CN113979532A - Primary cell type constructed wetland system with phosphorus recovery function - Google Patents
Primary cell type constructed wetland system with phosphorus recovery function Download PDFInfo
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- CN113979532A CN113979532A CN202111265655.8A CN202111265655A CN113979532A CN 113979532 A CN113979532 A CN 113979532A CN 202111265655 A CN202111265655 A CN 202111265655A CN 113979532 A CN113979532 A CN 113979532A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/005—Combined electrochemical biological processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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Abstract
The invention discloses a primary cell type constructed wetland system with a phosphorus recovery function, which belongs to the field of sewage resource utilization, and adopts the technical scheme that: the subsurface flow constructed wetland system comprises a substrate layer, wherein at least one primary cell system is arranged in the substrate layer, the primary cell system takes a magnesium electrode as a negative electrode and an inert electrode as a positive electrode, and the magnesium electrode is connected with the inert electrode through a lead; the inert electrode is inserted into the substrate layer, the magnesium electrode is inserted into a phosphorus recovery device in the substrate layer, and phosphorus is enriched on the magnesium electrode through oxidation reaction. The magnesium cathode primary battery system is coupled in the constructed wetland system, the magnesium cathode is arranged in the phosphorus recovery device, and phosphorus is enriched near the magnesium cathode through the oxidation reaction of the magnesium cathode, so that the high-efficiency recovery of the phosphorus is realized.
Description
Technical Field
The invention relates to the field of sewage resource utilization, in particular to a primary cell type constructed wetland system with a phosphorus recovery function.
Background
The phosphorus resource is recovered in the water treatment process, so that the resource recovery and utilization are realized, and the problem of the lack of the phosphorus ore resource can be effectively solved.
The artificial wetland realizes effective purification of sewage by utilizing the comprehensive ecological action of plants, substrates and microorganisms, has the advantages of low capital investment, low operating cost, beautiful ecological landscape and the like, and has outstanding application advantages in the fields of drainage basin water pollution treatment, reclaimed water recycling, ecological restoration and the like in developing areas. Different from the carbon and nitrogen pollutants which can be finally converted into gaseous substances under the action of microorganisms and leave the wetland system, the constructed wetland mainly retains and accumulates the phosphorus in the water body in the system through the adsorption and precipitation of the substances. However, once the adsorption capacity of the filler is approached or reached, the phosphorus removal efficiency of the artificial wetland is greatly reduced, and even the phosphorus release phenomenon occurs. In addition, phosphorus is distributed and dispersed in the wetland, and efficient recovery of phosphorus cannot be realized.
In addition, in the sewage treatment process, phosphorus can be converted into phosphate precipitates such as iron phosphate, aluminum phosphate, magnesium ammonium phosphate, hydroxyapatite and the like, so that the recovery of phosphorus is realized. The phosphorus content of the obtained product is high based on a magnesium phosphorus recovery technology by adding chemical reagents such as sodium hydroxide, magnesium salt and the like; however, the addition of chemical reagents is costly, complicated to operate, and inconvenient for large-scale application.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a galvanic cell type constructed wetland system with a phosphorus recovery function.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the embodiment of the invention provides a galvanic cell type artificial wetland system with a phosphorus recovery function, which adopts an undercurrent artificial wetland system and comprises a substrate layer, wherein at least one galvanic cell system is arranged in the substrate layer, the galvanic cell system takes a magnesium electrode as a negative electrode and an inert electrode as a positive electrode, and the magnesium electrode is connected with the inert electrode through a lead;
the inert electrode is inserted into the substrate layer, the magnesium electrode is inserted into a phosphorus recovery device in the substrate layer, and phosphorus is enriched on the magnesium electrode through oxidation reaction.
As a further implementation manner, the phosphorus recovery device comprises an inner sleeve and an outer sleeve which are sleeved together, and the bottoms of the inner sleeve and the outer sleeve are closed; the inner sleeve is filled with matrix layer.
As a further implementation, the magnesium electrode is inserted into a matrix layer in the inner sleeve, and neither the inert electrode nor the magnesium electrode is fully inserted into the matrix layer.
As a further implementation mode, the distance between the magnesium electrode and the inert electrode is less than or equal to the submerging length of the electrode in the substrate layer and is greater than or equal to 1/2 of the submerging length of the electrode;
the inner sleeve is higher than the magnesium electrode submerging height.
As a further realization mode, the side walls of the inner sleeve and the outer sleeve are provided with a plurality of through holes, and a containing space is formed between the outer sleeve and the inner sleeve.
As a further implementation, when the number of the primary battery systems is plural, the interval between any two primary battery systems is larger than the electrode immersion length.
As a further implementation mode, an ammeter is connected between the magnesium electrode and the inert electrode.
As a further implementation, the inert electrode is a graphite electrode.
As a further implementation mode, one side of the substrate layer is provided with a water inlet system, and the other side of the substrate layer is provided with a water outlet system.
As a further implementation, the water intake system employs intermittent flow.
The invention has the following beneficial effects:
(1) according to the invention, a magnesium cathode primary battery system is coupled in the constructed wetland system, the magnesium electrode is subjected to oxidation reaction to release magnesium ions, and the magnesium ions are combined with phosphate ions moving to the magnesium electrode to generate phosphate precipitates such as magnesium ammonium phosphate and the like, so that phosphorus is enriched near the magnesium electrode, phosphorus resources can be effectively removed and recovered, the problems of saturated adsorption and difficult phosphorus resource recovery in the conventional constructed wetland technology are solved, and the sustainable phosphorus resource is realized.
(2) One or more primary battery systems are arranged in the artificial wetland system, so that electric energy is generated while phosphorus is recovered, energy recycling is realized, the energy consumption of sewage treatment is reduced, and the universality and the environmental friendliness of sewage treatment of the artificial wetland are improved.
(3) The phosphorus recovery device comprises an inner sleeve and an outer sleeve which are sleeved together, wherein a magnesium electrode is placed in the inner sleeve, artificial wetland filler is filled in the inner sleeve, and no filler is filled between the inner sleeve and the outer sleeve, so that the resistance in the process of lifting the inner sleeve is reduced.
(4) The invention is provided with the water inlet system and the water discharge system, so that the water in the output artificial wetland matrix forms circulation, phosphorus in sewage is enriched, precipitated and recovered through the phosphorus recovery device, the water output by the water inlet system adopts intermittent flow, so that the artificial wetland is a still water system, water does not flow, and free diffusion of phosphate radical anions to the magnesium cathode is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic block diagram of the present invention according to one or more embodiments;
FIG. 2 is a schematic illustration of a phosphorus recovery apparatus according to one or more embodiments of the present invention;
the device comprises a wetland plant, a water inlet, a magnesium electrode, a phosphorus recovery device, a substrate layer, an ammeter, a graphite electrode, a water outlet, an inner sleeve, an outer sleeve, a containing space, a cushion layer and a water outlet, wherein the wetland plant comprises 1, the wetland plant, 2, the water inlet, 3, the magnesium electrode, 4, the phosphorus recovery device, 5, the substrate layer, 6, the ammeter, 7, the graphite electrode, 8, the water outlet, 9, the inner sleeve, 10, the outer sleeve, 11, the containing space, 12 and the cushion layer.
Detailed Description
The first embodiment is as follows:
the embodiment provides a galvanic cell type artificial wetland system with a phosphorus recovery function, which adopts an undercurrent artificial wetland system, couples a magnesium cathode galvanic cell system in the artificial wetland system, and a magnesium cathode generates an oxidation reaction to release magnesium ions, and reacts with phosphate ions moving to the magnesium cathode to generate insoluble precipitates, so that phosphorus is enriched near the magnesium cathode, and the efficient recovery of the phosphorus is realized.
Specifically, as shown in fig. 1, the artificial wetland system of the present embodiment includes a substrate layer 5, wetland plants 1, a galvanic cell system, a phosphorus recovery device 4, a water inlet system, and a water outlet system, wherein one or more of the galvanic cell systems are disposed in the substrate layer 5, and the interval between any two galvanic cell systems is greater than the electrode immersion length, so as to avoid the mutual influence between the galvanic cell systems.
The material of the substrate layer 5 is non-conductive materials such as gravel, volcanic rock, ceramsite and the like.
The constructed wetland system of the embodiment is further provided with wetland plants 1, wherein the wetland plants 1 are uniformly planted at a planting density of 9-25 plants/square meter by adopting any one or a combination of several of reed, calamus, cattail and iris.
Further, the galvanic cell system comprises a magnesium electrode 3 and an inert electrode, wherein the inert electrode is used as a positive electrode, the magnesium electrode 3 is used as a negative electrode, in the embodiment, the inert electrode is a graphite electrode 7, and the graphite electrode 7 is vertically inserted into the substrate layer 5 and is not completely immersed in the substrate layer 5; the magnesium electrode 3 is vertically inserted into the substrate layer 5 in the phosphorus recovery device 4, and the magnesium electrode 3 and the graphite electrode 7 are immersed to the same depth.
In the embodiment, the immersion length of the magnesium electrode 3 and the graphite electrode 7 is 2/3 of the depth of the artificial wetland (the depth of the substrate layer 5), and the length outside the substrate layer 5 is 5 cm; the distance between the magnesium electrode 3 and the graphite electrode 7 is less than or equal to 1/2, the electrode immersion length is more than or equal to the electrode immersion length, so as to ensure the electrolysis effect of the galvanic cell system.
It will be appreciated that in other embodiments, the immersion length of the magnesium electrode 3 and the graphite electrode 7 may also be adapted.
The magnesium electrode 4 of this embodiment is a pure magnesium or magnesium alloy electrode plate with a magnesium content of 95% or more.
Furthermore, one ends of the magnesium electrode 3 and the graphite electrode 7, which are positioned outside the substrate layer 5, are respectively connected with electrode clamps, a lead is connected between the electrode clamps of the magnesium electrode and the graphite electrode, an ammeter 6 is connected on the lead, and the current generated by the galvanic cell system is detected through the ammeter 6.
In this embodiment, the low wattage LED lamp may be connected in series to the wire.
A water inlet system is arranged on one side of the substrate layer 5, a water outlet system is arranged on the other side of the substrate layer, the water inlet system comprises a water inlet 2 and a water inlet pipeline connected with the water inlet 2, and the water outlet system comprises a water outlet 8 and a drainage pipeline connected with the water outlet; the installation height of the water inlet 2 is higher than that of the water outlet 8, sewage to be treated is injected into the matrix layer 5 through the water inlet system, and water after phosphorus recovery is discharged through the drainage system.
Wherein, the inlet water adopts intermittent flow to ensure that ions are diffused in the system and are not influenced by the flow field.
Further, as shown in fig. 2, the phosphorus recovery device 4 comprises an inner sleeve 9, an outer sleeve 10 and a cushion layer 12, wherein the outer sleeve 10 has a diameter larger than that of the inner sleeve 9, the inner sleeve 9 is sleeved in the outer sleeve 10, and a receiving space 11 is formed between the inner sleeve 9 and the outer sleeve 10.
The outer sleeve 10 and the inner sleeve 9 are flush at the bottom and are closed off by a cushion 12, forming an open top, closed bottom structure. The side walls of the outer sleeve 10 and the inner sleeve 9 are both provided with a plurality of through holes which are densely distributed, and the size of the through holes is required to be incapable of allowing the artificial wetland filler to pass through. The sewage permeates into the phosphorus recovery device 4 through the through holes, and the sewage entering through the through holes of the outer sleeve 10 is stored in the accommodating space 11.
The inner sleeve 9 is filled with a substrate layer 5, the height of the inner sleeve 9 is greater than the immersion height of the magnesium electrode 3, namely, the bottom end of the magnesium electrode 3 has a certain distance from the cushion layer 12; the inner sleeve 9 has a diameter larger than the diameter of the magnesium electrode 3.
In the embodiment, the inner wall of the inner sleeve 9 is 5cm away from the outer wall of the magnesium electrode 3, and the outer wall of the inner sleeve 9 is 5cm away from the inner wall of the outer sleeve 10; the diameter of the cushion layer 12 is the same as the diameter of the outer sleeve 10, and the height is 5 cm.
Of course, in other embodiments, the distance between the inner sleeve 9 and the outer sleeve 10, the distance between the inner sleeve 9 and the magnesium electrode 3, the height of the cushion 12 and the like can be adjusted to other values, which are determined by the size requirement of the artificial wetland system.
The outer sleeve 10, the inner sleeve 9 and the cushion layer 12 are made of plastic products with high insulating, load bearing and chemical reaction resistance, such as styrene-acrylonitrile copolymer, polypropylene, and the like.
The use method of the artificial wetland system comprises the following steps:
(1) the outer sleeve 10 is embedded into the wetland substrate layer 5 to a depth higher than the immersed length of the magnesium electrode 3 by 5 cm.
(2) The pad 12 is placed into the outer sleeve 10 and the bottom end of the outer sleeve 10 is sealed.
(3) The inner sleeve 9 is placed in the center of the cushion 12 and the bottom end of the inner sleeve 9 is sealed.
(4) The magnesium electrode 3 is placed in the center of the inner sleeve 9, the inner sleeve 9 is filled with artificial wetland filler, and no filler is filled between the inner sleeve 9 and the outer sleeve 10, so that the resistance in the process of lifting the inner sleeve 9 is reduced.
The magnesium electrode 3 is oxidized to release magnesium ions, and the magnesium ions are combined with phosphate ions moving to the magnesium electrode to generate phosphate precipitates such as magnesium ammonium phosphate and the like, so that phosphorus is enriched near the magnesium electrode 3.
(5) The ammeter 6 shows that when the current is 15% of the initial current, the inner sleeve 9 and the substrate therein are taken out, and the substrate and the surface of the magnesium electrode 3 are rinsed with dilute acid, so that the recovery of phosphorus can be realized.
The embodiment organically combines the artificial wetland and the magnesium primary cell technology, changes the accumulation distribution of phosphorus in the artificial wetland on the basis of strengthening the phosphorus removal of the artificial wetland, efficiently recovers the phosphorus in water, and realizes the recovery of resources; meanwhile, the electric energy is generated, the energy source reutilization is realized, the energy consumption of sewage treatment is reduced, and the universality and the environmental protection of sewage treatment of the artificial wetland are improved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A galvanic cell type artificial wetland system with a phosphorus recovery function is characterized in that an undercurrent artificial wetland system is adopted, the system comprises a substrate layer, at least one galvanic cell system is arranged in the substrate layer, the galvanic cell system takes a magnesium electrode as a negative electrode and an inert electrode as a positive electrode, and the magnesium electrode is connected with the inert electrode through a lead;
the inert electrode is inserted into the substrate layer, the magnesium electrode is inserted into a phosphorus recovery device in the substrate layer, and phosphorus is enriched on the magnesium electrode through oxidation reaction.
2. The galvanic artificial wetland system with phosphorus recovery function of claim 1, wherein the phosphorus recovery device comprises an inner sleeve and an outer sleeve which are sleeved together, and the bottoms of the inner sleeve and the outer sleeve are closed; the inner sleeve is filled with matrix layer.
3. The galvanic artificial wetland system with phosphorus recovery of claim 2, wherein the magnesium electrode is inserted into the matrix layer in the inner sleeve, and neither the inert electrode nor the magnesium electrode is completely inserted into the matrix layer.
4. The galvanic artificial wetland system with phosphorus recovery function of claim 3, wherein the distance between the magnesium electrode and the inert electrode is less than or equal to the submergence length of the electrode in the substrate layer and more than or equal to 1/2 of the submergence length of the electrode;
the inner sleeve is higher than the magnesium electrode submerging height.
5. The galvanic artificial wetland system with phosphorus recovery function according to claim 2, wherein the side walls of the inner sleeve and the outer sleeve are provided with a plurality of through holes, and a containing space is formed between the outer sleeve and the inner sleeve.
6. The constructed wetland system of claim 1, wherein the distance between any two of the plurality of the galvanic cell systems is longer than the electrode immersion length.
7. The galvanic artificial wetland system with phosphorus recovery function of claim 1, wherein an ammeter is connected between the magnesium electrode and the inert electrode.
8. The galvanic artificial wetland system with phosphorus recovery function of claim 1, wherein the inert electrode is a graphite electrode.
9. The galvanic cell-type constructed wetland system with phosphorus recovery of claim 1, wherein the substrate layer is provided with a water inlet system on one side and a water outlet system on the other side.
10. The galvanic artificial wetland system with phosphorus recovery function of claim 9, wherein the water inlet system employs intermittent flow.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116135801A (en) * | 2023-04-18 | 2023-05-19 | 江苏龙腾工程设计股份有限公司 | Rural ecological wetland purification treatment system |
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