High-efficiency totally-enclosed electric flocculation water treatment equipment

Abstract

The utility model relates to the technical field of industrial wastewater treatment, and provides electric flocculation equipment. The equipment adopts a horizontal cylindrical totally-closed structure, and mainly comprises a water inlet and outlet system, a dosing port, a power supply system, an electrochemical reaction system, a slag scraping system and a power system. The equipment is divided into an upper half structure and a lower half structure, and has the advantages that the upper shell is convenient to disassemble, the polar plates are convenient to replace and overhaul; the anode plate in the equipment is specially designed, so that the anode plate can be replaced without dismounting the shaft; the equipment is provided with a polar plate cleaning scraper, so that polar plate scaling and deposition of sludge among polar plates can be avoided, and meanwhile, a stirring effect is achieved, so that wastewater fully contacts and reacts with the polar plates; the full-closed structure of the equipment can prevent the foam problem from influencing the normal operation of the equipment; the cleaning scraper blade of the equipment adopts variable frequency speed regulation, and can be regulated according to specific conditions; the anode plate is provided with three water passing holes, and compared with a single-hole design, the diameter of the holes is reduced, so that the water level of the passing holes is improved, and air at the top of the upper shell is prevented from being gathered; the equipment is low in energy consumption and has good safety performance.

Description

TECHNICAL FIELD

[0001] The utility model discloses a kind of electroflocculation equipment for industrial wastewater treatment, and specific content relates to a kind of electroflocculation equipment for industrial wastewater treatment. BACKGROUND

[0002] Now, with the continuous improvement of urbanization level and the continuous development of economy, the discharge of industrial wastewater makes water quality worse, and electroflocculation technology, as a new water treatment technology, has the advantages of high treatment efficiency, good treatment effect, simple operation, high automation degree, less sludge, less secondary pollution, etc., and it can remove COD Cr , color, heavy metals, oil and other pollutants in wastewater. Electroflocculation can be used alone, or as a front-end pretreatment and end-of-pipe advanced treatment process for industrial wastewater.

[0003] Electroflocculation is a technology that uses electrochemical reaction principle to remove pollutants in water. Its working principle mainly includes the following three continuous stages.

[0004] (1) Electrolytic reaction: under the action of an external electric field, metal electrodes (usually aluminum or iron) as anode undergo oxidation reaction to generate corresponding metal ions. For example, aluminum anode generates aluminum ions (Al 3+ ), and iron anode generates iron ions (Fe 2+ ). These metal ions then combine with hydroxyl ions in water to form small particles of metal hydroxide.

[0005] (2) Suspended matter destabilization: suspended particles and colloidal pollutants in water lose stability under the action of metal hydroxide. This is because metal hydroxide has a large specific surface area and adsorption capacity, which can adsorb and neutralize the charge on the surface of suspended matter, thereby destroying its stability.

[0006] (3) Floc formation: the particles of destabilized pollutants and metal hydroxide collide and aggregate with each other to form large flocs visible to the naked eye. These flocs, due to their greater density than water, settle to the bottom or are carried to the water surface by bubbles to form a scum layer, thereby achieving the purpose of being separated from water.

[0007] In summary, electroflocculation technology not only has the advantages of simple equipment, small footprint, easy maintenance, etc., but also does not need to add any chemical reagent, and the amount of sludge produced is small and easy to handle. Therefore, it has been widely used in the field of water treatment.

[0008] At present, most of the electric flocculation equipment adopts open type, which has the following defects: (1) operating at normal pressure, large distance between the plates, long residence time, large current and voltage, thus large power consumption, large consumption of anode plate, poor safety; (2) low flow rate, less contact between the wastewater and the plates, affecting the electrolysis reaction; (3) large equipment size, large occupied space; (4) easy scaling on the surface of the plates, easy passivation, which cannot be avoided even by using the positive and negative electrode reversal method in many wastewater treatments, affecting the electric flocculation effect; (5) sludge deposition often occurs in the tank between the plates, which needs to be cleaned regularly; (6) micro-bubbles generated in the electrolysis process directly escape, which cannot be used in the subsequent process by using the air flotation method for solid-liquid separation; (7) micro-bubbles generated in the electrolysis process of some wastewater directly escape, which will produce foam, thus affecting the normal operation of the electric flocculation system.

[0009] In order to overcome the shortcomings of the open type electric flocculation equipment, some equipment currently adopts a closed type. However, the following defects still exist: (1) difficult to check and maintain the equipment; (2) difficult to replace the electrode plate; (3) no cleaning function for the plates, which needs to be cleaned manually. For example, the Chinese patent document CN201362607Y discloses an electric flocculation equipment for industrial wastewater and domestic sewage treatment. The equipment adopts a fully closed and vertical cylindrical structure, but the equipment has the following defects: (1) the equipment must be disassembled and reassembled for checking and maintenance and replacement of the anode plate, which causes long operation time, high technical requirements for the disassembly and assembly of the operators, especially for large equipment, which requires special assembly equipment, thus bringing great difficulty to the users, which affects the promotion and application of the equipment in actual projects; (2) there are many sealing points in the equipment, which often leak during use.

[0010] For another example, the Chinese patent document CN118206195A discloses an electric flocculation reaction unit and an electric flocculation reaction device. The electric flocculation reaction unit of the equipment changes the flocculation structure of the pool into a pipeline structure, and the obvious defects of the equipment are: (1) cannot avoid the scaling and passivation of the plates, which needs to be cleaned manually regularly, and cannot be used for wastewater containing high concentration of calcium and magnesium ions; (2) high cost for replacing the plates; (3) large occupied area compared with the same processing capacity equipment. SUMMARY

[0011] The utility model discloses to solve the shortcomings of open type and ordinary closed type electric flocculation, provide a kind of for printing and dyeing wastewater, electroplating wastewater, tannery wastewater, emulsion wastewater, oilfield wastewater and the electric flocculation improved equipment of industrial wastewater, ensure the simplicity of the cleaning of electrode plate, anode plate replacement operation, and avoid the generation of foam.

[0012] The equipment includes an inlet / outlet water system, a chemical dosing port, a power supply system, an electrochemical reaction system, a sludge scraping system, and a power system.

[0013] In the power supply system, the input power is 380V / 50HZ or 220V / 50HZ AC, and the output power is 0-18V DC.

[0014] like Figure 1 , 2 As shown in Figure 3, the inlet and outlet water system mainly includes a sewage inlet pipe 17 and an outlet pipe 18; the dosing port mainly includes a coagulant inlet pipe 19 and a flocculant inlet pipe 20, and whether to add coagulant and flocculant depends on the actual situation of the wastewater.

[0015] The power system mainly consists of shaft 15, bearings 4, reducer 1, and coupling 5. Shaft 15 is located between the upper shell 8 and the lower shell 22, and is supported at both ends by bearings 4. Shaft 15 is connected to the shaft of reducer 1 via coupling 2, which is equipped with a protective cover 3. The reducer uses a variable frequency speed control motor to control the speed of shaft 15, which is generally between 5-30 rpm, and the speed is adjusted according to the type of wastewater and the scaling condition of the electrode plates. Shaft 15... Figure 4 As shown, the shape is as follows: the two ends where bearings 4 are installed and the mechanical seal 5 are installed are cylindrical, and the middle position where the cleaning scraper 14 and the sealing ring 21 are installed is hexagonal. The shaft 15 is made of stainless steel with a polytetrafluoroethylene outer sheath.

[0016] The electrochemical reaction system consists of an anode plate 12, a cathode plate 13, a cathode busbar 23, and an anode busbar 6. The anode plate is made of iron or aluminum, and the cathode plate is made of S304 stainless steel.

[0017] The electrocoagulation device adopts a horizontal cylindrical fully enclosed structure. The lower shell 22 is fixed to the frame 16, and the upper shell 8 and the lower shell 22 are connected and fixed by upper and lower shell connecting bolts 25. Lifting lugs 24 are installed on both sides of the upper shell 8. This structure is adopted because it is convenient to operate by simply lifting the upper shell 8 with the lifting lugs 24 when inspecting the equipment or replacing the anode plate 12. The upper and lower shells are made of S304 stainless steel with polytetrafluoroethylene insulation.

[0018] like Figure 5 , 6 A sealing ring 27 is installed between the cathode plate 13 and the shaft 15. The sealing ring 27 is made of polytetrafluoroethylene and is frustoconical in shape (e.g., ...). Figure 11 As shown), Figure 11 The two sections of the sealing ring 27 shown have diameters d1 and d2, respectively. Figure 5 The diameter of one end of the cone-shaped hole in the cathode plate shown is... The diameter of the other end of the frustum hole The sealing stopper 27 is in clearance fit with the conical hole of the cathode plate 13. The conical design facilitates installation and clearance fit for sealing.

[0019] As shown in Figure 7 , 8 , the lower part of the anode plate 12 is designed as a notch. The notch is designed to replace the anode plate 12 without disassembling the shaft 15. An anode stopper 21 is arranged at the notch. The anode stopper is made of polytetrafluoroethylene. As shown in Figure 12 , Figure 12 , the anode stopper 21 has a conical hole. The diameter of one end of the conical hole is , and the diameter of the other end of the conical hole is . The conical hole is in clearance fit with the conical sealing stopper 27. The sealing stopper 27 is installed between the inner hole of the anode stopper 21 and the shaft 15. The sealing stopper 27 is fixed between the shaft 15 by a sealing stopper fixing screw 31. As shown in Figure 7 , 12 , the left upper and right three sides of the anode stopper are provided with anode stopper triangular grooves 35, which are in fit with the triangular ribs 34 of the lower notch of the anode plate to form a seal.

[0020] As shown in Figure 9 , the upper and lower shells have plate positioning grooves 29 for fixing the anode plate 12 and the cathode plate 13.

[0021] The shaft 15 and the upper and lower half shells are sealed by a mechanical seal 5. The plate connecting head and the upper and lower half shells are sealed by an O-shaped sealing ring 11, which is pressed by a sealing gland 9 and fixed on the upper and lower half shells by a sealing gland screw 10. The sealing gland is made of polytetrafluoroethylene insulating material. The connection between the upper and lower shells is sealed by a rubber pad.

[0022] The anode connecting copper bar 6 and the cathode connecting copper bar 23 of the electrochemical reaction system are located outside the electrochemical reaction system and connected to the anode plate 12 and the cathode plate 13 by connecting bolts 7, respectively. The connecting head of the anode plate 12 is embedded in the opening of the upper half shell 8 and extends out of the shell. The anode plate 12 is fixed by a sealing gland 9, which is sealed by an O-shaped sealing ring 11 and fixed by a sealing gland screw 10. The connecting head of the cathode plate 13 is embedded in the opening of the lower half shell 22 and extends out of the shell. The cathode plate 13 is fixed by a sealing gland 9, which is sealed by an O-shaped sealing ring 11.

[0023] The water inlet and outlet system is arranged in the lower half shell 22 of the device, with the water inlet pipe 17 arranged on the left side and the water outlet pipe 18 arranged on the right side. The dosing port is arranged in the lower half shell 22 of the device, with the coagulant inlet pipe 19 arranged on the left side of the bottom and the flocculant inlet pipe 20 arranged on the right side of the bottom. In actual operation, the coagulant enters the electrocoagulation device through the coagulant inlet pipe 19, the sewage enters the electrocoagulation device through the water inlet pipe 17, and the sewage passes through the water passing holes 28 of the anode plate and the water passing holes 26 of the cathode plate in turn after the coagulant is added, and the electrochemical reaction is carried out between the plates. The water passing holes 26 of the cathode plate are arranged at the lower part of the cathode plate, and the water passing holes 28 of the anode plate are arranged at the upper part of the anode plate, so that the wastewater can be folded between the plates to increase the contact between the wastewater and the plates as much as possible. As shown in Figure 5 three water passing holes are arranged on the anode plate, the center of one of the water passing holes is on the vertical center line of the anode plate circle, and the included angle between the line connecting the centers of the other two water passing holes and the vertical center of the anode plate circle is 10°. The total cross-sectional area of the three holes is equal to the cross-sectional area of the water passing hole of the cathode plate. Compared with the single-hole design, the diameter of the hole is reduced, the water level of the hole is increased, and the accumulation of air at the top of the upper shell is avoided.

[0024] The slag scraping system is arranged with one cleaning scraper 14 between each adjacent anode plate 12 and cathode plate 13. The cleaning scraper 14 is made of wear-resistant high-molecular plastic, and has a shape as shown in Figure 10 The lower part of the cleaning scraper 14 is a hexagonal hole, which is sleeved on the hexagonal shaft and fixed on the shaft 15 by the cleaning scraper screw 30. The width H1 of the cleaning scraper is 6-8 mm larger than the distance H2 between the anode plate and the cathode plate, and the cleaning scraper is made of high-molecular plastic with certain elasticity. The convex rib 33 of the cleaning scraper 14 has elasticity, so that the cleaning scraper can closely contact with the surface of the plate when rotating.

[0025] Advantages of this utility model: (1) The electrocoagulation device is divided into an upper structure and a lower structure. The upper shell is easy to disassemble, making it convenient to replace the electrode plates and for maintenance; (2) The anode plate is specially designed so that the anode plate can be replaced without removing the shaft; (3) Utilizing the microbubbles generated during the electrocoagulation process, the electrocoagulated water enters the downstream water receiving tank. With a sludge scraping device, it can be used as an air flotation tank; (4) The equipment is equipped with an electrode plate cleaning scraper, which avoids scale buildup or oil adhesion on the electrode plates and also prevents sludge from settling between the electrode plates. The cleaning scraper also acts as a stirrer. (5) The equipment has a short residence time, generally only 2-3 minutes; (6) The distance between the plates is small, usually 20-30 mm, and the voltage used is 0-18V DC. The current and voltage used are small, so the energy consumption is low and the safety is high; (7) The cleaning scraper speed is adjusted between 5-30 rpm according to the actual situation; (8) The fully enclosed structure can avoid the foam problem from affecting the normal operation of the equipment; (9) The equipment is pressurized and there are no special requirements for the installation position. Attached Figure Description

[0026] Figure 1 This is a front view of the structure of the electrocoagulation equipment of this patent.

[0027] Figure 2 This is a top view of the structure of the electrocoagulation equipment in this patent.

[0028] Figure 3 This is a side view of the structure of the electrocoagulation equipment of this patent.

[0029] Figure 4 This is a schematic diagram of the shaft of the electrocoagulation equipment of this patent.

[0030] Figure 5 This is a schematic diagram of the cathode plate of the electrocoagulation device of this patent (the left image is a front view, and the right image is a side view).

[0031] Figure 6 This is a schematic diagram of the assembly of the cathode plate, shaft, and sealing ring of the electrocoagulation equipment of this patent.

[0032] Figure 7 This is a schematic diagram (three views) of the anode plate of the electrocoagulation equipment of this patent.

[0033] Figure 8 This is a schematic diagram of the assembly of the anode plate, shaft, sealing ring, and anode baffle of the electrocoagulation equipment of this patent.

[0034] Figure 9 This is a schematic diagram of the positioning grooves of the anode and cathode plates in the electrocoagulation equipment of this patent (the left figure shows the position of the anode plate and the positioning groove, and the right figure shows the position of the cathode plate and the positioning groove).

[0035] Figure 10The patent is a clean scraper diagram (three views).

[0036] Figure 11 The patent is a sealing baffle diagram (left view is the front view, and the right view is the side view).

[0037] Figure 12 The patent is an anode baffle diagram (three views).

[0038] Figures 1-12 In the middle, 1- speed reducer 2- coupling 3- guard 4- bearing 5- mechanical seal 6- anode copper bar 7- connecting bolt 8- upper half shell 9- sealing gland 10- sealing gland screw 11- O type sealing ring 12- anode plate 13- cathode plate 14- clean scraper 15- shaft 16- frame 17- water inlet pipe 18- water outlet pipe 19- coagulant inlet pipe 20- flocculating agent inlet pipe 21- anode baffle 22- lower half shell 23- cathode copper bar 24- lifting lug 25- upper and lower shell connecting bolt 26- cathode plate water hole 27- sealing baffle 28- anode plate water hole 29- plate positioning groove 30- clean scraper fixing screw 31- sealing baffle fixing screw 32- conical hole 33- clean scraper rib 34- anode plate lower notch triangular rib 35- anode baffle triangular groove. DETAILED DESCRIPTION

[0039] As Figure 1 shown, the electric flocculation equipment for industrial wastewater and domestic sewage treatment is a horizontal cylindrical fully enclosed structure, including an inlet and outlet water system, a dosing port, a power supply system, an electrochemical reaction system, a slag removal system, and a power system.

[0040] The upper half shell 8 and the lower half shell 22 of the electric flocculation equipment are connected and fixed by the upper and lower shell connecting bolts 25, which makes disassembly more convenient, thereby facilitating replacement of the plates and equipment maintenance. The lifting lugs 24 are installed on both sides of the upper half shell 8 for lifting the upper half shell.

[0041] The inlet and outlet water system mainly includes a sewage inlet pipe 17 and an outlet pipe 18; the dosing port mainly includes a coagulant inlet pipe and a flocculating agent inlet pipe. The inlet and outlet water system and the dosing port are arranged on the lower half shell 22 of the equipment.

[0042] The power supply system includes a positive electrode and a negative electrode. In the power supply system, the input power supply adopts 380V / 50HZ or 220V / 50HZ alternating current, and the output power supply adopts 0-18V direct current.

[0043] In the electrochemical reaction system, the lower shell 22 is fixed to the frame 16, and several sets of electrode units are fixed between the upper shell 8 and the lower shell 22. Each set of electrode units includes an anode plate 12, a cathode plate 13, and electrode wiring copper busbars. The electrode wiring copper busbars include an anode wiring copper busbar 6 and a cathode wiring copper busbar 23, which are respectively connected to the positive and negative terminals of the power supply system. An anode plate water passage hole 28 is provided on the anode plate 12, and a cathode plate water passage hole 26 is provided on the cathode plate 13. The lower part of the anode plate 12 is designed with a notch, and an anode baffle 21 is provided at the notch. The anode baffle is made of polytetrafluoroethylene (PTFE) and has corrosion resistance. The anode baffle 21 has a frustum-shaped hole, which fits with a frustum-shaped sealing ring 27 with a clearance fit. The two sections of the sealing ring 27 have diameters d1 and d2, respectively, and the diameter of one end of the frustum-shaped hole is... The diameter of the other end of the frustum hole It is clearance-fitted with the frustoconical sealing ring 27. The sealing ring 27 is fixed to the shaft 15 by the sealing ring fixing screw 31. Figure 7 , 12 As shown, the anode baffle has triangular grooves 35 on its upper left and right sides, which cooperate with the triangular protrusions 34 at the lower notch of the anode plate to form a seal. The upper and lower housings contain electrode positioning grooves 29 for fixing the anode plate 12 and the cathode plate 13. A sealing ring 27 is installed between the cathode plate 13 and the shaft 15. The sealing ring 27 is made of polytetrafluoroethylene and is frustoconical in shape. The diameter of one end of the frustoconical hole on the cathode plate is... The diameter of the other end of the frustum hole Thus, the sealing ring 27 and the cathode plate 13 are clearance-fitted within the conical hole. The shaft 15 is sealed to the upper and lower housings using a mechanical seal 5. The electrode plate connector is sealed to the upper and lower housings using an O-ring 11, tightened with a sealing cap 9, and secured to the upper and lower housings by sealing cap screws 10. The sealing cap is made of polytetrafluoroethylene insulating material, and the connection between the upper and lower housings is sealed with a rubber gasket.

[0044] In the slag scraping system, the cleaning scraper 14 is located between the anode plate 12 and the cathode plate 13 in each electrode unit, and the cleaning scraper 14 is fixed to the shaft 15 by the cleaning scraper fixing screw 30.

[0045] The power system mainly consists of shaft 15, bearings 4, reducer 1, and coupling 5. Shaft 15 is located between the upper shell 8 and the lower shell 22, and is supported at both ends by bearings 4. Shaft 15 is connected to the shaft of reducer 1 via coupling 2, which is equipped with a protective cover 3. The reducer uses a variable frequency speed control motor to control the shaft speed, which is between 5-30 rpm. The speed is adjusted according to the type of wastewater and the actual scaling conditions of the electrode plates. Shaft 15... Figure 4As shown, the shape is: two end mounting bearing 4 position and installation mechanical seal 5 position is cylindrical, the middle installation cleaning scraper 14 and seal baffle 21 position is hexagonal column shape. The material of shaft 15 is stainless steel outer package polytetrafluoroethylene.

[0046] In actual work process, industrial wastewater enters into the electric flocculation equipment through water inlet pipe 17, and the coagulant is added into the equipment through coagulant inlet pipe 19 according to the need, the coagulant and sewage are fully mixed and contacted through the stirring action of cleaning scraper 14, the sewage passes through the water hole 28 of anode plate and the water hole 26 of cathode plate of each electrolytic unit in turn, and the electrochemical reaction is carried out between the plates, and the reaction product generated on the plate is removed through the cleaning scraper 14. When the sewage flows into the last electrolytic unit, the flocculating agent enters into the equipment through flocculating agent inlet pipe 20, and the flocculating agent and sewage are fully mixed and contacted through the stirring action of cleaning scraper 14, and the generated flocculation group is removed in the subsequent air flotation tank. The effluent after flocculation treatment is discharged through water outlet pipe 18.

[0047] Example 1: the effect of the utility model for treating printing and dyeing wastewater.

[0048] In the electric flocculation process, the dosage of the added reagent: PAC is 200ppm, and PAM is 10ppm:

[0049] .

[0050] Example 2: the effect of the utility model for treating electroplating zinc wastewater.

[0051] In the electric flocculation process, the dosage of the added reagent: PAC is 300ppm, and PAM is 15ppm:

[0052] .

Claims

1. A high efficiency totally enclosed electrocoagulation water treatment device, characterized in that: The application relates to a horizontal cylindrical full-closed structure, which mainly comprises a water inlet and outlet system, a dosing port, a power supply system, an electrochemical reaction system, a slag scraping system and a power system, the input power supply of the power supply system adopts 380V / 50HZ or 220V / 50HZ alternating current, and the output power supply adopts 0-18V direct current; the shell adopts a two-half structure, the lower half shell is fixed on a machine frame, the upper half shell is connected with the lower half shell through upper and lower shell connecting bolts, and lifting lugs are arranged on the two sides of the upper half shell; the water inlet and outlet system is arranged in the lower half shell of the equipment, a water inlet pipe is arranged on the left side of the lower half shell, and a water outlet pipe is arranged on the right side of the lower half shell; the anode wire copper bar and the cathode wire copper bar in the electrochemical reaction system are located outside the electrochemical reaction system and are connected with anode plates and cathode plates through connecting bolts, the upper and lower shells have plate positioning grooves for fixing the anode plates and the cathode plates, the anode plates and the cathode plates are circular, a water passing hole is arranged in the lower part of the cathode plate, three water passing holes are arranged in the upper part of the anode plate, the center of one of the water passing holes is on the vertical center line of the anode plate circle, and the included angles between the connecting lines of the centers of the other two water passing holes and the vertical center of the anode plate circle are both 10 degrees, and the total cross-sectional area of the three holes is equal to that of the water passing hole of the cathode plate.

2. The electrocoagulation water treatment device of claim 1, wherein: A sealing baffle is arranged between the cathode plate and the shaft, the sealing baffle is designed in a frustum shape, and the sealing baffle is fixed between the shaft through a sealing baffle fixing screw.

3. The electrocoagulation water treatment device of claim 1, wherein: The lower part of the anode plate is designed as a notch, an anode baffle is arranged at the notch, the inner hole of the anode baffle is designed in a frustum shape, a sealing baffle is arranged between the inner hole of the anode baffle and the shaft, and the sealing baffle is fixed between the shaft through a sealing baffle fixing screw.

4. The electrocoagulation water treatment device of claim 1, wherein: A cleaning scraper is arranged between each adjacent anode plate and cathode plate in the slag scraping system, the cleaning scraper is made of wear-resistant high polymer plastic, the lower part is an inner hexagonal hole, the cleaning scraper is fixed on the hexagonal shaft through a cleaning scraper fixing screw, the cleaning scraper has a convex rib and is elastic, and the cleaning scraper can tightly adhere to the plate.

5. The electrocoagulation water treatment device of claim 1, wherein: In the power system, the shaft is arranged between the upper half shell and the lower half shell and is supported by bearings at both ends, the shaft is connected with the shaft of a speed reducer through a shaft coupling, a protective cover is arranged outside the shaft coupling, and the speed of the shaft is controlled by a frequency conversion speed regulating motor; the shape of the shaft is as follows: the positions of the bearings and the mechanical seals at both ends are cylindrical, the part in the shell is hexagonal, and the shaft is made of stainless steel and is coated with polytetrafluoroethylene.

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