Electrodeionization equipment for wastewater

Abstract

The utility model discloses waste water electro-desalting equipment, which belongs to the technical field of waste water treatment, and comprises a cooling tower and a cooling water tank arranged at the bottom of the cooling tower, the input end of the cooling tower is communicated and connected with a circulating water main pipe, the circulating water main pipe is communicated and connected with a circulating water branch pipe, and the circulating water branch pipe is communicated and connected with a circulating water outlet pipe. The output end of the circulating water branch pipe is connected with an electrochemical water treatment device, a large number of scale inhibition small molecules can be generated in the electrolysis process, a very good scale inhibition effect can be achieved, a dense ferroferric oxide (Fe3O4) protection film can be generated on the surfaces of a system pipeline and the pipe wall of heat exchange equipment by using an electrochemical technology for a long time in a circulating water system, and the service life of the circulating water system is prolonged. The corrosion rate of carbon steel equipment is less than or equal to 0.075; and when the electrochemical water treatment device continuously operates, a circulating water system can safely and stably operate in an energy-saving and zero-pollution manner for a long time.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, and more specifically, to a wastewater electro - desalination device. Background Technique

[0002] High - salt wastewater refers to wastewater with a total salt content of at least 3.5 wt%. It mainly comes from chemical plants and the collection and processing of oil and natural gas, etc. This kind of wastewater contains various substances (including salts, oils, organic heavy metals, and radioactive substances). The generation channels of saline wastewater are extensive, and the water volume is increasing year by year. Removing the organic pollutants in saline sewage is crucial for the impact on the environment.

[0003] At present, most wastewater desalination devices use reverse osmosis membranes or sub - audio frequency technology devices. When using the sub - audio frequency technology to remove scale, the following conditions need to be met: the sum of calcium hardness and alkali hardness is less than 1100 mg / l (calculated as calcium carbonate), and a large amount of acid and scale inhibitors need to be added to the circulating water, which is uneconomical. The usage conditions are relatively harsh, which is disadvantageous to the user, so the sub - audio frequency technology is not considered. Using the reverse osmosis membrane treatment method, the treatment cost is high, and a large amount of membrane concentrate is generated, which poses a great challenge to enterprises with zero - discharge of wastewater. Therefore, we propose a wastewater electro - desalination device to solve the above - mentioned existing problems. Content of the Utility Model

[0004] 1. Technical Problem to be Solved

[0005] Aiming at the problems existing in the prior art, the purpose of the utility model is to provide a wastewater electro - desalination device, which can generate a large number of scale - inhibiting small molecules during the electrolysis process, and can achieve a very good scale - inhibiting effect. Long - term use of the electrochemical technology in the circulating water system can form a dense protective film of magnetite (Fe3O4) on the surface of the system pipeline and the tube wall of the heat exchange equipment, playing a good role in system anti - corrosion (the corrosion rate of carbon steel equipment ≤ 0.075; the corrosion rate of alloy and stainless steel equipment ≤ 0.005). When the electrochemical water treatment device operates continuously, the circulating water system can operate safely, stably, energy - savingly, and pollution - free for a long time.

[0006] 2. Technical Solution

[0007] To solve the above problems, the utility model adopts the following technical solutions.

[0008] A wastewater electro - desalination device includes a cooling tower and a cooling water pool installed at the bottom of the cooling tower, and the input end of the cooling tower is conductively connected to a circulating water main pipe;

[0009] A circulating water branch pipe is conductively connected to the main circulating water pipe. The output end of the circulating water branch pipe is connected to an electrochemical water treatment device. A main valve for the branch pipe is installed at one end of the circulating water branch pipe close to the main circulating water pipe. An electromagnetic flowmeter and a water inlet electric valve are successively installed on the side of the main valve for the branch pipe away from the main circulating water pipe;

[0010] A flowing water pipe is conductively connected between the output end of the electrochemical water treatment device and the cooling water pool;

[0011] A sewage discharge pipe is conductively connected to the bottom end of the electrochemical water treatment device, and a sewage discharge electric valve is installed at the sewage discharge pipe;

[0012] The output end of the sewage discharge pipe is connected to a dirt sedimentation tank.

[0013] Further, a backwashing pipe is conductively connected between the backwashing interface of the electrochemical water treatment device and the circulating water branch pipe, and a backwashing electric valve is installed at the backwashing pipe.

[0014] Further, the water inlet electric valve is located at the part where the backwashing pipe and the circulating water branch pipe are combined and close to the electrochemical water treatment device.

[0015] Further, the electromagnetic flowmeter is located at the part where the backwashing pipe and the circulating water branch pipe are combined and away from the electrochemical water treatment device.

[0016] Further, a supernatant reuse pipe and a dirt discharge pipe are successively conductively connected from top to bottom on the side of the dirt sedimentation tank away from the sewage discharge pipe.

[0017] Further, the output end of the sewage discharge pipe is located above the dirt discharge pipe.

[0018] Further, stop valves are installed at both the supernatant reuse pipe and the dirt discharge pipe.

[0019] 3. Beneficial effects

[0020] Compared with the prior art, the advantages of the present utility model are as follows:

[0021] (1) In this solution, the treated water quality is better than the current national standard of circulating water "GB / T50050 - 2017". At the same time, a large number of scale - inhibiting small molecules will be generated during the electrolysis process, which can achieve a very good scale - inhibiting effect. Long - term use of the electrochemical technology in the circulating water system can form a dense protective film of magnetite (Fe3O4) on the surfaces of the system pipes and the tube walls of heat exchange equipment, playing a good role in system anti - corrosion (corrosion rate of carbon steel equipment ≤ 0.075; corrosion rate of alloy and stainless steel equipment ≤ 0.005). When the electrochemical water treatment device operates continuously, the circulating water system can operate safely, stably, energy - savingly and with zero pollution for a long time.

[0022] (2) In this solution, by opening the backwashing electric valve, circulating water enters the inside of the backwashing pipe to clean the floccules adhering to the inner components of the electrochemical water treatment device, which is very convenient for cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0024] Figure 2 is a schematic diagram of the circulating water flow direction of the present utility model;

[0025] Figure 3 is a schematic diagram of the electrochemical water treatment device and pipeline connection of the present utility model;

[0026] Figure 4 is a schematic diagram of the connection between the cooling tower and the cooling water pool of the present utility model and the pipeline.

[0027] Description of the reference numerals in the drawings:

[0028] 1. Cooling tower; 2. Cooling water pool; 3. Main circulating water pipe; 4. Branch circulating water pipe; 5. Electrochemical water treatment device; 6. Backwashing pipe; 7. Branch main valve; 8. Electromagnetic flowmeter; 9. Inlet electric valve; 10. Backwashing electric valve; 11. Self-flow water pipe; 12. Drain pipe; 13. Dirt sedimentation tank; 14. Drainage electric valve; 15. Supernatant reuse pipe; 16. Dirt discharge pipe. SPECIFIC EMBODIMENTS

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model; obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] Embodiment:

[0031] Please refer to Figures 1-4 , a wastewater electro-deionization device, including a cooling tower 1 and a cooling water pool 2 installed at the bottom of the cooling tower 1. The input end of the cooling tower 1 is conductively connected to a main circulating water pipe 3;

[0032] A branch circulating water pipe 4 is conductively connected to the main circulating water pipe 3. The output end of the branch circulating water pipe 4 is connected to an electrochemical water treatment device 5. A branch main valve 7 is installed at one end of the branch circulating water pipe 4 close to the main circulating water pipe 3. An electromagnetic flowmeter 8 and an inlet electric valve 9 are sequentially installed on the side of the branch main valve 7 away from the main circulating water pipe 3;

[0033] A flowing water pipe 11 is conductively connected between the output end of the electro-chemical water treatment device 5 and the cooling water pool 2;

[0034] The bottom end of the electro-chemical water treatment device 5 is conductively connected to a sewage pipe 12, and a sewage electric valve 14 is installed at the sewage pipe 12;

[0035] The output end of the sewage pipe 12 is connected to a dirt sedimentation tank 13;

[0036] It should be noted that when the waste water desalination equipment is in use, the main valve 7 of the branch pipe and the inlet water electric valve 9 are opened. The circulating cooling water enters the electro-chemical water treatment device 5 in the form of a bypass through the circulating water branch pipe 4, and the flow rate of the circulating cooling water is calculated by the electromagnetic flowmeter 8. After the circulating water is fully electrolyzed by the electro-chemical water treatment device 5, calcium and magnesium salts in the circulating water can be directly adsorbed in solid form, and pollutants such as bacteria, algae, suspended matter, and biological slime in the water are directly catalytically oxidized and inactivated by strong oxidizing substances such as light free radicals [·OH], oxygen free radicals [·O], chlorine gas, ozone, H202, and hypochlorous acid, so that they completely lose their activity and have no suspension and adhesion ability. Finally, a flocculent sediment is formed and discharged into the dirt sedimentation tank 13 through the sewage pipe 12 by opening the sewage electric valve 14, discharging harmful substances such as COD, NH3-N, and chloride ions in the circulating water system. After electrolysis, good removal effects can also be obtained. The treated circulating water enters the cooling water pool 2 through the flowing water pipe 11. The treated water quality is better than the current national standard of circulating water "GB / T50050-2017". At the same time, a large number of scale-inhibiting small molecules will be generated during the electrolysis process, which can achieve a very good scale-inhibiting effect. Long-term use of the electro-chemical technology in the circulating water system can form a dense protective film of magnetite (Fe3O4) on the surface of the system pipeline and the heat exchange equipment pipe wall, playing a good role in system anti-corrosion (corrosion rate of carbon steel equipment ≤0.075; corrosion rate of alloy and stainless steel equipment ≤0.005). When the electro-chemical device operates continuously, the circulating water system can operate safely, stably, energy-savingly, and pollution-free for a long time.

[0037] As Figure 1 、 Figure 2 As shown, a backwash pipe 6 is conductively connected between the backwash interface of the electro-chemical water treatment device 5 and the circulating water branch pipe 4, and a backwash electric valve 10 is installed at the backwash pipe 6;

[0038] It should be noted that by opening the backwash electric valve 10, the circulating water enters the inside of the backwash pipe 6, and the flocs adhering to the inner components of the electro-chemical water treatment device 5 are cleaned, which is very convenient.

[0039] As Figure 1 、 Figure 2As shown in the figure, the inlet electric valve 9 is located at the part where the backwash pipe 6 combines with the circulating water branch pipe 4 and is close to the electrochemical water treatment device 5, and the electromagnetic flowmeter 8 is located at the part where the backwash pipe 6 combines with the circulating water branch pipe 4 and is far from the electrochemical water treatment device 5.

[0040] It should be noted that when the main valve 7 of the branch pipe and the inlet electric valve 9 are opened, the circulating cooling water enters the electrochemical water treatment device 5 in the form of a bypass through the circulating water branch pipe 4, and the flow rate of the circulating cooling water is calculated by the electromagnetic flowmeter 8. The circulating water is fully electrolyzed by the electrochemical water treatment device 5.

[0041] As Figure 2 shown, on the side of the dirt sedimentation tank 13 far from the sewage discharge pipe 12, a supernatant reuse pipe 15 and a dirt discharge pipe 16 are connected in series from top to bottom. The output end of the sewage discharge pipe 12 is located above the dirt discharge pipe 16. Stop valves are installed at both the supernatant reuse pipe 15 and the dirt discharge pipe 16;

[0042] It should be noted that the finally formed flocculent sediment is discharged into the dirt sedimentation tank 13 through the sewage discharge pipe 12 by opening the sewage discharge electric valve 14, discharging harmful substances such as COD, NH3-N, and chloride ions in the circulating water of the circulating water system. After electrolysis, good removal effects can also be obtained. The solid sediment is discharged through the dirt discharge pipe 16, and the supernatant in the dirt sedimentation tank 13 is recycled through the supernatant reuse pipe 15.

[0043] During use: Open the main valve 7 of the branch pipe and the inlet electric valve 9. The circulating cooling water enters the electrochemical water treatment device 5 in the form of a bypass through the circulating water branch pipe 4, and the flow rate of the circulating cooling water is calculated by the electromagnetic flowmeter 8. After the circulating water is fully electrolyzed by the electrochemical water treatment device 5, calcium and magnesium salts in the circulating water can be directly adsorbed in solid form, and pollutants such as bacteria, algae, suspended solids, and biological slime in the water are directly catalytically oxidized and inactivated by strong oxidizing substances such as light free radicals [·OH], oxygen free radicals [·O], chlorine gas, ozone, H2O2, and hypochlorous acid, so that they completely lose their activity and have no suspension and adhesion ability. Finally, the formed flocculent sediment is discharged into the dirt sedimentation tank 13 through the sewage discharge pipe 12 by opening the sewage discharge electric valve 14, discharging harmful substances such as COD, NH3-N, and chloride ions in the circulating water of the circulating water system. After electrolysis, good removal effects can also be obtained. The treated circulating water enters the cooling water tank 2 through the self-flow water pipe 11.

[0044] The above is only a preferred specific embodiment of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and its improved concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. An electro - desalination device for wastewater, comprising a cooling tower (1) and a cooling water tank (2) installed at the bottom of the cooling tower (1), characterized in that: The input end of the cooling tower (1) is conductively connected to the main circulating water pipe (3); A circulating water branch pipe (4) is conductively connected to the main circulating water pipe (3). The output end of the circulating water branch pipe (4) is connected to an electrochemical water treatment device (5). A main branch valve (7) is installed at one end of the circulating water branch pipe (4) close to the main circulating water pipe (3). An electromagnetic flowmeter (8) and a water inlet electric valve (9) are sequentially installed on the side of the main branch valve (7) away from the main circulating water pipe (3); A flowing water pipe (11) is conductively connected between the output end of the electrochemical water treatment device (5) and the cooling water tank (2); A sewage discharge pipe (12) is conductively connected to the bottom end of the electrochemical water treatment device (5). A sewage discharge electric valve (14) is installed at the sewage discharge pipe (12); The output end of the sewage discharge pipe (12) is connected to a dirt sedimentation tank (13).

2. An electro - desalination device for wastewater according to claim 1, characterized in that: A backwash pipe (6) is conductively connected between the backwash interface of the electrochemical water treatment device (5) and the circulating water branch pipe (4). A backwash electric valve (10) is installed at the backwash pipe (6).

3. The electro - desalination equipment for wastewater according to claim 2, characterized in that: The water inlet electric valve (9) is located at the part where the backwash pipe (6) and the circulating water branch pipe (4) are combined and close to the electrochemical water treatment device (5).

4. The electro - desalination equipment for wastewater according to claim 2, characterized in that: The electromagnetic flowmeter (8) is located at the part where the backwash pipe (6) and the circulating water branch pipe (4) are combined and away from the electrochemical water treatment device (5).

5. The electro - desalination equipment for wastewater according to claim 1, characterized in that: A supernatant reuse pipe (15) and a dirt discharge pipe (16) are sequentially conductively connected from top to bottom on the side of the dirt sedimentation tank (13) away from the sewage discharge pipe (12).

6. The electro - desalination equipment for wastewater according to claim 5, characterized in that: The output end of the sewage discharge pipe (12) is located above the dirt discharge pipe (16).

7. An electro - desalination device for wastewater according to claim 5, characterized in that: Stop valves are installed at both the supernatant reuse pipe (15) and the dirt discharge pipe (16).

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