System for treating oil-containing wastewater

Abstract

The application discloses an oil-containing wastewater treatment system, which comprises an oil-water pool, an oil collecting pool and a sewage pool, wherein the oil-water pool is provided with an oil-water inlet for oil-containing wastewater; the oil collecting pool is used for collecting oil stains in the oil-containing wastewater, a first channel is arranged between the oil collecting pool and the oil-water pool, and two ends of the first channel are communicated with the oil-water pool and the oil collecting pool respectively; the sewage pool is used for collecting sewage in the oil-containing wastewater, a second channel is arranged between the sewage pool and the oil-water pool, two ends of the second channel are communicated with the oil-water pool and the sewage pool respectively, and the sewage pool is provided with a sewage outlet for discharging the sewage; and the first channel is arranged higher than the second channel. The oil-containing wastewater treatment system can avoid that the oil-containing wastewater or the wastewater containing a large amount of oil stains is directly discharged into the external environment, thereby causing environmental pollution.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to an oily wastewater treatment system. BACKGROUND

[0002] People often produce some oily wastewater in production and life, and if the oily wastewater is directly discharged, it will cause environmental pollution. For example, when heavy oil leakage occurs in the rainwater ditch of the heavy oil storage area, the oily wastewater will be discharged to the external environment, causing environmental pollution. Therefore, it is necessary to set up an oily wastewater treatment system for treating oily wastewater. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0004] To this end, an embodiment of the present application proposes an oily wastewater treatment system to reduce the risk of environmental pollution caused by oily wastewater.

[0005] The oily wastewater treatment system of the embodiment of the present application comprises an oil-water pool, an oil collection pool and a sewage pool, the oil-water pool has an oil-water inlet for the oily wastewater to enter; the oil collection pool is used for collecting oil stains in the oily wastewater, a first channel is arranged between the oil collection pool and the oil-water pool, and two ends of the first channel are respectively communicated with the oil-water pool and the oil collection pool; the sewage pool is used for collecting sewage in the oily wastewater, a second channel is arranged between the sewage pool and the oil-water pool, and two ends of the second channel are respectively communicated with the oil-water pool and the sewage pool, and the sewage pool has a sewage outlet for the sewage to flow out; wherein the first channel is arranged higher than the second channel.

[0006] In some embodiments, the oil collection pool is arranged integrally higher than the second channel.

[0007] In some embodiments, the oil collection pool is arranged on the upper side of the second channel, and the oil collection pool is arranged between the oil-water pool and the sewage pool.

[0008] In some embodiments, the oil-water inlet and the first channel are arranged on opposite sides of the oil-water pool.

[0009] In some embodiments, a stepped buffer device is arranged in the oil-water pool, the stepped buffer device comprises a plurality of steps, and each step comprises a kick surface and a tread surface; in adjacent two steps, the kick surface of the step close to the oil-water inlet is arranged higher than the tread surface of the step away from the oil-water inlet, so as to provide a buffering effect for the oily wastewater entering the oil-water pool.

[0010] In some embodiments, the kick surface gradually inclines towards the direction close to the oil-water inlet along the direction from bottom to top.

[0011] In some embodiments, a portion of the kick surface of the step away from the oil-water inlet is higher than the tread surface of the step close to the oil-water inlet.

[0012] In some embodiments, the oil-containing wastewater treatment system further comprises a pipeline assembly, the pipeline assembly comprising a first pipe body and a second pipe body, the first pipe body comprising a sleeving section extending in the up-down direction, the first pipe body being configured to allow oil-containing wastewater to enter; the second pipe body extending in the up-down direction and being connected to the oil-water pool, the second pipe body being inserted into the oil-water inlet; wherein the second pipe body is sleeved outside the sleeving section, there is a gap between the second pipe body and the sleeving section, the lower end of the sleeving section is higher than the lower end of the second pipe body, and the second pipe body is arranged corresponding to the tread surface of the uppermost step.

[0013] In some embodiments, the sewage outlet is arranged on the side of the sewage pool away from the oil-water pool.

[0014] In some embodiments, the bottom surface of the sewage pool is arranged lower than the bottom surface of the oil-water pool.

[0015] When the oil-containing wastewater treatment system of the embodiments of the present application processes oil-containing wastewater, the oil-containing wastewater enters the oil-water pool through the oil-water inlet. In the oil-water pool, the oil and water are not easily mixed, and the specific gravity of oil is lighter than that of water. Therefore, after the oil-containing wastewater is left to stand in the oil-water pool, the oil stains and the sewage are separated and form an oil stain layer and a sewage layer, respectively, and the oil stain layer is located on the upper side of the sewage layer. Then, the first channel is arranged higher than the second channel, so that the oil stains in the oil stain layer can enter the oil collection pool through the first channel, and the sewage in the sewage layer can enter the sewage pool through the second channel, thereby realizing the separation of the oil stains and the sewage. Finally, the sewage containing no oil stains or a small amount of oil stains in the sewage pool can be discharged through the sewage outlet of the sewage pool. In this way, the oil-containing wastewater or the wastewater containing a large amount of oil stains is avoided from being directly discharged into the external environment, thereby causing environmental pollution. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of an oil-containing wastewater treatment system according to an embodiment of the present application.

[0017] Figure 2 is a structural schematic diagram of an oil-containing wastewater treatment system according to another embodiment of the present application.

[0018] Reference signs:

[0019] 100, oil-containing wastewater treatment system;

[0020] 1, oil-water pool; 11, oil-water inlet;

[0021] 2, oil collection pool;

[0022] 3, sewage pool; 31, sewage outlet;

[0023] 4, first channel;

[0024] 5, second channel;

[0025] 6, stepped buffer device; 61, kick surface; 62, tread surface;

[0026] 7, pipeline assembly; 71, first pipe body; 711, sleeving section; 72, second pipe body. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0028] As shown in Figure 1 and Figure 2 The oil-containing wastewater treatment system 100 of the embodiment of the present application includes an oil-water pool 1, an oil collection pool 2 and a sewage pool 3, the oil-water pool 1 has an oil-water inlet 11 for the oil-containing wastewater to enter. The oil collection pool 2 is used to collect oil stains in the oil-containing wastewater, a first channel 4 is arranged between the oil collection pool 2 and the oil-water pool 1, and both ends of the first channel 4 are communicated with the oil-water pool 1 and the oil collection pool 2, respectively. The sewage pool 3 is used to collect sewage in the oil-containing wastewater. A second channel 5 is arranged between the sewage pool 3 and the oil-water pool 1, both ends of the second channel 5 are communicated with the oil-water pool 1 and the sewage pool 3, respectively, and the sewage pool 3 has a sewage outlet 31 for the sewage to flow out. Among them, the first channel 4 is arranged higher than the second channel 5.

[0029] Both ends of the first channel 4 are communicated with the oil-water pool 1 and the oil collection pool 2, so that the oil-water pool 1 and the oil collection pool 2 are communicated through the principle of communicating vessels. Both ends of the second channel 5 are communicated with the oil-water pool 1 and the sewage pool 3, so that the oil-water pool 1 and the sewage pool 3 are communicated through the principle of communicating vessels.

[0030] When the oil-containing wastewater treatment system 100 of the embodiment of the present application processes the oil-containing wastewater, the oil-containing wastewater enters the oil-water pool 1 through the oil-water inlet 11. In the oil-water pool, the oil and the water are not easily mixed, and the specific gravity of the oil is lighter than that of the water. Therefore, after the oil-containing wastewater is left to stand in the oil-water pool 1, the oil stains and the sewage are stratified to form an oil stain layer and a sewage layer respectively, and the oil stain layer is located on the upside of the sewage layer. Then, the oil stains in the oil stain layer can enter the oil collection pool 2 through the first channel 4, and the sewage in the sewage layer can enter the sewage pool 3 through the second channel 5, so as to realize the separation of the oil stains and the sewage. Finally, the sewage containing no or a small amount of oil stains in the sewage pool 3 can be discharged through the sewage outlet 31 of the sewage pool 3. Thus, the oil-containing wastewater or the wastewater containing a large amount of oil stains can be avoided from being directly discharged into the external environment, thereby preventing environmental pollution.

[0031] The above-mentioned sewage can be understood as wastewater containing no or a small amount of oil stains. The wastewater containing a small amount of oil stains refers to the wastewater in the sewage pool 3, which has a lower content of oil stains than the oil-containing wastewater at the oil-water inlet 11.

[0032] It can be understood that, since the oil-water pool 1 and the sewage pool 3 are connected through the principle of communicating vessels, the oil-water pool 1 and the oil collection pool 2 are connected through the principle of communicating vessels, and the oil stain layer in the oil-water pool 1 is located on the upside of the sewage layer, the higher the first channel 4 is arranged than the second channel 5, that is, the farther the first channel 4 is arranged from the second channel 5 in the up-down direction, the more likely it is to avoid the mixing of the oil stains and the sewage in the oil-water pool 1.

[0033] In some embodiments, as shown in Figure 1 and Figure 2 , the oil collection pool 2 is arranged higher than the second channel 5 as a whole.

[0034] By arranging the oil collection pool 2 higher than the second channel 5 as a whole, the first channel 4 can be arranged farther from the second channel 5 in the up-down direction, which can effectively avoid the mixing of the oil stains and the sewage in the oil-water pool 1, and is conducive to further reducing the oil content of the sewage in the sewage pool 3 and reducing the risk of environmental pollution.

[0035] Optionally, as shown in Figure 1 and Figure 2 , the oil collection pool 2 is arranged on the upside of the second channel 5, and the oil collection pool 2 is arranged between the oil-water pool 1 and the sewage pool 3.

[0036] In order to make the technical solution of the present application easier to be understood, the technical solution of the present application will be further described below by taking the arrangement direction of the oil-water pool 1 and the sewage pool 3 consistent with the left-right direction as an example. Wherein, the left-right direction is shown in Figure 1 and Figure 2 .

[0037] For example, as shown in Figure 1and Figure 2 As shown in

[0038] By arranging the oil collection tank 2 on the upper side of the second channel 5 and between the oil-water tank 1 and the sewage tank 3, the space between the oil-water tank 1 and the sewage tank 3 can be fully utilized to reduce the floor area of the oil-containing wastewater treatment system 100 when the length of the second channel 5 is relatively long. In addition, when the length of the second channel 5 is relatively long, the flow resistance of the sewage flowing from the oil-water tank 1 to the sewage tank 3 can be increased, which is beneficial to the sedimentation of impurities with a relatively large specific gravity (greater than water) in the sewage, and further reduces the risk of environmental pollution caused by the sewage discharged from the sewage outlet 31.

[0039] Optionally, as shown in Figure 1 and Figure 2 The oil-water inlet 11 is arranged at the upper portion of the oil-water tank 1, and the second channel 5 is arranged at the lower portion of the oil-water tank 1. In this way, when the oil-containing wastewater enters the oil-water tank 1 through the oil-water inlet 11, it will cause a relatively large disturbance to the oil and dirt layer at the upper portion of the oil-water tank 1, and a relatively small disturbance to the sewage layer at the lower portion of the oil-water tank 1, which is beneficial to further reducing the oil content in the sewage in the sewage layer.

[0040] It can be understood that when the oil-containing wastewater enters the oil-water tank 1 through the oil-water inlet 11, it will cause a relatively large disturbance to the oil and dirt layer at the upper portion of the oil-water tank 1, resulting in a relatively large water content in the oil and dirt layer.

[0041] In some embodiments, as shown in Figure 1 and Figure 2 The oil-water inlet 11 and the first channel 4 are arranged on opposite sides of the oil-water tank 1.

[0042] For example, as shown in Figure 1 and Figure 2 The oil-water inlet 11 is arranged on the right side of the oil-water tank 1, and the first channel 4 is arranged on the left side of the oil-water tank 1.

[0043] By arranging the oil-water inlet 11 and the first channel 4 on opposite sides of the oil-water tank 1, the distance between the oil-water inlet 11 and the first channel 4 is relatively far, which avoids the oil and dirt with a relatively large water content from directly entering the oil collection tank 2, and is beneficial to the oil-water separation effect of the oil-containing wastewater treatment system 100.

[0044] Optionally, as shown in Figure 1 and Figure 2As shown in

[0045] For example, as shown in Figure 1 and Figure 2 The oil collecting pool 2 and the sewage pool 3 are both arranged on the left side of the oil-water pool 1, and the oil-water inlet 11 is arranged close to the right side of the oil-water pool 1. The tread surfaces 62 of the multiple steps gradually rise in the direction from left to right.

[0046] By arranging the stepped buffer device 6 in the oil-water pool 1, the flow rate and the drop of the oil-containing sewage entering through the oil-water inlet 11 can be prevented from being too large, so as to cause a large impact on the oil scum layer and the sewage layer in the oil-water pool 1, resulting in the mixing of the oil scum layer and the sewage layer, and even causing the oil-containing sewage to enter the sewage pool 3 without being stratified by standing. This is beneficial to further reduce the oil content of the sewage in the sewage pool 3 and reduce the risk of environmental pollution.

[0047] Alternatively, as shown in Figure 1 and Figure 2 The kick surface 61 gradually tilts in the direction close to the oil-water inlet 11 in the direction from bottom to top.

[0048] For example, as shown in Figure 1 and Figure 2 The kick surface 61 gradually tilts to the right in the direction from top to bottom.

[0049] By gradually tilting the kick surface 61 in the direction close to the oil-water inlet 11 in the direction from bottom to top, the flow drop of the oil-containing sewage is small when the oil-containing sewage flows from the tread surface 62 of the previous step to the tread surface 62 of the next step, and the impact on the oil scum layer and the sewage layer in the oil-water pool 1 is small. This is beneficial to further reduce the oil content of the sewage in the sewage pool 3 and reduce the risk of environmental pollution.

[0050] Alternatively, as shown in Figure 1 and Figure 2 In the adjacent two steps, a part of the kick surface 61 of the step away from the oil-water inlet 11 is arranged higher than the tread surface 62 of the step close to the oil-water inlet 11.

[0051] For example, as shown in Figure 1 and Figure 2As shown, a part of the kick face 61 of the step on the left side is higher than the tread 62 of the step on the right side. Thus, when the oil-containing wastewater on the tread 62 of the step on the right side reaches a certain height, i.e. exceeds the uppermost end of the kick face 61 of the step on the left side, the oil-containing wastewater will flow to the left through the kick face 61 of the step on the left side. Thus, the buffering effect of the oil-containing wastewater is improved, and the oil content of the wastewater in the wastewater pool 3 is further reduced, and the risk of environmental pollution is reduced. In addition, the stepped buffering device 6 can also collect impurities with a relatively large specific gravity.

[0052] Optionally, as shown in Figure 2 The oil-containing wastewater treatment system 100 further comprises a pipeline assembly 7. The pipeline assembly 7 comprises a first pipe body 71 and a second pipe body 72. The first pipe body 71 comprises a sleeving section 711 extending in the up-down direction, and the first pipe body 71 is used for allowing the oil-containing wastewater to enter. The second pipe body 72 extends in the up-down direction and is connected to the oil-water pool 1. The second pipe body 72 is inserted into the oil-water inlet 11. The second pipe body 72 is sleeved outside the sleeving section 711, and there is a gap between the second pipe body 72 and the sleeving section 711. The lower end of the sleeving section 711 is higher than the lower end of the second pipe body 72, and the second pipe body 72 is arranged corresponding to the tread 62 of the uppermost step.

[0053] It can be understood that when the oil-containing wastewater enters the oil-water pool 1 through the first pipe body 71, the oil-containing wastewater in the oil-water pool 1 will be disturbed. By arranging the pipeline assembly 7, when the oil-containing wastewater flows out through the lower end of the sleeving section 711, the second pipe body 72 sleeved outside the sleeving section 711 can limit the disturbance range of the oil-containing wastewater in the oil-water pool 1, i.e. the disturbance range is mainly in the second pipe body 72. Thus, the disturbance of the oil-containing wastewater in the oil-water pool 1 can be reduced, and the already stratified oil and wastewater in the oil-water pool 1 can be effectively prevented from mixing, which is beneficial to further reducing the oil content of the wastewater in the wastewater pool 3 and reducing the risk of environmental pollution.

[0054] Optionally, the wastewater outlet 31 is arranged on the side of the wastewater pool 3 away from the oil-water pool 1.

[0055] For example, as shown in Figure 1 and Figure 2 The wastewater pool 3 is arranged on the left side of the oil-water pool 1, and the wastewater outlet 31 is arranged on the left side of the wastewater pool 3.

[0056] By arranging the wastewater outlet 31 on the side of the wastewater pool 3 away from the oil-water pool 1, the distance between the wastewater outlet 31 and the second channel 5 is far, and the wastewater with a large oil content can be prevented from directly entering the wastewater pool 3, which is beneficial to further improving the oil-water separation effect of the oil-containing wastewater treatment system 100.

[0057] When the oil-containing wastewater further contains other impurities with large specific gravity, the impurities can be precipitated in the oil-water pool 1 and located at the bottom of the oil-water pool 1.

[0058] Optionally, the bottom surface of the sewage pool 3 is lower than the bottom surface of the oil-water pool 1. Thus, the impurities with large specific gravity precipitated at the bottom of the oil-water pool 1 can be prevented from flowing into the sewage pool 3 and being discharged through the sewage outlet 31, further reducing the risk of environmental pollution caused by the sewage discharged through the sewage outlet 31.

[0059] Optionally, a filter screen is arranged in the second channel 5 to filter out the impurities with large specific gravity, so as to prevent the impurities with large specific gravity from entering the sewage pool 3 and being discharged through the sewage outlet 31.

[0060] As shown in FIGS. Figure 1 and Figure 2 the method for using the oil-containing wastewater treatment system 100 according to the embodiment of the present application is as follows:

[0061] The oil-containing wastewater enters the oil-water pool 1 through the oil-water inlet 11, and is separated into an oil layer and a sewage layer after being stationary in the oil-water pool 1. Then, the oil in the oil layer enters the oil collection pool 2 through the first channel 4 and is collected by the oil collection pool 2, and the sewage in the sewage layer enters the sewage pool 3 through the second channel 5. After that, the sewage in the sewage pool 3 can be discharged to the outside through the sewage outlet 31. The sewage discharged through the sewage outlet 31 can enter an industrial wastewater discharge system for further treatment.

[0062] By arranging the stepped buffer device 6 in the oil-water pool 1, the flow rate of the oil-containing wastewater in the oil-water pool 1 can be prevented from being too large to directly flow into the sewage pool 3 without being stationary and separated into layers, and the impurities with large specific gravity can be collected to a certain extent.

[0063] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0064] In addition, the terms "first", "second", etc. are used only for descriptive purposes and do not connote or imply a relative importance or an ordering between or among the indicated features. Thus, a feature defined with "first", "second", etc. can include at least one of the features, either explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is at least two, for example, two, three, etc., unless otherwise specifically defined.

[0065] In the present application, unless otherwise clearly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] In the present application, unless otherwise clearly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0067] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0068] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and the changes, modifications, replacements and variations of the above embodiments made by those skilled in the art are within the scope of the present application.

Claims

1. An oily wastewater treatment system, characterized in that, include: An oil-water tank having an oil-water inlet for oily wastewater to enter; An oil collection tank is provided to collect oil from the oily wastewater. A first channel is provided between the oil collection tank and the oil-water tank, and the two ends of the first channel are respectively connected to the oil-water tank and the oil collection tank. and A wastewater tank is provided for collecting wastewater from the oily wastewater. A second channel is provided between the wastewater tank and the oil-water tank, with both ends of the second channel connected to the oil-water tank and the wastewater tank respectively. The wastewater tank has a wastewater outlet for the wastewater to flow out. Wherein, the first channel is set higher than the second channel; The oil-water tank is equipped with a stepped buffer device, which includes multiple steps, each step including a riser and a tread. In two adjacent steps, the step closer to the oil-water inlet has a higher riser surface than the step further away from the oil-water inlet, in order to provide a buffer for the oily wastewater entering the oil-water pool. The oil collection tank is located on the upper side of the second channel, and the oil collection tank is located between the oil-water tank and the sewage tank; The kick surface gradually slopes towards the oil-water inlet from bottom to top. In two adjacent steps, a portion of the riser of the step farther from the oil / water inlet is higher than the tread of the step closer to the oil / water inlet; The oily wastewater treatment system further includes a piping assembly, which comprises: A first pipe body, comprising a sleeve section extending in a vertical direction, is provided for the inflow of oily wastewater; and The second pipe extends vertically and is connected to the oil-water tank; the second pipe is inserted into the oil-water inlet. The second tube is sleeved outside the sleeved section, and there is a gap between the second tube and the sleeved section. The lower end of the sleeved section is set higher than the lower end of the second tube, and the second tube is set corresponding to the tread of the uppermost step.

2. The oily wastewater treatment system according to claim 1, characterized in that, The oil collection tank is positioned higher than the second channel.

3. The oily wastewater treatment system according to claim 1, characterized in that, The oil-water inlet and the first channel are located on opposite sides of the oil-water pool.

4. The oily wastewater treatment system according to any one of claims 1-3, characterized in that, The wastewater outlet is located on the side of the wastewater tank away from the oil-water tank.

5. The oily wastewater treatment system according to any one of claims 1-3, characterized in that, The bottom surface of the sewage tank is lower than the bottom surface of the oil-water tank.

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