CN114751488A - Electrochemical treatment system and application thereof in phosphorus recovery - Google Patents
Electrochemical treatment system and application thereof in phosphorus recovery Download PDFInfo
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- CN114751488A CN114751488A CN202210353909.XA CN202210353909A CN114751488A CN 114751488 A CN114751488 A CN 114751488A CN 202210353909 A CN202210353909 A CN 202210353909A CN 114751488 A CN114751488 A CN 114751488A
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 239000011574 phosphorus Substances 0.000 title claims abstract description 63
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 62
- 238000011084 recovery Methods 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 106
- -1 hydrogen ions Chemical class 0.000 claims abstract description 66
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 36
- 239000001257 hydrogen Substances 0.000 claims abstract description 36
- 239000000945 filler Substances 0.000 claims abstract description 34
- 239000002351 wastewater Substances 0.000 claims abstract description 31
- 238000001556 precipitation Methods 0.000 claims abstract description 23
- 230000004888 barrier function Effects 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000002244 precipitate Substances 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims description 35
- 229910021532 Calcite Inorganic materials 0.000 claims description 28
- 238000012545 processing Methods 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 229910052751 metal Inorganic materials 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 22
- 239000002184 metal Substances 0.000 claims description 19
- 239000003575 carbonaceous material Substances 0.000 claims description 14
- 239000010405 anode material Substances 0.000 claims description 11
- 239000010406 cathode material Substances 0.000 claims description 11
- 150000001768 cations Chemical class 0.000 claims description 10
- 150000001450 anions Chemical class 0.000 claims description 8
- 239000007769 metal material Substances 0.000 claims description 6
- 150000002739 metals Chemical class 0.000 claims description 6
- 239000010459 dolomite Substances 0.000 claims description 5
- 229910000514 dolomite Inorganic materials 0.000 claims description 5
- 239000001095 magnesium carbonate Substances 0.000 claims description 5
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 5
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 5
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 238000012856 packing Methods 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims 1
- 239000000047 product Substances 0.000 abstract description 24
- 230000001965 increasing effect Effects 0.000 abstract description 15
- 239000010865 sewage Substances 0.000 abstract description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 6
- 238000000926 separation method Methods 0.000 abstract description 5
- 230000014759 maintenance of location Effects 0.000 abstract description 4
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 238000011027 product recovery Methods 0.000 abstract description 2
- 239000001506 calcium phosphate Substances 0.000 description 22
- 229910000389 calcium phosphate Inorganic materials 0.000 description 22
- 235000011010 calcium phosphates Nutrition 0.000 description 22
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 22
- 239000007787 solid Substances 0.000 description 12
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 7
- 229910001424 calcium ion Inorganic materials 0.000 description 7
- 239000003792 electrolyte Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000004594 Masterbatch (MB) Substances 0.000 description 5
- 239000008187 granular material Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004626 scanning electron microscopy Methods 0.000 description 4
- 239000013049 sediment Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000029087 digestion Effects 0.000 description 3
- 238000012851 eutrophication Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004611 spectroscopical analysis Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 238000002354 inductively-coupled plasma atomic emission spectroscopy Methods 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 229910052741 iridium Inorganic materials 0.000 description 2
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 229910052701 rubidium Inorganic materials 0.000 description 2
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000007832 Na2SO4 Substances 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- ZQBZAOZWBKABNC-UHFFFAOYSA-N [P].[Ca] Chemical compound [P].[Ca] ZQBZAOZWBKABNC-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 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 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000007743 anodising Methods 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
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000002242 deionisation method Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000003014 ion exchange membrane Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 229910052567 struvite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000002699 waste material 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
- 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
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/32—Phosphates of magnesium, calcium, strontium, or barium
-
- 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
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- 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
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/02—Electrodes; Manufacture thereof not otherwise provided for characterised by shape or form
- C25B11/03—Electrodes; Manufacture thereof not otherwise provided for characterised by shape or form perforated or foraminous
- C25B11/031—Porous electrodes
-
- 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
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
- C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
- C25B11/055—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the substrate or carrier material
- C25B11/057—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the substrate or carrier material consisting of a single element or compound
- C25B11/061—Metal or alloy
- C25B11/063—Valve metal, e.g. titanium
-
- 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
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
- C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
- C25B11/073—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material
- C25B11/091—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic 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
- 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
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention belongs to the technical field of sewage treatment, and discloses an electrochemical treatment system and application thereof in phosphorus recovery. According to the electrochemical treatment system, because the filling material filled in the anode reacts with the hydrogen ions generated by the anode, the loss of hydroxyl is effectively avoided, a local high-pH environment is formed on the surface of the cathode, the saturation index of the first precipitate is increased, the recovery efficiency of the first precipitate is improved, and the required hydraulic retention time is shortened; simultaneously, the first deposit separation that the barrier piece produced the negative pole can be kept apart first deposit and filler material effectively in the region outside filler material, has avoided first deposit to adhere to the filler material surface, is favorable to the recovery of first deposit to be recycled. The method is applied to the recovery of phosphorus in phosphorus-containing wastewater, and can limit the generation of electrochemical induced precipitation in the region outside the anode filling material, thereby realizing the separation of high-purity products and the filling material and solving the problems of low product recovery rate and difficult recovery.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an electrochemical treatment system and application thereof in phosphorus recovery.
Background
The worldwide contradiction that the phosphorite resources are increasingly deficient but the phosphorus content in the environmental water body is overhigh to cause the eutrophication of the water body generally exists. The phosphorus in the sewage is removed and recovered, and the sustainable utilization of the phosphorus and the prevention and control of water eutrophication can be integrated.
In recent years, electrochemical treatment technology has attracted considerable attention as a new technology in the fields of water treatment and resource recovery. Through verification, the high-efficiency recovery of phosphorus resources from various sewage can be realized through electrochemical induced precipitation, capacitive deionization, electrodialysis and other technologies. Among them, the electrochemical induced calcium phosphate precipitation technology has been receiving wide attention and rapidly developed depending on its various advantages. In addition to the additional cost and pollution caused by the transportation and use of the medicament, a large amount of chemical sludge generated in the sedimentation process is difficult to treat. In contrast, the electrochemical induced precipitation effectively avoids transportation cost and secondary pollution by utilizing the in-situ alkali production characteristic, and the generated solid product is closely attached to the electrode in the form of phosphate solid, thereby greatly facilitating subsequent recycling. In addition, because calcium ions are widely present in various types of wastewater, the selection of calcium phosphate as the target product can effectively avoid, for example, the limitation of magnesium source in the struvite recovery process.
In the electrochemical induced calcium phosphate deposition technology, water molecules are reduced on the surface of a cathode, and generated hydroxyl can form a local high-pH environment on the surface of the cathode to increase the saturation index of calcium phosphate in the local area, so that the calcium phosphate is induced to be deposited on the surface of an electrode in a heterogeneous mode. Of course, the electrochemically induced calcium phosphate deposition technique is not perfect, and the difficulties remain. Based on the principle of this technology, it is a key to efficiently utilize the hydroxyl generated by the cathode. In the current membrane-free integrated system, part of hydroxide radicals can be combined with hydrogen ions generated by an anode to regenerate water molecules, so that partial loss of the hydroxide radicals is caused. Although this difficulty can be addressed by the introduction of ion exchange membranes, the introduction of redundant plant components and the attendant maintenance costs are undoubtedly a barrier to their large-scale practical use.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
To solve the problems of the background art, a first object of the present invention is to provide an electrochemical processing system capable of isolating the precipitation of a cathode from the filling material of an anode.
A second object of the present invention is to provide a method for recovering phosphorus using an electrochemical treatment system, which can precipitate phosphorus out of an anode filler and improve the recovery rate of phosphorus.
In order to achieve the above purpose, the first technical solution adopted by the present invention is:
an electrochemical processing system, comprising: a reaction tank;
an anode disposed in the reaction tank, the anode being filled with a filler material in the vicinity of the anode;
a cathode disposed in the reaction tank, the cathode generating a first precipitate;
a barrier that blocks the first precipitate from a region other than the filler material; and
and the anode of the power supply is electrically connected with the anode, and the cathode of the power supply is electrically connected with the cathode.
Preferably, the anode material is a material capable of enabling the anode to oxidize water molecules to generate hydrogen ions;
more preferably, the anode material includes, but is not limited to, inert metals and carbon materials;
preferably, the cathode material is a material capable of enabling the cathode to reduce water molecules to generate hydroxide ions;
more preferably, the cathode material includes, but is not limited to, metal and carbon materials.
Preferably, the filling material is a substance capable of reacting with hydrogen ions and releasing metal cations and anions;
preferably, the filler material includes, but is not limited to, calcite, dolomite, magnesite, polyethylene calcium carbonate master batches, and artificial pressed analytical pure particles.
Preferably, the barrier is the anode.
Preferably, the anode is cylindrical and is used for filling the filling material, the side surface and one end surface of the cylinder are both made of mesh materials, and the other end surface of the cylinder is open and provided with a first conducting rod; the cathode is cylindrical and concentrically arranged outside the anode, the side surface of the cylinder is made of a net material, two end surfaces of the cylinder are both open, and a second conducting rod is arranged on one end surface of the cylinder.
Preferably, the anode is in a plane net shape, a space for filling the filling material is formed by the anode and the wall of the reaction tank, and a third conducting rod is arranged on the anode; the cathode structure is the same as the anode and is arranged at the opposite side of the anode, and the cathode is provided with a third conducting rod.
The second technical scheme adopted by the invention is as follows:
a method for recovering phosphorus using an electrochemical processing system, comprising: providing a reaction tank;
providing an anode positioned in the reaction tank, and filling a filling material near the anode;
providing a cathode positioned in the reaction tank;
the phosphorus-containing wastewater is added into the reaction tank, and the phosphorus precipitation is limited in the space outside the anode filling material.
Preferably, the filling material is a substance capable of reacting with hydrogen ions and releasing metal cations and anions;
More preferably, the filler material comprises, but is not limited to, calcite particles.
Preferably, the anode material is a material capable of enabling the anode to oxidize water molecules to generate hydrogen ions;
more preferably, the anode material includes, but is not limited to, inert metals and carbon materials;
preferably, the cathode material is a material capable of enabling the cathode to reduce water molecules to generate hydroxide ions;
more preferably, the cathode material includes, but is not limited to, metal and carbon materials.
Preferably, a barrier is used to confine the phosphorus deposits to the space outside the anode fill material.
Preferably, the barrier is the anode.
Preferably, the anode is cylindrical and is used for filling the filling material, the side surface and one end surface of the cylinder are both made of mesh materials, and the other end surface of the cylinder is open and provided with a first conducting rod; the cathode is cylindrical and concentrically arranged outside the anode, the side surface of the cylinder is made of a net material, two end surfaces of the cylinder are both open, and one end surface of the cylinder is provided with a second conducting rod.
Preferably, the anode is in a plane net shape, a space for filling the filling material is formed by the anode and the wall of the reaction tank, and a third conducting rod is arranged on the anode;
the cathode structure is the same as the anode and is arranged at the opposite side of the anode, and the cathode is provided with a third conducting rod.
Preferably, the phosphorus-containing wastewater comprises but is not limited to municipal sewage, anaerobic digestion liquid and industrial wastewater.
Compared with the prior art, the invention has the following beneficial effects:
in the electrochemical treatment system, the filling material filled in the anode reacts with the hydrogen ions generated by the anode, so that the loss of hydroxyl is effectively avoided, a local high pH environment is formed on the surface of the cathode, the saturation index of the first precipitate is increased, the recovery efficiency of the first precipitate is improved, and the required hydraulic retention time is shortened; simultaneously, the first deposit separation that the barrier piece produced the negative pole can be kept apart first deposit and filler material effectively in the region outside filler material, has avoided first deposit to adhere to the filler material surface, is favorable to the recovery of first deposit to be recycled.
The electrochemical treatment system is applied to the recovery of phosphorus in phosphorus-containing wastewater, and can limit the generation of electrochemical induced precipitation in the region outside the anode filling material, thereby realizing the separation of high-purity products and the filling material and solving the problems of low product recovery rate and difficult recovery.
Drawings
FIG. 1 is a three-dimensional plan view of a pocketed mesh anode in an electrochemical processing system according to example 1;
FIG. 2 is a front view and a top view of a mesh-type anode in the electrochemical processing system according to example 1;
FIG. 3 is a front elevational view, top plan view of a cathode in the electrochemical processing system of example 1;
FIG. 4 is a pictorial view of an electrochemical processing system according to example 1;
FIG. 5 is a schematic plan view of an anode in the electrochemical processing system according to example 2;
FIG. 6 is a schematic perspective view of an anode in the electrochemical processing system according to example 2;
FIG. 7 is a graph showing changes in pH of experimental group 3 in Experimental example 1;
FIG. 8 is a graph showing the release of calcium ions in experimental group 3 of Experimental example 1;
FIG. 9 is a graph showing changes in pH values of experimental groups 1 and 2 in Experimental example 1;
FIG. 10 shows the phosphorus removal efficiency in experimental groups 1 and 2 of Experimental example 1;
fig. 11 shows the results of scanning electron microscopy and X-ray energy spectroscopy analysis of the surface product of calcite particles of experimental group 1 of experimental example 2 after multiple uses;
FIG. 12 is the results of the scanning electron microscope and X-ray energy spectrum analysis of the surface product after the cathode of experimental group 1 in Experimental example 2 was used;
FIG. 13 is a graph showing the change in the phosphorus removal rate during the 8-hour treatment of phosphorus solutions having different concentrations in Experimental example 3;
FIG. 14 is a graph of the removal rate of phosphorus from phosphorus solutions of different concentrations in example 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In a first embodiment of the present invention, there is provided an electrochemical processing system comprising: a reaction tank; an anode disposed in the reaction tank, the vicinity of the anode being filled with a filler; a cathode disposed in the reaction tank, the cathode generating a first precipitate; a barrier that blocks the first precipitate from a region other than the filler material; and the anode of the power supply is electrically connected with the anode, and the cathode of the power supply is electrically connected with the cathode.
In the electrochemical treatment system according to the first embodiment of the present invention, the filling material filled in the anode reacts with the hydrogen ions generated by the anode, so that the loss of hydroxyl is effectively avoided, a local high pH environment is formed on the surface of the cathode, the saturation index of the first precipitate is increased, the recovery efficiency of the first precipitate is improved, and the required hydraulic retention time is shortened; simultaneously, the barrier piece separates the first sediment that the negative pole produced in the region outside filler material, can keep apart first sediment and filler material effectively, has avoided first sediment to adhere to the filler material surface, is favorable to the recovery of first sediment to recycle.
The anode material is a material which can enable water molecules to be oxidized by the anode to generate hydrogen ions; for example, inert metals and carbon materials, even modified materials, etc. commonly used in the art, which can meet the requirement of anodizing water molecules to generate hydrogen ions, are within the scope of the present invention.
The cathode material is a material which can enable the cathode to reduce water molecules to generate hydroxide ions; for example, the metal and carbon materials, even modified materials, etc. which are commonly used in the art can meet the requirement of the cathode for reducing water molecules to generate hydroxide ions, and all the requirements are within the protection scope of the present invention.
The filling material can be any natural material (such as calcite, dolomite, magnesite and the like) and artificial product (such as polyethylene calcium carbonate master batch, artificial pressed analytical pure particles and the like) which can react with hydrogen ions and release corresponding metal cations and anions; in some preferred embodiments, the filler material is calcite particles.
In the electrochemical processing system according to the first embodiment of the present invention, when the circuit is closed, the oxidation reaction of water molecules occurs on the surface of the anode, and hydrogen ions and oxygen gas are generated (see formula 1). Wherein a part of the hydrogen ions generated is neutralized by the packing material, which is acid-hydrolyzed and releases corresponding cations and anions. For example, when calcite particles are selected as the filler material, a portion of the generated hydrogen ions are neutralized by the calcite particles (see equation 2), so that the depletion of hydroxide ions is mitigated, the concentration of hydroxide ions in the region outside the anode is increased, the saturation index of the precipitation product is increased, and the efficiency of electrochemically induced precipitation is increased. Also, since the acidolysis of calcite particles by hydrogen ions results in the release of calcium ions, another advantage of using calcite as a filler material is the provision of the metal cations necessary for precipitation, increasing the saturation index of the precipitated product calcium phosphate from another perspective, and thus increasing efficiency.
Anode region:
cathode area and wastewater:
when the circuit is closed, water molecules are reduced on the surface of the cathode to generate hydroxide ions and hydrogen (see formula 3). In the conventional electrochemically-induced calcium phosphate precipitation system (i.e., without using a filler), a part of the generated hydroxide ions is consumed by hydrogen ions from the anode (see formula 4), so that the utilization rate of the hydroxide ions is reduced, and finally the calcium phosphate precipitation efficiency is reduced. In the embodiment of the invention, the filling material and the barrier member can effectively inhibit the hydrogen ions and the hydroxyl ions from re-reacting (see formula 4), thereby improving the utilization rate of the hydroxyl ions.
More importantly, due to the introduction of the packing material and the barrier, two distinct regions, a lower pH anode region and a higher pH cathode and wastewater region, are present in the electrochemical system of embodiments of the present invention. Therefore, the first precipitate is induced to precipitate to form a compact solid at a region outside the packing material, that is, on the cathode and is attached thereto, and high-purity recovery of the first precipitate is achieved.
It should be noted that the structure of the separator may be various, and any structure capable of limiting the electrochemically induced precipitation of the cathode to the region outside the anode filler material should fall within the protection scope of the present invention.
In some preferred embodiments, the barrier is the anode; specifically, the anode is cylindrical and is used for filling the filling material, the side surface and one end surface of the cylinder are both made of net-shaped materials, and the other end surface is provided with an opening and a first conducting rod; the maximum pore size of the reticular structure is smaller than the minimum size of the filling material so as to ensure the filling effect; meanwhile, the cathode is cylindrical and concentrically arranged outside the anode, the side surface of the cylinder is made of a net-shaped material, two end surfaces of the cylinder are both open, and one end surface of the cylinder is provided with a second conducting rod.
In the above preferred embodiment, the cylindrical anode is placed in the space formed by the cathode, and is relatively independent in the inner and outer concentric circles, and both are fixed in the reaction tank with proper size, and the required direct current is supplied to the system through the first and second conductive rods by the external direct current power supply, and forms a closed loop together with the electrolyte.
In other preferred embodiments, the barrier is the anode; specifically, the anode is in a plane net shape, is provided with a third conducting rod, is fixed in a reaction tank with a proper size, and forms an independent subspace with the wall shape of the reaction tank, and the subspace is used for filling the filling material; the maximum pore size of the reticular structure is smaller than the minimum size of the filling material so as to ensure the filling effect; meanwhile, the cathode is in the same structure as the anode, and a fourth conducting rod is arranged on the cathode and is arranged on the opposite side of the anode.
In the above preferred embodiment, the planar mesh anode and the wall of the reaction tank form a subspace, which is located in the mother space of the reaction tank, the planar mesh cathode is disposed at the opposite side, and the required dc current is supplied to the system by the external dc power supply through the third conducting rod and the fourth conducting rod, and forms a closed loop together with the electrolyte.
In a second embodiment of the present invention, there is provided a method for recovering phosphorus using an electrochemical processing system, which is a specific application of the electrochemical processing system of the first embodiment, and specifically comprises: providing a reaction tank; providing an anode positioned in the reaction tank, and filling a filling material near the anode; providing a cathode positioned in the reaction tank; the phosphorus-containing wastewater is added into the reaction tank, and the phosphorus precipitation is limited in the space outside the anode filling material.
In a second embodiment of the present invention, the electrochemical treatment system of the first embodiment is used to recover phosphorus from phosphorus-containing wastewater. The characteristics of the relevant anode, cathode, and filler material are the same as those of the first embodiment. Under the condition that the circuit of the electrochemical treatment system is closed, the surface of the anode can generate oxidation reaction of water molecules to generate hydrogen ions and oxygen; a portion of the generated hydrogen ions will be neutralized by the filler material, such that hydroxide ion depletion is mitigated, and the concentration of hydroxide ions in the region outside the anode is increased, thereby increasing the saturation index of the precipitated product calcium phosphate, and ultimately increasing the efficiency of electrochemically-induced calcium phosphate precipitation. Meanwhile, calcium ions are released due to the acidolysis of calcium carbonate solids by hydrogen ions. Thus, another advantage of using calcite particles as a filler material is to provide the metal cations necessary for precipitation, and from another perspective to increase the saturation index of the precipitated product calcium phosphate, and thus the efficiency. In the second embodiment of the invention, the electrochemically induced precipitation is limited to the region outside the anode filling material, so that the re-reaction of the hydrogen ions and the hydroxyl ions is effectively inhibited, the utilization rate of the hydroxyl ions is improved, and the separation of high-purity products from the filling material is realized.
The electrochemical treatment system can treat phosphorus-containing sewage with various concentrations, and the principle of the system lies in that a filling material filled in the anode reacts with hydrogen ions generated by the anode, so that the loss of hydroxyl is effectively avoided, a local high pH environment is formed on the surface of the cathode, the saturation index of the first precipitate is increased, the recovery efficiency of the first precipitate is improved, the required hydraulic retention time is shortened, the less the filling material is, and the less the optimization effect is. In the recycling treatment process, the phosphorus content of the target wastewater is reduced to a certain degree, and the removal degree of the phosphorus depends on the system operation condition, so that the removal of the eutrophic components in the wastewater is realized, and the purpose of preventing and treating the eutrophication of the water body is achieved.
In some embodiments, a barrier is used to confine the phosphorus precipitation to the space outside the anode fill material, and the structure and material of the barrier are the same as in the first embodiment.
The phosphorus-containing wastewater can be municipal sewage, anaerobic digestion solution, industrial wastewater and other phosphorus-containing wastewater; phosphorus-rich sludge and other phosphorus-containing wastes that can participate in the formation of a complete electrochemical system should also fall within the scope of the present invention.
In order to better understand the technical scheme provided by the invention, the electrochemical treatment system, the phosphorus recovery method and the performance test provided by the above embodiment of the invention are respectively explained in the following by using a plurality of specific examples.
Some of the raw material information used in the following specific examples of the present invention is as follows:
the polyethylene calcium carbonate master batch is purchased from Kei Hao plastics Co., Ltd, Dongguan city;
calcite granules were purchased from north Hebei Yanxi mineral processing factories.
The method for measuring the pH value in the following specific embodiments of the invention comprises the following steps: wastewater liquid samples were measured directly by SevenExcellence, METTLER TOLEDO.
In the treatment process, the detection method for the content change condition of calcium and phosphorus elements in the wastewater comprises the following steps: and (3) filtering and diluting the wastewater liquid sample to a proper concentration range, and measuring the specific content of calcium and phosphorus elements by using an inductively coupled plasma emission spectrometer (ICP-OES).
After the treatment was completed, the solid sample was collected manually, the micro-topography was provided by Scanning Electron Microscopy (SEM), and the solid sample components were provided by scanning electron microscopy and energy spectroscopy (SEM-EDS) and digestion in combination with ICP-OES.
Example 1 provides an electrochemical processing system
As shown in fig. 1 and 2, in the electrochemical treatment system of this embodiment, the anode is a net-bag-shaped cylinder, the bottom of the cylinder is sealed by the same net-shaped material, the top of the cylinder is connected with a solid rod of the same material for conducting electricity, and an opening is left for the filling material to enter, so that the cylinder is shaped like a net bag.
As shown in figure 3, the cathode is made of reticular stainless steel, the bottom of the cathode is not sealed, and the top of the cathode is also connected with a solid rod made of the same material for conducting electricity. The cathode material can be metal and carbon materials common in the field, even modified materials and the like, and can meet the requirement that the cathode reduces water molecules to generate hydroxide ions.
The anode material is metal titanium with rubidium and iridium loaded on the surface, and can be inert metal, carbon material, even modified material and the like which are common in the field, and can meet the requirement of oxidizing water molecules by the anode to generate hydrogen ions.
The filler material can be any natural or artificial product capable of reacting with hydrogen ions and releasing corresponding metal cations and anions, such as calcite particles, dolomite and magnesite, polyethylene calcium carbonate master batches and the like.
The electrochemical system consists of the anode and its stuffing, cathode, reaction tank and electrolyte, and the solid calcium phosphate product is adhered closely to the cathode.
As shown in fig. 4, in the electrochemical system, the anode in the form of a mesh bag is placed in the space formed by the cathode, and they are relatively independent in the form of concentric circles inside and outside, and they are fixed together in an electrolytic cell of suitable size. The required direct current is supplied to the system through the cathode and anode conducting rod by an external direct current power supply and forms a closed loop together with the electrolyte.
Example 2 provides an electrochemical processing system
As shown in fig. 5-6, in the electrochemical treatment system of this embodiment, the anode is a sheet electrode with meshes, a solid rod of the same material is connected to the top of the anode as a conductive rod, and the anode and the wall of the reaction tank form an independent space for accommodating the filling material.
The cathode is sheet stainless steel with meshes and the same structure, is arranged on the opposite side of the sheet anode, and is connected with a solid rod made of the same material as a conducting rod.
The anode material is metal titanium with rubidium and iridium loaded on the surface, and can be inert metal, carbon material, even modified material and the like which are common in the field, and can meet the requirement of oxidizing water molecules by the anode to generate hydrogen ions.
The filler material may be any natural or artificial product capable of reacting with hydrogen ions and releasing the corresponding metal cations and anions, such as calcite granules, dolomite and magnesite, polyethylene calcium carbonate masterbatch, etc.
The cathode material can be metal and carbon materials common in the field, even modified materials and the like, and can meet the requirement that the cathode reduces water molecules to generate hydroxide ions.
The electrochemical system consists of the anode and its stuffing, cathode, reaction tank and electrolyte, and the solid calcium phosphate product is adhered closely to the cathode.
In this electrochemical system, a sheet-like anode with mesh is placed on the opposite side of the cathode, both of which are jointly fixed in an electrolytic cell of suitable dimensions. The required direct current is supplied to the system through the cathode and anode conducting rod by an external direct current power supply and forms a closed loop together with the electrolyte.
Example 3 provides a method for recovering phosphorus using an electrochemical processing system
Using the electrochemical treatment system of example 1, 80 g of calcite granules were packed into a mesh anode and co-anchored with a cathodeIn the electrolytic cell, 10mM Na was selected2SO41mM P solution as a model wastewater was treated for 8 hours under the condition that an external power source (applied current value of 20 mA) was supplied.
Example 4
Using the electrochemical treatment system of example 2, 80 g of calcium polyethylene carbonate master batch was filled into the anode of the mesh bag, and fixed together with the cathode in the electrolytic cell, 10mM Na was selected2SO4And various concentrations of solutions P (1 mM, 2mM, 3 mM) as simulated wastewater were treated for 8 hours under the condition that an external power source (applied current value of 40 mA) was supplied.
Experimental example 1 testing pH variation and calcium ion release during treatment under different conditions
The following experimental groups were set up:
experimental group 1: example 3
Experimental group 2: compared with the electrochemical treatment system in the embodiment 3, the electrochemical treatment system is not provided with the filling material, and the rest of the structure is the same as the embodiment 3. Fixing the anode and cathode of the net bag without filler in the electrolytic cell, selecting 10mM Na2SO4And 1mM P solution is used as simulated wastewater, and CaCl is added into calcium ions at the moment2The dosage is 30 mg/L. The treatment was carried out for 8 hours under the condition that an external power source (applied current value of 20 mA) was supplied.
Experimental group 3: using the electrochemical treatment system of example 1, 80 g calcite granules were packed into a mesh anode and co-immobilized with a cathode in an electrolytic cell, 10mM Na was selected2SO40mM P solution as a model wastewater, and treated for 8 hours under the condition of supplying an external power source (applied current value of 20 mA).
From the results of experimental group 3, it was found that a part of the hydrogen ions were neutralized by the calcite particles, so that the depletion of the hydroxide ions was relieved and the hydroxide ion concentration in the region other than the anode was increased (fig. 7). At the same time, calcite granules were acidolyzed by hydrogen ions, with a consequent increase in the calcium ion concentration in the simulated wastewater (fig. 8).
Comparing the results of experimental group 1 and experimental group 2, it can be seen that the presence of calcite particles effectively neutralized the hydrogen ions generated at the anode, so that the accumulation of hydroxide ions in the simulated wastewater of experimental group 1 exceeded the accumulation of hydrogen ions, showing a gradual rise in pH in the simulated wastewater (fig. 9). In contrast, in experimental group 2, since there was no neutralization of the calcite particles, the accumulation of hydrogen ions exceeded the accumulation of hydroxide ions (part of the hydroxide ions were used for the precipitation reaction of calcium phosphate), and the pH in the simulated wastewater showed a downward trend (fig. 9). Therefore, the consumption of hydroxide ions is relieved by filling calcite particles, the concentration of hydroxide ions in the region outside the anode is increased, the saturation index of the calcium phosphate precipitation product is increased, and finally, the efficiency of electrochemically inducing calcium phosphate precipitation is improved, which meets the comparison result of phosphorus removal efficiency of experiment group 1 and experiment group 2 (fig. 10).
Through the results of the experimental group 1 and the experimental group 3, the two distinct regions, namely the anode region with lower pH value and the cathode region with higher pH value and the wastewater region, appear in the electrochemical system due to the introduction of the string bag anode and the calcite particles therein. The calcium phosphate is thus induced to precipitate in the region outside the calcite particles, i.e. on the cathode, to form a compact high-purity calcium phosphate solid.
Experimental example 2 for explaining the phosphorus recovery
Calcite particles (used for multiple times) filled in experimental group 1 of experimental example 1 and cathode surface-generated products were collected for scanning electron microscopy and X-ray energy spectroscopy. The results are shown in FIGS. 11 and 12.
By elemental characterization of the surface portion of calcite particles (after many cycles) (fig. 11), it can be seen that the phosphorus content on the surface of the calcite particles is only 0.58%, demonstrating that calcium phosphate precipitates are hardly precipitated on the surface of the calcite particles. As shown by the elemental characterization of the product formed on the electrode surface (fig. 12), the product was in the form of a cluster and had a calcium-phosphorus ratio close to 1.7, and it was estimated that the product was a high-purity calcium phosphate crystal. Therefore, the product is not mixed with the filling material and is attached to the cathode in the form of high-purity calcium phosphate to be collected, and the problem that the product is difficult to recover due to the fact that the filling material is mixed with the product in the traditional electrochemical packed column process is solved.
Experimental example 3 for explaining the effect of treating wastewater of different concentrations
Using the electrochemical treatment system of example 1, 80 g of calcium polyvinylacetate master batch was filled in a mesh bag anode, fixed in an electrolytic cell together with a cathode, and phosphorus solutions (1 mM, 2mM, 3 mM) of various concentrations were selected as simulated wastewater to be treated for 8 hours under the condition of supplying an external power source (applied current value of 40 mA). As is clear from the results of the experiment (FIG. 13), the phosphorus removal rate (phosphorus) was maintained for 8 hours in the case of treating the wastewater having a phosphorus concentration of 3mMRemoving ofPhosphorusInitial100%) was 12.9%, and the removal ratio was 25.5% and 54.4% when treating wastewater with lower phosphorus concentration (2 mM, 1 mM), respectively. As can be seen from the results (FIG. 14), the phosphorus removal rate (mg phosphorus/day) did not change significantly when the phosphorus concentration in the wastewater was reduced from 3mM to 1 mM. Therefore, the electrochemical system has stable rate when treating phosphorus with various concentrations, and simultaneously solves the problem of low rate of the traditional electrochemical phosphoric acid induction process aiming at sewage with low phosphorus concentration.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An electrochemical processing system, comprising: a reaction tank;
an anode disposed in the reaction tank, the anode being filled with a filler material in the vicinity of the anode;
a cathode disposed in the reaction tank, the cathode generating a first precipitate;
a barrier that blocks the first precipitate from a region other than the filler material; and
and the anode of the power supply is electrically connected with the anode, and the cathode of the power supply is electrically connected with the cathode.
2. The electrochemical processing system of claim 1, wherein the anode material is a material capable of causing anodic oxidation of water molecules to produce hydrogen ions;
preferably, the anode material includes, but is not limited to, inert metals and carbon materials;
preferably, the cathode material is a material capable of enabling the cathode to reduce water molecules to generate hydroxide ions;
more preferably, the cathode material includes, but is not limited to, metal and carbon materials.
3. The electrochemical processing system of claim 1, wherein the filler material is a substance capable of reacting with hydrogen ions and releasing metal cations and anions;
preferably, the filler material includes, but is not limited to, calcite, dolomite, magnesite, polyethylene calcium carbonate master batches, and artificial pressed analytical pure particles.
4. The electrochemical processing system of any one of claims 1 to 3, wherein the barrier is the anode.
5. The electrochemical processing system of claim 4, wherein said anode is cylindrical and filled with said filler material, and wherein the cylindrical side and one end are both mesh material, and the other end is open and provided with a first conductive rod; the cathode is cylindrical and concentrically arranged outside the anode, the side surface of the cylinder is made of a net material, two end surfaces of the cylinder are both open, and one end surface of the cylinder is provided with a second conducting rod;
or alternatively
The anode is in a plane net shape, and forms a space for filling the filling material with the wall of the reaction tank, and a third conducting rod is arranged on the anode; the cathode structure is the same as the anode and is arranged at the opposite side of the anode, and the cathode is provided with a third conducting rod.
6. A method for recovering phosphorus using an electrochemical processing system, comprising: providing a reaction tank;
providing an anode positioned in the reaction tank, and filling a filling material near the anode;
providing a cathode positioned in the reaction tank;
the phosphorus-containing wastewater is added into the reaction tank, and the phosphorus precipitation is limited in the space outside the anode filling material.
7. The method for phosphorus recovery using an electrochemical processing system of claim 6, wherein the packing material is a substance capable of reacting with hydrogen ions and releasing metal cations and anions;
Preferably, the filler material comprises, but is not limited to, calcite particles.
8. The method of recovering phosphorus using an electrochemical processing system as recited in claim 6, wherein the anode material is a material capable of oxidizing water molecules by the anode to generate hydrogen ions;
preferably, the anode material includes, but is not limited to, inert metals and carbon materials;
preferably, the cathode material is a material which can enable the cathode to reduce water molecules to generate hydroxide ions;
more preferably, the cathode material includes, but is not limited to, metals and carbon materials.
9. The method for recovering phosphorus using an electrochemical processing system as recited in any one of claims 6-8, wherein a barrier is used to confine phosphorus precipitation to a space outside the anode fill material;
preferably, the barrier is the anode.
10. The method of claim 9, wherein the anode is cylindrical and filled with the filler material, and has a cylindrical side surface and an end surface both made of mesh material, and the other end surface being open and provided with a first conductive rod; the cathode is cylindrical and concentrically arranged outside the anode, the side surface of the cylinder is made of a net material, two end surfaces of the cylinder are both open, and one end surface of the cylinder is provided with a second conducting rod;
Or alternatively
The anode is in a plane net shape, forms a space for filling the filling material with the wall of the reaction tank, and is provided with a third conducting rod; the cathode structure is the same as the anode and is arranged at the opposite side of the anode, and the cathode is provided with a third conducting rod.
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| EP3202933A1 (en) * | 2014-09-30 | 2017-08-09 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Aluminum alloy brazing sheet |
| CN108675403A (en) * | 2018-04-24 | 2018-10-19 | 同济大学 | A kind of method of electrochemistry struvite crystallization recycling sewerage nitrogen and phosphor |
| CN111206540A (en) * | 2020-02-28 | 2020-05-29 | 苏州金螳螂园林绿化景观有限公司 | Water body purification ecological filter dam |
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| EP3202933A1 (en) * | 2014-09-30 | 2017-08-09 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Aluminum alloy brazing sheet |
| CN108675403A (en) * | 2018-04-24 | 2018-10-19 | 同济大学 | A kind of method of electrochemistry struvite crystallization recycling sewerage nitrogen and phosphor |
| CN111206540A (en) * | 2020-02-28 | 2020-05-29 | 苏州金螳螂园林绿化景观有限公司 | Water body purification ecological filter dam |
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