CN219449452U - Reactor for treating landfill leachate by iron complexing Fenton - Google Patents

Abstract

The application discloses a reactor for treating landfill leachate by iron complexing Fenton-like treatment belongs to the technical field of wastewater treatment. The reactor comprises a tank body, a stirring device and a water distribution device; the stirring device comprises a stirring paddle, the stirring paddle is positioned in the tank body, the water distribution device comprises a main water distribution pipe and a branch water distribution pipe, the main water distribution pipe is connected with the branch water distribution pipe, and the joint of the branch water distribution pipe and the main water distribution pipe is the middle lower part of the main water distribution pipe; the tank body is communicated with a water distribution main pipe through a water distribution branch pipe, and the water distribution main pipe is provided with at least one water inlet. The main use of the application is to provide a reactor for treating landfill leachate by iron complexing Fenton, so that the landfill leachate entering the reactor can be fully contacted with an oxidant, a catalyst and the like, and the technical problem of low filler utilization rate of the existing landfill leachate treatment equipment is solved.

Description

Reactor for treating landfill leachate by iron complexing Fenton

Technical Field

The application relates to the technical field of wastewater treatment, in particular to a reactor for treating landfill leachate by iron complex Fenton.

Background

Landfill is used as a waste disposal site, however, landfill by-products, landfill leachate, have a significant negative impact on environmental quality. Landfill leachate pollution is caused by the penetration of water contained in the garbage itself and landfill water along with precipitation into soil, groundwater and surface water. Researches show that the landfill leachate often contains a large amount of toxic and harmful substances and pollutants with environmental risks, including heavy metals, pathogenic bacteria, microplastic and the like, and has a large secondary pollution risk.

Advanced oxidation technology is commonly used for pretreatment of landfill leachate. Among them, fenton oxidation has been applied to sewage treatment in recent years due to its characteristics of single process, flexible operation, rapidness and high efficiency. Fenton reagent (Fe2+/H2O 2) is a strong oxidant, fe2+ is catalyzed/H2O 2 is rapidly decomposed, generated hydroxyl free radical OH can rapidly and non-selectively oxidize and degrade various organic matters, but the problems of large dosage of medicament, low utilization rate, high treatment cost and the like exist in the actual application of Fenton oxidation generally.

Fenton oxidation often requires the dependence of excessive amounts of Fe ²⁺ The reaction proceeds, but with an excess of Fe ²⁺ Part of the hydroxyl radicals are consumed and oxidized into Fe ³⁺ A precipitate forms, limiting the duration of the oxidation. Studies have shown that Fe can be achieved in the presence of Tannic Acid (a strong transition metal chelator and a reducing agent, tannic Acid) ³⁺ To Fe ²⁺ Is a bad regeneration of the (c). Tannic acid is a typical phenolic compound, a secondary metabolite derived from higher plants, and has been widely used for drinking water and industrial sewage treatmentIs a kind of medium.

In the related art, for example, chinese patent document (publication No. CN 209853893U) describes a treatment device for landfill leachate, which comprises an acidification air floatation precipitation unit, a Fenton oxidation unit, a neutralization coagulation precipitation unit and matched dosing equipment, and is suitable for a middle treatment unit for biochemical treatment of leachate in a middle-aged landfill, and can also be used as a pretreatment unit and a deep treatment unit for biochemical treatment.

In the related technology, for example, chinese patent literature (publication No. CN 203833731U) describes a device for jointly Fenton treating landfill leachate by using a polyiron reactor at the front section of the device, adding a polyiron and a pH regulator into the landfill leachate, treating the landfill leachate at the rear section by using a Fenton reactor, adding a Fenton reagent and the pH regulator into the treatment liquid, uniformly mixing, performing strong oxidation reaction in the mixed liquid, oxidizing most of organic matters into CO2 and H2O, and finally adding alkali in a precipitation tank for coagulating sedimentation, and separating most of unoxidized pollutants from water to achieve the purpose of advanced treatment.

By analyzing the related art, the Fenton oxidation method for landfill leachate treatment needs to use special landfill leachate treatment equipment, and various fillers added into the equipment react with wastewater through the landfill leachate treatment equipment, so that the wastewater is treated. However, the existing landfill leachate treatment equipment still has the problems of low Fenton reaction efficiency, large dosage of the medicament and the like, and the problems are related to the filler components for the leachate and also related to unreasonable design of the landfill leachate treatment equipment.

Disclosure of Invention

1. Technical problem to be solved by the utility model

The embodiment of the application solves the technical problem of low filler utilization rate in Fenton landfill leachate treatment in the prior art by providing the reactor for Fenton landfill leachate treatment by iron complexing.

2. Technical proposal

In order to achieve the aim, the application provides a reactor for treating landfill leachate by iron complexing Fenton.

A reactor for iron complexing Fenton-like treatment of landfill leachate according to the present application comprises: comprises a tank body, a stirring device and a water distribution device;

wherein the stirring device comprises a stirring paddle, and the stirring paddle is positioned in the tank body;

the water distribution device comprises a main water distribution pipe and branch water distribution pipes, wherein the main water distribution pipe is connected with the branch water distribution pipes, and the joint of the branch water distribution pipes and the main water distribution pipe is the middle lower part of the main water distribution pipe;

the tank body is communicated with the main water distribution pipe through the branch water distribution pipe, and the main water distribution pipe is provided with at least one water inlet.

Furthermore, the main water distribution pipe is provided with a first water inlet and a second water inlet.

Further, the included angle between the main water distribution pipe and the branch water distribution pipe is 45 degrees.

Further, the diameter ratio of the main water distribution pipe to the branch water distribution pipe is 1.5-4.

Furthermore, the tank body is a cylinder or a prism, the water distribution device is annular, and the inner diameter of the water distribution device is larger than the outer diameter of the tank body.

Further, the first water inlet and the second water inlet of the water distribution device are arranged in parallel.

Further, the stirring paddles at least comprise an upper group, a middle group and a lower group, the length of the lower group of stirring paddles is not longer than that of the middle group of stirring paddles, and the length of the middle group of stirring paddles is not longer than that of the upper group of stirring paddles.

Further, the stirring paddle is of a fan-shaped spiral structure.

Further, the tank body is provided with a three-phase separator, the three-phase separator is positioned at the upper side of the stirring paddle, and a filler reaction zone is formed at the lower side of the three-phase separator.

Further, the tank body is provided with an air outlet and a water outlet, the air outlet and the water outlet are both positioned on the upper side of the three-phase separator, the air outlet is used for exhausting air, and the water outlet is used for exhausting treated sewage.

3. Advantageous effects

The utility model provides a reactor of iron complex Fenton class landfill leachate, including the jar body, agitating unit and water distribution device, through setting up the stirring rake of agitating unit the filler reaction zone of jar body, water distribution device includes water distribution main pipe and water distribution branch pipe, the water distribution main pipe is through the mode of water distribution branch pipe intercommunication jar body for the landfill leachate and oxidant, material such as catalyst can be from this application iron complex Fenton class treatment landfill leachate's reactor can realize intaking evenly, and get into the landfill leachate in the filler reaction zone, oxidant and catalyst etc. all can fully contact, the pollutant in the landfill leachate has effectively been degraded.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application and to provide a further understanding of the application with regard to the other features, objects and advantages of the application. The drawings of the illustrative embodiments of the present application and their descriptions are for the purpose of illustrating the present application and are not to be construed as unduly limiting the present application. In the drawings:

FIG. 1 is a schematic diagram of a reactor for iron complex Fenton-like treatment of landfill leachate according to an embodiment of the present application;

FIG. 2 is a schematic view of a water distribution device according to an embodiment of the present application;

reference numerals in the schematic drawings illustrate:

10. a stirring device; 11. stirring paddles;

20. an exhaust port; 21. a water outlet; 22. a three-phase separator; 23. a tank body; 24. a filler reaction zone;

30. a water distribution device; 31. a first water inlet; 32. a water distribution main pipe; 33. a water distribution branch pipe; 34. a second water inlet;

Detailed Description

In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first", "second", and the like in the description and the claims of the present application and the above figures are used for distinguishing similar objects, and are not necessarily used for describing a particular sequence or order, such as the first water inlet 31 and the second water inlet 34 in the present application. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein.

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal", etc. refer to the directions or positional relationships indicated on the basis of the drawings, such as the paddles 11 in the present application, and are divided into three groups, i.e., upper, middle and lower, and the directions are better described on the basis of the drawings, so that understanding is facilitated. These terms are used primarily to better describe the present application and its embodiments and are not intended to limit the indicated device, element or component to a particular orientation or to be constructed and operated in a particular orientation.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "configured," "provided," "connected," "coupled," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Referring to fig. 1-2, a reactor for treating landfill leachate by iron complexing Fenton-like treatment ("reactor for treating landfill leachate by iron complexing Fenton-like treatment" hereinafter abbreviated as "reactor") of the present application includes a tank 23, a stirring device 10 and a water distribution device 30. Wherein, a three-phase separator 22 is arranged in the tank body 23, and a filler reaction zone 24 is formed at the lower side of the three-phase separator 22. The tank 23 is provided with an air outlet 20 and a water outlet 21, the air outlet 20 and the water outlet 21 are both positioned on the upper side of the three-phase separator 22, the air outlet 20 is used for discharging the gas in the reactor, and the water outlet 22 is used for discharging the sewage treated by the reactor.

The stirring device 10 comprises a stirring paddle 11, a rotating shaft and a motor, wherein the stirring shaft is driven by the motor to rotate, the stirring paddle 11 is arranged on the stirring shaft, the stirring paddle 11 is positioned in the tank body 23, various substances entering the tank body 23 can be stirred through the rotation of the stirring paddle 11, and the full reaction of the relevant substances is facilitated. Wherein the stirring paddles 11 comprise at least an upper group, a middle group and a lower group, the upper stirring paddle refers to the stirring paddle close to the three-phase separator 22, the lower stirring paddle refers to the stirring paddle close to the bottom of the reactor, and the middle stirring paddle is positioned between the upper stirring paddle and the lower stirring paddle.

Wherein the length of the lower group of stirring paddles is not longer than that of the middle group of stirring paddles, and the middle group of stirring paddles is not longer than that of the upper group of stirring paddles. The sewage or the filler entering the filler reaction zone 24 of the reactor continuously reacts with the stirring of the stirring paddle 11, and solid or gel substances exist in the sewage and the filler, and the sewage and the filler settle towards the bottom of the reactor under the action of gravity, which means that the resistance of the lower stirring paddle near the bottom of the reactor is larger than that of the middle stirring paddle and the upper stirring paddle, so that the upper, middle and lower stirring paddles have proper lengths for the stirring of the filler reaction zone 24. In order to avoid the impact on the filler by breaking up the filler in the filler reaction zone 24 when the stirring paddle 11 rotates rapidly, the structure of the stirring paddle is a fan-shaped spiral structure.

The water distribution device 30 of the reactor comprises a water distribution main pipe 32 and a water distribution branch pipe 33, wherein the water distribution main pipe 32 is connected with the water distribution branch pipe 33. The main water distribution pipe 32 is taken as a main body, and the water distribution branch pipe 33 can be connected with any position such as the upper part, the middle part or the lower part of the main water distribution pipe 32 based on the horizontal height, and the joint of the water distribution branch pipe 33 and the main water distribution pipe 32 of the water distribution device 30 in the application is the middle lower part of the main water distribution pipe 32. The design of this application can effectively avoid sediment such as mud to fall in the water distribution main pipe 32, because the level of water distribution main pipe 32 is higher than the connector minimum of water distribution main pipe 32 and water distribution branch pipe 33 junction basically, after sewage such as landfill leachate gets into water distribution main pipe 32, sewage just can directly flow into in the water distribution branch pipe 33, and then gets into the jar internally.

In order to facilitate sewage and filler entering the filler reaction zone 24 of the reactor, the main water distribution pipe 32 is provided with at least one water inlet, and the main water distribution pipe 32 in the embodiment of the application is provided with a first water inlet 31 and a second water inlet 34. The first water inlet 31 and the second water inlet 34 are relatively parallel, and when the first water inlet 31 and the second water inlet 34 feed water at the same time, the water circulation directions formed in the main water distribution pipe 32 are the same, so that no opposite flushing is formed between water flows.

For further optimizing the reactor of the present application, the tank body 23 is a cylinder or a prism, the shape of the tank body 23 is matched, the water distribution device 30 is annular, and the inner diameter of the water distribution device 30 is larger than the outer diameter of the tank body. The main water distribution pipe 32 of the water distribution device adopts a regular octagonal annular structure, each side of the corresponding regular octagon is connected with one branch water distribution pipe 33, an included angle between the main water distribution pipe 32 and the branch water distribution pipe 33 is 45 degrees, the diameter ratio of the main water distribution pipe 32 to the branch water distribution pipe 33 is 1.5-4, and the branch water distribution pipe 33 is communicated with the filler reaction zone 24 of the reactor. This structural design allows for a more uniform mixing of the materials such as sewage or packing entering the reactor packing reaction zone 24.

One working process of the reactor is as follows, and landfill leachate enters a main water distribution pipe 32 from a first water inlet 31 and enters a filler reaction zone 24 in a tank body 23 through a water distribution branch pipe 33. Wherein, the pH value of the landfill leachate is adjusted to 3-5 in advance, the landfill leachate and ferrous sulfate enter a main water distribution pipe 32 through a first water inlet at the same time, are combined in the main water distribution pipe 32, and enter a filler reaction zone 24 through a branch water distribution pipe 33; meanwhile, hydrogen peroxide and tannic acid enter the filler reaction zone 24 of the reactor through the second water inlet via the main water distribution pipe 32 and the branch water distribution pipe 33. Under the action of the stirring device 10, the landfill leachate is fully mixed with the catalyst, the oxidant and the complexing agent to generate chain reaction, and tannic acid promotes the reaction between ferrous sulfate and hydrogen peroxide, so that the hydroxyl radical generated by the reaction is greatly increased, and the Fenton reaction efficiency is improved.

In addition, the filler enters the filler reaction zone 24, so that the suspended filler is filled in the reactor filler reaction zone 24, the iron-based catalyst loaded by the suspended filler is a donor mineral, iron ions are continuously dissolved in the meta-acid solution, heterogeneous Fenton-like reaction is carried out with the added hydrogen peroxide and tannic acid, the Fenton reaction is enhanced, the amount of the added ferrous sulfate medicine is reduced, the generation amount of iron mud is reduced, and therefore, the medicine cost and the sludge treatment cost are greatly reduced, and the requirements of energy conservation and environmental protection are also realized.

When the wastewater, suspended filler and gas generated by the reaction flow to the three-phase separator 22 under stirring, the filler is blocked from falling back to the reaction zone and continuously reacts with the mixed liquid in the filler reaction zone 24, water is discharged through the water outlet 21 of the three-phase separator 22 and enters the next reaction unit, and the gas escapes through the gas outlet 20 or enters the gas collecting device.

Through this kind of design, the reactor of this application can intake even and intensive mixing, makes waste water, oxidant and catalyst fully contact, the difficult pollutant of degradation in the effective degradation landfill leachate.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. 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 (9)

1. The reactor for treating landfill leachate by iron complexing Fenton comprises a tank body (23), a stirring device (10) and a water distribution device (30);

wherein, agitating unit (10) includes stirring rake (11), stirring rake (11) are located in jar body (23), its characterized in that:

the water distribution device (30) comprises a main water distribution pipe (32) and a branch water distribution pipe (33), wherein the main water distribution pipe (32) is connected with the branch water distribution pipe (33), and the joint of the branch water distribution pipe (33) and the main water distribution pipe (32) is the middle lower part of the main water distribution pipe (32);

the tank body (23) is communicated with the main water distribution pipe (32) through the branch water distribution pipe (33), the main water distribution pipe (32) is provided with a first water inlet (31) and a second water inlet (34), the first water inlet (31) is used for inputting landfill leachate into the main water distribution pipe (32), and the second water inlet (34) is used for inputting oxidant into the main water distribution pipe (32).

2. The reactor for treating landfill leachate by iron complex Fenton-like treatment according to claim 1, wherein: the included angle between the main water distribution pipe (32) and the branch water distribution pipe (33) is 45 degrees.

3. The reactor for treating landfill leachate by iron complex Fenton-like treatment according to claim 1, wherein: the diameter ratio of the main water distribution pipe (32) to the branch water distribution pipe (33) is 1.5-4.

4. The reactor for treating landfill leachate by iron complex Fenton-like treatment according to claim 1, wherein: the tank body (23) is a cylinder or a prism, the water distribution device (30) is annular, and the inner diameter of the water distribution device (30) is larger than the outer diameter of the tank body (23).

5. The reactor for treating landfill leachate by iron complex Fenton-like treatment according to claim 1, wherein: the first water inlet (31) and the second water inlet (34) of the water distribution device (30) are arranged in parallel.

6. The reactor for treating landfill leachate by iron complex Fenton-like treatment according to claim 1, wherein: the stirring paddles (11) at least comprise an upper group, a middle group and a lower group, the length of the lower group of stirring paddles is not longer than that of the middle group of stirring paddles, and the length of the middle group of stirring paddles is not longer than that of the upper group of stirring paddles.

7. The reactor for treating landfill leachate by iron complex Fenton-like treatment according to claim 6, wherein: the stirring paddle (11) is of a fan-shaped spiral structure.

8. The reactor for treating landfill leachate by iron complex Fenton-like treatment according to claim 1, wherein: the tank body (23) is provided with a three-phase separator (22), the three-phase separator (22) is positioned on the upper side of the stirring paddle (11), and a filler reaction zone (24) is formed on the lower side of the three-phase separator (22).

9. The reactor for treating landfill leachate by iron complex Fenton-like treatment according to claim 8, wherein: the tank body (23) is provided with an air outlet (20) and a water outlet (21), the air outlet (20) and the water outlet (21) are both positioned on the upper side of the three-phase separator (22), the air outlet (20) is used for exhausting air, and the water outlet (21) is used for exhausting treated sewage.