A system and method for treating wastewater by Fenton oxidation during electrolysis

Abstract

The present invention provides a system for treating wastewater by Fenton oxidation during electrolysis, comprising a reaction chamber (10) and a sedimentation tank (20), wherein an opening (101) and a sealing cover (11) are arranged on the upper end surface of the reaction chamber; the sealing cover (11) is provided with a first motor (12), the first motor (12) is provided with a rotating rod (13), and the rotating rod (13) passes through the sealing cover (11); the inner wall of the sealing cover (11) is slidably connected to a gear ring (14), and a positioning plate (15) is arranged on the inner wall of the gear ring (14), a gear assembly is arranged on the lower side of the positioning plate (15), and the rotating rod (13) passes through the positioning plate (15) and the gear assembly in sequence; three positioning rods (142) are arranged on the gear ring (14), and a graphite rod (1421), a combination rod (1422), and a zinc rod (1423) are arranged at the bottom of the positioning rod (142). The system can efficiently utilize H2O2 and recycle Fe 2+ , thereby effectively saving material costs, avoiding secondary pollution, improving wastewater treatment efficiency, and increasing the continuity of wastewater treatment.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a system and method for treating wastewater by Fenton oxidation during electrolysis. Background Art

[0002] With the acceleration of my country's industrialization and urbanization, the trend of water pollution is becoming increasingly serious; water pollution not only reduces the amount of available water resources and aggravates the contradiction of water shortage, but also easily affects the drinking water safety of humans, animals and plants and threatens their health.

[0003] The biodegradable organic matter in sewage is difficult to treat and has great harm, which is one of the main problems faced in the current sewage treatment process. 2+ Under the catalytic action of , highly reactive hydroxyl radicals (·OH) are generated. Hydroxyl radicals can react with most organic matter to degrade them, thereby effectively removing organic matter from wastewater. The Fenton oxidation method can oxidize a variety of organic matter and the system does not require high temperature and high pressure, and does not require a large amount of energy consumption. It has a good oxidation effect on most alcohols, ketones, esters, etc. Therefore, it is currently a catalytic oxidation method that is widely used in wastewater treatment. However, in the traditional Fenton oxidation method, Fe as a catalyst 2+ Oxidized and loses electrons to generate Fe 3+ , Fe 3+ Reduction to Fe 2+ The reaction efficiency is low, Fe 2+ The regeneration reaction becomes inert and difficult to occur, and Fe cannot be effectively recycled. 2+ , thus requiring multiple additions of Fe 2+ Inorganic salts (such as FeSO4) increase the cost of processing materials and easily cause secondary pollution (such as excessive iron mud produced during oxidation, and Fe 2+ Inorganic salts, other ions are difficult to remove in water); in addition, repeated addition of Fe 2+ Inorganic salts affect the continuity of wastewater treatment and are not conducive to continuous and efficient wastewater treatment. Summary of the invention

[0004] In view of the above problems in the prior art, the present invention aims to provide a system for treating wastewater by Fenton oxidation during electrolysis, which can efficiently utilize H2O2 and recycle Fe 2+ , thereby effectively saving material costs, avoiding secondary pollution, improving wastewater treatment efficiency, and increasing the continuity of wastewater treatment.

[0005] Another object of the present invention is to provide a method for treating wastewater by Fenton oxidation during electrolysis, which is used to match the above-mentioned system.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A system for treating wastewater by Fenton oxidation during electrolysis, characterized in that: it comprises a reaction chamber and a sedimentation tank, an opening is arranged on the upper end surface of the reaction chamber, and a sealing cover with an "n"-shaped cross section is arranged on the outer ring of the opening; a first motor is arranged on the end surface of the sealing cover, the output shaft of the first motor is fixedly connected to a rotating rod, and the rotating rod penetrates the sealing cover and is rotatably connected to the bottom surface of the reaction chamber; a gear ring with internal teeth is slidably connected to the inner wall of the sealing cover, and a positioning plate is arranged on the upper end of the inner wall of the gear ring (i.e., the upper side of the inner teeth), the outer wall of the positioning plate is rotatably connected to the inner wall of the gear ring, and the upper end of the positioning plate is connected to the sealing cover. The gear ring is connected to the electric telescopic rod through a spring; a gear assembly for driving the gear ring to rotate is arranged at the lower side of the positioning plate, and the rotating rod passes through the positioning plate and the gear assembly in sequence; three positioning rods are distributed on the gear ring in a planetary gear style around the central axis, the three positioning rods respectively pass through the gear ring and graphite rods, combination rods and zinc rods are arranged at their bottom ends respectively, the core shaft of the combination rod is a graphite layer, and the outer ring is an iron plating layer, and an aeration device is arranged on the bottom surface of the reaction chamber corresponding to the graphite rod; conductive seats are respectively arranged at the top end of the inner side of the sealing cover corresponding to two of the positioning rods, and the positioning rods can be clamped in the corresponding conductive seats.

[0008] For further optimization, a sewage inlet pipe is arranged on one side of the reaction chamber, and a feed pipe is arranged on the other side.

[0009] For further optimization, an arc-shaped slide plate is provided on the inner wall of the reaction chamber, and a through hole is provided on the arc-shaped slide plate corresponding to the sewage inlet pipe, and the outer wall of the arc-shaped slide plate is slidably connected to the inner wall of the reaction chamber; the arc-shaped slide plate is fixedly connected to the bottom surface of the gear ring through an arc-shaped connecting block, the arc-shaped connecting block is located on the outer ring of the graphite rod, the combination rod and the zinc rod, and an arc-shaped slide groove is provided on the top surface of the reaction chamber corresponding to the arc-shaped connecting block; the closing and opening of the sewage inlet pipe mouth during the rotation of the gear ring are realized through the cooperation of the arc-shaped slide plate and the arc-shaped connecting block, thereby realizing the control of the sewage intake amount.

[0010] For further optimization, multiple sliding blocks are evenly arranged on the outer ring of the gear ring and around its axis, a vertical sliding groove is arranged on the inner wall of the sealing cover corresponding to the sliding block and a first annular sliding groove is arranged at the bottom of the vertical sliding groove, multiple vertical sliding grooves are connected with the same annular sliding groove, the sliding block is inserted into the corresponding vertical sliding groove and slidably connected, and the sliding block can slide in the annular sliding groove, thereby realizing the up and down sliding and relative rotation of the gear ring in the sealing cover.

[0011] For further optimization, the outer ring of the positioning plate is evenly provided with multiple rotating blocks around its axis, and the end of the rotating block away from the positioning plate is set to a spherical structure, the inner ring of the gear ring and the upper end of the inner teeth are provided with a second annular groove, and the end of the rotating block away from the positioning plate (i.e., the spherical structure head) is stuck in the second annular groove and slidably connected, thereby realizing the relative rotation between the positioning plate and the gear ring and ensuring that the positioning plate and the gear ring slide up and down at the same time.

[0012] For further optimization, the electric telescopic rod is evenly distributed around the central axis of the positioning plate, the spring is evenly distributed around the central axis of the positioning plate, and the spring has two circles, which are respectively located in the inner circle and the outer circle of the electric telescopic rod.

[0013] For further optimization, the gear assembly includes a driving gear and three driven gears. The driving gear is sleeved on the outer wall of the rotating rod and is suspended on the bottom surface of the positioning plate through a hanging rod. A spline hole is opened in the middle of the driving gear; the outer ring of the driving gear and three driven gears are evenly distributed around its axis. The driven gear is rotatably connected to the bottom surface of the positioning plate through a rotating shaft and the driven gears are respectively meshed with the driving gear and the inner teeth of the gear ring; the rotating rod is located on the outer ring of the lower side of the driving gear and a spline sleeve is arranged corresponding to the spline hole.

[0014] For further optimization, the central axes of the rotating rod, the gear ring, the positioning plate, the driving gear, and the sealing cover are collinear.

[0015] For further optimization, an arc-shaped groove is provided on the top surface of the reaction chamber on the inner wall of the opening corresponding to the graphite rod, the combination rod and the zinc rod, so as to limit the graphite rod, the combination rod and the zinc rod.

[0016] For further optimization, the rotating rod is located on the outer wall of the inner cavity of the reaction chamber and a stirring rod is arranged on the inner circle of the graphite rod, the combination rod and the zinc rod.

[0017] For further optimization, the reaction chamber is connected with the sedimentation tank through a connecting pipe, and a control valve is arranged on the connecting pipe; a second motor is arranged on the outer side of the upper end surface of the sedimentation tank, and the output shaft of the second motor passes through the upper end of the sedimentation tank and is located in the inner cavity of the sedimentation tank to connect with the stirring device; an addition port is arranged on the end surface of the sedimentation tank and on one side of the second motor; a water outlet pipe and a sludge pipe are arranged on the side of one side of the sedimentation tank in sequence from top to bottom.

[0018] A method for treating wastewater by Fenton oxidation during electrolysis, characterized in that: the above system is adopted, comprising:

[0019] Step 1: passing the wastewater to be treated through the sewage inlet pipe and simultaneously introducing the H2SO4 solution through the feeding pipe; driving the first motor to complete the mixing of the wastewater and the H2SO4 solution and complete the adjustment of the pH value of the wastewater;

[0020] Step 2: Initially, the positioning rods corresponding to the combination rod and the graphite rod are respectively inserted into the two conductive seats, the two conductive seats are respectively connected to the positive and negative poles of the power supply, and intermittent aeration is performed through the aeration device to complete the Fenton oxidation reaction to degrade organic pollutants;

[0021] Step 3: After a period of degradation (i.e., the iron coating on the outer ring of the assembly rod is completely dissolved), the first motor is paused, and the electric telescopic rod is started to extend so that the spline sleeve is inserted into the spline hole; the first motor is started again, so that the rotating rod drives the gear ring to rotate, and then the graphite rod, the assembly rod and the zinc rod are driven to rotate through the positioning rod, so that the zinc rod and the assembly rod containing only the core shaft correspond to the conductive seat, and then the first motor is paused again, and the electric telescopic rod is started to shorten, so that the zinc rod and the assembly rod are inserted into the conductive seat, and the conductive seat is energized for electrochemical reaction;

[0022] Step 4: Start the gear ring to rotate again, so that the graphite rod, the combination rod and the zinc rod return to the initial position; then continue the Fenton oxidation reaction to degrade the organic pollutants, and replenish the H2SO4 solution in real time to complete the pH value regulation;

[0023] Step 5: Repeat steps 2 to 4 until the organic pollutants in the wastewater are completely degraded;

[0024] Step six, open the connecting pipe, pass the wastewater after the degradation of organic matter in the reaction chamber into the sedimentation tank, add Ba(OH)2 into the sedimentation tank, and start the second motor for stirring; after stirring for a period of time, let it stand and settle, and separate the solid and liquid through the outlet pipe and the sludge pipe in turn.

[0025] The present invention has the following technical effects:

[0026] The present invention realizes the cyclic treatment of Fenton oxidation reaction-electrochemical reaction-Fenton oxidation reaction through the cooperation of the sealing cover, the first motor, the rotating rod, the gear ring, the positioning plate, the gear assembly, the positioning rod, the graphite rod, the combination rod and the zinc rod, thereby completing the conversion of Fe element to Fe 2+ Conversion, from Fe 2+ Convert to Fe 3+ , and then by Fe 3+ Convert to Fe 2+ process, to achieve the catalyst Fe 2+ The reuse of Fe can meet the continuous treatment process of large amounts of wastewater and effectively avoid the repeated addition of Fe 2+ At the same time, through the cycle of Fenton oxidation reaction-electrochemical reaction-Fenton oxidation reaction, H2O2 is produced through intermittent aeration to achieve the continuity of Fenton oxidation reaction, avoiding excessive addition of H2O2 at one time and causing Fe 2+ Oxidized Fe3+ Rapid catalytic decomposition of H2O2, thereby inhibiting the generation of hydroxyl radicals, effectively improving the efficiency of organic matter degradation in wastewater, increasing the yield of hydroxyl radicals and the utilization rate of H2O2, and achieving efficient and full degradation of organic matter in wastewater. In addition, reducing Fe 2+ The use of inorganic salts can effectively avoid the addition of large amounts of inorganic salts (such as FeSO4) that would increase the osmotic pressure of microbial cells in the wastewater, cause the protoplasm separation of microbial cells, and inhibit the growth and enzymatic action of microorganisms in the wastewater.

[0027] The present application has high efficiency, low cost and strong continuity in degrading organic matter in wastewater, can be applied to the treatment of various wastewaters, and is more economical and effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the structure of a wastewater treatment system in an embodiment of the present invention.

[0029] Figure 2 for Figure 1 A partial enlarged view of middle A.

[0030] Figure 3 for Figure 1 BB section view.

[0031] Figure 4 for Figure 1 CC section view.

[0032] Figure 5 for Figure 1 DD section view.

[0033] Figure 6 for Figure 1 EE section view.

[0034] Among them, 10, reaction chamber; 100, connecting pipe; 101, opening; 1010, arc-shaped slot; 102, sewage inlet pipe; 103, feeding pipe; 104, aeration device; 105, arc-shaped slide; 11, sealing cover; 111, vertical slide; 112, first annular slide; 113, conductive seat; 12, first motor; 13, rotating rod; 131, spline sleeve; 132, stirring rod; 14, gear ring; 141, sliding block; 142, positioning rod; 1421, graphite rod; 1422, combination rod; 14221 , graphite layer; 14222, iron-plated layer; 1423, zinc rod; 143, arc-shaped connecting block; 1430, arc-shaped slider; 14300, through hole; 144, second annular slide; 15, positioning plate; 151, spring; 152, electric telescopic rod; 153, rotating block; 161, driving gear; 1611, spline hole; 1612, suspension rod; 162, driven gear; 1620, rotating shaft; 20, sedimentation tank; 21, second motor; 210, stirring device; 22, addition port; 23, water outlet pipe; 24, sludge pipe. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] Embodiment 1:

[0037] like Figures 1 to 6 As shown: A system for treating wastewater by Fenton oxidation during electrolysis, characterized in that it includes a reaction chamber 10 and a sedimentation tank 20, the reaction chamber 10 and the sedimentation tank 20 are connected through a connecting pipe 100, a control valve is arranged on the connecting pipe 100, and when necessary, a suction pump can also be arranged on the connecting pipe 100 to pump the treated wastewater in the reaction chamber 10 into the sedimentation tank 20 for further treatment.

[0038] A sewage inlet pipe 102 is provided on one side of the reaction chamber 10, and a feed pipe 103 (such as Figure 1 As shown: a sewage inlet pipe 102 is arranged in the middle of the left side of the reaction chamber 10, and a feed pipe 103 is arranged at the top of the right side). An opening 101 is arranged on the upper end surface of the reaction chamber 10, and a sealing cover 11 with an "n"-shaped cross section is arranged on the outer circle of the opening 101 (the bottom of the sealing cover 11 is sealed and fixedly connected to the top surface of the reaction chamber 10 located on the outer circle of the opening 101, as shown in FIG. Figure 1As shown); a first motor 12 is arranged on the end surface of the sealing cover 11 through a motor support seat, and the output shaft of the first motor 12 is fixedly connected to a rotating rod 13 through a coupling, and the rotating rod 13 penetrates the sealing cover 11 and is rotatably connected to the bottom surface of the inner cavity of the reaction chamber 10; a gear ring 14 with internal teeth is slidably connected to the inner wall of the sealing cover 11, and a positioning plate 15 is arranged on the upper end of the inner wall of the gear ring 14 (i.e., the upper side of the inner teeth), the outer wall of the positioning plate 15 is rotatably connected to the inner wall of the gear ring 14, and the upper end of the positioning plate 15 and the sealing cover 11 are connected to the electric telescopic rod 152 through a spring 151; as shown Figure 1 , Figure 2 As shown: That is, a plurality of sliding blocks 141 are evenly arranged on the outer ring of the gear ring 14 and around its axis (the number of the sliding blocks 141 is a multiple of 3, such as Figure 4 12 as shown), a vertical slide groove 111 is provided on the inner wall of the sealing cover 11 corresponding to the sliding block 141, and a first annular slide groove 112 is provided at the bottom of the vertical slide groove 111, and multiple vertical slide grooves 112 are connected to the same annular slide groove 111, and the sliding block 141 is inserted into the corresponding vertical slide groove 111 and slidably connected, and the sliding block 141 can slide in the annular slide groove 112, thereby realizing the up and down sliding and relative rotation of the gear ring 14 in the sealing cover 11; the outer ring of the positioning plate 15 is evenly provided with multiple rotating blocks 153 (such as Figure 3 As shown: the number of rotating blocks 153 is 8) and the end of the rotating block 153 away from the positioning plate 15 is set to a spherical structure, the inner circle of the gear ring 14 and the upper end of the inner teeth are provided with a second annular groove 144, and the end of the rotating block 153 away from the positioning plate 15 (i.e., the spherical structure head) is stuck in the second annular groove 144 and slidably connected, thereby realizing the relative rotation between the positioning plate 15 and the gear ring 14 and ensuring that the positioning plate 15 and the gear ring 14 slide up and down at the same time; the electric telescopic rod 152 is evenly distributed around the central axis of the positioning plate 15, and the spring 151 is evenly distributed around the central axis of the positioning plate 15 and the spring 151 is two circles, which are respectively located in the inner circle and the outer circle of the electric telescopic rod 152.

[0039] A gear assembly for driving the gear ring 14 to rotate is arranged at the lower side of the positioning plate 15, and the rotating rod 13 sequentially penetrates the positioning plate 15 and the gear assembly; the gear assembly includes a driving gear 161 and three driven gears 162, the driving gear 161 is sleeved on the outer wall of the rotating rod 13 and the driving gear 161 is suspended on the bottom surface of the positioning plate 15 through a suspension rod 1612 (that is, the positioning plate 15 is located on the bottom surface of the outer ring of the rotating rod 13 to open a third annular groove, and a plurality of suspension rods 1612 are evenly arranged on the top of the driving gear 161 and around its axis, and the suspension rod 16 The end of 12 away from the driving gear 161 is inserted into the third annular slot and slidably connected, so that the driving gear 161 is hoisted on the lower side of the positioning plate 15 and the driving gear 161 can rotate relative to the positioning plate 15). A spline hole 1611 is provided in the middle of the driving gear 161; three driven gears 162 are evenly distributed on the outer ring of the driving gear 161 and around its axis. The driven gear 162 is rotatably connected to the bottom surface of the positioning plate 15 through the rotating shaft 162 and the driven gear 162 is respectively meshed with the driving gear 161 and the inner teeth of the gear ring 14 (such as Figure 4 As shown); the rotating rod 13 is located at the outer ring of the lower side of the driving gear 161 and a spline sleeve 131 is provided corresponding to the spline hole 1611. Three positioning rods 142 are distributed on the gear ring 14 and around the central axis thereof in a planetary gear type. The three positioning rods 142 respectively penetrate the gear ring 14 and a graphite rod 1421, a combination rod 1422 and a zinc rod 1423 are provided at their bottom ends respectively. The core shaft of the combination rod 1422 is a graphite layer 14221 and the outer ring is an iron plating layer 14222. An aeration device 104 is provided on the bottom surface of the inner cavity of the reaction chamber 10 corresponding to the graphite rod 1421; the inner top end of the sealing cover 11 corresponds to the graphite rod 1421; The two middle positioning rods 142 (initially, the positioning rods 142 corresponding to the graphite rod 1421 and the combination rod 1422) are respectively provided with conductive seats 113, and the positioning rods 142 (top end) can be snapped into the corresponding conductive seats 113 (and the positioning rods 142 are made of conductive material, and the connection between the gear ring 14 and the positioning rods 142 is made of insulating material); the central axes of the rotating rod 13, the gear ring 14, the positioning plate 15, the driving gear 161, and the sealing cover 11 are collinear.

[0040] The top surface of the reaction chamber 10 on the inner wall of the opening 101 is provided with an arc-shaped groove 1010 corresponding to the graphite rod 1421, the assembly rod 1422 and the zinc rod 1423, which is used to limit the graphite rod 1421, the assembly rod 1422 and the zinc rod 1423 (such as Figure 5 The rotating rod 13 is located on the outer wall of the inner cavity of the reaction chamber 10 and a stirring rod 132 is provided inside the graphite rod 1421 , the combination rod 1422 and the zinc rod 1423 .

[0041] A second motor 21 is arranged on the outer side of the upper end surface of the sedimentation tank 20, and the output shaft of the second motor 21 passes through the upper end of the sedimentation tank 20 and is located in the inner cavity of the sedimentation tank 20 to connect with the stirring device 210; an addition port 22 is arranged on the end surface of the sedimentation tank 20 and on one side of the second motor 21; a water outlet pipe 23 and a sludge pipe 24 are arranged on the side surface of one side of the sedimentation tank 20 in sequence from top to bottom.

[0042] Embodiment 2:

[0043] As a further optimization of the scheme of the present application, on the basis of Example 1, an arc-shaped slide plate 1430 is provided on the inner wall of the reaction chamber 10, and a through hole 14300 is provided in the arc-shaped slide plate 1430 corresponding to the sewage inlet pipe 102, and the outer wall of the arc-shaped slide plate 1430 is slidably connected to the inner wall of the reaction chamber 10; the arc-shaped slide plate 1430 is fixedly connected to the bottom surface of the gear ring 14 through an arc-shaped connecting block 143, and the arc-shaped connecting block 143 is located at the outer ring of the graphite rod 1421, the combination rod 1422 and the zinc rod 1423, and an arc-shaped slide groove 105 is provided on the top surface of the reaction chamber 10 corresponding to the arc-shaped connecting block 143; the arc-shaped slide plate 1430 cooperates with the arc-shaped connecting block 143 to realize the closing and opening of the sewage inlet pipe 102 during the rotation of the gear ring 14, thereby realizing the control of the sewage intake amount.

[0044] At the same time, a control valve may also be provided on the sewage inlet pipe 102 to control the conduction of the sewage inlet pipe 102 .

[0045] In addition, a gas outlet is provided on the end surface of the sealing cover 11, and the gas outlet is connected to a gas collecting device for collecting gas generated during the treatment of organic matter in wastewater.

[0046] In addition, the aeration device 104 is connected to an oxygen cylinder via an air duct, so as to replenish oxygen in real time; the air duct is sealed and connected to the side wall of the reaction chamber 10 .

[0047] Embodiment 3:

[0048] A method for treating wastewater by Fenton oxidation during electrolysis, characterized in that: the system described in Example 1 or Example 2 is used, comprising:

[0049] Step 1: First, the wastewater to be treated is passed through the sewage inlet pipe 102, and at the same time, the H2SO4 solution is introduced through the feeding pipe 103; the first motor 12 is driven to drive the stirring rod 132 to rotate through the rotating rod 13 (at this time, as shown in FIG. Figure 1 As shown: the driving gear 161 is located on the upper side of the spline sleeve 131, and the rotation of the rotating rod 13 will not drive the driving gear 161, the driven gear 162 and the gear ring 14 to rotate), thereby mixing the wastewater with the H2SO4 solution to complete the adjustment of the pH value of the wastewater; a pH value detector can be set inside the reaction chamber 10 to maintain the pH value of the wastewater in the reaction chamber 10 between 2 and 4.

[0050] Step 2: Initially, the positioning rods 142 corresponding to the combination rods 1422 and the graphite rods 1421 are respectively inserted into the two conductive seats 113, the two conductive seats 113 are respectively connected to the positive and negative poles of the power supply, and intermittent aeration is performed through the aeration device 104 to complete the Fenton oxidation reaction to degrade organic pollutants;

[0051] The generated hydroxyl radicals combine with organic macromolecules to generate water, carbon dioxide and small molecules, thereby completing the degradation of organic macromolecules.

[0052] Step 3: After a period of degradation (i.e., the iron coating 14222 on the outer ring of the assembly rod 1422 is completely dissolved), the first motor 12 is paused, and the electric telescopic rod 152 is started to extend (the extension of the electric telescopic rod 152 drives the positioning plate 15 and the gear ring 14 to move downward at the same time, and the sliding block 141 of the gear ring 14 slides downward in the vertical slide groove 111. At the same time, the gear ring 14 drives the graphite rod 1421, the assembly rod 1422 and the zinc rod 1423 through the positioning rod 142, and then detaches from the conductive seat 113 and is in a power-off state), so that the spline sleeve 131 is stuck in the spline hole 1611 ( At this time, the sliding block 141 is inserted into the first annular sliding groove 112, and the spring 151 is in an extended state), and at the same time, the graphite rod 1421, the combination rod 1422 and the zinc rod 1423 are separated from the arc groove 1010; the first motor 12 is started again, so that the rotating rod 13 drives the gear ring 14 to rotate (that is, the rotating rod 13 is inserted into the spline hole 1611 through the spline sleeve 131 so that the driving gear 161 rotates with it, and the driving gear 161 drives the gear ring 14 to rotate through the driven gear 162, and the positioning plate 15 does not rotate), and then drives the positioning rod 142 to rotate through the gear ring 14 (that is, as shown in FIG. Figure 6 The zinc rod 1423 is rotated 120° counterclockwise as shown in the figure, so that the zinc rod 1423 corresponds to the combined rod 1422 containing only the mandrel and the conductive seat 113 (that is, the zinc rod 1423 corresponds to the conductive seat 113 of the combined rod 1422 at the beginning, and the combined rod 113 containing only the mandrel corresponds to the conductive seat 113 of the graphite rod 1421 at the beginning; then the first motor 12 is paused again, and the electric telescopic rod 152 is started to shorten (cooperate with the elastic force of the spring 151), so that the zinc rod 1423 and the combined rod 1422 (the positioning rod 142) are clamped into the corresponding conductive seat 113, and the graphite rod 1421, the combined rod 1422 and the zinc rod 1423 are clamped into the arc-shaped clamping groove 1010 again, and the conductive seat 113 is energized to perform an electrochemical reaction;

[0053] Step 4: Start the gear ring 14 to rotate again, so that the graphite rod 1421, the combination rod 1422 and the zinc rod 1423 return to the initial position (i.e., pause the first motor 12, start the electric telescopic rod 152 to extend, so that the spline sleeve 131 is inserted into the spline hole 1611, and the graphite rod 1421, the combination rod 1422 and the zinc rod 1423 are separated from the arc-shaped slot 1010; then start the first motor 12 to rotate the gear ring 14 by 120 degrees clockwise, or by 240 degrees counterclockwise, so that the graphite rod 1421, the combination rod 1422 and the zinc rod 1423 return to the initial position as shown in the figure). Figure 6 Then, the Fenton oxidation reaction is continued to degrade the organic pollutants, and the H2SO4 solution is supplemented in real time to complete the pH value regulation (the pH value of the wastewater in the reaction chamber 10 is maintained between 2 and 4 through a pH value detector);

[0054] Step 5: Repeat steps 2 to 4 until the organic pollutants in the wastewater are completely degraded;

[0055] Step 6: Open the connecting pipe 100, pass the wastewater after organic matter degradation in the reaction chamber 10 into the sedimentation tank 20, add Ba(OH)2 through the addition port 22, and start the second motor 21 for stirring;

[0056] After stirring for a period of time, the mixture is allowed to settle and solid-liquid separation is performed through the outlet pipe 23 and the sludge pipe 24 in turn; an arc-shaped filter screen can be provided at the outlet pipe 23 to prevent suspended impurities from being discharged through the outlet pipe 23.

[0057] Embodiment 4:

[0058] As a further optimization of the scheme of the present application, on the basis of Example 3, when carrying out the reactions of steps 2 to 5, an insulating shell and a temperature sensor can be arranged on the outer wall of the reaction chamber 1 so that the temperature can be kept constant at 30 to 50°C during the reaction process, thereby ensuring efficient and sufficient reaction.

[0059] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved. In addition, it should be understood that although this specification is described in accordance with the implementation methods, not each implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A system for treating wastewater by Fenton oxidation during electrolysis, characterized in that: The invention comprises a reaction chamber and a sedimentation tank, wherein an opening is arranged on the upper end face of the reaction chamber, and a sealing cover with an "n"-shaped cross section is arranged on the outer ring of the opening; a first motor is arranged on the end face of the sealing cover, and an output shaft of the first motor is fixedly connected to a rotating rod, and the rotating rod penetrates the sealing cover and is rotatably connected to the bottom face of the inner cavity of the reaction chamber; a gear ring with internal teeth is slidably connected to the inner wall of the sealing cover, and a positioning plate is arranged on the upper end of the inner wall of the gear ring, the outer wall of the positioning plate is rotatably connected to the inner wall of the gear ring, and the upper end of the positioning plate and the sealing cover are connected to an electric telescopic rod through a spring; a gear assembly for driving the gear ring to rotate is arranged on the lower side of the positioning plate, and the rotating rod penetrates the positioning plate and the gear assembly in sequence; three positioning rods are arranged on the gear ring and around its axis in a planetary gear-like manner, the three positioning rods penetrate the gear ring respectively, and graphite rods, combination rods and zinc rods are arranged on their bottom ends respectively, the core shaft of the combination rod is a graphite layer, and the outer ring is an iron plating layer, and an aeration device is arranged on the bottom face of the inner cavity of the reaction chamber corresponding to the graphite rod; conductive seats are arranged on the inner top end of the sealing cover corresponding to two of the positioning rods, and the positioning rods can be clamped in the corresponding conductive seats.

2. The system for treating wastewater by Fenton oxidation during electrolysis according to claim 1, characterized in that: A sewage inlet pipe is arranged on one side of the reaction chamber, and a feed pipe is arranged on the other side.

3. A system for treating wastewater by Fenton oxidation during electrolysis according to claim 1 or 2, characterized in that: An arc-shaped slide plate is arranged on the inner wall of the reaction chamber, and a through hole is provided on the arc-shaped slide plate corresponding to the sewage inlet pipe, and the outer wall of the arc-shaped slide plate is slidably connected to the inner wall of the reaction chamber; the arc-shaped slide plate is fixedly connected to the bottom surface of the gear ring through an arc-shaped connecting block, the arc-shaped connecting block is located on the outer ring of the graphite rod, the combination rod and the zinc rod, and an arc-shaped slide groove is provided on the top surface of the reaction chamber corresponding to the arc-shaped connecting block.

4. A system for treating wastewater by Fenton oxidation during electrolysis according to any one of claims 1 to 3, characterized in that: The outer ring of the gear ring is evenly provided with a plurality of sliding blocks around its axis, a vertical sliding groove is provided on the inner wall of the sealing cover corresponding to the sliding block and a first annular sliding groove is provided at the bottom of the vertical sliding groove, the plurality of vertical sliding grooves are connected with the same annular sliding groove, the sliding block is inserted into the corresponding vertical sliding groove and is slidably connected, and the sliding block can slide in the annular sliding groove.

5. A system for treating wastewater by Fenton oxidation during electrolysis according to any one of claims 1 to 3, characterized in that: The outer ring of the positioning plate is evenly arranged with multiple rotating blocks around its axis, and the end of the rotating block away from the positioning plate is arranged as a spherical structure. The inner ring of the gear ring is provided with a second annular groove at the upper end of the inner teeth, and the end of the rotating block away from the positioning plate is stuck in the second annular groove and slidably connected.

6. The system for treating wastewater by Fenton oxidation during electrolysis according to claim 2, characterized in that: The electric telescopic rod is evenly distributed around the central axis of the positioning plate, and the spring is evenly distributed around the central axis of the positioning plate. The spring has two circles, which are respectively located at the inner circle and the outer circle of the electric telescopic rod.

7. The system for treating wastewater by Fenton oxidation during electrolysis according to claim 2, characterized in that: The gear assembly includes a driving gear and three driven gears. The driving gear is sleeved on the outer wall of the rotating rod and is suspended on the bottom surface of the positioning plate through a hanging rod. A spline hole is opened in the middle of the driving gear; the outer ring of the driving gear and three driven gears are evenly distributed around its axis. The driven gear is rotatably connected to the bottom surface of the positioning plate through a rotating shaft and the driven gears are respectively meshed with the driving gear and the inner teeth of the gear ring; the rotating rod is located on the outer ring of the lower side of the driving gear and a spline sleeve is set corresponding to the spline hole.

8. The system for treating wastewater by Fenton oxidation during electrolysis according to claim 7, characterized in that: The central axes of the rotating rod, the gear ring, the positioning plate, the driving gear and the sealing cover are collinear.

9. A system for treating wastewater by Fenton oxidation during electrolysis according to claim 8, characterized in that: The reaction chamber is connected with the sedimentation tank through a connecting pipe, and a control valve is arranged on the connecting pipe; a second motor is arranged on the outer side of the upper end surface of the sedimentation tank, and the output shaft of the second motor passes through the upper end of the sedimentation tank and is located in the inner cavity of the sedimentation tank to connect with the stirring device; an addition port is arranged on the end surface of the sedimentation tank and on one side of the second motor; a water outlet pipe and a sludge pipe are arranged on the side surface of one side of the sedimentation tank in sequence from top to bottom.

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