CN108689475B

CN108689475B - Fenton oxidation baffled reactor and organic wastewater treatment method

Info

Publication number: CN108689475B
Application number: CN201810708619.6A
Authority: CN
Inventors: 卢伟; 王丹丹; 陈福明
Original assignee: Shenzhen Research Institute Tsinghua University
Current assignee: Shenzhen Research Institute Tsinghua University
Priority date: 2018-07-02
Filing date: 2018-07-02
Publication date: 2021-02-02
Anticipated expiration: 2038-07-02
Also published as: CN108689475A

Abstract

Hair brushThe Fenton oxidation baffled reactor consists of a medicament mixing area, a baffled reaction area and four pipeline interfaces, wherein the medicament mixing area and the baffled reaction area are sequentially arranged from inside to outside by concentric sleeves, a waste water inlet is arranged in the center of the bottom of the medicament mixing area, a series of compressed air interfaces are arranged at the bottom of the reaction area, and a water outlet and an air outlet are arranged at the position far away from the center of the medicament mixing area. The organic wastewater treatment method comprises the following steps: after the wastewater is filtered and the pH value is adjusted, FeSO is quantitatively added into a water inlet pipeline by a metering pump through an ejector in sequence₄Solution and H₂O₂The solution enters the reactor, the aeration device is started, the mixed wastewater enters the medicament mixing area in a tangential feeding mode, and under the action of the stirring motor, the mixed wastewater flows upwards along the inner wall of the cylinder in a spiral winding mode, and the fin baffle further aggravates the disturbance and turbulence of the wastewater and promotes the uniform mixing of the wastewater and the medicament; in the baffled reaction zone, the mixed wastewater passes through in a plug flow mode, and undergoes a rapid Fenton reaction and flows out of the reactor through an overflow weir.

Description

Fenton oxidation baffled reactor and organic wastewater treatment method

Technical Field

The invention belongs to organic wastewater treatment equipment, and particularly relates to a Fenton oxidation baffled reactor and an organic wastewater treatment method.

Background

The Fenton oxidation technology is used as an advanced oxidation technology, can effectively degrade organic matters, and is widely applied to the pretreatment of industrial sewage and the advanced treatment of biochemical tail water. The basic principle is that under the proper pH condition, Fe is utilized₂+ catalytic action, H₂O₂Generating hydroxyl free radical (OH) with high reactivity, and the OH can react with most organic matters to degrade the organic matters, and Fe generated by Fenton reaction₃+ produces the coagulating sedimentation, can get rid of a large amount of organic matters to effectively reduce COD in the waste water, traditional fenton reaction tank, the medicament mainly relies on the manual work to be thrown, and it is poor to mix the effect, and the medicament utilization ratio is low, and reaction rate is uncontrollable, and reaction time is more than several hours, seriously influences the treatment effeciency, and the cost of labor is high. The technology of controlling Fenton reaction time and improving medicament utilization rate is an urgent need to be solved. .

In order to further improve the processing efficiency of the fenton technology, technology-like fenton technologies such as electro-fenton, ultraviolet light-fenton, ultrasonic wave-fenton and the like are proposed through technical coupling. The Fenton-like technology can promote the generation of hydroxyl radicals in the wastewater under a specific environment by adding different process conditions, so that the reaction rate is accelerated, but each technology is greatly influenced by the quality of the wastewater, for example, ultraviolet light is sensitive to the chromaticity and turbidity of the wastewater, and the technology has low efficiency of light energy or electric energy conversion, high energy consumption and long retention time, so that the application and popularization of the technology are limited.

In addition, from the structural consideration of the fenton reactor, the water inlet pipeline is sprayed into by the most of the fenton agents through the ejector matched with the metering pump, then the materials are mixed through one-stage or multi-stage static mixers of different types, the mixing effect is considerable, but the problem of scaling and further blocking of the static mixers can occur after the static mixers are operated for a period of time, the continuous production is not facilitated, the pipeline resistance can be increased after the static mixers are scaled, the load of the water inlet pump is increased, and the service life of the pump is shortened.

CN201410263905.8 discloses a reactor for liquid-solid two-phase continuous reaction and on-line separation. The technical problem to be solved is to provide a reactor for liquid-solid two-phase continuous reaction and online separation aiming at the problem that the existing liquid-solid reactor can not simultaneously meet the treatment requirements of sufficient stop time, narrow residence time distribution, online separation, continuity and large scale. The technical scheme is as follows: the reactor is divided into an upper part and a lower part, wherein the upper part is a baffled continuous reactor, and the lower part is an online separator. A rotating shaft which is communicated up and down is arranged in the reactor cylinder, and the multi-stage movable flow deflectors and the multi-stage static flow deflectors are alternately arranged to form a reaction liquid baffling channel together; the movable flow deflector is provided with stirring blades; the on-line separator comprises a filter screen, a conical spiral, a filtrate tank, a circulating filtrate outlet and a filter cake outlet; the reaction liquid enters the reactor, is continuously baffled in a plug flow mode under the action of self gravity, and is stirred and mixed on the movable guide vane until the reaction is finished. The reactor realizes the organic coupling of reaction and separation, and the stirring blades on the dynamic and static flow deflectors and the dynamic flow deflectors are mutually matched to realize the plug flow reaction and the full mixing of reaction liquid; the online separation and removal of the products effectively reduce the conversion of heat-sensitive products and are beneficial to the movement of an equilibrium reaction system to the direction of the products, thereby improving the yield of the products. The disadvantages are that: when the water flows along the gravity direction, the back mixing degree of the water flow is relatively larger than the flow of the water flow vertical to the gravity direction, so that the residence time distribution is wider, and the quick reaction is not facilitated; in addition, if the movable guide vane or the static guide vane forms a certain angle with the horizontal direction, solid or floc can be accumulated at the position of the movable guide vane close to the spiral shaft or the position of the static guide vane close to the inner wall of the reactor, and although the reactor is not blocked, the solid is not easy to remove.

Disclosure of Invention

Aiming at the defects of the prior art and equipment, the technical scheme of the invention is to provide a Fenton oxidation baffled reactor which has the advantages of small occupied area, short retention time and high medicament utilization rate. The other technical scheme of the invention is to provide an organic wastewater treatment method of a Fenton oxidation baffled reactor, which can intensify the turbulent flow of the Fenton medicament and wastewater in a medicament mixing zone, thereby ensuring the mixing efficiency of the Fenton medicament and the wastewater, ensuring that the wastewater passes through a reaction zone in a plug flow mode, reducing back mixing to the maximum extent and improving the medicament utilization rate.

The technical scheme of the invention is that the novel Fenton oxidation baffling reactor for treating organic wastewater is characterized in that the reactor consists of a medicament mixing area and a baffling reaction area which are sequentially arranged from inside to outside by concentric sleeves, four pipeline interfaces arranged on the reactor, a wastewater inlet arranged in the central area of the bottom, a series of compressed air interfaces arranged at the bottom of the baffling reaction area, and a water outlet and an air outlet arranged at the position far away from the center. Wherein, the organic wastewater enters the inner cavity of the mixing zone of the reactor from the upper part of the reactor tangentially after being filtered and adjusted in pH by an external pipeline, and after being fully mixed, the organic wastewater rapidly reacts in the baffled reaction zone and finally flows out of the reactor through a water outlet.

Preferably, the method comprises the following steps: the organic wastewater enters the medicament mixing zone through the tangential water inlet in a tangential feeding mode, and the wastewater spirally flows upwards along the inner wall of the cylinder in the medicament mixing zone to facilitate mixing.

Preferably, the method comprises the following steps: be equipped with agitating unit in the medicament mixing area, the drum inner wall is equipped with a series of fin baffles, and the mixed liquid of organic waste water and medicament upwards spirals around the flow fast along the drum inner wall, and the fin baffle further aggravates the turbulent motion degree of waste water, promotes the homogeneous mixing of waste water and medicament.

Preferably, the method comprises the following steps: the baffling formula reaction area is equipped with a plurality of concentric sleeves, and the hanging wall at sleeve cavity top sets firmly a baffling section of thick bamboo, and the lower wall of sleeve cavity bottom sets firmly down a baffling section of thick bamboo, go up a baffling section of thick bamboo with horizontal space between the lower wall go up a baffling section of thick bamboo with vertical space between the baffling section of thick bamboo down a baffling section of thick bamboo with horizontal space between the hanging wall has constituted the water channel of baffling formula reaction area jointly.

Preferably, the method comprises the following steps: the water passing channel of the baffling type reaction zone adopts a uniform cross section design so as to ensure that waste water passes through the reaction zone in a plug flow mode, reduce back mixing to the maximum extent and improve the medicament utilization rate.

Preferably, the method comprises the following steps: a plurality of aeration pipes are arranged at the bottom of the baffled reaction area, so that liquid disturbance is intensified through aeration, and the mixing and reaction of the Fenton medicament and the wastewater are further promoted; meanwhile, the eddy formed by aeration can take away flocs or particles generated by Fenton reaction in time, so that the accumulation of the flocs or particles in a reaction area is reduced, and the risk of equipment blockage is reduced.

Preferably, the method comprises the following steps: the upper edge of a baffling cylinder on the baffling type reaction zone is uniformly provided with small holes, and the top of the upper disc is provided with a gas release valve, so that gas generated by reaction can be discharged in time, gas accumulation is prevented, and a flow dead zone is reduced.

Preferably, the method comprises the following steps: the reactor is 400-2000 mm in diameter, 100-1000 mm in height, 0.1-1 in height-diameter ratio and 2-20 in number of upper and lower baffling cylinder groups.

The other technical scheme of the invention is that the organic wastewater treatment method of the Fenton oxidation baffled reactor is characterized in that after the organic wastewater is filtered and the pH value is adjusted, FeSO is quantitatively added into a water inlet pipeline sequentially through a metering pump and an ejector₄Solution and H₂O₂And (3) the solution enters a baffling reactor, an aeration device and a stirring device are started simultaneously, and the volume flow ratio of gas to water is 0.1: 1-10: 1, the stirring speed of the motor is 10 ℃300RPM, in a baffled reaction zone, the mixed wastewater passes through in a plug flow manner and undergoes a rapid Fenton reaction, and flows out of the reactor through an overflow weir.

Preferably, the method comprises the following steps: the organic wastewater and the Fenton medicament flow into a medicament mixing zone of the reactor at a high speed through a tangential feed inlet, a stirring motor and an aeration device are started, the organic wastewater and the Fenton medicament are quickly mixed in the zone and then enter a baffling type reaction zone, a horizontal gap between an upper baffling cylinder and a lower disc, a vertical gap between the upper baffling cylinder and a lower baffling cylinder and a horizontal gap between the lower baffling cylinder and an upper disc jointly form an annular gap baffling type channel, the organic wastewater and the Fenton medicament flow from inside to outside in a flat plug flow type and quickly react, and the wastewater after full Fenton reaction flows out from a water outlet on the side face of the reactor after passing through an overflow weir; the gas generated by the reaction and the aeration gas are converged at the top of the reactor, flow through the series of small holes on the upper baffling cylinder from inside to outside, and are discharged into the atmosphere from the exhaust pipe.

Compared with the prior art, the invention has the beneficial effects that:

the mode that the wastewater enters the medicament mixing zone is tangential feeding, and the wastewater spirally flows upwards along the inner wall of the cylinder in the medicament mixing zone, so that the wastewater is beneficial to mixing.

The series of fin baffles are arranged on the inner wall of the cylinder, so that the turbulence degree of the wastewater can be increased, and the mixing effect is improved.

According to the invention, the inner cavity of the reactor is used as a main mixing area of the Fenton medicament and the wastewater, the traditional static mixer is replaced, the Reynolds number of the mixed wastewater can be adjusted to be equal to or even higher than that of the static mixer by adding the stirring motor, the mixing time is adjusted through the volume of the mixing area, and the mixing effect is ensured.

The inner cavity of the reactor is used as a main mixing area of the Fenton agent and the wastewater, the cross section of the flow channel is larger, and compared with a traditional pipeline mixer, the problems of scaling and pipeline blockage can be effectively solved.

Compared with the traditional tubular mixing, the pipeline resistance is lower, so that the pressure head of the water inlet pump can be reduced, and the energy consumption is reduced.

Sixthly, the uniform cross section design of the baffled reaction area ensures that the mixed wastewater flows in a plug flow mode, back mixing can be reduced to the maximum extent, the reaction can be ensured to be always carried out at a high speed for the Fenton quick reaction, the utilization rate of the medicament is improved, the retention time is shortened, and the occupied area of the whole device is further saved. The residence time of the traditional Fenton reaction tank is generally more than 4 hours, other Fenton-like processes are also different within 1-2 hours, the residence time of the reactor can be controlled within 10-15 minutes, and the Fenton treatment efficiency is greatly improved.

The eddy formed by aeration of the invention can take away flocs or particles generated by Fenton reaction in time, reduce the accumulation of the flocs or particles in a reaction zone and reduce the risk of equipment blockage.

And the top of the upper disc is provided with the air release valve, so that gas generated by reaction can be discharged in time, gas accumulation is prevented, and a flow dead zone is reduced.

The reactor of the invention has small occupied area, short retention time, high medicament utilization rate and larger application prospect.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a top view of the present invention.

Description of the main component symbols:

11 fin baffle plates 12 tangential water inlets 13 of stirring device in medicament mixing area 1

Overflow weir 14 drain 15 exhaust pipe 16 baffled reaction zone 2

Upper disc 21 upper baffle cylinder 22 small hole 221 lower disc 23

Air inlet pipe 31 of air release valve 26 of aeration pipe 25 of lower deflection cylinder 24

First storage tank 321 metering pump 322 first ejector 323 pH probe 324

Second reservoir 325 second ejector 326 third reservoir 327

Detailed Description

The invention will be further described in detail with reference to the accompanying drawings:

referring to fig. 1 and 2, the fenton oxidation baffled reactor of the present invention comprises a chemical mixing zone 1 and a baffled reaction zone 2, which are sequentially disposed from inside to outside.

In the embodiment, an electric stirring device 11 is arranged in the medicament mixing area 1, and a series of fin baffles 12 are arranged on the inner wall of the cylinder of the reactor, so that the turbulence degree of the wastewater can be increased, and the mixing effect is improved; the waste water enters the medicament mixing zone 1 through the tangential water inlet 13 in a tangential feeding mode, and the waste water spirally flows upwards along the inner wall of the cylinder in the medicament mixing zone 1 to facilitate mixing.

In this embodiment, the baffling reaction area 2 is provided with a plurality of concentric sleeves, the upper disc 21 at the top of the sleeve cavity is fixedly provided with an upper baffling cylinder 22, the lower disc 23 at the bottom of the sleeve cavity is fixedly provided with a lower baffling cylinder 24, the upper baffling cylinder 22 and the lower baffling cylinder 24 are alternately distributed in the baffling reaction area, and the horizontal gap between the upper baffling cylinder 22 and the lower disc 23, the vertical gap between the upper baffling cylinder 22 and the lower baffling cylinder 24, and the horizontal gap between the lower baffling cylinder 24 and the upper disc 21 jointly form a water passing channel of the baffling reaction area. The water passing channel of the baffling type reaction zone 2 adopts a uniform cross section design so as to ensure that the wastewater passes through the reaction zone in a plug flow mode, reduce back mixing to the maximum extent and improve the medicament utilization rate. A plurality of aeration pipes 25 are arranged at the bottom of the baffled reaction area 2, so that liquid disturbance is intensified through aeration, and the mixing and reaction of the Fenton medicament and the wastewater are further promoted; meanwhile, the eddy formed by aeration can take away flocs or particles generated by Fenton reaction in time, so that the accumulation of the flocs or particles in a reaction area is reduced, and the risk of equipment blockage is reduced. In this embodiment, the small holes 221 are uniformly arranged on the upper edge of the deflection cylinder 22 in the deflection reaction zone 2, and the top of the upper plate 21 is provided with the air release valve 26, so that the gas generated by the reaction can be discharged in time, the gas accumulation can be prevented, and the flow dead zone can be reduced. The outermost ring of the baffled reaction zone 11 is provided with an overflow weir 14, and the treated wastewater overflows and flows out of the reactor through a lateral water outlet 15.

In the embodiment, the diameter of the cylindrical reactor is 400-2000 mm, the height is 100-1000 mm, the height-diameter ratio is 0.1-1, and the number of the upper and lower baffling cylinder groups is 2-20.

Referring to fig. 1, raw water from a plant enters a system through a water inlet pipe 31, dilute acid (or liquid caustic soda) in a first storage tank 321 is injected into a first jet device 323 through a metering pump 322, the pH of wastewater is adjusted to 3-4, a pH probe 324 detects the adjusted pH value, and the acid (or caustic soda) adding rate of the metering pump 322 is controlled in an interlocking manner; FeSO in the second storage tank 325₄The solution is quantitatively fed into the main pipeline and the H in the third storage tank 327 through the second ejector 326 by the metering pump 322₂O₂The solution is quantitatively fed into the main pipeline through the third jet 8 by the metering pump 322, and the Fenton medicament is added. Wastewater and Fenton reagent flow into a reagent mixing zone 1 of the reactor at high speed through a tangential water inlet 13, a stirring device 11 and an aeration pipe 25 are started, the wastewater and the Fenton reagent are quickly mixed in the zone and then enter a baffled reaction zone 11, in an annular gap baffled channel formed by an upper disc 21, a lower disc 23, an upper baffled cylinder 22 and a lower baffled cylinder 24, the wastewater and the Fenton reagent flow from inside to outside in a plug flow mode and quickly react, and the wastewater after full Fenton reaction flows out from a water outlet 15 on the side surface of the reactor after passing through an overflow weir 14; the gas generated by the reaction and the aeration gas are collected at the top of the reactor, flow through a series of small holes 221 on the upper deflection cylinder 13 from inside to outside, and are discharged into the atmosphere from the exhaust pipe 17.

Referring to fig. 1 and 2, the method for treating organic wastewater in a fenton oxidation baffled reactor of the present invention includes filtering and adjusting pH of the organic wastewater, and quantitatively adding FeSO to a water inlet pipeline sequentially through a metering pump and a jet device₄Solution and H₂O₂The solution enters a baffling type reactor, organic wastewater and Fenton medicament flow into a medicament mixing area of the reactor through a tangential feed inlet at a high speed, a stirring motor and an aeration device are started, and the volume flow ratio of air to water is 0.1: 1-10: 1, the stirring speed of a motor is 10-300 RPM, the organic wastewater and the Fenton chemical are quickly mixed in the area and then enter a baffling reaction area 2, and in an annular-gap baffling channel formed by a horizontal gap between an upper baffling cylinder 22 and a lower disc 23, a vertical gap between the upper baffling cylinder 22 and a lower baffling cylinder 24 and a horizontal gap between the lower baffling cylinder 24 and an upper disc 21, the organic wastewater and the Fenton chemical are separated in a flat plug flow modeThe wastewater flows inwards and outwards to react quickly, and the wastewater after the full Fenton reaction flows out from a water outlet on the side surface of the reactor after passing through an overflow weir; the gas generated by the reaction and the aeration gas are collected at the top of the reactor, flow through the series of small holes 221 on the upper deflection cylinder 22 from inside to outside, and are exhausted into the atmosphere from the exhaust pipe.

Example 1:

the flow rate of the organic wastewater is 0.2m3/h, the CODCr is 3620mg/L, the size of the designed deflection reactor is phi 500 x 120mm, 8 groups of upper and lower deflection cylinders are arranged in the deflection reactor, the gas-water ratio is 3:1, the stirring speed of a motor is 50RPM, and the FeSO₄The solution (Fe2+ molar concentration is 1.42mol/L) is added in 13.6L/H, H₂O₂The solution (27.5%, w/w) was dosed at 4L/h, after treatment the CODCr was reduced from 3620mg/L to 500 mg/L.

Example 2:

the flow rate of the organic wastewater is 1m3/h, the CODCr is 8050mg/L, the size of the designed deflection reactor is phi 900 multiplied by 200mm, five groups of upper and

lower deflection cylinders

22 and 24 are arranged inside the deflection reactor, the volume ratio of air to water is 10:1, the stirring speed of a motor is 100RPM, and FeSO₄The solution (Fe2+ molar concentration 1.42mol/L) was added at 44.4L/H and the H2O2 solution (27.5%, w/w) was added at 20L/H, after treatment the CODCr was reduced from 8050mg/L to 2100 mg/L.

Example 3:

the flow rate of the organic wastewater is 4.2m3/h, the CODCr is 12000mg/L, the size of the designed deflection reactor is phi 1200 multiplied by 900mm, 10 groups of upper and lower deflection cylinders are arranged in the deflection reactor, the volume ratio of air to water is 8:1, the stirring speed of a motor is 250RPM, and the FeSO₄Solution (Fe)₂+ molarity 1.42mol/L) was 185L/H, H2O2 solution (27.5%, w/w) was 105L/H, and CODCr was reduced from 12000mg/L to 4800mg/L after treatment.

The above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims

1. A Fenton oxidation baffling type reactor for treating organic wastewater is characterized in that a medicament mixing area and a baffling type reaction area are sequentially arranged on the reactor from inside to outside through a concentric sleeve, the reactor is provided with four pipeline interfaces, a wastewater inlet is arranged in the central area of the bottom of the reactor, a series of compressed air interfaces are arranged at the bottom of the baffling type reaction area, and a water outlet and an air outlet are arranged at the position far away from the center of the reactor; the device is characterized in that the baffling reaction zone is provided with a plurality of concentric sleeves, an upper disc at the top of a sleeve cavity is fixedly provided with an upper baffling cylinder, a lower disc at the bottom of the sleeve cavity is fixedly provided with a lower baffling cylinder, and the upper baffling cylinder and the lower baffling cylinder are alternately distributed in the reaction zone; a horizontal gap between the upper deflection cylinder and the lower disc, a vertical gap between the upper deflection cylinder and the lower deflection cylinder, and a horizontal gap between the lower deflection cylinder and the upper disc jointly form a water passing channel of the deflection reaction zone; the water passing channel adopts a uniform cross-section design so as to ensure that the wastewater passes through the reaction zone in a plug flow mode, thereby reducing back mixing to the maximum extent and improving the utilization rate of the medicament; organic wastewater enters the medicament mixing zone through the tangential water inlet in a tangential feeding mode, and the wastewater spirally flows upwards along the inner wall of the cylinder in the medicament mixing zone to facilitate mixing; the upper edge of the baffling cylinder on the baffling reaction zone is uniformly provided with small holes, and the top of the upper disc is provided with a vent valve, so that gas generated by reaction can be discharged in time, gas accumulation is prevented, and a flow dead zone is reduced.

2. A fenton's oxidation baffled reactor according to claim 1, characterized in that a stirring device is arranged in the chemical mixing area, a series of fin baffles are arranged on the inner wall of the cylinder, the mixed liquid of the organic wastewater and the chemical flows upwards along the inner wall of the cylinder in a spiral and rapid manner, and the fin baffles further increase the turbulence degree of the wastewater and promote the uniform mixing of the wastewater and the chemical.

3. A fenton oxidation baffled reactor according to claim 1, wherein a plurality of aeration pipes are arranged at the bottom of the baffled reaction zone, and liquid disturbance is intensified through aeration so as to further promote the mixing and reaction of the fenton chemical and the wastewater; meanwhile, the eddy formed by aeration can take away flocs or particles generated by Fenton reaction in time, so that the accumulation of the flocs or particles in a reaction area is reduced, and the risk of equipment blockage is reduced.

4. A Fenton's oxidation baffled reactor according to claim 1, characterized in that the diameter of the reactor is 400-2000 mm, the height is 100-1000 mm, the height-diameter ratio is 0.1-1, and the number of upper and lower baffled cylinder groups is 2-20.

5. A method for treating organic wastewater in a Fenton oxidation baffled reactor according to claim 1, wherein after the organic wastewater is filtered and the pH value is adjusted, FeSO is quantitatively added into a water inlet pipeline sequentially through a metering pump and a jet device₄Solution and H₂O₂And (3) the solution enters a baffling reactor, an aeration device and a stirring device are started simultaneously, and the volume flow ratio of gas to water is 0.1: 1-10: 1, motor stirring speed is 10 ~ 300RPM, and in baffling formula reaction zone, mixed waste water passes through with the type of plug flow to carry out quick fenton reaction, flow out the reactor through the overflow weir.

6. A Fenton's oxidation baffled reactor organic wastewater treatment method according to claim 5, characterized in that a storage tank is arranged on the metering pump and is communicated with the metering pump, dilute acid or liquid caustic soda arranged in the first storage tank is injected into the first ejector through the metering pump to adjust the pH of the wastewater to 3-4, a pH probe arranged between the first ejector and the second ejector detects the adjusted pH value, and the acid adding or caustic adding rate of the metering pump is interlocked and controlled; FeSO in the second storage tank₄The solution is quantitatively fed into the main pipeline through a first metering pump and a second ejector, and H in a third storage tank₂O₂And adding the solution into the main pipeline by a second metering pump through a third jet according to a set amount, and finishing the addition of the Fenton medicament.

7. The method of claim 5, wherein the organic wastewater and the Fenton chemical are fed into the chemical mixing zone of the reactor through the tangential feed inlet at a high speed, the stirring motor and the aeration device are started, and the organic wastewater and the Fenton chemical are rapidly mixed in the zone and then fed into the baffled reaction zone, and in an annular baffled passage formed by a horizontal gap between the upper baffled cylinder and the lower plate, a vertical gap between the upper baffled cylinder and the lower baffled cylinder, and a horizontal gap between the lower baffled cylinder and the upper plate, the organic wastewater and the Fenton chemical flow from inside to outside in a plug flow manner, and are rapidly reacted, and the wastewater after the full Fenton reaction flows out from the water outlet on the side of the reactor through the overflow weir; the gas generated by the reaction and the aeration gas are converged at the top of the reactor, flow through the series of small holes on the upper baffling cylinder from inside to outside, and are discharged into the atmosphere from the exhaust pipe.