An oil-containing sewage treatment device

Abstract

The utility model relates to oily sewage treatment technical field, concretely is an oily sewage treatment device, the utility model discloses the sedimentation tank, electric fenton reaction subassembly and water regulating unit that communicate in proper order, electric fenton reaction subassembly includes electrolytic cell, the direct current power supply for electrolytic cell power supply, the anode and cathode that set up in electrolytic cell inside and the magnetic stirrer for stirring reactant, the anode is connected to the positive pole of direct current power supply through the wire, and the cathode is connected to the negative pole of direct current power supply through the wire.Compared with the physical method oil water separator that the main ship of prior art adopts, the utility model is based on MEF technology, through the organic combination of biodegradation, electrochemical reaction and fenton oxidation, the removal efficiency of emulsified oil and COD is improved significantly, the equipment not only has the advantages of energy -conserving high -efficient, reaction condition is mild and secondary pollution risk is low, and more effectively overcome the bottleneck that the traditional method is poor to emulsified state pollutant treatment effect.

Description

Technical Field

[0001] This utility model relates to the field of oily wastewater treatment technology, specifically an oily wastewater treatment device. Background Technology

[0002] Since the beginning of the 21st century, the shipping industry has played a significant role in the global economic process. However, while making a substantial contribution to economic growth, the problem of ship pollutant emissions has become increasingly serious. In 1973, the International Maritime Organization (IMO) issued the "International Convention for the Prevention of Pollution from Ships, 1973" to address the issue of oily wastewater discharged from ships. The MARPOL 73 / 78 Protocol officially came into effect in 1978, providing strong legal guarantees for reducing global ship pollution. Specifically, the standard for oily wastewater discharge from ship bilges was clearly stipulated: the undiluted oil content must not exceed 15 ppm. This aims to protect the environment, reduce pollutant emissions, and achieve sustainable development. Therefore, improving the degradation efficiency of ship oily wastewater treatment equipment has become a top priority in current industry research.

[0003] Currently, the oily wastewater treatment equipment used on ships is mainly based on physical methods, such as oil-water separators, which are ineffective at removing emulsified oil and COD. MEF technology, on the other hand, is a comprehensive treatment process that organically combines biodegradation, electrochemical reaction, and Fenton oxidation. Due to its advantages such as energy efficiency, mild operating environment, and low toxicity, it is gradually being applied to wastewater treatment research. Therefore, researching and developing a ship engine room oily wastewater treatment device based on MEF technology to improve the removal capacity of emulsified oil and COD is of great significance to marine ecological environment protection. Utility Model Content

[0004] The purpose of this invention is to provide an oily wastewater treatment device to solve the problems mentioned in the background art.

[0005] The objective of this utility model can be achieved through the following technical solutions: An oily wastewater treatment device includes a sedimentation tank, an electro-Fenton reaction assembly, and an effluent regulating unit connected in sequence. The electro-Fenton reaction assembly includes an electrolytic cell, a DC power supply for powering the electrolytic cell, an anode and a cathode disposed inside the electrolytic cell, and a magnetic stirrer for stirring the reactants; the anode is connected to the positive terminal of the DC power supply via a wire, and the cathode is connected to the negative terminal of the DC power supply via a wire; the effluent regulating unit includes a water pump, a pH regulating device, an oil concentration detection device, and a three-way valve.

[0006] Preferably, the sedimentation tank is equipped with a reciprocating pump 1 for inputting oily wastewater, a reciprocating pump 2 for inputting pharmaceuticals, a reciprocating pump 3 for outputting pretreated wastewater, and a slag discharge port for discharging impurities.

[0007] Preferably, the electrolytic cell is also equipped with an aeration assembly, which includes an aeration pump and a vertical aeration pipe installed inside the electrolytic cell. The aeration pump is connected to the vertical aeration pipe through an air delivery pipe.

[0008] Preferably, the outlet of the reciprocating pump three is connected to the electrolytic cell; Solenoid valves are installed on the connecting pipelines between reciprocating pump one and the settling tank, and between reciprocating pump two and the settling tank.

[0009] Preferably, the magnetic stirrer is installed at the bottom of the electrolytic cell, and the vertical aeration pipe is arranged vertically inside the electrolytic cell.

[0010] Preferably, the anode is made of carbon rod material and the cathode is made of foamed iron-nickel material.

[0011] Preferably, the outlet of the electrolytic cell is connected to the inlet of the pH adjustment device via a water pump, and the outlet of the pH adjustment device is connected to the inlet of the three-way valve via a pipe equipped with an oil concentration detection device; the two outlets of the three-way valve are respectively connected to the inlet of the sedimentation tank and a clean water outlet.

[0012] The beneficial effects of this utility model are: Compared with the physical oil-water separators mainly used in existing ships, this utility model is based on MEF technology. Through the organic combination of biodegradation, electrochemical reaction and Fenton oxidation, it significantly improves the removal efficiency of emulsified oil and COD. The equipment not only has the advantages of energy saving and high efficiency, mild reaction conditions and low risk of secondary pollution, but also effectively overcomes the bottleneck of poor treatment effect of traditional methods on emulsified pollutants. It has important practical application value for protecting the marine ecological environment.

[0013] Furthermore, this invention integrates precipitation, pH adjustment, electro-Fenton reaction, flotation, coagulation, neutralization, and online detection functions into a compact device, which greatly saves space and is especially suitable for restricted environments such as ships. Moreover, the optimized electrode configuration (carbon rod anode and foamed iron-nickel cathode) effectively reduces manufacturing costs while ensuring good catalytic activity and H2O2 generation efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the pre-processing of oily wastewater from ships according to this utility model.

[0015] The attached figures are labeled as follows: 1. Sedimentation tank; 101. Reciprocating pump one; 102. Reciprocating pump two; 103. Reciprocating pump three; 104. Slag discharge port; 2. Electro-Fenton reaction assembly; 201. Electrolytic cell; 202. DC power supply; 203. Anode; 204. Cathode; 205. Magnetic stirrer; 3. Aeration assembly; 301. Aeration pump; 302. Vertical aeration pipe; 303. Air delivery pipe; 4. Effluent regulating unit; 401. Water pump; 402. pH regulating device; 403. Oil concentration detection device; 404. Three-way valve. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] like Figure 1 As shown, the oily wastewater treatment device provided by this utility model mainly includes a sedimentation tank 1, an electro-Fenton reaction assembly 2, and an effluent regulating unit 4.

[0018] The sedimentation tank 1 is connected to reciprocating pump 101, reciprocating pump 2 102 and reciprocating pump 3 103. The outlets of reciprocating pump 101 and reciprocating pump 2 102 are connected to sedimentation tank 1. Reciprocating pump 1 is used to input oily sewage from the ship into sedimentation tank 1, and reciprocating pump 2 102 is used to input medicine into the interior of sedimentation tank 1. The reciprocating pump 101 and sedimentation tank 1, and the reciprocating pump 2 102 and sedimentation tank 12 are both controlled by solenoid valves; The sedimentation tank 1 is equipped with a slag discharge port 104, which is used to discharge the impurities generated by sedimentation.

[0019] The oily wastewater from the ship to be treated enters the sedimentation tank 1 through reciprocating pump 101. Acid (such as sulfuric acid) is added through reciprocating pump 102 to adjust the pH of the wastewater to the optimal range required for the electro-Fenton reaction (such as pH=3). At the same time, large particles settle here and are periodically discharged through the slag discharge port 104.

[0020] The oily wastewater from ships to be treated is the oily wastewater from ships that has undergone pre-sedimentation to remove silt, sand, and iron filings, such as... Figure 2 The upstream treatment method for ship oily wastewater is as follows: Oily wastewater from the ship enters a settling tank via reciprocating pump 1 for separation of impurities (sludge, rust, etc.) and oil. Impurities are discharged through the slag discharge port. The oil-water mixture then enters the anode of the MFC degradation tank via reciprocating pump 2, where an electrolytic degradation reaction occurs, and the generated electricity supplies the load. A temperature control device is installed in the anode chamber to regulate the survival environment of the bacterial strains within the anode tank. After treatment, the oil-water mixture is pumped into an ultraviolet sterilization device for sterilization and then monitored by an oil concentration detection device. If it meets the discharge standards, it is discharged from the clean water outlet; otherwise, it is returned to the settling tank via a three-way valve for further degradation until the specified standards are met.

[0021] The electro-Fenton reaction assembly 2 includes an electrolytic cell 201 and a DC power supply 202 disposed outside the electrolytic cell 201. An anode 203 and a cathode 204 are disposed inside the electrolytic cell 201. The anode 203 is made of carbon rod material and is connected to the positive terminal of the DC power supply 202 through a waterproof wire. The cathode 204 is made of foamed iron-nickel material and is connected to the negative terminal of the DC power supply 202 through a waterproof wire. The main body of the electrolytic cell 201 adopts a single-chamber design with dimensions of 10 cm × 10 cm × 15 cm and an effective volume of 1L. It has two valve switches at both ends to control the reaction residence time and two electrode insertion holes in the middle for placing electrode materials.

[0022] The inlet of the reciprocating pump 3103 is connected to the sedimentation tank 1, and the outlet is connected to the electrolytic cell 201, which is used to input the oily wastewater pretreated by the sedimentation tank 1 into the electrolytic cell 201. A magnetic stirrer 205 is installed at the bottom of the electrolytic cell 201 for mixing other reagents required for the reaction. The magnetic stirrer is turned on to ensure uniform mixing, achieving the pH and Fe content required for the electro-Fenton reaction. 2+ The concentration, after passing through the cathode plate, at the cathode surface, oxygen undergoes a reduction reaction to produce H2O2, which then reacts with the added Fe. 2+ Reaction. "Fe" 2+ It can efficiently catalyze the decomposition of H2O2, generating hydroxyl radicals (·OH) with extremely high redox potential. Due to the formation of highly oxidizing ·OH, it can effectively oxidize and dissolve pollutants such as oil in wastewater, and can also form precipitates such as Fe(OH)3 and Fe(OH)2, as well as gases with good flotation properties; An aeration assembly 3 is provided on the electrolytic cell 201. The aeration assembly 3 includes an aeration pump 301 installed outside the electrolytic cell 201 and a vertical aeration pipe 302 installed inside the electrolytic cell 201. The vertical aeration pipe 302 and the electrolytic cell 201 are connected by a gas delivery pipe 303. Dissolved oxygen is continuously supplied to the electrolytic cell 201 through the aeration assembly 3 to ensure the H2O2 generation rate and avoid the decrease in reaction efficiency due to insufficient oxygen.

[0023] The water outlet regulating unit 4 includes a water pump 401, a pH regulating device 402, an oil concentration detection device 403, and a three-way valve 404. The electrolytic cell 201, the water pump 401, the pH regulating device 402, and the three-way valve 404 are connected in sequence through pipelines. One of the ports of the three-way valve 404 is connected to the pH adjustment device 402, and the other two ports are connected to the sedimentation tank 1 and the purified water outlet, respectively. The oil concentration detection device 403 is installed on the pipeline between the pH adjustment device 402 and the three-way valve 404. The oil concentration detection device 403 is an online oil concentration meter in the prior art, used to detect the oil concentration in water.

[0024] Apart from the DC power supply and its connected anode and cathode, all other electrical equipment is connected to an external power source and controlled by a switch. Each piece of electrical equipment has its own independent control switch.

[0025] The working principle of the oily wastewater treatment device provided by this utility model is as follows: The pretreated wastewater is transported to the electro-Fenton reactor 2 by reciprocating pump 3 103. The electrolytic cell 201 is equipped with an anode 203 (carbon rod) and a cathode 204 (foamed iron-nickel electrode). An external DC power supply 202 supplies power to the anode 203 and cathode 204. An external aeration component 3 continuously aerates the reactor to provide oxygen required for the cathode reaction.

[0026] The magnetic stirrer 205 at the bottom of the reactor works continuously to ensure uniform mixing of the reactants. Under the action of the electric field and catalyst, the oxygen reduction reaction (ORR) occurs at the cathode to generate hydrogen peroxide (H2O2). H2O2 reacts with Fe²⁺ dissolved from the anode or added to the reactor to generate hydroxyl radicals (·OH), which have strong oxidizing properties. This process efficiently degrades oil and other organic matter in the water. During this process, the microbubbles generated form a flotation effect, and the precipitates such as Fe(OH)3 formed a coagulation effect, which synergistically enhances the oxidation effect.

[0027] The treated effluent enters the effluent regulating unit 4, first passing through the pH regulating device 402 (e.g., by adding alkaline solution) to adjust the acidic effluent to neutral. It then flows through the oil concentration detection device 403 for testing. If the test result meets the discharge standards (e.g., oil concentration <15 ppm), the three-way valve 404 directs the water flow to the clean water outlet; if the test result does not meet the standards, the three-way valve 404 returns the water flow to the inlet of the sedimentation tank 1 for further treatment until the standards are met.

[0028] Compared with related technologies, the oily wastewater treatment device provided by this utility model has the following beneficial effects: Compared with the physical oil-water separators mainly used in existing ships, this utility model is based on MEF technology. Through the organic combination of biodegradation, electrochemical reaction and Fenton oxidation, it significantly improves the removal efficiency of emulsified oil and COD. The equipment not only has the advantages of energy saving and high efficiency, mild reaction conditions and low risk of secondary pollution, but also effectively overcomes the bottleneck of poor treatment effect of traditional methods on emulsified pollutants. It has important practical application value for protecting the marine ecological environment.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An oily wastewater treatment device, comprising a sedimentation tank (1), an electro-Fenton reaction assembly (2), and an effluent regulating unit (4) connected in sequence, characterized in that: The electro-Fenton reaction assembly (2) includes an electrolytic cell (201), a DC power supply (202) for supplying power to the electrolytic cell (201), an anode (203) and a cathode (204) disposed inside the electrolytic cell (201), and a magnetic stirrer (205) for stirring the reactants; the anode (203) is connected to the positive terminal of the DC power supply (202) by a wire, and the cathode (204) is connected to the negative terminal of the DC power supply (202) by a wire; the water outlet regulating unit (4) includes a water pump (401), a pH regulating device (402), an oil concentration detection device (403), and a three-way valve (404).

2. The oily wastewater treatment device according to claim 1, characterized in that, The sedimentation tank (1) is equipped with a reciprocating pump 1 (101) for inputting oily wastewater, a reciprocating pump 2 (102) for inputting medicine, a reciprocating pump 3 (103) for outputting pretreated wastewater, and a slag discharge port (104) for discharging impurities.

3. The oily wastewater treatment device according to claim 2, characterized in that, An aeration assembly (3) is also provided on the electrolytic cell (201). The aeration assembly (3) includes an aeration pump (301) and a vertical aeration pipe (302) located inside the electrolytic cell (201). The aeration pump (301) is connected to the vertical aeration pipe (302) through a gas delivery pipe (303).

4. The oily wastewater treatment device according to claim 1, characterized in that, The outlet of the reciprocating pump three (103) is connected to the electrolytic cell (201); Solenoid valves are installed on the connecting pipelines between reciprocating pump one (101) and sedimentation tank (1) and between reciprocating pump two (102) and sedimentation tank (1).

5. The oily wastewater treatment device according to claim 1, characterized in that, A magnetic stirrer (205) is installed at the bottom of the electrolytic cell (201), and a vertical aeration pipe (302) is vertically arranged inside the electrolytic cell (201).

6. The oily wastewater treatment device according to claim 1, characterized in that, The anode (203) is made of carbon rod material, and the cathode (204) is made of foamed iron-nickel material.

7. The oily wastewater treatment device according to claim 1, characterized in that, The outlet of the electrolytic cell (201) is connected to the inlet of the pH adjustment device (402) via a water pump (401). The outlet of the pH adjustment device (402) is connected to the inlet of the three-way valve (404) via a pipe equipped with an oil concentration detection device (403). The two outlets of the three-way valve (404) are respectively connected to the inlet of the sedimentation tank (1) and a clean water outlet.

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