Segmented electro-chemical coupled water treatment system and method for treatment of recycled water

Abstract

The application discloses a segmented electrochemical method coupled water treatment system and method suitable for circulating water reuse treatment, which comprises an electrostatic water treatment chamber, a water conveying pipeline, an ultrasonic wave generator, an electric flocculation water treatment device and a settler; the outlet of the electrostatic water treatment chamber is connected with the inlet of the electric flocculation water treatment device through the water conveying pipeline, the outlet of the electric flocculation water treatment device is connected with the inlet of the settler, and the water conveying pipeline is provided with an ultrasonic wave transducer; the ultrasonic wave transducer is connected with the ultrasonic wave generator; the system and the method can efficiently prevent and remove scale without adding reagents.

Description

Technical Field

[0001] This invention belongs to the field of green water treatment and relates to a segmented electrochemically coupled water treatment system and method suitable for circulating water reuse treatment. Background Technology

[0002] Currently, chemical dosing is the most widely used method for industrial circulating cooling water. Although this method can effectively prevent scaling, it cannot reduce the scale-forming ions in the circulating water, resulting in low water utilization efficiency. High hardness and alkalinity lead to low concentration ratios, reduced circulation times, and increased wastewater discharge, causing a significant waste of water resources, which is inconsistent with the concept of green development. Therefore, how to achieve efficient scale inhibition and removal without adding chemicals has become an important issue in this industry. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a segmented electrochemical coupling water treatment system and method suitable for circulating water reuse treatment. This system and method can efficiently inhibit and remove scale without adding chemicals.

[0004] To achieve the above objectives, the present invention discloses a segmented electrostatic coupling water treatment system suitable for circulating water reuse treatment, comprising an electrostatic water treatment chamber, a water conveyance pipeline, an ultrasonic generator, an electrocoagulation water treatment device, and a sedimentation tank;

[0005] The outlet of the electrostatic water treatment chamber is connected to the inlet of the electrocoagulation water treatment device via a water supply pipe. The outlet of the electrocoagulation water treatment device is connected to the inlet of the sedimentation tank. An ultrasonic transducer is installed on the water supply pipe, and the ultrasonic transducer is connected to an ultrasonic generator.

[0006] The electrostatic water treatment chamber includes an electrostatic reaction chamber and several ion rods disposed within the electrostatic reaction chamber. The upper end of each ion rod is provided with an ion rod connector, which is located above the water surface inside the electrostatic reaction chamber. The bottom side of the electrostatic water treatment chamber is provided with an electrostatic reaction chamber inlet, and the top side of the electrostatic water treatment chamber is connected to a water supply pipeline.

[0007] Each ion bar is fixed in the electrostatic water treatment chamber by a rigid partition.

[0008] The electrocoagulation water treatment device includes a DC power supply, an electrocoagulation chamber, and a distribution plate, several anode plates, and several cathode plates disposed within the electrocoagulation chamber. Each anode plate and each cathode plate is located above the distribution plate, and the cathode plates are staggered with the anode plates. The DC power supply is connected to each anode plate and each cathode plate. The water inlet on the bottom side of the electrocoagulation chamber is connected to a water supply pipe, and the water outlet on the top side of the electrocoagulation chamber is connected to a sedimentation tank.

[0009] Each cathode plate and each anode plate is fixed in the electrocoagulation chamber by a multi-porous partition.

[0010] The cathode plates and anode plates are distributed in parallel.

[0011] The bottom of the electrocoagulation chamber is provided with a first mud discharge port.

[0012] The settling device is provided with a baffle on its inner side, wherein the baffle is located below the inlet of the settling device, a second mud outlet is provided at the bottom of the settling device, and a settling device outlet is provided on the side of the top of the settling device.

[0013] The segmented electrochemical coupling water treatment method for circulating water reuse, as described in this invention, includes the following steps:

[0014] Wastewater enters the electrostatic water treatment chamber. Inside, scale-forming ions in the water are affected by the electrostatic field, and some are suspended in the water as aragonite-type soft scale microcrystals. The water discharged from the electrostatic water treatment chamber enters the electrocoagulation water treatment device through a water supply pipe. During this process, ultrasonic waves generated by an ultrasonic transducer perform ultrasonic cavitation treatment on the water in the water supply pipe. The resulting cavitation effect and high-speed turbulence enhance the calcium... 2+ The supersaturation and solute transfer rate create microjets and microacoustic flows, resulting in gradients and viscous stresses on the surface of pulsating bubbles. This inhibits the growth of pseudo-steady-state crystal embryos formed by scale-forming ions, causing the scale embryos to remain suspended in the water, thus reducing the Ca content in the solution. 2+ As the concentration decreases, the crystal particles are carried into the electrocoagulation water treatment device by the water flow;

[0015] In the electrocoagulation water treatment device, Al is generated during the electrolysis of the anode plate. 3+ or Fe 3+ Ions as electroactive flocculants, Al 3+ or Fe 3+ Ions cause a coagulation effect on suspended free crystal particles in the water. At the same time, hydrogen gas is released from the surface of the cathode plate, generating a flotation effect. The water discharged from the electrocoagulation water treatment device enters the settling tank for sedimentation, and the supernatant after sedimentation is discharged.

[0016] The present invention has the following beneficial effects:

[0017] The segmented electrostatic coupling water treatment system and method for circulating water reuse, as described in this invention, involves electrostatic treatment of the water in an electrostatic water treatment chamber. This ensures that the water undergoes ultrasonic treatment after a period of delayed electrostatic action. Following ultrasonic field treatment, the supersaturated solution absorbs the microscopic energy generated by ultrasonic cavitation, shortening the nucleation induction period of crystals, accelerating crystal formation, stabilizing the crystals in an aragonite morphology, and suspending them in the solution, thus preventing scale deposition and achieving scale prevention. The water then enters an electrocoagulation water treatment device for electrocoagulation, and finally undergoes sedimentation treatment to achieve highly efficient scale inhibition and removal without the addition of chemicals. It should be noted that the delayed electrostatic treatment process ensures that the ionic state in the water remains stable during ultrasonic treatment, greatly enhancing the cavitation effect of the ultrasound and further promoting the nucleation of numerous free scale microcrystals. Furthermore, through the synergistic treatment of electrostatics and ultrasonic cavitation at the front end, a large number of free microcrystals generated can be removed by electroflocculation in the middle and deep sedimentation at the end, achieving efficient reduction of water hardness and improving the practicality of the entire system. Finally, it should be noted that this invention adopts multiple green water treatment methods in synergistic coupling to efficiently remove scale-forming ions from water, achieving green and environmentally friendly requirements and providing technical support for chemical-free water treatment. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the present invention.

[0019] Among them, 1 is the inlet of the electrostatic reaction chamber, 2 is the ion rod, 3 is the rigid partition, 4 is the ion rod connector, 5 is the water supply pipe, 6 is the ultrasonic transducer, 7 is the ultrasonic generator, 8 is the electrocoagulation water treatment device, 9 is the diversion water distribution plate, 10 is the anode plate, 11 is the cathode plate, 12 is the multi-pore partition, 13 is the outlet of the electrocoagulation chamber, 14 is the first sludge discharge port, 15 is the DC power supply, 16 is the cable, 17 is the sedimentation tank, 18 is the baffle, 19 is the second sludge discharge port, and 20 is the sedimentation tank outlet. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion regarding the concepts disclosed in the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention.

[0021] The accompanying drawings show structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not drawn to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0022] refer to Figure 1 The segmented electrostatic coupling water treatment system for circulating water reuse according to the present invention includes an electrostatic water treatment chamber, a water conveying pipeline 5, an electrocoagulation water treatment device 8, and a sedimentation tank 17.

[0023] The outlet of the electrostatic water treatment chamber is connected to the inlet of the electrocoagulation water treatment device 8 via the water supply pipe 5, and the outlet of the electrocoagulation water treatment device 8 is connected to the inlet of the sedimentation tank 17.

[0024] In this embodiment, the electrostatic water treatment chamber includes an electrostatic reaction chamber and a plurality of ion rods 2 disposed in the electrostatic reaction chamber. Each ion rod 2 is fixed in the electrostatic reaction chamber by a rigid partition 3. An ion rod connector 4 is provided at the upper end of the ion rod 2. An electrostatic reaction chamber inlet 1 is provided on the side of the bottom of the electrostatic reaction chamber.

[0025] In this embodiment, an ultrasonic transducer 6 is installed on the water supply pipe 5, and the ultrasonic transducer 6 is connected to the ultrasonic generator 7.

[0026] In this embodiment, the electrocoagulation water treatment device 8 includes an electrocoagulation chamber and a distribution plate 9, a plurality of anode plates 10 and a plurality of cathode plates 11 disposed in the electrocoagulation chamber. Each anode plate 10 and each cathode plate 11 is located on the upper side of the distribution plate 9, and each cathode plate 11 and each anode plate 10 are staggered. Each cathode plate 11 and each anode plate 10 is fixed in the electrocoagulation chamber by a multi-gap partition 12, and each cathode plate 11 and each anode plate 10 is connected to a DC power supply 15 by a cable 16.

[0027] In this embodiment, the electrocoagulation chamber outlet 13 on the top side of the electrocoagulation chamber is connected to the sedimentation device 17.

[0028] In this embodiment, a first mud discharge port 14 is provided at the bottom of the electrocoagulation chamber.

[0029] In this embodiment, a baffle 18 is provided on the inner side of the settling device 17, wherein the baffle 18 is located below the inlet of the settling device 17, a second mud discharge port 19 is provided at the bottom of the settling device 17, and a settling device outlet 20 is provided on the side of the top of the settling device 17.

[0030] refer to Figure 1 The segmented electrochemical coupling water treatment method for circulating water reuse, as described in this invention, includes the following steps:

[0031] Wastewater enters the electrostatic reaction chamber through inlet 1. All ion rods 2 are fixed in a quincunx pattern within the chamber. Rigid baffles 3 are installed at the ion rod joints 4 at the upper ends of the ion rods 2. The ion rod joints 4 are located above the water surface within the chamber. After the water to be treated enters the chamber, scale-forming ions are partially suspended in the water as aragonite-type soft scale microcrystals due to the electrostatic field. The water discharged from the electrostatic reaction chamber enters the electrocoagulation chamber via water supply pipe 5. During this process, several ultrasonic transducers 6 are arranged circumferentially and axially on the outer wall of water supply pipe 5. The ultrasonic waves generated by the transducers 6 perform ultrasonic cavitation treatment on the water within the pipe 5. The resulting cavitation effect and high-speed turbulence greatly enhance the calcium content of the calcium ions. 2+ The supersaturation and solute transfer rate of the microjet and microacoustic flow can create a high velocity gradient and viscous stress on the surface of pulsating bubbles, which hinders the growth of pseudo-steady-state crystal embryos formed by scale-forming ions. The growth of the crystal embryos cannot exceed the critical scale and cannot generate a stable growth source. The scale crystal embryos remain suspended in the water, causing the Ca in the solution to be... 2+ As the concentration rapidly decreases, a large number of crystal particles enter the flocculation reaction chamber with the water flow.

[0032] Within the electrocoagulation chamber, due to the ultrasonic action of the static electrodes, a large number of free suspended scale microcrystals and crystal embryos in the water are removed. After passing through the lower inlet of the electrocoagulation chamber, the water enters the electrocoagulation chamber via the distribution plate 9. The anode plate 10 is made of Al / Fe material, and the cathode plate 11 is made of stainless steel. Each cathode plate 11 is parallel to each anode plate 10. Voltage / current is applied through the DC power supply 15, and the Al produced during the electrolysis of the anode plate 10... 3+ or Fe 3+ Ions as electroactive flocculants, Al 3+ or Fe 3+ Ions can cause a coagulation effect on suspended free crystal particles in water. At the same time, a large amount of hydrogen gas is released on the surface of the cathode plate 11, generating an air flotation effect and improving the efficiency of flocculation and sedimentation. The air flotation is slowed down by the porous baffle 12, and the water in the electrocoagulation chamber enters the settling tank 17 through the electrocoagulation chamber outlet 13. Some of the complexed flocs settle and are discharged from the electrocoagulation chamber through the first sludge discharge outlet 14.

[0033] The water settles in the settling tank 17. The settling ratio can be increased by the baffle 18. The settled sludge is discharged through the second sludge discharge port 19. The supernatant of the settling tank 17 is discharged through the settling tank outlet 20 and reused.

[0034] It should be noted that the electrostatic water treatment device acts on the water body through an electrostatic field. Studies have shown that applying an electrostatic field can greatly reduce the formation of calcite-type scale and increase the formation rate of aragonite-type scale. When ultrasonic treatment is applied, according to the cavitation theory of ultrasound, stable cavitation and micro-acoustic flow can provide a dissolution mechanism on the wall surface. This stress has a great destructive effect on the growth of pseudo-steady-state crystal embryos during the induction period of scale formation.

[0035] In the case of calcium carbonate scale, after the scale-forming ions reach saturation on the wall surface, they undergo nucleation. However, not all nucleation centers appear on the wall surface; a considerable number of submicroscopic particles become nucleation centers close to the wall surface, causing subsequent crystallization to occur both on the wall surface and in the fluid adjacent to the wall. Moreover, when the supersaturation is sufficiently high, newly diffused ions preferentially nucleate on the surface and on submicroscopic particles, then form crystals. The crystal nuclei and microcrystals formed on the submicroscopic particles exist in a dispersed and free state in the solution adjacent to the wall surface. Some are removed by the turbulent flow of the solution, while others await embedding into the scale layer. When the solution is subjected to ultrasonic treatment, the vibration has a nonlinear effect as it propagates in the medium. This nonlinear vibration induces forces such as DC directional force and radiation force, which to some extent have the same effect as the shear force caused by turbulence. At the same time, the microjets generated by ultrasonic cavitation can also remove or weaken the boundary contaminant layer, increase the stirring effect, and increase the probability of free crystals waiting to be embedded in the scale layer. The unique cavitation effect of ultrasound can be used to prolong the induction period of calcium carbonate crystal precipitation.

[0036] Studies have shown that ultrasonic cavitation is enhanced in an electrostatic field. The water treatment system and method described in this invention are an application of this research. The electrostatic treatment of the water at the front end ensures that the water enters the ultrasonic treatment after a delayed electrostatic effect. After ultrasonic field treatment, the supersaturated solution absorbs the microscopic energy generated by ultrasonic cavitation, shortening the nucleation induction period of crystals, accelerating the formation of crystal nuclei, stabilizing the crystals in the aragonite morphology, suspending them in the solution, making them less prone to deposition, and achieving the purpose of scale prevention.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A segmented electrochemically coupled water treatment system suitable for circulating water reuse, characterized in that, It includes an electrostatic water treatment chamber, a water supply pipeline (5), an ultrasonic generator (7), an electrocoagulation water treatment device (8), and a sedimentation tank (17). The outlet of the electrostatic water treatment chamber is connected to the inlet of the electrocoagulation water treatment device (8) via a water supply pipe (5). The outlet of the electrocoagulation water treatment device (8) is connected to the inlet of the sedimentation tank (17). An ultrasonic transducer (6) is installed on the water supply pipe (5), and the ultrasonic transducer (6) is connected to the ultrasonic generator (7). The electrostatic water treatment chamber includes an electrostatic reaction chamber and a plurality of ion rods (2) disposed in the electrostatic reaction chamber. The upper end of the ion rods (2) is provided with an ion rod connector (4), which is located above the water surface in the electrostatic reaction chamber. The side of the bottom of the electrostatic water treatment chamber is provided with an electrostatic reaction chamber inlet (1), and the electrostatic water treatment chamber outlet on the top side of the electrostatic water treatment chamber is connected to the water supply pipe (5). Each ion rod (2) is fixed in the electrostatic water treatment chamber by a rigid partition (3); The electrocoagulation water treatment device (8) includes a DC power supply (15), an electrocoagulation chamber, a distribution plate (9), several anode plates (10) and several cathode plates (11) disposed in the electrocoagulation chamber. Each anode plate (10) and each cathode plate (11) is located on the upper side of the distribution plate (9), and each cathode plate (11) and each anode plate (10) are staggered. The DC power supply (15) is connected to each anode plate (10) and each cathode plate (11). The water inlet on the bottom side of the electrocoagulation chamber is connected to the water supply pipe, and the water outlet (13) on the top side of the electrocoagulation chamber is connected to the sedimentation device (17). Each cathode plate (11) and each anode plate (10) are fixed in the electrocoagulation chamber by a multi-porous partition (12).

2. The segmented electrochemical coupling water treatment system for circulating water reuse as described in claim 1, characterized in that, Each cathode plate (11) and each anode plate (10) are distributed in parallel.

3. The segmented electrochemical coupling water treatment system for circulating water reuse as described in claim 1, characterized in that, The bottom of the electrocoagulation chamber is provided with a first mud discharge port (14).

4. The segmented electrochemical coupling water treatment system for circulating water reuse as described in claim 1, characterized in that, The settling device (17) is provided with a baffle (18) on its inner side, wherein the baffle (18) is located below the inlet of the settling device (17), the bottom of the settling device (17) is provided with a second mud outlet (19), and the settling device outlet (20) is provided on the side of the top of the settling device (17).

5. A segmented electrochemical coupling water treatment method suitable for circulating water reuse, characterized in that, The segmented electro-coupled water treatment system for circulating water reuse as described in claim 1 includes the following steps: Wastewater enters the electrostatic water treatment chamber. In this chamber, scale-forming ions are affected by electrostatic forces, and some ions suspend in the water as aragonite-type soft scale microcrystals. The water discharged from the electrostatic water treatment chamber enters the electrocoagulation water treatment device (8) via the water supply pipe (5). During this process, ultrasonic waves generated by the ultrasonic transducer (6) perform ultrasonic cavitation treatment on the water in the water supply pipe (5). The resulting cavitation effect and high-speed turbulence enhance the Ca2+ flow. 2+ The supersaturation and solute transfer rate create microjets and microacoustic flows, resulting in gradients and viscous stresses on the surface of pulsating bubbles. This inhibits the growth of pseudo-steady-state crystal embryos formed by scale-forming ions, causing the scale embryos to remain suspended in the water, thus reducing the Ca content in the solution. 2+ As the concentration decreases, the crystal particles enter the electrocoagulation water treatment device (8) with the water flow. In the electrocoagulation water treatment device (8), Al generated during the electrolysis of the anode plate (10) 3+ or Fe 3+ Ions as electroactive flocculants, Al 3+ or Fe 3+ Ions cause a coagulation effect on suspended free crystal particles in the water. At the same time, hydrogen gas is released from the surface of the cathode plate (11), generating a flotation effect. The water discharged from the electrocoagulation water treatment device (8) enters the sedimentation tank (17) for sedimentation, and the supernatant after sedimentation is discharged.

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