Fluidized bed iron-carbon micro-electrolysis reactor with enhanced denitrification function

Abstract

The utility model provides a fluidized bed iron-carbon micro-electrolysis reactor with an enhanced denitrification function, which belongs to the technical field of sewage treatment and comprises a reaction tower body, a water inlet header pipe and an air lifter, the reaction tower body comprises a bearing plate, and a crystal discharge header pipe is arranged at the bottom of the iron-carbon composite fluidized filler and penetrates through the reaction tower body. The iron-carbon micro-electrolysis reactor disclosed by the utility model has the beneficial effects that the iron-carbon composite fluidizing filler arranged in the reaction tower body of the reactor can be in a fluidizing state under the action of lifting water flow of the air lifter, so that the mass transfer exchange rate is improved, and the time required by iron-carbon micro-electrolysis reaction is greatly reduced, thereby reducing the volume and construction cost of the reactor and improving the production efficiency. Meanwhile, the filler particles are always in an irregular motion state in a fluidized state, so that the problem of hardening of the filler particles in the reactor is avoided; the iron-carbon composite fluidized filler comprises sodium chloride modified zeolite filler particles, and the sewage treatment efficiency of the reactor can be greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a fluidized bed iron-carbon micro-electrolysis reactor with enhanced denitrification function. Background Technology

[0002] Iron-carbon micro-electrolysis is generally used in conjunction with Fenton oxidation and coagulation sedimentation processes. It has good treatment effects on recalcitrant organic wastewater and heavy metal wastewater, and is widely used in wastewater treatment in industries such as pharmaceuticals, printing and dyeing, chemical fibers, and leather tanning. The iron-carbon micro-electrolysis method has the following advantages in wastewater treatment: 1) The process is simple to operate and has low treatment costs; 2) It has good treatment effects on recalcitrant wastewater, effectively reducing its toxicity and improving its biodegradability; 3) It has good removal effects on organic matter, phosphorus, and heavy metal pollutants. However, traditional micro-electrolysis technology also exhibits some significant shortcomings in treating industrial wastewater, mainly manifested in the following ways: 1) Traditional iron-carbon micro-electrolysis towers are generally packed fixed-bed reactors, resulting in insufficient mixing and mass transfer, and low reaction efficiency. The hydraulic retention time of the reactor generally requires more than 2 hours; 2) The iron-carbon micro-electrolysis packing in traditional iron-carbon micro-electrolysis towers is prone to caking and passivation. When such problems occur, the reactor's treatment efficiency decreases or even fails, and regeneration or cleaning is time-consuming and labor-intensive; 3) The iron-carbon packing in traditional iron-carbon micro-electrolysis towers accumulates at the bottom of the reactor. To avoid caking, in addition to the air required for the oxidation-reduction reaction, a large amount of extra air is needed to flush the packing, resulting in high energy consumption. The aeration rate of traditional iron-carbon micro-electrolysis towers is generally 5 m³ / h. 3 air / m 3 Wastewater; 4) Traditional iron-carbon micro-electrolysis reactors have good removal effects on organic matter, phosphorus and heavy metal pollutants, but nitrogen pollutants are also one of the main pollutants in wastewater. Traditional iron-carbon micro-electrolysis reactors have very poor removal effects on nitrogen pollutants, and the nitrogen removal rate is generally less than 10%. Utility Model Content

[0003] In view of this, the present invention provides a fluidized bed iron-carbon micro-electrolysis reactor with enhanced denitrification function, including a reaction tower body, a main water inlet pipe and an air lifter;

[0004] The reaction tower body includes a support plate with multiple water permeable holes and multiple water distributors at the bottom of the support plate. All water distributors are connected to the lower end of the main water inlet pipe.

[0005] The support plate is filled with iron-carbon composite fluidized packing, and the bottom of the iron-carbon composite fluidized packing is provided with a crystal discharge manifold, which passes through the reaction tower body;

[0006] The iron-carbon composite fluidized filler is provided with a lateral flow elbow above it, and a water collecting main above the lateral flow elbow, one end of the water collecting main extending out of the reaction tower body, and the other end connected with an air lifter, the air lifter being connected with the upper end of the water inlet main pipe; the air inlet of the air lifter being connected with a blower; and the upper end of the water inlet main pipe being further provided with a water inlet.

[0007] Further, the iron-carbon composite fluidized filler comprises iron-carbon particle balls and sodium chloride modified zeolite particle balls.

[0008] Further, the lateral flow elbow comprises a plurality of flow elbow pipes which are arranged in a slanting manner relative to the vertical direction, all the flow elbow pipes being arranged in parallel, and the side walls of adjacent flow elbow pipes being fixedly connected.

[0009] Further, the top side wall of the reaction tower body is further provided with an air lifting groove, the air lifting groove being connected to the top of the water inlet main pipe, the air lifting groove being connected with the water collecting main, and the air lifter being arranged in the air lifting groove.

[0010] Further, a partition plate is arranged in the air lifting groove, the partition plate dividing the cavity in the air lifting groove into a water storage cavity and a reflux cavity, the water collecting main being communicated with the water storage cavity, the air lifter being arranged in the water storage cavity, and a reflux hole being arranged on the partition plate.

[0011] Further, an adjustable weir gate is further arranged on the reflux hole.

[0012] Further, the particle size of the iron-carbon composite fluidized filler is 0.5-0.6mm.

[0013] Further, the lower end of the water inlet main pipe extends through the reaction tower body into the reaction tower body, a plurality of water distribution branch pipes are connected to the upper end of the water inlet main pipe, and the water distributor is connected to the end of the water distribution branch pipe.

[0014] Further, a plurality of water collecting channels are further arranged above the lateral flow elbow, all the water collecting channels being connected with the water collecting main.

[0015] Further, a plurality of crystal discharge branch pipes are vertically connected to the crystal discharge main pipe, the crystal discharge branch pipes and the crystal discharge main pipe being provided with crystal discharge holes, one end of the crystal discharge main pipe being provided with a crystal discharge port, the crystal discharge port extending through the reaction tower body, and a crystal discharge valve being further arranged on the crystal discharge port.

[0016] The iron-carbon micro-electrolysis reactor with enhanced nitrogen removal function has the following advantages:

[0017] 1、the reactor's reaction tower body is equipped with iron-carbon composite fluidized filler, and the air lift can promote the water body to flow upward, pass through the iron-carbon composite fluidized filler, and make it in a fluidized state; the filler particles are always in a random motion state in the fluidized state, completely avoiding the problems of filler hardening, passivation and even deactivation that may occur in the fixed bed filler of the traditional iron-carbon micro-electrolysis reactor.

[0018] 2、the mass transfer exchange rate and reaction rate of the iron-carbon composite fluidized filler in the fluidized state of the reactor's reaction tower body are greatly increased, the time required for the iron-carbon micro-electrolysis reaction can be greatly reduced, the hydraulic retention time of the fluidized bed iron-carbon micro-electrolysis tower is only 37.5% of that of the traditional iron-carbon micro-electrolysis reactor, and therefore the volume of the reactor is only 37.5% of that of the traditional iron-carbon micro-electrolysis reactor, greatly reducing the construction cost of the reactor.

[0019] 3、the iron-carbon composite fluidized filler is added with sodium chloride modified zeolite filler particles; the adsorption of ammonia nitrogen by the sodium chloride modified zeolite filler particles can reach more than 80%, and therefore the nitrogen pollutant removal efficiency of the fluidized bed iron-carbon micro-electrolysis tower is increased by 70% compared with that of the traditional iron-carbon micro-electrolysis reactor.

[0020] 4、the air consumption of the reactor is 3m 3 air / m 3 wastewater, the air consumption is only 60% of that of the traditional iron-carbon micro-electrolysis tower, and the air pressure is only 30% of that of the traditional iron-carbon micro-electrolysis tower, and therefore the energy consumption required for aeration is reduced by 82%.

[0021] 5、the iron-carbon composite fluidized filler of the reactor does not have the problems of hardening, clogging, passivation and failure, and therefore it is not necessary to regenerate or clean the filler, reducing the consumption of manpower and resources; the fluidized bed iron-carbon micro-electrolysis tower only needs to supplement the filler and discharge the bottom crystals periodically, and the operation is simple. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a cross-sectional view of the whole structure of the fluidized bed iron-carbon micro-electrolysis reactor with enhanced denitrification function according to an embodiment of the present utility model.

[0023] Figure 2 is a connection structure diagram of the water inlet main pipe and the water distributor of the fluidized bed iron-carbon micro-electrolysis reactor with enhanced denitrification function according to an embodiment of the present utility model.

[0024] Figure 3 is a connection structure diagram of the crystal discharge branch pipe and the crystal discharge main pipe of the fluidized bed iron-carbon micro-electrolysis reactor with enhanced denitrification function according to an embodiment of the present utility model.

[0025] Figure 4It is a connection structure schematic view of water collecting main canal and air lifting groove of the fluidized bed iron-carbon micro-electrolysis reactor with strengthened denitrogenation function.

[0026] Figure 5 It is Figure 4 The internal structure schematic view of the hollow air lifting groove.

[0027] In the above figure: 1-reaction tower body, 2-water inlet main pipe, 3-water distribution branch pipe, 4-water distributor, 5-crystal discharge main pipe, 6-crystal discharge branch pipe, 7-crystal discharge port, 8-supporting plate, 9-lateral flow deflector, 10-water collecting channel, 11-water collecting main canal, 12-water collecting groove, 13-air lifting groove, 14-air inlet, 15-air lifter, 16-backflow cavity, 17-adjustable weir gate, 18-water inlet, 19-water outlet, 20-iron-carbon composite fluidized filler, 21-crystalline body. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model embodiments will be further described below with reference to the drawings.

[0029] Please refer to Figures 1 to 5 The utility model provides a kind of fluidized bed iron-carbon micro-electrolysis reactor with strengthened denitrogenation function, including reaction tower body 1, water inlet main pipe 2 and air lifter 15;

[0030] The reaction tower body 1 includes supporting plate 8, and the supporting plate 8 is provided with a plurality of water-permeable holes, and the bottom of the supporting plate 8 is provided with a plurality of water distributors 4, and all the water distributors 4 are connected to the lower end of the water inlet main pipe 2.

[0031] The supporting plate 8 is stacked with iron-carbon composite fluidized filler 20, and the bottom of the iron-carbon composite fluidized filler 20 is provided with crystal discharge main pipe 5, and the crystal discharge main pipe 5 penetrates through the reaction tower body 1.

[0032] The iron-carbon composite fluidized filler 20 is provided with a lateral flow deflector 9 above, and the lateral flow deflector 9 is provided with a water collecting main canal 11 above, and the water collecting main canal 11 extends out of the reaction tower body 1 at one end, and the other end is connected to the air lifter, and the end of the water collecting main canal 11 extending out of the reaction tower body 1 is the water outlet 19, and the air lifter 15 is connected to the upper end of the water inlet main pipe 2; the air inlet 14 of the air lifter 15 is connected to the air blower; the upper end of the water inlet main pipe 2 is also provided with a water inlet 18.

[0033] The water inlet main pipe 2 is used to input the sewage to be treated from the water distributor 4 into the reaction tower body 1, and the sewage is reacted with the iron-carbon composite fluidized filler 20 in the reaction tower body 1 to produce the crystalline body 21. The lateral flow spout 9 is used to guide the produced crystalline body to flow downward to be deposited on the supporting plate 8. The crystalline body discharge main pipe 5 is used to discharge the crystalline body 21 on the supporting plate 8. The water collecting main canal 11 is used to discharge part of the water body treated by the iron-carbon composite fluidized filler 20. The air lifter 15 is used to blow the remaining water body in the water collecting main canal 11 into the water inlet main pipe 2 under the action of the air blower, so as to improve the flow rate and oxygen content of the water body in the water inlet main pipe 2, and thus the iron-carbon composite fluidized filler 20 is in a fluidized state.

[0034] Further, the iron-carbon composite fluidized filler 20 comprises iron-carbon particle balls and sodium chloride modified zeolite particle balls.

[0035] Further, the lateral flow spout 9 comprises a plurality of flow spout pipes which are arranged to be inclined relative to the vertical direction. All the flow spout pipes are arranged in parallel, and the side walls of adjacent flow spout pipes are fixedly connected. In this embodiment, the flow spout pipes are hexagonal pipe bodies, and the upper and lower ends of the lateral flow spout 9 are both honeycomb structures.

[0036] Further, the top side wall of the reaction tower body 1 is further provided with an air lifting groove 13. The air lifting groove 13 is connected to the top of the water inlet main pipe 2. The air lifting groove 13 is connected to the water collecting main canal 11. The air lifter 15 is arranged in the air lifting groove 13.

[0037] Further, the edge of the air lifting groove 13 is provided with a water collecting groove 12. The air lifting groove 13 is connected to the water collecting main canal 11 through the water collecting groove 12. The air lifting groove 13 is provided with a partition plate. The partition plate divides the cavity in the air lifting groove 13 into a water storage cavity and a reflux cavity 16. The water collecting main canal 11 is connected to the water storage cavity. The air lifter 15 is located in the water storage cavity. The partition plate is provided with a reflux hole. The reflux cavity 16 is connected to the upper end of the water inlet main pipe 2 and the water inlet 18.

[0038] Further, an adjustable weir gate 17 is arranged on the reflux hole. The adjustable weir gate 17 is used to adjust the opening degree of the reflux hole, so as to adjust the reflux flow of the water body in the air lifting groove 13.

[0039] Further, the particle size of the iron-carbon composite fluidized filler 20 is 0.5-0.6 mm.

[0040] Further, the lower end of the water inlet main pipe 2 extends into the reaction tower body 1 through the reaction tower body 1. A plurality of water distribution branch pipes 3 are connected to the upper end of the water inlet main pipe 2. The water distributor 4 is connected to the end of the water distribution branch pipe 3.

[0041] Further, a plurality of water collecting channels 10 are arranged above the lateral flow inclined device 9, and all the water collecting channels 10 are connected with the water collecting main channel 11.

[0042] Further, a plurality of crystal discharging branch pipes 6 are vertically connected with the crystal discharging main pipe 5, and the crystal discharging branch pipes 6 and the crystal discharging main pipe 5 are both provided with crystal discharging holes; one end of the crystal discharging main pipe 5 is provided with a crystal discharging port 7, the crystal discharging port 7 penetrates through the reaction tower body 1, and a crystal discharging valve is further arranged on the crystal discharging port 7; the crystal discharging valve is opened at a fixed time to discharge the accumulated crystal bodies 21 in the crystal discharging main pipe 5.

[0043] The working process of the utility model is as follows: the wastewater to be treated enters the reflux cavity 16 through the water inlet 18, mixes with the reflux water in the reflux cavity 16, and then forms a uniform upward water flow field through the water inlet main pipe 2, the water distribution branch pipe 3 and the water distributor 4; the upward flow velocity of the water flow is controlled at 30mm / s; at this time, the iron-carbon composite filler 20 expands under the driving of the water flow, enters the fluidized state, and forms an iron-carbon filler fluidized bed layer; at this time, the iron-carbon composite fluidized filler 20 is uniformly distributed in the bed layer and moves irregularly in a small range; meanwhile, the collision and friction between the filler particles of the iron-carbon composite fluidized filler 20, between the filler particles and the reactor, and between the fluid and the reactor are increased, and the exchange rate and the reaction rate are greatly increased; the composition of the iron-carbon composite fluidized filler 20 is iron-carbon particle balls and sodium chloride modified zeolite particle balls, and the particle diameter is controlled at 0.5-0.6mm; in addition to the original cell reaction, the oxidation-reduction reaction, the flocculation and the co-precipitation in the traditional iron-carbon micro-electrolysis process, the sodium chloride modified zeolite in the iron-carbon composite fluidized filler 20 can also effectively adsorb and remove the ammonia nitrogen in the wastewater, and the adsorption rate of the ammonia nitrogen can reach more than 80%; due to the chemical structure of the zeolite crystal, the zeolite has the characteristics of high porosity, large specific surface area, high-efficiency selective adsorption, acid resistance, heat resistance and radiation resistance, and the adsorption capacity of the sodium chloride modified zeolite for the ammonia nitrogen can be as high as 0.8mg / g of zeolite; in addition to being used as an adsorption medium, the zeolite will no longer have an adsorption effect on its surface after saturation, and at this time, it will exist as a crystal nucleus in the fluidized bed; the iron in the iron-carbon composite fluidized filler 20 produces Fe 2+ , Fe 2+ In an oxygen environment, the oxidation reaction will occur to generate OH· and Fe 3+ , Fe 3+The FeOOH crystals are generated on the surface of the zeolite crystal seeds, and since the iron-carbon micro-electrolysis environment is an acidic environment, the generation speed of the crystals is relatively slow, and the generation only occurs after the adsorption of the zeolite is saturated, and as the crystals gradually grow, the water flow is not fast enough to reach the fluidized state, and thus the crystals sink and accumulate on the supporting plate 8, and the iron-carbon composite fluidized filler 20 is periodically supplemented from the top of the reaction tower body 1 to compensate for the loss of the iron-carbon composite fluidized filler 20, so as to achieve the micro-electrolysis reaction. After the wastewater is purified by the iron-carbon micro-electrolysis reaction, the wastewater rises into the top of the reaction tower body 1, and a lateral flow elbow 9 is arranged above the fluidized bed of the micro-electrolysis tower, the lateral flow elbow 9 utilizes the principle of "shallow sedimentation" to make the iron-carbon composite fluidized filler 20 and the generated crystals 21 flow along the inner wall surface of the lateral flow elbow 9 and flow back to the fluidized bed, so as to prevent the iron-carbon composite fluidized filler 20 from being carried away by the water flow and prevent the crystals 21 from overflowing, and after the wastewater flows through the elbow sedimentation zone, the clean water is collected through the water collecting channel 10, so that a good fluidized state is realized in the fluidized bed reactor, and the clean water collected through the water collecting channel 10 is converged into the water collecting main channel 11, part of which is discharged through the water outlet 19, and the other part enters the air lifting tank 13, air is introduced into the air lifting tank through the air lifting device 15, the main principle of the air lifting device 15 is that air is introduced into the bottom of the air lifting device, and since the air density is small, a pressure difference is generated, and under the action of the pressure, the backflow water at the bottom of the air lifting device is lifted to a high place, and in the process of lifting the backflow water, oxygen in the air is also dissolved into the backflow water, so that the backflow water is oxygenated, and the backflow water of the air lifting tank flows into the backflow cavity 16, and the adjustable weir gate 17 is arranged in the backflow cavity 16, and the height of the weir gate 17 can be adjusted to adjust the flow of the backflow water, so as to control the rising flow rate in the reactor.

[0044] In this document, the front, back, up, down and other orientation words are defined according to the positions of the parts in the drawings and the positions of the parts relative to each other, only for the purpose of expressing the technical scheme clearly and conveniently. It should be understood that the use of the orientation words should not limit the scope of the application claimed.

[0045] In the case of no conflict, the above-mentioned embodiments and features in the embodiments can be combined with each other.

[0046] The above-mentioned only the preferred embodiments of the present application, and not for limiting the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A fluidized bed iron-carbon micro-electrolysis reactor with enhanced denitrification function, characterized in that: This includes the reaction tower body, the main water inlet pipe, and the air lift unit; The reaction tower body includes a support plate with multiple water permeable holes and multiple water distributors at the bottom of the support plate. All water distributors are connected to the lower end of the main water inlet pipe. The support plate is filled with iron-carbon composite fluidized packing, and the bottom of the iron-carbon composite fluidized packing is provided with a crystal discharge manifold, which passes through the reaction tower body; A lateral flow deflector is provided above the iron-carbon composite fluidized packing material, and a main water collection channel is provided above the lateral flow deflector. One end of the main water collection channel extends out of the reaction tower body, and the other end is connected to an air lift. The air lift is connected to the upper end of the main water inlet pipe. The air inlet of the air lift is connected to a blower. A water inlet is also provided at the upper end of the main water inlet pipe.

2. The fluidized bed iron-carbon micro-electrolysis reactor with enhanced denitrification function according to claim 1, characterized in that: The lateral flow tilter includes multiple flow tilt tubes that are inclined relative to the vertical direction. All flow tilt tubes are arranged in parallel and the side walls of adjacent flow tilt tubes are fixedly connected.

3. The fluidized bed iron-carbon micro-electrolysis reactor with enhanced denitrification function according to claim 1, characterized in that: The top side wall of the reaction tower is also provided with an air lifting trough, which is connected to the top of the main water inlet pipe and connected to the main water collection channel. The air lifter is installed inside the air lifting trough.

4. A fluidized bed iron-carbon micro-electrolysis reactor with enhanced denitrification function according to claim 3, characterized in that: The air lifting trough is equipped with a partition plate, which divides the cavity inside the air lifting trough into a water storage cavity and a return cavity. The main water collection channel is connected to the water storage cavity, and the air lifter is located inside the water storage cavity. The partition plate is equipped with a return hole.

5. A fluidized bed iron-carbon micro-electrolysis reactor with enhanced denitrification function according to claim 4, characterized in that: An adjustable weir gate is also provided on the reflux hole.

6. A fluidized bed iron-carbon micro-electrolysis reactor with enhanced denitrification function according to claim 1, characterized in that: The particle size of the iron-carbon composite fluidized packing is 0.5-0.6 mm.

7. A fluidized bed iron-carbon micro-electrolysis reactor with enhanced denitrification function according to claim 1, characterized in that: The lower end of the main water inlet pipe extends through the reaction tower body and into the reaction tower body. Multiple water distribution branch pipes are connected to the main water inlet pipe, and the water distributor is connected to the end of the water distribution branch pipes.

8. A fluidized bed iron-carbon micro-electrolysis reactor with enhanced denitrification function according to claim 1, characterized in that: Above the lateral flow tilter, there are also multiple water collection channels, all of which are connected to the main water collection channel.

9. A fluidized bed iron-carbon micro-electrolysis reactor with enhanced denitrification function according to claim 1, characterized in that: Multiple crystal discharge branch pipes are vertically connected to the main crystal discharge pipe. Crystal discharge holes are distributed on both the main crystal discharge branch pipes and the main crystal discharge pipe. A crystal discharge port is provided at one end of the main crystal discharge pipe. The crystal discharge port passes through the reaction tower body and is also provided with a crystal discharge valve.

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