CN114538596A - Heterogeneous fenton effluent treatment plant - Google Patents
Heterogeneous fenton effluent treatment plant Download PDFInfo
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- CN114538596A CN114538596A CN202210281454.5A CN202210281454A CN114538596A CN 114538596 A CN114538596 A CN 114538596A CN 202210281454 A CN202210281454 A CN 202210281454A CN 114538596 A CN114538596 A CN 114538596A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/1872—Details of the fluidised bed reactor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
- B01J8/34—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with stationary packing material in the fluidised bed, e.g. bricks, wire rings, baffles
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention provides a heterogeneous Fenton wastewater treatment device, which comprises: the reactor comprises a reactor shell, wherein the reactor shell is sequentially divided into a water distribution area, a filling area, a separation area and a clear water area from bottom to top; the first distribution area is provided with a hydrogen peroxide adding port and is connected to the filler area through a pipeline; the second distribution area is provided with a ferrous sulfate feeding port and a wastewater inlet and is connected into the water distribution area through a pipeline; circulating pumps are arranged on the pipelines of the first distribution area and the second distribution area, a bearing plate through which water can flow is arranged between the water distribution area and the filling area, and catalyst filling materials are filled in the filling area; a slag discharge system and a sprayer are arranged above the clear water area. The device can avoid hydroxyl free radical self quenching problem that a large amount of hydrogen peroxide and ferrous sulfate mixed simultaneously and caused, can activate waste water in advance, effectively improves the utilization efficiency of hydrogen peroxide, prevents that dross and froth accumulation from causing the effluent to worsen, ensures the waste water treatment effect.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a heterogeneous Fenton wastewater treatment device.
Background
The heterogeneous Fenton oxidation technology has the same principle as the traditional Fenton reagent oxidation technology, and hydrogen peroxide (H) is added through a catalyst2O2) Catalyzing and decomposing to generate hydroxyl free radical (OH) with strong and non-selective oxidation capability, thereby initiating free radical reaction and degrading organic matters. Heterogeneous Fenton oxidation uses iron-containing solid catalyst to replace dissolved Fe added in traditional Fenton reagent oxidation2+Contaminants in Water and H2O2The molecules diffuse to the active centers on the surface of the solid-phase catalyst and then H2O2OH is generated under the catalytic action of the solid-phase catalyst to oxidize and degrade organic matters. Compared with the traditional Fenton reagent oxidation technology, the heterogeneous Fenton oxidation greatly reduces Fe2+The addition of the catalyst reduces the sludge yield, expands the reaction pH range, and is widely applied to the treatment of wastewater, especially refractory wastewater.
At present heterogeneous fenton oxidation can be divided into two kinds of fluidized bed and fixed bed according to the form that its catalyst exists in the reactor again, and wherein heterogeneous fenton fluidized bed reaction unit has increased the probability of contact with aquatic pollutant and oxidant because of its catalyst is in the state of fluidization in its reactor, has promoted mass transfer efficiency, makes the oxidant distribution more even simultaneously, has higher reaction efficiency. At present, the fluidization of the catalyst is realized by increasing internal circulation through higher ascending flow rate caused by pressurized water flow or adopting an aeration mode. However, the existing heterogeneous Fenton fluidized bed reaction device has more defects, for example, a large amount of scum and scum exists in effluent in the wastewater treatment process, so that the subsequent wastewater treatment effect is influenced; the method has the problems of large usage amount of reaction medicament, low utilization efficiency and the like.
Disclosure of Invention
The invention aims to provide a heterogeneous Fenton wastewater treatment device, which aims to solve the problem of low utilization efficiency of reaction reagents in the prior art, can activate wastewater in advance, avoid the problem of self-quenching of hydroxyl radicals caused by simultaneous mixing of a large amount of hydrogen peroxide and ferrous sulfate, effectively improve the utilization efficiency of hydrogen peroxide and improve the wastewater treatment effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a heterogeneous fenton effluent treatment plant comprising:
the reactor comprises a reactor shell, wherein the reactor shell is sequentially divided into a water distribution area, a filling area, a separation area and a clear water area from bottom to top;
the first distribution area is provided with a hydrogen peroxide adding port and is connected to the filler area through a pipeline;
the second distribution area is provided with a ferrous sulfate feeding port and a wastewater inlet and is connected into the water distribution area through a pipeline;
and circulating pumps are arranged on the pipelines of the first distribution area and the second distribution area, a bearing plate through which water can flow is arranged between the water distribution area and the filling area, and catalyst filling materials are filled in the filling area.
In one embodiment of the present application, perforated water distribution pipes are provided in the water distribution area, and the perforated water distribution pipes are connected to the second distribution area through pipes.
In an embodiment of the present application, a distribution pipe is disposed in the water distribution area, the distribution pipe is connected to the first distribution area through a pipe, a plurality of in-line water distribution pipes are disposed on the distribution pipe, and the plurality of in-line water distribution pipes pass through the supporting plate and enter the filler area.
In an embodiment of the application, a water hole is formed in the supporting plate, the opening position of the water hole is lower than the openings of the in-line water distribution pipes, water distribution caps are arranged on the openings, and the aperture of the water distribution hole on each water distribution cap is smaller than the particle size of the catalyst filler.
In one embodiment of the present application, the first distribution area and the second distribution area are both disposed at an upper portion of the reactor housing and are respectively communicated with the clean water area through distribution area water outlets.
In one embodiment of the present application, distribution area baffles are disposed in each of the first distribution area and the second distribution area, and water permeable openings are disposed at upper portions of the distribution area baffles, and the diameter of the water permeable openings is smaller than the particle size of the catalyst packing.
In an embodiment of the present application, a perforated water collecting pipe is disposed in the clean water zone, and the perforated water collecting pipe is immersed in the clean water zone and is communicated with a water outlet at the upper part of the reactor shell.
In one embodiment of the present application, a baffle is disposed within the separation zone for intercepting catalyst packing that overflows the packing zone.
In one embodiment of the present application, further comprising an extraction system, the extraction system comprising:
the slag scraping paddle is positioned at the upper part of the clear water area;
the motor is positioned at the upper part of the slag scraping paddle and is in driving connection with the slag scraping paddle;
the slag discharging groove is positioned at the lower part of the slag scraping paddle, and an opening of the slag discharging groove is matched with the lower part of the slag scraping paddle and is used for collecting scum;
and the slag discharging port is arranged at one end of the slag discharging groove and is connected to the outer side of the reactor shell.
In an embodiment of the application, still include the sprayer, the sprayer is located keep away from on the row's cinder notch one end department.
Compared with the prior art, the invention has the beneficial effects that:
1. when the catalyst fluidization is carried out by adopting an internal circulation reflux mode in the existing heterogeneous Fenton fluidized bed, hydrogen peroxide and ferrous sulfate required by the reaction are usually added into a water distribution area of a reactor at the same time, a large amount of oxidant enters at one time, a large amount of hydroxyl free radicals (. OH) can be generated in a short time, the hydroxyl free radicals (. OH) can not be completely reacted with main organic matters, and part of the hydroxyl free radicals (. OH) can be quenched by self, so that the problem of low utilization efficiency of the medicament exists. The heterogeneous Fenton wastewater treatment device is provided with two distribution areas, ferrous sulfate and wastewater are mixed in the second distribution area to enable the wastewater to be activated in advance and then enter a water distribution area at the bottom of the reactor shell, and hydrogen peroxide is diluted in the first distribution area and then directly enters a filler area; the waste water activated by ferrous sulfate passes through the supporting plate from the water distribution area at the lower part and enters the filler area to be mixed with hydrogen peroxide for reaction, and by adopting the mixing and water distribution mode, the problem that hydroxyl radicals are quenched due to the simultaneous mixing of a large amount of hydrogen peroxide and ferrous sulfate can be avoided, and the reaction efficiency and the utilization rate of a medicament are improved.
2. The device adopts a fluidized bed form, and forms a higher ascending flow velocity in the reactor by using the reflux water provided by the circulating pump, so that the catalyst in the filler zone is in a fluidized state, and the reaction efficiency is improved; the reflux water is utilized in a reasonable layout, the water consumption is saved, and each functional zone is arranged in the reactor shell along the vertical direction, so that the space and the occupied area are saved.
3. When a catalyst is put into an existing heterogeneous Fenton reactor for the first time or when certain wastewater which possibly generates a large amount of gas, such as wastewater containing sulfides, lipids, surfactants and the like, is treated, a large amount of micro bubbles are generated in the reactor, and the micro bubbles can wrap suspended matters in water and part of fine catalyst to form scum or froth, so that the effluent is deteriorated; if contain a large amount of dross and froth in the play aquatic, can influence flocculation effect at the subsequent pH regulation of reaction, flocculation in-process for wrap up a large amount of microbubbles in the sludge floc that forms, influence the settleability of mud, cause sedimentation tank mud come-up etc. influence waste water treatment effect. This application sets up dross and froth that slag discharging system can be timely, effectual got rid of the reaction in-process and produce on clear water district upper portion, prevents that dross and froth accumulation from causing the effluent to worsen, avoids wrapping up in the play water influence follow-up pH that holds a large amount of dross or bubbles and adjusts, flocculation and sediment, guarantees the waste water treatment effect.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view showing the overall structure of a heterogeneous Fenton wastewater treatment apparatus according to the present invention.
FIG. 2 is a schematic top view of the slag discharging system of the present invention.
FIG. 3 is a schematic structural view of an embodiment of the perforated water distributor according to the present invention.
FIG. 4 is a schematic structural view of another embodiment of the perforated water distributor according to the present invention.
Reference numerals:
1. a reactor shell; 11. a water distribution area; 12. a filler zone; 121. a support plate; 1211. water passing holes; 13. a separation zone; 131. a reflective plate; 14. a clear water zone; 141. perforating a water collecting pipe; 142. a water outlet;
2. a first distribution area; 21. a hydrogen peroxide feeding port; 22. a distribution area water gap; 23. a distribution area baffle; 231. a water permeable port;
3. a second distribution area; 31. a ferrous sulfate feeding port; 32. a wastewater inlet;
4. a circulation pump;
5. perforating a water distribution pipe;
6. a distribution pipe; 61. a water distribution pipe in line; 611. a water distribution cap;
7. a slag scraping paddle; 71. a motor;
8. a slag discharge groove; 81. a slag discharge port;
9. and a sprayer.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate an orientation or positional relationship based on that shown in the drawings, or the orientation or positional relationship conventionally used in the use of the products of the present invention, or the orientation or positional relationship conventionally understood by those skilled in the art, are merely for convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected or detachably connected or integrated; the connection can be mechanical connection, electrical connection or communication; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention provides a heterogeneous fenton wastewater treatment apparatus, including: reactor shell 1, first distribution area 2, second distribution area 3, and a deslagging system, etc.
Wherein, the reactor shell 1 is internally provided with a water distribution area 11, a filling area 12, a separation area 13 and a clear water area 14 from bottom to top in sequence. A bearing plate 121 is arranged between the water distribution area 11 and the packing area 12, the packing area 12 is filled with catalyst packing, the bearing plate 121 is used for supporting the catalyst packing and allowing water to pass through, that is, the water in the water distribution area 11 can pass through the bearing plate 121 and enter the packing area 12.
A first distribution area 2 for the aqueous hydrogen peroxide solution and added to the reactor shell 1. Specifically, a hydrogen peroxide adding port 21 is arranged on the first distribution area 2 and is used for adding medicament hydrogen peroxide; the lower part of the first distribution area 2 is provided with an outlet which is connected to a filler area 12 in the reactor shell 1 through a pipeline, and hydrogen peroxide is directly sent into the filler area 12 for reaction treatment.
The second distribution area 3 is provided with a ferrous sulfate feeding port 31 and a waste water inlet 32 at the upper part, and the outlet at the lower part is connected to the water distribution area 11 in the reactor shell 1 through a pipeline. Ferrous sulfate is mixed with wastewater to be treated in the second distribution area 3 and is sent into the water distribution area 11 through a pipeline, the wastewater to be treated is activated in advance by the ferrous sulfate and then passes through the supporting plate 121 to enter the filler area 12 to be mixed with hydrogen peroxide for reaction, and the problem that a large amount of hydroxyl radicals (OH) are generated in a short time to cause self quenching of the hydroxyl radicals (OH) and reduce the utilization rate of the hydrogen peroxide can be effectively avoided.
All be equipped with circulating pump 4 on the pipeline of first distribution district 2 and 3 exit linkage in second distribution district, circulating pump 4 provides higher rising velocity of flow for rivers and catalyst, ensures that the catalyst is in fluidization state in packing district 12, can improve the contact probability of medicament (hydrogen peroxide solution, ferrous sulfate) and pollutant, improves the utilization ratio of reaction efficiency and medicament.
In one embodiment, perforated water distribution pipes 5 and distribution pipes 6 are provided in the water distribution area 11, and the perforated water distribution pipes 5 are located at the bottom and connected to the circulation pump 4 and the outlets at the lower part of the second distribution area 3 through pipes. As shown in fig. 3, the perforated water distributor 5 may be composed of a straight pipe connected with a plurality of concentric circular pipes; or, as shown in fig. 4, the perforated water distribution pipe 5 is composed of a plurality of straight pipes which are cross-communicated along the radial direction, and a plurality of water outlet small holes are uniformly distributed on the pipe body, so that the wastewater to be treated mixed with ferrous sulfate uniformly disperses into the water distribution area 11.
The distribution pipes 6 are located in the water distribution area 11 and above the perforated water distribution pipes 5. The distribution pipe 6 is connected with the circulating pump 4 and the outlet of the first distribution area 2 through pipelines. A plurality of in-line water distribution pipes 61 are uniformly distributed on the distribution pipe 6, and the in-line water distribution pipes 61 have the same length and vertically penetrate through the supporting plate 121 to extend into the packing area 12. The distribution pipe 6 may be formed by connecting a straight pipe to a plurality of concentric annular pipes, or by connecting a plurality of straight pipes intersecting each other in the radial direction. The distribution pipe 6 is arranged in the water distribution area 11, the in-line water distribution pipe 61 is inserted into the packing area 12 from bottom to top, and the hydrogen peroxide solution is directly dispersed and pumped into the packing area 12, so that the hydrogen peroxide and the ferrous sulfate are uniformly mixed in the packing area and react with pollutants; the distributing pipe 6 is not directly arranged in the filling area 12, so that the influence on the fluidization state of the liquid in the filling area 12 is reduced, and more uniform water distribution and more sufficient contact reaction are ensured.
In one embodiment, the supporting plate 121 is uniformly provided with a plurality of water passing holes 1211, and the water passing holes 1211 and the in-line water distribution pipes 61 are uniformly and alternately arranged. The height of the in-line water distribution pipe 61 is higher than that of the water through hole 1211 (namely, the opening position of the in-line water distribution pipe 61 is higher than that of the water through hole 1211), and the length of the in-line water distribution pipe 61 inserted into the packing area is controlled to be between 2cm and 50cm, preferably to be 30cm, so that the hydrogen peroxide can be better contacted with the catalyst packing, the generated hydroxyl radicals (. OH) are uniformly dispersed, and the generated hydroxyl radicals (. OH) are replaced to be contacted with pollutants in water.
The water through holes 1211 and the in-line water distribution pipes 61 are both provided with a water distribution cap 611, a plurality of water distribution holes are uniformly distributed on the water distribution cap 611, and the aperture of the water distribution holes is smaller than the particle size of the catalyst filler. The catalyst filler is spherical or irregular filler with the particle size of 0.2-8.0 mm. Preferably, the catalyst packing is spherical packing with a diameter of 3.0 mm.
Of course, the support plate 121 may not have water holes, and the support plate 121 may be a sieve plate, and the diameter of the sieve hole is smaller than the particle diameter of the catalyst filler.
In one embodiment, the first distribution area 2 and the second distribution area 3 are arranged at both sides outside the upper part of the reactor housing 1, respectively, or in the fresh water area 14 in the upper part of the reactor housing 1, and communicate with the fresh water area 14 via distribution area water ports 22 in the side walls of the fresh water area 14, respectively. The water flow after the fluidized degradation treatment can flow back to the first distribution area 2 and the second distribution area 3 through the water passing port 22 of the distribution areas, and is mixed with hydrogen peroxide or ferrous sulfate respectively, and pumped to the packing area 12 or the water distribution area 11 through the circulating pump 4. The reflux water can dilute the hydrogen peroxide in the first distribution area 2, so that hydroxyl radical quenching caused by mixing of a large amount of hydrogen peroxide and ferrous sulfate is avoided; the circulating pump 4 utilizes the backflow water to form higher ascending flow velocity in the reactor, ensures that the catalyst in the packing area is in a fluidized state, improves the reaction efficiency, and avoids the introduction of other water flows.
Further, distribution area baffles 23 are arranged in the first distribution area 2 and the second distribution area 3, water permeable openings are arranged at the upper half parts of the distribution area baffles 23, and the pore diameters of the water permeable openings are smaller than the particle diameters of the catalyst filling materials, so that the catalyst filling materials are prevented from entering the first distribution area 2 or the second distribution area 3.
A perforated water collecting pipe 141 is arranged in the clean water area 14, the perforated water collecting pipe 141 is communicated with a water outlet 142 at the upper part of the reactor shell 1, and the perforated water collecting pipe 141 is immersed under the water surface of the clean water area 14 and is used for extracting and discharging the clean water after the catalytic reaction treatment. The position of the water outlet 142 should be higher than the height of the perforated water collecting pipe 141, and the water outlet 142 is preferably arranged 10cm to 80cm above the perforated water collecting pipe 141. The water outlet 142 is preferably disposed at about 50cm above the perforated water collecting pipe 141, so that clean water can be well extracted and discharged, and scum are not easily discharged.
The separation area 13 is provided with a plurality of reflecting plates 131, and the reflecting plates 131 can be inverted V-shaped baffles arranged at intervals and in layers, and are used for intercepting the catalyst filler overflowing the filler area 12 and incompletely preventing floating slag and floating foam from rising, so that the normal operation of the device is ensured.
As shown in fig. 1 and 2, the device further comprises a slag discharging system arranged at the upper part of the reactor shell 1, wherein the slag discharging system comprises a slag scraping paddle 7, a motor 71, a slag discharging groove 8, a slag discharging port 81, a sprayer 9 and the like.
The upper part of the clear water area 14 is provided with a residue scraping paddle 7, the upper part of the residue scraping paddle 7 is in driving connection with a motor 71, a scraping blade is arranged on the lower side of the residue scraping paddle 7, and the scraping blade is adapted to the water surface position of the clear water area 14.
The scum groove 8 is fixedly arranged in the clear water area 14 and is positioned in the middle of the water surface of the clear water area 14, the upper opening of the scum groove corresponds to the lower part of the scum scraping paddle 7, the motor 71 drives the scum scraping paddle 7 to rotate, and scum and froth on the water surface of the clear water area 14 can be hung in the scum groove 8. One end of the slag discharging groove 8 is provided with a slag discharging port 81, the slag discharging port 81 is connected to the outer side of the reactor shell 1, and scum and floating foam collected by the slag discharging groove 8 are discharged through the slag discharging port 81.
Further, the slag discharging system further comprises a sprayer 9, and a spray head of the sprayer 9 is arranged in an opening on the upper side of the slag discharging groove 8 and is positioned at one end of the slag discharging groove 8, which is far away from the slag discharging port 81. The scum scraping paddle 7 rotates to scrape scum and floating foam on the water surface of the clean water area 14 into the scum discharging groove 8, water flow is sprayed by the sprayer 9, and the scum and the floating foam are timely flushed to the scum discharging port 81 and discharged out of the reactor shell 1. Avoiding scum and froth accumulation to cause the effluent to worsen, reducing the scum or bubble amount that the effluent wraps up in, guaranteeing the treatment effect of follow-up pH regulation, flocculation and settlement process, guaranteeing the waste water treatment quality.
Adopt this heterogeneous fenton effluent treatment plant to handle waste water, including the following step:
the wastewater to be treated enters the second distribution area 3 from the wastewater inlet 32, is mixed with the return water in the clean water area 14 and the ferrous sulfate added from the ferrous sulfate adding port 31, and the mixed and activated wastewater enters the water distribution area 2 of the reactor shell 1 from the perforated water distribution pipe 5 through the corresponding circulating pump 4 and uniformly enters the packing area 12 through the water through holes 1211 on the bearing plate 121.
Meanwhile, the return water in the clear water zone 14 enters the first distribution zone 2, is mixed with the hydrogen peroxide added from the hydrogen peroxide adding port 21, and enters the filling zone 12 through the corresponding circulating pump 4 via the distribution pipe 6 and the in-line water distribution pipe 61; the water enters the filler area 12 through the water holes 1211 of the supporting plate 121 and reacts with heterogeneous catalyst fillers in the filler area 12 to carry out catalytic oxidation reaction, so that pollutants in the water are degraded.
The reacted wastewater enters the separation area 13, and a small amount of catalyst filler doped in the wastewater is intercepted by the reflecting plate 131 in the separation area 13 and falls back into the filler area 12; the wastewater passes through the separation zone 13 into the upper clean water zone 14 and then exits the reactor shell 1 through the outlet 142 by submerging the perforated header 141 disposed in the clean water zone 14.
Scum and scum existing in the clean water area 14 are gradually gathered on the upper layer of the water surface due to the light specific gravity, and the scum are hung in the slag discharging groove 8 by the rotating slag scraping paddle 7 and are flushed out by flushing liquid sprayed out by the sprayer 13 through the slag discharging port 81.
In conclusion, the heterogeneous Fenton wastewater treatment device adopts a fluidized bed mode, and forms a higher ascending flow velocity in the reactor shell 1 by using the return water provided by the circulating pump 4, so that the catalyst in the filler zone 12 is in a fluidized state, and the reaction efficiency is improved; each functional area is arranged in the reactor shell 1 along the vertical direction, so that the occupied area is saved;
the first distribution area 2 and the second distribution area 3 are arranged, so that the ferrous sulfate and the hydrogen peroxide are respectively mixed with the return water, and the wastewater and the ferrous sulfate are mixed in the second distribution area 3, so that the wastewater to be treated is activated in advance. The return water mixed with the raw water and the ferrous sulfate enters the water distribution area 11 through the perforated water distribution pipe 5, and then uniformly enters the filling area 12 through the water passing holes 1211 of the supporting plate 121. The return water mixed with the hydrogen peroxide directly enters the packing region 12 through the in-line water distribution pipe 61. By adopting the mixing and water distribution mode, the problem of hydroxyl free radical self-quenching caused by simultaneously mixing a large amount of hydrogen peroxide and ferrous sulfate is avoided, so that the device has uniform water distribution, full reaction and high medicament utilization rate.
Claims (10)
1. A heterogeneous Fenton effluent treatment plant, its characterized in that includes:
the reactor comprises a reactor shell, wherein the reactor shell is sequentially divided into a water distribution area, a filling area, a separation area and a clear water area from bottom to top;
the first distribution area is provided with a hydrogen peroxide adding port and is connected to the filler area through a pipeline;
the second distribution area is provided with a ferrous sulfate feeding port and a wastewater inlet and is connected into the water distribution area through a pipeline;
and circulating pumps are arranged on the pipelines of the first distribution area and the second distribution area, a bearing plate through which water can flow is arranged between the water distribution area and the filling area, and catalyst filling materials are filled in the filling area.
2. A device for treating waste water according to claim 1, wherein a perforated water distributor is provided in said water distribution area, said perforated water distributor being connected to said second distribution area via a pipe.
3. The heterogeneous Fenton's waste water treatment plant of claim 1 or 2, wherein a distribution pipe is arranged in the distribution area, the distribution pipe is connected with the first distribution area through a pipeline, a plurality of in-line water distribution pipes are arranged on the distribution pipe, and the plurality of in-line water distribution pipes pass through the support plate and enter the packing area.
4. The heterogeneous Fenton's waste water treatment plant of claim 3, wherein the support plate is provided with water holes, the openings of the water holes are lower than the openings of the in-line water distribution pipes, and the openings are provided with water distribution caps, and the aperture of the water distribution holes on the water distribution caps is smaller than the particle size of the catalyst filler.
5. The heterogeneous Fenton's wastewater treatment plant of claim 1, wherein the first distribution area and the second distribution area are both located at an upper portion of the reactor housing and are in communication with the clean water area through distribution area inlets, respectively.
6. The heterogeneous Fenton's wastewater treatment plant according to claim 5, wherein distribution zone baffles are provided in both the first distribution zone and the second distribution zone, and wherein water permeable openings are provided in the upper portion of the distribution zone baffles, and wherein the diameter of the water permeable openings is smaller than the particle size of the catalyst packing.
7. The heterogeneous Fenton's wastewater treatment plant of claim 1, wherein a perforated header is provided in the clean water zone, the perforated header being submerged in the clean water zone and communicating with a water outlet in an upper portion of the reactor housing.
8. The heterogeneous Fenton's wastewater treatment plant of claim 1, wherein a baffle is provided in the separation zone to intercept catalyst packing that overflows the packing zone.
9. The heterogeneous Fenton's wastewater treatment plant of claim 1, further comprising an extraction system, the extraction system comprising:
the slag scraping paddle is positioned at the upper part of the clear water area;
the motor is positioned at the upper part of the slag scraping paddle and is in driving connection with the slag scraping paddle;
the slag discharging groove is positioned at the lower part of the slag scraping paddle, and an opening of the slag discharging groove is matched with the lower part of the slag scraping paddle and is used for collecting scum;
and the slag discharging port is arranged at one end of the slag discharging groove and is connected to the outer side of the reactor shell.
10. The heterogeneous Fenton's wastewater treatment plant of claim 9, further comprising a sprayer located at an end of the slag chute distal from the slag discharge port.
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