CN212954436U - Biochemical electrolytic dephosphorization device with low energy consumption and anti-blockage function - Google Patents
Biochemical electrolytic dephosphorization device with low energy consumption and anti-blockage function Download PDFInfo
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- CN212954436U CN212954436U CN202021142170.0U CN202021142170U CN212954436U CN 212954436 U CN212954436 U CN 212954436U CN 202021142170 U CN202021142170 U CN 202021142170U CN 212954436 U CN212954436 U CN 212954436U
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Abstract
The application discloses a low-energy-consumption anti-clogging biochemical electrolytic phosphorus removal device, which comprises a box body for containing electrolyte solution and electrode plates arranged in the box body, wherein the electrode plates are Fe series electrode plates or/and Al series electrode plates, and the electrode plates are externally connected with a power supply through wires; the bottom surface and at least part of the side surface of the box body are provided with windows formed by cation exchange membranes. The method comprises the steps of firstly opening the side face of a box body, placing a layer of silica gel on the edge of the opening, placing a cation exchange membrane on the silica gel, placing a layer of silica gel again at the same position, finally adding an organic glass sheet, connecting the organic glass sheet and the box body through bolts and nuts, and carrying out the same operation on other side faces and the bottom face of a cylinder body by the same method. The biochemical electrolytic dephosphorization device reduces energy consumption and solves the problem of electrode plate blockage.
Description
Technical Field
The application relates to the field of water treatment, in particular to a biochemical electrolytic phosphorus removal device with low energy consumption and anti-blocking function.
Background
Phosphorus is a key nutrient substance causing water eutrophication, so that the removal of phosphorus from wastewater is a key for solving the water eutrophication. At present, the commonly adopted sewage phosphorus and phosphorus removal methods at home and abroad mainly comprise a chemical phosphorus and phosphorus removal method and a biological phosphorus removal method. However, the effluent of the biological phosphorus removal method generally hardly reaches the effluent standard of 0.5 mg/L. Chemical phosphorus removal in small-scale distributed sewage treatment equipment, a medicament dissolving tank, a solution delivery pump and a stirring mode make the device too complex and difficult to operate and manage. Electrolytic phosphorus removal is born at this time, the device has a simple structure, is convenient to operate and easy to manage, and more importantly, the treatment effect is good, and the effluent can reach the effluent standard. However, with the large application of the electrolytic phosphorus removal device, the electrode plates are easy to passivate, the problems of scum and the like generated in the electrolytic process are gradually revealed, the most important is that the electrolytic phosphorus removal device is used for treating domestic sewage, and the energy consumption required in the electrolytic process is very high due to the very low salinity in the domestic sewage, so that the electrolytic phosphorus removal device which can achieve the corresponding requirements in treatment effect and does not generate the corresponding problems has important significance for popularization and application.
The patent application with the publication number of CN102976453A discloses an electrolytic phosphorus removal device, belongs to the wastewater treatment technology and equipment, and particularly relates to an electrolytic phosphorus removal device with an aeration device. The electrolytic dephosphorization equipment is characterized in that: one side of the upper part of the electrolytic cell is provided with a water inlet pipe, the lower part of the other side is provided with a water outlet pipe, a round electrode plate arranged on a rotating shaft is positioned above the electrolytic cell, one electrode plate is an aluminum plate, the other electrode plate is an iron plate, the electrode plate is connected with a direct current power supply, the bottom of the electrolytic cell is provided with an aeration device, and the aeration device is connected with an air blower through a gas pipe. However, the electrode plate in the device is easy to passivate, so that the electrolytic effect is influenced; and scum generated by electrolysis is accumulated between the electrode plates, so that higher voltage or current is required to generate the previous electrolysis effect, and the energy consumption is increased. The patent with publication number CN203715345U discloses an electrolytic phosphorus removal device, which improves the electrolytic efficiency, eliminates the water color change caused by the redundant dissolved iron ions, and can achieve better descaling effect; the device comprises an electrolytic bath, a regulating box and an air pump, wherein a phosphorus removal cavity is arranged in the electrolytic bath, a water inlet pipe and a water outlet pipe are arranged on the electrolytic bath, the water inlet pipe and the water outlet pipe are communicated with the phosphorus removal cavity, an iron/aluminum electrode combination, an aeration pipe, a lifting controller and a descaling device are arranged in the phosphorus removal cavity, the iron/aluminum electrode combination is electrically connected with the regulating box, the aeration pipe is provided with a plurality of through holes, the aeration pipe is arranged on the inner bottom wall of the phosphorus removal cavity, and the output end of the air pump penetrates through the electrolytic bath and is; the descaling device is arranged at the output end of the lifting controller and is tightly attached to the iron/aluminum electrode combination, the bottom of the electrolytic bath is provided with a sludge outlet pipe, and the sludge outlet pipe is communicated with the dephosphorization cavity. However, the device cannot realize self cleaning, needs manual operation and wastes time and labor; and scum generated by electrolysis is accumulated between the electrode plates, so that the electrolysis effect is reduced, and further the energy consumption is increased. Patent publication No. CN205856074U provides an electrolytic phosphorus removal device. The electrolytic phosphorus removal device consists of a water inlet pipe, an aeration tank, an aeration device, a fan, a water outlet pipe, a sampling pump, a total phosphorus on-line monitor, a programmable logic controller, a direct-current power supply, an aluminum plate electrode and an iron plate electrode. The device can continuously release aluminum ions or iron ions, and the purpose of removing total phosphorus is achieved through phosphate precipitation, adsorption and air flotation. However, the electrode plate in the device is easy to passivate, so that the electrolytic effect is influenced; and dross generated by electrolysis is accumulated between the electrode plates to greatly reduce the electrolysis effect, so that only voltage or current can be increased to achieve the expected effect, which results in increase of energy consumption.
SUMMERY OF THE UTILITY MODEL
The application provides a biochemical electrolytic dephosphorization device, solves the electrode slice and blocks up the problem when reducing the energy consumption.
The low-energy consumption anti-clogging biochemical electrolytic phosphorus removal device comprises a box body for containing electrolyte solution and electrode plates arranged in the box body, wherein the electrode plates are Fe series electrode plates or/and Al series electrode plates, and the electrode plates are externally connected with a power supply through wires; the bottom surface and at least part of the side surface of the box body are provided with windows formed by cation exchange membranes.
The method for manufacturing the cation exchange membrane window comprises the following steps: the method comprises the steps of firstly opening the side face of a box body, placing a layer of silica gel on the edge of the opening, placing a cation exchange membrane on the silica gel, placing a layer of silica gel again at the same position, finally adding an organic glass sheet, connecting the organic glass sheet and the box body through bolts and nuts, and carrying out the same operation on other side faces and the bottom face of a cylinder body by the same method.
Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.
Optionally, the electrode plates comprise an anode electrode plate and a cathode electrode plate, the anode electrode plate is externally connected with the positive electrode of the power supply, and the cathode electrode plate is externally connected with the negative electrode of the power supply; the anode electrode plate and the cathode electrode plate are distributed at intervals; the gap between the electrode plates is 1-3 cm.
The side surface of the box body is provided with a window formed by a cation exchange membrane, and it can be understood that part of or all of the side surface of the box body is provided with the window formed by the cation exchange membrane. Optionally, all sides of the box body are provided with windows formed by cation exchange membranes.
Optionally, the ratio of the sum of the area of the single-sided membrane of the cation exchange membrane to the area of the single-sided surface of the single electrode plate is 1: 1 to 2.
Optionally, the ratio of the volume of the box body to the sum of the single-side areas of all the electrode plates is 1m3：5～10m2。
Optionally, the ratio of the sum of the area of the single-sided membrane of the cation exchange membrane to the treated water amount is 1m2： 10～20m3/d。
The low-energy consumption anti-clogging biochemical electrolytic phosphorus removal device comprises a box body, and an electrolyte solution and an electrode plate which are arranged in the box body, wherein the electrode plate is externally connected with a power supply through a lead; the bottom surface and the side surface of the box body are provided with windows formed by cation exchange membranes.
Optionally, an electrolyte solution injection port with a sealing cover is arranged on the top cover of the box body.
Optionally, the anion in the electrolyte solution is SO4 2-Or/and NO3 2-(ii) a The concentration of the anion is 1000-20000 mg/l.
Compared with the traditional electrolytic phosphorus removal device, the device has at least one of the following advantages:
(1) because the aluminum ions required by electrolysis are constant, the current is constant, and at constant current, the electrode reacts in the electrolyte solution to reduce the overpotential of the solution, further reduce the required applied voltage and reduce the energy consumption. In addition, the lower voltage ensures the effectiveness of aluminum corrosion reaction and avoids energy waste caused by hydrogen evolution and oxygen evolution reaction.
(2) The sewage and the reaction device are separated, and the blockage of the electrode plates caused by the sludge in the water entering the electrode plate gaps can be avoided.
(3) The whole structure of the equipment is simple, the management is more convenient, and the operation cost is lower.
Drawings
FIG. 1 is a schematic structural diagram of the biochemical electrolytic dephosphorization apparatus for sewage treatment.
The reference numerals in the figures are illustrated as follows:
1-box 2-electrolyte solution 3-electrode slice
4-electric lead 5-sewage 6-electrolysis produced Al3+Or/and Fe3+
7-H in Sewage+8-power supply 9-cation exchange membrane
10-electrolyte solution injection port
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in figure 1, the biochemical electrolytic dephosphorization device with low energy consumption and anti-clogging comprises a box body 1, wherein a window which is sealed by a cation exchange membrane 9 is arranged on the bottom surface and part or all of the side surfaces of the box body 1, and an electrolyte solution injection port 10 with a sealing cover is arranged on the top cover of the box body. The electrode plate 3 is arranged in the box body 1, the electrode plate 3 comprises an anode electrode plate and a cathode electrode plate, the anode electrode plate is externally connected with the anode of the power supply 8 through an electric lead 4, and the cathode electrode plate is externally connected with the cathode of the power supply 8 through the electric lead 4; the anode electrode plate and the cathode electrode plate are distributed at intervals. The material of the electrode plate includes but is not limited to one or two of Fe and Al.
One method of making a cation exchange membrane window comprises: the method comprises the steps of firstly opening the side face of a box body, placing a layer of silica gel on the edge of the opening, placing a cation exchange membrane on the silica gel, placing a layer of silica gel again at the same position, finally adding an organic glass sheet, connecting the organic glass sheet and the box body through bolts and nuts, and carrying out the same operation on other side faces and the bottom face of a cylinder body by the same method.
When in use, electrolyte solution is injected into the box body, and the electrolytic phosphorus removal device is suspended in the sewage 5 to be treated, so that the cation exchange membrane is immersed in the sewage 5.
The device has the main principle that: when energized, Al is generated at the anode electrode3+Or/and Fe3+，Al3+Or/and Fe3+Enters the sewage through the cation exchange membrane and is mixed with PO in the sewage4 3-Generates incompatible compounds in a combined manner, and then separates the substances from the sewage through solid-liquid separation, thereby achieving the aim of removing phosphorus, namely H in the sewage+Then the hydrogen is gathered near the cathode of the electrode through the cation exchange membrane, and then the hydrogen is generated. The salt content in the sewage is generally low, so the conductivity of the sewage as electrolyte is very low, and the energy consumption of the traditional electrolytic phosphorus removal device is large. However, the electrolyte in the box body of the device is separated from the sewage through the cation exchange membrane, so that when the electrolytic effect is basically the same, the device can reduce the overpotential of the solution, reduce the voltage required to be applied by electrolysis and reduce the energy consumption because the concentration of the electrolyte solution in the device is higher. In addition, the lower voltage ensures the effectiveness of aluminum corrosion reaction and avoids energy waste caused by hydrogen evolution and oxygen evolution reaction. And sewage and the reaction device are separated, so that the phenomenon that sludge in water enters the gaps of the electrode plates to cause the blockage of the electrode plates can be avoided.
The gap between the electrode plates is set in consideration of the electrolysis efficiency, the maximum utilization of the electrode plates and the blockage problem between the electrode plates, and in one embodiment, the gap between the electrode plates is 1-3 cm, and the gap refers to the distance between any two adjacent electrode plates. If the electrode sheet gap is too large, the difficulty of electron transfer increases, and if the electrode sheet gap is too small, the dross generated by the electrode may block it. Under this setting gap, further solve the jam problem between the electrode slice in this application.
The side surface of the box body is provided with a window formed by a cation exchange membrane, and it can be understood that part of or all of the side surface of the box body is provided with the window formed by the cation exchange membrane. In one embodiment, the housing 1 is provided with windows made of cation exchange membranes 9 on all sides.
The ratio of the area of the cation exchange membrane to the area of the electrode plate has a certain influence on the dephosphorization effect, and if the ratio is too large, the area of the ion exchange membrane is wasted; if the ratio is too small, the electron exchange may be affected, and the phosphorus removal effect may be affected. Thus, in one embodiment, the ratio of the total area of the single-sided membrane of the cation exchange membrane to the area of the single-sided surface of the single electrode sheet is 1: (1-2).
The proportion between the volume of the reactor box body and the area of the electrode plate has a certain relation with the dephosphorization effect, if the ratio is too large, the electrons generated by electrolysis are insufficient, and the electrolysis effect is further influenced; if the ratio is too small, the number of electrode plates will be wasted. Therefore, in one embodiment, the ratio of the volume of the case 1 to the sum of the single-sided areas of all the electrode sheets 3 is 1m3：(5～10)m2。
If the number of the electrode plates is too large, the electrode plates are wasted; if the number of electrode plates is too small, the electrolysis efficiency is affected. The volume of the box body is assumed to be 0.05-0.5 m3In one embodiment, the number of the electrode sheets is 2 to 20.
The relation between the area of the cation exchange membrane and the water quantity to be treated has a certain relation with the dephosphorization effect, and if the ratio is too large, the waste of the area of the ion exchange membrane is caused; if the ratio is too small, the problem of insufficient electrons generated by electrolysis is caused, and the phosphorus removal effect is further influenced. Thus, in one embodiment, the ratio of the sum of the area of the single-sided membranes of the cation exchange membrane to the amount of water treated is 1m2：(10～20)m3/d。
Electrolyte solution is stored in the box body, the electrolyte solution contains anion solution, a certain relation also exists between the concentration of the anion solution and the dephosphorization effect, and if the anion concentration is too high, salt waste can be caused; if the concentration of the anions is too low, the conductivity of the electrolyte solution is too low, and the phosphorus removal effect is affected. Thus, in one embodiment, the anion in the electrolyte solution is SO4 2-Or/and NO3 2-Performing the following steps; the concentration of the anion is 1000-20000 mg/l.
The material of the reactor box body comprises but is not limited to one or a combination of organic glass, glass fiber reinforced plastic and UPVC.
The application discloses biochemical electrolytic dephosphorization device that low energy consumption prevents blockking up, its working procedure includes:
(1) placing the assembled electrolytic phosphorus removal device in sewage, injecting an electrolyte solution from an electrolyte solution injection port, and turning on a switch of an external power supply 8;
(2) the aluminum electrode sheet of the anode is electrolyzed to generate Al3+(or Fe electrode plate is electrolyzed to generate Fe3+) And enters the sewage through the cation exchange membrane and is mixed with PO4 in the sewage3-Generating an incompatible compound by combination so as to achieve the aim of removing P;
(3) at the same time, H in the sewage +7, entering an electrolysis device through a cation exchange membrane to generate hydrogen at a cathode;
(4) and (5) exchanging the positive electrode and the negative electrode of the power supply 8 at intervals of 30-60 min, and circulating the steps (2) - (4).
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features. When technical features in different embodiments are represented in the same drawing, it can be seen that the drawing also discloses a combination of the embodiments concerned.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application.
Claims (7)
1. The low-energy consumption anti-clogging biochemical electrolytic phosphorus removal device is characterized by comprising a box body for containing electrolyte solution and electrode plates arranged in the box body, wherein the electrode plates are Fe series electrode plates or/and Al series electrode plates, and the electrode plates are externally connected with a power supply through wires; the bottom surface and at least part of the side surface of the box body are provided with windows formed by cation exchange membranes.
2. The biochemical electrolytic dephosphorization device according to claim 1, wherein the electrode plates comprise an anode electrode plate and a cathode electrode plate, the anode electrode plate is externally connected with a positive electrode of a power supply, and the cathode electrode plate is externally connected with a negative electrode of the power supply; the anode electrode plate and the cathode electrode plate are distributed at intervals; the gap between the electrode plates is 1-3 cm.
3. The biochemical electrolytic dephosphorization apparatus according to claim 1, wherein all sides of the tank body are provided with windows formed by cation exchange membranes.
4. The biochemical electrolytic dephosphorization device according to claim 1, wherein the ratio of the sum of the area of the single-sided membrane of the cation exchange membrane to the area of the single-sided electrode sheet is 1: 1 to 2.
5. The biochemical electrolytic dephosphorization apparatus according to claim 1, wherein the ratio of the volume of the tank body to the sum of the single-sided areas of all electrode plates is 1m3：5～10m2。
6. The biochemical electrolytic dephosphorization apparatus according to claim 1, wherein the ratio of the sum of the area of the single-sided membrane of the cation exchange membrane to the amount of the treated water is 1m2：10～20m3/d。
7. The biochemical electrolytic dephosphorization apparatus according to claim 1, wherein a top cover of the tank body is provided with an electrolyte solution injection port with a sealing cover.
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| CN202021142170.0U CN212954436U (en) | 2020-06-18 | 2020-06-18 | Biochemical electrolytic dephosphorization device with low energy consumption and anti-blockage function |
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| CN202021142170.0U CN212954436U (en) | 2020-06-18 | 2020-06-18 | Biochemical electrolytic dephosphorization device with low energy consumption and anti-blockage function |
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