Decentralized small-scale high-efficiency oil-water separation and internal circulation treatment device and its treatment method

Abstract

This invention discloses a decentralized, small-scale, high-efficiency oil-water separation and internal circulation treatment device and its treatment method. The tank (1) of the treatment device is equipped with a flow guide (2) at the center, a water distributor (6) is installed at the bottom of the flow guide, the top and bottom of the flow guide are open, and an inclined tube component (3) is set between the flow guide and the inner wall of the tank; the water inlet of the water distributor is connected to the water inlet pipe (5), the bottom of the flow guide is equipped with a dosing pipe (7) and an aeration disc (9), and the aeration disc is connected to the air inlet pipe (8); an oil collection trough (4) is set around the inner wall of the tank at the top, the bottom of the oil collection trough is connected to the oil drain pipe (12), and the top of the oil collection trough is slightly higher than the top of the flow guide; an exhaust pipe (14) is connected to the top of the tank, a water outlet pipe (11) is connected to the bottom of the tank, and a sludge discharge pipe (10) is connected to the bottom of the tank; the oil-water dual liquid level detector (13) located at the top of the tank outputs a signal to the control cabinet (15), and the control cabinet outputs a signal to control the opening and closing of the valves of the water outlet pipe and the oil drain pipe.

Description

Technical Field

[0001] This invention relates to wastewater treatment technology, and in particular to a decentralized, small-scale, high-efficiency oil-water separator and internal circulation treatment device and its treatment method. Background Technology

[0002] With the economic development and improved living standards in rural areas of China, the volume of rural domestic sewage discharge is also increasing. Rural domestic sewage is typically small in scale, large in quantity, and highly dispersed. Moreover, due to differences in the living and production methods of residents in different regions, the water quality and quantity vary greatly, and there are also significant daily, monthly, and annual variations. Therefore, the traditional centralized collection and treatment model is difficult to effectively implement in rural domestic sewage treatment due to factors such as high costs, large land acquisition areas, and difficulties in operation and maintenance.

[0003] On the other hand, many rural areas now have agritainment facilities and rural inns, but the large-scale increase in oily wastewater from kitchen waste in a short period of time is difficult to adapt to the existing pipes and treatment facilities in rural areas, leading to clogging of pipe networks and facilities by oil. Therefore, there is a need for a small-scale, decentralized oil-water separation treatment device and treatment method that can be adapted to local conditions and treated on-site for high-oil domestic wastewater in rural areas.

[0004] Currently, examples of using oil-water separators to treat rural domestic sewage include: Chinese patent CN 209507674U discloses an oil-water separator suitable for decentralized sewage treatment tanks in rural areas. This device includes a sedimentation tank, an oil floating tank, and an oil removal tank. Oil is floated using a gas generator, then conveyed to the oil removal tank by an oil scraper, and finally collected by activated carbon and oil-absorbing felt. This equipment is simple and convenient, but collecting oil requires the consumption of activated carbon and oil-absorbing felt, resulting in significant material consumption and the need for regular replacement by personnel, making subsequent operation and maintenance time-consuming and labor-intensive. There are also devices that achieve oil-water separation using floats. Chinese patent CN117160080 A discloses a float-type oil-water separation device for an oil separator. This device has high oil collection efficiency and is unaffected by the outlet height or flow rate. Parameter adjustment is relatively convenient, and the oil collection cycle can be determined according to the specific circumstances of different users. However, this device is large in size and requires a heater and drive motor, making it difficult to address the space constraints and tight maintenance costs that may be encountered in rural sewage treatment.

[0005] Existing oil-water separation equipment and treatment methods for domestic sewage have not yet been able to achieve stable treatment of high-oil domestic sewage in rural areas where water quality and quantity fluctuate drastically, and cannot solve the problems of difficult operation and maintenance and insufficient manpower in rural sewage treatment. Summary of the Invention

[0006] The purpose of this invention is to provide a decentralized, small-scale, high-efficiency oil-water separation and internal circulation treatment device and its treatment method. This invention integrates multi-phase treatment of solids, wastewater, and oil, achieving oil-water separation of oily wastewater, and combining multiple functions such as wastewater phosphorus treatment and SS treatment into one device, thus realizing the preliminary comprehensive treatment of oily wastewater in rural areas.

[0007] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0008] A decentralized, small-scale, high-efficiency oil-water separation and internal circulation treatment device includes a tank, a guide tube, an inclined tube component, an oil collection tank, a water inlet pipe, a water distributor, a chemical dosing pipe, an air inlet pipe, an aeration disc, a sludge discharge pipe, a water outlet pipe, an oil discharge pipe, an exhaust pipe, an oil-water dual liquid level detector, and a control cabinet.

[0009] A flow guide tube is installed at the center of the tank, and the flow guide tube is located in the middle section of the tank; a water distributor is installed at the lower part of the flow guide tube, and the top and bottom of the flow guide tube are open. An inclined tube component is installed in the cavity between the outer surface of the flow guide tube and the inner wall of the tank.

[0010] The water distributor's inlet is connected to the inlet pipe, and the water distributor's outlet is connected to the guide tube.

[0011] The bottom of the guide tube is equipped with a dosing pipe and an aeration disc. The dosing pipe is connected to the input drug, the aeration disc is connected to the air inlet pipe, and the air inlet pipe is connected to the blower.

[0012] An oil collection trough is provided around the inner wall of the upper part of the tank. An oil collection trough has a hole at the bottom for connecting an external oil drain pipe. The top of the oil collection trough is slightly higher than the top of the guide cylinder.

[0013] The tank has a hole at the top for connecting an external exhaust pipe, a hole at the bottom for connecting an external water outlet pipe, and a hole at the bottom for connecting an external sludge discharge pipe.

[0014] The oil-water dual level detector is located on the top of the tank. The output signal of the oil-water dual level detector is connected to the control cabinet, and the output signal of the control cabinet controls the opening and closing of the valves of the water outlet pipe and the oil outlet pipe.

[0015] The inclined tube component is mounted on the inclined tube component support, which is located above the water distributor at the bottom of the guide tube, and both ends of the inclined tube component support are fixed to the inner wall of the tank and the outer surface of the guide tube.

[0016] The angle at which the inclined tube component is positioned on the inclined tube component support is 60° with respect to the horizontal direction.

[0017] The inclined tube component is composed of several layers, and the cross-section of the inclined tube component is honeycomb-shaped.

[0018] The water distributor is wrapped around the outside of the guide tube, and a water channel is evenly arranged on the pipe wall between the water distributor and the guide tube, so that the water in the water distributor enters the guide tube through the water channel.

[0019] The bottom of the tank is sloped, and the hole for the external sludge discharge pipe is located at the lowest point of the tank bottom; the bottom of the guide tube is at least 50cm away from the bottom of the tank.

[0020] The outlet of the dosing pipe is located higher than the aeration disc and slightly lower than the water distributor.

[0021] The oil collection trough consists of a vertical baffle and an inclined baffle. The vertical baffle is parallel to the inner wall of the tank and has narrow, elongated flow holes evenly distributed on it. The flow holes are horizontal. The inclined baffle forms the inclined surface at the bottom of the oil collection trough, and an opening is provided at the lowest point of the bottom of the oil collection trough for connecting an external oil drain pipe.

[0022] A decentralized, small-scale, high-efficiency oil-water separation and internal circulation treatment method includes the following steps:

[0023] Step 1: Wastewater entering through the inlet pipe flows from the periphery to the center into the guide cylinder through the water distributor. The wastewater flowing into the guide cylinder comes into contact with the chemicals output from the dosing pipe and the air bubbles sprayed out by the aeration disc, thus performing preliminary treatment on the wastewater.

[0024] Step 2: The wastewater flows from bottom to top inside the guide tube. The bubbles with oil droplets attached aggregate at the top of the guide tube. The gas escapes from the interface and separates from the liquid phase, and is discharged from the exhaust pipe. The oil droplets remain at the top to form floating oil.

[0025] Step 3: Gas is continuously injected from the aeration disc at the bottom of the guide tube, and bubbles continuously emerge from the center of the liquid surface at the top of the guide tube, continuously pushing the top oil layer to move in all directions, helping the oil layer to gather in the oil collection tank to complete the oil separation.

[0026] Step 4: The liquid at the top of the guide tube flows out from the top opening of the guide tube and flows from top to bottom through the inclined tube component in the area between the guide tube and the inner wall of the tank. The flow state of the sewage in the inclined tube component is laminar. The oil droplets and flocs that are not completely separated in the sewage come into further contact in the inclined tube component and converge into larger oil droplets or flocs. The oil floats up and re-converges to the top oil layer, while the solid particles and sewage flow downward.

[0027] Step 5: The wastewater flowing out through the inclined tube component re-enters the guide tube from the bottom, mixes with the wastewater inside the guide tube, rises to the top opening of the guide tube and flows down, continuously circulating.

[0028] Step 6: The oil-water dual level detector located at the top of the tank detects the liquid level inside the tank. The oil-water dual level detector outputs a signal to the control cabinet, and the control cabinet outputs a signal to control the valves of the water outlet pipe and the oil outlet pipe to discharge and close.

[0029] The vertical baffle of the oil collection tank is evenly distributed with narrow, elongated, horizontally oriented flow holes. When the oil layer height in the tank is lower than the height of the flow holes in the oil collection tank, the outlet valve is closed to raise the water level in the tank. When the sewage level in the tank is close to the height of the flow holes in the oil collection tank, the outlet valve is opened to maintain the oil layer at the position of the flow holes in the oil collection tank. When the liquid level in the tank exceeds the set height, the outlet valve is opened and an alarm message is issued.

[0030] This invention relates to a decentralized, small-scale, high-efficiency oil-water separation and internal circulation treatment device. A guide tube is installed inside the tank, with a dosing pipe and an aeration disc at the bottom. By using the guide tube, the aeration rate of sewage in different areas is altered. Utilizing the density difference, the sewage flow within the treatment device forms an internal circulation. Addressing the characteristics of drastic fluctuations in the quality and quantity of high-oil domestic sewage in rural areas, this invention enhances the treatment device's resistance to shocks, avoids problems of excessive or insufficient chemical dosing due to changes in influent water quality and quantity, and ensures stable treatment results.

[0031] The treatment device of the present invention isolates the sewage from the top turbulent zone by setting an inclined tube component between the guide tube and the inner wall of the tank, thereby changing the flow state and growth process of the sewage settling zone, blocking the disturbance of the water flow by the gas movement, and preventing loose flocs from being re-dispersed under the action of the water flow, thus enhancing the separation effect between sewage, oil and solid particles in the settling zone between the guide tube and the inner wall of the tank.

[0032] This invention uses a guide tube to fix the gas venting point at the center of the liquid surface at the top of the guide tube, continuously pushing the top oil layer to move in all directions and gather in the oil collection tank, thereby enhancing the oil-water separation effect of the oil collection tank and better completing the oil separation.

[0033] This invention links the liquid level inside the tank with the opening and closing of the water outlet valve and the oil drain valve. It controls the valve operation based on the internal liquid level and oil-water separation status, maintaining the oil layer at the position of the oil collection tank's flow passage to ensure effective oil-water separation. Furthermore, it provides an alarm to alert maintenance personnel when the operation is unsuitable, thus achieving automatic control of the processing device.

[0034] This invention integrates multi-phase treatment of solids, wastewater, and oil, achieving oil-water separation of oily wastewater, and combining multiple functions such as wastewater phosphorus treatment and SS treatment into one device, ultimately realizing the preliminary comprehensive treatment of oily wastewater in rural areas. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the decentralized small-scale high-efficiency oil-water separation and internal circulation treatment device of the present invention.

[0036] Figure 2 This is a schematic diagram showing the connection between the water distributor and the guide tube of the present invention;

[0037] Figure 3This is a cross-sectional view of the connection between the water distributor and the guide tube of the present invention;

[0038] Figure 4 This is a schematic diagram of the oil collection tank structure of the present invention.

[0039] In the diagram: 1 Tank body, 2 Guide tube, 3 Inclined tube component, 4 Oil collection tank, 5 Water inlet pipe, 6 Water distributor, 7 Chemical dosing pipe, 8 Air inlet pipe, 9 Aeration disc, 10 Sludge discharge pipe, 11 Water outlet pipe, 12 Oil discharge pipe, 13 Oil-water dual liquid level detector, 14 Exhaust pipe, 15 Control cabinet, 16 Inclined tube component support, 21 Water passage tank, 41 Flow passage hole. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0041] In response to the characteristics of drastic fluctuations in the quality and quantity of high-oil domestic sewage in rural areas, the treatment device of this invention is equipped with a guide tube inside the tank, a dosing pipe and an aeration disc at the bottom of the guide tube, and an inclined tube component between the guide tube and the inner wall of the tank. This achieves stable treatment of oily domestic sewage, reduces waste of chemicals, improves the impact resistance of the equipment, increases the stability of the process, and avoids the impact and blockage of high-oil sewage on downstream pipelines and rural sewage treatment facilities.

[0042] See Figure 1 A decentralized, small-scale, high-efficiency oil-water separation and internal circulation treatment device includes: a tank 1, a guide cylinder 2, an inclined tube component 3, an oil collection tank 4, a water inlet pipe 5, a water distributor 6, a dosing pipe 7, an air inlet pipe 8, an aeration disc 9, a sludge discharge pipe 10, a water outlet pipe 11, an oil discharge pipe 12, an exhaust pipe 14, an oil-water dual-level detector 13, and a control cabinet 15. The guide cylinder 2 is installed at the center of the tank 1, located in the middle section of the tank 1. A water distributor 6 is installed at the lower part of the guide cylinder 2. The guide cylinder 2 has openings at the top and bottom, and an inclined tube component 3 is installed in the cavity between the outer surface of the guide cylinder 2 and the inner wall of the tank 1. The water inlet of the water distributor 6 is connected to the water inlet pipe 5, and the water outlet of the water distributor 6 is connected to the inside of the guide cylinder 2. A dosing pipe 7 and an aeration disc 9 are installed inside the bottom of the guide cylinder 2. The dosing pipe 7 is connected to the input chemical, and the aeration disc 9 is connected to the air inlet pipe 8, which is connected to a blower.

[0043] An oil collection trough 4 is arranged around the inner wall of the upper part of the tank body 1, with an opening at the bottom of the oil collection trough 4 for connecting to an external oil drain pipe 12; the top of the oil collection trough 4 is slightly higher than the top of the guide cylinder 2. An exhaust pipe 14 is connected to an external opening at the top of the tank body 1, a water outlet pipe 11 is connected to an external opening at the lower part of the tank body 1, and a sludge discharge pipe 10 is connected to an external opening at the bottom of the tank body 1. An oil-water dual-level detector 13 is located at the top of the tank body 1, and its output signal is connected to a control cabinet 15. The control cabinet 15 outputs signals to control the opening and closing of the valves of the water outlet pipe 11 and the oil drain pipe 12. The valves of the water outlet pipe 11 and the oil drain pipe 12 are solenoid valves.

[0044] The tank 1 is cylindrical, rectangular, or square. In this embodiment, the tank 1 is cylindrical, and the guide tube 2 is cylindrical. The bottom of the tank 1 is sloped, and the hole for the external sludge discharge pipe 10 is located near the lowest point of the bottom of the tank 1. The bottom of the guide tube 2 is at least 50cm away from the bottom of the tank 1 to avoid disturbing the sludge inside the tank 1.

[0045] See Figure 2 and Figure 3 The inlet pipe 5 is connected to the inlet of the water distributor 6, and the outlet of the water distributor 6 is connected to the inside of the guide cylinder 2. Furthermore, the water distributor 6 is wrapped around the outside of the guide cylinder 2, or fitted onto the outside of the guide cylinder 2. The water distributor 6 is annular, and a water channel 21 is evenly arranged on the pipe wall between the water distributor 6 and the guide cylinder 2, allowing the water distributor 6 to communicate with the guide cylinder 2. The oily wastewater input from the inlet pipe 5 first enters the water distributor 6, and then enters the guide cylinder 2 through the water channel 21, achieving a uniform water distribution within the guide cylinder 2.

[0046] A dosing pipe 7 and an aeration disc 9 are located at the center of the bottom of the guide tube 2. The dosing pipe 7 is connected to an external metering pump for the input of chemicals, facilitating control of the dosage and delivery of demulsifiers and flocculants. The aeration disc 9 is connected to a blower via an air inlet pipe 8, which facilitates the delivery of microbubbles within the guide tube 2. The outlet of the dosing pipe 7 is positioned higher than the aeration disc 9 and slightly lower than the water distributor 6, ensuring that the added chemicals are thoroughly mixed with the newly entering wastewater under the hydraulic propulsion, achieving optimal mixing.

[0047] The inclined tube component 3 is mounted on the inclined tube component support 16, which is located above the water distributor 6 at the bottom of the guide tube 2. Both ends of the inclined tube component support 16 are fixed to the inner wall of the tank 1 and the outer surface of the guide tube 2. The guide tube 2 can be fixed inside the tank 1 by an upper and lower support, which serve as the inclined tube component support 16. The angle at which the inclined tube component 3 is mounted on the inclined tube component support 16 is 60° to the horizontal. The inclined tube component 3 is composed of several layers of plates, and its cross-section is honeycomb-shaped. The inclined tube component 3 is typically made of corrugated plastic panels, cut to size and then mounted on the inclined tube component support 16. By setting an inclined tube component 3 between the guide tube 2 and the inner wall of the tank 1, the flow of sewage in the inclined tube component 3 becomes laminar flow and the flow path is lengthened, which isolates the sewage from the top turbulent flow zone at the top opening of the guide tube 2, changes the flow state and lengthens the flow path of the sewage settling zone, thereby enhancing the separation effect between sewage, oil and solid particles in the settling zone between the guide tube 2 and the inner wall of the tank 1.

[0048] See Figure 4The upper part of the tank body 1 is provided with an oil collection trough 4 along the inner wall of the tank body 1. The oil collection trough 4 is composed of vertical baffles and inclined baffles. The vertical baffles are parallel to the inner wall of the tank body 1. Narrow and elongated flow holes 41 are evenly distributed on the vertical baffles. The flow holes 41 are arranged horizontally to ensure that the relatively pure grease in the oil layer at the top of the tank body 1 can overflow into the oil collection trough 4 through the flow holes 41. The inclined baffles form the inclined surface at the bottom of the oil collection trough 4. The lowest point of the bottom of the oil collection trough 4 has a hole connected to an external oil drain pipe 12, which facilitates the collection of grease in the oil collection trough 4 and its discharge through the oil drain pipe 12.

[0049] This invention uses a guide tube 2 to fix the gas escaping point at the center of the liquid surface, continuously pushing the top oil layer to move outwards and gather in the oil collection tank 4, thus enhancing the oil-water separation effect of the oil collection tank 4 and better completing the oil separation. By linking the liquid level in the tank 1 with the opening and closing of the valves of the water outlet pipe 11 and the oil drain pipe 12, the valve opening and closing are controlled according to the liquid level inside the tank and the oil-water separation situation, maintaining the oil layer at a certain position in the oil collection tank 4, ensuring the oil-water separation effect, and realizing the automatic control of the device.

[0050] Oily pollutants in rural wastewater mainly originate from kitchen wastewater, including floating oil, dispersed oil, and emulsified oil. Emulsified oil, in particular, has a small particle size and is stable and difficult to separate within the wastewater medium. This invention provides a decentralized, small-scale, high-efficiency oil-water separator with internal circulation treatment method. This method utilizes the aforementioned decentralized, small-scale, high-efficiency oil-water separator with internal circulation treatment device and includes the following steps: [See details] Figure 1 ,

[0051] Step 1: Wastewater input through inlet pipe 5 enters the guide cylinder 2 from all sides towards the center via water distributor 6. The wastewater flowing into the guide cylinder 2 comes into contact with the chemicals output from dosing pipe 7 and the bubbles sprayed from aeration disc 9, maximizing uniform contact between the wastewater and the bubbles and chemicals for optimal contact effect and preliminary wastewater treatment. Bubbles and flocs in the wastewater adhere to tiny dispersed oil particles in the oily wastewater, rising to the water surface due to the apparent density difference between the bubbles and chemicals and the water within the guide cylinder 2. Simultaneously, by adding a demulsifier, the hydration film of the emulsified oil droplets is broken, compressing the double electric layer and achieving oil-water separation; by adding a flocculant, the floc particle size is increased, thereby enhancing the collision probability between bubbles and oil droplets / flocs. Utilizing the bridging effect of the flocculant, tiny oil droplets and particles combine into larger aggregates, improving treatment performance. This invention, by adding different chemicals, can achieve oil-water separation, wastewater phosphorus treatment, and chemical and physical treatment of SS (suspended solids).

[0052] Step 2: The sewage flows from bottom to top inside the guide tube 2. The bubbles with oil droplets attached aggregate at the top of the guide tube 2. The gas exits the interface and separates from the liquid phase, and is discharged from the exhaust pipe 14. The oil droplets remain at the top to form floating oil.

[0053] In step 3, the gas ejected from the aeration disc 9 at the bottom of the guide tube 2 is continuously injected, and bubbles continuously emerge from the center of the liquid surface at the top of the guide tube 2, continuously pushing the top oil layer to move in all directions, helping the oil layer to gather in the oil collection tank 4, enhancing the oil-water separation effect of the oil collection tank 4, and better completing the oil separation.

[0054] Step 4: Liquid flows out from the top opening of the guide tube 2 and flows downwards through the inclined tube component 3 in the area between the guide tube 2 and the inner wall of the tank 1. The liquid flowing out from the top opening of the guide tube 2 has increased density due to the overflow of bubbles, creating a turbulent zone at the top of the guide tube 2. The presence of the inclined tube component 3 isolates the wastewater from the turbulent zone at the top, making the flow state of the wastewater laminar within the inclined tube component 3. This increases the flow path and allows incompletely separated oil droplets and flocs in the wastewater to further contact inside the inclined tube component 3, converging into larger oil droplets or flocs. Based on their density differences, the oil rises and re-aggregates to the top oil layer, while solid particles and wastewater flow downwards. This region avoids disturbance from gas injection, enhancing the solid-liquid separation effect. The wastewater that has passed through the laminar flow of the inclined tube component 3 is called the second treatment.

[0055] Step 5: The wastewater that has undergone secondary treatment and flows out of the inclined tube component 3 re-enters the guide tube 2 from the bottom, mixes with the wastewater inside the guide tube 2, rises to the top opening of the guide tube 2 and flows down, continuously circulating. Due to the difference in aeration volume, the wastewater inside and outside the guide tube 2 has a different density. The density difference between the two causes the flow of wastewater in the tank 1 to form an internal circulation, that is, the wastewater outside the guide tube 2 enters the guide tube 2 from the bottom, rises to the top of the guide tube 2 and flows down, continuously circulating.

[0056] Since the quality and quantity of rural domestic sewage often fluctuate, the sewage in the tank 1 of the treatment device of this invention maintains a constant flow and circulation, which keeps the dosage of chemicals constant. Oil and solid impurities in the sewage that have not yet separated from their stable state can be remixed with the chemicals during the circulation process. Therefore, the treatment device of this invention can adapt to changes in the quality and quantity of incoming water, avoiding the impact on separation efficiency due to excessive or insufficient chemical dosage.

[0057] Step 6: The oil-water dual level detector 13 located at the top of the tank 1 detects the liquid level inside the tank 1. The oil-water dual level detector 13 outputs a signal to the control cabinet 15. The control cabinet 15 outputs a signal to control the valve of the water outlet pipe 11 and the valve of the oil drain pipe 12 to discharge and close.

[0058] The vertical baffle of the oil collection tank 4 is evenly distributed with narrow, elongated, horizontally oriented flow holes 41. When the oil layer height in the tank 1 is lower than the height of the flow holes 41 in the oil collection tank, the control valve of the water outlet pipe 11 is closed to raise the water level in the tank 1. When the sewage level in the tank 1 is close to the height of the flow holes 41 in the oil collection tank, the control valve of the water outlet pipe 11 is opened to maintain the oil layer at the position of the flow holes 41 in the oil collection tank, ensuring the oil-water separation effect. When the liquid level in the tank 1 exceeds the set height, the control valve of the water outlet pipe 11 is opened, and an alarm message is issued to remind the operation and maintenance personnel to prevent sewage from overflowing from the tank 1, thereby realizing the automatic control of the treatment device of the present invention.

[0059] When the oil level in tank 1 is lower than the height of the flow hole 41 on the oil collection tank, the drain pipe 12 valve is closed; when the oil level in tank 1 is higher than the height of the flow hole 41 on the oil collection tank, the drain pipe 12 valve is opened, and the drain pipe 12 begins to drain oil normally. When the liquid level in tank 1 exceeds the set height, the drain pipe 12 valve is closed when the alarm is triggered.

[0060] Taking a rural village in eastern my country as an example, the wastewater from multiple kitchens of agritainment businesses in the village is connected to the treatment device of this invention. After being treated by the treatment device of this invention, the oil removal rate of oily wastewater can reach more than 80%, and the content of suspended solids (SS) and total phosphorus in the wastewater can be significantly reduced.

[0061] Compared with the prior art, the beneficial effects of the present invention are:

[0062] 1. This invention achieves stable treatment of high-oil domestic sewage in rural areas with drastic fluctuations in water quality and quantity through internal circulation of wastewater, avoiding complex chemical dosing and minimizing chemical waste. It also improves the shock resistance of the treatment device, increases process stability, and prevents high-oil sewage from impacting and clogging downstream pipelines and rural sewage treatment facilities.

[0063] 2. The processing device of the present invention is equipped with a dual liquid level detector, whose signal feedback automatically controls the processing device, realizing optimal control of oil and water discharge, enhancing the oil separation effect, eliminating the need for manual control, adapting to the problem of difficult operation and maintenance and insufficient manpower in rural sewage, and reducing the investment in later management.

[0064] 3. The treatment device of the present invention uses the super-aeration air sprayed from the aeration disc as the sole power source, making full use of the hydraulic characteristics to realize the internal circulation of sewage flow and the directional accumulation of oil layer, thereby enhancing the oil-water separation effect, achieving multiple benefits at once, and fully realizing the rational use of energy.

[0065] 4. This invention takes into account multi-phase integrated treatment, and simultaneously realizes multiple functions such as oil-water separation of oily wastewater, wastewater phosphorus treatment, and SS treatment. While ensuring the stable operation of the device, it integrates multiple functions into one device. In view of the lower requirements of rural wastewater treatment, the device is modular and easy to operate, making it easy to install and maintain on site.

[0066] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A decentralized, small-scale, high-efficiency oil-water separation and internal circulation treatment device, characterized in that: Includes tank body (1), guide tube (2), inclined tube component (3), oil collection tank (4), water inlet pipe (5), water distributor (6), dosing pipe (7), air inlet pipe (8), aeration disc (9), sludge discharge pipe (10), water outlet pipe (11), oil discharge pipe (12), exhaust pipe (14), oil-water dual liquid level detector (13), and control cabinet (15); A guide tube (2) is installed at the center of the tank (1), and the guide tube (2) is located in the middle section of the tank (1); a water distributor (6) is installed at the bottom of the guide tube (2), the top and bottom of the guide tube (2) are open, and an inclined tube component (3) is installed in the cavity between the outer surface of the guide tube (2) and the inner wall of the tank (1). The inlet of the water distributor (6) is connected to the inlet pipe (5), and the outlet of the water distributor (6) is connected to the guide tube (2). The bottom of the guide tube (2) is provided with a dosing pipe (7) and an aeration disc (9). The dosing pipe (7) is connected to the input drug, and the aeration disc (9) is connected to the air inlet pipe (8). The air inlet pipe (8) is connected to the fan. The upper part of the tank (1) is provided with an oil collection trough (4) around the inner wall of the tank (1). The bottom of the oil collection trough (4) has a hole for connecting an external oil drain pipe (12). The top of the oil collection trough (4) is slightly higher than the top of the guide tube (2). The tank (1) has a hole at the top for connecting an external exhaust pipe (14), a hole at the bottom for connecting an external water outlet pipe (11), and a hole at the bottom for connecting an external sludge discharge pipe (10). The oil-water dual level detector (13) is located on the top of the tank (1). The output signal of the oil-water dual level detector (13) is connected to the control cabinet (15). The output signal of the control cabinet (15) controls the opening and closing of the valves of the water outlet pipe (11) and the oil outlet pipe (12). The inclined tube component (3) is mounted on the inclined tube component support (16), which is located above the water distributor (6) at the bottom of the guide tube (2), and both ends of the inclined tube component support (16) are fixed to the inner wall of the tank (1) and the outer surface of the guide tube (2). The outlet of the dosing pipe (7) is higher than the aeration disc (9) and slightly lower than the water distributor (6).

2. The decentralized small-scale high-efficiency oil-water separation and internal circulation treatment device according to claim 1, characterized in that: The angle at which the inclined tube component (3) is positioned on the inclined tube component support (16) is 60° with respect to the horizontal direction.

3. The decentralized small-scale high-efficiency oil-water separation and internal circulation treatment device according to claim 1, characterized in that: The inclined tube component (3) is composed of several layers, and the cross-section of the inclined tube component (3) is honeycomb.

4. The decentralized small-scale high-efficiency oil-water separation and internal circulation treatment device according to claim 1, characterized in that: The water distributor (6) is wrapped around the outside of the guide tube (2). A water channel (21) is evenly arranged on the pipe wall between the water distributor (6) and the guide tube (2) so that the water in the water distributor (6) enters the guide tube (2) through the water channel (21).

5. The decentralized small-scale high-efficiency oil-water separation and internal circulation treatment device according to claim 1, characterized in that: The bottom of the tank (1) is sloping, and the hole of the external mud discharge pipe (10) is opened at the bottom of the tank (1) near the lowest point; the bottom of the guide tube (2) is at least 50cm away from the bottom of the tank (1).

6. The decentralized small-scale high-efficiency oil-water separation and internal circulation treatment device according to claim 1, characterized in that: The oil collection tank (4) is composed of a vertical baffle and an inclined baffle. The vertical baffle is parallel to the inner wall of the tank body (1). Narrow and long flow holes (41) are evenly distributed on the vertical baffle. The flow holes (41) are horizontal. The inclined baffle forms the bottom inclined surface of the oil collection tank (4). A hole is opened at the lowest point of the bottom of the oil collection tank (4) to connect the external oil drain pipe (12).

7. A method for treating oily wastewater using the decentralized small-scale high-efficiency oil-water separator with internal circulation as described in claim 1, characterized in that, Includes the following steps: Step 1: The sewage input from the inlet pipe (5) enters the guide cylinder (2) from all sides to the center through the water distributor (6). The sewage flowing into the guide cylinder (2) comes into contact with the medicine output from the dosing pipe (7) and the air bubbles sprayed out by the aeration disc (9) to perform preliminary treatment on the sewage. Step 2: The sewage flows from bottom to top inside the guide tube (2). The bubbles with oil droplets adhering to them aggregate at the top of the guide tube (2). The gas exits the interface and separates from the liquid phase, and is discharged from the exhaust pipe (14). The oil droplets remain at the top to form floating oil. Step 3: Gas sprayed from the aeration disc (9) at the bottom of the guide tube (2) is continuously injected, and bubbles continuously emerge from the center of the liquid surface at the top of the guide tube (2), continuously pushing the top oil layer to move in all directions, helping the oil layer to gather in the oil collection tank (4) to complete the separation of oil. Step 4, the liquid at the top of the guide tube (2) flows out from the top opening of the guide tube (2), and flows from top to bottom through the inclined tube component (3) in the area between the guide tube (2) and the inner wall of the tank (1). The flow state of the sewage in the inclined tube component (3) is laminar. The oil droplets and flocs that are not completely separated in the sewage come into further contact in the inclined tube component (3) and converge into larger oil droplets or flocs. The oil floats up and re-converges to the top oil layer, while the solid particles and sewage flow downward. Step 5: The sewage flowing out through the inclined tube component (3) re-enters the guide tube (2) from the bottom of the guide tube (2), mixes with the sewage in the guide tube (2), rises to the top opening of the guide tube (2) and flows down, continuously circulating; Step 6: The oil-water dual level detector (13) located on the top of the tank (1) detects the liquid level inside the tank (1). The oil-water dual level detector (13) outputs a signal to the control cabinet (15). The control cabinet (15) outputs a signal to control the valves of the water outlet pipe (11) and the oil drain pipe (12) to discharge and close.

8. The processing method according to claim 7, characterized in that: The oil collection tank (4) consists of a vertical baffle and an inclined baffle. The vertical baffle is parallel to the inner wall of the tank (1), and the inclined baffle forms the bottom inclined surface of the oil collection tank (4). The lowest point of the bottom of the oil collection tank (4) has a hole for connecting the external oil drain pipe (12). Narrow and long horizontal flow holes (41) are evenly distributed on the vertical baffle. When the oil layer height in the tank (1) is lower than the height of the flow hole (41) on the oil collection tank, the outlet pipe (11) valve is closed to raise the water level in the tank. When the sewage level in the tank (1) is close to the height of the flow hole (41) on the oil collection tank, the outlet pipe (11) valve is opened to maintain the oil layer at the position of the flow hole (41) in the oil collection tank. When the sewage level in the tank (1) exceeds the set height, the outlet pipe (11) valve is opened and an alarm message is issued.

9. The processing method according to claim 7, characterized in that: The oil collection tank (4) is composed of a vertical baffle and an inclined baffle. The vertical baffle is parallel to the inner wall of the tank (1), and the inclined baffle forms the inclined surface at the bottom of the oil collection tank (4). The lowest point of the bottom of the oil collection tank (4) has a hole connected to the external oil drain pipe (12). Narrow and long horizontal flow holes (41) are evenly distributed on the vertical baffle. When the oil layer height in the tank (1) is lower than the height of the flow hole (41) on the oil collection tank, the oil drain pipe (12) valve is closed. When the oil layer height in the tank (1) is higher than the height of the flow hole (41) on the oil collection tank, the oil drain pipe (12) valve is opened, and the oil drain pipe (12) begins to drain oil normally.

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