprises an aerobic biological fluidized bed, which is a hollow trough or cylindrical structure, and is provided with a hydrophilic microorganism carrier inside; a sieve plate is provided at the bottom of the aerobic biological fluidized bed, a flow stabilizing tube is provided at the top, and a flow guide tube is provided outside the flow stabilizing tube; the flow stabilizing tube comprises a straight tube section and a trumpet tube which is small at the top and large at the bottom and connected below the straight tube section; a sedimentation chamber is formed between the trumpet tube and the flow guide tube; a sludge return channel is formed between the bottom end of the trumpet tube and the bed wall of the aerobic biological fluidized bed, and the size of the sludge return channel is smaller than the diameter of the hydrophilic microorganism carrier; the bottom end of the flow guide tube does not exceed the bottom end of the trumpet tube, and the upper end is higher than the flow stabilizing tube; a gap is left between the flow guide tube and the flow stabilizing tube, and a retention net is provided between the gap.

2. The aerobic biological fluidized bed sewage treatment equipment according to claim 1, characterized in that: An aeration pipe is arranged above the sieve plate in the aerobic biological fluidized bed; the aeration pipe is equipped with an aeration fan.

3. The aerobic biological fluidized bed sewage treatment equipment according to claim 1, characterized in that: The upper part of the aerobic biological fluidized bed is a speed reduction zone with a gradually increasing diameter; the flow stabilizing tube, flow guide tube and sedimentation chamber are all arranged in the speed reduction zone; the flow stabilizing tube and flow guide tube are concentric with the speed reduction zone.

4. The aerobic biological fluidized bed sewage treatment equipment according to claim 3, characterized in that: The deceleration zone is provided with a water outlet weir, which is higher than the bottom of the guide tube; the water outlet of the aerobic biological fluidized bed equipment is opened directly opposite to the water outlet weir.

5. The aerobic biological fluidized bed sewage treatment equipment according to claim 1, characterized in that: The sieve plate is a plate-like structure with through holes, and the aperture of the through holes is smaller than the diameter of the hydrophilic microorganism carrier.

6. The aerobic biological fluidized bed sewage treatment equipment according to claim 1, characterized in that: It also includes a water inlet pool, a water inlet pump and a water distributor; the water distributor is arranged in the aerobic biological fluidized bed and below the sieve plate; the water inlet pump is connected between the water inlet pool and the water distributor through a water inlet pipe.

7. The aerobic biological fluidized bed sewage treatment equipment according to claim 1, characterized in that: A mud discharge pipe is arranged at the bottom of the aerobic biological fluidized bed.

Images