CN110577261B - Reaction device for iron-carbon micro-electrolysis - Google Patents
Reaction device for iron-carbon micro-electrolysis Download PDFInfo
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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
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
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- C—CHEMISTRY; METALLURGY
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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention discloses a reaction device for iron-carbon micro-electrolysis, which comprises a reaction chamber and an aeration chamber positioned below the reaction chamber, wherein the reaction chamber is separated from the aeration chamber through a screen, the reaction chamber is divided into a multi-stage filling chamber by a plurality of screens with different meshes, iron-carbon filling materials are arranged in the multi-stage filling chamber, a plurality of aeration ports are arranged at the bottom of the aeration chamber, backflow water inlets are arranged on the side walls of the multi-stage filling chamber, the backflow water inlets are connected with water outlets of a backflow pump through a backflow channel, a water inlet of the backflow pump is connected with a water outlet arranged on a material supplementing pool, and a water outlet arranged above a fourth filling chamber is connected with a water inlet arranged on the material supplementing pool through a pipeline; and the side wall of the multistage filling chamber is also provided with an ultrasonic generator. The invention has simple structure, easy operation, higher removal efficiency of COD, ammonia nitrogen and total nitrogen, high utilization rate of the filler, difficult loss, no problems of filler blockage, hardening, passivation and the like, low system investment cost and operation cost and good economic benefit.
Description
Technical Field
The invention relates to the technical field of water treatment equipment, in particular to a reaction device for iron-carbon micro-electrolysis.
Background
Iron-carbon microelectrolysis is a good process for treating wastewater by using a metal corrosion principle method to form a galvanic cell, and is also called an internal electrolysis method, an iron scrap filtration method and the like. As a pretreatment technology before biochemical treatment, the iron-carbon micro-electrolysis technology can not only degrade a large amount of organic matters in the wastewater, but also reduce the toxicity of the organic matters and improve the biodegradability of the wastewater. The method has the advantages of wide application range, good treatment effect, long service life, low cost, convenient operation and maintenance and the like, and has the significance of treating wastes with wastes as a treatment method using the waste iron scraps as raw materials. Due to various advantages, the iron-carbon micro-electrolysis technology is developed very rapidly, and has been applied to wastewater treatment in industries such as printing and dyeing, pharmacy, petrochemical industry and the like at present, and good effects are obtained. However, some existing iron-carbon micro-electrolysis technologies still have certain limitations in practical application.
Chinese patent CN201520576322.0 discloses a novel iron-carbon micro-electrolysis device, which comprises an iron-carbon bed, a central barrel, a water distributor, an aeration pipe, a mud bucket, a cofferdam, a packing layer and an iron-carbon support; the cofferdam is arranged at the upper end of the inner side of the iron-carbon bed; the water distributor is arranged on the central barrel; the central barrel is arranged in the middle of the iron-carbon bed, and the upper end and the lower end of the central barrel are respectively connected with the cofferdam and the iron-carbon bracket; the mud bucket is positioned at the bottom end of the middle part of the iron-carbon bed and is connected with the iron-carbon bracket; the aeration pipe is connected with the water distributor and is arranged on the iron-carbon support. However, the method has the problems of easy blockage and hardening of the filler and the like, and the wastewater treatment effect is seriously influenced. Chinese patent CN201510128960.0 discloses an iron-carbon micro-electrolysis device and a use method thereof, the iron-carbon micro-electrolysis device comprises a pressure atomization system, a micro-electrolysis tower, a stirring impeller, a water distribution system, a water storage tank, a centrifugal dehydrator and a control system, the up-flow water inlet is adopted, the impeller rotates and the annular water distribution pipe uniformly distributes water, the stirring and friction effects of filler and sewage in the horizontal and vertical directions are increased, the common problems of iron-carbon bed layer blockage, hardening, passivation and the like of the existing iron-carbon micro-electrolysis reactor are solved, meanwhile, the effective contact between the waste water and the iron-carbon bed is increased, the treatment effect is enhanced, the invention can also effectively eliminate foams generated in the micro-electrolysis device, and the secondary pollution of iron sludge to the environment is reduced. However, the addition of the stirring apparatus increases the operation and maintenance costs of the apparatus because the apparatus needs to be operated for a long time, and the activation and regeneration of the powdered (granular) iron-carbon filler is difficult. Therefore, the novel iron-carbon micro-electrolysis reactor with good treatment effect and low cost has important development significance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a reaction device for iron-carbon micro-electrolysis, which solves the problems that the existing iron-carbon micro-electrolysis reactor is easy to block and harden fillers, high in operation and maintenance cost, slow in reaction, poor in water treatment effect, low in filler utilization rate and easy to run off, further low in iron-carbon micro-electrolysis reaction efficiency and the iron fillers and the carbon fillers are passivated on the surfaces in the reaction process due to carbon micro-electrolysis reaction.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a reaction unit for indisputable carbon micro-electrolysis, includes the reacting chamber and is located the aeration chamber of reacting chamber below, the reacting chamber is separated by the screen cloth with the aeration chamber, the reacting chamber is separated by the screen cloth of a plurality of different mesh numbers and is set to multistage packing chamber, by being first packing chamber, second packing chamber, third packing chamber and fourth packing chamber respectively from bottom to top in proper order, all be equipped with indisputable carbon filler in the multistage packing chamber, aeration chamber bottom is provided with a plurality of exposure ports, be equipped with the backward flow water inlet on the multistage packing chamber lateral wall, the backward flow water inlet passes through the return line and is connected with the delivery port that sets up on the feeding tank, the delivery port that the fourth packing chamber top set up passes through the pipeline and is connected with the water inlet that sets up on the feeding tank, still be provided with supersonic generator on the lateral wall of multistage packing chamber. Wherein the position of the return water inlet is lower than the height of the filler in each filler chamber. The invention adopts the flow measurement technology to clean the passivated surface layer in time and also clean reaction wastes and residues from the surfaces of the iron filler and the carbon filler in time, thereby keeping higher reaction activity of the surfaces of the iron filler and the carbon filler.
Preferably, the iron-carbon filler is iron, a carbon mixed filler or an iron-carbon composite filler, and the molar ratio of iron element to carbon element in the iron-carbon filler is 1-10: 1 to 5. Because the iron-carbon ratio directly influences the treatment effect of the micro-electrolysis reaction, when the iron-carbon ratio is too high, the residual iron reacts with acidity, the pH value is increased, and the reaction is influenced; too little iron will result in a deficiency of the primary iron-carbon cell and a slowing effect.
Preferably, the screen mesh between the first filling chamber and the second filling chamber is 20-60 meshes; a screen mesh between the second filling chamber and the third filling chamber is 60-100 meshes; the screen mesh between the third filling chamber and the fourth filling chamber is 100-300 meshes, and the screen mesh between the reaction chamber and the aeration chamber is 20-300 meshes. Therefore, the fillers in different filler chambers are distributed according to different particle sizes, and the treatment efficiency of pollutants is improved.
Preferably, the particle size of the iron carbon filler in the first filler chamber is 5-20 meshes, the particle size of the iron carbon filler in the second filler chamber is 20-60 meshes, the particle size of the iron carbon filler in the third filler chamber is 60-100 meshes, and the particle size of the iron carbon filler in the fourth filler chamber is 100-200 meshes. Like this, with the iron-carbon material according to different particle diameter layering, make the pollutant reaction of grading, strengthened the adaptability of reactor to different load waste water, most of useless mud will concentrate on the fourth layer that the filler particle diameter is minimum simultaneously, great specific surface area has increased the area of contact with the pending waste water, has improved the treatment effeciency, and this also has reduced the useless mud clearance degree of difficulty in later stage to a certain extent.
Preferably, the filling rate of the iron-carbon filler in the multistage filler chamber is 40-80%, and the height ratio of the first filler chamber, the second filler chamber, the third filler chamber and the fourth filler chamber is preferably 1:1:1: 2. The lower filling rate can ensure that the reaction of the filler is more uniform, and the reaction speed can be accelerated to a certain extent, but the treatment effect is poor due to too low filling rate, so the filling rate is controlled to be about 60%. The fourth packing chamber takes over the majority of the purification in the reactor and the amount of sludge is greatest, so this layer is preferably twice as high as the other packing chambers.
Preferably, an outlet screen is further arranged at the water outlet on the first filling chamber, and the outlet screen is 20-300 meshes, so that the aperture of the outlet screen can be adjusted to be larger when the passivation layer of the small filler powder and the filler is washed by the lateral flow and needs to be removed in time; when the interception is needed to reduce the loss rate of the filler, the aperture of the outlet screen can be adjusted to be smaller.
Preferably, the reflux ratio of the reaction device is 1-10: 1; the backflow water quantity ratio entering from the backflow water inlet in the first filling chamber, the second filling chamber, the third filling chamber and the fourth filling chamber is 1-10: 1-10: 1-10: 1 to 10. Wherein, the reflux ratio refers to the ratio of the reflux flow of the reaction chamber to the water inflow of the reactor.
Preferably, the feed supplementing pool further comprises an iron-carbon filler, the particle size of the iron-carbon filler is 100-200 meshes, and the molar ratio of iron to carbon is 1-10: 1 to 5.
Preferably, a rotatable stirring shaft is vertically arranged in the aeration chamber, and stirring blades for stirring are radially arranged on the stirring shaft; therefore, the dissolved oxygen in water is greatly improved, the oxidation-reduction reaction is enhanced, and the iron-carbon micro-electrolysis reaction efficiency and the sewage treatment effect are improved. The dissolved air aeration rate in the aeration chamber is 1-5 m 3 /（min.m 3 ) And the content of dissolved oxygen in the multistage packing chamber is 10-20 mg/L.
Preferably, the power of the ultrasonic generator is 0.2-0.5 KW, preferably, the ultrasonic power of the first filling chamber and the ultrasonic power of the second filling chamber are controlled to be 0.3-0.5 KW, the ultrasonic power of the third filling chamber and the ultrasonic power of the fourth filling chamber are controlled to be 0.1-0.3 KW, and further optimization is carried out, wherein the ultrasonic power of the first filling chamber is 0.5KW, the ultrasonic power of the second filling chamber is 0.4KW, the ultrasonic power of the third filling chamber is 0.3KW, and the ultrasonic power of the fourth filling chamber is 0.2 KW.
Preferably, the hydraulic retention time in the reaction device is 2-6 h. The hydraulic retention time specifically refers to the volume of the reaction chamber divided by the inflow rate. The fixed hydraulic retention time can ensure that the wastewater and the iron-carbon filler have sufficient contact time, namely reaction time, so that organic matters in the wastewater can be fully reacted and degraded. If the hydraulic retention time is too short, the reaction is insufficient and the efficiency of organic matter degradation or removal is low.
Preferably, the screen is made of stainless steel, so that the stability of the filler is ensured.
Preferably, the dissolved air aeration device is made of stainless steel or is provided with plastic lining protection measures to prevent corrosion. In addition, other parts contacting with the reaction liquid are made of stainless steel or are provided with plastic lining protection measures.
Drawings
Fig. 1 is a schematic structural diagram of an iron-carbon microelectrolysis reaction device in accordance with the present invention.
Compared with the prior art, the invention has the following beneficial effects:
1. the iron-carbon micro-electrolysis reaction device adopts the lateral flowing water inlet and the ultrasonic generator and arranges the iron-carbon fillers according to different particle sizes in a layered way, thereby not only greatly improving the reaction efficiency, the utilization rate of iron-carbon materials and the reduction efficiency of iron-carbon micro-electrolysis on wastewater, but also solving the problems of iron-carbon filler blockage, hardening, passivation and the like existing in the existing iron-carbon micro-electrolysis technology and device, and having good application prospect.
2. The reaction device disclosed by the invention is simple in structure and easy to operate, the filler is simple to activate and regenerate, the later-stage sludge is convenient to clean, the system investment cost is reduced, the operation cost is low, the device is suitable for large-scale popularization and application, a new thought is provided for efficiently catalyzing the iron-carbon micro-electrolysis reaction, and good economic benefits are achieved.
Detailed Description
The present invention will be described in further detail with reference to examples.
In the specific implementation: as shown in figure 1, the reaction device for iron-carbon micro-electrolysis comprises a reaction chamber 1 and an aeration chamber 2 positioned below the reaction chamber, the reaction chamber 1 is separated from the aeration chamber 2 by a screen, the reaction chamber 1 is divided into a plurality of multi-stage filling chambers by a plurality of screens with different mesh numbers, and the multi-stage filling chambers are respectively a first filling chamber 3, a second filling chamber 4, a third filling chamber 5 and a fourth filling chamber 6 from bottom to top, the multistage filling chamber is internally provided with iron-carbon filling, the bottom of the aeration chamber 2 is provided with a plurality of aeration ports 7, the side walls of the multistage filling chamber are provided with backflow water inlets 8, the backflow water inlets 8 are connected with the water outlet of the backflow pump through backflow pipelines, a water inlet of the reflux pump is connected with a water outlet arranged on the material supplementing pool 9, and a water outlet 10 arranged above the fourth filling chamber is connected with a water inlet arranged on the material supplementing pool through a pipeline; and ultrasonic generators 11 are arranged on the side walls of the multistage packing chambers.
Adopt above-mentioned structure, arrange the iron carbon filler according to different particle diameter layering, can effectively reduce the mixture of iron carbon material, adopt the side direction to flow into water and can realize the washing away to iron carbon material, through side direction water pressure and flow size control intensity of washout, and then in time wash away the reaction residual error on surface and filter sedimentary suspended solid for iron (carbonaceous) filler surface keeps high activity constantly, thereby great improvement reaction efficiency and iron carbon material's utilization ratio and the reduction efficiency of iron carbon microelectrolysis to waste water. And the lateral flow stripping can keep the iron and carbon in a fluffy suspension state, reduce the possibility of agglomeration due to the action of gravity, and avoid channeling (the wastewater passes through the filler from the plate gaps). The ultrasonic generator arranged on the side wall can fully disperse the iron-carbon filler, so that not only can the hardening of the filler be avoided, but also the pollutant decomposition reaction can be rapidly and fully carried out.
During implementation, the iron-carbon filler is an iron-carbon mixed filler or an iron-carbon composite filler, and the molar ratio of iron elements to carbon elements in the iron-carbon filler is 1-10: 1 to 5. Because the iron-carbon ratio directly influences the treatment effect of the micro-electrolysis reaction, when the iron-carbon ratio is too high, the residual iron reacts with acidity, the pH value is increased, and the reaction is influenced; too little iron will result in a deficiency of the primary iron-carbon cell and a slowing effect.
When the device is used, a screen mesh between the first filling chamber and the second filling chamber is 20-60 meshes; a screen mesh between the second filling chamber and the third filling chamber is 60-100 meshes; the screen mesh between the third filling chamber and the fourth filling chamber is 100-300 meshes, and the screen mesh between the reaction chamber and the aeration chamber is 20-300 meshes. By adopting the structure, the fillers in different filler chambers are distributed according to different particle sizes, and the treatment efficiency of pollutants is improved.
In the implementation process, the particle size of the iron carbon filler in the first filler chamber is 5-20 meshes, the particle size of the iron carbon filler in the second filler chamber is 20-60 meshes, the particle size of the iron carbon filler in the third filler chamber is 60-100 meshes, and the particle size of the iron carbon filler in the fourth filler chamber is 100-200 meshes. Like this, with the iron-carbon material according to different particle diameter layering, make the pollutant reaction of grading, strengthened the adaptability of reactor to different load waste water, most of useless mud will concentrate on the fourth layer that the filler particle diameter is minimum simultaneously, great specific surface area has increased the area of contact with the pending waste water, has improved the treatment effeciency, and this also has reduced the useless mud clearance degree of difficulty in later stage to a certain extent.
In the implementation process, the filling rate of the iron-carbon filler in the multistage filler chamber is 40-80%, and the height ratio of the first filler chamber to the second filler chamber to the third filler chamber to the fourth filler chamber is preferably set to be 1:1:1: 2. The lower filling rate can ensure that the reaction of the filler is more uniform, and the reaction speed can be accelerated to a certain extent, but the treatment effect is poor due to too low filling rate, so the filling rate is controlled to be about 60%. The fourth packing chamber takes over the majority of the purification in the reactor and the amount of sludge is greatest, so this layer is preferably twice as high as the other packing chambers.
In the implementation process, an outlet screen is further arranged at the water outlet on the fourth filling chamber, the outlet screen is 200 meshes, and by adopting the structure, when the passivation layers of the small filler powder and the filler are washed by the lateral flow and need to be removed in time, the aperture of the outlet screen can be adjusted to be larger; when the interception is needed to reduce the loss rate of the filler, the aperture of the outlet screen can be adjusted to be smaller.
When the method is implemented, the reflux ratio of the reaction device is 1-10: 1; the backflow water flow ratio of the first filling chamber, the second filling chamber, the third filling chamber and the fourth filling chamber is 1-10: 1-10: 1-10: 1 to 10.
During implementation, the material supplementing pool further comprises an iron-carbon filler, the particle size of the iron-carbon filler is 100-200 meshes, and the molar ratio of iron elements to carbon elements is 1-10: 1 to 5.
When in implementation, a rotatable stirring shaft 12 is vertically arranged in the aeration chamber, and stirring blades 13 for stirring are radially arranged on the stirring shaft; the dissolved air aeration rate in the aeration chamber is 1-5 m 3 /（min.m 3 ) And the content of dissolved oxygen in the multistage packing chamber is 10-20 mg/L.
By adopting the structure, the dissolved oxygen in water is greatly improved, the oxidation-reduction reaction is enhanced, and the iron-carbon micro-electrolysis reaction efficiency and the sewage treatment effect are improved.
In the implementation process, the power of the ultrasonic generator is 0.2-5 KW, preferably, the ultrasonic power of the first filling chamber and the ultrasonic power of the second filling chamber are controlled to be 0.3-0.5 KW, and the ultrasonic power of the third filling chamber and the ultrasonic power of the fourth filling chamber are controlled to be 0.1-0.3 KW. Therefore, the iron-carbon filler is fully dispersed according to the particle size of the iron-carbon filler, fully contacts with wastewater, and simultaneously avoids filler hardening.
When the method is implemented, the hydraulic retention time in the reaction device is 2-6 h.
During implementation, the screen is made of stainless steel, so that the stability of the filler is ensured.
When in use, the dissolved air aeration device is made of stainless steel or is provided with plastic lining protection measures to prevent the dissolved air aeration device from being corroded. In addition, other parts contacting with the reaction liquid need to be made of stainless steel or provided with plastic lining protection measures
In the specific implementation, during detection: in the following examples, all the devices in contact with the reaction solution are made of stainless steel or are provided with plastic lining protection measures. The hydraulic retention time of the reaction device is controlled to be 4 h.
Example 1
A reaction device for iron-carbon micro-electrolysis comprises a reaction chamber 1 and an aeration chamber 2 located below the reaction chamber, wherein the reaction chamber is separated from the aeration chamber through a screen, the reaction chamber is divided into a plurality of screen meshes with different mesh numbers to form a multi-stage filling chamber, the multi-stage filling chamber is sequentially provided with a first filling chamber 3, a second filling chamber 4, a third filling chamber 5 and a fourth filling chamber 6 from bottom to top, iron-carbon filling is arranged in the multi-stage filling chamber, a plurality of aeration ports 7 are arranged at the bottom of the aeration chamber 2, the side walls of the multi-stage filling chamber are respectively provided with a backflow water inlet 8, the backflow water inlet is connected with a water outlet of a backflow pump through a backflow channel, a water inlet of the backflow pump is connected with a water outlet arranged on a material supplementing tank 9, and a water outlet 10 arranged above the fourth filling chamber is connected with a water inlet arranged on the material supplementing tank through a pipeline; and the side wall of the multistage packing chamber is also provided with an ultrasonic generator 11.
The screen mesh between the first filling chamber and the second filling chamber is 20 meshes; the screen mesh between the second filling chamber and the third filling chamber is 60 meshes; the screen mesh between the third filling chamber and the fourth filling chamber is 100 meshes, and the screen mesh between the reaction chamber and the aeration chamber is 20 meshes; the iron-carbon filler is selected from iron and carbon mixed fillers, and the molar ratio of iron elements to carbon elements in the iron and carbon mixed fillers is 3: 1. the grain diameter of the first packing chamber filler is 10 meshes, the grain diameter of the second packing chamber filler is 30 meshes, the grain diameter of the third packing chamber filler is 70 meshes, the grain diameter of the fourth packing chamber filler is 100 meshes, the filling rate of each layer is 60%, and the height ratio of the first packing chamber to the second packing chamber to the third packing chamber to the fourth packing chamber is 1:1:1: 2.
Wherein the aeration amount in the aeration chamber is controlled to be 3m 3 /（min.m 3 ) The content of dissolved oxygen in the reaction chamber was controlled to 15 mg/L.
Wherein, iron element and carbon element are added into the feed supplement pool, the molar ratio of iron to carbon is controlled to be 1: 5, the particle size is preferably controlled to be 100 meshes. The reflux ratio of the reaction device is controlled to be 4: 1, the backflow water quantity ratio entering from a backflow water inlet in the first filling chamber, the second filling chamber, the third filling chamber and the fourth filling chamber is 2: 1:1: 0.5.
the power of the ultrasonic generators of the first packing chamber and the second packing chamber is set to be 0.5kw, and the power of the ultrasonic generators of the third packing chamber and the fourth packing chamber is set to be 0.3 kw.
Example 2
A reaction device for iron-carbon micro-electrolysis comprises a reaction chamber 1 and an aeration chamber 2 located below the reaction chamber, wherein the reaction chamber is separated from the aeration chamber through a screen, the reaction chamber is divided into a plurality of screen meshes with different mesh numbers to form a multi-stage filling chamber, the multi-stage filling chamber is sequentially provided with a first filling chamber 3, a second filling chamber 4, a third filling chamber 5 and a fourth filling chamber 6 from bottom to top, iron-carbon fillers are arranged in the multi-stage filling chamber, a plurality of aeration ports 7 are arranged at the bottom of the aeration chamber 2, a backflow water inlet 8 is arranged on the side wall of the multi-stage filling chamber, the backflow water inlet is connected with a water outlet of a backflow pump through a backflow channel, a water inlet of the backflow pump is connected with a water outlet arranged on a material supplementing tank 9, and a water outlet 10 arranged above the fourth filling chamber is connected with a water inlet arranged on the material supplementing tank through a pipeline; and the side wall of the multistage packing chamber is also provided with an ultrasonic generator 11.
The screen mesh between the first filling chamber and the second filling chamber is 20 meshes; the screen mesh between the second filling chamber and the third filling chamber is 60 meshes; the screen mesh between the third filling chamber and the fourth filling chamber is 100 meshes, and the screen mesh between the reaction chamber and the aeration chamber is 20 meshes; the iron-carbon filler is selected from iron and carbon mixed fillers, and the molar ratio of iron elements to carbon elements in the iron and carbon mixed fillers is 2: 1. the grain diameter of the first packing chamber filler is 5 meshes, the grain diameter of the second packing chamber filler is 25 meshes, the grain diameter of the third packing chamber filler is 80 meshes, the grain diameter of the fourth packing chamber filler is 150 meshes, the filling rate of each layer is 60%, and the height ratio of the first packing chamber to the second packing chamber to the third packing chamber to the fourth packing chamber is 1:1:1: 2.
Wherein the aeration amount in the aeration chamber is controlled to be 5m 3 /（min.m 3 ) The content of dissolved oxygen in the reaction chamber was controlled to 20 mg/L.
Wherein, add iron element and carbon element in the feed supplement pond, the iron-carbon molar ratio control is at 1:1, the particle size is preferably controlled to 150 mesh. The reflux ratio of the reaction device is controlled to be 4: 1, the backflow water quantity ratio entering from a backflow water inlet in the first filling chamber, the second filling chamber, the third filling chamber and the fourth filling chamber is 3: 1:1: 1.
the power of the ultrasonic generators of the first packing chamber and the second packing chamber is set to be 0.4kw, and the power of the ultrasonic generators of the third packing chamber and the fourth packing chamber is set to be 0.2 kw.
Example 3
A reaction device for iron-carbon micro-electrolysis comprises a reaction chamber 1 and an aeration chamber 2 positioned below the reaction chamber, wherein the reaction chamber is separated from the aeration chamber through a screen, the reaction chamber is divided into a plurality of screen meshes with different meshes to form a multi-stage packing chamber, the multi-stage packing chamber comprises a first packing chamber 3, a second packing chamber 4, a third packing chamber 5 and a fourth packing chamber 6 from bottom to top, iron-carbon packing is arranged in the multi-stage packing chamber, a plurality of aeration ports 7 are arranged at the bottom of the aeration chamber 2, a backflow water inlet 8 is formed in the side wall of each multi-stage packing chamber, the backflow water inlet is connected with a water outlet of a backflow pump through a backflow channel, a water inlet of the backflow pump is connected with a water outlet formed in a material supplementing tank 9, and a water outlet 10 formed above the fourth packing chamber is connected with a water inlet formed in the material supplementing tank through a pipeline; and the side wall of the multistage packing chamber is also provided with an ultrasonic generator 11.
The screen mesh between the first filling chamber and the second filling chamber is 20 meshes; the screen mesh between the second filling chamber and the third filling chamber is 60 meshes; the screen mesh between the third filling chamber and the fourth filling chamber is 100 meshes, and the screen mesh between the reaction chamber and the aeration chamber is 20 meshes; the iron-carbon filler is selected from iron and carbon mixed fillers, and the molar ratio of iron elements to carbon elements in the iron-carbon mixed fillers is 3: 1. the grain size of the filler in the first filler chamber is 10 meshes, the grain size of the filler in the second filler chamber is 30 meshes, the grain size of the filler in the third filler chamber is 80 meshes, the grain size of the filler in the fourth filler chamber is 150 meshes, the filling rate of each layer is 70%, and the height ratio of the first filler chamber to the second filler chamber to the third filler chamber to the fourth filler chamber is 1:1:1: 2.
Wherein the aeration amount in the aeration chamber is controlled to be 3m 3 /（min.m 3 ) The content of dissolved oxygen in the reaction chamber was controlled to 10 mg/L.
Wherein, add iron element and carbon element in the feed supplement pond, the iron-carbon molar ratio control is at 1:2, the particle size is preferably controlled to 100 mesh. The reflux ratio of the reaction device is controlled to be 3: 1, the backflow water quantity ratio entering from a backflow water inlet in the first filling chamber, the second filling chamber, the third filling chamber and the fourth filling chamber is 3: 1:1: 0.5.
the power of the ultrasonic generators of the first packing chamber and the second packing chamber is set to be 0.5kw, and the power of the ultrasonic generators of the third packing chamber and the fourth packing chamber is set to be 0.3 kw.
Example 4
A reaction device for iron-carbon micro-electrolysis comprises a reaction chamber 1 and an aeration chamber 2 located below the reaction chamber, wherein the reaction chamber is separated from the aeration chamber through a screen, the reaction chamber is divided into a plurality of screen meshes with different meshes to form a multi-stage filling chamber, the multi-stage filling chamber is sequentially provided with a first filling chamber 3, a second filling chamber 4, a third filling chamber 5 and a fourth filling chamber 6 from bottom to top, iron-carbon filling is arranged in the multi-stage filling chamber, a plurality of aeration ports 7 are arranged at the bottom of the aeration chamber 2, the side wall of each stage of filling chamber is provided with a backflow water inlet 8, the backflow water inlet is connected with a water outlet of a backflow pump through a backflow channel, a water inlet of the backflow pump is connected with a water outlet arranged on a material supplementing tank 9, and a water outlet 10 arranged above the fourth filling chamber is connected with a water inlet arranged on the material supplementing tank through a pipeline; and the side wall of the multistage packing chamber is also provided with an ultrasonic generator 11.
The screen mesh between the first filling chamber and the second filling chamber is 20 meshes; the screen mesh between the second filling chamber and the third filling chamber is 60 meshes; the screen mesh between the third filling chamber and the fourth filling chamber is 100 meshes, and the screen mesh between the reaction chamber and the aeration chamber is 20 meshes; the iron-carbon filler is selected from iron and carbon mixed fillers, and the molar ratio of iron elements to carbon elements in the iron-carbon mixed fillers is 3: 5. the grain diameter of the first packing chamber filler is 10 meshes, the grain diameter of the second packing chamber filler is 30 meshes, the grain diameter of the third packing chamber filler is 70 meshes, the grain diameter of the fourth packing chamber filler is 100 meshes, the filling rate of each layer is 80%, and the height ratio of the first packing chamber to the second packing chamber to the third packing chamber to the fourth packing chamber is 1:1:1: 2.
Wherein the aeration amount in the aeration chamber is controlled to be 3m 3 /（min.m 3 ) The content of dissolved oxygen in the reaction chamber was controlled to 15 mg/L.
Wherein, iron element and carbon element are added into the feed supplement pool, the molar ratio of iron to carbon is controlled to be 1:1, the particle size is preferably controlled to 150 mesh. The reflux ratio of the reaction device is controlled to be 3: 1, the backflow water quantity ratio entering from a backflow water inlet in the first filling chamber, the second filling chamber, the third filling chamber and the fourth filling chamber is 2: 2: 1: 1.
the power of the ultrasonic generators of the first packing chamber and the second packing chamber is set to be 0.5kw, and the power of the ultrasonic generators of the third packing chamber and the fourth packing chamber is set to be 0.3 kw.
Example 5
A reaction device for iron-carbon micro-electrolysis comprises a reaction chamber 1 and an aeration chamber 2 located below the reaction chamber, wherein the reaction chamber is separated from the aeration chamber through a screen, the reaction chamber is divided into a plurality of screen meshes with different mesh numbers to form a multi-stage filling chamber, the multi-stage filling chamber is sequentially provided with a first filling chamber 3, a second filling chamber 4, a third filling chamber 5 and a fourth filling chamber 6 from bottom to top, iron-carbon filling is arranged in the multi-stage filling chamber, a plurality of aeration ports 7 are arranged at the bottom of the aeration chamber 2, the side walls of the multi-stage filling chamber are respectively provided with a backflow water inlet 8, the backflow water inlet is connected with a water outlet of a backflow pump through a backflow pipeline, a water inlet of the backflow pump is connected with a water outlet arranged on a material supplementing tank 9, and a water outlet 10 arranged above the fourth filling chamber is connected with a water inlet arranged on the material supplementing tank through a pipeline; and the side wall of the multistage packing chamber is also provided with an ultrasonic generator 11.
The screen mesh between the first filling chamber and the second filling chamber is 20 meshes; the screen mesh between the second filling chamber and the third filling chamber is 60 meshes; the screen mesh between the third filling chamber and the fourth filling chamber is 100 meshes, and the screen mesh between the reaction chamber and the aeration chamber is 20 meshes; the iron-carbon filler is selected from iron and carbon mixed fillers, and the molar ratio of iron elements to carbon elements in the iron-carbon mixed fillers is 10: 1. the grain diameter of the filler in the first filler chamber is 10 meshes, the grain diameter of the filler in the second filler chamber is 50 meshes, the grain diameter of the filler in the third filler chamber is 70 meshes, the grain diameter of the filler in the fourth filler chamber is 150 meshes, the filling rate of each layer is 60%, and the height ratio of the first filler chamber to the second filler chamber to the third filler chamber to the fourth filler chamber is 1:1:1: 2.
Wherein the aeration rate in the aeration chamber is controlled at 5m 3 /（min.m 3 ) The content of dissolved oxygen in the reaction chamber was controlled to 20 mg/L.
Wherein, add iron element and carbon element in the feed supplement pond, the iron-carbon molar ratio control is at 2: 1, the particle size is preferably controlled to 150 mesh. The reflux ratio of the reaction device is controlled to be 2: 1, the backflow water quantity ratio entering from a backflow water inlet in the first filling chamber, the second filling chamber, the third filling chamber and the fourth filling chamber is 2: 1:1: 0.5.
the power of the ultrasonic generators of the first packing chamber and the second packing chamber is set to be 0.5kw, and the power of the ultrasonic generators of the third packing chamber and the fourth packing chamber is set to be 0.3 kw.
Example 6
A reaction device for iron-carbon micro-electrolysis comprises a reaction chamber 1 and an aeration chamber 2 located below the reaction chamber, wherein the reaction chamber is separated from the aeration chamber through a screen, the reaction chamber is divided into a plurality of screen meshes with different mesh numbers to form a multi-stage filling chamber, the multi-stage filling chamber is sequentially provided with a first filling chamber 3, a second filling chamber 4, a third filling chamber 5 and a fourth filling chamber 6 from bottom to top, iron-carbon filling is arranged in the multi-stage filling chamber, a plurality of aeration ports 7 are arranged at the bottom of the aeration chamber 2, the side walls of the multi-stage filling chamber are respectively provided with a backflow water inlet 8, the backflow water inlet is connected with a water outlet of a backflow pump through a backflow pipeline, a water inlet of the backflow pump is connected with a water outlet arranged on a material supplementing tank 9, and a water outlet 10 arranged above the fourth filling chamber is connected with a water inlet arranged on the material supplementing tank through a pipeline; and the side wall of the multistage packing chamber is also provided with an ultrasonic generator 11.
The screen mesh between the first filling chamber and the second filling chamber is 20 meshes; the screen mesh between the second filling chamber and the third filling chamber is 60 meshes; the screen mesh between the third filling chamber and the fourth filling chamber is 100 meshes, and the screen mesh between the reaction chamber and the aeration chamber is 20 meshes; the iron-carbon filler is selected from iron and carbon mixed fillers, and the molar ratio of iron elements to carbon elements in the iron-carbon mixed fillers is 3: 1. the grain diameter of the first packing chamber filler is 14 meshes, the grain diameter of the second packing chamber filler is 35 meshes, the grain diameter of the third packing chamber filler is 70 meshes, the grain diameter of the fourth packing chamber filler is 150 meshes, the filling rate of each layer is 60%, and the height ratio of the first packing chamber to the second packing chamber to the third packing chamber to the fourth packing chamber is 1:1:1: 2.
Wherein the aeration rate in the aeration chamber is controlled at 5m 3 /（min.m 3 ) The content of dissolved oxygen in the reaction chamber was controlled to 20 mg/L.
Wherein, add iron element and carbon element in the feed supplement pond, the iron-carbon ratio control is at 2: 1, the particle size is preferably controlled to 150 mesh. The reflux ratio of the reaction device is controlled to be 4: 1, the backflow water quantity ratio entering from a backflow water inlet in the first filling chamber, the second filling chamber, the third filling chamber and the fourth filling chamber is 4: 3: 2: 1.
the power of the ultrasonic generators of the first packing chamber and the second packing chamber is set to be 0.5kw, and the power of the ultrasonic generators of the third packing chamber and the fourth packing chamber is set to be 0.2 kw.
The reactor of the embodiment 1-6 is used for the test of actual wastewater, the iron-carbon micro-electrolysis reaction device is started to perform iron-carbon micro-electrolysis reaction, effluent is obtained after 2 hours of treatment, then the effluent is detected, the removal rate of wastewater pollutants is obtained, and the result is shown in table 1. The COD of the original wastewater is 1239mg/L, the ammonia nitrogen is 456mg/L, and the total nitrogen is 501 mg/L.
TABLE 1
| Product(s) | Removal rate of COD (%) | Removal ratio of Ammonia Nitrogen (%) | Removal ratio of Total Nitrogen (%) | COD removal Rate after 1 year of use (%) |
| Example 1 | 67.3 | 65.8 | 66.9 | 66.3 |
| Example 2 | 70.5 | 71.8 | 67.3 | 59.2 |
| Example 3 | 75.7 | 71.3 | 69.6 | 75.1 |
| Example 4 | 69.8 | 65.7 | 68.5 | 69.3 |
| Example 5 | 71.2 | 67.5 | 69.2 | 71.1 |
| Example 6 | 74.1 | 71.2 | 70.9 | 74.0 |
| Conventional microelectrolysis reactor 1 | 62.5 | 58.3 | 61.7 | 32 |
| |
58.9 | 53.8 | 59.2 | 28 |
As can be seen from Table 1, compared with the conventional micro-electrolysis reactor (conventional commercial product), the invention has higher removal efficiency of COD, ammonia nitrogen and total nitrogen, can obviously improve the treatment effect on organic wastewater, has little change of COD removal efficiency after continuous use for one year, has no problems of filler blockage, hardening, passivation and the like, has high utilization rate of the filler and is not easy to lose. And after the conventional micro-electrolysis reactor product is used for a long time, the COD removal rate is obviously reduced, because the iron-carbon filler of the reactor is hardened, the reaction activity of the iron-carbon material is reduced, and further the COD removal efficiency is reduced.
The above description is only exemplary of the present invention and should not be taken as limiting, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A reaction device for iron-carbon micro-electrolysis is characterized by comprising a reaction chamber (1) and an aeration chamber (2) positioned below the reaction chamber, the reaction chamber is separated from the aeration chamber by a screen, the reaction chamber is divided into a plurality of multi-stage filling chambers by a plurality of screens with different meshes, and the multi-stage filling chambers are respectively a first filling chamber (3), a second filling chamber (4), a third filling chamber (5) and a fourth filling chamber (6) from bottom to top, iron-carbon filler is arranged in the multistage filler chamber, a plurality of aeration openings (7) are arranged at the bottom of the aeration chamber (2), the side walls of the multistage packing chambers are respectively provided with a backflow water inlet (8), the backflow water inlets are connected with the water outlet of the backflow pump through backflow channels, a water inlet of the reflux pump is connected with a water outlet arranged on the material supplementing pool (9), and a water outlet (10) arranged above the fourth filling chamber is connected with a water inlet arranged on the material supplementing pool through a pipeline; the side wall of the multistage packing chamber is also provided with an ultrasonic generator (11);
the screen mesh between the first filling chamber and the second filling chamber is 20 meshes; the screen mesh between the second filling chamber and the third filling chamber is 60 meshes; the screen mesh between the third filling chamber and the fourth filling chamber is 100 meshes, and the screen mesh between the reaction chamber and the aeration chamber is 20 meshes; the iron-carbon filler is selected from iron and carbon mixed fillers, and the molar ratio of iron elements to carbon elements in the iron-carbon mixed fillers is 3: 1; the particle size of the filler in the first filler chamber is 10 meshes, the particle size of the filler in the second filler chamber is 30 meshes, the particle size of the filler in the third filler chamber is 80 meshes, the particle size of the filler in the fourth filler chamber is 150 meshes, the filling rate of each layer is 70%, and the height ratio of the first filler chamber to the second filler chamber to the third filler chamber to the fourth filler chamber is 1:1:1: 2;
wherein the aeration amount in the aeration chamber is controlled to be 3m 3 /（min.m 3 ) The content of dissolved oxygen in the reaction chamber is controlled to be 10 mg/L; wherein, iron element and carbon element are added into the feed supplement pool, the molar ratio of iron to carbon is controlled to be 1:2, the particle size is preferably controlled to be 100 meshes; the reflux ratio of the reaction device is controlled to be 3: 1, the backflow water quantity ratio entering from a backflow water inlet in the first filling chamber, the second filling chamber, the third filling chamber and the fourth filling chamber is 3: 1:1: 0.5;
the power of the ultrasonic generators of the first packing chamber and the second packing chamber is set to be 0.5kw, and the power of the ultrasonic generators of the third packing chamber and the fourth packing chamber is set to be 0.3 kw.
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