Oil-containing sewage demulsification sand settling tank and use method thereof

Abstract

The invention discloses an oil-containing sewage demulsification and sand setting tank and a use method, and belongs to the technical field of oil-containing sewage gathering and transportation equipment, an oil-containing sewage medium enters a cylinder from an inlet pipe, the instant sectional area of the oil-containing sewage medium is increased at a demulsification filter screen, due to different specific gravities, liquid and solid are separated and are divided into different levels in a container, and the oil-containing sewage medium enters the cylinder from the inlet pipe; oil and water sequentially pass through the demulsification filter screen and are demulsified again, and then enter a downstream process to be subjected to oil-water separation; the solid dirt is large in specific gravity and descends into the sand collecting pipe at the bottom through the sand collecting funnel to be precipitated and gathered, the gathered dirt is pushed and extruded to the tail end of the sand collecting pipe to enter the sand collecting and water filtering pipe to be extruded and separated from the solid dirt and liquid to form semi-dry silt, and the semi-dry silt is recycled. The problems of oil-water separation, oil sludge removal and sediment isolation before oil extraction sewage enters a sewage treatment unit are solved, the device load in the sewage treatment process is ensured, sewage treatment is facilitated, human-computer interface and environment pollution caused by open-air use of an oil separation tank is reduced, and clean production is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of equipment for gathering, transporting and treating oily sewage, and particularly relates to an oily sewage demulsification and sand settling tank and a use method thereof. Background Art

[0002] A processing station's gathering and transportation system uses a grease trap to settle, isolate, and remove sand from oil-produced wastewater. Its primary function is to receive bottom water from all large tanks in the crude oil storage area and separate the oily wastewater from the original stabilization unit. After progressive settling through three tanks, the oil-free wastewater is pumped from the final tank to a wastewater tank. Oil spills into an intermediate collection tank and is transferred to a tanker truck via a hot oil-melting pump truck for recovery. The oil traps are technologically backward and age-related, resulting in poor oil separation effectiveness. The recovery process is labor-intensive, with numerous human-machine interfaces and extensive oil exposure. The oil also emanates from a large area of ​​air, resulting in significant volatilization and environmental pollution. Therefore, finding a replacement for these traps became a pressing task. The key challenge in replacing these traps was demulsifying the oil-in-water in the wastewater and settling and isolating the sediment carried by the wastewater, which became a key technological breakthrough. Summary of the Invention

[0003] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide an oily wastewater demulsification and sand settling tank and a method of use, so as to solve the technical problem that the prior art cannot effectively demulsify the water-in-oil in the wastewater and settle and isolate the silt carried by the wastewater.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A demulsification and sand settling tank for oily wastewater, characterized in that it includes: an outer cylinder; an outlet pipe is provided above the outer cylinder, an inlet pipe is provided on the side wall, a demulsification filter is provided above the inner portion thereof and is connected to the inlet pipe, a heat medium cavity is provided below the demulsification filter, a sand collecting funnel is provided inside the heat medium cavity, a sand collecting pipe is provided below the sand collecting funnel, and the sand collecting pipe is connected to a sand collecting and filtering water pipe.

[0006] Preferably, the sand collecting funnel is connected to the outlet of the sand collecting pipe through a sand collecting ball valve.

[0007] Preferably, the sand collecting pipe is connected to the sand collecting and filtering water pipe through a sand collecting elbow pipe.

[0008] Preferably, spiral conveying blades are axially arranged in the sand collecting and filtering water pipe, and a liquid drain outlet is opened at the bottom of one end connected to the sand collecting elbow pipe, and a sand receiving tube and a sand discharge ball valve are sequentially connected at the bottom of the other end.

[0009] Preferably, a spiral conveying blade is axially arranged in the sand collecting pipe, and the outlet thereof is configured as a semi-blocked semicircular outlet.

[0010] Preferably, the spiral conveying blade is provided with a motor connecting shaft along the axis and is connected to the motor through the connecting shaft.

[0011] Preferably, a plurality of support columns are further provided at the bottom of the outer cylinder.

[0012] Preferably, a heat medium inlet and a heat medium outlet are provided on the side wall of the outer cylinder at the position of the heat medium cavity, and the heat medium inlet is located above the heat medium outlet.

[0013] A method for using an oily wastewater demulsification and grit settling tank comprises the following steps:

[0014] S1: The oily wastewater medium enters the demulsification filter from the inlet pipe and then enters the sand collecting funnel after demulsification;

[0015] S2: The solid dirt in the sand collecting funnel enters the sand collecting pipe where it is precipitated, gathered and squeezed;

[0016] S3: The squeezed solid dirt enters the sand collecting and filtering water pipe and is squeezed and separated from the liquid to form semi-dry sediment, which is then recycled.

[0017] Preferably, the sand collecting pipe and the sand collecting and filtering water pipe are both provided with spiral conveying blades along the axial direction, and a liquid sewage outlet is provided at the bottom of the sand collecting and filtering water pipe near one end of the sand collecting pipe:

[0018] In S2, solid waste enters the sand collecting pipe and settles and accumulates. The spiral conveying blade rotates and squeezes the solid waste to the end of the sand collecting pipe, and then enters the sand collecting filter water pipe.

[0019] In S3, after the squeezed solid waste enters the sand collection and filter water pipe, the liquid in the solid waste is discharged from the liquid drain port for recovery, forming semi-dry sediment. The spiral conveying blades inside the sand collection and filter water pipe rotate to transport the semi-dry sediment to the other end for recovery.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present application discloses an oily wastewater demulsification and sand settling tank. The oily wastewater medium enters the cylinder from the central inlet pipe. The cross-sectional area of ​​the demulsification filter increases instantly. Due to different specific gravities, the oil and water, liquid and solid are separated and divided into different layers in the container. The oil and water successively pass through the demulsification filter and are demulsified again, and then enter the downstream process from the bottom outlet for oil-water separation. The solid waste has a high specific gravity and falls into the bottom sand collection pipe through the sand collection funnel, where it precipitates and accumulates. When a certain amount is reached, the accumulated waste is pushed and squeezed to the end of the sand collection pipe and enters the sand collection filter water pipe to squeeze and separate the solid waste and liquid to form semi-dry sediment. The semi-dry sediment is then recycled and processed. This solves the problems of achieving oil-water separation, oil sludge removal, and sediment isolation of oil-producing wastewater before it enters the sewage treatment unit, ensuring the equipment load during the sewage treatment process, being more conducive to sewage treatment, reducing the human-machine interface and environmental pollution caused by the open-air use of the grease trap, and achieving clean production. It is not only efficient and fast, but also more conducive to automation, safe and reliable, providing a technical support for modern management and safe operation and maintenance.

[0022] Furthermore, the outlet of the sand collecting pipe adopts a semi-shielded semicircular outlet, which can effectively utilize the transmission force of the spiral conveying blades to squeeze the internal solid sand, squeeze out the internal moisture or oil, and rise above the liquid surface after reflux. The spiral conveying blades and the outlet diameter reduction design can ensure that the tail discharge is solid sand and mud after extrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 Schematic diagram of the internal structure of the present invention;

[0025] Figure 3 It is a partial enlarged view of the present invention.

[0026] Among them: 1-outlet pipe; 2-outer cylinder; 3-inlet pipe; 4-support column; 5-sand collecting pipe; 6-sand collecting ball valve; 7-; 8-sand collecting filter water pipe; 9-sand connecting cylinder; 10-sand discharge ball valve; 11-emulsification filter; 12-sand collecting funnel; 13-heat medium chamber; 14-spiral conveying blade; 15-motor connecting shaft; 16-sealing flange; 17-liquid discharge outlet. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] The present invention is described in further detail below with reference to the accompanying drawings:

[0030] This application discloses an oily wastewater demulsification and sand settling tank, see Figure 1 , including: an outer cylinder 2; an outlet pipe 1 is provided above the outer cylinder 2, an inlet pipe 3 is provided on the side wall, a demulsification filter 11 is provided above the inner portion thereof and is connected to the inlet pipe 3, a heat medium chamber 13 is provided below the demulsification filter 11, a sand collecting funnel 12 is provided inside the heat medium chamber 13, a sand collecting funnel 12 is provided below the sand collecting funnel 12, and a sand collecting pipe 5 is provided below the sand collecting funnel 12, and the sand collecting pipe 5 is connected to a sand collecting and filtered water pipe 8. The oily wastewater medium enters the cylinder 2 from the middle inlet pipe 3, and the cross-sectional area of ​​the demulsification filter 11 increases instantaneously. Due to the different specific gravities, the oil and water, liquid and solid are separated and divided into different layers in the container. The oil and water pass through the demulsification filter 11 in succession and are demulsified again, and then enter the downstream process from the bottom outlet for oil-water separation; the solid dirt has a high specific gravity and falls into the bottom sand collecting pipe 5 through the sand collecting funnel 12, where it precipitates and accumulates. When a certain amount is reached, the accumulated dirt is pushed and squeezed to the end of the sand collecting pipe 5 and enters the sand collecting filter water pipe 8 to squeeze and separate the solid dirt and liquid to form semi-dry sediment, which is then recycled.

[0031] This invention primarily addresses the issues of oil-water separation, sludge removal, and sediment isolation before oil-produced wastewater enters the sewage treatment unit. This ensures optimal equipment load during the sewage treatment process, facilitates wastewater treatment, reduces human-machine interface and environmental pollution caused by the use of grease traps outdoors, and achieves clean production. This process is not only efficient and fast, but also facilitates automation, safety, and reliability, providing a technical support for modern management and safe operation and maintenance.

[0032] How to use

[0033] The following steps are involved:

[0034] S1: The oily wastewater medium enters the demulsification filter 11 from the inlet pipe 3 and then enters the sand collecting funnel 12 after demulsification;

[0035] S2: The solid dirt in the sand collecting funnel 12 enters the sand collecting pipe 5 to settle, gather and be squeezed;

[0036] S3: The squeezed solid dirt enters the sand collecting and filtering water pipe 8 and is squeezed and separated from the liquid to form semi-dry sediment, which is then recycled.

[0037] In some embodiments, an oily wastewater demulsification and sand settling tank, see Figure 2 , including: an outer cylinder 2; an outlet pipe 1 is provided above the outer cylinder 2, an inlet pipe 3 is provided on the side wall, a demulsification filter 11 is provided above the inner portion thereof and is connected to the inlet pipe 3, a heat medium chamber 13 is provided below the demulsification filter 11, a sand collecting funnel 12 is provided inside the heat medium chamber 13, a sand collecting pipe 5 is provided below the sand collecting funnel 12, and the sand collecting pipe 5 is connected to the sand collecting filter water pipe 8. The sand collecting funnel 12 is connected to the outlet of the sand collecting pipe 5 through a sand collecting ball valve 6. Sewage entering from the middle is more conducive to the sedimentation separation and fluid stability of sewage. In the implementation of oil-water recovery and separation, the design of the demulsification filter 11 can effectively increase demulsification, greatly improve the oil-water separation capacity, and help to break the balance of the oil-in-water phenomenon in the sewage, so that purer sewage can enter the treatment unit and reduce the operating load of the sewage treatment device.

[0038] How to use

[0039] The following steps are involved:

[0040] S1: The oily wastewater medium enters the demulsification filter 11 from the inlet pipe 3 and then enters the sand collecting funnel 12 after demulsification;

[0041] S2: When the solid dirt in the sand collecting funnel 12 reaches a preset amount, the sand collecting ball valve 6 is opened to allow the solid dirt to enter the sand collecting pipe 5 to be precipitated, gathered and squeezed;

[0042] S3: The squeezed solid dirt enters the sand collecting and filtering water pipe 8 and is squeezed and separated from the liquid to form semi-dry sediment, which is then recycled.

[0043] In some embodiments, a demulsification and grit settling tank for oily wastewater includes: an outer cylinder 2; an outlet pipe 1 is disposed above the outer cylinder 2; an inlet pipe 3 is disposed on the sidewall; a demulsification filter 11 is disposed above the outer cylinder 2 and communicates with the inlet pipe 3; a heat medium chamber 13 is disposed below the demulsification filter 11; a sand collecting funnel 12 is disposed within the heat medium chamber 13; a sand collecting pipe 5 is disposed below the sand collecting funnel 12; and the sand collecting pipe 5 is connected to a sand collecting and filtering water pipe 8. The sand collecting pipe 5 is connected to the sand collecting and filtering water pipe 8 via a sand collecting elbow 7.

[0044] How to use

[0045] The following steps are involved:

[0046] S1: The oily wastewater medium enters the demulsification filter 11 from the inlet pipe 3 and then enters the sand collecting funnel 12 after demulsification;

[0047] S2: The solid dirt in the sand collecting funnel 12 enters the sand collecting pipe 5 to settle, gather and be squeezed;

[0048] S3: The squeezed solid dirt enters the sand collecting filter water pipe 8 through the sand collecting bend pipe 7 and is squeezed and separated from the liquid to form semi-dry sediment, which is then recycled.

[0049] In some embodiments, see Figure 3 A demulsification and grit settling tank for oily wastewater comprises an outer cylinder 2; an outlet pipe 1 is disposed above the outer cylinder 2, an inlet pipe 3 is disposed on the sidewall thereof, a demulsification filter 11 is disposed above the outer cylinder 2 and communicates with the inlet pipe 3; a heat medium chamber 13 is located below the demulsification filter 11, a sand collecting funnel 12 is disposed within the heat medium chamber 13, a sand collecting pipe 5 is disposed below the sand collecting funnel 12, and the sand collecting pipe 5 is connected to a sand collecting and filtering water pipe 8. The sand collecting pipe 5 is connected to the sand collecting and filtering water pipe 8 via a sand collecting bend 7. The sand collecting and filtering water pipe 8 is axially provided with spiral conveying blades 14, and a liquid sewage outlet 17 is provided at the bottom of one end connected to the sand collecting bend 7. The bottom of the other end is sequentially connected to a sand receiving cylinder 9 and a sand discharge ball valve 10.

[0050] How to use

[0051] The following steps are involved:

[0052] S1: The oily wastewater medium enters the demulsification filter 11 from the inlet pipe 3 and then enters the sand collecting funnel 12 after demulsification;

[0053] S2: The solid dirt in the sand collecting funnel 12 enters the sand collecting pipe 5 to settle, gather and be squeezed;

[0054] S3: The squeezed solid waste enters the sand collecting filter pipe 8 through the sand collecting bend pipe 7. The spiral conveying blades 14 rotate and squeeze the liquid in the solid waste to form semi-dry sediment. The separated liquid is discharged from the liquid sewage outlet 17 opened at the bottom. The semi-dry sediment is conveyed by the spiral conveying blades 14 to the other end higher than the liquid sewage outlet 17, and is discharged through the sand receiving tube 9 and the sand discharge ball valve 10 for recycling.

[0055] In some embodiments, a demulsification and grit settling tank for oily wastewater comprises: an outer cylinder 2; an outlet pipe 1 disposed above the outer cylinder 2; an inlet pipe 3 disposed on the sidewall; a demulsification filter 11 disposed above the outer cylinder 2 and connected to the inlet pipe 3; a heat medium chamber 13 located below the demulsification filter 11; a sand collection funnel 12 disposed within the heat medium chamber 13; a sand collection pipe 5 disposed below the sand collection funnel 12; and a sand collection pipe 5 connected to a sand collection and filter water pipe 8. The sand collection pipe 5 is connected to the sand collection and filter water pipe 8 via a sand collection elbow 7. The sand collection and filter water pipe 8 is axially provided with spiral conveying blades 14. A liquid discharge port 17 is provided at the bottom of one end connected to the sand collection elbow 7, and a sand receiving cylinder 9 and a sand discharge ball valve 10 are sequentially connected at the bottom of the other end. The sand collection pipe 5 is axially provided with spiral conveying blades 14, and its outlet is configured as a semi-shielded semicircular outlet. The semi-shielded, semicircular outlet of the sand collection pipe 5 effectively utilizes the power of the spiral conveying blades 14 to squeeze the solid sand inside, expelling any moisture or oil. After reflux, the fluid rises above the liquid level. The spiral conveying blades 14 and the reduced diameter of the outlet ensure that the final discharge is solid sand and mud after extrusion. The design of the sand collection funnel 12 further facilitates the collection and accumulation of oily sludge, mud, and other materials within the sand collection pipe 5, facilitating the forward movement of the spiral conveying blades 14. A small notch in the upper portion of the sand collection pipe 5 facilitates the expulsion of excess liquid media as the spiral conveying blades 14 rotate and push the waste forward. The narrowed outlet design facilitates the removal of water from the sludge.

[0056] How to use

[0057] The following steps are involved:

[0058] S1: The oily wastewater medium enters the demulsification filter 11 from the inlet pipe 3 and then enters the sand collecting funnel 12 after demulsification;

[0059] S2: The solid dirt in the sand collecting funnel 12 enters the sand collecting pipe 5. The spiral conveying blades 14 in the sand collecting pipe 5 rotate, precipitating, gathering and squeezing the solid dirt and discharging the squeezed solid sand and mud from the semi-shielded semicircular outlet;

[0060] S3: The squeezed solid waste enters the sand collecting filter pipe 8 through the sand collecting bend pipe 7. The spiral conveying blades 14 rotate and squeeze the liquid in the solid waste to form semi-dry sediment. The separated liquid is discharged from the liquid sewage outlet 17 opened at the bottom. The semi-dry sediment is conveyed by the spiral conveying blades 14 to the other end higher than the liquid sewage outlet 17, and is discharged through the sand receiving tube 9 and the sand discharge ball valve 10 for recycling.

[0061] In some embodiments, a demulsification and grit settling tank for oily wastewater comprises: an outer cylinder 2; an outlet pipe 1 disposed above the outer cylinder 2; an inlet pipe 3 disposed on the sidewall; a demulsification filter 11 disposed above the outer cylinder 2 and connected to the inlet pipe 3; a heat medium chamber 13 located below the demulsification filter 11; a sand collection funnel 12 disposed within the heat medium chamber 13; a sand collection pipe 5 disposed below the sand collection funnel 12; and a sand collection pipe 5 connected to a sand collection and filter water pipe 8. The sand collection pipe 5 is connected to the sand collection and filter water pipe 8 via a sand collection elbow 7. The sand collection and filter water pipe 8 is axially provided with spiral conveying blades 14. A liquid discharge port 17 is provided at the bottom of one end connected to the sand collection elbow 7, and a sand receiving cylinder 9 and a sand discharge ball valve 10 are sequentially connected at the bottom of the other end. The sand collection pipe 5 is axially provided with spiral conveying blades 14, and its outlet is configured as a semi-shielded semicircular outlet. The semi-circular outlet of the sand collection pipe 5 utilizes the power of the spiral conveying blades 14 to effectively squeeze the solid sand inside, expelling any moisture or oil. After the reflux rises to the surface of the liquid, the spiral conveying blades 14 and the reduced diameter of the outlet ensure that the tail discharge is solid sand and mud after squeezing. A motor connecting shaft 15 is provided along the axis of the spiral conveying blades 14 and is connected to the motor via the connecting shaft 15.

[0062] How to use

[0063] The following steps are involved:

[0064] S1: The oily wastewater medium enters the demulsification filter 11 from the inlet pipe 3 and then enters the sand collecting funnel 12 after demulsification;

[0065] S2: The solid dirt in the sand collecting funnel 12 enters the sand collecting pipe 5. The motor drives the spiral conveying blade 14 in the sand collecting pipe 5 to rotate, precipitating, gathering and squeezing the solid dirt and discharging the squeezed solid sand and mud from the semi-shielded semicircular outlet;

[0066] S3: The squeezed solid waste enters the sand collecting filter pipe 8 through the sand collecting bend pipe 7. The motor drives the spiral conveying blade 14 to rotate and squeeze and separate the liquid in the solid waste to form semi-dry sediment. The separated liquid is discharged from the liquid sewage outlet 17 opened at the bottom. The semi-dry sediment is conveyed by the spiral conveying blade 14 to the other end higher than the liquid sewage outlet 17, and is discharged through the sand receiving tube 9 and the sand discharge ball valve 10 for recycling.

[0067] In some embodiments, a plurality of support columns 4 are further provided at the bottom of the outer cylinder 2 .

[0068] In some embodiments, a demulsification and grit settling tank for oily wastewater comprises: an outer cylinder 2; an outlet pipe 1 disposed above the outer cylinder 2; an inlet pipe 3 disposed on the sidewall; a demulsification filter 11 disposed above the outer cylinder 2 and connected to the inlet pipe 3; a heat medium chamber 13 located below the demulsification filter 11; a sand collection funnel 12 disposed within the heat medium chamber 13; a sand collection pipe 5 disposed below the sand collection funnel 12; and a sand collection pipe 5 connected to a sand collection and filter water pipe 8. The sand collection pipe 5 is connected to the sand collection and filter water pipe 8 via a sand collection elbow 7. The sand collection and filter water pipe 8 is axially provided with spiral conveying blades 14. A liquid discharge port 17 is provided at the bottom of one end connected to the sand collection elbow 7, and a sand receiving cylinder 9 and a sand discharge ball valve 10 are sequentially connected at the bottom of the other end. The sand collection pipe 5 is axially provided with spiral conveying blades 14, and its outlet is configured as a semi-shielded semicircular outlet. The semi-circular outlet of the sand collection pipe 5 utilizes the power of the spiral conveyor blades 14 to effectively squeeze the solid sand inside, expelling any moisture or oil. After reflow, the sand rises above the liquid level. The spiral conveyor blades 14 and the reduced diameter of the outlet ensure that the final discharge is solid sand and mud after extrusion. A motor connecting shaft 15 is provided along the axis of the spiral conveyor blades 14 and is connected to the motor via this connecting shaft. Both the sand collection ball valve 6 and the sand discharge ball valve 10 are electrically controlled valves. The spiral drive rods are driven by a small motor and automatically operated by a PLC control panel with a set timer. The operating logic is to start the next stage first to prevent jamming.

[0069] How to use

[0070] The following steps are involved:

[0071] S1: The oily wastewater medium enters the demulsification filter 11 from the inlet pipe 3 and then enters the sand collecting funnel 12 after demulsification;

[0072] S2: The solid dirt in the sand collecting funnel 12 enters the sand collecting pipe 5. The motor drives the spiral conveying blade 14 in the sand collecting pipe 5 to rotate, precipitating, gathering and squeezing the solid dirt and discharging the squeezed solid sand and mud from the semi-shielded semicircular outlet;

[0073] S3: The squeezed solid waste enters the sand collecting filter pipe 8 through the sand collecting bend pipe 7. The motor drives the spiral conveying blade 14 to rotate and squeeze and separate the liquid in the solid waste to form semi-dry sediment. The separated liquid is discharged from the liquid sewage outlet 17 opened at the bottom. The semi-dry sediment is conveyed by the spiral conveying blade 14 to the other end higher than the liquid sewage outlet 17, and is discharged through the sand receiving tube 9 and the sand discharge ball valve 10 for recycling.

[0074] In some embodiments, when collecting sand, the sand collecting ball valve 6 is first opened, and after collecting for a period of time (depending on the sand content), the sand collecting ball valve 6 is closed, and the sand discharging ball valve 10 is opened until no more sand is discharged.

[0075] In some embodiments, a heat medium inlet and a heat medium outlet are provided on the sidewall of the outer cylinder 2 at the location of the heat medium cavity 13, with the heat medium inlet located above the heat medium outlet. Heat medium is filled in the heat medium cavity 13 to increase the demulsification strength by heating, thereby improving the sewage treatment efficiency.

[0076] In some embodiments, the top of the sand collection and filter pipe 8 is sealed with a flange for easy inspection and maintenance. A blind plate seal also facilitates disassembly for modification and upgrading. A sand discharge ball valve 10 is connected below for easy opening to collect semi-solid sediment.

[0077] The present application also discloses a method for using an oily wastewater demulsification and grit settling tank, comprising:

[0078] S1: The oily wastewater medium enters the demulsification filter 11 from the inlet pipe 3 and then enters the sand collecting funnel 12 after demulsification;

[0079] S2: The solid dirt in the sand collecting funnel 12 enters the sand collecting pipe 5 to settle, gather and be squeezed;

[0080] S3: The squeezed solid dirt enters the sand collecting and filtering water pipe 8 and is squeezed and separated from the liquid to form semi-dry sediment, which is then recycled.

[0081] In some embodiments, the sand collecting pipe 5 and the sand collecting and filtering water pipe 8 are both provided with spiral conveying blades 14 along the axial direction, and a liquid drainage port 17 is provided at the bottom of the sand collecting and filtering water pipe 8 near one end of the sand collecting pipe 5.

[0082] In S2, the solid waste enters the sand collecting pipe 5 and settles and accumulates. The spiral conveying blades 14 rotate and squeeze the solid waste to the end of the sand collecting pipe 5, and then enter the sand collecting and filtering water pipe 8;

[0083] In S3, after the squeezed solid waste enters the sand collecting and filtering water pipe 8, the liquid in the solid waste is discharged from the liquid drain port 17 for recovery, forming semi-dry sediment. The spiral conveying blades 14 inside the sand collecting and filtering water pipe 8 rotate to transport the semi-dry sediment to the other end for recovery.

[0084] In some embodiments, long-term out-of-use requires flushing of the spiral blades and sand collection and transfer pipes, and wet maintenance.

[0085] In this application, the oily wastewater medium enters the cylinder from the middle inlet pipeline, and the cross-sectional area increases instantly. Due to different specific gravities, the oil and water, liquid and solid are separated and divided into different layers in the container. The oil and water pass through the demulsification mesh and demulsify again, and then enter the downstream process from the bottom outlet for oil-water separation; the specific gravity of the solid dirt drops to the bottom collection pipe, where it precipitates and accumulates. When it reaches a certain amount, the bottom spiral transmission rod is rotated to push the accumulated dirt to the end of the collection pipe and push open the one-way valve to enter the dirt collection auxiliary pipe. At the same time, the liquid in the dirt enters the pressureless sewage discharge system from the discharge port at the bottom of the collection pipe and flows back to the pressureless container in front of the pump. As the solid dirt increases, the thrust piston is continuously pushed. When the piston reaches the limited position, the threaded transmission rod is rotated to push the piston forward, compressing the dirt and squeezing out the water. When the solid dirt is relatively dry, it is pushed into the collection tank at the same time. The ball valve set at the bottom is opened to discharge the semi-dry mud and sand into the collection tank. The solid dirt is collected and further dried.

[0086] This invention automatically collects sludge, squeezes and dries it, and centrally processes it, eliminating the need for long-term sludge accumulation in containers. Oil and water are demulsified through perforations, enabling oil-water separation, facilitating downstream oil-water separation operations for waste oil recovery. The entire process is sealed, eliminating the need for a human-machine interface and minimizing human risk. The lack of atmospheric contact significantly reduces environmental pollution. The elimination of a grease trap allows for safer management, reduces the workload of operators and maintenance personnel, and alleviates the inconvenience of using equipment for grease trap cleaning. This application is suitable for applications requiring the separation and isolation of different media.

[0087] The above content is only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. An oily wastewater demulsification and sand settling tank, characterized in that: include: An outer cylinder (2); an outlet pipe (1) is provided above the outer cylinder (2), an inlet pipe (3) is provided on the side wall, a demulsification filter (11) is provided above the outer cylinder and is communicated with the inlet pipe (3), a heat medium cavity (13) is provided below the demulsification filter (11), a sand collecting funnel (12) is provided inside the heat medium cavity (13), a sand collecting pipe (5) is provided below the sand collecting funnel (12), and the sand collecting pipe (5) is connected to a sand collecting and filtering water pipe (8).

2. The oily wastewater demulsification and grit settling tank according to claim 1, characterized in that: The sand collecting funnel (12) is connected to the outlet of the sand collecting pipe (5) via a sand collecting ball valve (6).

3. The oily wastewater demulsification and grit settling tank according to claim 1, characterized in that: The sand collecting pipe (5) is connected to the sand collecting and filtering water pipe (8) via a sand collecting elbow pipe (7).

4. The oily wastewater demulsification and grit settling tank according to claim 3, characterized in that: The sand collecting and filtering water pipe (8) is provided with spiral conveying blades (14) along the axial direction, and a liquid sewage outlet (17) is provided at the bottom of one end connected to the sand collecting curved pipe (7), and a sand receiving tube (9) and a sand discharge ball valve (10) are connected in sequence at the bottom of the other end.

5. The oily wastewater demulsification and grit settling tank according to claim 1, characterized in that: A spiral conveying blade (14) is axially arranged in the sand collecting pipe (5), and its outlet is arranged as a semi-blocked semicircular outlet.

6. The oily wastewater demulsification and grit settling tank according to claim 5, characterized in that: The spiral conveying blade (14) is provided with a motor connecting shaft (15) along the axis and is connected to the motor via the connecting shaft (15).

7. The oily wastewater demulsification and grit settling tank according to claim 1, characterized in that: A plurality of support columns (4) are also provided at the bottom of the outer cylinder (2).

8. The oily wastewater demulsification and grit settling tank according to claim 1, characterized in that: A heat medium inlet and a heat medium outlet are provided on the side wall of the outer cylinder (2) at the location of the heat medium cavity (13), and the heat medium inlet is located above the heat medium outlet.

9. A method for using the oily wastewater demulsification and grit settling tank according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: The oily wastewater medium enters the demulsification filter (11) from the inlet pipe (3) and then enters the sand collecting funnel (12) after demulsification; S2: The solid waste in the sand collecting funnel (12) enters the sand collecting pipe (5) to be precipitated, gathered and squeezed; S3: The squeezed solid dirt enters the sand collecting and filtering water pipe (8) and is squeezed and separated from the liquid to form semi-dry sediment, which is then recycled.

10. The method for using the oily wastewater demulsification and grit settling tank according to claim 9, characterized in that: The sand collecting pipe (5) and the sand collecting and filtering water pipe (8) are both provided with spiral conveying blades (14) along the axial direction, and the sand collecting and filtering water pipe (8) is provided with a liquid sewage outlet (17) at the bottom near one end of the sand collecting pipe (5). In S2, after the solid waste enters the sand collecting pipe (5) and settles and accumulates, the spiral conveying blade (14) rotates and squeezes the solid waste to the end of the sand collecting pipe (5), and then enters the sand collecting filter water pipe (8); In S3, after the squeezed solid waste enters the sand collecting and filtering water pipe (8), the liquid in the solid waste is discharged from the liquid sewage outlet (17) for recovery, forming semi-dry sediment. The spiral conveying blades (14) inside the sand collecting and filtering water pipe (8) rotate to transport the semi-dry sediment to the other end for recovery.

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