Multi-stage electrochemical treatment device for fine chemical wastewater and treatment method of multi-stage electrochemical treatment device

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a multistage electrochemical treatment device for fine chemical wastewater and a treatment method of the multistage electrochemical treatment device. The device comprises a complex breaking unit, a deep oxidation unit and a flocculation unit which are arranged in sequence, wherein the complex breaking unit comprises a circular groove, and the circular groove is provided with a rotational flow liquid inlet pipe, an anode structure, a cathode structure and a floating foam separation mechanism; a self-cleaning deep oxidation mechanism is arranged in a tank body of the deep oxidation unit; a tank body of the flocculation unit is divided into a flocculation area and an accumulation area by a partition plate, and the two areas are respectively provided with a polar plate electrolysis structure. According to the treatment method, step-by-step advanced treatment of the fine chemical wastewater is realized through complex breaking and primary oxidation, deep electrochemical oxidation, electric flocculation and solid-liquid separation in cooperation with regular maintenance and parameter adjustment of the device. The device solves the problems of functional interference, easy passivation of electrodes and the like of a traditional device, and is high in treatment efficiency and suitable for fine chemical wastewater treatment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of manufacturing special equipment for environmental protection, in particular to the field of wastewater treatment, and is a multi-stage electrochemical treatment device for fine chemical wastewater and a treatment method thereof, which is suitable for water pollution prevention and control. BACKGROUND

[0002] Under the background of continuous upgrading of chemical industry structure, fine chemical products are developing towards high value-added and multi-functionalization, and the composition of wastewater generated in the production process is becoming more and more complex. Such wastewater not only contains benzene series, phenols, heterocyclic compounds and other persistent organic pollutants that are difficult to biodegrade, but also often contains stable complexes formed by heavy metal ions (such as chromium, nickel, copper, etc.) and organic ligands, which become the focus and difficulty in the field of industrial wastewater treatment.

[0003] In the prior art, electrochemical advanced oxidation technology has unique potential in the treatment of fine chemical wastewater due to its mild reaction conditions, strong oxidation ability (OH and other strong oxidizing free radicals) and no secondary pollution. However, the existing electrochemical treatment technology and device still has the following deficiencies in actual application: In the treatment process of traditional flat plate electrodes or fixed bed electrodes, the electrode surface is easily covered by metal hydroxide, organic polymer and inorganic salt scale generated by electrolysis, forming a dense passivation layer. And the existing device synchronously completes the functions of complex breaking, oxidation, flocculation and other multiple functions in a single reaction cavity. However, the strong electric field environment required for complex breaking will damage the stability of the flocculation floc, and the floc generated in the flocculation process will cover the electrode surface, inhibiting the oxidation reaction. SUMMARY

[0004] The purpose of the present application is to provide a multi-stage electrochemical treatment device for fine chemical wastewater to solve the problems raised in the background art.

[0005] The purpose of the present application can be achieved by the following technical solutions: A multi-stage electrochemical treatment device for fine chemical wastewater, comprising: A complex breaking unit, comprising a circular groove, a plurality of overflow grooves are arranged in a circumferential array at the top end of the circular groove, a cyclone liquid inlet pipe is arranged at the lower part of the circular groove, a coaxial anode structure is fixedly installed in the circular groove, and a cathode structure is arranged on the inner wall of the circular groove in cooperation; and a scum separation mechanism arranged at the upper part of the circular groove; A deep oxidation unit for receiving and treating wastewater treated by the complex breaking unit, comprising a groove one, a discharge port three and a feed port one are arranged at both ends of the groove one respectively, and a self-cleaning deep oxidation mechanism is installed in the groove one; The flocculation unit is used for receiving and processing the wastewater treated by the deep oxidation unit, and comprises a tank body two, a flocculation zone and an aggregation zone are arranged in the tank body two.

[0006] Further, the anode structure comprises an insulating column fixedly installed on the bottom surface of the circular groove, the insulating column is coaxial with the circular groove, a plurality of vertical installation grooves are formed on the periphery of the insulating column, and the plurality of installation grooves are distributed in a circumferential array about the axis of the insulating column. A plurality of first anode plates are installed on the periphery of the insulating column through the plurality of installation grooves.

[0007] Further, the cathode structure comprises a plurality of arc-shaped cathode plates attached to the inner wall of the circular groove, and the plurality of arc-shaped cathode plates form a cylindrical cathode structure on the inner wall of the circular groove, which cooperates with the plurality of first anode plates.

[0008] Further, the floating-foam separation mechanism comprises: a transition groove fixedly installed at an upper position on the periphery of the circular groove, the top end of the transition groove is higher than the top end of the circular groove, the bottom surface of the transition groove is provided with a discharge port one, and the bottom end of the discharge port one is fixedly connected with a liquid outlet pipe; a foam collecting groove fixedly installed on the periphery of the transition groove, the top end of the foam collecting groove is higher than the top end of the transition groove, the bottom surface of the foam collecting groove is provided with a discharge port two, the bottom end of the discharge port two is fixedly connected with a foam outlet pipe, and the bottom end of the foam outlet pipe guides the floating foam to a designated position through a guide pipe; and a separation assembly rotatably installed at a central position on the top surface of the insulating column.

[0009] Further, the separation assembly comprises a rotating shaft, the bottom end of the rotating shaft is rotatably installed at a central position on the top surface of the insulating column; a plurality of circumferentially arrayed connecting rods are fixedly connected to the middle position on the periphery of the rotating shaft, the one end of the connecting rod away from the rotating shaft is fixedly connected with a vertical hanging rod, and the bottom end of the hanging rod is fixedly installed with a driving plate between the first anode plate and the arc-shaped cathode plate; the top end of the rotating shaft is fixedly installed with a mounting disc, a plurality of circumferentially arrayed L-shaped rods are fixedly connected to the periphery of the mounting disc, the one end of the L-shaped rod away from the rotating shaft is fixedly connected with a foam collecting plate arranged in the transition groove, the foam collecting plate is obliquely arranged, and the two ends of the foam collecting plate are in sliding contact with the inner wall of the transition groove and the periphery of the circular groove, respectively.

[0010] Further, the self-cleaning deep oxidation mechanism comprises a self-cleaning mechanism, the self-cleaning mechanism comprises a mounting plate, the top surface of the tank body one is provided with a mounting plate at an intermediate position between the two ends, and the bottom surface of the mounting plate is fixedly connected with a support plate between the bottom surface of the tank body one and the two end positions. The top surface center position of the mounting plate is fixedly installed with an electric push rod, the telescopic end of the electric push rod is slidably penetrated through the mounting plate and is fixedly connected with a rectangular groove, two mounting assemblies are arranged between the two rectangular grooves, and the bottom surface of the mounting assembly is fixedly installed with an oxidation assembly.

[0011] Further, the mounting assembly comprises a mounting strip plate arranged between the two rectangular grooves, the top surface center position of the mounting strip plate is fixedly installed with a vibration motor with a vertical axis, both end positions of the top surface of the mounting strip plate are fixedly installed with connecting blocks, the outer side surface of the connecting block is fixedly connected with a sliding block matched with the rectangular groove at a position close to the top end, one end of the sliding block away from the connecting block is slidably extended into the rectangular groove at the corresponding position, and one end of the sliding block in the rectangular groove is fixedly connected with a spring between the inner end surface of the rectangular groove. The peripheral side of the sliding block is embedded with a plurality of uniformly distributed rolling balls, and the sliding block is in rolling contact with the mounting strip plate through the rolling balls.

[0012] Further, the oxidation assembly comprises a plurality of U-shaped mounting pieces fixedly installed on the bottom surface of the mounting strip plate, and the plurality of U-shaped mounting pieces are arrayed along the length direction of the mounting strip plate. The U-shaped mounting piece is detachably fixedly installed with a second anode plate or a cathode plate through bolts. The plurality of second anode plates and the cathode plates are alternately distributed, one end of the second anode plate is attached to the inner side of the groove body one, the other end of the second anode plate is spaced apart from the inner side of the groove body one, one end of the adjacent cathode plate opposite to the second anode plate is attached to the inner side of the groove body one, the other end of the adjacent cathode plate is spaced apart from the inner side of the groove body one, so that the plurality of cathode plates and the second anode plates form an S-shaped flow channel in the groove body one. The side surface of the cathode plate and the second anode plate is provided with a disturbance block.

[0013] Further, one end of the groove body two is provided with a second feeding port, and the other end is provided with a slot; a partition plate is arranged at the middle position of the groove body two, the partition plate divides the groove body two into the flocculation zone and the aggregation zone, the flocculation zone is located between the partition plate and the second feeding port, the flocculation zone is installed with an electrode plate electrolysis structure one, and the aggregation zone is installed with an electrode plate electrolysis structure two. The bottom surface of the flocculation zone and the aggregation zone is a slope, and the end close to the slot is a lower section, and the lower end of the bottom surface of the flocculation zone and the aggregation zone is provided with a discharge port. The bottom surface of the groove body two is fixedly installed with a supporting leg at a position close to the corner.

[0014] Another object of the present application is to provide a treatment method for fine chemical wastewater, comprising the following steps: S1: breaking the complex and primary oxidation treatment; The fine chemical wastewater to be treated is introduced into the round tank of the complex breaking unit, and the wastewater is formed into a cyclone in the round tank through a cyclone inlet pipe; a voltage is applied to the anode structure and the cathode structure in the round tank to form an electrolysis electric field, and under the synergistic action of the cyclone and the electric field, the complex breaking and the preliminary degradation of macromolecular organic matters in the wastewater are realized; the floating scum generated in the process is separated and collected through a floating scum separation mechanism, and the clear liquid after treatment is transported to the deep oxidation unit; S2: deep electrochemical oxidation treatment The wastewater after complex breaking enters the tank body one of the deep oxidation unit and flows along the flow channel formed by the electrodes in the self-cleaning deep oxidation mechanism; a voltage is applied to the electrodes to make strong oxidizing substances generated on the electrode surface, and under the action of the flow field in the flow channel, the small molecular organic matters and the strong oxidizing substances fully react to realize deep degradation; the self-cleaning program is started regularly to clean and maintain the electrodes, and the wastewater after treatment is transported to the flocculation unit; S3: electroflocculation and solid-liquid separation treatment The wastewater after deep oxidation enters the flocculation zone of the flocculation unit, a voltage is applied to the electrode structure one to promote the anode dissolution of metal ions and the formation of flocculation bodies, and the preliminary flocculation is completed; the wastewater then enters the aggregation zone, a low voltage is applied to the electrode structure two to make the small flocculation bodies grow up; the grown flocculation bodies are settled along the inclined surface and discharged through the discharge port, and the supernatant is overflowed through the tank opening to become the treated water meeting the standard; S4: regular maintenance of the device and parameter adjustment Regularly check the electrode state, pipeline smoothness and valve flexibility of each unit; according to the change of the water quality, adjust the voltage, current density and water inflow of each unit; when the electrode appears passivation or loss, replace the corresponding electrode in time to ensure the stable and efficient operation of the device.

[0015] Advantages of the present application: 1. The electrode passivation period is significantly prolonged by the cyclone scouring of the complex breaking unit, and the problems of easy passivation of the electrode and high maintenance cost are effectively solved.

[0016] 2. The present application adopts the independent and synergistic design of three-stage units of complex breaking, oxidation and flocculation; the radial electric field and the cyclone field of the complex breaking unit optimize the complex breaking effect, the S-shaped flow channel of the deep oxidation unit strengthens the degradation of organic matters, and the partition design of the flocculation unit improves the solid-liquid separation efficiency. This mode eliminates the problem of mutual inhibition of reaction in the traditional device, thereby improving the treatment effect of fine chemical wastewater.

[0017] 3. The present application utilizes the wastewater cyclone kinetic energy to drive the floating scum separation mechanism, realizes the continuous separation of floating scum without power, effectively prevents the foam carrying pollutants from entering the subsequent unit, and avoids the problems of pipeline blockage, equipment corrosion and pollutant transfer.

[0018] 4. The synergistic action of the S-shaped flow channel and the disturbance block improves the mass transfer efficiency and current efficiency, and reduces the energy consumption per unit COD removal. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort. Figure 1 is a three-dimensional schematic view of the overall structure of the present application; Figure 2 is a three-dimensional schematic view of the breaking unit in the present application; Figure 3 is a three-dimensional schematic view of the internal structure of the circular groove in the present application; Figure 4 is a three-dimensional schematic view of the internal structure of the circular groove in the present application; Figure 3 is an enlarged view of part A in Figure 5 is a three-dimensional schematic view of the internal structure of the circular groove in the present application; Figure 2 is a three-dimensional schematic view of the internal structure of the circular groove in the present application; Figure 6 is an enlarged view of part B in Figure 5 is a three-dimensional schematic view of the internal structure of the circular groove in the present application; Figure 7 Figure 5 is an enlarged view of part C in Figure 8 is a three-dimensional schematic view of the internal structure of the circular groove in the present application; Figure 5 is an enlarged view of part D in Figure 9 is a three-dimensional schematic view of the deep oxidation unit in the present application; Figure 10 Figure 9 is an enlarged view of part E in Figure 11 is a structural schematic view of the connection relationship between the slider and the rectangular groove in the present application; Figure 12 is a structural schematic view of the flocculation unit in the present application; The reference signs in the drawings are as follows: ​​1 - break unit, 2 - deep oxidation unit, 3 - flocculation unit, 4 - round tank, 5 - froth separation mechanism, 6 - liquid outlet pipe, 7 - froth outlet pipe, 8 - separation assembly, 9 - cyclone inlet pipe, 10 - overflow tank, 11 - arc-shaped cathode plate, 12 - insulating column, 13 - mounting groove, 14 - first anode plate, 15 - transition tank, 16 - froth collecting tank, 17 - discharge port one, 18 - discharge port two, 19 - rotating shaft, 20 - connecting rod, 21 - mounting disc, 22 - L-shaped rod, 23 - froth collecting plate, 24 - hanger rod, 25 - driving plate, 26 - tank body one, 27 - support plate, 28 - mounting plate, 29 - electric push rod, 30 - mounting strip plate, 31 - vibration motor, 32 - second anode plate, 33 - cathode plate, 34 - U-shaped mounting piece, 35 - discharge port three, 36 - inlet port one, 37 - connecting block, 38 - sliding block, 39 - rectangular groove, 40 - ball, 41 - tank body two, 42 - inlet port two, 43 - support leg, 44 - flocculation zone, 45 - partition plate, 46 - aggregation zone, 47 - slot, 48 - inclined surface, 49 - discharge port, 50 - electrode plate electrolysis structure one, 51 - electrode plate electrolysis structure two, 52 - spring. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0021] Embodiment 1: please refer to Figures 1-3 , Figure 9 , Figure 10 and Figure 12 In the embodiments of the present application, a multi-stage electrochemical treatment device for fine chemical wastewater comprises: The break unit 1 comprises a round tank 4, a plurality of overflow tanks 10 are arranged in a circumferential array at the top end of the round tank 4, a cyclone inlet pipe 9 is arranged at the lower position of the round tank 4, coaxial anode structures are fixedly installed in the round tank 4, and cathode structures are arranged on the inner wall of the round tank 4 for cooperation; and the device further comprises a froth separation mechanism 5 arranged at the upper position of the round tank 4. The deep oxidation unit 2 is used for receiving and processing wastewater treated by the break unit 1, and comprises a tank body one 26, a discharge port three 35 and an inlet port one 36 are arranged at the two ends of the tank body one 26, respectively, and a self-cleaning deep oxidation mechanism is installed in the tank body one 26. The flocculation unit 3 is used for receiving and processing wastewater treated by the deep oxidation unit 2, and comprises a tank body two 41, a flocculation zone 44 and an aggregation zone 46 are arranged in the tank body two 41.

[0022] The fine chemical wastewater is firstly pressurized by a delivery pump, and is pumped into the circular groove 4 of the complex breaking unit 1 through the cyclone inlet pipe 9 at a tangential angle, generally with an angle of 15°-30° with the tangent of the inner wall of the circular groove 4, to form a high-speed cyclone in the groove. At the same time, a direct current voltage is applied to the anode structure and the cathode structure in the circular groove 4 to form a radial electrolysis electric field. The complex in the wastewater is broken and the macromolecular organic matter is preliminarily degraded under the synergistic action of the cyclone shear force and the electric field, so that the complex breaking and the primary oxidation are realized. The floating scum generated in the process is separated and collected by the floating scum separation mechanism 5 as the cyclone rises to the liquid surface. The wastewater treated by the complex breaking is transported to the deep oxidation unit 2 through the overflow groove 10 and the transition groove 15 and then through the liquid outlet pipe 6.

[0023] In the deep oxidation unit 2, the wastewater enters the groove body 26 from the feeding port 1 36, and a direct current voltage is applied in the electric field formed by the second anode plate 32 and the cathode plate 33 of the self-cleaning deep oxidation mechanism to generate OH, O3 and other strong oxidizing substances, so that the small molecular organic matter in the wastewater is further degraded and even mineralized into CO2 and H2O. The treated wastewater is discharged from the discharging port 3 35 and enters the feeding port 2 42 of the flocculation unit 3.

[0024] In the flocculation unit 3, the wastewater first enters the flocculation zone 44, and the electrode electrolysis structure 1 50 applies a direct current voltage of 5-15V, so that the soluble anode such as the iron anode dissolves Fe²⁺, the Fe²⁺ is converted into Fe³⁺ under the action of the electric field and oxygen to form the iron hydroxide flocculation body, which adsorbs the suspended matter and the residual pollutants in the wastewater to complete the preliminary flocculation. Then the wastewater crosses the partition plate 45 to enter the aggregation zone 46, and the electrode electrolysis structure 2 51 applies a low-voltage electric field of 3-8V to create a stable flow environment and promote the fine flocculation body to further collide and aggregate to form a large-particle-size flocculation body. The flocculation body is settled along the inclined surface 48 under the action of gravity and is discharged through the discharging port 49, and the supernatant is overflowed from the groove port 47 to complete the whole treatment process.

[0025] The present application disassembles the complex treatment process into directional functional modules by independently designing the three-stage units of complex breaking, deep oxidation and flocculation. The strong cyclone of the complex breaking unit 1 and the electric field are matched with the complex breaking requirement, and the partition design of the flocculation unit 3 optimizes the flocculation effect to avoid the reaction inhibition problem in the traditional device, so that the wastewater treatment effect is significantly improved.

[0026] And the operation parameters of each unit can be independently adjusted according to the wastewater quality, and the present application is suitable for different types of fine chemical wastewater treatment such as dyes, medicines and pesticides, and has high flexibility.

[0027] Example 2: Please refer to Figure 3 and Figure 4On the basis of embodiment 1, the anode structure includes an insulating column 12 fixedly installed on the bottom surface of the circular groove 4, the insulating column 12 is coaxial with the circular groove 4, a plurality of vertical installation grooves 13 are arranged on the periphery of the insulating column 12, and the plurality of installation grooves 13 are distributed in a circumferential direction about the axis of the insulating column 12. A plurality of first anode plates 14 are installed on the periphery of the insulating column 12 through the plurality of installation grooves 13.

[0028] The cathode structure includes a plurality of arc-shaped cathode plates 11 attached to the inner wall of the circular groove 4, and the plurality of arc-shaped cathode plates 11 form a cylindrical cathode structure on the inner wall of the circular groove 4, which cooperates with the plurality of first anode plates 14.

[0029] The anode structure of the breakage unit 1 takes the insulating column 12 as a central axis, the insulating column 12 is coaxially arranged with the circular groove 4, a plurality of vertical installation grooves 13 are arranged on the periphery of the insulating column 12, and the plurality of installation grooves 13 are used to fix the first anode plates 14, thereby forming a radial divergent anode layout. The cathode structure is composed of a plurality of arc-shaped cathode plates 11, which are attached to the inner wall of the circular groove 4 and form a central-peripheral electrolytic electric field with the first anode plates 14.

[0030] When the wastewater enters the circular groove 4 through the cyclone inlet pipe 9, the high-speed cyclone drives the wastewater to make a circular motion between the first anode plates 14 and the arc-shaped cathode plates 11, the pollutants fully contact the electrode surface in the radial electric field, and redox reaction occurs to achieve breakage.

[0031] In this embodiment, the radially arranged first anode plates 14 and the cylindrical arc-shaped cathode plates 11 form a non-uniform electric field, the electric field strength is distributed in a gradient from the center to the periphery, which is suitable for the flow velocity distribution of the cyclone field, so that the pollutants can be efficiently reacted in different regions, and the mass transfer efficiency and the complex compound breaking rate are improved.

[0032] At the same time, the high-speed cyclone wastewater continuously scours the surface of the first anode plates 14 and the arc-shaped cathode plates 11, reduces the attachment of pollutants, can effectively prolong the passivation period of the electrode, and reduces the maintenance cost.

[0033] Embodiment 3: please refer to Figure 2 and Figures 5-8 On the basis of embodiment 2, the floating scum separation mechanism 5 includes: A transition groove 15 is fixedly installed at an upper position on the periphery of the circular groove 4, the top end of the transition groove 15 is higher than the top end of the circular groove 4, the bottom surface of the transition groove 15 is provided with a discharge port one 17, and the bottom end of the discharge port one 17 is fixedly connected with the liquid outlet pipe 6; A scum collecting groove 16 is fixedly installed on the periphery of the transition groove 15, the top end of the scum collecting groove 16 is higher than the top end of the transition groove 15, the bottom surface of the scum collecting groove 16 is provided with a discharge port two 18, the bottom end of the discharge port two 18 is fixedly connected with the scum outlet pipe 7, and the bottom end of the scum outlet pipe 7 guides the floating scum to a designated position through a conduit; and a separation assembly 8 rotatably installed at the center of the top surface of the insulating column 12.

[0034] The separation assembly 8 comprises a rotating shaft 19, the bottom end of which is rotatably installed at the center of the top surface of the insulating column 12; A plurality of connecting rods 20 are fixedly connected to the outer periphery of the rotating shaft 19, and the ends of the connecting rods 20 away from the rotating shaft 19 are fixedly connected with vertical hangers 24, the bottom ends of which are fixedly installed with driving plates 25 between the first anode plate 14 and the arc-shaped cathode plate 11; The top end of the rotating shaft 19 is fixedly installed with a mounting disc 21, the outer periphery of which is fixedly connected with a plurality of L-shaped rods 22 arranged in a circumferential array, the ends of the L-shaped rods 22 away from the rotating shaft 19 are fixedly connected with collecting plates 23 arranged in the transition groove 15, the collecting plates 23 are obliquely arranged, and the two ends of the collecting plates 23 are in sliding contact with the inner wall of the transition groove 15 and the outer periphery of the circular groove 4, respectively.

[0035] In this embodiment, the transition groove 15 of the floating scum separation mechanism 5 surrounds the upper part of the circular groove 4, and the top end thereof is higher than the top end of the circular groove 4, for receiving the waste water and floating scum discharged from the overflow groove 10 of the circular groove 4, and realizing preliminary stable flow; the collecting groove 16 surrounds the outer periphery of the transition groove 15, and the top end thereof is higher than the top end of the transition groove 15, for collecting floating scum. The rotating shaft 19 of the separation assembly 8 is vertically installed at the center of the top surface of the insulating column 12, and the connecting rods 20, the hangers 24 and the driving plates 25 on the outer periphery thereof constitute a power transmission structure, that is, the high-speed rotational flow in the circular groove 4 drives the driving plates 25 to rotate, and drives the rotating shaft 19 to rotate.

[0036] The mounting disc 21, the L-shaped rods 22 and the collecting plates 23 at the top end of the rotating shaft 19 constitute a floating scum collection structure: the collecting plates 23 are obliquely arranged, and the two ends thereof are in sliding contact with the inner wall of the transition groove 15 and the outer periphery of the circular groove 4, respectively, and when the rotating shaft 19 rotates, the floating scum on the liquid surface of the transition groove 15 is scraped and collected and guided to the collecting groove 16. The clear liquid in the transition groove 15 is transported to the deep oxidation unit 2 through the discharge port one 17 and the liquid outlet pipe 6, and the floating scum in the collecting groove 16 is collected to a designated container through the discharge port two 18 and the scum outlet pipe 7.

[0037] In this embodiment, the separation assembly 8 is driven by the rotational flow kinetic energy of the waste water, without the need for additional motors or pneumatic devices; the continuous scraping and collecting effect of the oblique collecting plates 23 improves the floating scum separation effect, effectively prevents the floating scum from carrying pollutants into the subsequent units, and reduces the risk of pipeline blockage and equipment corrosion.

[0038] Embodiment 4: Please refer to Figures 9-11 On the basis of Embodiment 1, the self-cleaning deep oxidation mechanism comprises a self-cleaning mechanism, the self-cleaning mechanism comprises mounting plates 28, the top surfaces of the two ends of the groove body one 26 are provided with the mounting plates 28 above the middle positions, and the bottom surfaces of the two ends of the mounting plates 28 are fixedly connected with support plates 27 between the bottom surfaces of the groove body one 26. The electric push rod 29 is fixedly installed at the center of the top surface of the mounting plate 28, and the telescopic end of the electric push rod 29 is slidingly connected with a rectangular groove 39. An installation assembly is arranged between the two rectangular grooves 39, and an oxidation assembly is fixedly installed at the bottom surface of the installation assembly.

[0039] The installation assembly comprises an installation strip plate 30 arranged between the two rectangular grooves 39. The vibration motor 31 is fixedly installed at the center of the top surface of the installation strip plate 30 in a vertical manner. The connection blocks 37 are fixedly installed at both ends of the top surface of the installation strip plate 30. The sliding blocks 38 are fixedly connected with the outer side of the connection blocks 37 near the top end and are adapted to the rectangular grooves 39. The sliding blocks 38 are slidingly extended into the corresponding rectangular grooves 39 away from the connection blocks 37. The spring 52 is fixedly connected between the end of the sliding block 38 located in the rectangular groove 39 and the inner end surface of the rectangular groove 39. The plurality of uniformly distributed rolling balls 40 are embedded in the circumferential side of the sliding block 38. The rolling balls 40 are in rolling contact between the sliding block 38 and the installation strip plate 30.

[0040] In the self-cleaning mechanism of the self-cleaning deep oxidation mechanism, the rectangular grooves 39 and the installation assembly and the oxidation assembly below can be lifted as a whole by the telescopic movement of the electric push rod 29, so as to realize the lifting of the oxidation assembly for maintenance or placement for work.

[0041] The installation strip plate 30 of the installation assembly is slidingly connected with the rectangular grooves 39 through the connection blocks 37 and the sliding blocks 38. The spring 52 between the sliding block 38 and the rectangular groove 39 provides elastic support, and the rolling balls 40 on the circumferential side of the sliding block 38 reduce the sliding friction. The vibration motor 31 is installed at the center of the top surface of the installation strip plate 30 and generates high-frequency vibration after being started. The vibration is transmitted to the second anode plate 32 and the cathode plate 33 of the oxidation assembly through the installation strip plate 30, so that the dirt such as inorganic salt dirt and organic residue attached to the surface of the electrode is detached under the action of vibration.

[0042] In the embodiment, the high-frequency vibration can make the dirt on the surface of the electrode fall off without manual pickling or polishing, effectively shortening the single cleaning time. Moreover, the vibration cleaning avoids the damage of mechanical polishing to the coating on the surface of the electrode, prolonging the service life of the electrode plate.

[0043] The rolling friction design of the rolling balls 40 reduces the sliding resistance of the sliding block 38 in the rectangular groove 39, and the elastic support of the spring 52 ensures that the vibration of the vibration motor 31 is efficiently transmitted to all electrodes.

[0044] Embodiment 5: Please refer to Figure 9 On the basis of the embodiment 6, the oxidation assembly comprises a plurality of U-shaped mounting pieces 34 fixedly installed at the bottom surface of the installation strip plate 30, and the plurality of U-shaped mounting pieces 34 are arrayed along the length direction of the installation strip plate 30. The U-shaped mounting member 34 is detachably fixedly mounted with the second anode plate 32 or the cathode plate 33 through bolts; The plurality of second anode plates 32 and cathode plates 33 are alternately distributed, one end of the second anode plate 32 is attached to the inner side of the groove body 26, and the other end is spaced from the inner side of the groove body 26, the adjacent cathode plate 33 is attached to the inner side of the groove body 26 at the end opposite to the second anode plate 32, and the other end is spaced from the inner side of the groove body 26, so that the plurality of cathode plates 33 and second anode plates 32 form an S-shaped flow channel in the groove body 26; The side surfaces of the cathode plate 33 and the second anode plate 32 are provided with disturbance blocks.

[0045] In the embodiment, the plurality of U-shaped mounting members 34 of the oxidation assembly are uniformly distributed along the length direction of the mounting strip plate 30, the spacing therebetween can be pre-set, the second anode plate 32 or the cathode plate 33 is detachably mounted through bolts, and the two are alternately arranged. One end of the second anode plate 32 is closely attached to the inner side of the groove body 26, and the other end is reserved with a spacing; the adjacent cathode plate 33 adopts the opposite mounting mode, that is, the attached end and the spaced end are exchanged, so that the second anode plate 32 and the cathode plate 33 form a continuous S-shaped flow channel in the groove body 26.

[0046] At the same time, the side surfaces of the second anode plate 32 and the cathode plate 33 are provided with protruding disturbance blocks. When the wastewater enters the S-shaped flow channel from the feed port 36, it needs to flow along the flow channel in a zigzag manner, generating turbulent flow at the turning points, and the disturbance blocks further intensify the disturbance of the water flow, so that the wastewater is fully contacted with the electrode surface, and a deep oxidation reaction occurs under the action of the electric field.

[0047] Therefore, in the embodiment, the S-shaped flow channel prolongs the residence time of the wastewater in the groove body 26, ensuring that the small-molecule organic matter has sufficient time to be degraded by the oxidant such as OH, and the COD removal rate and the degree of mineralization are significantly improved.

[0048] At the same time, the turning of the S-shaped flow channel and the disturbance blocks synergistically improve the turbulent flow intensity of the water flow, increase the contact probability of the pollutants and the active sites on the electrode surface, improve the current efficiency, and reduce the energy consumption.

[0049] The bolt connection design of the U-shaped mounting member 34 enables the second anode plate 32 and the cathode plate 33 to be flexibly replaced according to the water quality of the wastewater.

[0050] Example 6: Please refer to Figure 1 and Figure 12On the basis of embodiment 1, one end of the groove body two 41 is provided with a feeding port two 42, and the other end is provided with a notch 47; a partition plate 45 is arranged at the middle position of the groove body two 41, the partition plate 45 separates the groove body two 41 into a flocculation zone 44 and an aggregation zone 46, the flocculation zone 44 is located between the partition plate 45 and the feeding port two 42, and the flocculation zone 44 is provided with an electrode plate electrolysis structure one 50, and the aggregation zone 46 is provided with an electrode plate electrolysis structure two 51; The bottom surfaces of the flocculation zone 44 and the aggregation zone 46 are inclined surfaces 48, and the end close to the notch 47 is a lower section, and the lower end of the bottom surface of the flocculation zone 44 and the aggregation zone 46 is provided with a discharge port 49; The bottom surface of the groove body two 41 is fixedly installed with a supporting leg 43 at the position close to the corner.

[0051] In this embodiment, the groove body two 41 of the flocculation unit 3 is separated into the flocculation zone 44 and the aggregation zone 46 by the partition plate 45, the flocculation zone 44 is internally provided with the electrode plate electrolysis structure one 50, and a soluble iron anode or an aluminum anode is used; the aggregation zone 46 is close to the notch 47, and is internally provided with the electrode plate electrolysis structure two 51, and an inert electrode such as a titanium electrode is used.

[0052] In work, after the wastewater enters the flocculation zone 44 from the feeding port two 42, the electrode plate electrolysis structure one 50 applies a direct current voltage of 5-15V, and the anode dissolves metal ions such as Fe³⁺ to quickly form fine flocculation bodies; then the wastewater crosses the partition plate 45 to enter the aggregation zone 46, and the electrode plate electrolysis structure two 51 applies a low-voltage electric field of 3-8V to form a steady flow environment, and the fine flocculation bodies are electrophoresed and collided under the action of the electric field to gradually aggregate to form large-particle-size flocs.

[0053] The bottom surfaces of the flocculation zone 44 and the aggregation zone 46 are designed as inclined surfaces 48, and the end close to the notch 47 is a lower end, and the settled flocs slide along the inclined surface 48 to the discharge port 49 and are regularly discharged; the supernatant overflows from the notch 47.

[0054] In this embodiment, the strong electric field of the flocculation zone 44 promotes the rapid generation and preliminary flocculation of the flocculant, and the steady flow environment of the aggregation zone 46 promotes the growth of the flocs, and the two steps synergistically make the settling speed of the flocs significantly increase.

[0055] Embodiment 7: please refer to Figures 1-12 On the basis of embodiment 3, a detailed treatment method of fine chemical wastewater is provided in this example, which comprises the following steps: S1: Breaking and primary oxidation treatment S11: Water inlet and cyclone construction: open the delivery pump, pressurize the fine chemical wastewater to be treated, and pump it into the circular groove 4 of the breaking unit 1 through the tangential angle of the cyclone liquid inlet pipe 9, control the water inlet flow rate to form a high-speed cyclone in the circular groove 4, and ensure that the wastewater is uniformly distributed in the groove; S12: electrolytic complex breaking start: a direct current voltage is applied to the first anode plate 14 and the arc-shaped cathode plate 11 in the circular groove 4, the current density is controlled to form a radial electrolytic electric field, under the synergistic action of the rotational flow shear force and the electric field, the chemical bond of the complex in the wastewater is broken, the macromolecular organic matter is preliminarily degraded into small molecular organic matter, and the reaction time is controlled; S13: foam separation and liquid discharge: the foam generated in the complex breaking process rises to the liquid surface of the circular groove 4 through the rotational flow, enters the transition groove 15 through the overflow groove 10; the rotational flow in the circular groove 4 drives the rotation of the driving plate 25, and then drives the rotation of the foam collecting plate 23 of the separation assembly 8 in the transition groove 15, so as to scrape and collect the foam to the foam collecting groove 16, and then transport the foam to the foam treatment container through the foam outlet pipe 7; the clear liquid in the transition groove 15 is transported to the deep oxidation unit 2 through the discharge port one 17 and the liquid outlet pipe 6, the liquid level in the transition groove 15 is controlled to be stable, and the discharge speed is consistent with the overflow speed of the circular groove 4.

[0056] S2: deep electrochemical oxidation treatment S21: water inlet and flow channel guiding: the wastewater after complex breaking enters the groove one 26 from the feed port one 36 of the deep oxidation unit 2 through the liquid outlet pipe 6, flows along the S-shaped flow channel formed by the second anode plate 32 and the cathode plate 33, the water inlet flow is controlled to ensure the residence time of the wastewater in the groove one 26, and the water flow is ensured to fill the flow channel without cavitation phenomenon; S22: deep oxidation reaction: a direct current voltage is applied to the second anode plate 32 and the cathode plate 33, the current density is controlled, and strong oxidizing substances are generated on the electrode surface; the wastewater flows in the S-shaped flow channel, the flow channel turns and the disturbance block jointly form a turbulent flow, so that the small molecular organic matter and the strong oxidizing substances fully contact to occur deep oxidation reaction, and finally are degraded into harmless substances, and the temperature in the groove one 26 is controlled; S23: electrode self-cleaning maintenance: the self-cleaning program is started according to the set period, the electric push rod 29 is controlled to retract, the oxidation assembly is lifted out of the groove one 26, the vibration motor 31 is started, and the dirt attached to the electrode surface is removed under high-frequency vibration; after cleaning, the electric push rod 29 is controlled to extend, the oxidation assembly is put back into the groove one 26, and the deep oxidation treatment is restored; if the electrode is seriously worn, the second anode plate 32 or the cathode plate 33 is replaced through the bolts of the U-shaped mounting piece 34; S24: wastewater discharge after oxidation: the wastewater after deep oxidation treatment is discharged from the discharge port three 35 of the groove one 26, and is transported to the feed port two 42 of the flocculation unit 3 through the pipeline.

[0057] S3: electrocoagulation and solid-liquid separation treatment S31: flocculation zone preliminary treatment: the wastewater after deep oxidation enters the flocculation zone 44 of the flocculation unit 3 from the feed port two 42, a direct current voltage is applied to the plate electrolysis structure one 50, the current density is controlled, the metal ions are dissolved from the anode of the plate electrolysis structure one 50, the metal ions are converted into high-valence metal ions under the action of the electric field and oxygen in the air, and then hydrolysis is formed to form colloidal flocculation bodies, adsorb impurities in the wastewater and form fine flocculation bodies, and the flocculation reaction time is controlled; S32: flocculation zone preliminary treatment: the wastewater after deep oxidation enters the flocculation zone 44 of the flocculation unit 3 from the feed port two 42, a direct current voltage is applied to the plate electrolysis structure one 50, the current density is controlled, the metal ions are dissolved from the anode of the plate electrolysis structure one 50, the metal ions are converted into high-valence metal ions under the action of the electric field and oxygen in the air, and then hydrolysis is formed to form colloidal flocculation bodies, adsorb impurities in the wastewater and form fine flocculation bodies, and the flocculation reaction time is controlled; S33: sludge discharge and supernatant collection: the large-particle-size flocculation bodies in the aggregation zone 46 slide to the discharge port 49 under the action of gravity along the inclined surface 48, the valve of the discharge port 49 is opened according to the set period, and the sludge is discharged to the sludge treatment system; the supernatant in the aggregation zone 46 overflows through the slot 47, which is the treated water meeting the standard and can be directly discharged or reused.

[0058] S4: device regular maintenance and parameter adjustment S41: daily inspection: daily inspection of the electrode surface state, pipeline unobstructed condition and valve opening and closing flexibility of each unit to ensure that there is no leakage phenomenon in the key pipeline; S42: parameter optimization: according to the change of the water quality, the voltage, the current density and the water inflow of each unit are adjusted in time to adapt to the change of the water quality and ensure the treatment effect; S43: electrode replacement: when the electrode appears obvious passivation or coating peeling, the first anode plate 14, the arc-shaped cathode plate 11, the second anode plate 32 or the cathode plate 33 is replaced in time to ensure the stable treatment efficiency of the device.

[0059] The basic principle, main features and advantages of the present application are shown and described. It should be understood by those skilled in the art that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. A multi-stage electrochemical treatment device for fine chemical wastewater, characterized in that, Include: Broken unit (1) including circular groove (4), the top of the circular groove (4) is provided with a plurality of overflow grooves (10) arranged in a circumferential direction, the lower part of the circular groove (4) is provided with a cyclone inlet pipe (9), the coaxial anode structure is fixedly installed in the circular groove (4), and the cathode structure is arranged on the inner wall of the circular groove (4); It also includes a floating scum separation mechanism (5) arranged at the upper part of the circular groove (4); The depth oxidation unit (2) is used for receiving and processing wastewater treated by the broken unit (1), comprising a groove body (26), the two ends of the groove body (26) are respectively provided with a discharge port three (35) and a feeding port one (36), and a self-cleaning type deep oxidation mechanism is installed in the groove body (26); The flocculation unit (3) is used for receiving and processing wastewater treated by the depth oxidation unit (2), comprising a groove body two (41), the groove body two (41) is provided with a flocculation zone (44) and an aggregation zone (46).

2. A multi-stage electrochemical treatment device for fine chemical wastewater according to claim 1, characterized by, The anode structure includes an insulating column (12) fixedly installed on the inner bottom of the circular groove (4), the insulating column (12) is coaxial with the circular groove (4), a plurality of vertical installation grooves (13) are formed on the periphery of the insulating column (12), and the plurality of installation grooves (13) are arranged in a circumferential direction about the axis of the insulating column (12); A plurality of first anode plates (14) are installed on the periphery of the insulating column (12) through the plurality of installation grooves (13).

3. A multi-stage electrochemical treatment device for fine chemical wastewater according to claim 2, characterized in that, The cathode structure includes a plurality of arc-shaped cathode plates (11) attached to the inner wall of the circular groove (4), and the plurality of arc-shaped cathode plates (11) form a cylindrical cathode structure used in cooperation with the plurality of first anode plates (14) on the inner wall of the circular groove (4).

4. The multi-stage electrochemical treatment device for fine chemical wastewater according to claim 2, characterized by The floating scum separation mechanism (5) includes: A transition groove (15) is fixedly installed on the periphery of the circular groove (4) at the upper part, the top end of the transition groove (15) is higher than the top end of the circular groove (4), the bottom surface of the transition groove (15) is provided with a discharge port one (17), and the bottom end of the discharge port one (17) is fixedly connected with a liquid outlet pipe (6); A scum collecting groove (16) is fixedly installed on the periphery of the transition groove (15), the top end of the scum collecting groove (16) is higher than the top end of the transition groove (15), the bottom surface of the scum collecting groove (16) is provided with a discharge port two (18), the bottom end of the discharge port two (18) is fixedly connected with a scum outlet pipe (7), and the bottom end of the scum outlet pipe (7) guides the floating scum to a designated position through a conduit; And a separation assembly (8) is rotatably installed on the center of the top surface of the insulating column (12).

5. A multi-stage electrochemical treatment device for fine chemical wastewater according to claim 4, characterized by The separation assembly (8) includes a rotating shaft (19), and the bottom end of the rotating shaft (19) is rotatably installed on the center of the top surface of the insulating column (12); A plurality of circumferentially arranged connecting rods (20) are fixedly connected to the outer periphery of the rotating shaft (19) at the middle position, one end of the connecting rod (20) away from the rotating shaft (19) is fixedly connected with a vertical boom (24), and the bottom end of the boom (24) is fixedly installed with a driving plate (25) between the first anode plate (14) and the arc-shaped cathode plate (11); The top end of the rotating shaft (19) is fixedly provided with a mounting disc (21), the outer periphery of the mounting disc (21) is fixedly connected with a plurality of L-shaped rods (22) arranged in a circumferential array, one end of the L-shaped rod (22) away from the rotating shaft (19) is fixedly connected with a collecting plate (23) arranged in the transition groove (15), the collecting plate (23) is arranged obliquely, and the two ends of the collecting plate (23) are in sliding contact with the inner wall of the transition groove (15) and the outer periphery of the circular groove (4) respectively.

6. A multi-stage electrochemical treatment device for fine chemical wastewater according to claim 1, characterized by The self-cleaning deep oxidation mechanism comprises a self-cleaning mechanism, the self-cleaning mechanism comprises a mounting plate (28), the top surface of the groove body one (26) is provided with a mounting plate (28) at the middle position of both ends, the bottom surface of the mounting plate (28) is fixedly connected with a support plate (27) between the bottom surface of the groove body one (26). The top surface of the mounting plate (28) is fixedly provided with an electric push rod (29), the telescopic end of the electric push rod (29) is fixedly connected with a rectangular groove (39) after sliding through the mounting plate (28), and an installation assembly is arranged between the two rectangular grooves (39).

7. A multi-stage electrochemical treatment device for fine chemical wastewater according to claim 6, characterized by The installation assembly comprises an installation strip plate (30) arranged between the two rectangular grooves (39), the top surface of the installation strip plate (30) is fixedly provided with a vibration motor (31) arranged vertically along the axis, the top surface of the installation strip plate (30) is fixedly provided with a connecting block (37) at both end positions, the outer side surface of the connecting block (37) is fixedly connected with a sliding block (38) matched with the rectangular groove (39) at a position close to the top end, one end of the sliding block (38) away from the connecting block (37) slides into the rectangular groove (39) at the corresponding position, and the spring (52) is fixedly connected between one end of the sliding block (38) in the rectangular groove (39) and the inner end surface of the rectangular groove (39). The peripheral side of the sliding block (38) is embedded with a plurality of uniformly distributed rolling balls (40), and the sliding block (38) is in rolling contact with the installation strip plate (30) through the rolling balls (40).

8. A multi-stage electrochemical treatment device for fine chemical wastewater according to claim 7, characterized by The oxidation assembly comprises a plurality of U-shaped mounting pieces (34) fixedly mounted on the bottom surface of the installation strip plate (30), and the plurality of U-shaped mounting pieces (34) are arranged in an array along the length direction of the installation strip plate (30). The U-shaped mounting piece (34) is detachably fixedly provided with a second anode plate (32) or a cathode plate (33) through bolts; The plurality of second anode plates (32) and the cathode plates (33) are arranged alternately, one end of the second anode plate (32) is attached to the inner side of the groove body one (26), and the other end is spaced from the inner side of the groove body one (26), one end of the adjacent cathode plate (33) opposite to the second anode plate (32) is attached to the inner side of the groove body one (26), and the other end is spaced from the inner side of the groove body one (26), so that the plurality of cathode plates (33) and the second anode plates (32) form an S-shaped flow channel in the groove body one (26); The side surface of the cathode plate (33) and the second anode plate (32) is provided with a disturbance block.

9. The multi-stage electrochemical treatment device for fine chemical wastewater according to claim 1, characterized by One end of the groove body two (41) is provided with a feed inlet two (42), the other end is provided with a notch (47); the middle part of the groove body two (41) is provided with a partition (45), the partition (45) separates the groove body two (41) into the flocculation zone (44) and the aggregation zone (46), the flocculation zone (44) is located between the partition (45) and the feed inlet two (42), and the flocculation zone (44) is provided with an electrode plate electrolysis structure one (50); the aggregation zone (46) is provided with an electrode plate electrolysis structure two (51); The bottom surface of the flocculation zone (44) and the aggregation zone (46) is a slope (48), and the end close to the notch (47) is a lower section, and the lower end of the bottom surface of the flocculation zone (44) and the aggregation zone (46) is provided with a discharge port (49); The bottom surface of the groove body two (41) is fixedly installed with a supporting leg (43) close to the corner.

10. A method for treating fine chemical wastewater, characterized by, The following steps are included: S1: breakage and primary oxidation treatment; The fine chemical wastewater to be treated is introduced into the circular groove (4) of the breakage unit (1), and the wastewater forms a cyclone in the circular groove (4) through the cyclone inlet pipe (9); a voltage is applied to the anode structure and the cathode structure in the circular groove (4) to form an electrolysis electric field, and under the synergistic action of the cyclone and the electric field, the complex in the wastewater is broken and the macromolecular organic matter is preliminarily degraded; the floating scum generated in the process is separated and collected by the floating scum separation mechanism (5), and the clear liquid after treatment is delivered to the deep oxidation unit (2); S2: deep electrochemical oxidation treatment; The wastewater after breakage enters the groove body one (26) of the deep oxidation unit (2) and flows along the flow channel formed by the electrodes of the self-cleaning deep oxidation mechanism; a voltage is applied to the electrodes of the mechanism to generate strong oxidizing substances on the surface of the electrodes, and under the action of the flow field in the flow channel, the small molecular organic matter and the strong oxidizing substances fully react to achieve deep degradation; the self-cleaning program is started regularly to clean and maintain the electrodes, and the treated wastewater is delivered to the flocculation unit (3); S3: electroflocculation and solid-liquid separation treatment; The wastewater after deep oxidation enters the flocculation zone (44) of the flocculation unit (3), a voltage is applied to the electrode plate electrolysis structure one (50) to promote the anode dissolution of metal ions and form flocculation bodies, and the preliminary flocculation is completed; The wastewater then enters the aggregation zone (46), a low voltage is applied to the electrode plate electrolysis structure two (51) to make the small flocculation bodies grow; the grown flocculation bodies settle along the slope (48) and are discharged through the discharge port (49), and the supernatant is overflowed through the notch (47) to obtain treated water meeting the standard; S4: regular maintenance and parameter adjustment of the device; Regularly check the electrode state, pipeline smoothness and valve flexibility of each unit; adjust the voltage, current density and water inflow of each unit according to the change of water quality; when the electrode is passivated or worn, replace the corresponding electrode in time to ensure stable and efficient operation of the device.

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