Efficient treatment method of novel electric flocculation wastewater treatment equipment

Abstract

The invention discloses novel electric flocculation wastewater treatment equipment and an efficient treatment method. The equipment comprises a reaction tank system, an electrode assembly system, a power stirring system, a precipitation separation system and an automatic control system. The reaction tank system adopts a cylindrical main reaction tank, and a double-layer annular water distributor is arranged at the bottom of the reaction tank system; the electrode assembly system is of a three-layer coaxial annular electrode structure and comprises rotatable anode rings and fixed cathode rings which are arranged alternately. The power stirring system drives a curved surface stirring blade matched with the track of the electrode ring through a central shaft; the precipitation separation system adopts a conical precipitation chamber to be matched with an inclined plate precipitator and a spiral mud scraping blade; the automatic control system integrates a pH probe, a pulsating direct-current power supply and a laser particle size analyzer. The treatment method comprises the following steps: after the wastewater is uniformly distributed by the water distributor, carrying out electric flocculation reaction under the action of the rotating electrode and matched stirring, precipitating and separating flocs by the inclined plate, discharging sludge by the sludge scraping blade, and optimizing the operating parameters in real time in the whole process through the intelligent control system.

Description

Technical Field

[0001] The present invention provides a high-efficiency treatment method for wastewater treatment equipment, and particularly relates to a high-efficiency treatment method for novel electric flocculation wastewater treatment equipment. Background Art

[0002] The electro-flocculation wastewater treatment device is a device that removes pollutants from water through electrochemical action. Its core principle is to use metal electrodes to electrolyze and produce flocculants (such as Al3+, Fe 2+ ) and uses the electric field to cause pollutants to flocculate and precipitate. Traditional devices usually include a reaction tank, an electrode system, a stirring mechanism, and a precipitation zone, among which:

[0003] The reaction tanks are mostly rectangular or cylindrical in structure, with simple water inlet methods, which can easily lead to uneven water distribution;

[0004] The electrode system mostly uses parallel plates or single-layer ring electrodes with fixed electrode spacing, uneven current distribution, and easy passivation;

[0005] The stirring mechanism usually adopts mechanical stirring or aeration, which has a poor match with the electrode structure and poor mixing effect;

[0006] The sedimentation area is mostly ordinary inclined plate or horizontal flow sedimentation structure, the floc settling path is long, and secondary suspension is prone to occur.

[0007] The electric field distribution of traditional parallel plate or single-layer ring electrodes is uneven, and the current density fluctuates greatly, resulting in low electrolysis efficiency (only 50%-60%), and the electrode surface is easily passivated, requiring frequent replacement; mechanical stirring or aeration methods cannot coordinate with electrode movement, resulting in insufficient contact between reactants, the generated floc particles vary in size (10-200μm), and the sedimentation performance is poor; the water flow in the ordinary inclined plate sedimentation area is highly turbulent, the flocs are easily washed up, and the effluent turbidity is often >10NTU; relying on manual adjustment of pH and current parameters, it cannot respond to water quality changes in real time, and the operation stability is poor. Summary of the Invention

[0008] In order to solve the above problems, the present application provides an efficient treatment method for a new type of electrocoagulation wastewater treatment equipment, which solves the difficult problems of low electrode efficiency, poor flocculation effect, high energy consumption and insufficient automation. It adopts coaxial multi-layer rotating electrodes and intelligent stirring collaborative system, combined with conical inclined plate sedimentation and fuzzy-PID control technology to achieve efficient and stable wastewater treatment.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions: a novel electro-flocculation wastewater treatment equipment, comprising a reaction tank system, an electrode assembly system, a power stirring system, a sedimentation separation system and an automatic control system;

[0010] The reaction tank system comprises a cylindrical main reaction tank, a water inlet pipe arranged at the top of the main reaction tank and a drain pipe at the bottom, and an annular water distributor is provided at the bottom of the inner cavity of the main reaction tank;

[0011] The electrode assembly system comprises three coaxially arranged electrode rings, wherein the diameters of the electrode rings in each layer increase equidistantly from the inside to the outside, and adjacent electrode rings are fixedly connected by insulating brackets, and the electrode rings comprise a structure in which rotatable anode rings and fixed cathode rings are alternately arranged;

[0012] The power stirring system includes a rotating drive shaft arranged on the central axis of the main reaction tank, the upper part of the drive shaft is connected to the frequency conversion motor, and the lower part extends to the sedimentation and separation area and is provided with a spiral scraping blade;

[0013] The precipitation separation system comprises a conical precipitation chamber arranged in the lower half of the main reaction tank, the cone angle of which is 55-65 degrees, and an annular guide plate is provided on the inner wall of the conical precipitation chamber;

[0014] The automatic control system comprises a pH online monitoring probe, a current density adjustment module and a floc monitoring sensor, and each component is linked and controlled by a PLC controller.

[0015] Preferably, the diameter ratio of the three-layer electrode ring is 1:1.5:2.2, the anode ring adopts a mesh aluminum-titanium alloy electrode, the cathode ring adopts a honeycomb stainless steel electrode, and the distance between adjacent electrode rings is 50-80 mm.

[0016] Preferably, the rotary drive shaft is provided with three groups of stirring blades, each group of blades comprises four curved blades distributed in a cross shape, the curvature of the curved blades matches the annular trajectory of the electrode ring, and the distance between the blade end and the electrode ring is maintained at 10-15 mm.

[0017] Preferably, a multi-layer inclined plate settler is provided inside the conical precipitation chamber, each layer of inclined plates forms an angle of 60° with the horizontal plane, the spacing between adjacent inclined plates is 30-50 mm, and the surface of the inclined plates is provided with a nano coating.

[0018] Preferably, the annular water distributor comprises a double layer of perforated tubes, the upper layer of the perforated tubes has a pore size of 3-5 mm, the lower layer of the perforated tubes has a pore size of 1-2 mm, and the two layers of the perforated tubes are staggered at 45°.

[0019] Preferably: the pH online monitoring probe is set at 1 / 3 of the height of the main reaction tank and is connected to the dosing system through a PID control loop. The dosing system includes an acid and alkali dual-path dosing pipe, and the dosing port is located at the Y-type diverter of the water inlet pipe.

[0020] Preferably, the current density adjustment module adopts a pulsating DC power supply, the output waveform is a square wave pulse, the frequency is adjustable in the range of 0.5-5kHz, and the duty cycle is adjustable in the range of 30-70%.

[0021] Preferably, the floc monitoring sensor is a laser particle size analyzer, which is arranged at 2 / 3 of the height of the conical sedimentation chamber, and the monitoring signal is fed back to the current density adjustment module through fuzzy algorithm processing.

[0022] Preferably, the pitch of the spiral scraper blade is designed to decrease along the axial direction, with the upper pitch being 150 mm and the lower pitch being 80 mm, and the blade edge is provided with a wear-resistant ceramic coating.

[0023] A novel high-efficiency treatment method for wastewater treatment equipment using electrocoagulation is characterized by comprising the following steps:

[0024] A. Wastewater enters the annular water distributor through the water inlet pipe and achieves turbulent distribution through the double-layer perforated pipe;

[0025] B. pH online monitoring probe detects and adjusts wastewater to 6.5-7.5 in real time;

[0026] C. Start the pulsating DC power supply and variable frequency motor, and the electrode ring will produce an electric flocculation reaction under the rotating stirring;

[0027] D. The formed flocs are guided to the conical sedimentation chamber through the guide plate, and the solid-liquid separation is achieved through the inclined plate settler;

[0028] E. The clarified liquid is discharged through the drain pipe, and the precipitated sludge is collected by the spiral scraper blades and sent to the sludge outlet;

[0029] F. The floc monitoring sensor provides real-time feedback on floc characteristics and automatically optimizes current parameters and stirring intensity.

[0030] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0031] The present invention solves the problem of uneven current distribution of traditional parallel plate electrodes by adopting a coaxial three-layer ring electrode structure (diameter ratio 1:1.5:2.2) with a rotatable anode and a fixed cathode alternately arranged. At the same time, the combination of a mesh aluminum-titanium alloy anode and a honeycomb stainless steel cathode improves the electrode reaction efficiency and delays passivation; the innovative curved stirring blade (matching the trajectory of the electrode ring, with a spacing of 10-15mm) works in conjunction with the variable frequency drive system to achieve full mixing of the reactants and uniform formation of flocs; the conical sedimentation chamber (55-65° cone angle) is combined with the multi-layer The inclined plate settler (60° inclination, 30-50mm spacing) and the spiral scraper blades with decreasing pitch optimize the solid-liquid separation process; the entire system achieves real-time optimization of treatment parameters through intelligent linkage control of pH online monitoring, laser particle size analysis and pulsating DC power supply (0.5-5kHz adjustable square wave). Ultimately, while the electrode efficiency is increased to more than 90% and the effluent turbidity is ≤5NTU, energy consumption is reduced by 30%, completely solving the technical problems of traditional electrocoagulation equipment such as low current efficiency, insufficient mixing, poor sedimentation effect and insufficient automation.

[0032] Other advantages, objects and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be learned from the practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of a new type of electric flocculation wastewater treatment equipment of the present invention;

[0034] Figure 2 This is a flow chart of an efficient treatment method for a novel electric flocculation wastewater treatment device according to the present invention;

[0035] Figure 3 This is a logic diagram of an automatic control system for a high-efficiency treatment method of a novel electro-flocculation wastewater treatment device according to the present invention;

[0036] Figure 4 This is a system collaborative work flow diagram of a high-efficiency treatment method for a novel electric flocculation wastewater treatment device of the present invention; DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are for illustrative purposes only and do not represent the only implementation method.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains; the terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0040] like Figure 1 、 2 As shown in Figure 3, the present invention provides a new type of electro-flocculation wastewater treatment equipment, including a reaction tank system, an electrode assembly system, a power stirring system, a sedimentation separation system and an automatic control system. The reaction tank system adopts a cylindrical main reaction tank, and a double-layer annular water distributor is provided at the bottom (upper layer aperture 3-5mm, lower layer 1-2mm, 45° staggered distribution) to ensure uniform distribution of incoming water. The electrode assembly system innovatively adopts three layers of coaxial annular electrodes (diameter ratio 1:1.5:2.2), the anode ring is a rotatable mesh aluminum-titanium alloy electrode, and the cathode ring is a fixed honeycomb stainless steel electrode, which is connected by an insulating bracket with a spacing of 50-80mm, optimizing the electric field distribution and reducing passivation. The power stirring system drives three sets of cross-curved stirring blades through the central axis. The curvature of the blade matches the trajectory of the electrode ring, and the end spacing is 10-15mm to achieve efficient mixing. The sedimentation separation system utilizes a conical sedimentation chamber (cone angle 55-65°), a built-in 60° inclined plate settler (pitch 30-50mm, nano-coated), and spiral scraper blades (pitch decreasing from 150-80mm, ceramic-coated) to enhance solid-liquid separation efficiency. The automatic control system integrates a pH probe, a pulsating DC power supply (0.5-5kHz square wave), and a laser particle size analyzer, with intelligent regulation enabled by a PLC.

[0041] During the implementation of the present invention, each system achieves coordinated operation through precise structural connections and position coordination: the water inlet pipe at the top of the main reaction tank is connected to the water distributor by a flange, and the bottom drain pipe is welded and fixed to the cone bottom of the sedimentation chamber; the three-layer electrode ring is connected to the inner wall of the tank body through an insulating bracket, and the central axis passes through the central hole of the electrode ring to form a concentric structure; the stirring blade is connected to the central axis through a keyway and is driven by a motor via a coupling; the inclined plate settler is fixed to the inner wall of the sedimentation chamber through a support frame, and the various sensors of the control system are installed at preset monitoring points through waterproof joints. In terms of spatial layout, the water distributor is located at the bottom of the tank body, and the electrode assembly is precisely arranged 200mm above the water distributor; the stirring blade is located at the corresponding position of the electrode ring gap, the inclined plate settler is installed at the upper part of the sedimentation chamber, and the sludge scraping blade is set at the lower part; the pH probe is installed in the middle of the electrode area, and the laser particle size analyzer is arranged in the middle of the sedimentation area. This innovative combination has produced significant beneficial effects: (1) In terms of the synergistic effect of rotating electrodes and matching stirring, the rotatable anode ring and the curved blades move in the same direction to form laminar shear force, and micro-vortex mixing is achieved through the precise matching of electrode spacing (50-80mm) and blade spacing (10-15mm), which increases the current efficiency to 92%, a 35% increase over traditional equipment; (2) The synergistic effect of the composite sedimentation system is reflected in the cone structure (55-65° cone angle) combined with the inclined plate (60° inclination) to form a stable flow state, and the nano-coating (TiO2) reduces the floc adhesion resistance, so that the sedimentation rate reaches 2.5m / h, which is 60% higher than conventional equipment; (3) The optimization effect of the intelligent control system is manifested in the pulsating power supply (0.5-5kHz square wave) automatically adjusting parameters according to the floc size, and the PID control achieves a pH adjustment accuracy of ±0.1, which reduces the overall energy consumption by 32% and improves the operation stability by 45%.

[0042] like Figure 2 、 3 As shown in , 4, the efficient processing method of the device includes:

[0043] Water distribution and pH adjustment: wastewater forms turbulent flow through the double-layer perforated water distributor, and the pH probe adjusts the dosing system in real time (PID control) to maintain pH 6.5-7.5;

[0044] Electric flocculation reaction: Start the pulsating DC power supply (duty cycle 30-70%) and variable frequency motor, and the rotating anode ring and stirring work together to enhance floc formation;

[0045] Sedimentation and mud discharge: The flocs enter the inclined plate sedimentation area through the guide plate and settle quickly, and the spiral mud scraper blades adaptively discharge mud;

[0046] Intelligent optimization: The laser particle size analyzer monitors the floc characteristics in real time and dynamically adjusts the current density and stirring intensity through fuzzy algorithms. Technical advantages:

[0047] Electrode-stirring collaborative design increases current efficiency by 30% and reduces energy consumption by 20%;

[0048] Inclined plate + cone sedimentation increases sedimentation rate by 40%, and effluent turbidity is ≤5NTU;

[0049] Fully automatic control ensures stability and adapts to highly fluctuating water quality.

[0050] In the specific implementation of the present invention, the reaction tank system adopts a 316L stainless steel main reaction tank (standard size Φ2000×3500mm), the upper layer of the UPVC annular water distributor at the bottom has an upper perforated pipe diameter of 4±0.5mm and a hole spacing of 60mm, and a lower layer of the perforated pipe diameter of 1.5±0.2mm and a hole spacing of 30mm, and the water distribution pressure is 0.15-0.3MPa; the anode ring of the electrode assembly system adopts Al-Ti alloy mesh (Ti content 6%, mesh size 10×10mm), and the cathode ring is a 316L stainless steel honeycomb plate (pore size 8mm). The diameters of the three-layer electrode rings are Φ800mm, Φ1200mm and Φ1760mm respectively, and they are driven by a SEW reduction motor to rotate at a speed of 2-8rpm; the power stirring system is configured with ABB A 5.5kW variable frequency motor drives a 2205 duplex stainless steel stirring blade, the radius of which is 10mm equidistant from the electrode ring and the speed range is 30-120rpm. The inclined plate settler of the sedimentation separation system uses nano-TiO2-coated PP plates (single plate size 1000×500×3mm, 3 layers and 120 groups in total). The spiral scraper blade is 8mm thick, rotates at 0.5-2rpm, and the sludge concentration is ≥98%. The automatic control system is based on a Siemens S7-1200 PLC, equipped with a 0-500A adjustable pulsating power supply and a 1-1000μm range laser particle size analyzer, achieving a pH adjustment accuracy of ±0.1 and a 15-50A / m 2 Current density and fuzzy control response time of ≤5s. Example operation parameters show: processing flow 20m 3 / h, working voltage 12-24V DC, anode life ≥ 6 months, cathode ≥ 2 years, power consumption per ton of water 0.8-1.2kWh / m 3 , sludge moisture content ≤92%, the system can achieve water distribution uniformity >95%, current efficiency ≥90%, concentrated distribution of floc particle size 50-150μm, effluent SS ≤10mg / L and >95% operation stability.

[0051] The present invention fully integrates existing technical solutions and technical means during implementation: the main reaction tank is welded with standard 316L stainless steel, and its water inlet pipe and drain pipe are installed in accordance with the GB / T 9119 flange connection standard and the JB / T 81 welding standard respectively; the electrode assembly system draws on the insulation bracket installation method of industrial electrolytic cells, and uses a support frame made of G11-grade epoxy resin insulation material to fix the three-layer electrode ring to the inner wall of the tank body. Its rotation mechanism uses a SEW reduction motor with a standard coupling (GB / T 3852) to achieve power transmission; the power stirring system uses an ABB variable frequency motor (IEC 60034 standard) to drive the stirring shaft through a keyway connection (GB / T 1095 standard), and the curved surface shape of the stirring blade is optimized by three-dimensional fluid dynamics simulation software; the inclined plate settler of the sedimentation separation system is designed and installed in accordance with the HJ / T 283-2006 environmental protection standard, and its nano-coating is prepared using the mature sol-gel method; the PLC of the automatic control system (programmed according to the IEC 61131 standard) is controlled by a 4-20mA standard signal (IEC 60381) is connected to each sensor, and the pulsating power supply adopts IGBT inverter technology (IEC 60146 standard) to achieve waveform adjustment. During the operation of the equipment, the operating environment is first set according to the GB 50034 lighting standard, and the initial parameters are set through the HMI human-machine interface (IEC 61010 standard). After startup, the following operations are automatically executed: 1) The water inlet pump (GB / T 5656) sends the wastewater to the water distributor after being measured by the flow meter (JJG 1030); 2) The dosing pump (HG / T 3188) adds the chemical according to the signal of the ORP sensor (JJG 119); 3) The electrode system operates under the power supply of DC power supply (GB / T 17478), and the current and voltage are monitored by the digital display (GB / T13978); 4) The stirring system adjusts the speed according to the feedback of the turbidity meter (HJ / T 98); 5) The sludge pump (GB / T 5657) adjusts the speed according to the timing or liquid level signal (GB / T The entire process complies with the requirements of GB 18918 Pollutant Discharge Standard for Wastewater Treatment Plants and is remotely monitored through the SCADA system (IEC 60870 standard).

[0052] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A new type of electrocoagulation wastewater treatment equipment, characterized by: It includes reaction tank system, electrode assembly system, power stirring system, precipitation separation system and automatic control system; The reaction tank system comprises a cylindrical main reaction tank, a water inlet pipe arranged at the top of the main reaction tank and a drain pipe at the bottom, and an annular water distributor is provided at the bottom of the inner cavity of the main reaction tank; The electrode assembly system comprises three coaxially arranged electrode rings, wherein the diameters of the electrode rings in each layer increase equidistantly from the inside to the outside, and adjacent electrode rings are fixedly connected by insulating brackets, and the electrode rings comprise a structure in which rotatable anode rings and fixed cathode rings are alternately arranged; The power stirring system includes a rotating drive shaft arranged on the central axis of the main reaction tank, the upper part of the drive shaft is connected to the frequency conversion motor, and the lower part extends to the sedimentation and separation area and is provided with a spiral scraping blade; The precipitation separation system comprises a conical precipitation chamber arranged in the lower half of the main reaction tank, the cone angle of which is 55-65 degrees, and an annular guide plate is provided on the inner wall of the conical precipitation chamber; The automatic control system comprises a pH online monitoring probe, a current density adjustment module and a floc monitoring sensor, and each component is linked and controlled by a PLC controller.

2. The novel electrocoagulation wastewater treatment equipment according to claim 1 is characterized in that: The diameter ratio of the three-layer electrode ring is 1:1.5:2.

2. The anode ring adopts a mesh aluminum-titanium alloy electrode, the cathode ring adopts a honeycomb stainless steel electrode, and the distance between adjacent electrode rings is 50-80 mm.

3. The novel electro-flocculation wastewater treatment equipment according to claim 1 is characterized in that: The rotating drive shaft is provided with three groups of stirring blades, each group of blades includes four curved blades distributed in a cross shape, the curvature of the curved blades matches the annular trajectory of the electrode ring, and the distance between the blade end and the electrode ring is maintained at 10-15mm.

4. The novel electrocoagulation wastewater treatment equipment according to claim 1 is characterized in that: A multi-layer inclined plate settler is arranged inside the conical sedimentation chamber. Each layer of inclined plates forms an angle of 60° with the horizontal plane. The spacing between adjacent inclined plates is 30-50 mm. The surface of the inclined plates is provided with a nano coating.

5. The novel electro-flocculation wastewater treatment equipment according to claim 1 is characterized in that: The annular water distributor comprises a double layer of perforated pipes, wherein the aperture of the upper layer of perforated pipes is 3-5 mm, and the aperture of the lower layer of perforated pipes is 1-2 mm, and the two layers of perforated pipes are staggered at 45 degrees.

6. The novel electro-flocculation wastewater treatment equipment according to claim 1 is characterized in that: The pH online monitoring probe is set at 1 / 3 of the height of the main reaction tank and is connected to the dosing system through a PID control loop. The dosing system includes an acid and alkali dual-path dosing pipe, and the dosing port is located at the Y-shaped diverter of the water inlet pipe.

7. The novel electro-flocculation wastewater treatment equipment according to claim 1 is characterized in that: The current density adjustment module adopts a pulsating DC power supply, the output waveform is a square wave pulse, the frequency can be adjusted in the range of 0.5-5kHz, and the duty cycle can be adjusted in the range of 30-70%.

8. The novel electro-flocculation wastewater treatment equipment according to claim 1 is characterized by: The floc monitoring sensor adopts a laser particle size analyzer, which is set at 2 / 3 of the height of the conical sedimentation chamber. The monitoring signal is fed back to the current density adjustment module through fuzzy algorithm processing.

9. The novel electro-flocculation wastewater treatment equipment according to claim 1 is characterized in that: The pitch of the spiral scraper blade is designed to decrease along the axial direction, with the upper pitch being 150 mm and the lower pitch being 80 mm. The blade edge is provided with a wear-resistant ceramic coating.

10. A new type of efficient treatment method for wastewater treatment equipment using electrocoagulation, characterized in that: The following steps are involved: A. Wastewater enters the annular water distributor through the water inlet pipe and achieves turbulent distribution through the double-layer perforated pipe; B. pH online monitoring probe detects and adjusts wastewater to 6.5-7.5 in real time; C. Start the pulsating DC power supply and variable frequency motor, and the electrode ring will produce an electric flocculation reaction under the rotating stirring; D. The formed flocs are guided to the conical sedimentation chamber through the guide plate, and the solid-liquid separation is achieved through the inclined plate settler; E. The clarified liquid is discharged through the drain pipe, and the precipitated sludge is collected by the spiral scraper blades and sent to the sludge outlet; F. The floc monitoring sensor provides real-time feedback on floc characteristics and automatically optimizes current parameters and stirring intensity.

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