Sewage treatment device based on ferrate oxidation technology

Abstract

The utility model relates to a sewage treatment device based on a ferrate oxidation technology, which belongs to the field of sewage treatment and comprises a sewage delivery pump, a potassium ferrate storage tank, a boric acid storage tank, a ferrate storage tank and a fixed bed reactor, the potassium ferrate storage tank and the boric acid storage tank are respectively communicated with the ferrate storage tank through pipelines; the ferrate storage tank is connected to the lower end of the fixed bed reactor through a delivery pump and a pipeline; the sewage delivery pump is communicated to the lower end of the fixed bed reactor through a pipeline; a cerium dioxide modified activated carbon filler layer is arranged in the fixed bed reactor; a water outlet pipe is arranged at the top of the fixed-bed reactor; according to the device disclosed by the utility model, cerium dioxide and ferrate can form a heterogeneous system in a solid state, so that Fe (VI) is gradually reduced into Fe (V) / Fe (IV), Fe (IV) / Fe (V) is stably generated, the self-decomposition rate of Fe (IV) / Fe (V) is slowed down, the effective utilization rate of Fe (VI) is improved, new organic pollutants in sewage are continuously and effectively removed, and the sewage purification efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the field of sewage treatment, and specifically relates to a sewage treatment device based on ferrate oxidation technology. Background Art

[0002] In recent years, with the widespread use of personal care products, antibiotics and other drugs, a large number of synthetic chemicals have been released into the water environment. Their environmental behavior, toxicological effects and control treatment have become research hotspots in the fields of medicine, environmental science, toxicology, etc. Since traditional sewage treatment processes have limited effects on the treatment of emerging organic pollutants in water, the development of fast, effective and economical treatment methods has become a key topic in the field of environmental engineering. Ferrate (FeO42-, Fe(VI)) is a green water treatment agent with multiple functions such as oxidation, adsorption, flocculation, sterilization and disinfection. The strong oxidizing property of Fe(VI) enables it to remove a variety of organic pollutants that are not easily degradable in water. It also has sterilization and algae removal functions, and its reduction product, new ecological iron hydroxide, has strong flocculation and adsorption effects. Fe(VI) has a relatively prominent advantage in oxidative removal of emerging organic pollutants in water. A large part of the emerging pollutants contain unsaturated functional groups (phenolic hydroxyl, aromatic amine and C=C double bonds) that are easily destroyed by Fe(VI), and these functional groups are often the active centers of the biological effects of these organic substances. However, the stability of Fe(VI) itself and its oxidation selectivity lead to incomplete removal of organic pollutants. Exploring the reaction mechanism of Fe(VI) oxidation of pollutants and strengthening its oxidation process is a research hotspot of Fe(VI) oxidation technology. Although traditional enhancement methods such as ozone and photocatalysis can enhance the oxidation effect of Fe(VI) to a certain extent, they still cannot effectively oxidize organic pollutants that are difficult for Fe(VI) to oxidize. Studies have shown that the reaction rate constant of Fe(V) / Fe(IV) oxidation of organic matter is 2 to 6 orders of magnitude higher than that of Fe(VI), and Fe(V) / Fe(IV) can degrade pollutants that Fe(VI) cannot degrade. Therefore, if the production of Fe(V) / Fe(IV) can be quickly induced in the process of Fe(VI) oxidation of organic pollutants and Fe(V) / Fe(IV) can be effectively used to oxidize and remove organic pollutants in water, it can not only greatly improve the rate of Fe(VI) oxidation of organic pollutants, but also have the potential to degrade organic pollutants that are difficult for Fe(VI) to oxidize.

[0003] In a homogeneous system, a reducing agent is added to convert Fe(VI) into highly active Fe(IV) / Fe(V). The higher the concentration of the activator, the faster the rate of Fe(IV) / Fe(V) production and the more intense the self-decomposition of Fe(IV) / Fe(V). However, the presence of excess reducing agent will compete with the production of Fe(IV) / Fe(V), thereby reducing the activation effect. For example, when H2O2 activates Fe(VI), excess H2O2 will compete with Fe(IV) / Fe(V).

[0004] Therefore, it is necessary to develop a safe technology that can slow down the conversion rate of Fe(VI) to highly active Fe(IV) / Fe(V), avoid the violent self-decomposition of Fe(IV) / Fe(V), achieve the smooth generation of Fe(IV) / Fe(V), and then realize the continuous and stable oxidation of pollutants in sewage. Utility Model Content

[0005] In order to overcome the problems existing in the background technology, the utility model provides a sewage treatment device based on ferrate oxidation technology, which can realize that cerium dioxide with reducing properties forms a heterogeneous system with ferrate in solid form, so that Fe(VI) is gradually reduced to Fe(V) / Fe(IV), and Fe(IV) is generated smoothly, the self-decomposition rate of Fe(IV) / Fe(V) is slowed down, the effective utilization rate of Fe(VI) is improved, the emerging organic pollutants in sewage are continuously and effectively removed, and the purification efficiency of sewage is improved.

[0006] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] The sewage treatment device based on ferrate oxidation technology comprises a sewage delivery pump, a potassium ferrate storage tank, a boric acid storage tank, a ferrate reserve tank and a fixed bed reactor;

[0008] The potassium ferrate storage tank and the boric acid storage tank are connected to the ferrate reserve tank through pipelines, and flow meters are provided on the connecting pipelines;

[0009] The ferrate reserve tank is connected to the lower end of the fixed bed reactor via a delivery pump and a pipeline, and the sewage delivery pump is connected to the lower end of the fixed bed reactor via a pipeline;

[0010] The fixed bed reactor is filled with a cerium dioxide modified activated carbon filler layer; a water outlet pipe is provided on the top of the fixed bed reactor;

[0011] The outlet pipes of the delivery pump of the ferrate storage tank and the sewage delivery pump are respectively provided with flow meters.

[0012] Preferably, the cerium dioxide modified activated carbon filler layer is arranged in the middle of the fixed bed reactor, and filter filler layers are respectively loaded at both ends of the fixed bed reactor, and a partition is provided between the cerium dioxide modified activated carbon filler layer and the filter filler layer.

[0013] Preferably, the filter filler layer is filled with a mixed filler of glass beads and quartz.

[0014] Preferably, a buffer chamber is provided at the lower end of the fixed bed reactor, and a partition net is provided between the buffer chamber and the packing layer.

[0015] Preferably, a buffer chamber is provided at the upper end of the fixed bed reactor, and a partition net is provided between the buffer chamber and the packing layer.

[0016] Preferably, the boric acid storage tank is made of a light-proof material.

[0017] Preferably, a premixing tube is provided between the outlet pipes of the delivery pump and the sewage delivery pump of the ferrate storage tank and the fixed bed reactor; the outlet pipes of the delivery pump and the sewage delivery pump of the ferrate storage tank are respectively connected to the premixing tube, and the premixing tube is connected to the bottom end of the fixed bed reactor.

[0018] Beneficial effects of the utility model:

[0019] The utility model arranges a cerium dioxide modified activated carbon filler layer in a fixed bed reactor, so that the cerium dioxide with reducing performance contacts with the ferrate heterogeneous phase in a solid form, so that Fe(VI) is gradually reduced to Fe(V) / Fe(IV), and the stable generation of Fe(IV) / Fe(V) is achieved, the self-decomposition rate of Fe(IV) / Fe(V) is slowed down, the effective utilization rate of Fe(VI) is improved, the emerging organic pollutants in sewage are continuously and effectively removed, and the purification efficiency of sewage is improved.

[0020] The utility model can effectively filter solid impurities in sewage by arranging filtering filling layers at both ends of the cerium dioxide modified activated carbon filling layer, avoid or reduce the adhesion of solid phase matter in sewage to the cerium dioxide modified activated carbon, and reduce the influence of solid phase matter on the oxidation removal efficiency of organic matter.

[0021] The utility model can realize the intermittent configuration of potassium ferrate-boric acid buffer solution by arranging the potassium ferrate storage tank and the boric acid storage tank, thereby avoiding the photodecomposition of the configured ferrate reserve solution.

[0022] The utility model arranges a premixing tube so that ferrate can be mixed with sewage before entering the fixed bed reactor, so that Fe(VI) is dispersed in the sewage and then contacts with cerium dioxide modified activated carbon, thereby improving the oxidative removal efficiency of organic matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] In the figure, 1-sewage delivery pump, 2-potassium ferrate storage tank, 3-boric acid storage tank, 4-ferrate reserve tank, 5-fixed bed reactor, 6-flow meter, 7-delivery pump, 8-cerium dioxide modified activated carbon filler layer, 9-water outlet pipe, 10-filter filler layer, 11-partition screen, 12-buffer chamber, 13-premixing pipe. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to facilitate understanding by technicians.

[0026] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", etc., indicating the orientation or state relationship are based on the orientation or state relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "provided with", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.

[0028] like Figure 1 As shown, the sewage treatment device based on ferrate oxidation technology includes a sewage delivery pump 1, a potassium ferrate storage tank 2, a boric acid storage tank 3, a ferrate reserve tank 4 and a fixed bed reactor 5.

[0029] The potassium ferrate storage tank 2 and the boric acid storage tank 3 are connected to the ferrate reserve tank 4 through pipelines, and flow meters 6 are provided on the connecting pipelines. Potassium ferrate is stored in the potassium ferrate storage tank 2, and boric acid is stored in the boric acid storage tank 3. Potassium ferrate and boric acid are respectively metered by the flow meter 6 and sent to the ferrate reserve tank 4 to be configured as a ferrate reserve solution. A stirring paddle 15 is provided in the ferrate reserve tank 4. Since boric acid is easily decomposed by light, the tank body of the boric acid storage tank 3 needs to be made of a light-proof material, such as brown glass. At the same time, in order to avoid the photodecomposition of the prepared ferrate reserve solution, the ferrate reserve solution is intermittently configured, and the next tank is configured after the configured tank is used up.

[0030] The ferrate reserve solution in the ferrate reserve tank 4 is transported to the lower end of the fixed bed reactor 5 through the delivery pump 7 and the pipeline, and the sewage is transported to the lower end of the fixed bed reactor 5 through the sewage delivery pump 1 and the pipeline. The ferrate reserve solution and the sewage enter the fixed bed reactor 5 for oxidative removal of organic matter, and the sewage after the oxide is removed is discharged through the outlet pipe 9 arranged at the upper end of the fixed bed reactor 5. A cerium dioxide modified activated carbon filler layer 8 is arranged in the fixed bed reactor 5. By arranging the cerium dioxide modified activated carbon filler layer 8 in the fixed bed reactor 5, the cerium dioxide with reducing performance reacts with ferrate in a solid form in a heterogeneous phase. Compared with the homogeneous system, the utility model can gradually reduce Fe(VI) to Fe(V) / Fe(IV), realize the stable generation of Fe(IV) / Fe(V), slow down the self-decomposition rate of Fe(IV) / Fe(V), improve the effective utilization rate of Fe(VI), realize the continuous and effective removal and continuous purification of emerging organic pollutants in sewage, and improve the purification efficiency of sewage. At the same time, the cerium dioxide modified activated carbon used in the present invention is environmentally friendly and non-toxic, and will not cause new pollution to sewage.

[0031] In order to ensure that the sewage is fully mixed with the ferrate in the fixed bed reactor 5, a premixing pipe 13 is arranged between the outlet pipes of the delivery pump 7 of the ferrate storage tank 4 and the sewage delivery pump 1 and the fixed bed reactor 5, and the delivery pump 7 of the ferrate storage tank 4 and the outlet pipes of the sewage delivery pump 1 are respectively inserted into the premixing pipe 13 and communicated with the premixing pipe 13. Since the sewage flow rate is greater than the ferrate flow rate, the connection position between the delivery pump 7 of the ferrate storage tank 4 and the premixing pipe 13 is arranged above the sewage inlet, so that the large flow of sewage delivered by the sewage delivery pump 1 can quickly disperse the ferrate, so that the ferrate is mixed with the sewage and then enters the fixed bed reactor 5, so that Fe(VI) is dispersed in the sewage and then contacts with the cerium dioxide modified activated carbon, thereby improving the oxidation removal efficiency of organic matter in the sewage.

[0032] The fixed bed reactor 5 is a vertical fixed bed, the cerium dioxide modified activated carbon packing layer 8 is arranged in the middle, the filter packing layers 10 are arranged at both ends of the cerium dioxide modified activated carbon packing layer 8, and the cerium dioxide modified activated carbon packing layer 8 and the filter packing layer 10 are separated by a partition 11. The sewage and ferrate reserve solution mixed in the premixing tube 13 first enter the filter packing layer 10, and then enter the cerium dioxide modified activated carbon packing layer 8 after the solid impurity particles are filtered out by the filter packing layer 10, which can avoid or reduce the adhesion of solid phase particles in the sewage to the cerium dioxide modified activated carbon, and reduce the influence of solid phase particles on the oxidation and removal efficiency of organic matter. The filter packing layer 10 is filled with a mixture of glass beads and quartz, and the glass beads have the function of diverting water, and the quartz sand intercepts the solid phase particles.

[0033] As a preferred solution, a buffer chamber 12 is provided at the lower end of the fixed bed reactor 5, and a partition 11 is provided between the buffer chamber 12 and the filter packing layer 10. The ferrate and sewage mixed in the premixing tube 13 first enter the buffer chamber 12 and then enter the filter packing layer 10. By providing the buffer chamber 12, the ferrate and sewage can be further mixed, and the impact of the incoming water on the filter packing layer 10 can be reduced, and the flow rate of the sewage entering the filter packing layer 10 can be slowed down.

[0034] As a preferred solution, a buffer chamber 12 is also provided at the upper end of the fixed bed reactor 5. After the treated sewage is intercepted by the solid phase particles through the filter packing layer 10, it enters the buffer chamber 12 for buffering and is then discharged through the outlet pipe 9. It has been verified through experiments that if the buffer chamber 12 is not provided, the water flows directly into the outlet pipe 9 from the filter packing layer 10, and the water flow will impact the filter packing layer 10, affecting the stability of the filter packing layer 10.

[0035] The delivery pump 7 of the ferrate reserve tank 4 and the outlet pipe of the sewage delivery pump 1 are respectively provided with flow meters 6, through which the sewage and ferrate entering the fixed bed reactor 5 are measured, and the volume ratio of the ferrate reserve solution to the sewage is controlled according to the organic matter concentration in the sewage.

[0036] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A sewage treatment device based on ferrate oxidation technology, characterized in that: It comprises a sewage delivery pump (1), a potassium ferrate storage tank (2), a boric acid storage tank (3), a ferrate reserve tank (4) and a fixed bed reactor (5); The potassium ferrate storage tank (2) and the boric acid storage tank (3) are respectively connected to the ferrate reserve tank (4) via pipelines, and flow meters (6) are respectively provided on the connecting pipelines; The ferrate storage tank (4) is connected to the lower end of the fixed bed reactor (5) via a delivery pump (7) and a pipeline, and the sewage delivery pump (1) is connected to the lower end of the fixed bed reactor (5) via a pipeline; The fixed bed reactor (5) is filled with a cerium dioxide modified activated carbon filler layer (8); a water outlet pipe (9) is provided at the top of the fixed bed reactor (5); The delivery pump (7) of the ferrate storage tank (4) and the outlet pipe of the sewage delivery pump (1) are respectively provided with flow meters (6).

2. The sewage treatment device based on ferrate oxidation technology according to claim 1, characterized in that: The cerium dioxide modified activated carbon filler layer (8) is arranged in the middle of the fixed bed reactor (5), and filtering filler layers (10) are respectively arranged at both ends of the fixed bed reactor (5), and a partition (11) is arranged between the cerium dioxide modified activated carbon filler layer (8) and the filtering filler layer (10).

3. The sewage treatment device based on ferrate oxidation technology according to claim 2 is characterized in that: The filter packing layer (10) is filled with a mixture of glass beads and quartz sand.

4. The sewage treatment device based on ferrate oxidation technology according to any one of claims 1 to 3, characterized in that: A buffer chamber (12) is provided at the lower end of the fixed bed reactor (5), and a partition net (11) is provided between the buffer chamber (12) and the packing layer.

5. The sewage treatment device based on ferrate oxidation technology according to claim 1, characterized in that: A buffer chamber (12) is provided at the upper end of the fixed bed reactor (5), and a partition net (11) is provided between the buffer chamber (12) and the packing layer.

6. The sewage treatment device based on ferrate oxidation technology according to claim 1, characterized in that: The boric acid storage tank (3) is made of a light-proof material.

7. The sewage treatment device based on ferrate oxidation technology according to any one of claims 1 to 3, characterized in that: A premixing pipe (13) is provided between the outlet pipes of the delivery pump (7) and the sewage delivery pump (1) of the ferrate storage tank (4) and the fixed bed reactor (5); the outlet pipes of the delivery pump (7) and the sewage delivery pump (1) of the ferrate storage tank (4) are respectively connected to the premixing pipe (13), and the premixing pipe (13) is connected to the bottom end of the fixed bed reactor (5).

Images