CN114212872B - Stirring type heterogeneous Fenton reactor and organic wastewater treatment method - Google Patents

Abstract

The invention discloses a stirring type heterogeneous Fenton reactor and an organic wastewater treatment method, wherein the inside of a cylinder body is divided into a reaction chamber and an aeration chamber through an aeration plate, a catalyst feed inlet, an exhaust pipe and a speed reducer driven by a motor are arranged on a top cover plate, and a stirring shaft connected with the speed reducer is inserted into the bottom of the reaction chamber; the bottom of the stirring shaft is fixedly provided with a rake stirring arm, and bends at two ends of the rake stirring arm and rake teeth are bent towards the stirring shaft; an axial flow type stirring blade is arranged above the rake stirring arm; a wastewater inlet pipe, a hydrogen peroxide inlet pipe and a regulating liquid inlet pipe are respectively arranged above the cavity wall of the cylinder body, a treatment liquid outlet pipe is arranged on the side wall of the bottom of the reaction chamber, and an air inlet pipe is arranged on the side wall of the aeration chamber; the cavity wall of the reaction chamber of the cylinder body is also provided with a liquid level sensor. In the invention, the fluidization of the catalyst adopts mechanical stirring, and aims at the characteristic of small treatment capacity of waste water and waste liquid in a laboratory, adopts gap operation, and the whole structure is suitable for the characteristic of small space in the laboratory, thereby realizing the miniaturization of the device.

Description

Stirring type heterogeneous Fenton reactor and organic wastewater treatment method

Technical Field

The invention relates to a reactor, in particular to a stirring type heterogeneous Fenton reactor and an installation and use method thereof.

Background

Along with the rapid development of society and economy, a large number of chemical enterprises can produce a large amount of waste water and waste liquid while meeting the material demands of people, various substances with great damage to the environment, such as organic matters, antibiotics, dyes, herbicides and the like are contained in the waste water and waste liquid, and the substances are relatively stubborn and difficult to treat, and the earth environment presents a very critical state along with the increase of the organic waste water and waste liquid.

At present, in the advanced oxidation technology for treating high-concentration multicomponent organic wastewater and waste liquid, fenton oxidation technology is uniformly accepted in the industry, and the core of Fenton technology is that hydroxyl free radicals generated by decomposing hydrogen peroxide are taken as an oxidant, ferrous ions are taken as a catalyst for promoting the decomposition of hydrogen peroxide, and after the reaction, iron ions form precipitation by regulating alkali. The application of the traditional Fenton technology has a narrow pH value application range, and the catalyst cannot be reused and also can form polluted iron mud, so that the traditional Fenton technology is gradually replaced by the heterogeneous Fenton technology, the heterogeneous phase is that the catalyst is solid, and then the heterogeneous Fenton fluidized bed technology is raised, the core of the technology is fluidization of the solid catalyst, and the catalyst particles are suspended in water by utilizing the flow of fluid from bottom to top. The heterogeneous Fenton fluidized bed technology is characterized in that the organic wastewater to be treated is large, and the treatment device can be in a continuous operation state, so that the efficiency of the equipment is maximized. The actual situation is that a large number of laboratories of enterprises and institutions exist in various places except a few large-flux treatment sources, the situation that the treatment capacity of organic wastewater is small but the organic wastewater needs to be treated exists generally, the embarrassment that the storage is difficult, the transportation is difficult and the organic wastewater cannot be discharged in disorder exists generally, the heterogeneous Fenton fluidized bed technology for treating the organic wastewater by large-flux obviously cannot meet the requirements, and the development of a small device for treating the organic wastewater by gap operation is urgent.

Disclosure of Invention

The invention aims to: in view of the above prior art, a stirred heterogeneous Fenton reactor and an organic wastewater treatment method are proposed as a small-sized device for organic wastewater treatment capable of intermittent operation.

The technical scheme is as follows: a stirred heterogeneous Fenton reactor comprising: the device comprises a cylinder body, wherein an aeration plate is arranged above a flat bottom of the cylinder body, the space in the cylinder body is divided into two parts by the aeration plate, the part with a large upper space is a reaction chamber, the part with a small lower space is an aeration chamber, and the diameter of circular through holes arranged in an array on the aeration plate is smaller than the diameter of a ball-shaped catalyst used by the reactor;

the top of the cylinder body is provided with a cover plate, the cover plate is provided with a catalyst feed inlet, an exhaust pipe and a speed reducer, the speed reducer is driven by a motor at the top, and a stirring shaft connected with the speed reducer is inserted into the bottom of the reaction chamber from a through hole in the center of the cover plate; a filter screen for gas-liquid separation is arranged at the inlet of the exhaust pipe;

the bottom of the stirring shaft is fixedly provided with a rake stirring arm, the rake stirring arm is bilaterally symmetrical, two ends of the rake stirring arm are provided with 1 elbow, two symmetrical sides are provided with a plurality of rake teeth, and the elbow and the rake teeth are bent towards the stirring shaft; a stirring blade connected to the stirring shaft is arranged above the rake stirring arm, and the stirring blade is of an axial type;

a wastewater inlet pipe, a hydrogen peroxide inlet pipe and a regulating liquid inlet pipe are respectively arranged above the cavity wall of the cylinder body, a treatment liquid outlet pipe is arranged on the side wall of the bottom of the reaction chamber, an air inlet pipe and a residual treatment liquid outlet pipe are arranged on the side wall of the aeration chamber, electromagnetic valves are respectively arranged on the treatment liquid outlet pipe, the air inlet pipe and the residual treatment liquid outlet pipe, and a filter screen with meshes smaller than the diameter of the ball-shaped catalyst is arranged at the inlet of the treatment liquid outlet pipe; the liquid level sensor is also arranged on the cavity wall of the reaction chamber of the cylinder body.

Further, a sleeve capable of sliding up and down is arranged on the stirring shaft, the stirring blade is fixed on the side wall of the sleeve, and the sleeve is fastened with the stirring shaft through a screw on the side face.

Further, the exhaust pipe is bent pipe-shaped, and the outlet is at an elevation angle of 5 degrees with the horizontal direction.

Further, a plurality of first through holes are distributed along the circumference array of the cover plate, a table edge is arranged at the opening of the upper part of the cylinder body, a plurality of second through holes are distributed along the circumference array of the upper plane of the table edge, and the cover plate is fixed through the first through holes and the second through holes in a bolt connection mode.

Further, a handle is further arranged on the cover plate.

The organic wastewater treatment method of the stirring type heterogeneous Fenton reactor comprises the following steps:

step 1: pouring the ball-shaped catalyst into the reactor through a catalyst feed port, controlling the air inlet pressure of an air inlet pipe to be one fourth of the normal working air pressure, and enabling compressed air to enter an aeration chamber;

step 2: pumping the organic wastewater to be treated into a reaction chamber through a wastewater inlet pipe, wherein the organic wastewater to be treated does not flow into an aeration chamber due to the inlet of external high-pressure air; when the liquid level of the organic wastewater reaches the height of the liquid level sensor, stopping inputting the organic wastewater, and controlling the air inlet pressure of the air inlet pipe to return to the normal working air pressure;

step 3: hydrogen peroxide is input through a hydrogen peroxide inlet pipe;

step 4: inputting an adjusting liquid through an adjusting liquid inlet pipe, so that the PH value of the organic wastewater to be treated meets the hydrogen peroxide decomposition requirement;

step 5: the motor is started, the stirring shaft is driven to rotate by the speed reducer, the harrow type stirring arms below the stirring shaft fully stir the ball-shaped catalyst, the bends at two sides of the stirring shaft and the harrow teeth which are symmetrical on two sides of the stirring shaft utilize the bending of the stirring shaft to stir the ball-shaped catalyst to the direction of the stirring shaft, the stirring blades above the harrow type stirring arms rotate to generate upward lifting force, the ball-shaped catalyst is pushed to the upper side, when the ball-shaped catalyst reaches the top of the liquid level, the ball-shaped catalyst spreads to the periphery, then the ball-shaped catalyst is settled down to the bottom of the reaction chamber due to the action of gravity, and then the ball-shaped catalyst is stirred by the harrow type stirring arms to push the ball-shaped catalyst to the direction of the stirring shaft at the center, so that circulating circulation is formed;

step 6: in the working condition, high-pressure air is aerated into the reaction chamber through the aeration plate, bubbles are continuously stirred by the stirring device to generate burst, and the molecular bonds of organic matters in the organic wastewater can be broken by high-temperature high-pressure energy generated by the burst bubbles instantly; the water vapor carrying the organic wastewater generated in the working condition is discharged through an exhaust pipe, and the organic wastewater droplets after gas-liquid separation are dripped into the reactor;

step 7: after the equipment runs for a preset time, the motor is turned off, the air inlet pressure of the air inlet pipe is controlled to be reduced to one fourth of the normal working air pressure, the air pressure is used for preventing the organic wastewater from flowing into the aeration chamber, and the treated organic wastewater in the reaction chamber is discharged through the treatment liquid outlet pipe;

step 8: and after the organic wastewater is emptied, cutting off an external high-pressure air source.

Further, after the aeration chamber is reserved with a certain amount of organic wastewater, the reserved wastewater is emptied through a residual treatment liquid outlet pipe.

The beneficial effects are that: 1. the stirring device is designed in a combined way and consists of a rake stirring arm and an axial flow blade, wherein the axial flow blade can freely adjust the position of the axial flow blade on a stirring shaft according to working conditions, in the working process, bends at two sides of the rake stirring arm and rake teeth at two sides of the rake stirring arm are used for stirring a catalyst to the direction of the stirring shaft, 3 axial flow blades above the rake stirring arm generate upward lifting force due to rotation, the lifting force pushes the ball-shaped catalyst to the upper side, when the ball-shaped catalyst reaches the top of a liquid level, the ball-shaped catalyst diffuses to the surrounding reactor wall, then the ball-shaped catalyst is settled downwards to the bottom of a reaction chamber due to gravity, and then the ball-shaped catalyst is stirred by the rake stirring arm to push the ball-shaped catalyst to the direction of a central stirring shaft, so that circulating circulation is formed, and the ball-shaped catalyst is fully suspended in organic wastewater, so that fluidization of the catalyst is realized.

2. According to the invention, the design of the aeration plate is adopted, the circulation and suspension of the ball-shaped catalyst are facilitated by the bubbles generated by the aeration plate, the bubbles are continuously stirred by the stirring device to generate burst, and the molecular bonds of organic matters in the organic wastewater can be destroyed to a certain extent by the high temperature and high pressure generated by the burst bubbles instantly, so that the oxidation of the organic wastewater is facilitated.

3. The reactor adopts a flat bottom design to realize miniaturization, is more suitable for the characteristic of small laboratory space, is convenient to put, move and operate, and can be connected with a controller through a pump, an electromagnetic valve, a sensor and a motor, and automatic control can be realized through PLC programming.

Drawings

FIG. 1 is a sectional view of the invention in installation;

FIG. 2 is a top plan view of the present invention;

FIG. 3 is an enlarged view of the invention at A;

FIG. 4 is a schematic view of a stirring device according to the present invention;

FIG. 5 is a schematic illustration of catalyst fluidization in the present invention.

Detailed Description

The invention is further explained below with reference to the drawings.

As shown in fig. 1, the reactor comprises a cylinder body 1, a cover plate 16 and a stirring device.

The cylinder body 1 is in a straight cylinder shape, the upper part of the cylinder body is in an opening shape, a table edge is arranged at the opening part of the upper part, 8 second through holes 30 are arrayed on the circumference of the upper plane of the table edge, a flat bottom is arranged below the cylinder body 1, and the flat bottom cylinder body 1 is convenient to place or move; the flat top of stack 1 sets up an aeration board 2, aeration board 2 is circular, aeration board 2 divide into two with the space in the stack 1, and the big part in top space is the reaction chamber, and the little part in below space is the aeration chamber, circular through-hole has been arranged to the array on the aeration board 2, and the diameter of through-hole is less than the diameter of the ball-shaped catalyst that this reactor used, can prevent ball-shaped catalyst entering aeration chamber.

The reaction chamber of the cylinder body 1 is provided with a waste water inlet pipe 3, a hydrogen peroxide inlet pipe 5 and an adjusting liquid inlet pipe 7 which are respectively connected with a #1 pump 4, a #2 pump 6 and a #3 pump 8.

The reaction chamber of barrel 1 is provided with 1 treatment liquid outlet pipe 9 below the chamber wall, and its entry is provided with the filter screen, and the mesh of filter screen is less than the diameter of ball shape catalyst, can prevent the escape of ball shape catalyst, treatment liquid outlet pipe 9 is connected #1 solenoid valve 10.

The wall of the reaction chamber of the cartridge 1 is provided with 1 level sensor 15.

The cavity wall of the aeration chamber of the cylinder body 1 is provided with 1 air inlet pipe 13 which is connected with a #3 electromagnetic valve 14; the lower part of the cavity wall of the aeration chamber of the cylinder body 1 is provided with 1 residual treatment liquid outlet pipe 11 which can discharge residual wastewater and fine silt and is connected with a #2 electromagnetic valve 12.

As shown in fig. 1-3, the cover plate 16 is disc-shaped, the disc body of the cover plate 16 is just inserted into the inner cavity of the cylinder body 1, the cover edge of the cover plate is just matched with the table edge of the cylinder body 1, the outer diameters of the cover plate and the table edge are the same, 8 first through holes 29 are arranged in a circumferential array on the cover of the cover plate 16, and the 8 first through holes 29 and 8 second through holes 30 are the same in size and consistent in position.

The center position of the cover plate 16 is provided with 1 speed reducer 18, the upper side of the speed reducer 18 is provided with 1 motor 17, the center position of the cover plate 16 is provided with 1 shaft sleeve 19, the stirring shaft 20 just penetrates through the shaft sleeve, and the support and the transmission of the stirring shaft 20 depend on the speed reducer 18.

The cover plate 16 is provided with 1 catalyst feed inlet 26, the catalyst feed inlet 26 is funnel-shaped, a cover is arranged above the catalyst feed inlet 26, and the catalyst feed inlet is uncovered when not in use during feeding.

The cover plate 16 is provided with 1 exhaust pipe 27, the exhaust pipe 27 is in a bent pipe shape, an upper outlet of the exhaust pipe is in an elevation angle of 5 degrees with the horizontal direction, and a filter screen is arranged below the exhaust pipe, so that vapor-liquid separation is facilitated.

The cover plate 16 is provided with 4 handles 28 arranged in an array.

As shown in fig. 1 and 4, the stirring device is composed of a stirring shaft 20, a rake stirring arm 21 and stirring blades 25.

The stirring shaft 20 is driven by the speed reducer 18, 1 rake stirring arm 21 is welded below the stirring shaft 20, the rake stirring arms 21 are bilaterally symmetrical, 1 elbow 22 is arranged on two sides of each rake stirring arm, 4 rake teeth 23 are arranged on two sides of each rake stirring arm, and the elbow 22 and the rake teeth 23 are bent towards the stirring shaft.

A sleeve 24 is arranged above the rake stirring arm 21 and sleeved on the stirring shaft 20, 3 stirring blades 25 are arranged on the side wall of the sleeve 24 in an array manner, and the stirring blades 25 are in an axial flow type.

A threaded through hole 31 is respectively arranged between the circumferences of the stirring paddles 25 on the sleeve 24, and a screw is screwed into the threaded through hole 31 until the screw is screwed, so that the sleeve 24 can be fixed on the stirring shaft 20.

The screw in the threaded through hole 31 is loosened, and the upper and lower positions of the axial flow stirring paddle can be freely adjusted according to working conditions so as to adapt to the requirements of the working conditions.

As shown in figure 5, in operation, the bends on the two sides of the rake stirring arm and the rake teeth on the two sides utilize the bending of the rake stirring arm to stir the catalyst to the stirring shaft direction, and the 3 axial flow blades above the rake stirring arm generate upward lifting force due to rotation, and the lifting force pushes the ball-shaped catalyst to the upper side, when the ball-shaped catalyst reaches the top of the liquid level, the ball-shaped catalyst diffuses to the surrounding reactor walls, then the ball-shaped catalyst is settled downwards until reaching the bottom of the reactor due to gravity, and is then stirred by the rake stirring arm to push the ball-shaped catalyst to the central stirring shaft direction, so that circulating circulation is formed, and the ball-shaped catalyst is fully suspended in organic wastewater, thereby realizing fluidization of the catalyst.

The installation and use method of the reactor are as follows:

1. and installing barrel equipment.

Firstly, an aeration plate 2 is welded and installed at a designated position of the inner cavity of a cylinder body, a wastewater inlet pipe 3, a hydrogen peroxide inlet pipe 5, an alkali liquor inlet pipe 7, a treatment liquid outlet pipe 9, a residual treatment liquid outlet pipe 11 and an air inlet pipe 13 are installed at each designated position, a #1 pump 4, a #2 pump 6, a #3 pump 8, a #1 electromagnetic valve 10, a #2 electromagnetic valve 12 and a #3 electromagnetic valve 14 are respectively connected, and then a liquid level sensor 15 is installed at the designated position.

2. And installing a stirring device.

The rake stirring arm 21 is welded to the bottom of the stirring shaft 20, the rake stirring arm 21 is symmetrical left and right during welding, the stirring paddle intermediate body 24 is sleeved into the stirring shaft 20 by using a round hole in the center of the stirring paddle intermediate body 24 to an ideal position, and 3 threaded through holes 31 are formed in the stirring paddle intermediate body 24 and screwed into the threaded through holes 31 until screwing.

3. And installing a cover plate.

The method comprises the steps of welding 4 handles to a designated position, installing a catalyst feed port 26 and an exhaust pipe 27 to the designated position, fixing the catalyst feed port 26 and the exhaust pipe by a welding method, installing a shaft sleeve 19 to the designated position and fixing the shaft sleeve by welding, inserting the upper end of a stirring shaft 20 in the assembled stirring device into the shaft sleeve 19 until the upper end of the stirring shaft is above a cover plate 16, connecting the stirring shaft with a speed reducer 18, installing and fixing the speed reducer 18, installing a motor 17 above the speed reducer 18, and connecting the speed reducer 18.

4. And (5) installing the whole machine.

The installed cover plate 16 is covered in the cylinder body 1, and the cover plate is fastened by using bolts through 8 first through holes 29 which are arranged in an array manner and 8 second through holes 30 which are arranged in an array manner along the upper edge of the cylinder body.

5. A method for using the reactor.

5-1, pouring a proper amount of ball-shaped catalyst into the reactor through the catalyst feed port 26, controlling the air inlet pressure of the air inlet pipe 13 to be one fourth of the normal working air pressure by the controller through the #3 electromagnetic valve 14, enabling compressed air to enter the aeration chamber, opening the #1 pump 4 to pump organic wastewater to be treated into the reaction chamber through the wastewater inlet pipe 3, enabling the organic wastewater to flow into the aeration chamber due to the entering of external high-pressure air, sending a signal to the controller by the liquid level sensor 15 when the liquid level 32 of the organic wastewater reaches the ideal height, cutting off the switch of the #1 pump 4 by the controller, controlling the air inlet pressure of the air inlet pipe 13 to be the normal working air pressure by the controller through the #3 electromagnetic valve 14, and at the moment, switching on the #2 pump 6 and inputting a proper amount of hydrogen peroxide through the hydrogen peroxide inlet pipe 5.

5-2, opening a #3 pump 8, and inputting a proper amount of regulating liquid through a regulating liquid inlet pipe 7, so that the PH value of the organic wastewater to be treated meets the hydrogen peroxide decomposition requirement.

5-3, turning on the motor 17 to drive the stirring shaft 20 through the speed reducer 18, and rotating the stirring shaft 20 at a proper rotation speed, at this time, the rake stirring arms 21 below the stirring shaft 20 fully stir the pellet catalyst, the elbows 22 on two sides and the rake teeth 23 on two sides of the rake stirring arm fully stir the catalyst towards the stirring shaft 20 by bending of the rake stirring arms, the 3 stirring blades 25 above the rake stirring arms 21 generate upward lifting force due to rotation, the upward lifting force pushes the pellet catalyst upwards, when the pellet catalyst reaches the top of the liquid level 32, the pellet catalyst diffuses towards the surrounding reactor walls, and then downwards settles down to the bottom of the reaction chamber due to gravity, and is then stirred by the rake stirring arms 21 to push towards the central stirring shaft 20, so that circulating circulation is formed, and the pellet catalyst is fully suspended in organic wastewater.

5-4, in the working condition, high-pressure air is aerated into the reaction chamber through the aeration plate 2, the bubbles generated by the aeration plate 2 are helpful for circulation and suspension of the ball-shaped catalyst, the bubbles are continuously stirred by the stirring device to generate burst, and the high temperature and high pressure generated by the burst bubbles can damage molecular bonds of organic matters in the organic wastewater to a certain extent, so that the method has a helpful effect on oxidation of the organic wastewater.

5-5, the vapor carrying the organic waste water that produces in the operating mode is discharged through blast pipe 27, and blast pipe 27 is the return bend form, and its upper outlet is 5 angle of elevation with the horizontal direction, and its below is provided with the filter screen, does benefit to vapour-liquid separation like this, and the organic waste water liquid drop after the separation drips back in the reactor.

5-6, after the equipment operates for 1 hour, the controller turns off the motor 17, the stirring device stops operating, the controller controls the air inlet pressure of the air inlet pipe 13 to be reduced to one fourth of the normal working air pressure through the #3 electromagnetic valve 14, the air pressure is enough to prevent the organic wastewater from flowing into the aeration chamber, the #1 electromagnetic valve 10 is opened to discharge the treated organic wastewater through the treatment liquid outlet pipe 9, and after the aeration chamber is reserved with a certain amount of organic wastewater, the #2 electromagnetic valve 12 can be opened to empty the reserved wastewater through the residual treatment liquid outlet pipe 11.

5-7, after the organic wastewater is emptied, the controller closes the #3 electromagnetic valve 14 to cut off an external high-pressure air source.

Aiming at the embarrassment that the organic wastewater and the waste liquid in laboratories of enterprises and public institutions are small in treatment capacity, difficult to store and transport and difficult to discharge in disorder, the stirring type heterogeneous Fenton reactor provided by the invention has the advantages that the mechanical stirring type heterogeneous Fenton reactor is adopted for fluidization of a catalyst, the gap operation is adopted for the characteristic of small treatment capacity of the waste water and the waste liquid in the laboratories, the whole structure is suitable for the characteristic of small laboratory space, and the miniaturization is realized, and the arrangement, the movement and the operation are relatively convenient.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (7)

1. A stirred heterogeneous Fenton reactor, comprising: the reactor comprises a cylinder body (1), wherein an aeration plate (2) is arranged above a flat bottom of the cylinder body (1), the space in the cylinder body (1) is divided into two parts by the aeration plate (2), the part with large upper space is a reaction chamber, the part with small lower space is an aeration chamber, and the diameter of circular through holes arranged in an array on the aeration plate (2) is smaller than that of a ball-shaped catalyst used by the reactor;

the top of the cylinder body (1) is provided with a cover plate (16), the cover plate (16) is provided with a catalyst feed inlet (26), an exhaust pipe (27) and a speed reducer (18), the speed reducer (18) is driven by a motor (17) at the top, and a stirring shaft (20) connected with the speed reducer (18) is inserted into the bottom of the reaction chamber from a through hole in the center of the cover plate (16); a filter screen for gas-liquid separation is arranged at the inlet of the exhaust pipe (27);

the bottom of the stirring shaft (20) is fixedly provided with a rake stirring arm (21), the rake stirring arm (21) is bilaterally symmetrical, two ends of the rake stirring arm are provided with 1 elbow (22), two symmetrical sides are provided with a plurality of rake teeth (23), and the elbow (22) and the rake teeth (23) are bent towards the stirring shaft; a stirring blade (25) connected to the stirring shaft (20) is arranged above the rake stirring arm (21), and the stirring blade (25) is of an axial flow type;

a wastewater inlet pipe (3), a hydrogen peroxide inlet pipe (5) and a regulating fluid inlet pipe (7) are respectively arranged above the cavity wall of the cylinder body (1), a treatment fluid outlet pipe (9) is arranged on the side wall of the bottom of the reaction chamber, an air inlet pipe (13) and a residual treatment fluid outlet pipe (11) are arranged on the side wall of the aeration chamber, electromagnetic valves are respectively arranged on the treatment fluid outlet pipe (9), the air inlet pipe (13) and the residual treatment fluid outlet pipe (11), and a filter screen with meshes smaller than the diameter of the ball-shaped catalyst is arranged at the inlet of the treatment fluid outlet pipe (9); the liquid level sensor (15) is also arranged on the cavity wall of the reaction chamber of the cylinder body (1).

2. Stirring heterogeneous Fenton reactor according to claim 1, characterized in that the stirring shaft (20) is provided with a sleeve (24) which can slide up and down, the stirring blades are fixed on the side wall of the sleeve (24), and the sleeve (24) is fastened with the stirring shaft (20) through a lateral screw.

3. A stirred tank out of phase Fenton reactor according to claim 1, characterized in that said exhaust pipe (27) is bent in shape, the outlet being at an elevation angle of 5 ° to the horizontal.

4. The stirring heterogeneous Fenton reactor according to claim 1, wherein the cover plate (16) is provided with a plurality of first through holes (29) in a circumferential array, a table edge is arranged at an opening at the upper part of the cylinder body (1), a plurality of second through holes (30) in a circumferential array are arranged on an upper plane of the table edge, and the cover plate (16) is fixed by connecting the first through holes (29) and the second through holes (30) through bolts.

5. Stirred heterogeneous Fenton reactor according to claim 1, characterized in that the cover plate (16) is further provided with a handle (28).

6. A method for organic wastewater treatment in a stirred heterogeneous Fenton reactor according to any of claims 1-5, comprising:

step 1: pouring the ball-shaped catalyst into the reactor through a catalyst feed port (26), controlling the air inlet pressure of an air inlet pipe (13) to be one fourth of normal working air pressure, and enabling compressed air to enter an aeration chamber;

step 2: pumping the organic wastewater to be treated into the reaction chamber through a wastewater inlet pipe (3), wherein the organic wastewater to be treated does not flow into the aeration chamber due to the inlet of external high-pressure air; when the liquid level (32) of the organic wastewater reaches the height of the liquid level sensor (15), stopping inputting the organic wastewater, and controlling the air inlet pressure of the air inlet pipe (13) to return to the normal working air pressure;

step 3: hydrogen peroxide is input through a hydrogen peroxide inlet pipe (5);

step 4: inputting an adjusting liquid through an adjusting liquid inlet pipe (7) to enable the PH value of the organic wastewater to be treated to meet the hydrogen peroxide decomposition requirement;

step 5: the motor (17) is started, the stirring shaft (20) is driven to rotate through the speed reducer (18), the harrow-shaped stirring arms (21) below the stirring shaft (20) fully stir the ball-shaped catalyst, the elbows (22) on two sides of the stirring shaft and the harrow teeth (23) which are symmetrical on two sides of the stirring shaft stir the ball-shaped catalyst to the direction of the stirring shaft (20) by utilizing the bending of the stirring blades, the stirring blades (25) above the harrow-shaped stirring arms (21) rotate to generate upward lifting force, the ball-shaped catalyst is pushed to the upper side, when the ball-shaped catalyst reaches the top of the liquid level (32), the ball-shaped catalyst is diffused to the periphery, then the ball-shaped catalyst is settled down to the bottom of the reaction chamber due to the action of gravity, and then the stirring arms (21) stir the ball-shaped catalyst to the direction of the stirring shaft (20) on the two sides, so that circulating circulation is formed;

step 6: in the working condition, high-pressure air is aerated into the reaction chamber through the aeration plate (2), bubbles are continuously stirred by the stirring device to generate bursts, and the molecular bonds of organic matters in the organic wastewater can be broken by high-temperature high-pressure energy generated by the bursts of the bubbles instantaneously; the water vapor carrying the organic wastewater generated in the working condition is discharged through an exhaust pipe (27), and the organic wastewater droplets after gas-liquid separation are dripped into the reactor;

step 7: after the equipment runs for a preset time, the motor (17) is turned off, the air inlet pressure of the air inlet pipe (13) is controlled to be reduced to one fourth of the normal working air pressure, the air pressure at the moment is used for preventing the organic wastewater from flowing into the aeration chamber, and the treated organic wastewater in the reaction chamber is discharged through the treatment liquid outlet pipe (9);

step 8: and after the organic wastewater is emptied, cutting off an external high-pressure air source.

7. The method for treating organic wastewater according to claim 6, wherein after a certain amount of organic wastewater is retained in the aeration chamber, the retained wastewater is drained through a residual treatment liquid outlet pipe (11).

Images