Low-voltage electrolysis device for sewage treatment

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a low-voltage electrolysis device for sewage treatment, which comprises an electrolytic bath, a working electrode is arranged in the electrolytic bath, a deflection baffle is mounted on the working electrode, a metal bottom plate is arranged at the lower part of the electrolytic bath, and a cathode and an anode of the working electrode are connected with the metal bottom plate. An injection pump is arranged at the bottom of the electrolytic cell, an air inlet and an air outlet are formed in the electrolytic cell, the water inlet end of the injection pump is externally connected with clear water through a clear water pipe, a water inlet and a water outlet are formed in the clear water pipe, the water outlet end of the clear water pipe is arranged at the bottom of a working electrode in a sleeving manner, and a direct-current stabilized power supply is connected to the working electrode. Therefore, the low-voltage electrolysis device for sewage treatment can solve the technical problems of high cost and high energy consumption of an electrochemical oxidation method.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, more specifically, it relates to a low-voltage electrolytic device for sewage treatment. BACKGROUND

[0002] With the rapid development of modern industry, the problem of wastewater discharge is becoming increasingly serious, especially the wastewater containing refractory organic matter and ammonia nitrogen, which poses a great threat to the water environment. If these wastewaters are directly discharged without proper treatment, it will lead to eutrophication of water body, rapid deterioration of water quality, and further serious damage to the ecological balance, affecting the living environment of human beings and other organisms. Therefore, it is particularly important to develop efficient, economical and environmentally friendly wastewater treatment technology.

[0003] As an advanced wastewater treatment technology, electrochemical oxidation method has shown broad application prospects in the field of refractory wastewater treatment due to its high efficiency, high selectivity, simple operation and environmental friendliness. Through electrochemical reaction, this technology can effectively degrade organic matter in wastewater and convert ammonia nitrogen into harmless substances, thereby achieving wastewater purification. However, despite the many advantages of electrochemical oxidation method, its high energy consumption and high cost remain the main bottleneck restricting its widespread application in practical application. How to further optimize electrochemical oxidation technology, improve treatment efficiency and reduce operating cost is a key technical problem to be solved in the current wastewater treatment field. CONTENT OF THE INVENTION

[0004] Based on the above problems, the present application provides a low-voltage electrolytic device for sewage treatment to solve the technical problems of high cost and high energy consumption of electrochemical oxidation method.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is:

[0006] A low-voltage electrolytic device for sewage treatment, comprising an electrolytic cell, a working electrode is arranged in the electrolytic cell, a baffle is installed on the working electrode, a metal bottom plate is arranged at the lower part of the electrolytic cell, the cathode and anode of the working electrode are connected with the metal bottom plate, a jet pump is arranged at the bottom of the electrolytic cell, an air inlet and an air outlet are arranged on the electrolytic cell, a clean water pipe is connected to clean water through the water inlet and outlet of the clean water pipe, the clean water pipe is sleeved on the bottom of the working electrode, and a direct current stabilized power supply is connected to the working electrode.

[0007] A branch pipeline is arranged between the clean water pipe and the jet pump, a hand valve is arranged on the branch pipeline, and a valve is arranged on the clean water pipe.

[0008] In one specific embodiment, the device is composed of five groups of electrolytic cells, each of which is connected in sequence through pipelines, and the water outlet is sleeved on the working electrode.

[0009] The positive effects of the utility model are as follows:

[0010] Low-voltage electrolysis design: The device adopts low-voltage electrolysis technology, which can significantly reduce energy consumption compared with traditional high-voltage electrolysis. By optimizing the structure and working conditions of the electrolytic cell, efficient electrochemical oxidation reaction can be achieved at a lower voltage, thereby reducing power consumption.

[0011] Combination of baffle and working electrode: The baffle is installed on the working electrode in the electrolytic cell, which can optimize the path of wastewater flowing through the electrode, increase the contact area and time of wastewater and the electrode, and improve the electrochemical oxidation efficiency. When the baffle is washed, it will be ejected due to the high water pressure. The baffle allows the water flow back to the electrolytic cell, and the baffle also plays a stirring role, promoting the uniform distribution of substances in the wastewater, and further improving the treatment effect.

[0012] Connection of metal base plate and working electrode: The positive and negative levels of the working electrode are connected with the metal base plate, which ensures the effective transmission of current and reduces energy loss. This design not only improves the electrolysis efficiency, but also reduces the equipment cost. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creative labor.

[0014] Figure 1 It is a structural schematic view of the utility model;

[0015] Figure 2 It is a structural schematic view of the electrolytic cell of the utility model;

[0016] Figure 3 It is a top view of the structure of the utility model;

[0017] Figure 4 It is Figure 2 the sectional view of A-A of

[0018] Figure 5 It is Figure 2 the sectional view of B-B of

[0019] Figure 6 It is a partial structure enlarged view of the structure of the utility model;

[0020] Explanation of reference numerals in the attached figures

[0021] 1. Electrolytic cell; 2. Working electrode; 3. Baffle plate; 4. Metal base plate; 5. Jet pump; 6. Water inlet; 7. Water outlet; 8. DC regulated power supply; 9. Air outlet; 10. Air inlet; 11. Alkali washing tower; 12. Sprayer; 13. Ammonia absorption tower; 14. Exhaust fan; 15. Dosing tank; 16. Agitator; 17. Equalization tank; 18. Aeration tank; 19. Blower; 20. Circulation pump; 21. Branch pipeline; 22. Manual valve; 23. Valve. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Example

[0024] like Figures 1-6 As shown, a low-pressure electrolysis device for wastewater treatment includes an electrolytic cell 1, a working electrode 2 disposed inside the electrolytic cell 1, a baffle 3 mounted on the working electrode 2, a metal base plate 4 disposed at the lower part of the electrolytic cell 1, the anode and cathode of the working electrode 2 connected to the metal base plate 4, a jet pump 5 disposed at the bottom of the electrolytic cell 1, an air inlet 10 and an air outlet 9 disposed on the electrolytic cell 1, and a water inlet 6 and an outlet 7 disposed on the clean water pipe. The device consists of five sets of electrolytic cells 1, which are connected sequentially by pipelines. The air outlet 9 of the later set of electrolytic cells 1 is connected to the air inlet 10 of the earlier set of electrolytic cells 1. Five sets of electrolytic cells 1 are connected sequentially through pipelines to form a series structure. Wastewater from each set of electrolytic cells overflows into the next set of electrolytic cells, allowing for gradual wastewater treatment and improving treatment efficiency. The outlet 7 is fitted onto the working electrode 2. The air outlet 9 of the next set of electrolytic cells 1 is connected to the air inlet 10 of the previous set of electrolytic cells 1, ensuring continuous wastewater treatment and effective gas discharge. Two nozzles are installed on the outlet 7; one nozzle sprays water upwards onto the working electrode, and the other sprays water downwards, ensuring that both nozzles completely cover the surface of the working electrode when operating.

[0025] The water inlet end of the jet pump 5 is externally connected with a clean water pipe, the water outlet end of the clean water pipe is sleeved on the bottom of the working electrode 2, the working electrode 2 is connected with a direct current stabilized power supply 8, a branch pipeline 21 is arranged between the clean water pipe and the jet pump 5, a hand valve 22 is arranged on the branch pipeline 21, and a valve 23 is arranged on the clean water pipe.

[0026] When the efficiency of the working electrode 2 is reduced, the valve 23 is opened and the hand valve 22 is closed to flush the working electrode 2, the power of the jet pump 5 is increased, and the clean water is sprayed out at a very high speed at the outlet end, so that the impurities are washed down. When flushing is not required, the hand valve 22 is opened and the valve 23 is closed to realize internal circulation of the sewage, and at the same time, the power of the jet pump 5 is reduced, so that the sewage can flow at a very low speed to contact the working electrode 2 and react. If the flow rate is too large, the reaction is not perfect. The sewage in the electrolytic cell 1 is disturbed, and the sewage in the electrolytic cell 1 is also stirred.

[0027] The last group of the electrolytic cell 1 is connected with an alkali washing tower 11, the alkali washing tower 11 is internally provided with a spray 12, the alkali washing tower 11 is connected with an ammonia absorption tower 13, and the air outlet 9 of the ammonia absorption tower 13 is connected with an induced draft fan 14. The air outlet 9 of the last group of electrolytic cells 1 is connected with the alkali washing tower 11, which can remove harmful gases generated in the electrolysis process, such as acidic gases, and protect the environment.

[0028] The ammonia absorption tower 13 connected with the alkali washing tower 11 can further absorb and treat harmful gases such as ammonia gas that may be contained, improving the quality of the discharged gas.

[0029] The baffle 3 installed on the working electrode 2 in the electrolytic cell 1 can optimize the path of the wastewater flowing through the electrode, increase the contact area and time of the wastewater with the working electrode 2, and improve the efficiency of electrochemical oxidation. When flushing, the baffle 3 will be sprayed out due to the large water pressure. The baffle 3 allows the water to flow back into the electrolytic cell 1, and at the same time, the baffle 3 also plays a stirring role, promoting the uniform distribution of substances in the wastewater, further improving the treatment effect. At the same time, in order to prevent the working electrode 2 from being corroded and contaminated by pollutants, a jet pump 5 is specially arranged in the electrolytic cell 1 to blow off the electrode, preventing it from being affected by the attached pollutants.

[0030] The frontmost electrolytic cell 1 is connected with a dosing system, the dosing system comprises a dosing barrel 15, the dosing barrel 15 is internally provided with a stirrer 16, the lower portion of the dosing barrel 15 is provided with an adjusting tank 17, one side of the adjusting tank 17 is provided with an aeration tank 18, and the aeration tank 18 communicates with the adjusting tank 17.

[0031] The aeration tank 18 is connected with a blower 19, and a pH sensor and a temperature control sensor are arranged in the aeration tank 18; the dosing barrel 15 is connected with the aeration tank 18 and the adjusting tank 17 through pipelines respectively, and a circulating pump 20 is arranged on the pipelines between the dosing barrel 15 and the aeration tank 18 and between the dosing barrel 15 and the adjusting tank 17.

[0032] The dosing system can accurately control the amount and type of the medicament added into the sewage through the dosing barrel 15 and the stirrer 16, which helps to adjust the chemical properties of the sewage and improve the electrolysis effect.

[0033] The cooperation of the adjusting tank 17 and the aeration tank 18 can further adjust the pH value and temperature of the sewage, so as to provide suitable conditions for the electrolysis process.

[0034] The aeration tank 18 is used to blow off the ammonia nitrogen in the sewage after the pH of the sewage is adjusted to be alkaline, and the ammonia gas after the blow-off enters the ammonia absorption tower 13.

[0035] The arrangement of the pH sensor and the temperature control sensor can realize real-time monitoring of the environmental conditions in the aeration tank 18, so as to ensure the stability and controllability of the sewage treatment process.

[0036] The circulating pump 20 arranged on the pipelines between the dosing barrel 15 and the aeration tank 18 and between the dosing barrel 15 and the adjusting tank 17 can ensure the uniform distribution of the medicament and the sufficient mixing of the sewage, so as to improve the treatment effect. The device realizes the low-energy-consumption electrolysis method to reduce the ammonia nitrogen in the sewage. The cathode and anode of the working electrode 2 are connected with the metal bottom plate 4 placed at the bottom of the electrolytic tank 1. In this operation, the electric current passes through the metal bottom plate 4 and the electrolyte at the same time. In the whole electrolysis system, the resistance mainly depends on the resistance of the metal bottom plate 4, so as to achieve the purpose of increasing the electric current and reducing the voltage of the electrolysis reaction. From the perspective of environmental protection and energy saving, the use of high voltage usually accompanies high energy consumption, which is not conducive to environmental friendliness. However, the low voltage and high current of the device change the traditional electrolysis method and realize energy saving and environmental protection.

[0037] In the test stage of the device, the cathode and anode of the working electrode 2 are connected with the metal bottom plate 4 to maintain the stability of the device operation when the amount of sewage is 40L and the electrolysis reaction is operated. In the implementation, the material of the bottom plate is selected to be a material susceptible to corrosion, the voltage is 4.87V, the current is 5.01A, the current density is 1000mA / cm2, the initial adjusted pH is 9, and the electrolysis time is set to 5 hours for pretreatment. The industrial biochemical adjusting tank 17 wastewater is taken, the ammonia nitrogen in the original wastewater is 7032 mg / L, and the ammonia nitrogen after the pretreatment by the device is 922 mg / L, and the degradation rate of the ammonia nitrogen is 86.9%.

[0038] In the test phase, the device is operated by connecting the working electrode 2 anode and cathode to the metal base plate 4 when the sewage volume is 40L, the electrolysis reaction is operated, to maintain the stability of the device operation. In the implementation, the base plate material is selected from corrosion-resistant materials, the voltage is 5.24V, the current is 5.00A, the current density is 1100mA / cm2, the initial adjustment pH is 9, and the electrolysis time is set to 5 hours for pretreatment. Take the industrial biochemical conditioning tank 17 wastewater, the original wastewater ammonia nitrogen is 5811 mg / L, COD is 8397 mg / L, after the pretreatment of the equipment, the ammonia nitrogen is 1448 mg / L, the COD is 1315 mg / L, the degradation rate of ammonia nitrogen is 75.08%, and the degradation rate of COD is 84.34%.

[0039] Finally, it should be noted that in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0040] The above description of disclosed embodiments allows a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low voltage electrolytic device for sewage treatment, characterized in that, The utility model provides an electrolytic tank (1) is provided with working electrode (2) in, working electrode (2) is installed on the baffle (3) of deflection, the lower part of electrolytic tank (1) is provided with metal bottom plate (4), the cathode and anode of working electrode (2) are connected with metal bottom plate (4), the bottom of electrolytic tank (1) is equipped with injection pump (5), electrolytic tank (1) is provided with air inlet (10) and air outlet (9), the water inlet end of injection pump (5) is connected with clean water through clean water pipe, clean water pipe is provided with water inlet (6) and water outlet (7), and clean water pipe water outlet end is sleeved on the bottom of working electrode (2), and working electrode (2) is connected with direct current stabilized power supply (8); Branch pipeline (21) is arranged between the clean water pipe and the injection pump (5), the hand valve (22) is installed on the branch pipeline (21), and the valve (23) is installed on the clean water pipe.

2. A low voltage electrolytic device for sewage treatment as claimed in claim 1 wherein, The device is composed of five groups of electrolytic tanks (1), each electrolytic tank (1) is connected in sequence through pipeline, and the water outlet (7) is sleeved on the working electrode (2).

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