Membrane Fenton fluidized bed reactor

Abstract

The utility model provides a membrane Fenton fluidized bed reactor which comprises a tank body, a reaction zone and a membrane zone are formed in the tank body from bottom to top, and a carrier is filled in the reaction zone; the three-phase separator is arranged between the reaction area and the membrane area in the tank body; the membrane box is arranged at the membrane area in the tank body and is used for filtering the wastewater; the water inlet module is connected with the lower part of the tank body and is used for introducing the wastewater into the reaction area of the tank body after the wastewater is subjected to acid adjustment; and the water outlet module is connected with the membrane box and is used for leading out the wastewater in the membrane area after passing through the membrane box. According to the utility model, the reaction area is filled with the quartz sand and the quartz sand FeOOH crystal carrier, so that the mass transfer effect is improved, in addition, the iron passing through the three-phase separator flows back to the inlet water through the efficient separation performance of the membrane box, the waste of an iron agent is reduced, and meanwhile, the treatment cost of iron mud is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a membrane Fenton fluidized bed reactor. Background Art

[0002] While industrialization has greatly improved production efficiency, it also generates wastewater that is often hazardous and difficult to treat. To achieve sustainable human development, industrial wastewater must be treated to meet standards before it can be discharged.

[0003] Some industrial wastewater contains a large amount of organic pollutants that are difficult to biodegrade, and biodegradation is the most economical and effective way to treat organic pollutants. In order to improve the biodegradability of wastewater, advanced oxidation processes are often used to decompose large-molecule organic pollutants that are difficult to degrade into small-molecule organic pollutants that are easily biodegradable, which is convenient for subsequent biological treatment. The Fenton oxidation method is a more commonly used advanced oxidation method, which has the advantages of high oxidation efficiency and good economy. The Fenton fluidized bed is an advanced oxidation technology that utilizes the principle of Fenton reaction, combining homogeneous Fenton reaction, heterogeneous Fenton reaction, fluidized bed crystallization and FeOOH reduction and dissolution. It has higher mass transfer efficiency than homogeneous Fenton. However, during the operation of the Fenton fluidized bed, there will be a problem of catalyst loss during the expansion process, which on the one hand causes waste of iron agents, and on the other hand increases the cost of iron sludge treatment. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide a membrane Fenton fluidized bed reactor that can reduce iron agent waste and reduce iron sludge treatment costs.

[0005] The utility model provides the following technical solution: a membrane Fenton fluidized bed reactor, comprising:

[0006] A tank body, wherein a reaction zone and a membrane zone are formed inside the tank body from bottom to top, and the reaction zone is filled with a carrier;

[0007] A three-phase separator is provided between the reaction zone and the membrane zone inside the tank;

[0008] A membrane box is provided at the membrane area inside the tank body and is used for filtering the wastewater;

[0009] A water inlet module is connected to the lower portion of the tank body and is used to introduce the wastewater into the reaction zone of the tank body after acidification;

[0010] The water outlet module is connected to the membrane box and is used to filter the wastewater in the membrane area through the membrane box and then export it.

[0011] Furthermore, the water inlet module includes:

[0012] Acid adjustment tank, used for adjusting the acidity of wastewater;

[0013] A lifting pump, whose input end is connected to the acid adjustment tank through a first water inlet pipe, and whose output end is connected to the lower part of the tank body through a second water inlet pipe, is used to introduce the acid-adjusted wastewater into the reaction zone of the tank body.

[0014] Furthermore, the lower portion of the tank body is conical, and the second water inlet pipe is connected to the middle side of the lower portion of the tank body.

[0015] Furthermore, the water outlet module includes:

[0016] a water production pump, the input end of which is connected to the membrane box through a first water outlet pipe;

[0017] A degassing tank, wherein the output end of the water production pump is connected to the degassing tank through a second water outlet pipe;

[0018] The regulating tank is used to adjust the pH value of the water to neutral before discharging the water.

[0019] Furthermore, the membrane Fenton fluidized bed reactor also includes a reflux module, which includes: a first reflux pipe, a reflux pump and a second reflux pipe. The input end of the reflux pump is connected to the membrane area of ​​the tank body through the first reflux pipe, and the output end of the reflux pump is connected to the second water inlet pipe or the reaction area of ​​the tank body through the second reflux pipe.

[0020] Furthermore, the membrane Fenton fluidized bed reactor also includes an aeration device, which is arranged in the lower part of the reaction zone inside the tank body and is used to provide aeration to the reaction zone.

[0021] Furthermore, the carrier filled in the reaction zone is quartz sand, magnetite, building sand, metal oxide, activated carbon, broken bricks and zeolite.

[0022] The beneficial effects of the utility model are as follows: by filling the reaction zone with quartz sand and quartz sand FeOOH crystal carriers, the mass transfer effect is increased; in addition, through the efficient separation performance of the membrane box, the iron that crosses the three-phase separator is returned to the inlet water, thereby reducing the waste of iron agent and reducing the treatment cost of iron sludge; in addition, the output end of the lifting pump is connected to the tapered lower middle side of the tank body through the second water inlet pipe, so that the wastewater after acid adjustment in the acid adjustment tank enters from the lower middle side of the tank body, and the power of the water inlet forms a flow pattern of middle upflow and peripheral downflow in the tank body, and drives the quartz sand in the tank body to disperse in the water, forming a flow state effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of the present utility model.

[0024] The marks in the accompanying drawings are: 1-tank body, 2-reaction zone, 3-three-phase separator, 4-membrane zone, 5-aeration device, 6-cone, 7-water inlet module, 71-acid adjustment tank, 72-first water inlet pipe, 73-lifting pump, 74-second water inlet pipe, 8-reflux module, 81-first reflux pipe, 82-reflux pump, 83-second reflux pipe, 9-water outlet module, 91-first water outlet pipe, 92-water production pump, 93-second water outlet pipe, 94-degassing tank, 95-regulating tank, 10-membrane box. DETAILED DESCRIPTION

[0025] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The drawings illustrate several embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] First embodiment:

[0029] A membrane Fenton fluidized bed reactor, such as Figure 1 As shown, it includes: a tank body 1, a three-phase separator 3, a membrane box 10, a water inlet module 7 and a water outlet module 9;

[0030] Among them, the tank body 1 is cylindrical, and the lower part of the tank body 1 is conical 6. The reaction zone 2 and the membrane zone 4 are formed from bottom to top inside the body. The reaction zone 2 is filled with a carrier. In this embodiment, the carrier is quartz sand. In other embodiments, the carrier can be magnetite, building sand, metal oxide, activated carbon, broken bricks, zeolite, etc. Quartz sand is used as a solid phase carrier, the expansion rate of quartz sand is 50%, and the rising flow rate in the tank body 1 is controlled at 5m~8m / h; the three-phase separator 3 is arranged between the reaction zone 2 and the membrane zone 4 inside the tank body 1; the membrane box 10 is fixedly connected to the membrane zone 4 inside the tank body 1 through a mounting frame, and is used to filter the wastewater. The membrane box 10 adopts a PVDF hollow fiber membrane or a ceramic membrane prepared by a thermally induced phase separation method, and the membrane frame is made of SUS316L material; the water inlet module 7 is connected to the lower part of the tank body 1, and is used to introduce the wastewater into the reaction zone 2 of the tank body 1 after acidification; further, the water inlet module 7 includes: an acid adjustment tank 71, a lifting pump 73, a first water inlet pipe 72 and a second water inlet pipe 74, the acid adjustment tank 71 is used to adjust the acidity of the wastewater; the lifting pump 73, its input end is connected to the first inlet pipe 74 through the first inlet pipe The water pipe 72 is connected to the acid adjustment tank 71, and the output end is connected to the lower middle side of the cone 6 of the tank body 1 through the second water inlet pipe 74, which is used to introduce the acid-adjusted wastewater into the reaction zone 2 of the tank body 1; the water outlet module 9 is connected to the membrane box 10, and is used to filter the wastewater in the membrane area 4 through the membrane box 10 and then discharge it; further, the water outlet module 9 includes: a water production pump 92, a first water outlet pipe 91, a degassing tank 94, a second water outlet pipe 93 and a regulating tank 95; the water production pump 92, whose input end is connected to the membrane box 10 through the first water outlet pipe 91; the degassing tank 94, the output end of the water production pump 92 is connected to the degassing tank 94 through the second water outlet pipe 93; the regulating tank 95, the water in the degassing tank 94 enters the regulating tank 95 after treatment, and the regulating tank 95 is used to adjust the pH value of the water to neutral before discharging the water.

[0031] Specifically, the reaction process of the reactor of the present invention is as follows: the wastewater is acidified by the acid adjustment tank 71 to make the pH value of the wastewater = 3-4, and then the wastewater after acidification in the acid adjustment tank 71 is introduced into the reaction zone 2 of the tank body 1 through the first water inlet pipe 72 and the second water inlet pipe 74 by the lifting pump 73, and hydrogen peroxide and divalent iron are added simultaneously. Since the lower part of the tank body 1 is conical 6, the wastewater after acidification in the acid adjustment tank 71 enters from the middle side of the lower part of the tank body 1. The power of the water inlet causes the tank body 1 to form a flow state of middle upflow and peripheral downflow, and drives the quartz sand in the tank body 1 to disperse in the water and form a flowing state; the quartz sand in the tank body 1 Sand acts as a carrier for FeOOH crystals. Under the catalytic action of FeOOH, hydrogen peroxide is decomposed to produce OH·. After the mixed liquid in the reaction zone 2 of the tank body 1 rises and passes through the three-phase separator 3, the solid phase matter is intercepted by the three-phase separator 3 and remains in the reaction zone 2 of the tank body 1, continuing to participate in the circulation. The treated water enters the membrane zone 4. The water production pump 92 provides negative pressure suction for the membrane. Under the action of negative pressure, the water passes through the small holes in the membrane and enters the first water outlet pipe 91 and the second water outlet pipe 93, and then enters the degassing tank 94. After being treated in the degassing tank 94, it enters the regulating tank 95. The regulating tank 95 adjusts the pH value of the water to neutral before the water is discharged.

[0032] In summary, by filling the reaction zone 2 with quartz sand and quartz sand FeOOH crystal carriers, the mass transfer effect is increased. In addition, through the efficient separation performance of the membrane box 10, the iron that crosses the three-phase separator 3 is returned to the inlet water, reducing the waste of iron agent and reducing the treatment cost of iron mud. In addition, the output end of the lifting pump 73 is connected to the lower middle side of the cone 6 of the tank body 1 through the second water inlet pipe 74, so that the wastewater after acid adjustment in the acid adjustment tank 71 enters from the lower middle side of the tank body 1. The power of the water inlet causes the tank body 1 to form an upward flow in the middle and downward flow around the flow state, and drives the quartz sand in the tank body 1 to disperse in the water, forming a flow state effect.

[0033] Second embodiment:

[0034] The second embodiment further includes a reflux module 8 based on the membrane Fenton fluidized bed reactor of the first embodiment. The reflux module 8 includes: a first reflux pipe 81, a reflux pump 82 and a second reflux pipe 83. The input end of the reflux pump 82 is connected to the membrane area 4 of the tank body 1 through the first reflux pipe 81, and the output end of the reflux pump 82 is connected to the second water inlet pipe 74 or the reaction zone 2 of the tank body 1 through the second reflux pipe 83.

[0035] It can be understood that by connecting the first reflux pipe 81 to the membrane zone 4 of the tank 1, starting the reflux pump 82 can reflux the detached FeOOH crystals to the reaction zone 2, thereby reducing the catalyst Fe 2+ The reflux ratio of the reflux module 8 is: 100% to 400%.

[0036] Third embodiment:

[0037] The third embodiment is a membrane Fenton fluidized bed reactor according to the second embodiment or the first embodiment, further comprising an aeration device 5 : the aeration device 5 is arranged at the lower part of the reaction zone 2 inside the tank body 1 , and is used to provide aeration to the reaction zone 2 .

[0038] It can be understood that the aeration device 5 includes an aeration pipe provided at the lower part of the tank body 1 and a plurality of aeration plates connected to the aeration pipe. Under the aeration action of the aeration device 5 , the quartz sand in the reaction zone 2 is fluidized in the tank body 1 .

[0039] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0040] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A membrane Fenton fluidized bed reactor, characterized in that include: A tank body, wherein a reaction zone and a membrane zone are formed inside the tank body from bottom to top, and the reaction zone is filled with a carrier; A three-phase separator is provided between the reaction zone and the membrane zone inside the tank; A membrane box is provided at the membrane area inside the tank body and is used for filtering the wastewater; A water inlet module is connected to the lower portion of the tank body and is used to introduce the wastewater into the reaction zone of the tank body after acidification; The water outlet module is connected to the membrane box and is used to filter the wastewater in the membrane area through the membrane box and then export it.

2. The membrane Fenton fluidized bed reactor according to claim 1, characterized in that The water inlet module comprises: Acid adjustment tank, used for adjusting the acidity of wastewater; A lifting pump, whose input end is connected to the acid adjustment tank through a first water inlet pipe, and whose output end is connected to the lower part of the tank body through a second water inlet pipe, is used to introduce the acid-adjusted wastewater into the reaction zone of the tank body.

3. The membrane Fenton fluidized bed reactor according to claim 2, characterized in that The lower portion of the tank body is tapered, and the second water inlet pipe is connected to the middle side of the lower portion of the tank body.

4. The membrane Fenton fluidized bed reactor according to claim 1, characterized in that The water outlet module comprises: a water production pump, the input end of which is connected to the membrane box through a first water outlet pipe; A degassing tank, wherein the output end of the water production pump is connected to the degassing tank through a second water outlet pipe; The regulating tank is used to adjust the pH value of the water to neutral before discharging the water.

5. The membrane Fenton fluidized bed reactor according to claim 2, characterized in that The membrane Fenton fluidized bed reactor also includes a reflux module, which includes: a first reflux pipe, a reflux pump and a second reflux pipe. The input end of the reflux pump is connected to the membrane area of ​​the tank body through the first reflux pipe, and the output end of the reflux pump is connected to the second water inlet pipe or the reaction area of ​​the tank body through the second reflux pipe.

6. The membrane Fenton fluidized bed reactor according to claim 1, characterized in that The membrane Fenton fluidized bed reactor further includes an aeration device, which is arranged at the lower part of the reaction zone inside the tank body and is used to provide aeration to the reaction zone.

7. The membrane Fenton fluidized bed reactor according to claim 1, characterized in that The carrier filled in the reaction zone is quartz sand, magnetite, building sand, metal oxide, activated carbon, broken bricks or zeolite.

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