A fenton oxidation wastewater treatment device and a wastewater treatment system

Abstract

This utility model relates to a Fenton oxidation wastewater treatment device and wastewater treatment system, which includes a Fenton oxidation reaction tank, an aeration component, an inlet component, a first dosing component, a second dosing component, and an effluent component. The aeration component forms an aeration zone, and the portion of the Fenton oxidation reaction tank located in the middle of the aeration zone forms a reaction zone. The inlet end of the inlet component extends to the top of the reaction zone. The dosing end of the first dosing component extends to the top of the reaction zone. The dosing end of the second dosing component extends to the top of the reaction zone. The inlet end of the effluent component is connected to the lower portion of the reaction zone. Since the inner diameter of the aeration zone gradually decreases in the vertical direction, a tumble flow can be formed from the aeration zone to the reaction zone. The wastewater introduced by the inlet component flows downward with the help of the tumble flow and mixes thoroughly with hydroxyl radicals, which can efficiently decompose organic matter in the wastewater and limit the size of the reaction space.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a Fenton oxidation wastewater treatment device and wastewater treatment system. Background Technology

[0002] The Fenton process significantly improves the biochemical properties of recalcitrant organic matter, high-molecular-weight organic matter, toxic organic matter, heteroatom-containing organic matter, and characteristic pollutants in industrial wastewater. It breaks down large, recalcitrant, and toxic organic molecules into smaller, more readily degradable, and less toxic intermediates, creating favorable conditions for subsequent biological treatment. Therefore, the Fenton process is often used as a pretreatment technology in conjunction with biological treatment processes (such as activated sludge and biofilters) to effectively improve overall wastewater treatment efficiency.

[0003] When ferrous ions are mixed with hydrogen peroxide, hydroxyl radicals can be generated. Hydroxyl radicals have extremely strong oxidizing power (redox potential of 2.8V) and can non-selectively oxidize and degrade most organic matter.

[0004] Because the existence time of hydroxyl radicals is extremely short, the Fenton oxidation reaction has certain requirements on both reaction time and reaction space. Specifically:

[0005] 1) If the reaction time is too short, the reaction may be incomplete and the organic matter may not be completely degraded;

[0006] 2) If the reaction time is too long, hydrogen peroxide may consume too much ferrous ions, which will be oxidized to ferric ions, resulting in poor degradation of organic matter.

[0007] 3) If the reaction space is too large, hydroxyl radicals are easily deactivated during the transfer process, resulting in poor degradation of organic matter.

[0008] In summary, a wastewater treatment device with a small reaction space and the ability to rapidly mix wastewater and hydroxyl radicals is needed to effectively implement the Fenton oxidation reaction. Utility Model Content

[0009] In view of this, it is necessary to provide a Fenton oxidation wastewater treatment device and a wastewater treatment system.

[0010] On one hand, this utility model provides a Fenton oxidation wastewater treatment device, including a Fenton oxidation reaction tank, an aeration component, an inlet component, a first dosing component, a second dosing component, and an effluent component; the aeration component is installed at the bottom of the Fenton oxidation reaction tank and forms a conical aeration zone, the inner diameter of the aeration zone gradually decreases in the vertical upward direction, and the part of the Fenton oxidation reaction tank located in the middle of the aeration zone forms a reaction zone; the effluent end of the inlet component extends to the top of the reaction zone; the dosing end of the first dosing component extends to the top of the reaction zone; the dosing end of the second dosing component extends to the top of the reaction zone; the inlet end of the effluent component is connected to the lower part of the reaction zone.

[0011] Furthermore, the aeration assembly includes an annular aeration pipe and multiple aeration nozzles. The annular aeration pipe is externally connected to an aerator. The annular aeration pipe is positioned at the bottom edge of the Fenton oxidation reaction tank. The multiple aeration nozzles are evenly arranged around the annular aeration pipe and are all connected to the annular aeration pipe. The multiple aeration nozzles are all inclined upwards in the direction close to the reaction area.

[0012] Furthermore, the water inlet assembly includes a Fenton oxidation water inlet pipe, one end of which is connected to wastewater, and the other end of which extends to the central region at the top of the reaction zone.

[0013] Furthermore, the first dosing assembly includes a first dosing tube and a first dosing pump, one end of the first dosing tube being connected to hydrogen peroxide via the first dosing pump, and the other end of the first dosing tube extending to the central region at the top of the reaction zone.

[0014] Furthermore, the second dosing assembly includes a second dosing tube and a second dosing pump. One end of the second dosing tube is connected to the ferrous ion solution via the second dosing pump, and the other end of the second dosing tube extends to the central region at the top of the reaction zone.

[0015] Furthermore, the water outlet assembly includes a Fenton oxidation water outlet pipe, one end of which extends to the bottom of the reaction zone.

[0016] On the other hand, the present invention also provides a wastewater treatment system, including the Fenton oxidation wastewater treatment device as described above, and further including a pretreatment device and a posttreatment device, wherein the pretreatment device, the Fenton oxidation wastewater treatment device and the posttreatment device are connected in sequence.

[0017] Furthermore, the pretreatment device includes an iron-carbon reaction tank, a pretreatment inlet pipe, a pretreatment acid addition pipe, and a pretreatment outlet pipe. One end of the pretreatment inlet pipe extends to the bottom of the iron-carbon reaction tank, and one end of the pretreatment acid addition pipe extends into the iron-carbon reaction tank. A packing inlet is provided at the top of the iron-carbon reaction tank. One end of the pretreatment outlet pipe is connected to the iron-carbon reaction tank, and the other end of the pretreatment outlet pipe is connected to the inlet assembly.

[0018] Furthermore, the pretreatment device also includes a reflux pipe, a reflux pump, and a conical guide plate. The reflux pipe is located outside the iron-carbon reaction tank and the reflux pump is installed on this part. The top end of the reflux pipe extends into the iron-carbon reaction tank and is located above the iron-carbon reaction tank. The bottom end of the reflux pipe extends into the iron-carbon reaction tank and is located below the iron-carbon reaction tank. The conical guide plate is fixedly installed on the inner bottom wall of the iron-carbon reaction tank, and its top end forms a conical guide surface that gradually expands downward. The bottom end of the reflux pipe extends in a direction tangential to the conical guide surface.

[0019] Furthermore, the post-treatment device includes a post-treatment tank, which includes a degassing chamber, a pH adjustment chamber, a dosing chamber, a flocculation chamber, and a sedimentation chamber that are connected in sequence. The post-treatment tank is connected to the effluent assembly.

[0020] Compared with existing technologies, the Fenton oxidation reactor is aerated using aeration components, forming an aeration zone rich in bubbles and flowing upwards. Since the inner diameter of the aeration zone gradually decreases in the vertical direction, a tumble flow is formed from the aeration zone to the reaction zone. The ferrous ion solution and hydrogen peroxide added to the top of the reaction zone by the first and second dosing components rapidly contact and generate hydroxyl radicals under the impetus of the tumble flow. At the same time, the wastewater introduced by the influent component flows downwards with the tumble flow and mixes thoroughly with the hydroxyl radicals, which can efficiently decompose organic matter in the wastewater. Since the top space of the reaction zone is small, the size of the reaction space can be limited, and finally the wastewater is discharged from the bottom of the reaction zone through the effluent component. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall structure of the Fenton oxidation wastewater treatment device and wastewater treatment system provided in this embodiment of the utility model. Detailed Implementation

[0022] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0023] like Figure 1 As shown, in one aspect, this utility model provides a Fenton oxidation wastewater treatment device, including a Fenton oxidation reaction tank 100, an aeration component 200, an inlet component 300, a first dosing component 400, a second dosing component 500, and an effluent component 600; the aeration component 200 is installed at the bottom of the Fenton oxidation reaction tank 100 and forms a conical aeration zone 110, the inner diameter of the aeration zone 110 gradually decreases in the vertical upward direction, and the part of the Fenton oxidation reaction tank 100 located in the middle of the aeration zone 110 forms a reaction zone 120; the effluent end of the inlet component 300 extends to the top of the reaction zone 120; the dosing end of the first dosing component 400 extends to the top of the reaction zone 120; the dosing end of the second dosing component 500 extends to the top of the reaction zone 120; the inlet end of the effluent component 600 is connected to the lower part of the reaction zone 120.

[0024] In practice, the Fenton oxidation reaction tank 100 is aerated by the aeration component 200, thereby forming an aeration zone 110 rich in bubbles and flowing upward. Since the inner diameter of the aeration zone 110 gradually decreases in the vertical direction, a tumble flow can be formed from the aeration zone 110 to the reaction zone 120. The ferrous ion solution and hydrogen peroxide added to the top of the reaction zone 120 by the first dosing component 400 and the second dosing component 500 are rapidly contacted and generated by the tumble flow. At the same time, the wastewater introduced by the influent component 300 flows downward with the help of the tumble flow and mixes thoroughly with the hydroxyl radicals, which can efficiently decompose the organic matter in the wastewater. Since the top space of the reaction zone 120 is small, the size of the reaction space can be limited. Finally, the wastewater is discharged from the lower part of the reaction zone 120 through the effluent component 600.

[0025] In this embodiment, the Fenton oxidation reaction tank 100 provides a carrier for the Fenton oxidation reaction.

[0026] In this embodiment, the aeration component 200 is installed at the bottom of the Fenton oxidation reaction tank 100 and forms a conical aeration zone 110. The inner diameter of the aeration zone 110 gradually decreases in the vertical upward direction. The part of the Fenton oxidation reaction tank 100 located in the middle of the aeration zone 110 forms the reaction zone 120.

[0027] Since the aeration direction is upward, the water in the aeration zone 110 flows upward. When it reaches the top, the water in the aeration zone 110 flows into the reaction zone 120 from above and pushes the water in the reaction zone 120 downward, thus forming a roller. Without the need for stirring equipment, the hydroxyl radicals in the reaction zone 120 can fully contact and react with the organic matter in the wastewater.

[0028] Meanwhile, this embodiment also limits the shape of the aeration zone 110 to a cone shape, thereby limiting the space at the top of the reaction zone 120 to be small, avoiding excessive reaction space and deactivation of hydroxyl radicals during the transfer process.

[0029] In one embodiment, the aeration assembly 200 includes an annular aeration pipe and multiple aeration nozzles. The annular aeration pipe is connected to an aerator. The annular aeration pipe is disposed at the bottom edge of the Fenton oxidation reaction tank 100. The multiple aeration nozzles are evenly arranged around the annular aeration pipe and are all connected to the annular aeration pipe. The multiple aeration nozzles are all inclined upwards in the direction close to the reaction area 120.

[0030] The inlet assembly 300 includes a Fenton oxidation inlet pipe, one end of which is connected to wastewater, and the other end of which extends to the center of the top of the reaction zone 120. The inlet assembly 300 allows wastewater to be introduced into the top of the reaction zone 120 of the Fenton oxidation reaction tank 100.

[0031] The first dosing assembly 400 includes a first dosing pipe and a first dosing pump. One end of the first dosing pipe is connected to hydrogen peroxide via the first dosing pump, and the other end of the first dosing pipe extends to the central region at the top of the reaction zone 120. The first dosing assembly 400 allows hydrogen peroxide to be introduced to the top of the reaction zone 120 of the Fenton oxidation reactor 100.

[0032] Understandably, hydrogen peroxide can be added in stages to avoid excessively high local concentrations of hydrogen peroxide leading to self-reaction of hydroxyl radicals.

[0033] The second dosing assembly 500 includes a second dosing pipe and a second dosing pump. One end of the second dosing pipe is connected to the ferrous ion solution via the second dosing pump, and the other end of the second dosing pipe extends to the central region at the top of the reaction zone 120. The second dosing assembly 500 allows the ferrous ion solution to be introduced to the top of the reaction zone 120 of the Fenton oxidation reaction tank 100.

[0034] The effluent assembly 600 includes a Fenton oxidation effluent pipe, one end of which extends to the bottom of the reaction zone 120. The effluent assembly 600 can discharge the wastewater after the Fenton oxidation reaction.

[0035] It should be noted that the Fenton oxidation wastewater treatment device also includes a pH adjustment device, which is used to adjust the pH value in the Fenton oxidation reaction tank 100 and control the pH of the reaction system between 2.5 and 4.0 in order to maintain the activity of ferrous ions and the generation efficiency of hydroxyl radicals.

[0036] On the other hand, this utility model embodiment also provides a wastewater treatment system, including the Fenton oxidation wastewater treatment device as described above, and further including a pretreatment device 700 and a posttreatment device 800, wherein the pretreatment device 700, the Fenton oxidation wastewater treatment device and the posttreatment device 800 are connected in sequence.

[0037] In one embodiment, the pretreatment device 700 includes an iron-carbon reaction tank 710, a pretreatment inlet pipe 720, a pretreatment acid addition pipe 730, and a pretreatment outlet pipe 750. One end of the pretreatment inlet pipe 720 extends to the bottom of the iron-carbon reaction tank 710, and one end of the pretreatment acid addition pipe 730 extends into the iron-carbon reaction tank 710. A packing inlet 740 is provided at the top of the iron-carbon reaction tank 710. One end of the pretreatment outlet pipe 750 is connected to the iron-carbon reaction tank 710, and the other end of the pretreatment outlet pipe 750 is connected to the inlet assembly 300.

[0038] The pretreatment device 700 also includes a reflux pipe 760, a reflux pump 770, and a conical guide plate 780. The reflux pipe 760 is located outside the iron-carbon reaction tank 710 and is equipped with the reflux pump 770. The top end of the reflux pipe 760 extends into the iron-carbon reaction tank 710 and is located above the iron-carbon reaction tank 710. The bottom end of the reflux pipe 760 extends into the iron-carbon reaction tank 710 and is located below the iron-carbon reaction tank 710. The conical guide plate 780 is fixedly installed on the inner bottom wall of the iron-carbon reaction tank 710, and its top has a conical guide surface that gradually expands downward. The bottom end of the reflux pipe 760 extends in a direction tangential to the conical guide surface.

[0039] Iron-carbon powder can be added into the iron-carbon reaction tank 710 through the filler inlet 740. The wastewater reacts with the iron-carbon to achieve iron-carbon micro-electrolysis technology, which significantly improves the biochemical properties of recalcitrant organic compounds such as aromatic compounds, halogenated organics, heterocyclic compounds, dye organics, pesticide organics, and polycyclic aromatic hydrocarbons. Through mechanisms such as chain scission, redox reactions, and toxicity reduction, it converts these compounds into easily degradable small-molecule organics, creating favorable conditions for subsequent biological treatment. This technology is widely used in wastewater pretreatment in industries such as printing and dyeing, pharmaceuticals, chemicals, and pesticides.

[0040] In one embodiment, an openable inspection port can be provided on the side wall of the iron-carbon reaction tank 710 to facilitate subsequent maintenance and repair.

[0041] In one embodiment, the post-treatment device 800 includes a post-treatment tank 810, which includes a degassing chamber 811, a pH adjustment chamber 812, a dosing chamber 813, a flocculation chamber 814, and a sedimentation chamber 815 connected in sequence. The post-treatment tank 810 is connected to the effluent assembly 600.

[0042] It also includes a three-phase separator 820 installed above the sedimentation chamber 815. Meanwhile, the portion of the post-treatment tank 810 above the three-phase separator 820 forms an effluent weir 830 to facilitate the discharge of treated wastewater.

[0043] Compared with existing technologies: Aeration components 200 aerate the Fenton oxidation reactor 100, thereby forming an aeration zone 110 rich in bubbles and flowing upwards. Since the inner diameter of the aeration zone 110 gradually decreases in the vertical direction, a tumble flow can be formed from the aeration zone 110 to the reaction zone 120. The ferrous ion solution and hydrogen peroxide added to the top of the reaction zone 120 by the first dosing component 400 and the second dosing component 500 are rapidly contacted and generated under the impetus of the tumble flow. At the same time, the wastewater introduced by the influent component 300 flows downwards with the help of the tumble flow and mixes thoroughly with the hydroxyl radicals, which can efficiently decompose organic matter in the wastewater. Since the top space of the reaction zone 120 is small, the size of the reaction space can be limited. Finally, the wastewater is discharged from the lower part of the reaction zone 120 through the effluent component 600.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A Fenton oxidation wastewater treatment device, characterized in that, include: Fenton oxidation reactor; An aeration assembly is installed at the bottom of the Fenton oxidation reaction tank and forms a conical aeration zone. The inner diameter of the aeration zone gradually decreases in the vertical upward direction. The part of the Fenton oxidation reaction tank located in the middle of the aeration zone forms a reaction zone. The water inlet assembly extends its outlet end to the top of the reaction zone; The first dosing assembly has a dosing end that extends to the top of the reaction zone; The second dosing assembly has a dosing end that extends to the top of the reaction zone; The water outlet assembly has its inlet end connected to the lower part of the reaction zone.

2. The Fenton oxidation wastewater treatment device according to claim 1, characterized in that, The aeration assembly includes an annular aeration pipe and multiple aeration nozzles. The annular aeration pipe is externally connected to an aerator. The annular aeration pipe is positioned at the bottom edge of the Fenton oxidation reaction tank. The multiple aeration nozzles are evenly arranged around the annular aeration pipe and are all connected to the annular aeration pipe. Furthermore, the multiple aeration nozzles are all inclined upwards in the direction close to the reaction area.

3. The Fenton oxidation wastewater treatment device according to claim 1, characterized in that, The water inlet assembly includes a Fenton oxidation water inlet pipe, one end of which is connected to wastewater, and the other end of which extends to the central region at the top of the reaction zone.

4. The Fenton oxidation wastewater treatment device according to claim 1, characterized in that, The first dosing assembly includes a first dosing tube and a first dosing pump. One end of the first dosing tube is connected to hydrogen peroxide via the first dosing pump, and the other end of the first dosing tube extends to the central region at the top of the reaction zone.

5. The Fenton oxidation wastewater treatment device according to claim 1, characterized in that, The second dosing assembly includes a second dosing tube and a second dosing pump. One end of the second dosing tube is connected to the ferrous ion solution via the second dosing pump, and the other end of the second dosing tube extends to the central region at the top of the reaction zone.

6. The Fenton oxidation wastewater treatment device according to claim 1, characterized in that, The water outlet assembly includes a Fenton oxidation water outlet pipe, one end of which extends to the bottom of the reaction zone.

7. A wastewater treatment system, characterized in that, The device includes the Fenton oxidation wastewater treatment apparatus as described in any one of claims 1-6, and further includes a pretreatment device and a posttreatment device, wherein the pretreatment device, the Fenton oxidation wastewater treatment apparatus, and the posttreatment device are connected in sequence.

8. The wastewater treatment system according to claim 7, characterized in that, The pretreatment device includes an iron-carbon reaction tank, a pretreatment inlet pipe, a pretreatment acid addition pipe, and a pretreatment outlet pipe. One end of the pretreatment inlet pipe extends to the bottom of the iron-carbon reaction tank, and one end of the pretreatment acid addition pipe extends into the iron-carbon reaction tank. A packing inlet is provided at the top of the iron-carbon reaction tank. One end of the pretreatment outlet pipe is connected to the iron-carbon reaction tank, and the other end of the pretreatment outlet pipe is connected to the inlet assembly.

9. The wastewater treatment system according to claim 8, characterized in that, The pretreatment device further includes a reflux pipe, a reflux pump, and a conical guide plate. The reflux pipe is located outside the iron-carbon reaction tank and the reflux pump is installed on this part. The top end of the reflux pipe extends into the iron-carbon reaction tank and is located above the iron-carbon reaction tank. The bottom end of the reflux pipe extends into the iron-carbon reaction tank and is located below the iron-carbon reaction tank. The conical guide plate is fixedly installed on the inner bottom wall of the iron-carbon reaction tank, and its top end forms a conical guide surface that gradually expands downward. The bottom end of the reflux pipe extends in a direction tangential to the conical guide surface.

10. The wastewater treatment system according to claim 7, characterized in that, The post-treatment device includes a post-treatment tank, which contains a degassing chamber, a pH adjustment chamber, a dosing chamber, a flocculation chamber, and a sedimentation chamber that are connected in sequence. The post-treatment tank is connected to the effluent assembly.

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