CN204779004U - Organic waste water circulating fluidized bed fenton reactor - Google Patents

Abstract

The utility model discloses a fenton reactor for circulating fluidized bed of organic waste water, which comprises an inlet water dosing tank, a reaction tank and a sedimentation tank; _4. Dosing pipe, the bottom of which is connected with the water inlet pipe of the reaction tank; There is a water outlet tank a around the tank body, and an outlet pipe is installed on the side wall of the outlet tank a; the upper part of the sedimentation tank is square tank-shaped, and the lower part is cone-shaped. ; The upper part of the sedimentation tank is provided with an outlet tank b along the periphery of the tank body, and the outlet tank b is connected with a water outlet main pipe; the lower part of the sedimentation tank is connected with a circulation pump suction pipe and a circulation pump in turn. The utility model can effectively improve the fenton oxidation reaction efficiency, save the FeSO ₄ consumption, and reduce the sludge output.

Description

A kind of organic wastewater circulating fluidized bed fenton reactor

technical field

The utility model belongs to the technical field of waste water treatment, in particular to a fenton reactor of a circulating fluidized bed for organic waste water.

Background technique

Organic wastewater refers to wastewater discharged from industries such as papermaking, leather and food. These wastewaters contain a large amount of organic matter such as carbohydrates, fats, proteins, cellulose, etc. If they are discharged directly, they will cause serious pollution. With the rapid development of my country's economy, organic wastewater presents the characteristics of complex water quality, refractory biodegradation, high concentration and high toxicity. It is difficult to treat it up to standard by traditional biochemical methods. The advanced oxidation technology developed in the 1980s can oxidize pollutants by using the highly active intermediate hydroxyl radical ( OH) produced by physical and chemical processes such as light, sound, electricity, and magnetism. It has wide application range, fast reaction rate, The strong oxidation ability has great advantages in the treatment of highly toxic and refractory wastewater such as papermaking, printing and dyeing, pesticides, pharmaceutical wastewater and landfill leachate. Fenton (Fenton) oxidation process is exactly one of many oxidation processes, and this technology utilizes ferrous salt and hydrogen peroxide to form Fenton reagent to oxidize and degrade organic matter. Its essence is that under the catalysis of Fe ²⁺ , H ₂ O ₂ generates highly reactive OH and interacts with most organic substances to degrade them. Most of the current fenton reaction tanks are columnar towers, and the mass transfer is enhanced by air stirring. Due to the high height of the tower body and the high wind pressure required for stirring, the power consumption of the reaction tank is high. Moreover, the effluent from the reaction tank goes directly to the next treatment facility, so that Fe ²⁺ is not fully utilized, which increases the consumption of chemicals and sludge production. Therefore, the Fenton oxidation process generally has the disadvantages of high power consumption, large dosage of chemicals, and large amount of sludge generated in the actual application process.

Utility model content

The purpose of the utility model is to provide an organic wastewater circulating fluidized bed fenton reactor, which solves the problems of high power consumption, low drug utilization rate and large amount of sludge produced in the existing fenton reaction tank.

The technical solution adopted in the utility model is a circulating fluidized bed fenton reactor for organic waste water, which includes a water feed dosing tank, a reaction tank and a sedimentation tank;

The water inlet dosing tank is an inverted cone structure, the side wall of the water inlet dosing tank is connected with the water inlet main pipe and the FeSO ₄ dosing pipe, and the bottom of the water feeding dosing tank is connected with the reaction tank inlet pipe;

The reaction tank is a square tank structure. A central water distribution pipe is vertically arranged at the center of the bottom of the reaction tank. The end of the water inlet pipe of the reaction tank is connected with the central water distribution pipe. A water outlet pipe is installed on the side wall of a, and the water outlet pipe extends into the sedimentation tank;

The upper part of the sedimentation tank is a square tank structure, and the lower part is a cone structure. A central water distribution tube is arranged at the center of the upper part of the sedimentation tank, and the central water distribution tube is connected with the outlet pipe; The water tank b is connected with a water outlet main pipe; the lower part of the sedimentation tank is connected with a circulation pump suction pipe and a circulation pump in sequence.

The utility model is also characterized in that,

The top of the central water distribution cylinder is provided with an umbrella-shaped overflow device.

The bottom of the reaction tank is provided with an annular jet stirring device along the periphery of the tank, and the annular jet stirring device is sequentially connected with a _{H2O2 dosing} pipe, a circulation pump discharge pipe and a circulation pump.

The annular jet stirring device is composed of an annular main pipe and several ejectors with injection ports facing the inner side of the reaction tank.

The cross section of the tank body of the water inlet and dosing tank is a "D" shaped structure.

The beneficial effect of the utility model is that a kind of organic waste water circulating fluidized bed fenton reactor can strengthen the hydraulic shearing action of the swirl process through the feed water dosing tank with a "D" shaped cross section, and improve FeSO ₄ and The mixing effect of organic wastewater; by setting an umbrella-shaped overflow device, the influent water can be evenly distributed to prevent radial channel flow; by setting an annular jet stirring device, the full mixing of H2O2, waste water and Fe2+ can be realized, and it has the ability to prevent pollution Agitation of mud deposits. The utility model can effectively improve the fenton oxidation reaction efficiency, save the FeSO ₄ consumption, and reduce the sludge output.

Description of drawings

Fig. 1 is the structural representation of the utility model fenton reaction tank;

Fig. 2 is the top view of the utility model fenton reaction tank;

Fig. 3 is a schematic structural view of the annular jet stirring device in the fenton reaction tank of the present invention.

In the figure, 1. water inlet main pipe, 2. FeSO ₄ dosing pipe, 3. water inlet dosing tank, 4. reaction tank inlet pipe, 5. central water distribution pipe, 6. reaction tank, 7. outlet tank a, 8 .Water outlet pipe, 9. Central water distribution tube, 10. Sedimentation tank, 11. Water outlet tank b, 12. Water outlet main pipe, 13. Circulation pump suction pipe, 14. Circulation pump, 15. Circulation pump discharge pipe, 16. H ₂ O ₂ dosing pipes, 17. annular jet stirring device, 18. umbrella overflow device, 19. annular main pipe, 20. ejector.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Fig. 1 and Fig. 2, a kind of organic wastewater circulating fluidized bed fenton reactor comprises feed water dosing tank 3, reaction tank 6 and sedimentation tank 10; feed water dosing tank 3 is an inverted cone structure, its The cross-section is a "D"-shaped structure, the side wall of the water inlet dosing tank 3 is connected with the water inlet main pipe 1 and the FeSO ₄ dosing pipe 2, and the bottom of the water inlet dosing tank 3 is connected with the reaction tank water inlet pipe 4; the reaction tank 6 is a square tank structure, a central water distribution pipe 5 is vertically arranged at the center of the bottom of the reaction tank 6, an umbrella-shaped overflow device 18 is installed on the top of the central water distribution pipe 5, and the end of the reaction tank inlet pipe 4 is connected to the central water distribution pipe 5 Connected, the top of the reaction tank 6 is provided with a water outlet tank a7 along the periphery of the tank body, and the side wall of the water outlet tank a7 is equipped with an outlet pipe 8, and the outlet pipe 8 extends into the inside of the sedimentation tank 10; the bottom of the reaction tank 6 is along the periphery of the tank body. An annular jet stirring device 17 is provided, and the annular jet stirring device 17 is sequentially connected with a H ₂ O ₂ dosing pipe 16, a circulating pump discharge pipe 15 and a circulating pump 14; the upper part of the sedimentation tank 10 is a square tank structure, and the lower part of the sedimentation tank 10 It is a cone structure, and a central water distribution cylinder 9 is arranged at the center of the upper part of the sedimentation tank 10, and the central water distribution cylinder 9 is connected with the outlet pipe 8; Outlet main pipe 12; the bottom of sedimentation tank 10 is connected with circulation pump suction pipe 13 and circulation pump 14 in sequence.

As shown in FIG. 3 , the annular jet stirring device 17 is composed of an annular manifold 19 and several jets 20 with injection ports facing the inside of the reaction tank.

The working principle of the utility model is that the organic waste water and _FeSO4 solution enter the water inlet dosing tank 3 through the _FeSO4 dosing pipe 2 through the water inlet main pipe 1, and pass through the reaction tank water inlet pipe under the action of static pressure after being mixed by swirling flow 4 Enter the central water distribution pipe 5, rely on the umbrella-shaped overflow device 18 at the top of the central water distribution pipe 5 to evenly distribute water, and then enter the reaction tank 6. The waste water in the reaction tank 6 enters the outlet pipe 8 after being collected by the outlet tank a7, and then flows into the central water distribution cylinder 9, and then enters the settling tank 10 after uniform water distribution in the circumferential direction. The upper part of the sedimentation tank 10 is the treated wastewater containing less suspended solids, which enters the outlet tank b11 of the sedimentation area and is collected to the water outlet main pipe 12 for discharge; the lower part of the sedimentation area is chemical sludge with a high Fe ²⁺ content, which is absorbed by the circulation pump Pipe 13, circulation pump 14 and circulation pump discharge pipe 15 are sent to the annular jet stirring device ₁₇ at the bottom of the reaction tank ₆ , H2O2 ^{is added from the H2O2 dosing pipe 16 and mixed with Fe2+} _{to enter} the annular jet The stirring device 17 makes the oxidation reaction of the organic wastewater in the reaction tank 6 proceed evenly.

During the whole process, the organic matter in the organic wastewater is oxidized and degraded by OH in the reaction tank, and the chemical sludge containing a large amount of Fe ²⁺ in the sedimentation tank is mixed with H ₂ O ₂ and then pumped to the annular jet stirring device to promote the organic wastewater The oxidation reaction is carried out uniformly and effectively, and has the advantages of saving the amount of FeSO ₄ and reducing the sludge output.

Claims (5)

1. A circulating fluidized bed fenton reactor for organic waste water, characterized in that: comprise water inlet dosing tank (3), reaction tank (6) and settling tank (10); The water inlet dosing tank (3) is an inverted cone structure, the side wall of the water inlet dosing tank (3) is connected with the water inlet main pipe (1) and the _FeSO4 dosing pipe (2), the water inlet dosing tank The bottom of (3) is communicated with reaction tank water inlet pipe (4); The reaction tank (6) is a square tank structure, the center of the bottom of the reaction tank (6) is vertically arranged with a central water distribution pipe (5), and the end of the reaction tank water inlet pipe (4) communicates with the central water distribution pipe (5) , the top of the reaction tank (6) is provided with an outlet tank a (7) along the periphery of the tank body, the side wall of the outlet tank a (7) is equipped with an outlet pipe (8), and the outlet pipe (8) stretches into the sedimentation tank ( 10) interior; The upper part of the settling tank (10) is a square tank structure, the lower part of the settling tank (10) is a cone structure, and a central water distribution tube (9) is arranged at the center of the upper part of the settling tank (10), and the central water distribution tube (9) It is connected with the water outlet pipe (8); the upper part of the sedimentation tank (10) is provided with a water outlet b (11) along the periphery of the tank body, and the water outlet b (11) is connected with the water outlet main pipe (12); the lower part of the sedimentation tank (10) A circulation pump water suction pipe (13) and a circulation pump (14) are connected in sequence. 2. The fenton reactor according to claim 1, characterized in that: an umbrella-shaped overflow device (18) is installed on the top of the central water distribution pipe (5). 3. The fenton reactor according to claim 1, characterized in that: the bottom of the reaction tank (6) is provided with an annular jet stirring device (17) along the periphery of the tank body, and the annular jet stirring device (17) is connected successively with H ₂ O ₂ dosing pipe (16), circulation pump discharge pipe (15) and circulation pump (14). 4. The fenton reactor according to claim 3, characterized in that: the annular jet agitation device (17) is composed of an annular main pipe (19) and several ejectors (20) with injection ports facing the inside of the reaction tank. 5. The fenton reactor according to claim 1, characterized in that: the cross section of the water inlet dosing tank (3) is a "D" shaped structure.