CN108046477B - Equipment for simultaneously removing COD and total phosphorus - Google Patents
Equipment for simultaneously removing COD and total phosphorus Download PDFInfo
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- CN108046477B CN108046477B CN201711448457.9A CN201711448457A CN108046477B CN 108046477 B CN108046477 B CN 108046477B CN 201711448457 A CN201711448457 A CN 201711448457A CN 108046477 B CN108046477 B CN 108046477B
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- tower
- sewage
- premixing
- packing
- pump
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 28
- 239000011574 phosphorus Substances 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 78
- 239000010865 sewage Substances 0.000 claims abstract description 75
- 238000012856 packing Methods 0.000 claims abstract description 40
- 239000000945 filler Substances 0.000 claims abstract description 31
- 230000003197 catalytic effect Effects 0.000 claims abstract description 26
- 238000011010 flushing procedure Methods 0.000 claims description 31
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229960004887 ferric hydroxide Drugs 0.000 claims description 9
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 claims description 9
- 239000003054 catalyst Substances 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 abstract description 12
- 239000007800 oxidant agent Substances 0.000 abstract description 11
- DJFBJKSMACBYBD-UHFFFAOYSA-N phosphane;hydrate Chemical compound O.P DJFBJKSMACBYBD-UHFFFAOYSA-N 0.000 abstract description 2
- 239000000126 substance Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000003344 environmental pollutant Substances 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- 239000004115 Sodium Silicate Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 6
- UMPKMCDVBZFQOK-UHFFFAOYSA-N potassium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[K+].[Fe+3] UMPKMCDVBZFQOK-UHFFFAOYSA-N 0.000 description 6
- 239000010802 sludge Substances 0.000 description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 6
- 229910052911 sodium silicate Inorganic materials 0.000 description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 5
- 238000006555 catalytic reaction Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- 229910052708 sodium Inorganic materials 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 229910019142 PO4 Inorganic materials 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- JFTTYFWNHKVEMY-UHFFFAOYSA-N barium ferrate Chemical group [Ba+2].[O-][Fe]([O-])(=O)=O JFTTYFWNHKVEMY-UHFFFAOYSA-N 0.000 description 4
- 235000014413 iron hydroxide Nutrition 0.000 description 4
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 4
- 239000010452 phosphate Substances 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- 239000005955 Ferric phosphate Substances 0.000 description 3
- 102000005393 Sodium-Potassium-Exchanging ATPase Human genes 0.000 description 3
- 108010006431 Sodium-Potassium-Exchanging ATPase Proteins 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 229940032958 ferric phosphate Drugs 0.000 description 3
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 3
- 238000004659 sterilization and disinfection Methods 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- 229910052707 ruthenium Inorganic materials 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- CUPCBVUMRUSXIU-UHFFFAOYSA-N [Fe].OOO Chemical compound [Fe].OOO CUPCBVUMRUSXIU-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000004332 deodorization Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 159000000014 iron salts Chemical class 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 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
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 229910021519 iron(III) oxide-hydroxide Inorganic materials 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
- C02F2209/18—PO4-P
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
- Catalysts (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention belongs to the field of water treatment. Specifically, the invention provides equipment for simultaneously removing COD and total phosphorus, which comprises at least one sewage treatment unit, wherein the sewage treatment unit comprises a packing tower and premixing equipment, the top of the packing tower is provided with a water inlet, the bottom of the packing tower is provided with a water outlet, catalytic packing is arranged in the packing tower, the premixing equipment comprises a dosing tank, a quantitative pump, a sewage lifting pump and a premixing tank, the premixing tank is connected with the sewage lifting pump through a pipeline, the dosing tank is communicated with the premixing tank through the quantitative pump, and the premixing tank is communicated with the water inlet of the packing tower through a pipeline. The device utilizes the novel combination of the oxidant and the catalytic filler to achieve the aim of removing COD while removing phosphorus efficiently, and the yielding water phosphorus can reach three water standards of the earth surface.
Description
Technical Field
The invention belongs to the field of water treatment, and particularly relates to equipment for simultaneously removing COD and total phosphorus.
Background
COD, total nitrogen and total phosphorus are three common pollutants in sewage. Usually, urban sewage treatment plants all adopt a biological treatment-activated sludge technology, and pollutants are degraded and removed through the action of microorganisms. However, the effect of microorganisms on phosphorus removal is very limited, the phosphorus removal rate is only 60% -70%, and the stable water outlet standard requirement of 0.5mg/L cannot be met, so that strengthening measures are needed to be adopted, and a chemical module is added to strengthen the phosphorus removal effect. Chemical phosphorus removal is to add chemical agents to form insoluble phosphate precipitates, and then remove phosphorus from sewage through precipitation. The agents used for chemical phosphorus removal are mainly: aluminum salts (e.g., aluminum sulfate, aluminum chloride), calcium salts, and iron salts (e.g., ferric trichloride, ferric sulfate, ferrous sulfate), polymeric coagulants, flocculants (e.g., PAC, PAM), and the like. The dosage of the preparation is about 60-200mg/L, and a large amount of sludge is generated to cause secondary pollution, so that the sludge treatment is difficult and the cost is high.
Disclosure of Invention
The invention aims to solve the technical problem of providing equipment for simultaneously removing COD and total phosphorus, so that the aim of removing COD while removing phosphorus efficiently is fulfilled, and the yielding water phosphorus can reach three water standards of the earth surface.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: an apparatus for simultaneously removing COD and total phosphorus comprises at least one sewage treatment unit, wherein the sewage treatment unit comprises a packed tower and a premixing device,
the top of the packed tower is provided with a water inlet, the bottom of the packed tower is provided with a water outlet, the packed tower is internally provided with catalytic packing,
the premixing equipment comprises a dosing tank, a quantitative pump, a sewage lifting pump and a premixing groove, wherein the premixing groove is connected with the sewage lifting pump through a pipeline, the dosing tank is communicated with the premixing groove through the quantitative pump, and the premixing groove is communicated with a water inlet of the packing tower through a pipeline.
The function principle of the device is as follows: and after the oxidant and the sewage are mixed and reacted in the premixing tank, the mixture enters the packed tower through the water inlet to perform steps of catalysis, adsorption, filtration and the like, and then is discharged through the water outlet.
Based on the technical scheme, the invention can be further specifically selected or optimally selected as follows.
Specifically, the weight percentage of the catalytic filler is as follows: 60-80% of active carbon, 10-30% of ferric hydroxide and 5-10% of metal catalyst.
Preferably, the dosing tank is provided with an oxidant, and the oxidant is ferrate.
The function principle of the device is as follows: after the ferrate and the sewage are mixed and reacted in the premixing tank, the ferrate and the sewage enter the packed tower through the water inlet to perform catalytic reaction, are adsorbed and filtered, and are discharged through the water outlet. Ferrate is as active ingredient (FeO) 4 ) 2- Has strong oxidizing property, and has oxidation, sterilization, flocculation and deodorization effects. The ferrate is easy to have oxidation-reduction reaction with organic matters in water, so as to achieve the aim of removing COD, and Fe is generated at the same time 3+ Easy hydrolysis, producing Fe (OH) 3 The iron hydroxide is filtered and enriched on the surface of the filler by a filter material to supplement the consumption of the inherent component iron hydroxide in the filler, and the iron hydroxide reacts with phosphate under the catalysis of a catalyst: fe (OH) 3 +H 2 PO 4 - +H + →FePO 4 +3H 2 O, the post-ferric phosphate is filtered and adsorbed by the modified filler. The COD and TP can be removed simultaneously. And because of the adsorption and filtration effects of the modified filler, the dosage of the medicament is greatly reduced, and no sludge is generated.
Specifically, the packing height of the packed tower is less than or equal to 70% of the packing tower height.
Preferably, the ferrate is barium ferrate, sodium ferrate, or potassium ferrate.
Specifically, a stabilizing additive such as sodium silicate is also added into the dosing tank.
Specifically, the metal catalyst is simple substances such as manganese, platinum, palladium, rhodium, silver, ruthenium, titanium and the like, or compounds such as manganese dioxide, palladium chloride and the like.
Preferably, the particle size of the filler in the filler tower is 0.5-1.2mm, the non-uniformity coefficient is less than or equal to 1.7, and the specific surface area is 1000-2000m 2 /g。
Specifically, the back flushing device comprises a cleaning pump and a clear water tank, a back flushing water inlet is formed in the bottom of the packed tower, a back flushing water outlet is formed in the top of the packed tower, one end of the flushing pump is communicated with the clear water tank, and the other end of the flushing pump is communicated with the back flushing water inlet of the packed tower.
The back flushing device is controlled by an electric control system.
The back flushing device can prevent the catalytic packed tower from being blocked by polluted particles, the resistance of the filter is increased, and the flow is reduced. The back flushing period is 2-6d, and the back flushing time is 15-30min, and is controlled by an electric control system.
The device for simultaneously removing COD and total phosphorus can be used in a superposition way, and the treated sewage is catalyzed by adding an oxidant into a secondary packed tower again to form a multi-stage catalytic device.
The utility model provides a device for simultaneously getting rid of COD and total phosphorus, the quantity of sewage treatment unit is two, and one of them sewage treatment unit the delivery port of packing tower with another sewage treatment unit the sewage elevator pump passes through the pipeline intercommunication.
The function principle of the device is as follows: under the condition of higher requirements on the sewage treatment degree, the multistage sewage treatment equipment is used, so that the sewage deep treatment is facilitated. And (3) mixing the oxidant and the sewage discharged from the first water outlet in a second premixing tank for reaction, then allowing the mixed sewage to enter a second packing tower through a second water inlet for catalytic reaction, performing adsorption filtration, and then discharging the mixed sewage through a second water outlet.
In addition, the invention also provides a method for simultaneously removing COD and total phosphorus, which comprises the following steps:
1) Pre-mixing sewage and an oxidant for reaction;
2) Conveying the reacted mixture to a packed tower through a pipeline for catalytic reaction, and adsorbing and filtering;
wherein, the weight percentage of the catalytic filler in the filler tower is as follows: 60-80% of active carbon, 10-30% of ferric hydroxide and 5-10% of metal catalyst.
Specifically, the packing height of the packed tower is less than or equal to 70% of the packing tower height.
Preferably, the oxidizing agent is ferrate, and the ferrate is barium ferrate, sodium ferrate, or potassium ferrate.
In particular, stabilizing aids, such as sodium silicate, are also added to the reaction mixture.
Specifically, the metal catalyst is simple substances such as manganese, platinum, palladium, rhodium, silver, ruthenium, titanium and the like, or compounds such as manganese dioxide, palladium chloride and the like.
Preferably, the particle size of the filler in the filler tower is 0.5-1.2mm, the non-uniformity coefficient is less than or equal to 1.7, and the specific surface area is 1000-2000m 2 /g。
Specifically, the method also comprises a back flushing step, and the clear water flushes the filler in the filler tower at a high speed along the reverse direction of the sewage flow direction, thereby playing a role in back flushing. The back flushing step can prevent the catalytic packed tower from being blocked by polluted particles, the resistance of the filter is increased, and the flow is reduced. The back flushing period is 2-6d, and the back flushing time is 15-30min, and is controlled by an electric control system.
Compared with the prior art, the invention has the beneficial effects that: through the cooperation of the oxidant and the catalytic filler, on one hand, the performance of oxidizing and decomposing organic matters by using the strong oxidant (ferrate) is utilized, the ferrate is hydrolyzed while removing the COD (chemical oxygen demand) of the organic matters in the sewage, so that the oxyhydroxide of iron is generated, and the oxyhydroxide of iron reacts with phosphate to generate ferric phosphate flocs; on the other hand, the modified filler has the functions of large specific surface area and strong adsorption capacity, and can filter and adsorb unreacted phosphate and ferric phosphate completely. The filler is modified and filled with ferric hydroxide and a supported metal catalyst, so that the chemical reaction is effectively accelerated, and the reaction time is shortened by about 10 times compared with the conventional chemical precipitation dephosphorization method. Ferrate is oxidatively decomposed and a portion of the iron oxyhydroxide produced by hydrolysis is available to supplement the iron hydroxide in the filler. The filtering adsorption dephosphorization effect of ferrate and the filler is combined, so that the dosage of the medicament is reduced, the dosage is only about 1% of the dosage of the traditional chemical dephosphorization process, and no sludge is generated.
Drawings
FIG. 1 is a schematic diagram of an apparatus for simultaneous removal of COD and total phosphorus according to the present invention.
Fig. 2 is a schematic diagram of a multistage catalytic embodiment of an apparatus for simultaneously removing COD and total phosphorus according to the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. a dosing box; 2. a sewage lifting pump; 3. a premixing tank; 4. a packed tower; 5. a clean water tank; 6. a fixed displacement pump; 7. a cleaning pump; 10. the equipment is discharged; 20. back flushing water into water; 21. back flushing water and discharging water; 31. a first premix tank; 41. a first packed column; 32. a second premix tank; 42. and a second packed column.
Detailed Description
For a better understanding of the present invention, the content of the present invention will be further elucidated with reference to the drawings and the specific examples, but the content of the present invention is not limited to the following examples.
As shown in fig. 1, the present invention provides an apparatus for simultaneously removing COD and total phosphorus, comprising at least one sewage treatment unit comprising a packed column 4 and a premixing device,
the top of the packed tower 4 is provided with a water inlet, the bottom is provided with a water outlet, the packed tower 4 is internally provided with catalytic packing,
the premixing equipment comprises a dosing tank 1, a quantitative pump 6, a sewage lifting pump 2 and a premixing tank 3, wherein the premixing tank 3 is connected with the sewage lifting pump 2 through a pipeline, the dosing tank 1 is communicated with the premixing tank 3 through the quantitative pump 6, and the premixing tank 3 is communicated with a water inlet of the packing tower 4 through a pipeline.
As shown in fig. 2, the present invention provides an apparatus for simultaneously removing COD and total phosphorus, wherein the number of the sewage treatment units is two, and the water outlet of the packing tower of one of the sewage treatment units is connected with the sewage lifting pump of the other sewage treatment unit through a pipeline.
Specifically, the back flushing device comprises a cleaning pump and a clear water tank, a back flushing water inlet is formed in the bottom of the packed tower, a back flushing water outlet is formed in the top of the packed tower, one end of the flushing pump is communicated with the clear water tank, and the other end of the flushing pump is communicated with the back flushing water inlet of the packed tower.
Compared with the prior art, the invention has the advantages that:
(1) The novel method for high-efficiency decarburization and dephosphorization is formed by combining an oxidant and a catalytic filler, and the total phosphorus of the yielding water can reach three water standards (less than or equal to 0.3 m/L) of the surface;
(2) The dosage of the medicament is very small, and the running cost is greatly reduced;
(3) No sludge, no secondary pollution, and additional removal of organic matters, disinfection and sterilization.
Example 1:
as shown in fig. 1, a certain sewage is lifted into a premixing tank 3 by a sewage lifting pump 2, barium ferrate is stored by a dosing tank 1 and is conveyed into the premixing tank 3 by a quantitative pump 6, the sewage reacts with the barium ferrate in the premixing tank 3, the sewage enters a catalytic packing tower 4 through a water inlet after the reaction, and a certain volume of modified packing is filled in the catalytic packing tower 4, wherein the modified packing comprises the following components in percentage by mass: 60% of activated carbon, 30% of ferric hydroxide and 10% of manganese dioxide. The filler adsorbs and filters to remove pollutants, and the treated water is discharged through the water outlet.
The device and the method for simultaneously removing COD and total phosphorus provided by the invention are used for carrying out advanced treatment on the sewage treated by the sewage treatment plant, so that the water quality is obviously improved. The specific sewage treatment effect is shown in the following table:
| project | COD(mg/L) | TP(mg/L) |
| Water quality of inlet water | 50-60 | 0.5-2.5 |
| The invention relates to the quality of effluent | ≤30 | ≤0.1 |
| The removal rate of the invention | 50％ | 90％ |
Example 2:
as shown in fig. 2, a certain domestic sewage is lifted into a first premixing tank 31 by a sewage lifting pump, sodium ferrate is stored by a dosing tank 1, a stabilizing additive sodium silicate is further added into the dosing tank 1, the stabilizing additive sodium silicate is conveyed into the first premixing tank 31 by a quantitative pump 6, the sewage reacts with the sodium ferrate in the first premixing tank 31, the reacted sewage enters a first catalytic packing tower 41 through a water inlet, and a certain volume of modified packing is filled in the first catalytic packing tower, wherein the modified packing comprises the following components in percentage by mass: 60% of active carbon, 30% of ferric hydroxide and 10% of silver simple substance. The filler adsorbs and filters to remove pollutants, and the treated water is discharged through the water outlet. The sewage discharged from the water outlet is lifted into the second premixing tank 32 through the sewage lifting pump again, sodium ferrate is stored by the dosing tank 1 and is conveyed into the second premixing tank 32 through the dosing pump 6, the sewage reacts with the sodium ferrate in the second premixing tank 32, the sewage enters the second catalytic tower 42 through the water inlet after the reaction, and a certain volume of modified filler is filled in the second catalytic filler tower 42, wherein 70% of activated carbon, 20% of ferric hydroxide and 10% of titanium simple substance are filled in the second catalytic filler tower. The packing is adsorbed and filtered to remove pollutants, and the treated water is subjected to equipment water outlet 10 through a water outlet.
Compared with the sewage treated by the conventional method of a sewage treatment plant, the water quality of the sewage treated by the method is obviously improved. The specific sewage treatment effect is shown in the following table:
example 3:
as shown in fig. 2, the cultivation wastewater is lifted into the premixing tank by the sewage lifting pump, potassium ferrate is stored by the dosing tank 1, stable auxiliary sodium silicate is further added into the dosing tank 1, the stable auxiliary sodium silicate is conveyed into the first premixing tank 31 by the quantitative pump 6, the sewage reacts with the potassium ferrate in the first premixing tank 31, the reacted sewage enters the first catalytic packing tower 41 through the water inlet, and a certain volume of modified packing is filled in the first catalytic packing tower 41, wherein the modified packing comprises the following components in percentage by mass: 80% of active carbon, 10% of ferric hydroxide and 10% of manganese simple substance. The filler adsorbs and filters to remove pollutants, and the treated water is discharged through the water outlet. The sewage discharged from the water outlet is lifted into a second premixing tank 32 by a sewage lifting pump, potassium ferrate is stored by a dosing tank 1 and is conveyed into the second premixing tank 32 by a dosing pump 6, the sewage reacts with the potassium ferrate in the second premixing tank 32, the reacted sewage enters a second catalytic filler tower 42 through a water inlet, and a certain volume of modified filler is filled in the second catalytic filler tower 42, wherein the active carbon is 70%, the ferric hydroxide is 25% and the silver simple substance is 5%. The packing is adsorbed and filtered to remove pollutants, and the treated water is subjected to equipment water outlet 10 through a water outlet.
In addition, every 2 days, the clean water in the clean water tank 5 is subjected to backwash water 20 by the cleaning pump 7, which flushes the packing in the packing towers 41 and 42 at a high speed in the reverse direction to the sewage flow direction, followed by backwash water outlet 21. The back flushing step prevents the catalytic packed columns 41 and 42 from being clogged with contaminating particles, increasing the filter resistance and reducing the flow rate. The back flushing time is 15-30min, and is controlled by an electric control system.
Compared with the sewage treated by the conventional method of a sewage treatment plant, the water quality of the sewage treated by the method is obviously improved. The specific sewage treatment effect is shown in the following table:
the foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (4)
1. The device for simultaneously removing COD and total phosphorus is characterized by comprising at least one sewage treatment unit, wherein the sewage treatment unit comprises a packed tower (4) and premixing equipment,
the top of the packed tower (4) is provided with a water inlet, the bottom is provided with a water outlet, the packed tower (4) is internally provided with catalytic packing,
the premixing equipment comprises a dosing tank (1), a quantitative pump (6), a sewage lifting pump (2) and a premixing groove (3), wherein the premixing groove (3) is connected with the sewage lifting pump (2) through a pipeline, the dosing tank (1) is communicated with the premixing groove (3) through the quantitative pump (6), and the premixing groove (3) is communicated with a water inlet of the filling tower (4) through a pipeline;
ferrate is arranged in the dosing tank (1), and the weight percentage of catalytic filler in the filler tower (4) is as follows: 60-80% of active carbon, 10-30% of ferric hydroxide and 5-10% of metal catalyst.
2. The apparatus for simultaneous removal of COD and total phosphorus as defined in claim 1, wherein: the packing height of the packed tower is less than or equal to 70% of the packing tower height.
3. The apparatus for simultaneous removal of COD and total phosphorus as defined in claim 1, wherein: the back flushing device comprises a cleaning pump and a clean water tank, a back flushing water inlet is arranged at the lower end of the packing tower, a back flushing water outlet is arranged at the upper end of the packing tower, one end of the flushing pump is communicated with the clean water tank, and the other end of the flushing pump is communicated with the back flushing water inlet of the packing tower.
4. A device for simultaneous removal of COD and total phosphorus according to any of claims 1-3, wherein: the number of the sewage treatment units is two, and the water outlet of the packing tower (4) of one sewage treatment unit is communicated with the sewage lifting pump (2) of the other sewage treatment unit through a pipeline.
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