CN214990889U

CN214990889U - Reactor with low sludge yield based on multidimensional catalytic oxidation process

Info

Publication number: CN214990889U
Application number: CN202121183306.7U
Authority: CN
Inventors: 傅继达; 张文成; 熊仿鹏; 张丞洋
Original assignee: Hangzhou Lyuxia Environment Technology Co ltd
Current assignee: Hangzhou Lyuxia Environment Technology Co ltd
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2021-12-03
Anticipated expiration: 2031-05-28

Abstract

The application relates to the technical field of wastewater treatment, in particular to a reactor with low sludge yield based on a multidimensional catalytic oxidation process. The reactor comprises a tank body, wherein a catalyst bed is arranged in the tank body, the inner cavity of the tank body is divided into a water inlet area below the catalyst bed and a water outlet area above the catalyst bed by the catalyst bed, the catalyst bed is used for filling a catalyst containing Fe3O4/TiO2 composite nanoparticles, the water inlet area is connected with a water inlet pipe and a dosing device, the bottom of the water inlet area is provided with an aeration device, the water outlet area is connected with a water outlet pipe, and an ultraviolet lamp is further arranged in the inner cavity. The application can improve the utilization ratio of the Fenton reagent, further improve the degradation rate of organic pollutants and reduce the sludge yield.

Description

Reactor with low sludge yield based on multidimensional catalytic oxidation process

Technical Field

The application relates to the technical field of wastewater treatment, in particular to a reactor with low sludge yield based on a multidimensional catalytic oxidation process.

Background

In the wastewater treatment, the Fenton method is a commonly used process for removing organic pollutants in wastewater, and the essence of the Fenton method is that Fe2+ catalyzes hydrogen peroxide to generate hydroxyl radicals, so that the strong oxidizing capability of the hydroxyl radicals is utilized to degrade macromolecular organic matters, and the indexes of COD (chemical oxygen demand), chromaticity and the like of the wastewater are effectively reduced.

The utility model discloses a compound catalytic oxidation reactor of multidimension is disclosed in chinese utility model patent that bulletin number is CN205151915U, including a jar body and inlet tube and the outlet pipe of setting on the jar body, set up the baffle in the middle of the jar body and divide into the treatment area one that has filler district one and the treatment area two that has filler district two with the jar body, the top seal of baffle upper end and jar body, the lower extreme of baffle and jar body bottom are left and are supplied sewage to get into the passageway of treatment area two from treatment area one, and the internal trachea that leads to of being close to bottom department of jar, jar body top is provided with gas vent and medicine channel, and inlet tube and outlet pipe set up respectively on treatment area one and treatment area two and all are located the upper end of the jar body.

In the above-mentioned correlation technique, can add fenton's reagent through the dosing pipe as required to the organic matter in the degradation waste water. However, in the fenton reaction, Fe2+ and Fe3+ can be mutually converted, so that the catalyst can be recycled, and the dosage of ferrous ions is reduced. However, during the reaction, the conversion rate of Fe3+ to Fe2+ is low, and Fe2+ and Fe3+ easily react with OH-to generate precipitates, so that the mutual conversion of Fe2+ and Fe3+ is inhibited, and the degradation effect is reduced. Therefore, the Fenton method is adopted to treat the wastewater, and ferrous ions need to be supplemented continuously, so that on one hand, the operation cost is increased; on the other hand, the amount of sludge is large, and the cleaning difficulty is increased.

SUMMERY OF THE UTILITY MODEL

In order to improve the utilization rate of Fenton's reagent and reduce the sludge yield, the application provides a reactor with low sludge yield based on a multidimensional catalytic oxidation process.

The reactor with low sludge yield based on the multidimensional catalytic oxidation process adopts the following technical scheme:

the reactor with low sludge yield based on the multidimensional catalytic oxidation process comprises a tank body, wherein a catalyst bed is arranged in the tank body, the inner cavity of the tank body is divided into a water inlet area positioned below the catalyst bed and a water outlet area positioned above the catalyst bed by the catalyst bed, the catalyst bed is used for filling a catalyst containing Fe3O4/TiO2 composite nanoparticles, the water inlet area is connected with a water inlet pipe and a dosing device, the bottom of the water inlet area is provided with an aeration device, the water outlet area is connected with a water outlet pipe, and an ultraviolet lamp is further arranged in the inner cavity.

Through adopting above-mentioned technical scheme, waste water gets into water district from the inlet tube, and the district is advanced into water in the Fenton reagent passes through charge device and adds, degrades the organic matter in the hydroxyl free radical to the waste water through the mixed production of Fenton reagent to reduce the COD value of waste water.

Under the action of an aeration device and water pressure, wastewater flows upwards, and when the wastewater passes through the catalyst bed, because the Fe3O4/TiO2 composite nano particles in the catalyst bed contain TiO2 components with better ultraviolet light absorption capacity, electrons are generated after ultraviolet light irradiation. The Fe3O4 component not only has the function of enhancing the ultraviolet absorption capacity, but also promotes the generation of electrons; the principle is that Fe3+ is used as an electron acceptor under ultraviolet irradiation, and receives electrons generated by electron TiO2, so that the electrons are converted into Fe2+, the mutual conversion rate of Fe2+ and Fe3+ in Fenton reaction is effectively improved, the degradation efficiency of organic pollutants is further improved, the addition amount of ferrous ions is reduced, the operation cost is effectively reduced, and the sludge yield is reduced.

Preferably, the catalyst bed is made of a porous ceramic plate, and the catalyst bed includes at least one porous ceramic plate, and the catalyst is filled in the pores of the porous ceramic plate.

Through adopting above-mentioned technical scheme, the catalyst bed is made by porous ceramic plate, and porous ceramic plate has porous structure, has both been favorable to the packing of catalyst, is favorable to the infiltration of waste water again, and waste water can fully contact with the catalyst in the infiltration process to improve the degradation efficiency to organic pollutant.

Preferably, the catalyst bed is provided in plurality along the vertical direction of the tank body.

By adopting the technical scheme, the multiple catalyst beds are beneficial to improving the reaction time of the wastewater, the Fenton reagent and the catalyst so as to promote the generation of hydroxyl radicals, improve the degradation efficiency and reduce the sludge yield.

Preferably, the pore diameters of the porous ceramic plates of the catalyst beds are different, the pore diameters of the porous ceramic plates of the catalyst beds are reduced from bottom to top, and the inner diameter of the pore passage of the porous ceramic plate of the catalyst bed close to the water outlet area is smaller than the inner diameter of the pore passage of the porous ceramic plate of the catalyst bed close to the water inlet area.

By adopting the technical scheme, the wastewater flows from bottom to top in the reactor, and the aperture of the catalyst bed is gradually reduced along the flowing direction of the wastewater, so that the penetration depth of the wastewater in the catalyst bed is increased, the contact time and the contact area of the wastewater and the catalyst are improved, and the degradation effect on organic matters is improved.

Preferably, the tank body is externally provided with a backflow component, and the backflow component comprises a backflow pipe communicated between the water inlet area and the water outlet area, a water pump connected to the backflow pipe, and a regulating valve arranged on the backflow pipe.

By adopting the technical scheme, the water containing ferrous ions in the water outlet area flows back to the water inlet area by utilizing the return pipe, so that the residual ferrous ions continuously participate in the catalytic degradation reaction, the generation of hydroxyl radicals is promoted, the degradation rate is improved, and the COD value is reduced. Meanwhile, the dosage of ferrous ions is reduced, so that the sludge yield is reduced.

Preferably, the return pipe is connected with a venturi tube in parallel, and two ends of the venturi tube are respectively located at two ends of the regulating valve; the dosing device comprises a liquid medicine tank and a dosing pipe, and two ends of the dosing pipe are respectively communicated with the inner cavity of the liquid medicine tank and the necking part of the Venturi tube.

By adopting the technical scheme, the Venturi tube is a pipeline with a Venturi effect, when water flows at the position of the reduced port of the pipeline, the flow velocity of the water flow is increased according to the Bernoulli equation, and a low-pressure area is generated at the position of the dosing pipe communicated with the reduced port. In this application, when adjusting first adjusting valve, when reducing the waste water flow in the first circulating pipe, will make waste water flow through from first venturi to produce a low pressure region in first venturi, make the interior fenton's reagent of liquid medicine jar inhale under the effect of atmospheric pressure, and mix and flow back to the district of intaking in the backward flow waste water.

Preferably, the backflow assemblies are provided in two groups.

By adopting the technical scheme, if the ferrous sulfate and the hydrogen peroxide are added simultaneously, the hydrogen peroxide instantaneously reacts with a large amount of ferrous iron in a limited space, and a large amount of hydrogen peroxide is consumed by energy generated in the reaction process. Adopt two sets of backward flow subassemblies in this scheme, can add ferrous sulfate and hydrogen peroxide solution respectively into the district of intaking, can effectively reduce the loss of fenton's medicament, reduce the medicament use amount to be favorable to reducing the output of indisputable mud.

To sum up, the application comprises the following beneficial technical effects:

through filling the compound nanoparticle of Fe3O4 TiO2 that has the ultraviolet absorption effect in the catalyst bed in this application to set up the ultraviolet lamp, improved the utilization ratio of high fenton's reagent effectively, reduced mud output.

According to the method, the catalyst bed made of the porous ceramic plates with different pore diameters is arranged, so that the generation of hydroxyl radicals is further promoted, and the sludge yield is reduced.

Through setting up the backward flow subassembly in this application, improved the utilization ratio to the ferrous ion in the fenton's reagent to organic matter degradation rate has been improved.

Drawings

FIG. 1 is a schematic diagram showing the overall structure of a reactor for low sludge yield based on a multi-dimensional catalytic oxidation process in the present embodiment;

fig. 2 is a sectional view of the reactor of the present example based on a low sludge yield of the multidimensional catalytic oxidation process.

In the figure, 1, a tank body; 2. a catalyst bed; 21. a porous ceramic plate; 3. a water inlet area; 31. a water inlet pipe; 4. a water outlet area; 4. a water outlet pipe; 5. a dosing device; 51. a medicine feeding pipe; 6. an aeration device; 7. an ultraviolet lamp; 8. a reflow assembly; 81. a return pipe; 82. a water pump; 83. adjusting a valve; 84. a venturi tube.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

The embodiment of the application discloses a reactor with low sludge yield based on a multidimensional catalytic oxidation process. Referring to fig. 1 and 2, the reactor comprises a tank body 1, a catalyst bed 2 is arranged in the middle of the tank body 1, the catalyst bed 2 divides an inner cavity of the tank body 1 into an upper part and a lower part, a water inlet area 3 is arranged below the catalyst bed 2, a water outlet area 4 is arranged below the catalyst bed 2, the catalyst bed 2 is used for filling a catalyst containing Fe3O4/TiO2 composite nanoparticles, and the water inlet area 3 is communicated with a water inlet pipe 31 and a dosing device 5; the bottom of the water inlet area 3 is provided with an aeration device 6. The water outlet area 4 is connected with a water outlet pipe 41, and an ultraviolet lamp 7 is also arranged in the inner cavity.

Referring to fig. 1 and 2, wastewater enters a water inlet area 3 from a water inlet pipe 31, a Fenton reagent is added into the water inlet area 3 through a dosing device 5, Fe2+ in the Fenton reagent catalyzes hydrogen peroxide to generate hydroxyl radicals, and the strong oxidizing ability of the hydroxyl radicals is utilized to degrade macromolecular organic matters, so that indexes such as COD (chemical oxygen demand) and chromaticity of the wastewater are effectively reduced. Under the action of the aeration device 6 and water pressure, wastewater degraded by the Fenton reagent flows upwards and passes through the catalyst bed 2, and Fe3O4/TiO2 composite nano particles in the catalyst bed 2 can absorb ultraviolet light and generate electrons, so that the mutual conversion of Fe2+ and Fe3+ is promoted, the utilization rate of the reagent is improved, and the effect of reducing the yield of iron sludge is achieved.

Referring to fig. 2, the catalyst bed 2 is made of at least one porous ceramic plate 21, and in this embodiment, the catalyst bed 2 is a circular porous ceramic plate 21, and its circumferential side wall abuts against the inner wall of the tank 1. The porous ceramic plate 21 has a porous structure, and its channels are used for filling the catalyst.

Referring to fig. 2, a plurality of catalyst beds 2 are arranged in a vertical direction, and the inner diameters of the pore passages of the porous ceramic plates 21 of the plurality of catalyst beds 2 are sequentially reduced from bottom to top; i.e., the inner diameter of the channels of the porous ceramic plate 21 of the catalyst bed 2 near the water inlet zone 3 is smaller than the inner diameter of the channels of the porous ceramic plate 21 of the catalyst bed 2 near the water outlet zone 4.

Referring to fig. 1 and 2, two sets of backflow assemblies 8 are disposed outside the tank 1, and each backflow assembly 8 includes a backflow pipe 81, a water pump 82 and a regulating valve 83. The return pipe 81 is communicated between the upper end of the water outlet area 4 and the lower end of the water inlet area 3; the water pump 82 is connected to the return pipe 81 and is used for pumping and returning the wastewater in the water outlet area 4 to the water inlet area 3; a regulating valve 83 is provided on the return pipe 81 to. The return pipe 81 is connected in parallel with a venturi 84, both ends of the venturi 84 are connected to the return pipe 81, and both ends of the venturi 84 are respectively located at both ends of the regulating valve 83.

Referring to fig. 1 and 2, the dosing device 5 includes a liquid medicine tank (not shown in the figure) and a dosing tube 51, the liquid medicine tank is used for storing fenton reagent, one end of the dosing tube 51 is communicated with the inner cavity of the liquid medicine tank, and the other end is communicated with the throat of the venturi tube 84.

The implementation principle of the reactor with low sludge yield based on the multidimensional catalytic oxidation process in the embodiment of the application is as follows:

1. wastewater enters a water inlet area 3 through a wastewater inlet pipe 31, a Fenton reagent enters the water inlet area 3 through a dosing device 5, and organic pollutants in the wastewater are degraded by hydroxyl radicals generated by the Fenton reagent; then the wastewater passes through the catalyst bed 2, and the Fe3O4/TiO2 composite nano particles in the catalyst bed 2 absorb ultraviolet light to promote the conversion of Fe2+ and Fe3+, thereby generating more hydroxyl radicals and further degrading organic matters in the wastewater. Finally, the wastewater enters the water outlet zone 4 and enters the next treatment process from the water outlet pipe 41.

2. Under the suction of the water pump 82, part of wastewater at the upper end of the water outlet area 4 flows back to the lower end of the water inlet area 3 from the return pipe 81, so that residual ferrous ions in the returned wastewater participate in the catalytic reaction again, the utilization rate of the Fenton reagent is fully improved, and the sludge yield is reduced. During the process of wastewater backflow, when the flow of the backflow pipe 81 is reduced through the regulating valve 83, the wastewater enters the venturi tube 84, and when the wastewater flows through the necking position where the dosing pipe 51 is located, a low-pressure area is generated in the dosing pipe 51, so that the medicament is sucked into the backflow pipe 81 from the liquid medicine tank and enters the water inlet area 3 along with the wastewater.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. Reactor of low mud productivity based on multidimension catalytic oxidation technology, including jar body (1), its characterized in that: be provided with catalyst bed (2) in jar body (1), catalyst bed (2) separate jar body (1) inner chamber for being located the district (3) of intaking of catalyst bed (2) below and being located play water zone (4) of catalyst bed (2) top, catalyst bed (2) are used for filling the catalyst that contains the compound nanoparticle of Fe3O4/TiO2, it is connected with inlet tube (31) and charge device (5) to intake district (3), it is provided with aeration equipment (6) to intake district (3) bottom, it is connected with outlet pipe (41) to go out water zone (4), still be provided with ultraviolet lamp (7) in the inner chamber.

2. The reactor of claim 1 for low sludge yield based on multi-dimensional catalytic oxidation process, characterized in that: the catalyst bed (2) is made of a porous ceramic plate (21), and the catalyst bed (2) comprises at least one porous ceramic plate (21), and the catalyst is filled in the pores of the porous ceramic plate (21).

3. The reactor of claim 2 for low sludge yield based on multi-dimensional catalytic oxidation process, characterized in that: the catalyst bed (2) is provided with a plurality of catalyst beds along the vertical direction of the tank body (1).

4. The reactor of claim 3 for low sludge yield based on multi-dimensional catalytic oxidation process, characterized in that: the pore diameters of the porous ceramic plates (21) of the catalyst beds (2) are sequentially reduced from bottom to top, and the inner diameter of the pore passage of the porous ceramic plate (21) of the catalyst bed (2) close to the water outlet area (4) is smaller than that of the pore passage of the porous ceramic plate (21) of the catalyst bed (2) close to the water inlet area (3).

5. The reactor of claim 1 for low sludge yield based on multi-dimensional catalytic oxidation process, characterized in that: the utility model discloses a water tank, including jar body (1) outside be provided with backward flow subassembly (8), backward flow subassembly (8) including communicate in intake district (3) and play water area (4) between back flow (81), connect water pump (82) on back flow (81), set up governing valve (83) on back flow (81).

6. The reactor of claim 5 for low sludge yield based on multi-dimensional catalytic oxidation process, characterized in that: the return pipe (81) is connected with a Venturi tube (84) in parallel, and two ends of the Venturi tube (84) are respectively positioned at two ends of the regulating valve (83); the medicine adding device (5) comprises a liquid medicine tank (51) and a medicine adding pipe (52), and two ends of the medicine adding pipe (52) are respectively communicated with the inner cavity of the liquid medicine tank (51) and the necking part of the Venturi tube (84).

7. The reactor of claim 6, characterized in that it comprises: the backflow component (8) is provided with two groups.