CN110606627A - Coupling treatment system of iron-promoted magnetic loading anaerobic/anoxic activated sludge method and biofilm method - Google Patents
Coupling treatment system of iron-promoted magnetic loading anaerobic/anoxic activated sludge method and biofilm method Download PDFInfo
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- 238000011068 loading method Methods 0.000 title claims abstract description 14
- 230000008878 coupling Effects 0.000 title abstract description 7
- 238000010168 coupling process Methods 0.000 title abstract description 7
- 238000005859 coupling reaction Methods 0.000 title abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 40
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 38
- 239000011574 phosphorus Substances 0.000 claims abstract description 38
- 230000008569 process Effects 0.000 claims abstract description 30
- 239000010865 sewage Substances 0.000 claims abstract description 23
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 20
- 238000004062 sedimentation Methods 0.000 claims description 117
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 90
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 55
- 239000007788 liquid Substances 0.000 claims description 45
- 239000000843 powder Substances 0.000 claims description 42
- 229910052742 iron Inorganic materials 0.000 claims description 40
- 239000012528 membrane Substances 0.000 claims description 39
- 239000002131 composite material Substances 0.000 claims description 37
- 230000005294 ferromagnetic effect Effects 0.000 claims description 32
- 230000001546 nitrifying effect Effects 0.000 claims description 28
- 238000005273 aeration Methods 0.000 claims description 26
- 239000000126 substance Substances 0.000 claims description 24
- 238000000926 separation method Methods 0.000 claims description 18
- 239000006228 supernatant Substances 0.000 claims description 14
- 239000006148 magnetic separator Substances 0.000 claims description 10
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical group O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 9
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 7
- 238000011084 recovery Methods 0.000 claims description 7
- 238000010992 reflux Methods 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 4
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 229910021577 Iron(II) chloride Inorganic materials 0.000 claims description 3
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims description 3
- 101150027686 psaF gene Proteins 0.000 claims description 3
- 238000004659 sterilization and disinfection Methods 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 230000005389 magnetism Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- 230000010354 integration Effects 0.000 abstract description 2
- 241000894006 Bacteria Species 0.000 description 23
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 12
- 238000005189 flocculation Methods 0.000 description 10
- 230000016615 flocculation Effects 0.000 description 10
- 238000002156 mixing Methods 0.000 description 10
- 229910002651 NO3 Inorganic materials 0.000 description 8
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000003344 environmental pollutant Substances 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 230000005484 gravity Effects 0.000 description 6
- 244000005700 microbiome Species 0.000 description 6
- 230000001737 promoting effect Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical group [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000007792 addition Methods 0.000 description 4
- 230000026676 system process Effects 0.000 description 4
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 3
- 229910000155 iron(II) phosphate Inorganic materials 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 239000010452 phosphate Substances 0.000 description 2
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- 239000013589 supplement Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 241000108664 Nitrobacteria Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
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- 230000001651 autotrophic effect Effects 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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- 229920001903 high density polyethylene Polymers 0.000 description 1
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- 239000000413 hydrolysate Substances 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 230000005426 magnetic field effect Effects 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 1
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
- 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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
-
- 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]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
-
- 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
- C02F2209/14—NH3-N
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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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
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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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
- C02F2303/06—Sludge reduction, e.g. by lysis
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
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- 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)
Abstract
The invention discloses an iron-promoted magnetic loading anaerobic/anoxic activated sludge process and biofilm process coupling treatment system, and relates to the technical field of sewage treatment. Compared with the conventional nitrogen and phosphorus removal process, the method has the advantages that the concentration of the activated sludge of the system can be greatly improved, and the biological nitrogen and phosphorus removal effect can be enhanced; simultaneously, the risk of sludge bulking is reduced; the method has the advantages of high process integration level, good effect, reliable operation, convenient management, high load, land occupation saving and the like.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a coupling treatment system of an iron-promoted magnetic loading anaerobic/anoxic activated sludge method and a biofilm method.
Background
At present, water eutrophication has become a global environmental problem. The mass discharge of domestic sewage and industrial wastewater leads to mass intake of substances containing nitrogen and phosphorus in the water body and leads to eutrophication of the water body; the biological nitrogen and phosphorus removal process has the advantages of low cost, less secondary pollution, mild conditions and the like, and is widely applied to the nitrogen and phosphorus removal of wastewater.
At present, the drainage standards of municipal and industrial sewage plants are higher and higher, and part of local standards are higher than the first-class A emission standard of GB18918-2002 discharge Standard of pollutants for municipal and industrial sewage plants; and the sewage plant is faced with the increase of water inflow at the same time, so that the treatment capacity is insufficient or the discharged water can not reach the standard stably. Therefore, newly built or modified sewage plants all face the problems of how to realize upgrading modification or save occupied area of plant areas, stable standard-reaching of drainage and the like.
Particularly for low C/N sewage, the traditional denitrification and dephosphorization technology is faced with the problems of insufficient carbon source, difficult control of anaerobic environment, low denitrification efficiency, contradiction of sludge age between nitrifying bacteria and phosphorus removing bacteria, frequent sludge bulking, large occupied area and the like, and is difficult to meet the requirement of high discharge standard.
Disclosure of Invention
The invention discloses a coupling treatment system of an iron-promoted magnetically-loaded anaerobic/anoxic activated sludge method and a biomembrane method, and aims to solve the problems of insufficient carbon source in denitrification and dephosphorization, difficult control of anaerobic environment, low denitrification efficiency, contradiction of sludge age between nitrifying bacteria and phosphorus removing bacteria, frequent sludge bulking, large occupied area and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
an iron-promoted magnetic loading anaerobic/anoxic activated sludge process and biofilm process coupling treatment system comprises an anaerobic tank, an anoxic tank, a sedimentation tank, a biofilm tank and a post-treatment system which are sequentially connected, wherein the anaerobic tank is connected with a composite iron system substance adding system, and the sedimentation tank is also connected with a magnetic seed separation system.
As a further optimization of the invention, the anaerobic tank is provided with a water inlet, a sludge return inlet, a composite iron system promoter adding inlet, an anaerobic mixed liquid outlet and a ferromagnetic powder recovering inlet; sewage enters the anaerobic tank through a water inlet, and a composite iron system substance promotion adding inlet is connected with a composite iron system substance promotion adding outlet of a composite iron system substance promotion adding system; an anaerobic stirrer is arranged in the anaerobic tank.
As a further preferred aspect of the present invention, the anoxic tank is provided with an anaerobic mixed liquor inlet, a nitrifying liquor reflux inlet and an anoxic mixed liquor outlet, the anaerobic mixed liquor outlet of the anaerobic tank is connected to the anaerobic mixed liquor inlet of the anoxic tank, and the anoxic tank is provided with an anoxic stirrer.
As a further preferred aspect of the invention, the sedimentation tank is provided with an anoxic mixed liquor inlet, a supernatant liquor discharge outlet and a sludge return outlet, the sludge return outlet is connected with the sludge return inlet on the anaerobic tank, and the anoxic mixed liquor outlet on the anoxic tank is connected with the anoxic mixed liquor inlet on the sedimentation tank; the bottom of the sedimentation tank is provided with a mud scraper and a sludge hopper, and the upper part of the sedimentation tank is provided with an overflow weir; the sedimentation tank is selected from one of a horizontal flow sedimentation tank, a vertical flow sedimentation tank, an inclined tube (plate) sedimentation tank and a radial flow sedimentation tank.
As a further optimization of the invention, a supernatant discharge inlet, a nitrifying liquid backflow outlet and a nitrifying mixed liquid outlet are arranged on the biological membrane pool, the nitrifying liquid backflow outlet on the biological membrane pool is connected with the nitrifying liquid backflow inlet on the anaerobic pool, a supernatant discharge outlet on the sedimentation pool is connected with the supernatant discharge inlet on the biological membrane pool, and the nitrifying mixed liquid outlet on the biological membrane pool is connected with the nitrifying liquid backflow inlet on the anoxic pool; the biological membrane tank is also provided with a bottom aeration system or a membrane aeration system, and the bottom aeration system or the membrane aeration system adopts perforation aeration and/or micropore aeration; the biomembrane pool is at least one of a Biological Aerated Filter (BAF), a biological contact oxidation pool, a Moving Bed Biofilm Reactor (MBBR) and a membrane oxygen transfer biofilm reactor (MABR).
As a further optimization of the invention, the post-treatment system is used for post-treatment after sewage treatment, and comprises at least one of a mud-water separation and precipitation device, a filtering device, a deep nitrogen and phosphorus removal device and a disinfection device; the post-treatment system is also provided with a nitrified mixed liquid inlet and a water outlet, and the nitrified mixed liquid outlet on the biological membrane tank is connected with the nitrified mixed liquid inlet on the post-treatment system.
As a further preferred aspect of the present invention, the magnetic seed separation system comprises a high shear and a magnetic separator, the magnetic seed separation system is further provided with a residual sludge inlet, a recovered ferromagnetic powder outlet and a sludge discharge outlet, the recovered ferromagnetic powder outlet is connected to the recovered ferromagnetic powder inlet on the anaerobic tank, and the residual sludge inlet on the magnetic seed separation system is connected to the sludge return outlet on the sedimentation tank.
Further preferably, the concentration of the activated sludge in the anaerobic tank and the anoxic tank is 8000-20000 mg/L.
In a further preferred embodiment of the present invention, the complex iron-based accelerator is selected from the group consisting of iron oxide powder (Fe)3O4)、Fe0、FeSO4、FeCl2、Fe2(SO4)3、FeCl3One or more of polyferric sulfate (PFS), polyaluminum ferric chloride (PAFC), and polyaluminum ferric silicate (PSAF).
As a further preferred aspect of the present invention, the composite iron system comprises a ferroferric oxide powder, and the added ferroferric oxide powder has a particle size of 40-200 μm; according to different control indexes of pollutants in inlet and outlet water, Fe0、FeSO4、FeCl2、Fe2(SO4)3、FeCl3PFS, PAFC and PSAF are added and the proportion is adjusted accordingly so as to meet the requirement of stable standard discharge of each index.
In the present invention, the functions of the units are as follows:
the front section of the system process takes a composite iron-based substance-promoting reinforced anaerobic/anoxic activated sludge method as a core, and the specific gravity and the sedimentation performance of sludge flocs are greatly improved by adding the composite iron-based substance into an anaerobic tank, so that the concentration of activated sludge in the system is improved; under the condition of alternate operation of anaerobic/anoxic environment, denitrifying phosphorus removal bacteria (DPB) are easy to enrich, and high-efficiency nitrogen and phosphorus removal of low-C/N wastewater is realized; the back section of the system process takes a biological membrane process as a core, nitrifying bacteria are attached to a carrier to grow and be enriched, the nitrification and synchronous nitrification-denitrification (SND) denitrification functions of the system are enhanced, and the risk of sludge bulking is avoided.
In an anaerobic pool, inlet water is mixed with mixed liquid, ferromagnetic powder is recovered, returned sludge and composite iron system promoting substances are mixed, macromolecular organic matters are converted into micromolecular volatile organic matters under the action of anaerobic bacteria, and phosphorus in cells is hydrolyzed into orthophosphate by phosphorus accumulating bacteria.
In the anoxic tank, the nitrifying liquid flows back to the anoxic tank to supplement nitrate to the anoxic tank; under the condition of insufficient carbon source, the denitrifying phosphorus accumulating bacteria in the anoxic tank can excessively absorb phosphorus and remove nitrate, so that one-carbon dual-purpose is realized, and the nitrogen and phosphorus removal effect of the system is enhanced.
In the sedimentation tank, sludge and water are separated, one part of the separated sludge containing ferromagnetic powder flows back to the anaerobic tank, and the other part of the separated sludge enters a magnetic seed separation system; and the separated supernatant flows into the biomembrane pond.
In the magnetic separation system, the sludge containing the ferromagnetic powder is sequentially stripped from the residual sludge through a high shear machine, then the ferromagnetic powder is separated from the residual sludge through a magnetic separator, the separated ferromagnetic powder flows back to the anaerobic tank, and the separated residual sludge is discharged out of the system.
In the biomembrane pond, pollutants such as ammonia nitrogen and the like in the supernatant are converted into nitrate or nitrite to provide a substrate for anoxic denitrification under the action of nitrifying bacteria loaded on the carrier.
In the post-treatment equipment, suspended matters and total phosphorus in the effluent of the aerobic biomembrane pond are removed, so that the effluent is discharged after reaching the standard.
In the invention, the return of the nitrifying liquid can supplement nitrate for the anoxic tank and provide substrate conditions for denitrifying phosphorus removal, and the return of sludge can return the activated sludge of ferromagnetic powder to the anaerobic tank so as to maintain the high sludge concentration of the anaerobic/anoxic activated sludge system; meanwhile, the concentration of dissolved oxygen and nitrate in the anaerobic tank is controlled, and good conditions are provided for phosphorus release of the anaerobic tank.
Compared with the conventional nitrogen and phosphorus removal technology, the method has the following beneficial effects:
1. enhanced phosphorus removal effect
11) Denitrifying phosphorus removal
Under the condition of alternate operation of anaerobic/anoxic environment, denitrifying phosphorus removal bacteria (DPB) with denitrification and phosphorus removal can be easily enriched, and NO can be utilized under the anoxic condition3 -As an electron acceptor, completing the processes of excessive phosphorus absorption and denitrification; the demand on a carbon source is greatly reduced, and double saving of energy and resources is realized; the denitrifying phosphorus removal can save about 50% of COD, about 30% of oxygen and about 50% of residual sludge.
12) Auxiliary chemical phosphorus removal
Adding composite iron-based promoter such as Fe into anaerobic tank0、Fe2+、Fe3+And can be reacted directly or indirectly with phosphate.
With Fe2+For example, Fe2+Reacts with phosphate in the anaerobic tank to generate indissolvable Fe3(PO4)2The reaction formula (1) is as follows:
3Fe2++2PO4 3-→Fe3(PO4)2(s)(1)
produced Fe3(PO4)2The sediment is attached to the sludge flocs through the flocculation of the sludge; fe by discharging excess sludge3(PO4)2And the sediment is discharged out of the system, so that the dephosphorization efficiency is improved.
2. Enhanced denitrification effect
21) The phosphorus removal bacteria and the nitrifying bacteria of the traditional nitrogen and phosphorus removal process have a sludge age contradiction; the denitrification phosphorus accumulating bacteria are enriched by the alternate operation of anaerobic/anoxic environment; the main functions of the device are COD removal and denitrification dephosphorization; by adding the biofilm carrier into the aerobic tank, a good living environment is provided for nitrifying bacteria, and efficient denitrification is realized; respectively culturing nitrifying bacteria, denitrifying phosphorus accumulating bacteria and other heterotrophic and autotrophic denitrifying bacteria in different sludge systems to form a double-sludge system; so that each functional bacterium is in the respective suitable environment for growth, and the stable and efficient nitrogen and phosphorus removal of the system is facilitated.
22) The addition of the composite iron system promoter and the recovery of the ferromagnetic powder can provide a large attachment area for the growth and enrichment of anaerobic/anoxic microorganisms and provide a good living environment for the anaerobic/anoxic microorganisms; the process later stage takes a biomembrane process as a core, and because the diffusion of oxygen in the biomembrane is limited, the surface of the biomembrane is in an aerobic state, the inner layer is in an anoxic or even anaerobic state, or the inner part is in an aerobic state and the surface is in an anoxic state, so that the biomembrane has good nitrification and certain synchronous nitrification and denitrification functions.
23) Adding composite iron-based promoters, e.g. Fe, to sludge systems for long periods0、Fe2+、Fe3+Both can be used as an electron donor or acceptor to participate in the oxidation or reduction process of nitrogen.
With Fe2+For example, under the action of microorganisms, Fe2+The nitrate or nitrite can be used as an electron donor to reduce the nitrate or nitrite into nitrogen, namely, a ferrous denitrification phenomenon is generated to enhance the removal of the total nitrogen of the system, and the chemical reaction formula of the ferrous denitrification is shown in (2) to (3):
2NO3 -+10Fe2++24H2O→10Fe(OH)3+N2+18H+(2)
2NO2 -+6Fe2++14H2O→6Fe(OH)3+N2+10H+(3)
electron donor with Fe2+For example, n (Fe) consumed by the iron-type denitrification process2+)/n(NO3 -) Is 5: 1 or n (Fe)2+)/n(NO2 -) The ratio is 3: 1.
3. Enhanced carbon removal effect
31) Adding composite iron-based promoters, e.g. Fe, to sludge systems for long periods0、Fe2+、Fe3+Can directly or indirectly promote the decomposition and anabolism of microorganisms to organic matters, and simultaneously strengthen the flocculation effect of sludge flocs to colloids or suspended matters in water.
With Fe2+For example, Fe2+The hydrolysate can be flocculated, net-captured, swept, and adsorbed to form bridge, and has coagulation effect on organic colloid or suspended matter in waterThe system is used for removing organic matters.
32) Adding composite iron system promoter and recovering ferromagnetic powder to form higher sludge concentration; the concentration of hydrolytic acidification bacteria and extracellular enzymes of cells is improved, and colloid and suspended organic matters in the inlet water are promoted to be fully converted into soluble organic matters to be efficiently utilized; meanwhile, part of organic matters which are difficult to aerobically biodegrade can be converted into biodegradable organic matters.
4. Shorten the time for separating mud and water
The conventional nitrogen and phosphorus removal process has low sludge specific gravity, and the surface load of the sedimentation tank is usually 0.6-1.0m3/(m2H), the specific gravity of the activated sludge can be increased by adding composite iron series promoting substances and recycling ferromagnetic powder, so that the activated sludge floc structure is compact, and the surface load of a sedimentation tank can reach 3.0-8.0m3/(m2H), greatly shortening the mud-water separation time.
5. Impact load resistance of reinforcing system
51) The anaerobic/anoxic activated sludge system adds the composite iron system promoting substances and recovers the ferromagnetic powder, so that the specific gravity of the sludge flocs is greatly improved, and the sedimentation performance of the sludge flocs is greatly improved. The concentration of the activated sludge in the conventional activated sludge method is 2500-4000 mg/L; after the ferromagnetic powder is added, the concentration of the activated sludge can reach 8000-.
52) After the conventional nitrogen and phosphorus removal process is impacted, nitrifying bacteria are easily inhibited, so that the proportion of the nitrifying bacteria is gradually reduced, and the effluent cannot stably reach the standard; the biomembrane process fixes nitrobacteria on the carrier in an attached state by adding the carrier, so that the resistance to short-term impact is obviously enhanced.
6. Low sludge yield and avoiding sludge bulking
61) The anaerobic/anoxic activated sludge system adds the composite iron system promoting substances and recovers the ferromagnetic powder, so that the specific gravity of sludge flocs is greatly improved, the sedimentation performance of the sludge flocs is greatly improved, and the sludge is not easy to expand; meanwhile, the system can generate a magnetic field effect due to the existence of ferromagnetic powder, balance the growth and decay of microorganisms in the activated sludge and effectively inhibit sludge bulking. Meanwhile, the anaerobic/anoxic setting strengthens denitrification dephosphorization, realizes 'one carbon dual-purpose', and reduces the sludge yield of an anaerobic/anoxic activated sludge system.
62) In the biological membrane process, microorganisms exist on the surface of the carrier in an attached state, and the risk of sludge bulking is avoided; meanwhile, the yield of the biomembrane sludge is lower than that of the activated sludge method, and the sludge yield of the aerobic process is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of an embodiment;
wherein, 1-water inlet pipe; 2-an anaerobic tank; 3-anaerobic agitator; 4-anoxic pond; 5-an anoxic stirrer; 6-a sludge return pipe; 7-sludge reflux pump; 8-high shearing machine; 9-magnetic separator; 10-recovery of ferromagnetic powder replenishing pipes; 11-excess sludge discharge pipe; 12-a compound iron system addition promoting system; 13-a water inlet pipe of a sedimentation tank; 14-a sedimentation tank draft tube; 15-a sedimentation tank; 16-a sedimentation tank mud scraper; 17-sedimentation tank sludge bucket; 18-a mud flap of the sedimentation tank; 19-a sedimentation tank water collecting channel; 20-an aerobic pure membrane MBBR tank; 21-a suspending vehicle; 22-an aeration system; 23-pure membrane MBBR water outlet pipe; 24-a blower; 25-nitrifying liquid reflux pump; 26-a rapid mixing tank; 27-PAC dosing system; 28-a rapid mixing agitator; 29-a flocculation tank; 30-PAM dosing system; 31-a flocculating agitator; 32-a flocculation guide cylinder; 33-a high-efficiency sedimentation tank; 34-high-efficiency sedimentation tank sludge hopper; 35-a high-efficiency sedimentation tank mud scraper; 36-high efficiency sedimentation tank sludge pump; 37-a high-efficiency sedimentation tank return pipe; 38-a sludge discharge pipe of the high-efficiency sedimentation tank; 39-high efficiency sedimentation tank partition board; 40-high-efficiency sedimentation tank inclined tube; 41-high-efficiency sedimentation tank water collecting channel; 42-a water outlet pipe of the high-efficiency sedimentation tank; 43-rotary disc filter chamber; 44-water outlet pipe of the rotary disc filter tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention discloses a coupling treatment system of an iron-promoted magnetic loading anaerobic/anoxic activated sludge method and a biofilm method, which comprises an anaerobic tank, an anoxic tank, a sedimentation tank, a biofilm tank and a post-treatment system which are sequentially connected as shown in figure 1, wherein the anaerobic tank is connected with a composite iron system promotion adding system, and the sedimentation tank is also connected with a magnetic seed separation system.
Particularly, a water inlet, a sludge return inlet, a composite iron system substance adding inlet, an anaerobic mixed liquid outlet and a ferromagnetic powder recycling inlet are arranged on the anaerobic tank; sewage enters the anaerobic tank through a water inlet, and a composite iron system substance promotion adding inlet is connected with a composite iron system substance promotion adding outlet of a composite iron system substance promotion adding system; an anaerobic stirrer is arranged in the anaerobic tank.
Particularly, the anaerobic mixing liquid inlet, the nitrifying liquid backflow inlet and the anaerobic mixing liquid outlet are formed in the anoxic tank, the anaerobic mixing liquid outlet of the anaerobic tank is connected with the anaerobic mixing liquid inlet of the anoxic tank, and an anoxic stirrer is arranged in the anoxic tank.
Particularly, the sedimentation tank is provided with an anoxic mixed liquid inlet, a supernatant liquid discharge outlet and a sludge backflow outlet, the sludge backflow outlet on the sedimentation tank is connected with the sludge backflow inlet on the anaerobic tank, and the anoxic mixed liquid outlet on the anoxic tank is connected with the anoxic mixed liquid inlet on the sedimentation tank; the bottom of the sedimentation tank is provided with a mud scraper and a sludge hopper, and the upper part of the sedimentation tank is provided with an overflow weir.
The sedimentation tank is a horizontal flow sedimentation tank.
Particularly, a supernatant discharge inlet, a nitrifying liquid backflow outlet and a nitrifying mixed liquid outlet are arranged on the biological membrane pool, the nitrifying liquid backflow outlet on the biological membrane pool is connected with the nitrifying liquid backflow inlet on the anaerobic pool, a supernatant discharge outlet on the sedimentation pool is connected with the supernatant discharge inlet on the biological membrane pool, and the nitrifying mixed liquid outlet on the biological membrane pool is connected with the nitrifying liquid backflow inlet on the anoxic pool; the biological membrane tank is also provided with a bottom aeration system, a stirrer can be additionally arranged according to actual needs, and the bottom aeration system is used for perforating aeration.
The biological membrane tank is a Biological Aerated Filter (BAF).
Particularly, the post-treatment system is used for post-treatment after sewage treatment, and comprises a mud-water separation and sedimentation device; the post-treatment system is also provided with a nitrified mixed liquid inlet and a water outlet, and the nitrified mixed liquid outlet on the biological membrane tank is connected with the nitrified mixed liquid inlet on the post-treatment system.
Particularly, the magnetic seed separation system comprises a high shear and a magnetic separator, the magnetic seed separation system is also provided with a residual sludge inlet, a ferromagnetic powder recovery outlet and a sludge discharge outlet, the ferromagnetic powder recovery outlet is connected with a ferromagnetic powder recovery inlet on the anaerobic tank, and the residual sludge inlet on the magnetic seed separation system is connected with a sludge return outlet on the sedimentation tank. Stripping ferromagnetic powder and residual sludge in part of the sludge containing ferromagnetic powder collected at the bottom of the sedimentation tank by a high shear; separating ferromagnetic powder from residual sludge by a magnetic separator; then the recovered ferromagnetic powder flows back to the anaerobic tank, and the residual sludge is discharged out of the system.
Particularly, the concentration of the activated sludge in the anaerobic tank and the anoxic tank is 8000-20000 mg/L.
In particular, the complex iron-based accelerator is selected from ferroferric oxide powder (Fe)3O4) And FeSO4(ii) a The grain diameter of the added ferroferric oxide powder is 50 mu m; according to different control indexes of pollutants in inlet and outlet water, FeSO4The addition and the proportion can be adjusted to meet the requirement of stable standard emission of each index.
Example 2
The difference from the embodiment 1 is that:
the sedimentation tank adopts a vertical flow sedimentation tank.
The biological membrane tank is also provided with a bottom aeration system, a stirrer can be additionally arranged according to actual needs, and the bottom aeration system adopts perforation aeration and micropore combined aeration.
The biological membrane pool is a biological contact oxidation pool.
The post-treatment system is used for post-treatment after sewage treatment and comprises a mud-water separation and sedimentation device and a filtering device.
The composite iron-based accelerator is ferroferric oxide powder (Fe)3O4) (ii) a And the grain diameter of the added ferroferric oxide powder is 100 mu m.
Example 3
The difference from the embodiment 1 is that:
the sedimentation tank is an inclined tube (plate) sedimentation tank.
The biological membrane tank is also provided with a membrane aeration system, and a stirrer can be additionally arranged according to actual needs, wherein the membrane aeration system adopts micropore aeration.
The biological membrane tank is a Biological Aerated Filter (BAF) and a membrane oxygen-transfer biofilm reactor (MABR).
The post-treatment system is used for post-treatment after sewage treatment and comprises a filtering device, a deep nitrogen and phosphorus removal device and a disinfection device.
The composite iron-based accelerator is ferroferric oxide powder (Fe)3O4)、FeCl3Polymeric Ferric Sulfate (PFS); the grain diameter of the added ferroferric oxide powder is 200 mu m; according to different control indexes of pollutants in inlet and outlet water, FeCl3PFS adding and proportion can be adjusted to meet the requirement of stable standard discharge of each index.
Examples
The sewage treatment system is characterized in that domestic sewage of a certain village and town is treated by adopting a sewage treatment system which is coupled by a composite iron system substance promotion enhanced anaerobic/anoxic activated sludge method and a biomembrane method, as shown in figure 2, the sewage treatment system comprises an anaerobic tank 2, an anoxic tank 4, a sedimentation tank 15, an aerobic pure membrane MBBR tank 20, a fast mixing tank 26, a flocculation tank 29, a high-efficiency sedimentation tank 33 and a rotary disc filter tank 43 which are sequentially connected, wherein the anaerobic tank 2 is connected with a composite iron system substance promotion adding system 12, and the sedimentation tank 15 is also connected with a high shear 8 and a magnetic separator 9.
The anaerobic tank 2 is provided with a water inlet pipe 1, the anaerobic stirrer 3 is positioned inside the anaerobic tank 2, and the composite iron system substance-promoting adding system 12 is arranged above the anaerobic tank 2.
An anoxic stirrer 5 is arranged in the anoxic tank 4, a high shear 8 and a magnetic separator 9 are arranged above the anoxic tank 4, and the anoxic tank 4 is also connected with a sludge return pipe 6.
A sedimentation tank water inlet pipe 13, a sedimentation tank guide cylinder 14, a sedimentation tank mud scraper 16, a sedimentation tank sludge hopper 17, a sedimentation tank mud guard 18 and a sedimentation tank water collecting channel 19 are arranged in the sedimentation tank 15; a sedimentation tank sludge hopper 17 is arranged at the bottom of the sedimentation tank 15, a sedimentation tank mud scraper 16 is also arranged on the sedimentation tank sludge hopper 17, and a sedimentation tank guide cylinder 14 is arranged in the middle of the sedimentation tank 15; the mixed liquid in the anoxic tank 4 is communicated with a sedimentation tank guide cylinder 14 through a sedimentation tank water inlet pipe 13, and the upper part of the sedimentation tank guide cylinder 14 is also provided with two groups of sedimentation tank splash guards 18 and sedimentation tank water collecting channels 19 which are connected; the sedimentation tank water collecting channel 19 is communicated with an aerobic pure membrane MBBR tank 20; the pipeline of the sludge reflux pump 7 is connected with the bottom of a sludge hopper 17 of the sedimentation tank, a water outlet pipeline is divided into two paths and is regulated and controlled through the opening degree of a valve, wherein one path is connected with the anaerobic tank 2, and the other path is connected with a high shear 8; the high shear 8 is connected with a magnetic separator 9, ferromagnetic powder separated by the magnetic separator 9 flows into the anaerobic tank 2 through a ferromagnetic powder recovery supplementing pipe 10, and separated excess sludge is discharged out of the system through an excess sludge discharge pipe 11.
Adding a suspension carrier 21 into the pure membrane MBBR tank, and arranging an aeration system 22 at the bottom of the pure membrane MBBR tank; the suspension carrier 21 is a columnar suspension carrier, is made of HDPE and has a diameter of 25 mm; the aeration system 22 uses a "perforation + micro-hole" combination aeration.
The aeration system 22 is connected with an air blower 24, and the aerobic pure membrane MBBR tank 20 is connected with the anoxic tank 4 through a nitrifying liquid reflux pump 25; a pure membrane MBBR water outlet pipe 23 connects the aerobic pure membrane MBBR tank 20 with the fast mixing tank 26.
A PAC adding system 27 and a quick mixing stirrer 28 are arranged in the quick mixing tank 26.
A PAM adding system 30, a flocculation stirrer 31 and a flocculation guide cylinder 32 are arranged in the flocculation tank 29; the flocculation guide cylinder 32 is arranged in the middle of the flocculation tank 29.
The efficient sedimentation tank 33 is internally provided with an efficient sedimentation tank sludge hopper 34, an efficient sedimentation tank mud scraper 35, an efficient sedimentation tank clapboard 39, an efficient sedimentation tank inclined pipe 40 and an efficient sedimentation tank water collecting channel 41; the bottom of the high-efficiency sedimentation tank 33 is provided with a high-efficiency sedimentation tank sludge hopper 34, the upper part of the high-efficiency sedimentation tank sludge hopper 34 is provided with a high-efficiency sedimentation tank sludge scraper 35, and the high-efficiency sedimentation tank sludge scraper is high-efficiency sedimentationThe sedimentation tank inclined pipe 40 is positioned at the middle upper part of the high-efficiency sedimentation tank 33; the inclined tube 40 of the high-efficiency sedimentation tank is made of PP with the apertureThe slant length is 1000 mm; the high-efficiency sedimentation tank partition plate 39 is connected with a high-efficiency sedimentation tank inclined pipe 40; the high-efficiency sedimentation tank water collecting channel 41 is arranged right above the high-efficiency sedimentation tank inclined pipe 40, the high-efficiency sedimentation tank water outlet pipe 42 is connected with the high-efficiency sedimentation tank water collecting channel 41, the high-efficiency sedimentation tank sludge hopper 34 is connected with the high-efficiency sedimentation tank sludge discharge pump 36, the water outlet pipeline is divided into two paths, the two paths are regulated and controlled through the opening degree of a valve, one path is connected with the high-efficiency sedimentation tank return pipe 37, and the other path is connected with the high-efficiency sedimentation tank sludge discharge pipe 38;
the rotary disc filter 43 is connected with the high-efficiency sedimentation tank 33 through a water outlet pipe 42 of the high-efficiency sedimentation tank, and the filtered water is discharged out of the system through a water outlet pipe 44 of the rotary disc filter.
The design water volume of a domestic sewage treatment project of a certain village and town is 500m3The occupied area is limited, and the requirement on the water quality of the effluent is high; therefore, a sewage treatment system coupled by a composite iron system substance-promoting enhanced anaerobic/anoxic activated sludge method and a biomembrane method is used as an emergency facility, and the treated effluent meets the quasi-IV effluent requirements. The specific data are shown in the following table:
TABLE 1 average quality of inlet and outlet water in a certain village and town domestic sewage treatment project
Note: the data is the average inlet and outlet water quality of the system.
The system can effectively remove various pollutants in water, and the quality of effluent is stable; is superior to the discharge limit requirement of quasi IV class effluent; greatly reduces the emission of pollutants and reduces the influence on the environment; wherein CODcr reduces 73.73 ton/year BOD5Emission reduction is 37.94 tons/year, ammonia nitrogen emission reduction is 7.98 tons/year, total nitrogen emission reduction is 8.05 tons/year, total phosphorus emission reduction is 1.18 tons/year, and SS emission reduction is 41.79 tons/year.
Compared with the conventional anaerobic reactor, the system process of the invention takes the composite iron-based substance promotion reinforced anaerobic/anoxic activated sludge method as the core in the front section, and the specific gravity and sedimentation performance of sludge flocs are greatly improved by adding the composite iron-based substance promotion into the anaerobic tank 2, so that the concentration of activated sludge in the system is improved; under the condition of alternate operation of anaerobic/anoxic environment, denitrifying phosphorus removal bacteria (DPB) are easy to enrich, and high-efficiency nitrogen and phosphorus removal of low-C/N wastewater is realized; the rear section of the system process takes a biological membrane process as a core, and nitrifying bacteria are attached to the surface of the carrier to grow and be enriched, so that the denitrification function of the system is enhanced, and the risk of sludge bulking is avoided; the method has the advantages of high process integration level, good effect, reliable operation, convenient management, land occupation saving and the like, and in addition, process equipment can realize unattended operation through linkage control.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (9)
1. The coupled treatment system of the iron-promoted magnetic loading anaerobic/anoxic activated sludge method and the biomembrane method is characterized by comprising an anaerobic tank, an anoxic tank, a sedimentation tank, a biomembrane tank and a post-treatment system which are sequentially connected, wherein the anaerobic tank is connected with a composite iron system substance promotion adding system, and the sedimentation tank is also connected with a magnetic seed separation system.
2. The coupled treatment system of an iron-promoted magnetic loading anaerobic/anoxic activated sludge method and a biofilm method according to claim 1, wherein the anaerobic tank is provided with a water inlet, a sludge return inlet, a composite iron system promoter adding inlet, an anaerobic mixed liquid outlet and a ferromagnetic powder recovery inlet; sewage enters an anaerobic tank through a water inlet, a composite iron system substance adding inlet is connected with a composite iron system substance adding outlet of a composite iron system substance adding system, and a composite iron system substance is added into the anaerobic tank; an anaerobic stirrer is arranged in the anaerobic tank.
3. The coupled treatment system of an iron-promoted magnetic-loading anaerobic/anoxic activated sludge process and a biofilm process as claimed in claim 1, wherein the anoxic tank is provided with an anaerobic mixed liquor inlet, a nitrifying liquor reflux inlet and an anoxic mixed liquor outlet, the anaerobic mixed liquor outlet of the anaerobic tank is connected with the anaerobic mixed liquor inlet of the anoxic tank, and the anoxic tank is provided with an anoxic stirrer.
4. The coupled treatment system of an iron-promoted magnetic loading anaerobic/anoxic activated sludge method and a biofilm method according to claim 1, wherein the sedimentation tank is provided with an anoxic mixed liquor inlet, a supernatant discharge outlet and a sludge return outlet, the sludge return outlet is connected with the sludge return inlet on the anaerobic tank, and the anoxic mixed liquor inlet of the sedimentation tank is connected with the anoxic mixed liquor outlet of the anoxic tank; the bottom of the sedimentation tank is provided with a mud scraper and a sludge hopper, and the upper part of the sedimentation tank is provided with an overflow weir; the sedimentation tank is selected from one of a horizontal flow sedimentation tank, a vertical flow sedimentation tank, an inclined tube (plate) sedimentation tank and a radial flow sedimentation tank.
5. The coupled treatment system of an iron-promoted magnetic loading anaerobic/anoxic activated sludge process and a biofilm process as claimed in claim 1, wherein a supernatant discharge inlet, a nitrified liquid return outlet and a nitrified mixed liquid outlet are arranged on the biofilm tank, the nitrified liquid return outlet on the biofilm tank is connected with the nitrified liquid return inlet on the anaerobic tank, the supernatant discharge outlet on the sedimentation tank is connected with the supernatant discharge inlet on the biofilm tank, and the nitrified mixed liquid outlet on the biofilm tank is connected with the nitrified liquid return inlet on the anoxic tank; the biological membrane tank is also provided with a bottom aeration system or a membrane aeration system, and the bottom aeration system adopts perforation aeration and/or micropore aeration; the biomembrane pool is at least one of a Biological Aerated Filter (BAF), a biological contact oxidation pool, a Moving Bed Biofilm Reactor (MBBR) and a membrane oxygen transfer biofilm reactor (MABR).
6. The coupled treatment system of the iron-promoted magnetic loading anaerobic/anoxic activated sludge process and the biofilm process as claimed in claim 1, wherein the post-treatment system is used for post-treatment after sewage treatment, and comprises at least one of a mud-water separation and precipitation device, a filtering device, a deep nitrogen and phosphorus removal device and a disinfection device; the post-treatment system is also provided with a nitrified mixed liquid inlet and a water outlet, and the nitrified mixed liquid inlet on the post-treatment system is connected with the nitrified mixed liquid outlet on the biological membrane tank.
7. The coupled treatment system of an anaerobic/anoxic activated sludge process and a biomembrane process promoted by iron and loaded with magnetism as claimed in claim 1, wherein the magnetic seed separation system comprises a high shear and a magnetic separator, the magnetic seed separation system is further provided with a residual sludge inlet, a recovered ferromagnetic powder outlet and a sludge discharge outlet, the recovered ferromagnetic powder outlet is connected with the recovered ferromagnetic powder inlet on the anaerobic tank, and the residual sludge inlet on the magnetic seed separation system is connected with a sludge return outlet on the sedimentation tank.
8. The coupled treatment system of the iron-promoted magnetic loading anaerobic/anoxic activated sludge method and the biofilm method as claimed in claim 3, wherein the activated sludge concentration in the anaerobic tank and the anoxic tank is 8000-20000 mg/L.
9. The coupled treatment system of the iron-promoted magnetic-loading anaerobic/anoxic activated sludge process and the biofilm process as claimed in claim 2, wherein the composite iron-based promoter is selected from ferroferric oxide powder (Fe)3O4)、Fe0、FeSO4、FeCl2、Fe2(SO4)3、FeCl3One or more of polyferric sulfate (PFS), polyaluminum ferric chloride (PAFC), and polyaluminum ferric silicate (PSAF).
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