CN110590078A - Iron-promoted magnetic loading anaerobic reaction system - Google Patents
Iron-promoted magnetic loading anaerobic reaction system Download PDFInfo
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- CN110590078A CN110590078A CN201910975671.2A CN201910975671A CN110590078A CN 110590078 A CN110590078 A CN 110590078A CN 201910975671 A CN201910975671 A CN 201910975671A CN 110590078 A CN110590078 A CN 110590078A
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 22
- 238000011068 loading method Methods 0.000 title claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000010802 sludge Substances 0.000 claims abstract description 82
- 238000004062 sedimentation Methods 0.000 claims abstract description 46
- 229910052742 iron Inorganic materials 0.000 claims abstract description 38
- 239000002131 composite material Substances 0.000 claims abstract description 25
- 239000000126 substance Substances 0.000 claims abstract description 22
- 238000000926 separation method Methods 0.000 claims abstract description 19
- 239000010865 sewage Substances 0.000 claims abstract description 8
- 150000001875 compounds Chemical class 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 230000005294 ferromagnetic effect Effects 0.000 claims description 40
- 239000006148 magnetic separator Substances 0.000 claims description 13
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical group [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 12
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 8
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 7
- 239000006228 supernatant Substances 0.000 claims description 7
- 229910021577 Iron(II) chloride Inorganic materials 0.000 claims description 6
- 101150027686 psaF gene Proteins 0.000 claims description 6
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 5
- 238000010008 shearing Methods 0.000 claims description 5
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 4
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 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
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 4
- 230000001737 promoting effect Effects 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- 230000006872 improvement Effects 0.000 claims description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 10
- 239000011574 phosphorus Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 8
- 230000004071 biological effect Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 9
- 238000007792 addition Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 244000005700 microbiome Species 0.000 description 7
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 230000000813 microbial effect Effects 0.000 description 3
- 230000020477 pH reduction Effects 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 2
- 108090000790 Enzymes Proteins 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 238000011112 process operation Methods 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002053 acidogenic effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000003834 intracellular effect Effects 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
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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]
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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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
- C02F3/28—Anaerobic digestion processes
-
- 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
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses an iron-promoted magnetic loading anaerobic reaction system, which relates to the technical field of sewage treatment and comprises an anaerobic reactor, a sedimentation tank and a magnetic seed separation system which are connected, wherein the anaerobic reactor is also connected with a compound iron system substance promotion adding system. Compared with the conventional anaerobic reactor, the anaerobic reactor has the advantages that the sludge concentration of the anaerobic reactor can be greatly improved, the sludge floc settling performance is enhanced, and the occupied area of the anaerobic reactor and a sedimentation tank is reduced; by adding the composite iron system promoter, the floc biological activity is promoted, the treatment effect of the anaerobic reactor is improved, and the system phosphorus removal effect can be enhanced; has the advantages of high treatment efficiency, reliable operation, convenient management, land occupation saving and the like.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an iron-promoted magnetic loading anaerobic reaction system.
Background
The anaerobic biological treatment technology is that under the condition of no aeration, the anaerobic microorganisms convert macromolecular organic pollutants into micromolecular organic matters or inorganic matters such as methane, water and the like by relying on the metabolism process of the anaerobic microorganisms. Has the following advantages: 1. the organic load is high, the process operation is simple, aeration is not needed, and methane can be generated; 2. can convert the organic pollutants which are difficult to degrade into easily degradable substances which can be utilized by microorganisms; 3. the anaerobic microorganisms have a longer generation time, and the excess sludge yield is small. Anaerobic biological treatment techniques have advantages that aerobic biological treatment techniques are not comparable, and are receiving increasing attention.
The anaerobic biological treatment process is generally divided into two stages of hydrolysis acidification (hydrolysis, acidogenic fermentation, hydrogen production and acetogenesis) and methanogenesis, wherein the methanogenesis stage is an important stage for realizing substrate removal, but methanogens grow slowly, are sensitive to the environment and have high requirements on substrates. The existing anaerobic biological treatment reactor technology can be divided into an upflow reactor and a complete mixing reactor, and the following problems are often existed: 1. the upflow reactor has strict requirements on the reactor hydraulic conditions such as the water inlet amount, the circulating water amount and the like and the water distribution mode, the operation management difficulty in the actual engineering is high, the problems of unstable working condition, the need of supplementing granular sludge, easy blockage of a water distribution device, difficult maintenance and the like easily occur; 2. sensitive to impact load of water quality and water quantity, easily causes accumulation of organic acid, and leads to failure of anaerobic biological treatment process; 3. the effluent water treated by anaerobic organisms often contains a large amount of suspended matters and colloids, and the subsequent treatment process is negatively influenced; 4. the completely mixed reactor has low requirements on hydraulic conditions, but has low sludge load, a large-area sedimentation tank needs to be constructed subsequently, the occupied area is greatly increased, and the sludge-water separation effect is still greatly influenced by the sludge properties.
Disclosure of Invention
Aiming at the technical problems, the invention discloses an iron-promoted magnetic loading anaerobic reaction system, which can greatly improve the sludge concentration of an anaerobic reactor and the sedimentation performance of sludge flocs so as to reduce the occupied area of the anaerobic reactor and a sedimentation tank compared with the conventional anaerobic reactor; by adding the composite iron system accelerator, the floc biological activity is promoted, the treatment effect of the anaerobic reactor is improved, and the dephosphorization effect of the system can be enhanced.
In order to achieve the purpose, the invention adopts the following technical scheme:
an iron-promoted magnetic loading anaerobic reaction system comprises an anaerobic reactor, a sedimentation tank and a magnetic seed separation system which are connected, wherein the anaerobic reactor is also connected with a compound iron system promotion adding system.
As a further optimization of the invention, the anaerobic reactor is provided with a water inlet, a sludge return inlet, a composite iron system substance adding inlet, an anaerobic mixed liquid outlet and a ferromagnetic powder recovering inlet; sewage enters the anaerobic reactor through a water inlet, a composite iron system substance adding inlet is connected with a composite iron system substance adding system, and composite iron system substances are added into the anaerobic reactor.
As a further preferred aspect of the present invention, an anaerobic agitator is further provided in the anaerobic reactor.
As a further preferred aspect of the present invention, the sedimentation tank is provided with a mixed liquor inlet, a supernatant discharge outlet and a sludge return outlet, the mixed liquor inlet is connected to the anaerobic mixed liquor outlet of the anaerobic reactor, and the sludge return outlet is connected to the sludge return inlet of the anaerobic reactor.
In a further preferred embodiment of the present invention, the bottom of the sedimentation tank is further provided with a sludge scraper and a sludge hopper, and the upper part of the sedimentation tank is further provided with an overflow weir.
As a further preferred aspect of the present invention, the sedimentation tank is one selected from the group consisting of a horizontal sedimentation tank, a vertical sedimentation tank, an inclined tube sedimentation tank, and a radial sedimentation tank.
As a further preferred aspect of the present invention, the sedimentation tank may be provided separately from the anaerobic reactor, or may be provided above the anaerobic reactor in a stacked manner.
As a further optimization of the invention, the magnetic seed separation system comprises a high shear and a magnetic separator, the magnetic seed separation system is 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 reactor, and the residual sludge inlet on the magnetic seed separation system is connected with a sludge return outlet on the sedimentation tank; the high shearing machine peels off ferromagnetic powder and residual sludge in part of the sludge containing ferromagnetic powder at the bottom of the sedimentation tank; the magnetic separator separates ferromagnetic powder from residual sludge; then the recovered ferromagnetic powder flows back to the anaerobic reactor, and the residual sludge is discharged out of the system.
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 improvement, the composite iron system promoter comprises ferroferric oxide powder, and the grain diameter of the added ferroferric oxide powder is 40-200 mu m; according to the difference of indexes of COD, total phosphorus, suspended matters and the like of 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 operation of the anaerobic reactor under different water inlet and outlet indexes.
The beneficial effect of the invention is that,
1. compared with the conventional anaerobic reactor, the activated sludge can be efficiently retained, the concentration of the activated sludge can reach 8000-20000mg/L, the concentration of the activated sludge can be improved by 2-3 times, and the impact resistance of the reactor is greatly improved;
2. the addition of the composite iron system promoting substances and the recovery of ferromagnetic powder can improve the agglomeration capacity of sludge flocs and improve the flocculation settleability of the sludge; the surface load of the sedimentation tank can reach 3.0-8.0m3/(m2·h)。
3. The sludge retention time is prolonged, the living environment of microorganisms is improved, and the microbial diversity in the reactor is improved;
4. addition of complex iron-based promoters, e.g. Fe0、Fe2+、Fe3+All can be madeThe electron donor or acceptor participates in the oxidation or reduction process of nitrogen; with Fe3+For example, Fe (III) reducing bacteria can be enriched, participate in the decomposition of complex organic matters through the reduction process of dissimilatory iron, can obviously strengthen the conversion of complex substrates into small-molecular organic acids or alcohols, and improve the hydrolysis acidification efficiency of the complex substrates.
5. Addition of complex iron-based promoters, e.g. Fe0、Fe2+、Fe3+The essential iron element of microbial cells can be increased, and the growth and the propagation of anaerobic microorganisms are promoted; and promote the synthesis of intracellular enzyme, improve the enzyme activity, thereby improving the microbial activity.
6. Addition of complex iron-based promoters, e.g. Fe0、Fe2+、Fe3+The structure of the sludge is compact, the flocculation sedimentation performance of the sludge is improved, and the removal of system phosphorus is enhanced.
7. Addition of complex iron-based promoters, e.g. Fe0、Fe2+、Fe3+All can control S in situ2-、H2S poison methanogens.
8. The magnetic separation system recovers ferromagnetic powder in the residual sludge, and reduces the operation cost.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of the embodiment.
Wherein, 1-water inlet pipe; 2-an anaerobic reactor; 3-anaerobic agitator; 4-a guide cylinder; 5-a mud scraper; 6-a mudguard; 7-collecting the canal; 8-water outlet pipe; 9-sludge reflux pump; 10-high shear; 11-a magnetic separator; 12-recovery of ferromagnetic powder replenishing pipes; 13-excess sludge discharge pipe; 14-a compound iron system addition promoting system; 15-sludge bucket; 16-a sedimentation tank; and 17-water distribution and water inlet pipe.
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
As shown in figure 1, the iron-promoted magnetic loading anaerobic reaction system comprises an anaerobic reactor, a sedimentation tank and a magnetic seed separation system which are connected, wherein the anaerobic reactor is also connected with a compound iron system substance promotion adding system.
Particularly, the anaerobic reactor is provided with 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; sewage enters the anaerobic reactor through a water inlet, a composite iron system substance adding inlet is connected with a composite iron system substance adding system, and composite iron system substances are added into the anaerobic reactor.
Particularly, an anaerobic stirrer is further arranged in the anaerobic reactor and used for uniformly stirring.
Particularly, the sedimentation tank is provided with a mixed liquid inlet, a supernatant liquid discharge outlet and a sludge backflow outlet, the mixed liquid inlet is connected with an anaerobic mixed liquid outlet on the anaerobic reactor, the sludge backflow outlet is connected with a sludge backflow inlet on the anaerobic reactor, and after the anaerobic mixed liquid is subjected to mud-water separation in the sedimentation tank, supernatant liquid is discharged from the supernatant liquid outlet.
Particularly, the bottom of the sedimentation tank is also provided with a mud scraper and a sludge hopper, and the upper part of the sedimentation tank is also provided with an overflow weir.
Particularly, the sedimentation tank is a vertical flow sedimentation tank.
Particularly, the sedimentation tank can be arranged separately from the anaerobic reactor or can be arranged above the anaerobic reactor in a superposed manner.
Particularly, the magnetic seed separation system comprises a high shear and a magnetic separator, wherein the magnetic seed separation system is 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 reactor, and the residual sludge inlet on the magnetic seed separation system is connected with a sludge return outlet on the sedimentation tank; the high shear can peel off ferromagnetic powder and residual sludge in part of the sludge containing ferromagnetic powder collected at the bottom of the sedimentation tank; the magnetic separator can separate ferromagnetic powder from residual sludge.
One part of the sludge containing the ferromagnetic powder flows back to the anaerobic reactor, the other part of the sludge containing the ferromagnetic powder is separated by a high shear and a magnetic separator, the ferromagnetic powder and the residual sludge are separated, the recovered ferromagnetic powder flows back to the anaerobic reactor, and the residual sludge is discharged out of the system.
In particular, the complex iron-based accelerator is selected from ferroferric oxide powder (Fe)3O4)、FeCl2Wherein the particle size of the ferroferric oxide powder is 40-200 mu m; according to the different indexes of COD, total phosphorus, suspended matters and the like of the inlet and outlet water, FeCl2The adding and the proportion are adjusted accordingly, so as to meet the requirement of stable operation of the anaerobic reactor under different water inlet and outlet indexes.
The invention is used for treating sewage, and specifically comprises the following steps:
(1) degradation of pollutants
The sewage enters an anaerobic reactor, organic substances in the sewage are biodegraded under the action of microorganisms in the anaerobic reactor, and part of organic substances which are difficult to degrade are decomposed into micromolecular organic substances; the addition of the composite iron system promoter and the recovery of the ferromagnetic powder can greatly improve the sludge concentration and the impact load resistance, and simultaneously has the functions of relieving the acidification of the reactor and strengthening the chemical phosphorus removal of the system.
(2) Mud-water separation
After the sludge containing the ferromagnetic powder is precipitated in a sedimentation tank, separating mud from water; supernatant is discharged from a supernatant discharge outlet, one part of the sludge containing the ferromagnetic powder flows back to the anaerobic reactor, and the other part is discharged to a magnetic seed separation system.
(3) Magnetic mud separation
The sludge containing the ferromagnetic powder flowing to the magnetic seed separation system is stripped from the residual sludge and the ferromagnetic powder under the action of a high shear; then under the action of a magnetic separator, the residual sludge and ferromagnetic powder are separated; and returning the recovered ferromagnetic powder to the anaerobic reactor, and discharging the separated residual sludge out of the system.
Example 2
The difference from example 1 is that:
the sedimentation tank is an inclined tube sedimentation tank.
The composite iron-based accelerator is ferroferric oxide powder (Fe)3O4) And the Polymeric Ferric Sulfate (PFS) is added and the proportion is adjusted according to different indexes of COD, total phosphorus, suspended matters and the like of the inlet and outlet water so as to meet the requirement of stable operation of the anaerobic reactor under different indexes of the inlet and outlet water.
Example 3
The difference from example 1 is that:
the sedimentation tank is a horizontal flow sedimentation tank.
The composite iron-based accelerator is ferroferric oxide powder (Fe)3O4)、FeCl3And polyaluminum ferric silicate (PSAF), FeCl according to the different indexes of COD, total phosphorus, suspended matters and the like of inlet and outlet water3And the adding and the proportion of the polymeric aluminum ferric silicate (PSAF) are adjusted accordingly so as to meet the requirement of stable operation of the anaerobic reactor under different water inlet and outlet indexes.
Examples
As shown in fig. 2, an iron-promoted magnetic loading anaerobic reaction system comprises an anaerobic reactor 2, a sedimentation tank 16, a high shear machine 10, a magnetic separator 11 and a composite iron system promoter adding system 14;
the anaerobic reactor 2 is connected with the water inlet pipe 1, the anaerobic stirrer 3 is arranged in the anaerobic reactor 2, and the composite iron system substance-promoting feeding system 14 is arranged above the anaerobic reactor 2.
The bottom of the sedimentation tank 16 is provided with a sludge hopper 15, the sludge hopper 15 is provided with a sludge scraper 5, the guide cylinder 4 is arranged at the middle upper part of the sedimentation tank 16, the anaerobic reactor 2 is connected with the guide cylinder 4 through a water distribution and inlet pipe 17, the periphery of the upper part of the guide cylinder 4 is provided with two groups of connected splash guards 6 and water collecting channels 7, the water collecting channels 7 are communicated with a water outlet pipe 8, and the sludge hopper 15 is also connected with a sludge reflux pump 9; a water outlet pipe of the sludge reflux pump 9 is divided into two paths, and the two paths are regulated and controlled through the opening degree of a valve, one path is connected with the anaerobic reactor 2, the other path is connected with a high shearing machine 10, the high shearing machine 10 is connected with a magnetic separator 11, and the high shearing machine 10 and the magnetic separator 11 are both arranged above a sedimentation tank 16; the ferromagnetic powder separated by the magnetic separator 11 flows into the anaerobic reactor 2 through the recovery ferromagnetic powder replenishing pipe 12, and the separated excess sludge is discharged out of the system through the excess sludge discharge pipe 13.
In a certain wastewater treatment project, the treatment effect of an anaerobic reaction tank is poor due to large fluctuation of the quality of inlet water, and a certain rancidity phenomenon exists, so that the stable operation of a subsequent A/O process is seriously influenced; an iron-promoted magnetic loading anaerobic reaction system is used as a pilot plant process route to treat the wastewater; the pilot plant design water volume is 100m3The specific data are shown in the following table:
note: the data are the average water inlet and outlet quality and the operation parameters of the system
Pair of CODcr and BOD of iron-promoted magnetic-loaded anaerobic reaction system5The removal rates of ammonia nitrogen and total phosphorus are 66.62%, 56.23%, 23.53% and 62.35% respectively, and all effluent indexes are superior to those of effluent of a traditional anaerobic reaction tank.
Compared with the traditional anaerobic reactor, the iron-promoted magnetic loading anaerobic reaction system has the following remarkable effects:
1. the activated sludge can be efficiently retained, the concentration of the activated sludge in the traditional completely mixed anaerobic reaction tank is 4000-; wherein, the COD removal rate is improved by 20 percent.
2. By adding the composite iron system accelerator into the anaerobic reactor 2, the total phosphorus can be effectively removed in the anaerobic reactor 2, and the difficulty of subsequent chemical phosphorus removal is reduced.
3. The specific gravity of sludge flocs is increased by adding composite iron system promoting substances and recovering ferromagnetic powder, so that the surface load of the sludge settling property can be improved to 3-8m3/(m2H), the occupied area of the sedimentation tank is greatly reduced,and the civil engineering investment cost is reduced.
4. The system has no strict requirements on water distribution requirements, process operation and operation management; the process equipment can be controlled in a linkage manner to realize unattended operation.
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 (10)
1. An iron-promoted magnetic loading anaerobic reaction system is characterized by comprising an anaerobic reactor, a sedimentation tank and a magnetic seed separation system which are connected, wherein the anaerobic reactor is also connected with a compound iron system substance promotion adding system.
2. The anaerobic reaction system with iron-promoted magnetic loading according to claim 1, wherein the anaerobic reactor is provided with a water inlet, a sludge return inlet, a composite iron system promoter adding inlet, an anaerobic mixed liquor outlet and a ferromagnetic powder recovery inlet; sewage enters the anaerobic reactor through a water inlet, a composite iron system substance adding inlet is connected with a composite iron system substance adding system, and composite iron system substances are added into the anaerobic reactor.
3. The iron-promoted magnetic loading anaerobic reaction system as claimed in claim 2, wherein an anaerobic stirrer is further provided in the anaerobic reactor.
4. The anaerobic reaction system with iron-promoted magnetic loading according to claim 1, wherein the settling tank is provided with a mixed liquor inlet, a supernatant discharge outlet and a sludge return outlet, the mixed liquor inlet is connected with the anaerobic mixed liquor outlet on the anaerobic reactor, and the sludge return outlet is connected with the sludge return inlet on the anaerobic reactor.
5. The anaerobic reaction system with iron-promoted magnetic loading as claimed in claim 4, wherein the bottom of the sedimentation tank is further provided with a mud scraper and a sludge hopper, and the upper part of the sedimentation tank is further provided with an overflow weir.
6. The anaerobic reactor system with iron-promoted magnetic loading according to claim 5, wherein the settling tank is one selected from the group consisting of an advection-type settling tank, a vertical-type settling tank, a tube-chute settling tank and a radial-type settling tank.
7. The anaerobic reaction system with iron-promoted magnetic loading according to claim 6, wherein the sedimentation tank can be arranged separately from the anaerobic reactor or can be arranged above the anaerobic reactor in an overlapping manner.
8. The anaerobic reactor system with iron-promoted magnetic loading 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 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 reactor, and the residual sludge inlet on the magnetic seed separation system is connected with a sludge return outlet on the sedimentation tank; the high shearing machine peels off ferromagnetic powder and residual sludge in part of the sludge containing ferromagnetic powder at the bottom of the sedimentation tank; the magnetic separator separates ferromagnetic powder from residual sludge; then the recovered ferromagnetic powder flows back to the anaerobic reactor, and the residual sludge is discharged out of the system.
9. The system of claim 2, wherein the composite 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).
10. An iron as claimed in claim 9The system for promoting the magnetic loading anaerobic reaction is characterized in that as a further improvement, the composite iron system promoter comprises ferroferric oxide powder, and the grain size of the added ferroferric oxide powder is 40-200 mu m; according to different water inlet and outlet indexes, 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 operation of the anaerobic reactor under different water inlet and outlet indexes.
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