CN110980891B - Tower type electric flocculation water treatment device - Google Patents
Tower type electric flocculation water treatment device Download PDFInfo
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- CN110980891B CN110980891B CN201911299325.3A CN201911299325A CN110980891B CN 110980891 B CN110980891 B CN 110980891B CN 201911299325 A CN201911299325 A CN 201911299325A CN 110980891 B CN110980891 B CN 110980891B
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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
- 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
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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
- C02F2101/20—Heavy metals or heavy metal compounds
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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
- C02F2101/30—Organic compounds
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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
- 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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- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses a tower type electric flocculation water treatment device, which comprises a sacrificial electrode, a cathode, a sacrificial electrode inserting plate, an anode, a shell I and a shell II, wherein the shell I is fixed at the lower end of the shell II, a top cover is arranged at the top end of the shell II, a water outlet and a slag discharge port are formed in the upper part of the shell II, one ends of a plurality of sacrificial electrodes are arranged on the top cover, the cathode is fixed at the upper part in the shell II and is positioned below the water outlet, the sacrificial electrode inserting plates are arranged in the shell II at intervals and are positioned below the cathode, the other ends of the sacrificial electrodes penetrate through the cathode and are inserted into the sacrificial electrode inserting plates, the sacrificial electrodes are not in contact with the cathode, the sacrificial electrodes are in ohmic contact with the sacrificial electrode inserting plate, and the anode is fixed in the shell II and is positioned below the sacrificial electrode inserting plate; the lower part of the shell II is provided with a water inlet, a flocculation settling area is arranged in the shell I, and the bottom of the shell I is provided with a sludge discharge port; the device has the advantages of simple structure, easy replacement of the sacrificial electrode and high utilization efficiency; the electric energy utilization efficiency is high.
Description
Technical Field
The invention relates to sewage treatment equipment, which is suitable for treating wastewater containing high-concentration organic matters and heavy metals which are difficult to degrade biochemically, in particular to an electric flocculation treatment device.
Background
The electroflocculation technology is that iron, aluminum and other high-activity flocculation substances generated through electrochemical reaction are subjected to hydrolysis and polymerization reaction in water to generate a series of hydroxides with coprecipitation effect, and the substances can finally remove pollutants in water through adsorption, net capture and other precipitation mechanisms. Meanwhile, tiny bubbles formed by gas generated by the polar plate in the electric flocculation process enable pollutants which are low in density and difficult to precipitate to float to the water surface for removal. In a word, the electric flocculation technology comprises the functions of sedimentation flocculation and air flotation, and has good treatment effect on water bodies which are seriously polluted and contain organic matters and heavy metal ions which are difficult to carry out biochemical treatment.
The electroflocculation technique includes single electrode electroflocculation and double electrode electroflocculation. The single-electrode electric flocculation means that polar plates of an anode and a cathode are directly connected with a power supply, and the electric flocculation is carried out through iron or aluminum ions separated out by the anode made of iron or aluminum when the anode is electrified. The double-electrode electric flocculation is that an iron or aluminum electrode which is not connected with a power supply and is directly connected with two stages is inserted between a dimensionally stable anode and a cathode which are connected with an external power supply to be used as a sacrificial electrode, and one end of the inserted sacrificial electrode, which is close to the cathode, is polarized to be an anode to carry out the electric flocculation process under the action of an electric field. The double-electrode mode has better treatment effect than single-electrode electrocoagulation, but because the sacrificial electrode is not directly connected with an external power supply, the resistance of the system is larger, so that the electric energy utilization efficiency is lower, and the operation cost is higher. Although the electrical conductivity of the system can be reduced and the electrical energy utilization efficiency can be improved by reducing the distance between the polar plates, the water body mobility is poor, and the blocking phenomenon is easy to occur. In addition, only one side of the sacrificial electrode close to the cathode is induced to be an anode for electrocoagulation, and the other side of the sacrificial electrode is subjected to reduction reaction and only plays a role in electron transfer, so that the utilization degree of the electrode plate is low.
Disclosure of Invention
Aiming at the defects of low utilization efficiency of sacrificial electrodes, larger distance between polar plates and higher energy consumption in a double-electrode electric flocculation method, the invention provides the tower type electric flocculation water treatment device with high electric energy utilization efficiency.
The invention is realized by the following technical scheme:
the tower type electric flocculation water treatment device comprises a sacrificial electrode, a cathode, a sacrificial electrode inserting plate, an anode, a shell I and a shell II, wherein the shell I is fixed at the lower end of the shell II, a top cover is arranged at the top end of the shell II, a water outlet and a slag discharge port are formed in the upper part of the shell II, one ends of a plurality of sacrificial electrodes are arranged on the top cover, the cathode is fixed at the upper part in the shell II and is positioned below the water outlet, the sacrificial electrode inserting plates are arranged in the shell II at intervals and are positioned below the cathode, the other ends of the sacrificial electrodes penetrate through the cathode and are inserted into the sacrificial electrode inserting plates, the sacrificial electrodes are not in contact with the cathode, the sacrificial electrodes are in ohmic contact with the sacrificial electrode inserting plate, and the anode is fixed in; a water inlet is formed in the lower portion of the shell II, and an electrochemical reaction area is formed between an anode and a cathode in the shell II; the inside of the shell I is a flocculation settling zone, and the bottom of the shell I is provided with a sludge discharge port.
The conductive polar plate in the electric flocculation process comprises an anode, a sacrificial electrode inserting plate, a sacrificial electrode and a cathode, wherein the anode is subjected to oxidation reaction to generate oxygen, the sacrificial electrode inserting plate is induced to become the cathode under the action of an electric field and subjected to reduction reaction to generate hydrogen, and the sacrificial electrode in direct ohmic contact with the sacrificial electrode is induced to become the anode and subjected to oxidation reaction to generate active flocculant aluminum ions to participate in the electric flocculation process.
And the shell I and the shell II are fixedly connected through a flange.
The sacrificial electrode is an aluminum electrode or an iron electrode.
And the shell II is provided with a cathode power interface and an anode power interface, and the cathode power interface and the anode power interface are respectively connected with the cathode and the anode.
The anode is an angle-steel-shaped dimensionally stable anode which is an iridium-tantalum electrode, a ruthenium-iridium electrode, a titanium electrode and the like; the opening of the angle steel type anode faces downwards, so that the phenomenon that sediment is accumulated on the polar plate to influence the electric flocculation effect is avoided.
The cathode is a comb-shaped inert electrode, the inert electrode is a graphite electrode, a copper electrode, an aluminum electrode and the like, a plurality of cathode holes are formed in teeth of the inert electrode, and the space between the teeth is 5-10 cm.
The sacrificial electrode plugboards are plate-shaped inert electrodes with a plurality of sacrificial electrode sockets, the inert electrodes are graphite electrodes, copper electrodes, aluminum electrodes and the like, the sacrificial electrode plugboards are vertically fixed above the anode in parallel, the vertical distances between the lower ends of the sacrificial electrode plugboards and the upper surface of the anode are equal, and the distance between the sacrificial electrode plugboards is 8-10 cm, so that the sedimentation and air floatation removal of pollutants are facilitated.
Casing I is the cavity shell that leaks hopper-shaped.
The residue discharge port is a discharge port of air floatation scum, a water discharge pipe is connected to the water discharge port, the water outlet of the water discharge pipe is higher than the water discharge port, and the purified water body can be discharged through the natural overflow effect of the water body.
The top cover is movably connected with the sacrificial electrode, for example, the top cover is in threaded connection, so that the relative position of the top cover is fixed, and the sacrificial electrode can be replaced.
Compared with the prior art, the invention has the remarkable advantages that:
for sacrificial electrodes, the portion induced to become the anode is determined by the density of the electric field in the device and the potential distribution; the more the cathode is close, the more violent the oxidation reaction is, the more aluminum ions are generated; through the design of the cathode holes, the distance between the cathode and the polar plate between the sacrificial electrodes is reduced on the premise of not influencing the flow of the water body.
The sacrificial electrode is connected with the sacrificial electrode inserting plate which plays a role in conducting electricity, under the action of an electric field, the sacrificial electrode is partially induced into an anode to participate in an electric flocculation process, and the sacrificial electrode inserting plate is partially induced into a cathode, so that the utilization efficiency of the sacrificial electrode is improved, the sacrificial electrode is arranged at the top and is convenient to replace, and the use of the device is facilitated.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a schematic top view of the cathode;
FIG. 3 is a schematic top view of a sacrificial electrode plug;
FIG. 4 is a schematic view of an anode structure;
in the figure: 1-a sacrificial electrode; 2-a cathode; 3-sacrificial electrode plug board; 4-an anode; 5-shell I; 6-a sludge discharge port; 7-a top cover; 8-shell II; 9-flocculation settling zone; 10-a water outlet; 11-a slag discharge port; 12-a water inlet; 13-a cathode power interface; 14-cathode holes; 15-sacrificial electrode socket; 16-a drain pipe.
Detailed Description
The invention is explained in more detail below with reference to the figures and examples, without limiting the scope of the invention.
Example 1: as shown in fig. 1, 2, 3 and 4, the tower type electric flocculation water treatment device comprises a sacrificial electrode 1, a cathode 2, a sacrificial electrode inserting plate 3, an anode 4, a shell I5 and a shell II 8, wherein the shell II 8 is a hollow rectangular cavity of 150 cm multiplied by 160 cm multiplied by 60 cm, the shell I5 is fixed at the lower end of the shell II 8 through a flange, a top cover 7 is arranged at the top end of the shell II 8, a water outlet 10 and a slag discharge port 11 are arranged at the upper part of the shell II 8, a water discharge pipe 16 is connected to the water outlet 10, and the position of a water outlet of the water discharge pipe is higher than that of the water outlet; one end of each of 20 sacrificial electrodes 1 is fixed below the inside of the top cover 7 in a threaded connection mode, the cathode 2 is fixed at the upper part of the inside of the shell II 8 and is positioned below the water outlet 10, the cathode is a comb-shaped graphite plate with the thickness of 4 cm, each tooth of the comb-shaped graphite plate is provided with 4 cathode holes 14 (the diameter is 6.5 cm) for penetrating through the sacrificial electrodes 1, the space between the teeth is 8 cm, and the width of each tooth is 17 cm; 4 sacrificial electrode plugboards 3 are vertically fixed in the shell II 8 in parallel at intervals of 9.6 cm and are positioned below the cathode 2, and the sacrificial electrode plugboards 3 are graphite plates with the thickness of 3 cm and are provided with sacrificial electrode sockets 15; the other ends of the 20 sacrificial electrodes 1 penetrate through the cathode holes 14 on the cathode and are inserted into the sacrificial electrode sockets 15 on the 4 sacrificial electrode plug boards 3, the sacrificial electrodes 1 are not in contact with the cathode, the sacrificial electrodes 1 are in ohmic contact with the sacrificial electrode plug boards 3 and are induced by an electric field to form anodes, active flocculant aluminum ions are generated to participate in flocculation and sedimentation reactions, the sacrificial electrodes are made of aluminum strips, and the diameter of each sacrificial electrode is 2 cm; the anode 4 is fixed in the shell II 8 and is positioned below the sacrificial electrode inserting plate 3, the anode 4 is an angle steel iridium tantalum electrode, the thickness of the anode 4 is 1 cm, the opening of the angle steel anode faces downwards to avoid sediment from being accumulated on a polar plate, the vertical distance between the lower end of the sacrificial electrode inserting plate 3 and the upper surface of the anode 4 is 10 cm, the upper ends of the 4 sacrificial electrode inserting plates 3 are positioned on the same plane and are positioned at the midpoint position between the cathode 2 and the anode 4; a cathode power supply interface 13 and an anode power supply interface are arranged on the shell II 8, and the cathode power supply interface and the anode power supply interface are respectively connected with the cathode and the anode;
the shell I5 is a hollow funnel-shaped shell of 60 cm, the lower part of the shell II 8 is provided with a water inlet 12, and an electrochemical reaction area is arranged between an anode and a cathode in the shell II 8; be flocculation settling zone in casing I5, casing I5 bottom is provided with row mud mouth 6, is provided with the valve on the row mud mouth.
When the device is used for treating the food industrial wastewater (the initial COD is 1430 mg/L, the concentration of phosphate radical is 12.4 mg/L, and the turbidity is 310 NTU), when in use, the sewage to be treated is input from the water inlet 12 and enters an electrochemical reaction area of the device from the vicinity of the anode 4, and a large amount of active flocculant generated by the sacrificial electrode 1 after electrification is fully mixed with pollutants in a water body, so that the pollutants are precipitated to the bottom through flocculation and sedimentation; the surface of the sacrificial electrode inserting plate 3 is subjected to reduction reaction to generate hydrogen, and the hydrogen participates in the air floatation removal process of pollutants; the surface of the anode 4 is oxidized to generate oxygen which participates in the air floatation removal process of pollutants; above the cathode 2, the purified water is discharged through the water discharge opening 10 and the water discharge pipe 16; scum of the air floatation is discharged through a scum outlet 11, and settled flocs are discharged through a sludge outlet 6; the sacrificial electrode 1 can be drawn out from the top of the device for replacement after being consumed; after the wastewater is treated, the removal rate of COD is more than 70%, the removal rate of turbidity is more than 98%, and the removal rate of phosphate radical is more than 99%; and because of the existence of the sacrificial electrode plugboard 3, the sacrificial electrode 1 at the lower part of the cathode 2 is completely induced to be in an anode state under the action of an electric field, and an electrochemical reaction is carried out to generate an active flocculant to participate in the electric flocculation effect, compared with the traditional double-electrode electric flocculation, the utilization rate of the sacrificial electrode is improved by 50%.
the device is adopted to treat the food industry wastewater, the using method is the same as that of the embodiment 1, the COD removal rate of the treated wastewater is more than 75%, the turbidity removal rate is more than 93%, and the phosphate radical removal rate is more than 99%.
Claims (9)
1. A tower type electric flocculation water treatment device is characterized in that: comprises a sacrificial electrode (1), a cathode (2), a sacrificial electrode plugboard (3), an anode (4), a shell I (5) and a shell II (8), wherein the shell I (5) is fixed at the lower end of the shell II (8), a top cover (7) is arranged at the top end of the shell II (8), a water outlet (10) and a slag discharge port (11) are arranged at the upper part of the shell II (8), one ends of a plurality of sacrificial electrodes (1) are arranged on the top cover (7), the cathode (2) is fixed at the upper part in the shell II (8) and is positioned below the water outlet (10), the sacrificial electrode plugboards (3) are fixed in the shell II (8) at intervals and are positioned below the cathode, the other ends of the sacrificial electrodes (1) penetrate through the cathode and are inserted into the sacrificial electrode plugboards (3), the sacrificial electrodes (1) are not in contact with the cathode, and the sacrificial electrodes (1) are in ohmic contact with the sacrificial electrode plugboards (3), the anode (4) is fixed in the shell II (8) and is positioned below the sacrificial electrode inserting plate (3); the lower part of the shell II (8) is provided with a water inlet (12), and an electrochemical reaction area is arranged between an anode and a cathode in the shell II (8); a flocculation settling area is arranged in the shell I (5), a sludge discharge port (6) is formed in the bottom of the shell I (5), and a valve is arranged on the sludge discharge port;
the anode (4) is an angle-steel-shaped dimensionally stable anode;
the sacrificial electrode plugboard (3) is a plate-shaped inert electrode with a plurality of sacrificial electrode sockets (15), the sacrificial electrode plugboards (3) are vertically fixed above the anode (4) in parallel, the vertical distance between the lower ends of the sacrificial electrode plugboards (3) and the upper surface of the anode (4) is equal, the distance between the sacrificial electrode plugboards (3) is 8-10 cm, and the vertical distance between the sacrificial electrode plugboards (3) and the anode (4) is 5-10 cm.
2. The tower-type electric flocculation water treatment device of claim 1, wherein: the shell I (5) and the shell II (8) are fixedly connected through a flange.
3. The tower-type electric flocculation water treatment device of claim 1, wherein: the sacrificial electrode (1) is an aluminum electrode or an iron electrode.
4. The tower-type electric flocculation water treatment device of claim 1, wherein: and a cathode power interface (13) and an anode power interface are arranged on the shell II (8), and the cathode power interface and the anode power interface are respectively connected with the cathode and the anode.
5. The tower-type electric flocculation water treatment device of claim 1, wherein: the dimensionally stable anode is one of an iridium-tantalum electrode, a ruthenium-iridium electrode and a titanium electrode.
6. The tower-type electric flocculation water treatment device of claim 1, wherein: the cathode is a comb-shaped inert electrode, a plurality of cathode holes (14) are formed on teeth of the cathode, and the space between the teeth is 5-10 cm.
7. The tower-type electric flocculation water treatment device of claim 1, wherein: the inert electrode is one of a graphite electrode, a copper electrode and an aluminum electrode.
8. The tower-type electric flocculation water treatment device of claim 1, wherein: the water outlet (10) is connected with a drain pipe (16), and the position of the water outlet of the drain pipe is higher than the water outlet.
9. The tower-type electric flocculation water treatment device of claim 1, wherein: the shell I (5) is hollow and funnel-shaped.
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| CN201911299325.3A CN110980891B (en) | 2019-12-17 | 2019-12-17 | Tower type electric flocculation water treatment device |
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| CN112390478A (en) * | 2020-12-28 | 2021-02-23 | 昆明理工大学 | Device for efficiently treating aged landfill leachate through biological membrane and electric flocculation |
| CN112978871A (en) * | 2021-02-25 | 2021-06-18 | 西安建筑科技大学 | Device based on electrooxidation coupling electrocoagulation handles rubbish leachate membrane concentrate |
| CN113860645A (en) * | 2021-10-14 | 2021-12-31 | 江苏京源环保股份有限公司 | Method for treating high-concentration degradation-resistant organic wastewater |
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