CN110697997A - Suspension elastic filler reinforced A/O intermittent aeration sewage treatment device and method - Google Patents
Suspension elastic filler reinforced A/O intermittent aeration sewage treatment device and method Download PDFInfo
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- CN110697997A CN110697997A CN201911094260.9A CN201911094260A CN110697997A CN 110697997 A CN110697997 A CN 110697997A CN 201911094260 A CN201911094260 A CN 201911094260A CN 110697997 A CN110697997 A CN 110697997A
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- 238000005273 aeration Methods 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 77
- 239000010865 sewage Substances 0.000 title claims abstract description 77
- 239000000725 suspension Substances 0.000 title claims abstract description 22
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 66
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 66
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 20
- 238000005728 strengthening Methods 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 241000894006 Bacteria Species 0.000 claims description 57
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- 229910052760 oxygen Inorganic materials 0.000 claims description 16
- 239000001301 oxygen Substances 0.000 claims description 16
- 230000001546 nitrifying effect Effects 0.000 claims description 14
- 238000004659 sterilization and disinfection Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 9
- 238000004065 wastewater treatment Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000006396 nitration reaction Methods 0.000 claims description 4
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Images
Classifications
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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
- 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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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
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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
- C02F3/10—Packings; Fillings; Grids
- C02F3/105—Characterized by the chemical composition
- C02F3/108—Immobilising gels, polymers or the like
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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
- C02F3/10—Packings; Fillings; Grids
- C02F3/109—Characterized by the shape
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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
Abstract
The invention discloses a suspension elastic filler reinforced A/O intermittent aeration sewage treatment device and a method, relates to the technical field of sewage treatment, and solves a plurality of defects in the prior art. The invention relates to an intermittent aeration sewage treatment device with suspended elastic filler reinforced A/O, which comprises an anaerobic tank and an aerobic tank, wherein fillers are suspended in the anaerobic tank and the aerobic tank, and the aerobic tank adopts an intermittent aeration operation mode, so that the COD removal process and the phosphorus release process of the anaerobic tank are reinforced by the fillers, the nitrification reaction and the phosphorus absorption process of the aeration stage of the aerobic tank are reinforced by the fillers, and the COD removal process, the denitrification reaction and the phosphorus absorption process of the aeration stop stage of the aerobic tank are reinforced by the fillers. This hang elasticity filler reinforced AO's intermittent type aeration sewage treatment plant through improving traditional AO technology, hangs the filler in anaerobism pond and aerobic tank to aerobic tank adopts intermittent type aeration's operational mode, is favorable to strengthening getting rid of COD, TN and TP, reaches better sewage treatment effect.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an intermittent aeration sewage treatment device and method for strengthening A/O by using suspended elastic fillers.
Background
With the rapid development of industrial technology in China, the problem of water pollution is more and more severe, and the discharge standard of urban sewage treatment is more and more strict. The removal of nitrogen and phosphorus in domestic sewage is the central importance of water treatment in sewage plants. The existing sewage treatment technology mainly comprises the following steps: anaerobic-aerobic (A/O), anaerobic-anoxic-aerobic (A2/O), sequencing batch activated Sludge (SBR), oxidation ditch, Circulating Activated Sludge (CAST), UCT, MSBR, etc.
In sewage plants in China at present, although A/O and some new processes developed on the basis of A/O can obtain better denitrification and dephosphorization effects, the applicant finds that the existing processes still have the defects of large internal reflux ratio, low value-added speed and concentration of nitrifying bacteria, weak impact load resistance, large power consumption of nitrifying liquid reflux and the like.
Disclosure of Invention
The invention aims to provide a suspension elastic filler reinforced A/O intermittent aeration sewage treatment device and a suspension elastic filler reinforced A/O intermittent aeration sewage treatment method, in particular to a suspension elastic filler reinforced A/O synchronous nitrification and denitrification dephosphorization intermittent aeration sewage treatment device and a suspension elastic filler reinforced A/O synchronous nitrification and denitrification dephosphorization intermittent aeration sewage treatment method. The intermittent aeration sewage treatment device and method for reinforcing A/O by using the suspended elastic filler solve the technical problems that the sewage treatment method in the prior art has large internal reflux, slow value-added speed of nitrobacteria, low concentration, weak impact load resistance and large power consumption for nitrifying liquid reflux. The various technical effects that can be produced by the preferred technical solution of the present invention are described in detail below.
In order to achieve the purpose, the invention provides the following technical scheme:
the suspended elastic filler reinforced A/O intermittent aeration sewage treatment device comprises an anaerobic tank and an aerobic tank, wherein fillers are suspended in the anaerobic tank and the aerobic tank, the aerobic tank adopts an intermittent aeration operation mode, so that the COD (chemical oxygen demand) removal process and the phosphorus release process of the anaerobic tank are reinforced by the fillers, the nitrification reaction and the phosphorus absorption process of the aeration stage of the aerobic tank are reinforced by the fillers, and the COD removal process, the denitrification reaction and the phosphorus absorption process of the aeration stop stage of the aerobic tank are reinforced by the fillers.
According to a preferred embodiment, the filler is an elastic filler, and the filling rate of the elastic filler is 50 to 80%.
According to a preferred embodiment, the filler comprises a filler filament and a central rope, wherein the filler filament is arranged on the central rope and is radially arranged in a three-dimensional uniform manner.
According to a preferred embodiment, the diameter of the filler filament is 0.3 to 0.5mm, the diameter of the filler is 100 to 200mm, and the specific surface area is 50 to 100m2/m3Porosity of>99 percent and the weight of the biofilm is 80 to 120kg/m3。
According to a preferred embodiment, the aeration/stop ratio of the aerobic tank is 2: 1-1: 1, the concentration range of the dissolved oxygen in the aeration stage of the aerobic tank is 2.0-3.0 mg/L, and the concentration range of the dissolved oxygen in the aeration stop stage is 0.3-0.8 mg/L.
According to a preferred embodiment, one operating cycle of the aerobic tank is 90min and the aeration time/aeration stop time is 45min/45 min.
According to a preferred embodiment, a flow impeller is arranged in the anaerobic tank and/or the aerobic tank so as to stir the materials in the anaerobic tank and/or the materials in the aerobic tank through the flow impeller.
According to a preferred embodiment, the intermittent aeration sewage treatment device with suspended elastic filler for reinforcing A/O further comprises a pretreatment unit, wherein the pretreatment unit comprises a coarse grating, a fine grating and a grit chamber, so that suspended matters in sewage raw water are removed through the coarse grating, the fine grating and the grit chamber.
According to a preferred embodiment, the intermittent aeration sewage treatment device with suspended elastic filler reinforced a/O further comprises a secondary sedimentation tank, a disinfection tank and a dewatering machine room, wherein the secondary sedimentation tank is used for performing sludge-water separation on the effluent of the aerobic tank, returning a generated sludge part to the anaerobic tank, and the flow rate of the sludge part returned to the anaerobic tank through the secondary sedimentation tank is 1: 1 of the flow rate of the sludge part returned to the anaerobic tank after being treated by the pretreatment unit, the disinfection tank is used for performing disinfection treatment on the effluent of the secondary sedimentation tank, and the dewatering machine room is used for performing dewatering treatment on the residual sludge.
The invention relates to a suspension elastic filler reinforced A/O intermittent aeration sewage treatment method, which utilizes the suspension elastic filler reinforced A/O intermittent aeration sewage treatment device of any technical scheme of the invention to carry out sewage treatment and at least comprises the following steps:
pretreatment: the sewage raw water sequentially passes through a coarse grating, a fine grating and a grit chamber of the pretreatment unit so as to remove suspended matters in the sewage raw water through the coarse grating, the fine grating and the grit chamber;
deep treatment: the effluent of the pretreatment unit enters an anaerobic tank, the anaerobic tank carries out COD removal and phosphorus release processes through the strengthening action of phosphorus accumulating bacteria, denitrifying phosphorus accumulating bacteria and filler,
the effluent of the anaerobic tank enters an aerobic tank, the aerobic tank performs nitration reaction and phosphorus absorption processes through the strengthening action of nitrifying bacteria, phosphorus accumulating bacteria and filler in an aeration stage, and the aerobic tank performs COD removal, denitrification reaction and phosphorus absorption processes through the strengthening action of denitrifying bacteria, denitrifying phosphorus accumulating bacteria and filler in an aeration stop stage;
and (3) post-treatment: and the effluent of the aerobic tank enters a secondary sedimentation tank for mud-water separation, part of the generated sludge flows back to the anaerobic tank, the residual sludge is dewatered by a dewatering machine room and then transported out, and the effluent of the secondary sedimentation tank is sterilized by a sterilizing tank and then discharged.
The suspension elastic filler reinforced A/O intermittent aeration sewage treatment device and the method provided by the invention at least have the following beneficial technical effects:
according to the intermittent aeration sewage treatment device and method for reinforcing A/O by using the suspended elastic filler, the traditional A/O process is improved, the filler is suspended in the anaerobic tank and the aerobic tank, and the aerobic tank adopts an intermittent aeration operation mode, so that removal of COD (chemical oxygen demand), TN (total nitrogen) and TP (total phosphorus) is enhanced, and a better sewage treatment effect is achieved.
Specifically, the anaerobic pool carries out COD removal and phosphorus release processes through the strengthening action of phosphorus accumulating bacteria, denitrifying phosphorus accumulating bacteria and filler; in the aeration stage of the aerobic tank, nitrification reaction and phosphorus absorption processes are carried out through the strengthening action of nitrifying bacteria, phosphorus accumulating bacteria and fillers; and in the aeration stopping stage, COD removal, denitrification reaction and phosphorus absorption processes are carried out through the strengthening action of denitrifying bacteria, denitrifying phosphorus accumulating bacteria and the filler. The suspended elastic filler reinforced A/O intermittent aeration sewage treatment device and method provided by the invention are characterized in that the traditional A/O process is modified, intermittent aeration is carried out in an aerobic pool, and the reinforced synchronous nitrification and denitrification dephosphorization is realized through the combined action of nitrifying bacteria, denitrifying bacteria and denitrifying phosphorus-accumulating bacteria.
Furthermore, the aerobic tank adopts an intermittent aeration operation mode, so that favorable conditions are created for realizing the alternate operation of aerobic/anoxic, the concentration of nitrate nitrogen and dissolved oxygen in the returned sludge is reduced by the synchronous nitrification and denitrification dephosphorization of the aerobic tank, and the phosphorus release action of phosphorus accumulating bacteria and denitrifying phosphorus accumulating bacteria is facilitated, so that the phosphorus accumulating bacteria and the denitrifying phosphorus accumulating bacteria can grow preferentially. Intermittent aeration is carried out in the aerobic tank, and synchronous nitrification and denitrification dephosphorization is realized through the combined action of nitrifying bacteria, denitrifying bacteria and denitrifying phosphorus-accumulating bacteria; activated sludge forms a biological film on the suspended filler, and in the aeration stage of the aerobic tank, the dissolved oxygen concentration gradient is generated in the micro environment of the biological film due to the limitation of the dissolved oxygen diffusion, so that the synchronous nitrification and denitrification are realized in the formed aerobic zone and the anoxic zone.
On the other hand, because the fillers are added in the anaerobic tank and the aerobic tank, and the aerobic tank adopts an intermittent aeration operation mode, the yield of the excess sludge is reduced, the high-load impact resistance of the system is improved, and the sewage treatment effect is obviously improved. Compared with the A2/O process, the suspension elastic filler reinforced A/O intermittent aeration sewage treatment device and method do not need a nitrification liquid reflux pool and an anoxic pool, reduce the investment of reflux pump equipment and capital construction, and have better cost-reducing gain effect and popularization and use value.
The suspension elastic filler reinforced A/O intermittent aeration sewage treatment device and method can solve the technical problems that the sewage treatment method in the prior art has large internal reflux, slow value-added speed of nitrobacteria, low concentration, weak impact load resistance and large power consumption for nitrifying liquid reflux.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a preferred embodiment of the suspended elastic filler reinforced A/O intermittent aeration wastewater treatment method of the present invention;
FIG. 2 is a schematic front view of a preferred embodiment of the elastomeric filler of the present invention;
FIG. 3 is a schematic side view of a preferred embodiment of the elastomeric filler of the present invention;
FIG. 4 is a schematic diagram of the distribution of a preferred embodiment of suspended elastomeric fillers in an anaerobic pond of the present invention;
FIG. 5 is a schematic distribution diagram of a preferred embodiment of the suspended elastic filler in the aerobic tank according to the invention;
FIG. 6 is a flow chart of still another preferred embodiment of the suspended elastic filler reinforced A/O intermittent aeration wastewater treatment method of the present invention.
In the figure: 1-coarse grating; 2-fine grating; 3-a grit chamber; 4-a regulating tank; 5-an anaerobic tank; 6-an aerobic tank; 7-a secondary sedimentation tank; 8-a disinfection tank; 9-sludge adjusting tank; 10-a dehydration machine room; 11-a filler; 12-an aeration disc; 11 a-a strand of filler; 11 b-a central rope; 11 c-scaffold.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The suspended elastic filler reinforced A/O intermittent aeration sewage treatment apparatus and method of the present invention will be described in detail with reference to the accompanying drawings 1 to 6 and examples 1 to 3 of the specification.
Example 1
As shown in figure 1 or 6, the suspension elastic filler reinforced A/O intermittent aeration sewage treatment device comprises an anaerobic tank 5 and an aerobic tank 6, wherein fillers 11 are suspended in the anaerobic tank 5 and the aerobic tank 6, and the aerobic tank 6 adopts an intermittent aeration operation mode, so that the COD removal process and the phosphorus release process of the anaerobic tank 5 are reinforced by the fillers 11, the nitrification reaction and the phosphorus absorption process of the aeration stage of the aerobic tank 6 are reinforced by the fillers 11, and the COD removal process, the denitrification reaction and the phosphorus absorption process of the aeration stop stage of the aerobic tank 6 are reinforced by the fillers 11.
According to the suspension elastic filler reinforced A/O intermittent aeration sewage treatment device and method, the traditional A/O process is improved, the fillers 11 are suspended in the anaerobic tank 5 and the aerobic tank 6, and the aerobic tank 6 adopts an intermittent aeration operation mode, so that removal of COD, TN and TP is facilitated, and a better sewage treatment effect is achieved.
Specifically, the anaerobic tank 5 carries out COD removal and phosphorus release processes through the strengthening action of phosphorus accumulating bacteria, denitrifying phosphorus accumulating bacteria and the filler 11; in the aeration stage of the aerobic tank 6, nitrification reaction and phosphorus absorption processes are carried out through the strengthening action of nitrifying bacteria, phosphorus accumulating bacteria and the filler 11; and in the aeration stopping stage, COD removal, denitrification reaction and phosphorus absorption processes are carried out through the strengthening action of denitrifying bacteria, denitrifying phosphorus accumulating bacteria and the filler 11. The suspended elastic filler reinforced A/O intermittent aeration sewage treatment device and method provided by the invention are characterized in that the traditional A/O process is modified, intermittent aeration is carried out in the aerobic tank 6, and the reinforced synchronous nitrification and denitrification dephosphorization is realized through the combined action of nitrifying bacteria, denitrifying bacteria and denitrifying phosphorus-accumulating bacteria.
Furthermore, the aerobic tank 6 of the embodiment adopts an intermittent aeration operation mode, so that favorable conditions are created for realizing the alternate operation of aerobic/anoxic, the synchronous nitrification and denitrification dephosphorization of the aerobic tank 6 reduces the concentration of nitrate nitrogen and dissolved oxygen in the returned sludge, and is beneficial to the phosphorus release of phosphorus accumulating bacteria and denitrifying phosphorus accumulating bacteria, so that the phosphorus accumulating bacteria and the denitrifying phosphorus accumulating bacteria can grow favorably. Intermittent aeration is carried out in the aerobic tank 6, and synchronous nitrification and denitrification dephosphorization is realized through the combined action of nitrifying bacteria, denitrifying bacteria and denitrifying phosphorus-accumulating bacteria; activated sludge forms a biological film on the suspended filler 11, and in the aeration stage of the aerobic tank 6, the dissolved oxygen concentration gradient is generated in the micro environment of the biological film due to the diffusion limitation of the dissolved oxygen, so that the synchronous nitrification and denitrification are realized in the formed aerobic zone and the anoxic zone.
On the other hand, because the filler 11 is added in the anaerobic tank 5 and the aerobic tank 6, and the aerobic tank 6 adopts an intermittent aeration operation mode, the yield of the excess sludge is reduced, the high load impact resistance of the system is improved, and the sewage treatment effect is obviously improved. Compared with the A2/O process, the suspension elastic filler reinforced A/O intermittent aeration sewage treatment device and method do not need a nitrification liquid reflux pool and an anoxic pool, reduce the investment of reflux pump equipment and capital construction, and have better cost-reducing gain effect and popularization and use value.
According to a preferred embodiment, the filler 11 is an elastomeric filler and the filling rate of the elastomeric filler is 50 to 80%. Fig. 4 and 5 show the distribution of the filling material 11 in the anaerobic tank 5 and the aerobic tank 6 respectively, and as shown in fig. 4 or 5, the filling rate of the filling material 11 in the anaerobic tank 5 and the aerobic tank 6 is 50%. Preferably, the elastic filler is suspended below the liquid level so as to strengthen the removal of COD, TN and TP by the elastic filler and achieve better sewage treatment effect. Referring again to fig. 5, an aeration tray 12 is also provided in the aerobic tank 6.
As shown in fig. 2 or 3, the packing 11 includes a packing filament 11a and a center cord 11 b. The filler yarn 11a is provided on the center cord 11b, and the filler yarn 11a is arranged in a three-dimensional, uniform, and radial pattern as shown in fig. 4 or 5. Referring again to fig. 2 or 3, the packing 11 further includes a support frame 11 c. Preferably, the center cord 11b is provided on the support frame 11 c. Preferably, the diameter of the filler filament 11a is 0.3 to 0.5mm, the diameter of the filler 11 is 100 to 200mm, and the specific surface area is 50 to 100m2/m3Porosity of>99 percent and the weight of the biofilm is 80 to 120kg/m3. Preferably, the material of the filler yarn 11a and the center cord 11b is polyolefin, and more preferably polyamide.
The filling rate of the filler 11 in the preferred technical scheme of the embodiment is 50% -80%, the filler filaments 11a are in a three-dimensional uniformly-arranged radiation state, so that a biological membrane can be uniformly implanted, and the biomass in unit volume in the tank is higher than that in an activated sludge biochemical tank, so that the anaerobic tank 5 and the aerobic tank 6 have higher volume load, strong impact load resistance and good and stable effluent quality.
According to a preferred embodiment, the aeration/stop ratio of the aerobic tank 6 is 2: 1 to 1: 1, the concentration range of the dissolved oxygen in the aeration stage of the aerobic tank 6 is 2.0 to 3.0mg/L, and the concentration range of the dissolved oxygen in the aeration stop stage is 0.3 to 0.8 mg/L. Preferably, one operation period of the aerobic tank 6 is 90min, and the aeration time/aeration stop time is 45min/45 min.
According to a preferred embodiment, a flow impeller is arranged in the anaerobic tank 5 and/or the aerobic tank 6, so that the material in the anaerobic tank 5 and/or the material in the aerobic tank 6 can be stirred by the flow impeller. Preferably, the aerobic tank 6 is used for stirring the materials in the tank through the impeller in the aeration stopping period.
According to a preferred embodiment, the suspended elastic filler reinforced A/O intermittent aeration sewage treatment device further comprises a pretreatment unit, as shown in FIG. 1. The pretreatment unit is used for removing suspended matters in the sewage raw water. Preferably, the pretreatment unit includes a coarse grill 1, a fine grill 2, and a grit chamber 3, as shown in fig. 6, to remove suspended substances in the raw sewage through the coarse grill 1, the fine grill 2, and the grit chamber 3. In the preferred technical solution of this embodiment, the suspended matter refers to solid matter suspended in water, including inorganic matter, organic matter, silt, clay, microorganism, etc. which are insoluble in water. Suspended matters in the raw sewage are removed in advance through the interception function of the coarse grating 1 and the fine grating 2 and the precipitation function of the grit chamber 3, the treatment load of the subsequent anaerobic tank 5 and the subsequent aerobic tank 6 is reduced, and the sewage treatment efficiency is improved.
According to a preferred embodiment, the suspension elastic filler reinforced A/O intermittent aeration sewage treatment device further comprises a secondary sedimentation tank 7, a disinfection tank 8 and a dewatering machine room 10, as shown in figure 1 or 6. Wherein, the secondary sedimentation tank 7 is used for carrying out mud-water separation on the effluent of the aerobic tank 6 and returning part of the generated sludge to the anaerobic tank 5. The disinfection tank 8 is used for disinfecting the effluent of the secondary sedimentation tank 7. Preferably, the disinfection tank 8 is used for carrying out ultraviolet disinfection treatment on the outlet water of the secondary sedimentation tank 7. The dewatering machine room 10 is used for dewatering excess sludge. Preferably, the flow rate of the wastewater which flows back to the anaerobic tank 5 through the secondary sedimentation tank 7 is 1: 1 with the flow rate of the wastewater which enters the anaerobic tank 5 after being treated by the pretreatment unit.
Example 2
The suspended elastic filler reinforced A/O intermittent aeration sewage treatment method of the embodiment is to perform sewage treatment by using the suspended elastic filler reinforced A/O intermittent aeration sewage treatment device of the technical scheme of the embodiment 1. Preferably, the suspended elastic filler reinforced A/O intermittent aeration sewage treatment method of the embodiment is an intermittent aeration sewage treatment method for reinforcing A/O synchronous nitrification and denitrification dephosphorization by suspended filler 11.
According to a preferred embodiment, the suspended elastic filler reinforced A/O intermittent aeration sewage treatment method at least comprises the following steps:
(1) pretreatment: the sewage raw water sequentially passes through the coarse grating 1, the fine grating 2 and the grit chamber 3 of the pretreatment unit so as to remove suspended matters in the sewage raw water through the coarse grating 1, the fine grating 2 and the grit chamber 3.
(2) Deep treatment: the effluent of the pretreatment unit enters an anaerobic tank 5, and the anaerobic tank 5 performs COD removal and phosphorus release processes through the strengthening action of phosphorus accumulating bacteria, denitrifying phosphorus accumulating bacteria and a filler 11.
The effluent of the anaerobic tank 5 enters an aerobic tank 6, the aerobic tank 6 performs nitration reaction and phosphorus absorption processes through the strengthening action of nitrifying bacteria, phosphorus accumulating bacteria and the filler 11 in the aeration stage, and the aerobic tank 6 performs COD removal, denitrification reaction and phosphorus absorption processes through the strengthening action of denitrifying bacteria, denitrifying phosphorus accumulating bacteria and the filler 11 in the aeration stop stage.
(3) And (3) post-treatment: the effluent of the aerobic tank 6 enters a secondary sedimentation tank 7 for mud-water separation, part of the generated sludge flows back to the anaerobic tank 5, the residual sludge is transported outside after being dehydrated by a dehydration machine room 10, and the effluent of the secondary sedimentation tank 7 is discharged after being sterilized by a sterilization tank 8.
The suspended elastic filler reinforced A/O intermittent aeration sewage treatment method improves the traditional A/O process, adds the suspended fillers 11 in the anaerobic tank 5 and the aerobic tank 6, and adopts an intermittent aeration operation mode in the aerobic tank 6, so that removal of COD, TN and TP is facilitated, and a better sewage treatment effect is achieved.
Example 3
The suspension elastic filler reinforced A/O intermittent aeration sewage treatment method of the invention is explained in detail by taking a sewage treatment plant in a small town in south as an example. The scale of the sewage treatment plant is 1500 tons/day, and the average water quality of the inlet water is as follows: COD 161.7mg/L, NH326.3mg/L of N, 38.6mg/L of TN and 4.6mg/L of TP, and the sewage treatment plant is operated by the suspension elastic filler reinforced A/O intermittent aeration sewage treatment method of the invention, and the process flow is shown in figure 6.
The sewage raw water sequentially passes through the coarse grating 1 and the fine grating 2 of the pretreatment unit and then automatically flows into the grit chamber 3, and sand is removed under the action of gravity. The effluent of the grit chamber 3 automatically flows to a lifting pump station, is pumped to an adjusting tank 4 by a pump, is subjected to pH adjustment and water distribution, and is pumped to a combined A/O biochemical section by the pump. The combined A/O biochemical section comprises an anaerobic tank 5 and an aerobic tank 6. And the effluent subjected to advanced treatment in the combined A/O biochemical section enters a secondary sedimentation tank 7 for sludge-water separation, part of sludge flows back to the anaerobic tank 5, the rest sludge enters a sludge regulating tank 9 and is then dewatered by a dewatering machine room 10 and transported outside, and the supernatant is disinfected by a disinfection tank 8 and then discharged into a receiving water body.
Preferably, the anaerobic pool 5 is designed to be 2.8m × 4.5m × 6.0m (effective water depth 5.0m), and HRT is 2.0 h; the aerobic pool 6 is designed to be 11.8m multiplied by 4.5m multiplied by 6.0m (effective water depth 5.0m), and the HRT is 8.5 h. The sludge load is 0.092kgBOD5And (kgMLSS. d), maintaining the sludge concentration (MLSS) at 3000-4000 mg/L.
Preferably, the elastic filler is suspended in the anaerobic tank 5, the tank is stirred by a flow impeller, pretreated effluent and return sludge of the secondary sedimentation tank 7 synchronously enter the anaerobic tank 5, and the anaerobic tank 5 performs COD removal and phosphorus release processes through the reinforcement action of phosphorus accumulating bacteria, denitrifying phosphorus accumulating bacteria and the elastic filler.
Preferably, the aerobic tank 6 is suspended with elastic filler, the aeration period is controlled by an automatic control system, and the tank is internally provided with a flow impeller for stirring in the aeration stopping period. The aerobic tank 6 takes every 90min as an operation period, and the aeration time/aeration stop time is 45min/45 min. Wherein the concentration range of the dissolved oxygen in the aeration stage is 2.0-3.0 mg/L, and the concentration range of the dissolved oxygen in the aeration stop stage is 0.3-0.8 mg/L.
In the aeration stage, the aerobic tank 6 carries out nitration reaction and phosphorus absorption processes through the strengthening action of nitrifying bacteria, phosphorus accumulating bacteria and elastic fillers; in the aeration stop stage, the aerobic tank 6 carries out COD removal, denitrification reaction and phosphorus absorption processes through the strengthening action of denitrifying bacteria, denitrifying phosphorus accumulating bacteria and elastic filler. Realizes synchronous nitrification and denitrification dephosphorization in the aerobic tank 6.
By the treatment method, the average water quality of the effluent is as follows: COD 30.1mg/L, NH 3-N2.1 mg/L, TN 8.7mg/L, TP 0.35 mg/L. Therefore, after the treatment by the treatment method, the water quality condition can be obviously improved, and the effluent quality can stably reach the first-class A standard of pollutant discharge Standard of municipal wastewater treatment plant (GB 18918-2002).
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. An intermittent aeration sewage treatment device with suspended elastic filler for strengthening A/O is characterized by comprising an anaerobic tank (5) and an aerobic tank (6), wherein fillers (11) are suspended in the anaerobic tank (5) and the aerobic tank (6), and the aerobic tank (6) adopts an intermittent aeration operation mode,
to enhance the COD removal process and the phosphorus release process of the anaerobic tank (5) by the filler (11),
the nitrification reaction and the phosphorus absorption process of the aeration stage of the aerobic tank (6) are enhanced by the filler (11), and the COD removal process, the denitrification reaction and the phosphorus absorption process of the aeration stop stage of the aerobic tank (6) are enhanced by the filler (11).
2. The intermittent aeration sewage treatment device of claim 1, wherein the filler (11) is an elastic filler, and the filling rate of the elastic filler is 50-80%.
3. An intermittent aeration wastewater treatment device for A/O reinforced by suspended elastic fillers according to claim 2, characterized in that the fillers (11) comprise a filler filament (11a) and a central rope (11b), wherein the filler filament (11a) is arranged on the central rope (11b), and the filler filament (11a) is arranged in a three-dimensional uniform radial arrangement.
4. A suspended elastic filler reinforced A/O intermittent aeration wastewater treatment apparatus according to claim 3, wherein the diameter of the filler filament (11a) is 0.3 to 0.5mm, and the diameter of the filler (11) is 100 to 200mm, and the specific surface area is 50 to 100m2/m3Porosity of>99 percent and the weight of the biofilm is 80 to 120kg/m3。
5. The intermittent aeration sewage treatment device with suspended elastic filler for reinforcing A/O according to claim 1, wherein the aeration/stop ratio of the aerobic tank (6) is 2: 1-1: 1, the concentration range of the dissolved oxygen in the aeration stage of the aerobic tank (6) is 2.0-3.0 mg/L, and the concentration range of the dissolved oxygen in the aeration stop stage is 0.3-0.8 mg/L.
6. An intermittent aeration sewage treatment plant of suspension elastic filler reinforced A/O according to claim 5, characterized in that one operation period of the aerobic tank (6) is 90min and aeration time/aeration off time is 45min/45 min.
7. An intermittent aeration sewage treatment plant of suspension elastic filler reinforced A/O according to claim 1, characterized in that a flow impeller is arranged in the anaerobic tank (5) and/or the aerobic tank (6) to stir the materials in the anaerobic tank (5) and/or the aerobic tank (6) by the flow impeller.
8. An intermittent aeration sewage treatment plant of suspension elastic filler reinforced A/O according to claim 1, characterized by further comprising a pretreatment unit including a coarse grid (1), a fine grid (2) and a grit chamber (3) to remove suspended matters in sewage raw water through the coarse grid (1), the fine grid (2) and the grit chamber (3).
9. An intermittent aeration sewage treatment plant of suspension elastic filler reinforced A/O according to claim 8, further comprising a secondary sedimentation tank (7), a disinfection tank (8) and a dewatering machine room (10), wherein,
the secondary sedimentation tank (7) is used for carrying out mud-water separation on the effluent of the aerobic tank (6), partially reflowing the generated sludge to the anaerobic tank (5), and the flow rate of the sludge reflowing to the anaerobic tank (5) through the secondary sedimentation tank (7) is 1: 1 with the flow rate of the sludge entering the anaerobic tank (5) after being treated by the pretreatment unit,
the disinfection tank (8) is used for disinfecting the effluent of the secondary sedimentation tank (7),
the dehydration machine room (10) is used for dehydrating the excess sludge.
10. A suspended elastic filler reinforced a/O intermittent aeration wastewater treatment method characterized in that it utilizes the suspended elastic filler reinforced a/O intermittent aeration wastewater treatment apparatus according to any one of claims 1 to 9 for wastewater treatment, and the method comprises at least the following steps:
pretreatment: the sewage raw water sequentially passes through a coarse grating (1), a fine grating (2) and a grit chamber (3) of a pretreatment unit, so that suspended matters in the sewage raw water are removed through the coarse grating (1), the fine grating (2) and the grit chamber (3);
deep treatment: the effluent of the pretreatment unit enters an anaerobic tank (5), the anaerobic tank (5) carries out COD removal and phosphorus release processes through the strengthening action of phosphorus accumulating bacteria, denitrifying phosphorus accumulating bacteria and a filler (11),
the effluent of the anaerobic tank (5) enters an aerobic tank (6), the aerobic tank (6) performs nitration reaction and phosphorus absorption processes through the strengthening action of nitrifying bacteria, phosphorus accumulating bacteria and fillers (11) in an aeration stage, and the aerobic tank (6) performs COD removal, denitrification reaction and phosphorus absorption processes through the strengthening action of denitrifying bacteria, denitrifying phosphorus accumulating bacteria and fillers (11) in an aeration stop stage;
and (3) post-treatment: and the effluent of the aerobic tank (6) enters a secondary sedimentation tank (7) for mud-water separation, part of the generated sludge flows back to the anaerobic tank (5), the residual sludge is dewatered by a dewatering machine room (10) and then transported outwards, and the effluent of the secondary sedimentation tank (7) is sterilized by a sterilizing tank (8) and then discharged.
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