Oil removal device for sewage treatment tank

Abstract

The invention discloses an oil removal device for a sewage treatment tank, which is characterized by comprising a fixed oil separation plate arranged between two sides of the upper end of an inner cavity of a tank body of the sewage treatment tank along the width direction, and an oil collection pipe arranged on the upstream side of the fixed oil separation plate along the width direction, the oil collecting pipe is connected with an oil discharging pipeline. According to the scheme, floating oil stains can be blocked and gathered by means of the fixed oil separation plate which is fixedly arranged, and then the oil stains are collected by means of the oil collection pipe and enter the oil discharge pipeline to be discharged. Compared with an existing treatment mode of flowing oil and water in different directions, floating oil can be better prevented from falling off due to disturbance, and the oil removal effect can be better improved.

Description

[0001] The present application is a divisional application of the patent application No. 202311856997.6, filed on December 29, 2023, entitled "Sewage Influent Treatment and Deposition Oil Removal System". TECHNICAL FIELD

[0002] The present application relates to the technical field of sewage treatment equipment, in particular to an oil removal device for a sewage treatment tank. BACKGROUND

[0003] Urban domestic sewage and enterprise factory production and processing wastewater are usually discharged to a sewage treatment plant for treatment. Oil pollution often mixes into the sewage inflow of the treatment plant, especially in the sewage treatment plants in areas with a high concentration of industries, a large amount of industrial wastewater oil pollution often flows in irregularly. It is difficult to achieve the degradation and treatment of oil pollution using conventional sewage treatment processes, and the presence of oil pollution can cause great pollution and influence to the filtration and biochemical treatment links, especially for sewage treatment plants using MBR process, which brings great trouble to the operation of the treatment plant.

[0004] The sewage plant usually uses an oil separation tank to treat sewage oil pollution. The oil separation tank is a wastewater pretreatment structure that uses the density difference between oil droplets and water to produce an upward floating effect to remove floatable oil substances in oil-containing wastewater. The structure of the oil separation tank is usually a horizontal flow type. The oil-containing wastewater enters the rectangular oil separation tank through the water distribution tank and flows slowly along the horizontal direction. The oil floats to the water surface during the flow, and is pushed into the oil collection pipe by the oil scraping machine or the oil scraping machine arranged on the tank surface. The heavy oil and other impurities precipitated in the oil separation tank accumulate in the sludge hopper at the bottom of the tank, and are discharged into the sludge pipe through the sludge discharge pipe. The wastewater treated by the oil separation tank is then overflowed into the drainage channel and discharged outside the tank for subsequent treatment to remove emulsified oil and other pollutants.

[0005] In order to improve the oil removal effect, the prior art also has a counter-flow inclined plate (tube) type oil separation tank, which increases the inclined partition plate to separate the water flow space, which is more conducive to the upward accumulation of floating oil. However, the conventional counter-flow inclined plate (tube) oil separation tank still has the defects of complex structure, high tank body, difficult civil engineering, easy re-mixing of oil and water, and relatively poor oil removal and decontamination.

[0006] Therefore, it is necessary to design an oil-containing sewage treatment equipment with higher oil removal and decontamination efficiency, better effect and more convenient use. SUMMARY

[0007] In view of the above shortcomings of the prior art, the technical problem to be solved by the present application is to provide a sewage influent treatment and deposition oil removal system with higher oil removal and decontamination efficiency, better effect and more convenient use, and an oil removal device for a sewage treatment tank.

[0008] To solve the above technical problems, the present application adopts the following technical solutions.

[0009] The sewage water inlet treatment and oil removal system comprises a sewage treatment tank, a sewage water inlet pipe is arranged at the water inlet end of the sewage treatment tank, the sewage water inlet pipe is connected to the lower part of the water inlet end of the sewage treatment tank, a plurality of inclined plates are arranged in groups between the water inlet end and the water outlet end in the sewage treatment tank, the inclined plates are arranged along the water flow direction and are spaced apart along the width direction, an oil removal device is arranged above the inclined plates, characterized in that outer water baffle plates are arranged vertically on both sides of the sewage treatment tank, the outer water baffle plates are hollow and form a sludge sliding channel in the inner cavity, the lower end of the sludge sliding channel is communicated with a sewage discharge pipe, the outer side of the inclined plate is arranged downwardly and the lower end is fixed on the outer water baffle plate, a slotted gap is arranged on the upper surface of the inclined plate at the joint between the inner side of the outer water baffle plate and the inclined plate, a downwardly triangular sludge collecting hopper is further arranged at the lower end of the sewage treatment tank, the lower end of the inclined plate which is not in contact with the outer water baffle plate is located above the sludge collecting hopper and the space between the inclined plates is directly communicated with the sludge collecting hopper below, and the sludge collecting hopper is communicated with the sewage discharge pipe.

[0010] In this way, the sewage flows through the inclined plates in the tank body and is forcibly separated into a plurality of narrow flow spaces by the inclined plates, so as to slow down the flow rate of the sewage and better make the sludge precipitate downward and the oil float upward. Since the sludge sliding channel is separately arranged on the outer side of the inclined plate, most of the sludge precipitated on the inclined plate can slide into the sludge sliding channel and be discharged outside, and the remaining sludge is collected by the sludge collecting hopper below the tank body and then discharged outside. Therefore, the sludge discharge channel is increased, the sludge discharge smoothness is improved, and the sludge is prevented from mixing with the sewage again during the sludge discharge process to avoid poor decontamination effect. In addition, the water inlet from the lower end upward can reduce water inlet interference and avoid water drop with air, which is beneficial to the smooth flow of the water in the tank body and better sludge sedimentation and oil floating.

[0011] Further, a flow regulating cavity is arranged at the water inlet end of the sewage treatment tank, flow regulating water distribution hole plates are arranged in front of and behind the flow regulating cavity along the width direction of the tank body and are separated from the inclined plates, and water passing holes are uniformly arranged on the flow regulating water distribution hole plates.

[0012] In this way, the flow regulating and uniform water distribution effects can be better achieved, the smooth flow of the sewage in the inclined plate area can be better ensured, and the sludge sedimentation and oil floating can be better facilitated.

[0013] Further, an overflow weir is arranged at the upper part of the water outlet end of the sewage treatment tank, and the water outlet of the overflow weir is connected with a water outlet pipe.

[0014] In this way, the overflow water outlet is adopted, which is more conducive to avoiding water disturbance in the tank body.

[0015] Further, the water inlet side of the overflow weir is vertically slidably provided with an adjustable weir plate, and a weir plate lifting adjusting mechanism is further arranged between the adjustable weir plate and the pool wall. In this way, the overflow water can be adjusted to adapt to the water level.

[0016] Further, the weir plate lifting adjusting mechanism comprises a vertically arranged nut fixed to the weir plate, and a adjusting screw rod rotatably positioned on the pool wall and having its lower end fitted into the nut, and an adjusting handle is further arranged on the upper end of the adjusting screw rod.

[0017] In this way, the weir plate can be conveniently adjusted up and down by rotating the screw rod and relying on the screw nut transmission, which is very convenient and fast.

[0018] Further, the inner lower end of the sludge collecting hopper is further provided with a sewage suction pipeline, the outer lower side of the sewage suction pipeline is provided with a sewage suction aperture, the sewage suction pipeline is connected to the pool body outside and communicates with a sewage discharge pipeline, and a sludge pump is installed on the sewage discharge pipeline.

[0019] In this way, the sludge pump can be used to suck away the sludge deposited in the sludge collecting hopper in a suction manner, avoiding the interference of sewage discharge on the water body. In implementation, the lower end of the sludge sliding channel can be treated in the same way, which will not be described in detail here.

[0020] Further, the inner part of the sludge collecting hopper is divided into a plurality of width direction arranged sludge separating plates along the length direction. In this way, the sludge collecting hopper is divided in the length direction, which can better avoid mutual disturbance when discharging sludge.

[0021] Further, the upper part of the sludge collecting hopper is further provided with backwashing pipes arranged along the length direction on both sides, the backwashing pipes are connected to a backwashing water source pipeline, and the backwashing pipes are provided with holes for water washing.

[0022] In this way, the backwashing pipeline can be opened for backwashing when needed, which can better clean the sludge collecting hopper and avoid blockage of the sewage suction pipeline.

[0023] Further, the oil removal device comprises a fixed oil separating plate arranged between the upper ends of both sides of the pool body cavity along the width direction, and a oil collecting pipe arranged on the upstream side of the fixed oil separating plate along the width direction, the upstream side of the oil collecting pipe is provided with an oil inlet opening, and the oil collecting pipe is connected to a oil discharge pipeline.

[0024] In this way, the fixed oil separating plate is used to block the floating oil to make it gather, and then the oil collecting pipe is used to collect the oil into the oil discharge pipeline. Compared with the existing oil and water flow in different directions, the disturbance caused by the floating oil can be better avoided, and the oil removal effect can be better improved.

[0025] Further, the oil collecting pipe is rotatably arranged. In this way, the position of the oil inlet opening can be conveniently adjusted as needed.

[0026] Further, a horizontal rod is horizontally fixedly arranged at a position adjacent to the upstream end of the oil collecting pipe, and a row of oil-wetted hydrophobic materials in the shape of floating fibers is fixedly arranged on the horizontal rod.

[0027] In this way, the oil-wetted hydrophobic materials in the shape of floating fibers can better converge the floating oil and gather it to the oil collecting pipe for collection and discharge.

[0028] Further, the horizontal rod is suspended above the position adjacent to the surface of the sewage, and the oil-wetted hydrophobic materials (with a density consistent with or slightly greater than that of the floating oil) are suspended in the water body between the horizontal rod and the oil collecting pipe.

[0029] In this way, the horizontal rod itself does not affect the water flow, and it is more convenient to lock the floating oil by relying on the oil-wetted hydrophobic materials suspended in the water body between the horizontal rod and the oil collecting pipe when the amount of floating oil is small, so as to prevent the floating oil from escaping with the water flow beyond the oil collecting pipe and the oil separation plate. At the same time, the oil-wetted hydrophobic materials suspended in the water body between the horizontal rod and the oil collecting pipe also raise the surface of the floating oil at this position, and in combination with the structure of the oil collecting pipe that can be rotationally adjusted, the floating oil can be conveniently adjusted to enter the oil collecting pipe while the sewage cannot, so as to better achieve floating oil collection.

[0030] Further, a movable oil separation plate is further arranged in close contact with the downstream side of the fixed oil separation plate, and the movable oil separation plate is slidably arranged. An adjusting float is fixedly arranged at a middle position on the upstream side of the movable oil separation plate, and the overall specific gravity of the adjusting float and the movable oil separation plate is between that of water and oil.

[0031] In this way, because the amount of water can be controlled by the water inlet gate valve during equipment processing to ensure that the water level is at the required working water level, the positions of the oil collecting pipe and the fixed oil separation plate can remain unchanged. However, the oil content in the sewage source cannot be controlled, and sometimes a high oil content in the sewage can result in a very thick oil layer above the oil separation tank, but a low oil content in the sewage can result in a thin oil layer, and the thickness of the oil layer changes greatly. Therefore, if the fixed oil separation plate is too short, it can easily cause oil to run off when the oil content is high, but if it is too long, it can interfere with the normal flow of the sewage when the oil content is low. Therefore, the applicant creatively designs a movable oil separation plate that can float up and down below the fixed oil separation plate. In this way, the lower end of the movable oil separation plate is always at a fixed suitable depth in the water body, and the suitable depth does not change with the change in the thickness of the oil. Therefore, it can ensure that the oil can be perfectly intercepted without interfering with the flow of the water body to the greatest extent under any circumstances.

[0032] Further, limit blocks are arranged on the pool body side walls on the front and rear sides of the movable oil separation plate to facilitate limiting the front and rear positions thereof.

[0033] Furthermore, the float is hollow with an opening at the top that is sealed with a screw-on cap. This allows for the addition or removal of a counterweight within the float's interior, adjusting the gravity as needed. This, in turn, adjusts the depth of the movable oil separator's lower end within the water, ensuring it is positioned to perfectly intercept oil spills without disrupting water flow.

[0034] Furthermore, multiple sets of the oil removal device are arranged along the length of the pool body. This allows for better oil removal.

[0035] Furthermore, the inclined plates are arranged in groups along the length direction, with each inclined plate group having symmetrically arranged left and right sides. Several fixing ribs are provided on the end faces of the inclined plates, and the two ends of each inclined plate are fixed to the fixing ribs to form a whole. This facilitates the overall assembly of the inclined plate group.

[0036] In summary, this solution has advantages such as higher oil and dirt removal efficiency, better results, automatic adjustment according to the amount of floating oil, and greater ease of use. Attached Figure Description

[0037] Figure 1 This is a simplified planar structural diagram of the wastewater influent treatment sedimentation and oil removal system of the present invention. The arrows in the diagram indicate the flow direction.

[0038] Figure 2 for Figure 1 A schematic diagram of AA.

[0039] Figure 3 for Figure 1 A schematic diagram of BB.

[0040] Figure 4 for Figure 2 A schematic diagram of the structure of a separate oil removal device.

[0041] Figure 5 for Figure 2 A schematic diagram of the structure of a separate rectifier and distribution orifice plate. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings.

[0043] Detailed implementation methods: such as Figures 1 to 5As shown, a wastewater influent treatment sedimentation and oil removal system includes a wastewater treatment tank 1, with one end as the inlet and the other end as the outlet. A wastewater inlet pipe 7 is installed at the inlet end of the wastewater treatment tank 1, connecting from bottom to top below the inlet end. Several inclined plates 2 are arranged in groups between the inlet and outlet ends within the wastewater treatment tank. Each inclined plate 2 is arranged in the direction of water flow and spaced apart along the width direction. An oil removal device is installed above the inclined plates 2. External water barriers are vertically installed on both sides of the wastewater treatment tank 1. Plate 3, the outer baffle plate 3 is hollow and the inner cavity forms a mud sliding channel 4. The lower end of the mud sliding channel 4 is connected to the sewage pipe 5. The outer side of the inclined plate 2 is inclined downward and the lower end is fixed on the outer baffle plate 3. The inner side of the outer baffle plate 3 and the inclined plate 2 are connected at the upper surface of the inclined plate with a slit. The lower end of the sewage treatment tank is also provided with a downward triangular mud collection hopper 6. Some of the inclined plates whose lower ends do not contact the outer baffle plate are located above the mud collection hopper and are directly connected to the mud collection hopper 6 below the space between the inclined plates. The mud collection hopper is connected to the sewage pipe 5.

[0044] In this way, after the wastewater flows through the inclined plates in the tank, it is forcibly divided into several narrow flow spaces by the inclined plates, which slows down the flow rate of the wastewater and better facilitates the sedimentation of sludge downwards and the floating of oil. Because a separate sludge sliding channel is set up on the outside of the inclined plates, most of the sludge settled on the inclined plates can slide along the inclined plates to the inside and outside of the sludge sliding channel for discharge, while the remaining sludge is collected from the bottom of the tank through the sludge collection hopper and then discharged. Therefore, the increased sludge discharge channel improves the smoothness of sludge discharge and avoids the sludge re-mixing with the wastewater during the sludge discharge process, which would lead to a decrease in the decontamination effect. Furthermore, the upward water inlet from the bottom reduces water inlet interference, avoids water droplets carrying air, and promotes a smooth water flow within the tank, which is more conducive to sludge sedimentation and oil floating.

[0045] The sewage treatment tank 1 is equipped with a rectifier cavity 8 at its inlet end. A rectifier distribution plate 9 is provided between the rectifier cavity 8 and the inclined plate 2 along the width of the tank body. The rectifier distribution plate 9 is provided with evenly distributed water passage holes 10.

[0046] This allows for better rectification and uniform water distribution, ensuring smoother flow of wastewater within the inclined plate area and facilitating sludge settling and oil flotation.

[0047] An overflow weir 11 is installed at the upper part of the outlet of the sewage treatment tank 1, and the outlet of the overflow weir 11 is connected to the outlet pipe 12.

[0048] This overflow method helps to avoid disturbing the water in the pool.

[0049] The overflow weir 11 has an adjustable weir plate 13 that can be vertically slidably installed on the inlet side. A weir plate lifting and adjusting mechanism is also provided between the adjustable weir plate 13 and the pool wall. In this way, the overflow water can be adjusted to adapt to the water level.

[0050] The weir plate lifting and adjusting mechanism includes a vertically arranged nut 14 fixed to the weir plate, and an adjusting screw 15. The adjusting screw 15 is rotatably positioned on the pool wall and its lower end is fitted into the nut. An adjusting handle is also provided at the upper end of the adjusting screw 15.

[0051] This allows for easy and quick adjustment of the weir plate by rotating the lead screw and relying on the lead screw nut for transmission.

[0052] The sludge collection hopper 6 is equipped with a sludge suction pipe 16 at its lower end. The sludge suction pipe 16 has a sludge suction hole on its lower outer side. The sludge suction pipe is connected to the outside of the pool and is connected to the sewage discharge pipe 5. A sludge pump (not shown in the figure) is installed on the sewage discharge pipe 5.

[0053] In this way, the sludge deposited in the sludge collection hopper can be sucked away by a sludge pump, avoiding interference with the water body from sewage discharge. The lower end of the sludge sliding channel can be treated in the same way during implementation, which will not be detailed here.

[0054] The sludge collecting hopper is divided along its length by multiple mud-separating plates 17 arranged along its width. This separation of the sludge collecting hopper along its length helps to better prevent mutual disturbance during sludge discharge.

[0055] The upper two sides of the sludge collection hopper are provided with backwash pipes 18 arranged along the length direction. The backwash pipes 18 are connected to the backwash water source pipe and have holes for water flushing.

[0056] This allows the backwash pipe to be opened for backwashing when needed, which can better clean the sludge collection hopper and prevent the suction pipe from becoming clogged.

[0057] The oil removal device, see [link to relevant documentation]. Figure 4 It includes a fixed oil separator 19 disposed between the two sides of the upper end of the inner cavity of the pool along the width direction, and an oil collecting pipe 20 disposed on the upstream side of the fixed oil separator 19 along the width direction. The upstream side of the oil collecting pipe 20 is provided with an oil inlet opening, and the oil collecting pipe 20 is connected to the oil discharge pipe 21.

[0058] In this way, fixed oil separators are used to block and collect floating oil slicks, which are then collected by oil collection pipes and discharged through drain pipes. Compared with existing treatment methods that involve opposing oil and water flows, this method better avoids disturbances that could cause floating oil to escape, thus improving the oil removal effect.

[0059] The oil collecting pipe 20 is rotatably configured. This allows for easy adjustment of the oil inlet position as needed. In practice, the end of the oil collecting pipe 20 is connected to the oil drain pipe 21 via a rotatable sealing connector, enabling the rotation adjustment function of the oil collecting pipe 20.

[0060] Among them, a horizontal bar 22 is also fixedly installed at the upstream end of the oil collecting pipe 20, and a row of oleophilic and hydrophobic material 27 in the shape of floating catkins is fixedly installed on the horizontal bar 22.

[0061] In this way, the floating oil can be better collected by the fibrous oleophilic and hydrophobic material and gathered into the oil collection pipe for discharge.

[0062] The crossbar 22 is suspended above the surface of the sewage and adjacent to it, while the oleophilic and hydrophobic material 27 (with a density similar to or slightly greater than that of floating oil) is suspended in the water between the crossbar and the oil collection pipe.

[0063] In this way, the crossbar itself does not affect the water flow, making it easier to trap the floating oil when the amount of oil is small. This is because the oleophilic and hydrophobic material suspended in the water between the crossbar and the oil collection pipe can lock in the oil, preventing it from escaping with the water flow past the oil collection pipe and the oil separator. Simultaneously, the oleophilic and hydrophobic material suspended in the water between the crossbar and the oil collection pipe also raises the surface area of ​​the floating oil at that location. Combined with the adjustable structure of the oil collection pipe, it can be easily adjusted when the amount of floating oil is small, ensuring that the floating oil just enters the oil collection pipe while the wastewater cannot. This achieves better oil collection.

[0064] Among them, a movable oil separator 23 is also attached to the lower upstream side of the fixed oil separator. The movable oil separator can slide up and down. An adjusting float 24 is fixedly installed at the middle position of the upstream side of the movable oil separator. The overall specific gravity of the adjusting float 24 and the movable oil separator 23 is between that of water and oil.

[0065] This is because the water volume during equipment processing can be controlled by the inlet gate valve to ensure the water level is at the required operating level, thus allowing the positions of the oil collection pipe and the fixed oil separator to remain unchanged. However, the oil content in the wastewater source is unpredictable. Sometimes, high oil content in the wastewater results in a thick oil layer at the top of the oil separator, while low oil content results in a thinner oil layer, with significant variations in thickness. Therefore, if the fixed oil separator is too short, it can easily cause oil spillage when the oil volume is high, while if it is too long, it can interfere with the normal flow of wastewater when the oil volume is low. Therefore, the applicant creatively designed a movable oil separator that can float up and down below the fixed oil separator. This ensures that the lower end of the movable oil separator is always positioned at a suitable depth within the water body, a depth that does not change with variations in oil thickness. Thus, it ensures perfect oil interception under any circumstances without maximizing the preservation of water flow.

[0066] Limiting blocks 25 are also provided on the front and rear side walls of the pool body of the movable oil separator 23 to facilitate limiting its front and rear positions.

[0067] The adjusting float 24 is hollow and has an opening at the top, which is then sealed with a cap 26. A counterweight is inserted into the inner cavity of the adjusting float, allowing for adjustment of gravity by adding or removing the counterweight as needed. This adjusts the depth of the lower end of the movable oil separator within the water, ensuring it is positioned to perfectly intercept oil without interfering with water flow.

[0068] The oil removal device is arranged in multiple sets along the length of the tank, which can better achieve oil removal.

[0069] The inclined plates 2 are arranged in groups along the length direction, with each inclined plate group having symmetrically arranged left and right sides. Several fixing ribs are provided on the end faces of the inclined plates, and the two ends of each inclined plate are fixed to the fixing ribs to form a whole. This facilitates the overall assembly of the inclined plate group.

Claims

1. An oil removal device for a sewage treatment pond, characterized in that, It includes a fixed oil separator plate installed between the two sides of the upper end of the inner cavity of the sewage treatment tank along the width direction, and an oil collecting pipe installed on the upstream side of the fixed oil separator plate along the width direction. The upstream side of the oil collecting pipe is provided with an oil inlet opening, and the oil collecting pipe is connected to the oil discharge pipe.

2. The oil removal device for a sewage treatment pond as described in claim 1, characterized in that, The oil collection pipe is rotatably mounted.

3. The oil removal device for a sewage treatment pond as described in claim 1, characterized in that, A horizontal bar is also fixedly installed at the upstream end of the oil collecting pipe, and a row of oleophilic and hydrophobic materials in the shape of floating catkins are fixedly installed on the horizontal bar.

4. The oil removal device for a sewage treatment pond as described in claim 3, characterized in that, The crossbar is suspended above the surface of the sewage and adjacent to it, and the oleophilic and hydrophobic material is suspended in the water body between the crossbar and the oil collection pipe.

5. The oil removal device for a sewage treatment pond as described in claim 1, characterized in that, A movable oil separator is also attached to the lower upstream side of the fixed oil separator. The movable oil separator can slide up and down. An adjusting float is fixedly installed at the middle position of the upstream side of the movable oil separator. The specific gravity of the adjusting float and the movable oil separator as a whole is between that of water and oil.

6. The oil removal device for a sewage treatment pond as described in claim 5, characterized in that, Limiting blocks are also installed on the front and rear side walls of the pool to facilitate limiting its front and rear positions.

7. The oil removal device for a wastewater treatment pond as described in claim 5, characterized in that, The float is hollow and has an opening at the top that is sealed with a screw-on cap.

8. The oil removal device for a sewage treatment pond as described in claim 1, characterized in that, The oil removal device is provided in multiple sets along the length of the tank.

Images