CN114380362B - Device and method for synchronously removing nitrogen and phosphorus and realizing productivity - Google Patents
Device and method for synchronously removing nitrogen and phosphorus and realizing productivity Download PDFInfo
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- CN114380362B CN114380362B CN202210143507.7A CN202210143507A CN114380362B CN 114380362 B CN114380362 B CN 114380362B CN 202210143507 A CN202210143507 A CN 202210143507A CN 114380362 B CN114380362 B CN 114380362B
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- phosphorus
- magnesium anode
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 74
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 37
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 37
- 239000011574 phosphorus Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 88
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 81
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 81
- 239000011777 magnesium Substances 0.000 claims abstract description 81
- CKMXBZGNNVIXHC-UHFFFAOYSA-L ammonium magnesium phosphate hexahydrate Chemical compound [NH4+].O.O.O.O.O.O.[Mg+2].[O-]P([O-])([O-])=O CKMXBZGNNVIXHC-UHFFFAOYSA-L 0.000 claims abstract description 15
- 229910052567 struvite Inorganic materials 0.000 claims abstract description 15
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims abstract description 10
- -1 ammonium ions Chemical class 0.000 claims abstract description 10
- 229910001425 magnesium ion Inorganic materials 0.000 claims abstract description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 9
- 238000010521 absorption reaction Methods 0.000 claims description 35
- 239000000047 product Substances 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 239000003792 electrolyte Substances 0.000 claims description 33
- 238000001816 cooling Methods 0.000 claims description 29
- 238000007790 scraping Methods 0.000 claims description 27
- 238000004804 winding Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 8
- 238000002161 passivation Methods 0.000 claims description 7
- 239000002244 precipitate Substances 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 claims description 4
- 238000012163 sequencing technique Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 239000011295 pitch Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 abstract description 16
- 230000005611 electricity Effects 0.000 abstract description 4
- 238000001556 precipitation Methods 0.000 abstract description 2
- 229940079593 drug Drugs 0.000 abstract 1
- 239000003814 drug Substances 0.000 abstract 1
- 238000011065 in-situ storage Methods 0.000 abstract 1
- 210000005056 cell body Anatomy 0.000 description 10
- 238000003756 stirring Methods 0.000 description 5
- 238000004064 recycling Methods 0.000 description 4
- 230000029087 digestion Effects 0.000 description 3
- 235000003170 nutritional factors Nutrition 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000009825 accumulation Methods 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
- 239000003181 biological factor Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009466 transformation Effects 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/18—Alkaline earth metal compounds or magnesium 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4618—Supplying or removing reactants or electrolyte
-
- 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
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- 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
- C02F2303/14—Maintenance of water treatment installations
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a device and a method for synchronously removing nitrogen and phosphorus and realizing productivity. In the reaction process, the magnesium anode loses electrons to become soluble magnesium ions due to potential difference, and the magnesium ions, phosphate ions and ammonium ions in the wastewater generate struvite precipitation; electrons lost by the magnesium anode are transmitted to the air cathode through an external lead so as to generate electricity. According to the invention, magnesium ions generated in situ by the magnesium electrode are used for denitrification and dephosphorization, so that the denitrification and dephosphorization of the wastewater are realized on the premise of not adding other medicines, and meanwhile, nitrogen and phosphorus resources and electric energy in the wastewater can be recovered.
Description
Technical Field
The invention relates to the technical field of ammonia nitrogen and phosphorus-containing wastewater treatment, in particular to a device and a method for synchronously removing nitrogen and phosphorus and realizing productivity.
Background
The water eutrophication index is of three types: environmental factors, biological factors and nutritional factors, wherein the nutritional factors are the root cause of eutrophication of water, and among the nutritional factors, nitrogen and phosphorus elements are the most influential ones, wherein the influence of nitrogen elements is particularly remarkable. How to remove nitrogen and phosphorus in the wastewater and recycle the nitrogen and phosphorus is a technical problem to be solved urgently by the person skilled in the art.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a device and a method for synchronously removing nitrogen and phosphorus and realizing productivity.
The technical scheme adopted by the invention is as follows:
The device for synchronously removing nitrogen and phosphorus and realizing capacity comprises a reaction tank, a cooling tank, a water pump and a heat absorption pipe, wherein a magnesium anode and an air cathode are arranged in the reaction tank; the heat absorption pipe is spirally wound outside the reaction tank, one end of the heat absorption pipe is communicated with the bottom of the reaction tank, the other end of the heat absorption pipe is communicated with the cooling tank, the communication point of the heat absorption pipe is lower than the liquid level in the reaction tank, and the air cathode is spirally arranged on the inner surface of the reaction tank and positioned in a region between screw pitches formed by the heat absorption pipe; one electrode of the rotor is connected with the conductive rigid rod, and the other electrode of the rotor is connected with the air cathode; the bottom of the reaction tank is provided with a product discharge port, and the top of the reaction tank is provided with a first water inlet; the inlet of the water pump is connected with the cooling tank, and the outlet of the water pump is connected with the first water inlet.
Preferably, the top of the reaction tank is provided with a magnesium scraping sheet device, the magnesium scraping sheet device is provided with a hole for the magnesium anode and the conductive rigid rod to enter and exit, and the magnesium scraping sheet device is provided with a scraping device which can remove a passivation layer generated by reaction on the surface of the magnesium anode.
Preferably, the magnesium scraping sheet device comprises a cover body, wherein the cover body is connected with the top of the reaction tank, and the hole is formed in the cover body; the scraping device comprises a fixed blade, a movable blade and a spring, wherein the cutting edges of the fixed blade and the movable blade are opposite to each other and are respectively arranged on two sides of a hole, the fixed blade is fixedly connected with a cover body, two ends of the spring are respectively connected with the movable blade and the cover body, the spring is used for applying force for enabling the movable blade to move towards the fixed blade to the movable blade, a push button is connected to the movable blade, a push rail for the push button to move is arranged on the cover body, the moving direction of the push button is parallel to the axis of the spring, and the first water inlet is formed in the cover body.
Preferably, the reaction tank comprises a cylindrical tank body and a truncated cone-shaped product collecting hopper, the large end of the truncated cone-shaped product collecting hopper is connected with the bottom of the cylindrical tank body, the product discharge port is arranged at the small end of the truncated cone-shaped product collecting hopper, the heat absorption pipe is arranged outside the cylindrical tank body, the air cathode is arranged on the inner surface of the cylindrical tank body, the magnesium anode is positioned in the inner cavity of the cylindrical tank body, and one end of the heat absorption pipe is communicated with the bottom of the cylindrical tank body.
Preferably, the inclination angle of the truncated cone-shaped product collecting hopper is 55-60 degrees.
Preferably, the ratio of the volume of the cylindrical cell body to the surface area of the magnesium anode is 1: (0.08-0.11), the surface area ratio of the volume of the cylindrical cell body to the air cathode is 1: (0.9-1.2).
Preferably, the winding height of the heat absorption tube accounts for 83% -86% of the height of the cylindrical tank body, and the winding height of the air cathode accounts for 74% -77% of the height of the cylindrical tank body.
Preferably, the conductive rigid rod is a stainless steel rod, and the stainless steel rod, the central shaft of the magnesium anode and the axis of the reaction tank are coaxial.
The invention also provides a method for synchronously removing nitrogen and phosphorus and realizing productivity, which is carried out by adopting the device for synchronously removing nitrogen and phosphorus and realizing productivity, and comprises the following steps:
Adopting a sequencing batch reaction mechanism, initially reacting, introducing electrolyte containing phosphate ions and ammonium ions into a reaction tank, enabling the liquid level of the electrolyte to be higher than the upper boundary of a magnesium anode, connecting the magnesium anode and an air cathode with an external electric appliance through a wire, and collecting produced struvite precipitate through a product discharge port, wherein the magnesium ions obtained by the electron losing transformation of the magnesium anode and the phosphate ions and the ammonium ions in the electrolyte generate struvite precipitate; the rotor is driven to rotate by electric energy generated by the magnesium anode and the air cathode, and the rotor drives the magnesium anode to rotate through the conductive rigid rod and stirs electrolyte in the reaction tank;
Electrolyte in the reaction tank enters one end of the heat absorption pipe from the bottom of the reaction tank, flows into the cooling tank from the other end of the heat absorption pipe, and is pumped out by the water pump and added into the reaction tank.
Preferably, the molar ratio of nitrogen to phosphorus in the electrolyte is controlled to be 1 (1-1.2), and the pH value is controlled to be 8.5-9.5.
The invention has the following beneficial effects:
The anode of the device for synchronously removing nitrogen and phosphorus and realizing the capacity adopts the magnesium anode, the electrolyte can be prepared from anaerobic digestion wastewater and chemical throwing wastewater, when the reaction is carried out, the magnesium electrode loses electrons to obtain magnesium ions, and the magnesium ions are combined with ammonium ions and phosphate ions in the electrolyte to generate struvite precipitation, so that the slow release fertilizer of struvite is obtained in addition to synchronously realizing the removal of nitrogen and phosphorus, and the economic benefit is brought. The heat absorption pipe is spirally wound on the outer surface of the reaction tank, so that the influence of the reaction temperature rise in the reaction tank on the air cathode property is slowed down; and the combination of the magnesium electrode, the conductive rigid rod and the rotor stirs the electrolyte, so that the winding condition of the conductive rigid rod and a lead is avoided, and the phenomenon that the local concentration in the reaction tank is too high or too low is avoided, so that the whole battery can maintain stable electricity production efficiency. Magnesium is used as one of the most abundant light metal elements on earth, and the magnesium is used as an anode, so that the cost can be greatly reduced; the invention adopts single-chamber power generation, reduces the use of the ion membrane, reduces the economic loss and avoids secondary pollution. The invention not only can synchronously remove nitrogen and phosphorus, realize resource recycling, but also can generate electricity and collect and utilize electric energy, thereby conforming to the ideas of green environmental protection and green economy.
Further, the top of the reaction tank is provided with a magnesium scraping sheet device, the magnesium scraping sheet device can remove magnesium anode surface products, and in the middle of the reaction, when the magnesium anode surface is passivated, a passivation layer on the magnesium anode surface can be timely removed, so that the reduction of denitrification and dephosphorization efficiency can be effectively relieved on the one hand, and the continuous and stable discharge of the battery can be ensured on the other hand.
Drawings
FIG. 1 is a schematic view of the overall structure of an apparatus for simultaneous denitrification and dephosphorization and capacity realization according to the present invention;
FIG. 2 is a top view of the apparatus for removing anode surface products for an apparatus for simultaneous nitrogen and phosphorus removal and capacity according to the present invention;
FIG. 3 is a schematic cross-sectional view of a-a1 of FIG. 1;
FIG. 4 is a schematic cross-sectional view of the vertical plane a-a1 of FIG. 1;
In the figure: the device comprises an A-reaction zone, a B-cooling zone, a 1-product discharge port, a 2-product collecting bucket, a 3-cylindrical tank body, a 4-heat absorption pipe, a 5-magnesium anode, a 6-air cathode, a 7-stainless steel rod, an 8-rotor, a 9-wire, a 10-electric signal collector, a 11-resistor, a 12-magnesium scraping sheet device, a 12-1-screw, a 12-2-first water inlet, a 12-3-1-fixed blade, a 12-3-2-movable blade, a 12-4-hole, a 12-5-spring, a 12-6-upper cover, a 12-7-push rail, a 12-8-lower cover, a 12-9-push button, a 13-water pump, a 14-first pipeline, a 15-second pipeline, a 16-water outlet and a 17-second water inlet.
Detailed Description
The invention will be further described with reference to the following specific drawings and examples. The preferred embodiments may be combined in any desired manner unless specifically stated or conflicting.
As shown in fig. 1-4, the device for synchronously removing nitrogen and phosphorus and realizing productivity comprises a reaction tank, a cooling tank, a water pump 13 and a heat absorption tube 4, wherein a magnesium anode 5 and an air cathode 6 are arranged in the reaction tank, the magnesium anode 5 is arranged in an inner cavity of the reaction tank, a conductive rigid rod is connected to the magnesium anode 5 and penetrates through the top of the reaction tank, and a rotor 8 is connected to the top of the conductive rigid rod; the heat absorption pipe 4 is spirally arranged outside the reaction tank, one end of the heat absorption pipe 4 is communicated with the bottom of the reaction tank, the other end of the heat absorption pipe 4 is communicated with the cooling tank, and the communication point is lower than the liquid level in the reaction tank; the air cathode 6 and the heat absorbing long tube 4 are respectively positioned on the inner surface and the outer surface of the reaction tank in staggered winding, namely, the strip-shaped air cathode 6 is spirally arranged on the inner surface of the reaction tank and positioned in the area between the screw pitches formed by the heat absorbing tube 4; one electrode of the rotor 8 is connected with the conductive rigid rod, and the other electrode of the rotor 8 is connected with the air cathode 6; the bottom of the reaction tank is provided with a product discharge port 1, and the top of the reaction tank is provided with a first water inlet 12-2; an inlet of the water pump 13 is connected with the cooling tank, and an outlet of the water pump 13 is connected with the first water inlet 12-2. In the device, in the process of treating wastewater, the rotor 8 can rotate by utilizing electric energy generated by reaction, the magnesium anode 5 is driven to rotate by the conductive rigid rod, and the stirring of electrolyte in the reaction tank is realized by utilizing the magnesium anode 5. The main principle of cooling the heat absorption pipe 4 is to cool the electrolyte in the reaction tank, the heat dissipation area can be increased by coiling (i.e. spiral), in addition, in order to keep the air cathode 6 as a whole, the air cathode 6 with a large cross area is adopted as much as possible, and the air cathode 6 is arranged to be a novel integral structure, and meanwhile, the contact area with the electrolyte and the cooling requirement of the electrolyte can be considered.
As a preferred embodiment of the invention, a magnesium scraping device 12 is arranged at the top of the reaction tank, a hole 12-4 for the magnesium anode 5 and a conductive rigid rod to enter and exit is arranged on the magnesium scraping device 12, and a scraping device capable of removing a passivation layer generated by the reaction on the surface of the magnesium anode 5 is arranged on the magnesium scraping device 12 at the hole 12-4. In operation, the magnesium anode 5 is periodically withdrawn from the aperture 12-4 and inserted, at which time the passivation layer on the surface of the magnesium anode 5 can be scraped off by the scraping means.
As a preferred embodiment of the present invention, the magnesium scraping plate device 12 comprises a cover body, wherein the cover body is connected with the top of the reaction tank, and the pore 12-4 is arranged on the cover body; the scraping device comprises a fixed blade 12-3-1, a movable blade 12-3-2 and a spring 12-5, wherein the cutting edges of the fixed blade 12-3-1 and the movable blade 12-3-2 are opposite to each other and are respectively arranged on two sides of a hole 12-4, the fixed blade 12-3-1 is fixedly connected with a cover body, two ends of the spring 12-5 are respectively connected with the movable blade 12-3-2 and the cover body, the spring 12-5 is used for applying force for the movable blade 12-3-2 to enable the movable blade 12-3-2 to move towards the fixed blade 12-3-1, a push button 12-9 is connected to the movable blade 12-3-2, a push rail 12-7 for enabling the push button 12-9 to move is arranged on the cover body, the moving direction of the push button 12-9 is parallel to the axis of the spring 12-5, and the first water inlet 12-2 is arranged on the cover body. In the magnesium-scraping blade device 12, the passivation layer on the surface of the magnesium anode 5 can be scraped by the cutting edge of the movable blade 12-3-2 of the fixed blade 12-3-1. The spring 12-5 can keep the blade of the movable blade 12-3-2 in contact all the time when scraping the passivation layer on the surface of the magnesium anode 5, and can adapt to the entering and exiting of the magnesium anode with different thickness from the reaction tank. The push button 12-9 is used for facilitating the opening and closing between the fixed blade 12-3-1 and the movable blade 12-3-2 and facilitating the in and out of the magnesium anode 5.
As a preferred embodiment of the invention, the reaction tank comprises a cylindrical tank body 3 and a truncated cone-shaped product collecting hopper 2, wherein the large end of the truncated cone-shaped product collecting hopper 2 is connected with the bottom of the cylindrical tank body 3, a product discharge port 1 is arranged at the small end of the truncated cone-shaped product collecting hopper 2, a heat absorption pipe 4 is arranged outside the cylindrical tank body 3, an air cathode 6 is arranged on the inner surface of the cylindrical tank body 3, a magnesium anode 5 is positioned in the inner cavity of the cylindrical tank body 3, and one end of the heat absorption pipe 4 is communicated with the bottom of the cylindrical tank body 3. The round table-shaped product collecting hopper 2 is convenient for collecting and recycling the produced struvite. The inclination angle of the truncated cone-shaped product collecting hopper 2 is 55-60 degrees, and under the inclination angle, the produced struvite can be converged at the product discharge port 1 under the action of gravity to prevent accumulation.
As a preferred embodiment of the present invention, the ratio of the volume of the cylindrical cell body 3 to the surface area of the magnesium anode 5 is 1: (0.08-0.11), the ratio of the volume of the cylindrical cell body 3 to the surface area of the air cathode 6 is 1: (0.9-1.2). The winding height of the heat absorbing pipe 4 accounts for 83% -86% of the height of the cylindrical tank body 3, and the winding height of the air cathode 6 accounts for 74% -77% of the cylindrical tank body 3. Under the above parameters, the reaction of the present invention can be ensured to have higher efficiency.
As a preferred embodiment of the present invention, the conductive rigid rod is a stainless steel rod 7, and the stainless steel rod 7, the central axis of the magnesium anode 5, and the axis of the reaction tank are coaxial.
The invention also provides a method for synchronously removing nitrogen and phosphorus and realizing productivity, which is carried out by adopting the device for synchronously removing nitrogen and phosphorus and realizing productivity, and comprises the following steps:
Adopting a sequencing batch reaction mechanism, initially reacting, introducing electrolyte containing phosphate ions and ammonium ions into a reaction tank, enabling the liquid level of the electrolyte to be higher than the upper boundary of a magnesium anode 5, connecting the magnesium anode 5 and an air cathode 6 with an external electric appliance through a lead 9, and collecting the produced struvite precipitate through a product discharge port 1, wherein the magnesium ions obtained by converting the loss of electrons of the magnesium anode 5 and the phosphate ions and the ammonium ions in the electrolyte generate struvite precipitate; the rotor 8 is driven to rotate by the electric energy generated by the magnesium anode 5 and the air cathode 6, and the rotor 8 drives the magnesium anode 5 to rotate through the conductive rigid rod and stirs the electrolyte in the reaction tank;
Electrolyte in the reaction tank enters one end of the heat absorption tube 4 from the bottom of the reaction tank, and flows into the cooling tank from the other end of the heat absorption tube 4, and the water pump 13 pumps out the electrolyte in the cooling tank and adds the electrolyte into the reaction tank.
As a preferred embodiment of the invention, the molar ratio of nitrogen to phosphorus in the electrolyte is controlled to be 1 (1-1.2), and the pH value is controlled to be 8.5-9.5.
According to the scheme, the device and the method for treating the anaerobic digestion wastewater by using the magnesium-air battery and recycling the nitrogen and phosphorus resources in the form of struvite are provided for the anaerobic digestion wastewater, and the device and the method can realize electricity generation while recycling the nitrogen and phosphorus resources, so that the device and the method can achieve two purposes.
Examples
As shown in fig. 1 to 4, the device for synchronously removing nitrogen and phosphorus and realizing productivity in the embodiment comprises a main reaction area a and a cooling area B, wherein the main structure of the reaction area a is a reaction tank, the reaction tank is formed by connecting a cylindrical tank body 3 and a circular truncated cone-shaped product collecting hopper 2, a strip-shaped air cathode 6 is attached to the inner surface of the cylindrical tank body 3, the air cathode 6 is spirally arranged, a heat absorbing pipe 4 is spirally wound on the outer surface of the cylindrical tank body 3, a magnesium anode 5 is suspended in the center of the inner part of the cylindrical tank body 3, a stainless steel rod 7, a rotor 8 and a conducting wire 9 are sequentially connected to the upper end of the magnesium anode 5 from bottom to top, and the air cathode 6 is also connected with the conducting wire 9 and forms a passage with the conducting wire connected with the anode; the main structure of the cooling zone B is a cooling tank, the cooling tank adopts a cylinder without a cover, an inlet of a water pump 13 is connected with the bottom of the cooling tank through a section of first pipeline 14, and an outlet of the water pump 13 is connected with a first water inlet 12-2 at the top of the reaction tank through a section of first pipeline 14. The lower extreme and the bottom intercommunication of cylindrical cell body 3 of heat pipe 4, the top of heat pipe 4 is connected to the top of cooling tank, and the tie point of heat pipe 4 and cooling tank is not higher than the liquid level in the cylindrical cell body 3, can guarantee like this through the action of gravity, makes the electrolyte in the cylindrical cell body 3 flow into in the cooling tank smoothly.
In this embodiment, as shown in fig. 2, a magnesium scraping device 12 is disposed at the top of the cylindrical tank body 3, the magnesium scraping device 12 includes a cover body, the cover body is connected with the top of the cylindrical tank body 3 by bolts, and the hole 12-4 is opened on the cover body; the scraping device comprises a fixed blade 12-3-1, a movable blade 12-3-2 and a spring 12-5, wherein the cutting edges of the fixed blade 12-3-1 and the movable blade 12-3-2 are opposite to each other and are respectively arranged on two sides of a hole 12-4, the fixed blade 12-3-1 is fixedly connected with a cover body, two ends of the spring 12-5 are respectively connected with the movable blade 12-3-2 and the cover body, the spring 12-5 is used for applying force for the movable blade 12-3-2 for enabling the movable blade 12-3-2 to move towards the fixed blade 12-3-1, a push button 12-9 is connected to the movable blade 12-3-2, a push rail 12-7 for enabling the push button 12-9 to move is arranged on the cover body, the moving direction of the push button 12-9 is parallel to the axis of the spring 12-5, the fixed blade 12-3-1 exposes the sharp end into the hole 12-4, the movable blade 12-3-2 is connected with the spring 12-5 and the push button 12-9, and the push button moves in the push rail 12-7. The first water inlet 12-2 is arranged on the cover body. Wherein the cover body adopts a combination form of an upper cover 12-6 and a lower cover 12-8, the upper cover 12-6 and the lower cover 12-8 are fixed at the top of the cylindrical tank body 3 together through bolts, and the fixed blade 12-3-1 and the movable blade 12-3-2 are arranged at the interface between the upper cover 12-6 and the lower cover 12-8. The lower cover 12-8 is connected with the cylindrical tank body 3 by a nested structure.
In this embodiment, the reaction tank, the cooling tank, the product collecting hopper, the cover plate, the pipeline and the like are made of organic glass, and the sizes of the components can be adjusted according to practical situations. In the embodiment, the ratio of the volume of the cylindrical cell body 3 to the surface area of the magnesium sheet is 1cm 3/0.11cm2 and the ratio of the surface area of the air cathode is 1cm 3/1.2cm2. The inverted round table-shaped smooth dead-angle-free product collecting hopper has an inclination angle of 60 degrees and the height of 2/5 of that of the cylindrical tank body 3. The molar ratio of nitrogen to phosphorus of the electrolyte is 1:1. The volume ratio of the cylindrical tank body 3 to the cooling tank is 1:1, and the volume ratio of the cylindrical tank body 3 to the heat absorption pipe 4 is 5:4. The upper duty ratio (the ratio of the upper volume to the volume of the cylindrical tank body) of the cylindrical tank body 3 was 14%. The winding height of the heat absorption tube (the vertical distance between the horizontal lines where the beginning end and the tail end of the heat absorption tube are positioned) accounts for 86% of the height of the cylindrical cell body, and the winding height of the air cathode accounts for 74% of the cylindrical cell body. The air cathode is strip-shaped, is formed by pressing a carbon base, a diffusion layer and a catalytic layer, and is completely immersed in electrolyte. The electrolyte has a suitable pH value of 8.5-9.5, and the formation of struvite can be observed on the surfaces of the product collecting hopper and the magnesium anode. Through experiments, the size proportion and the parameters can better fulfill the aim of the experiment.
In the embodiment, the zero-valent iron-based synchronous denitrification and dephosphorization microbial fuel cell is manufactured by adopting organic glass, and the working process is as follows:
Step 1, the device adopts a sequencing batch reaction mechanism, the reaction is initiated, waste water is introduced into a reaction tank, the liquid level of electrolyte is slightly higher than the upper boundary of a magnesium anode 5, and an air cathode 6 and the magnesium anode 5 are connected with an electric signal collector 10 and an external resistor 11 through a lead 9. The electrons lost by the magnesium anode 5 are converted into magnesium ions, the magnesium ions and phosphate ions and ammonium ions in the wastewater generate struvite precipitates, the struvite precipitates are gathered in the product collecting hopper 2 and discharged from the product discharging port 1, and the electrons lost by the magnesium anode are transferred to the air cathode.
In step 2, the waste water reaches the heat absorbing pipe 4 through the second water inlet 17, and is spirally fed from bottom to top to absorb heat generated by the reaction, and when the heat absorbing pipe 4 is full, the heat absorbing waste water reaches the cooling tank through the second pipeline 15. After cooling, the waste water in the cooling tank is discharged from a water outlet 16 at the bottom end of the side surface, and the waste water is conveyed to the reaction tank through a water pump 13 and a first pipeline 14, so that the step 1 is repeated.
From the scheme, the invention has the following characteristics:
1. the magnesium sheet is low in price and easy to obtain, and the consumption of the ion membrane is reduced by the single-chamber structure, so that the cost of denitrification and dephosphorization of the wastewater is greatly reduced;
2. on the basis of high-efficiency denitrification and dephosphorization, nitrogen and phosphorus resources are recycled in the form of struvite, so that economic benefits are generated;
3. The heat absorber, the anode surface product removing device and the electrolyte stirring device can enable the battery to stably operate.
Claims (8)
1. The device for synchronously removing nitrogen and phosphorus and realizing productivity is characterized by comprising a reaction tank, a cooling tank, a water pump (13) and a heat absorption pipe (4), wherein a magnesium anode (5) and an air cathode (6) are arranged in the reaction tank, the magnesium anode (5) is arranged in an inner cavity of the reaction tank, a conductive rigid rod is connected to the magnesium anode (5), penetrates through the top of the reaction tank, and a rotor (8) is connected to the top of the conductive rigid rod; the heat absorption pipe (4) is spirally arranged outside the reaction tank, one end of the heat absorption pipe (4) is communicated with the bottom of the reaction tank, the other end of the heat absorption pipe (4) is communicated with the cooling tank, the communication point of the heat absorption pipe is lower than the liquid level in the reaction tank, and the air cathode (6) is spirally arranged on the inner surface of the reaction tank and positioned in the area between the screw pitches formed by the heat absorption pipe (4); one electrode of the rotor (8) is connected with the conductive rigid rod, and the other electrode of the rotor (8) is connected with the air cathode (6); the bottom of the reaction tank is provided with a product discharge port (1), and the top of the reaction tank is provided with a first water inlet (12-2); an inlet of the water pump (13) is connected with the cooling tank, and an outlet of the water pump (13) is connected with the first water inlet (12-2);
the reaction tank comprises a cylindrical tank body (3) and a truncated cone-shaped product collecting hopper (2), the large end of the truncated cone-shaped product collecting hopper (2) is connected with the bottom of the cylindrical tank body (3), a product discharge port (1) is formed in the small end of the truncated cone-shaped product collecting hopper (2), a heat absorption pipe (4) is arranged outside the cylindrical tank body (3), an air cathode (6) is arranged on the inner surface of the cylindrical tank body (3), a magnesium anode (5) is positioned in the inner cavity of the cylindrical tank body (3), and one end of the heat absorption pipe (4) is communicated with the bottom of the cylindrical tank body (3);
the conductive rigid rod adopts a stainless steel rod (7), and the central axes of the stainless steel rod (7), the magnesium anode (5) and the axis of the reaction tank are coaxial.
2. The device for synchronously removing nitrogen and phosphorus and realizing capacity according to claim 1, wherein a magnesium scraping plate device (12) is arranged at the top of the reaction tank, a hole (12-4) for a magnesium anode (5) and a conductive rigid rod to enter and exit is arranged on the magnesium scraping plate device (12), and a scraping device capable of removing a passivation layer generated by reaction on the surface of the magnesium anode (5) is arranged on the magnesium scraping plate device (12) at the hole (12-4).
3. The device for synchronously removing nitrogen and phosphorus and realizing capacity according to claim 2, wherein the magnesium scraping device (12) comprises a cover body, the cover body is connected with the top of the reaction tank, and the pore (12-4) is formed on the cover body; the scraping device comprises a fixed blade (12-3-1), a movable blade (12-3-2) and a spring (12-5), the cutting edges of the fixed blade (12-3-1) and the movable blade (12-3-2) are opposite to each other and are respectively arranged on two sides of a hole (12-4), the fixed blade (12-3-1) is fixedly connected with a cover body, two ends of the spring (12-5) are respectively connected with the movable blade (12-3-2) and the cover body, the spring (12-5) is used for applying force for enabling the movable blade (12-3-2) to move towards the fixed blade (12-3-1), a push button (12-9) is connected to the movable blade (12-3-2), a push rail (12-7) for enabling the push button (12-9) to move is arranged on the cover body, the moving direction of the push button (12-9) is parallel to the axis of the spring (12-5), and the first water inlet (12-2) is arranged on the cover body.
4. The device for synchronously removing nitrogen and phosphorus and realizing capacity according to claim 1, wherein the inclination angle of the truncated cone-shaped product collecting hopper (2) is 55-60 degrees.
5. The device for simultaneous nitrogen and phosphorus removal and capacity realization according to claim 1, wherein the surface area ratio of the volume of the cylindrical tank body (3) to the magnesium anode (5) is 1cm 3：（0.08~0.11）cm2, and the surface area ratio of the volume of the cylindrical tank body (3) to the air cathode (6) is 1cm 3：（0.9~1.2）cm2.
6. The device for synchronously removing nitrogen and phosphorus and realizing capacity according to claim 1, wherein the winding height of the heat absorbing pipe (4) is 83% -86% of the height of the cylindrical tank body (3), and the winding height of the air cathode (6) is 74% -77% of the cylindrical tank body (3).
7. A method for synchronously removing nitrogen and phosphorus and realizing productivity, which is characterized in that the method is carried out by adopting the device for synchronously removing nitrogen and phosphorus and realizing productivity according to any one of claims 1-6, and comprises the following steps:
Adopting a sequencing batch reaction mechanism, initially reacting, introducing electrolyte containing phosphate ions and ammonium ions into a reaction tank, enabling the liquid level of the electrolyte to be higher than the upper boundary of a magnesium anode (5), connecting the magnesium anode (5) and an air cathode (6) with external electric appliances through a lead (9), and collecting produced struvite precipitates through a product discharge port (1) by the magnesium ions obtained by losing electron conversion of the magnesium anode (5) and the phosphate ions and the ammonium ions in the electrolyte; the rotor (8) is driven to rotate by electric energy generated by the magnesium anode (5) and the air cathode (6), and the rotor (8) drives the magnesium anode (5) to rotate through the conductive rigid rod and agitates electrolyte in the reaction tank;
electrolyte in the reaction tank enters one end of the heat absorption pipe (4) from the bottom of the reaction tank, flows into the cooling tank from the other end of the heat absorption pipe (4), and is pumped out by the water pump (13) and added into the reaction tank.
8. The method for synchronously removing nitrogen and phosphorus and realizing productivity according to claim 7, wherein the molar ratio of nitrogen to phosphorus in the electrolyte is controlled to be 1 (1-1.2), and the pH is controlled to be 8.5-9.5.
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