Coalescence oil removal device for oily wastewater

Abstract

The utility model discloses a coalescence oil removal device for oily wastewater. The coalescence oil removal device comprises an ultrasonic demulsification device and a coalescence oil removal device, the coalescence oil removal device comprises a closed oil removal barrel, a sewage draining exit is formed in the bottom of the oil removal barrel, a coalescence device is fixedly arranged in the middle of the oil removal barrel, and a water inlet is formed in the side wall, below the coalescence device, of the oil removal barrel; an oil discharge port and an exhaust port are respectively formed in the top of the oil removal barrel, and the exhaust port is higher than the oil discharge port; the oil discharge outlet is communicated with a liquid inlet in the bottom of the visual oil collector through a pipeline, and an oil outlet is formed in the top of the visual oil collector; a liquid outlet of the ultrasonic demulsification device is communicated with a water inlet of the oil removal barrel. According to the utility model, oil drops or suspended matters in oil-containing wastewater can be quickly gathered, coalesced, floated (or settled) and separated in water, and oil, water and mud in the oil-containing wastewater can be effectively and quickly separated.

Description

Technical field:

[0001] The utility model relates to the field of treatment of oily wastewater, in particular to a coalescence and oil removal device for oily wastewater. Background technology:

[0002] Oily wastewater is often discharged during industrial production. The oil substances contained in oily wastewater include natural petroleum, petroleum products, tar and its fractions, as well as edible animal and vegetable oils and fats. In terms of water pollution, oil and tar are the main sources. The hazards of oily wastewater are mainly manifested in the serious impact on soil, plants and water bodies.

[0003] Oily wastewater can penetrate into the pores of the soil to form an oil film, which will cause a blocking effect and prevent air and water from penetrating, which is not conducive to the growth of crops and may even cause the crops to wither. When oily wastewater is discharged into a water body, an oil film will be formed on the water surface, hindering the migration of oxygen in the air to the water body, and will cause aquatic organisms to die due to severe hypoxia. Oily wastewater discharged into urban sewage pipes will have adverse effects on the pipes, ancillary equipment and urban sewage treatment plants.

[0004] In the process of treating oily wastewater, due to the complex nature of the refined oil in the device and the unstable operation of the oil removal system, the high oil content in the dewatering leads to a low dewatering qualification rate, and the high concentration of pollutants seriously impacts the subsequent sewage treatment system. Therefore, it is urgent to innovate the sewage treatment process and technology through technical research, realize the separation of oil, water and mud in oily sewage, and ensure that the sewage discharge meets the standards. Utility model content:

[0005] In order to solve the above problems, the utility model aims to provide a coalescence and oil removal device for oily wastewater.

[0006] The utility model is implemented by the following technical solutions:

[0007] A coalescence and oil removal device for oily wastewater, comprising an ultrasonic demulsification device and a coalescence and oil removal device;

[0008] The coalescence oil removal device comprises a closed oil removal cylinder, a sewage outlet is provided at the bottom of the oil removal cylinder, a coalescence device is fixedly provided in the middle of the oil removal cylinder, a water inlet is provided on the side wall of the oil removal cylinder below the coalescence device; an oil discharge port and an exhaust port are respectively provided on the top of the oil removal cylinder, and the position height of the exhaust port is higher than the position height of the oil discharge port; a water outlet is provided on the side wall of the upper part of the oil removal cylinder; the oil discharge port is connected with the liquid inlet at the bottom of the visual oil collector through a pipeline, and an oil outlet is provided on the top of the visual oil collector;

[0009] The liquid outlet of the ultrasonic demulsification device is communicated with the water inlet of the oil removal cylinder.

[0010] Furthermore, it also includes a dissolved air pump and a dissolved air water pipeline;

[0011] The liquid outlet of the ultrasonic demulsification device is divided into two paths, one of which is connected to the water inlet end of the dissolved air water pipeline through a pipeline, and the other is connected to the water inlet end of the dissolved air pump through a pipeline;

[0012] An air-dissolved water inlet is provided upstream of the air-dissolved water pipeline, and an air-dissolved water outlet of the air-dissolved water pump is connected to the air-dissolved water inlet through a pipeline;

[0013] The water outlet end of the dissolved air water pipeline is communicated with the water inlet of the oil removal cylinder.

[0014] Furthermore, the dissolved air water pipeline is fixedly coiled on the outer wall of the oil removal cylinder, and the central angle corresponding to the length of the dissolved air water pipeline between the dissolved air water inlet and the water outlet of the dissolved air water pipeline is not less than 180°.

[0015] Furthermore, the water outlet of the dissolved air water pipeline is connected to the water inlet of at least two release pipes arranged horizontally and in parallel, the release pipes are straight pipes, and the water outlet direction of the release pipes is tangent to the inner wall of the oil removal cylinder;

[0016] Water inlets corresponding to the positions of the release pipes and equal in number are provided on the side wall of the oil removal cylinder, and the water outlet ends of the release pipes are connected to the water inlets of the oil removal cylinder in a one-to-one correspondence.

[0017] Furthermore, a flow stabilizing baffle is provided in the oil removal cylinder above the coalescing device and below the water outlet, and a plurality of through holes are opened on the flow stabilizing baffle.

[0018] Furthermore, the coalescing device comprises a horizontally arranged fixing plate, the fixing plate is sealed and fixedly connected to the inner wall of the oil removal cylinder; a plurality of water holes are opened on the fixing plate;

[0019] A coalescing filter cartridge is fixedly provided at each water passage hole, the bottom end of the coalescing filter cartridge is fixedly connected to the fixing plate around the corresponding water passage hole, and the top end of the coalescing filter cartridge is a closed structure.

[0020] Advantages of the utility model:

[0021] The ultrasonic demulsification device can reduce the oil-water interface strength and oil viscosity, making the interface film easy to break and accelerating oil-water separation; the dissolved air pump adopts a full-pressure dissolved air method to mix the gas with the oily wastewater, so that the gas dissolved in the water is released in the form of microbubbles; because the dissolved air water pipeline is coiled on the outer wall of the oil removal cylinder, the dissolved air water enters the oil removal cylinder in a swirling state, and under the action of the swirling centrifugal force, the contact between the bubbles and the oil droplets is accelerated, and the floating oil can be separated faster; under the action of the coalescing device, the small oil droplets gather together and coalesce to form large oil droplets. Under the action of the steady flow baffle, the swirling state of the dissolved air water can be reduced, so that the wastewater containing oil tends to flow horizontally, which is more conducive to oil-water separation.

[0022] The utility model can realize the rapid aggregation, agglomeration, floating (or sinking) and separation of oil droplets or suspended matter in oily wastewater in water, and realize the effective and rapid separation of oil, water and mud in oily wastewater. Description of the drawings:

[0023] Figure 1 It is a structural schematic diagram of this embodiment;

[0024] Figure 2 yes Figure 1 AA section diagram in .

[0025] In the figure: ultrasonic demulsification device 1, coalescence oil removal device 2, oil removal cylinder 21, sewage outlet 22, fixing plate 23, water hole 24, coalescence filter cartridge 25, visual oil collector 26, dissolved air pump 27, dissolved air water pipeline 28, release pipe 29, flow stabilizing baffle 210, through hole 211, water outlet 212, exhaust port 213. Specific implementation method:

[0026] like Figure 1 , Figure 2 The device for coalescing and removing oil from oily wastewater shown in the figure comprises an ultrasonic demulsification device 1 and a coalescing and removing oil device 2;

[0027] The coalescence oil removal device 2 comprises a closed oil removal cylinder 21, a sewage outlet 22 is provided at the bottom of the oil removal cylinder 21, a coalescence device is fixedly provided in the middle of the oil removal cylinder 21, and a water inlet is provided on the side wall of the oil removal cylinder 21 below the coalescence device; an oil discharge port and an exhaust port 213 are respectively provided at the top of the oil removal cylinder 21, and the position height of the exhaust port 213 is higher than the position height of the oil discharge port; a water outlet 212 is provided on the side wall of the upper part of the oil removal cylinder 21; the oil discharge port is connected to the liquid inlet at the bottom of the visible oil collector 26 through a pipeline, and an oil outlet is provided at the top of the visible oil collector 26;

[0028] The coalescing device includes a horizontally arranged fixed plate 23, which is sealed and fixedly connected to the inner wall of the oil removal cylinder 21; a plurality of water holes 24 are opened on the fixed plate 23; a coalescing filter cartridge 25 is fixedly arranged at each water hole 24, the bottom end of the coalescing filter cartridge 25 is fixedly connected to the fixed plate 23 around the corresponding water hole 24, and the top end of the coalescing filter cartridge 25 is a closed structure. In this embodiment, the filter element in the coalescing filter cartridge 25 adopts an oleophilic and water-blocking separation material.

[0029] The liquid outlet of the ultrasonic demulsifying device 1 is communicated with the water inlet of the oil removal cylinder 21 .

[0030] This embodiment also includes a dissolved air pump 27 and a dissolved air water pipeline 28;

[0031] The liquid outlet of the ultrasonic demulsification device 1 is divided into two paths, one of which is connected to the water inlet end of the dissolved air water pipeline 28 through a pipeline, and the other is connected to the water inlet end of the dissolved air pump 27 through a pipeline;

[0032] An air-dissolved water inlet is provided upstream of the air-dissolved water pipeline 28, and an air-dissolved water outlet of the air-dissolved water pump 27 is connected to the air-dissolved water inlet through a pipeline;

[0033] The water outlet end of the dissolved air water pipeline 28 is communicated with the water inlet of the oil removal cylinder 21 .

[0034] The dissolved air water pipe 28 is fixedly coiled on the outer wall of the de-oiling cylinder 21, and the central angle of the dissolved air water pipe 28 length between the dissolved air water inlet and the water outlet of the dissolved air water pipe 28 is not less than 180°. The water outlet of the dissolved air water pipe 28 is connected to the water inlet of three horizontal and parallel release pipes 29, and the release pipes 29 are straight pipes, and the water outlet direction of the release pipes 29 is tangent to the inner wall of the de-oiling cylinder 21;

[0035] Water inlets corresponding in position and equal in number to the release pipes 29 are provided on the side wall of the oil removal cylinder 21 , and the water outlet ends of the release pipes 29 are connected to the water inlets of the oil removal cylinder 21 in a one-to-one correspondence.

[0036] A flow stabilizing baffle 210 is provided in the oil removal cylinder 21 above the coalescing device and below the water outlet 212 , and a plurality of through holes 211 are opened on the flow stabilizing baffle 210 .

[0037] Job Description:

[0038] The wastewater first enters the ultrasonic demulsification device 1, and the ultrasonic wave causes the oily wastewater to generate mechanical vibration. The mechanical vibration can cause the oil "particles" to produce a displacement effect, and then the small oil droplets are condensed into large oil droplets according to the collision effect, while reducing the oil-water interface strength and oil viscosity, making the interface film easy to rupture, which can accelerate the oil-water separation.

[0039] Afterwards, the oily wastewater is mixed with the gas by a full-pressure gas dissolving method through a gas dissolving pump 27, and the gas dissolved in the water is released in the form of microbubbles by dissipating energy and reducing pressure of the pressurized gas-dissolving water; the gas-water mixture containing microbubbles enters the gas-dissolving water pipeline 28, and the particle size of the microbubbles is very small, reaching 5-30μm, while the particle size of the emulsified oil is 0.5-25μm. Within the same particle size range, the microbubbles can better capture the emulsified oil.

[0040] Since the dissolved air water pipeline 28 is coiled on the outer wall of the oil removal cylinder 21, the dissolved air water enters the oil removal cylinder 21 along the tangent direction of the inner wall of the oil removal cylinder 21 through the three-layer release pipe 29 along the dissolved air water pipeline 28, which can not only quickly reduce the inlet kinetic energy and evenly arrange the flow field to achieve a stable flow state, but also the water flow rotates in the oil removal cylinder 21 through the centrifugal force, so that the microbubbles and oil droplets are fully in contact, and the collision probability of the microbubbles and oil droplets is increased. Under the action of the cyclonic centrifugal force, the contact between the bubbles and the oil droplets is accelerated. Due to the different medium densities, the bubbles carry the oil droplets to flow to the middle area of ​​the cyclonic flow.

[0041] Under the agglomeration effect of the agglomeration device, the tiny oil droplets agglomerate, and the multi-stage agglomeration materials gradually agglomerate the small oil droplets of different particle sizes into large oil droplets that can float and separate. At the same time, under the condition that the mobile phase in the oil removal cylinder 21 provides kinetic energy, the small oil droplets in the oily wastewater will collide with each other, causing the liquid film to rupture, the small oil droplets to gather together, and agglomerate to form large oil droplets.

[0042] Under the action of the flow-stabilizing baffle 210, the swirl state of the dissolved gas water can be reduced, so that the waste water tends to flow horizontally, which is more conducive to oil-water separation, so that large oil droplets float to the top of the liquid surface and finally enter the visual oil collector 26 from the oil discharge port. The visual oil collector 26 is a container made of transparent material with an oil outlet on the top. Due to its small size, it is more convenient for the staff to control the discharge of oil according to the oil-water interface. The gas in the oil removal cylinder 21 is discharged from the exhaust port 213, and the separated suspended matter settles to the bottom of the oil removal cylinder 21 by gravity and is discharged through the sewage outlet 22 to avoid the suspended matter from being retained in the oil removal cylinder 21 for a long time and causing blockage of the equipment. After the deoiled water is discharged from the water outlet 212, it is further deep-treated or reused.

[0043] After long-term operation, flushing water can be added to the water outlet 212 so that the flushing water flows back into the oil removal cylinder 21 to clean the coalescing device and the internal structure of the oil removal cylinder 21.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coalescence and oil removal device for oily wastewater, characterized in that: It includes ultrasonic demulsification device and coalescence oil removal device; The coalescence oil removal device comprises a closed oil removal cylinder, a sewage outlet is provided at the bottom of the oil removal cylinder, a coalescence device is fixedly provided in the middle of the oil removal cylinder, and a water inlet is provided on the side wall of the oil removal cylinder below the coalescence device; an oil discharge port and an exhaust port are respectively provided on the top of the oil removal cylinder, and the position height of the exhaust port is higher than the position height of the oil discharge port; a water outlet is provided on the side wall of the upper part of the oil removal cylinder; the oil discharge port is connected with the liquid inlet at the bottom of the visual oil collector through a pipeline, and an oil outlet is provided on the top of the visual oil collector; The liquid outlet of the ultrasonic demulsification device is communicated with the water inlet of the oil removal cylinder.

2. The coalescence and oil removal device for oily wastewater according to claim 1, characterized in that: It also includes a dissolved air pump and a dissolved air water pipeline; The liquid outlet of the ultrasonic demulsification device is divided into two paths, one of which is connected to the water inlet end of the dissolved air water pipeline through a pipeline, and the other is connected to the water inlet end of the dissolved air pump through a pipeline; An air-dissolved water inlet is provided upstream of the air-dissolved water pipeline, and an air-dissolved water outlet of the air-dissolved water pump is connected to the air-dissolved water inlet through a pipeline; The water outlet end of the dissolved air water pipeline is communicated with the water inlet of the oil removal cylinder.

3. The coalescence and oil removal device for oily wastewater according to claim 2, characterized in that: The dissolved air water pipeline is fixedly coiled on the outer wall of the deoiling cylinder, and the central angle corresponding to the length of the dissolved air water pipeline between the dissolved air water inlet and the water outlet of the dissolved air water pipeline is not less than 180°.

4. The coalescence and oil removal device for oily wastewater according to claim 3, characterized in that: The water outlet of the dissolved air water pipeline is connected to the water inlet of at least two release pipes arranged horizontally and in parallel, the release pipes are straight pipes, and the water outlet direction of the release pipes is tangent to the inner wall of the oil removal cylinder; Water inlets corresponding to the positions of the release pipes and equal in number are provided on the side wall of the oil removal cylinder, and the water outlet ends of the release pipes are connected to the water inlets of the oil removal cylinder in a one-to-one correspondence.

5. The coalescence and oil removal device for oily wastewater according to claim 1, characterized in that: A flow stabilizing baffle is arranged in the oil removal cylinder above the coalescing device and below the water outlet, and a plurality of through holes are opened on the flow stabilizing baffle.

6. The coalescence and oil removal device for oily wastewater according to claim 1, characterized in that: The coalescing device comprises a horizontally arranged fixed plate, the fixed plate is sealed and fixedly connected to the inner wall of the oil removal cylinder; a plurality of water holes are opened on the fixed plate; A coalescing filter cartridge is fixedly provided at each water passage hole, the bottom end of the coalescing filter cartridge is fixedly connected to the fixing plate around the corresponding water passage hole, and the top end of the coalescing filter cartridge is a closed structure.

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