A full-automatic adsorption oil removal device suitable for low-oil wastewater

Abstract

This invention discloses a fully automatic adsorption oil removal device suitable for low-oil wastewater, comprising a rear roller, a front roller, a groove, a rotating belt, a regeneration roller, and an inclined closed side plate for adding low-oil wastewater. The bottom of the closed side plate has a groove for limiting the rotating belt. The rear roller and front roller are located below the closed side plate. The rotating belt is fitted onto the rear roller and front roller and located within the groove. Oil-absorbing cotton felt is provided on the rotating belt. A regeneration roller for squeezing the oil-absorbing cotton felt is located on one side of the front roller. This invention can simultaneously achieve rapid demulsification, adsorption, and filtration of floating oil and emulsified oil in low-oil wastewater. It has advantages such as high operating throughput, space saving, high removal efficiency of petroleum pollutants in low-oil wastewater, and low overall equipment operating consumables consumption. It improves the removal efficiency of oil pollutants, reduces the risk of clogging of subsequent water treatment equipment and environmental risks of external drainage caused by oil pollutants, and has good economic benefits.

Description

Technical Field

[0001] This invention belongs to the field of water treatment technology, specifically relating to a fully automatic adsorption oil removal device suitable for low-oil wastewater. Background Technology

[0002] Enterprises generate large amounts of oily wastewater during production processes. Oils are diverse in type, widely sourced, difficult to biodegrade, and pose significant hazards. Improper treatment or failure to meet discharge standards can severely impact environmental protection, aquaculture, soil, system equipment, industrial production, and human health. Many coal mines, power plants, and chemical plants inevitably experience oil leaks from rotating and hydraulic equipment used in their production processes. These leaks enter mine water and industrial wastewater, resulting in small amounts of floating oil in the wastewater discharge. Due to their low concentration and poor visual impact, most mine water and industrial water treatment systems lack oil removal facilities. The floating oil floats with the water flow into the water body or enters subsequent clarifiers, filters, and membrane systems, leading to excessive levels of petroleum pollutants in the water or clogging of filter layers and membrane elements in the water treatment system. This negatively impacts the ecological environment and the safe and stable operation of the process water treatment system. Currently, most oil removal equipment on the market is large in size and has a long hydraulic retention time, making it unsuitable for upgrading or retrofitting the aforementioned water treatment systems. Summary of the Invention

[0003] In view of the current situation where existing mine water and some industrial wastewater systems have large water volumes, lack corresponding oil removal facilities, and face difficulties in removing floating oil, the purpose of this invention is to provide a fully automatic adsorption oil removal device suitable for low-oil wastewater. This device can simultaneously achieve rapid adsorption and purification of floating oil and some emulsified oil in low-oil wastewater. It has advantages such as small footprint, reusable and automatically regenerated oil-absorbing materials, high removal efficiency of petroleum pollutants in low-oil wastewater, fully automated operation of the entire set of equipment, and simple operation and maintenance. It is suitable for upgrading and retrofitting existing oil removal facilities, reducing the operating burden of subsequent water treatment systems, reducing the risk of oil clogging and pollution of subsequent systems, and ensuring the safe and reliable operation of industrial water treatment systems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A fully automatic adsorption oil removal device suitable for low-oil wastewater includes a rear drum, a front drum, a groove, a rotating belt, a regeneration drum, and an inclined closed side plate for adding low-oil wastewater.

[0006] The bottom of the closed side plate is provided with a groove for limiting the rotation belt. A rear roller and a front roller are provided below the closed side plate. The rotation belt is fitted onto the rear roller and the front roller and is located in the groove. Oil-absorbing cotton felt is provided on the rotation belt. A regenerated roller for squeezing the oil-absorbing cotton felt is provided on one side of the front roller.

[0007] Furthermore, the front roller is located above the rear roller; the angle between the center lines of the front and rear rollers and the horizontal plane is 10°-20°.

[0008] Furthermore, the direction of movement of the rotating belt is opposite to the direction of flow of the low-oil wastewater in the closed side plate.

[0009] Furthermore, a water inlet is provided at one end of the closed side panel, and a water collection trough is provided at the other end, with the water inlet located above the water collection trough.

[0010] Furthermore, rotating motors are installed inside the rear drum, front drum, and regeneration drum.

[0011] Furthermore, the linear velocities of the outer surfaces of the rear roller, front roller, and regeneration roller are the same.

[0012] Furthermore, the rotational speed of the rear roller is determined by the following formula:

[0013]

[0014] Where: n1——rear drum speed, r / min;

[0015] v0 — the average flow velocity of wastewater on the rotating belt, m / s;

[0016] α—The ratio of the distance the wastewater flows on the oil-absorbing cotton felt to the length of the straight section on the upper surface of the cotton felt;

[0017] β—Flow velocity resistance coefficient;

[0018] r1 — Rear roller radius, m.

[0019] Furthermore, the rotational speed of the regeneration drum is calculated using the following formula:

[0020]

[0021] Where: n1——rear drum speed, r / min;

[0022] n2 — Regeneration drum speed, r / min;

[0023] r1—Rear roller radius, m;

[0024] r2 — radius of the regeneration drum, in meters.

[0025] Furthermore, the front roller and the rear roller have the same radius.

[0026] Furthermore, the oil-absorbing cotton felt is made of polypropylene; an oil collection tank is installed below the recycled roller and the front roller.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] This invention utilizes a rear roller, a front roller, a groove, a rotating belt, and a regeneration roller. Low-oil wastewater is added to a closed side plate and then flows onto oil-absorbing cotton felt. As the rotating belt rotates, the front roller and the regeneration roller compress the oil-absorbing cotton felt, achieving highly efficient removal of oil from the wastewater. This device integrates adsorption, collection, and regeneration into a single unit, achieving highly efficient oil removal from low-oil wastewater. It offers advantages such as space saving, high efficiency in removing petroleum pollutants from low-oil wastewater, reusable and automatically regenerated oil-absorbing material, fully automated operation, and simple operation and maintenance. This invention is suitable for oil removal systems of low-oil-content industrial wastewater in coal mines, power plants, and chemical plants. It effectively saves space, improves the efficiency of oil pollutant removal, reduces the risk of clogging of subsequent water treatment equipment and environmental risks from external drainage caused by oil pollutants, and offers significant economic benefits.

[0029] Furthermore, this invention utilizes the characteristics of polypropylene oil-absorbing material, such as fast adsorption speed, large adsorption capacity, high oil absorption ratio, no deformation after being saturated with oil, and easy regeneration, to achieve efficient removal of oily wastewater by the adsorption material.

[0030] Furthermore, this invention addresses the adsorption characteristics of oil-absorbing materials by using a roller structure in the equipment to create relative movement between the oil-absorbing cotton felt and the oily wastewater. This increases the relative contact area between the oily wastewater and the oil-absorbing cotton felt, thereby improving the adsorption efficiency of the oil-absorbing material. Simultaneously, in this invention, the oil-absorbing cotton felt undergoes a compression regeneration process with each rotation, ensuring that the oil-absorbing cotton felt in contact with the oily wastewater possesses a high adsorption capacity and superior adsorption efficiency.

[0031] Furthermore, the angle between the center lines of the front and rear rollers and the horizontal plane is 10°-20°, which ensures that the oily wastewater flows slowly and evenly on the oil-absorbing cotton felt.

[0032] Furthermore, due to the inclined design of the closed side plate, the inlet is higher than the outlet, and the oily wastewater generates a high relative velocity with the oil-absorbing cotton felt moving from bottom to top during the downward flow of the oily wastewater. The two come into full contact, so as to achieve full adsorption, separation and removal of oily pollutants. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a fully automatic adsorption oil removal device suitable for low-oil wastewater according to the present invention.

[0034] In the diagram, 1-closed side plate, 2-rear roller, 3-front roller, 4-groove, 5-rotating belt, 6-oil-absorbing cotton felt, 7-regenerating roller, 8-water collection trough, 9-water collection trough outlet, 10-oil collection pool, 11-oil collection pool outlet, 12-water inlet. Detailed Implementation

[0035] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0036] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0037] refer to Figure 1 A fully automatic adsorption oil removal device suitable for low-oil wastewater mainly includes a closed side plate 1, a rear roller 2, a front roller 3, a groove 4, a rotating belt 5, an oil-absorbing cotton felt 6, a regeneration roller 7, a water collection tank 8, a water collection tank outlet 9, an oil collection pool 10, an oil collection pool outlet 11, and a water inlet 12.

[0038] The closed side plate 1 is located at the top of the overall structure of the equipment. The rear roller 2 and the front roller 3 are fixed below the two ends of the closed side plate 1. The bottom of the closed side plate 1 is provided with a groove 4. The four sides of the groove 4 are sealed and connected to the bottom side of the closed side plate 1. The inner side of the rotating belt 5 is respectively attached to the side surface of the rear roller 2, the side surface of the front roller 3, and the groove 4, and is arranged in an elliptical ring formed by the rear roller 2, the front roller 3, and the groove 4. The oil-absorbing cotton felt 6 is fixed to the outer surface of the rotating belt 5. The regeneration roller 7 is fixed to the left side of the front roller 3. The water collection tank 8 is arranged on the right side of the closed side plate 1 and the rear roller 2. The water collection tank outlet 9 is installed at the bottom right side of the water collection tank 8. The oil collection tank 10 is installed at the bottom of the regeneration roller 7 and the front roller 3. The oil collection tank outlet 11 is installed at the bottom left side of the oil collection tank 10. The water inlet 12 is installed on the upper short side of the closed side plate 1.

[0039] Furthermore, the rear roller 2, the front roller 3, and the regeneration roller 7 are equipped with rotating motors, and the speed of the rotating motors can be adjusted steplessly.

[0040] Furthermore, the rotating belt 5 is placed on the concave surface of the groove 4, and the groove 4 serves to limit the rotation of the belt 5.

[0041] Furthermore, the recycled roller 7 comes into contact with the side of the front roller 3, and the force between the two exerts a squeezing effect on the oil-absorbing cotton felt 6.

[0042] Furthermore, the horizontal position of the regeneration drum 7 is adjustable, and the force between the contact surface of the regeneration drum 7 and the front drum 3 can be adjusted by adjusting the position of the fixing bolts.

[0043] Furthermore, the center position of the front roller 3 should be higher than that of the rear roller 2, and the angle between the center lines of the two rollers and the horizontal plane should be between 10° and 20° to ensure that the oily wastewater flows slowly and evenly on the oil-absorbing cotton felt 6.

[0044] Furthermore, the rear roller 2 and the front roller 3 rotate in the same direction during operation, and the rotation direction should drive the upper surface of the rotating belt 5 to move from the rear roller 2 to the front roller 3.

[0045] Furthermore, the linear velocity of the outer surface of the rear drum 2, front drum 3, and regeneration drum 7 should be the same during operation.

[0046] Furthermore, the operating speeds of the rear drum 2, the front drum 3, and the regeneration drum 7 can be determined by the following formula:

[0047]

[0048]

[0049] Where: n1——rear drum speed, r / min;

[0050] n2 — Regeneration drum speed, r / min;

[0051] v0 — the average flow velocity of wastewater on the rotating belt, m / s;

[0052] r1—Rear roller radius, m;

[0053] r2—Radius of the regeneration drum, in meters;

[0054] α—The ratio of the distance the wastewater flows on the oil-absorbing cotton felt to the length of the straight section on the upper surface of the cotton felt, taken as 3-7 times;

[0055] β—Water flow velocity resistance coefficient, with a value <1, ranging from 0.7 to 0.85.

[0056] The front roller 3 and the rear roller 2 rotate at the same speed; the front roller 3 and the rear roller 2 have the same radius.

[0057] Furthermore, the oil-absorbing cotton felt 6 should be made of fluffy polypropylene material that has a fast adsorption speed, large adsorption capacity, high oil absorption ratio, does not deform after being saturated with oil, and is easy to regenerate.

[0058] The oil removal method based on the above-mentioned fully automatic adsorption oil removal device suitable for low-oil wastewater includes the following operating steps:

[0059] 1) Oil Absorption: Oily wastewater enters the enclosed side plate 1 of the equipment through inlet 12, and then flows downward along the groove 4 under gravity. Simultaneously, the rear drum 2, front drum 3, and regeneration drum 7 start operating. The operating speeds of these drums can be referenced in equations (1-1) and (1-2). During the downward flow of the oily wastewater, a high relative velocity is generated between it and the upward-moving oil-absorbing cotton felt 6, ensuring sufficient contact between the two and achieving thorough adsorption, separation, and removal of oil pollutants.

[0060] 2) Regeneration of oil-absorbing cotton felt: When the oil-absorbing cotton felt 6 moves to the contact position between the upper roller 3 and the regeneration roller 7, the adsorbent in the oil-absorbing cotton felt 6 is squeezed and desorbed by the squeezing action of the rollers and the relative movement, thus realizing the regeneration and reuse of the oil-absorbing cotton felt 6. The desorbed oil-water mixture falls into the oil collection tank 10 for collection under the action of gravity.

[0061] This invention addresses the characteristics of some mine water and industrial wastewater, such as large volume, low oil content, high proportion of emulsified oil, short residence time, and difficulty in demulsification and adsorption. By integrating ultrasonic demulsification and a two-stage oil adsorption device into a single unit, it provides an integrated demulsification, adsorption, and filtration device for low-oil wastewater. This device can simultaneously achieve rapid demulsification, adsorption, and filtration of floating oil and emulsified oil in low-oil wastewater. It boasts advantages such as high operating throughput, space saving, high removal efficiency of petroleum pollutants in low-oil wastewater, and low overall equipment operating consumables consumption. It is suitable for oil removal treatment systems of low-oil industrial wastewater in coal mines, power plants, and chemical plants, improving the removal efficiency of oil pollutants, reducing the risk of fouling of subsequent water treatment equipment and environmental risks associated with external drainage caused by oil pollutants, and offering significant economic benefits.

[0062] The above description is only of the preferred embodiment of the present invention and should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All variations made within the scope of the independent claims of the present invention are also within the scope of protection of the present invention.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

Claims

1. A full-automatic adsorption oil removal device suitable for low-oil wastewater, characterized in that, The device comprises a rear roller (2), a front roller (3), a groove (4), a rotating belt (5), a regenerating roller (7) and a closed side plate (1) for adding low-oil wastewater. The bottom of the closed side plate (1) is provided with the groove (4) for limiting the rotating belt (5), and the rear roller (2) and the front roller (3) are arranged below the closed side plate (1). The rotating belt (5) is sleeved on the rear roller (2) and the front roller (3) and located in the groove (4). The rotating belt (5) is provided with oil-absorbing cotton felt (6), and the front roller (3) is provided with the regenerating roller (7) for pressing the oil-absorbing cotton felt (6). The front roller (3) is located above the rear roller (2), and the center line of the front roller (3) and the rear roller (2) and the horizontal plane form an angle of 10°-20°. The moving direction of the rotating belt is opposite to the flowing direction of the low-oil wastewater in the closed side plate. The rotating speed of the rear roller (2) is determined by the following formula: In the formula, n1 is the rotating speed of the rear roller, r / min. v 0 - average flow velocity of wastewater on the rotating belt, m / s; α - the multiple of the distance the wastewater flows on the oil absorbing cotton felt and the length of the straight section of the upper surface of the cotton felt; β - water flow velocity retardation coefficient; r 1 - back roller radius, m; The rotating speed of the regenerating roller (7) is calculated by the following formula: In the formula, n1 is the rotating speed of the rear roller, r / min. n2 is the rotating speed of the regenerating roller, r / min. r 1 - back roller radius, m; r 2 - Regenerated drum radius, m.

2. The full-automatic adsorption oil removal device suitable for low-oil wastewater of claim 1, characterized in that, One end of the closed side plate (1) is provided with a water inlet (12), and the other end is provided with a water collecting tank (8). The water inlet (12) is located above the water collecting tank (8).

3. The full-automatic adsorption oil removal device suitable for low-oil wastewater of claim 1, characterized in that, Rotating motors are installed in the rear roller (2), the front roller (3) and the regenerating roller (7).

4. The full-automatic adsorption oil removal device suitable for low-oil wastewater of claim 1, characterized in that, The linear speeds of the outer surfaces of the rear roller (2), the front roller (3) and the regenerating roller (7) are the same.

5. The full-automatic adsorption oil removal device suitable for low-oil wastewater of claim 1, wherein, The radii of the front roller (3) and the rear roller (2) are the same.

6. The full-automatic adsorption oil removal device suitable for low-oil wastewater of claim 1, characterized in that, The material of the oil-absorbing cotton felt (6) is polypropylene. The regenerating roller (7) and the front roller (3) are provided with an oil collecting tank (10) below.

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