CN215905904U - Ceramic membrane filter and oily sewage pretreatment device - Google Patents

Abstract

The utility model discloses a ceramic membrane filter and an oily sewage pretreatment device, and relates to the technical field of oily sewage treatment, wherein the ceramic membrane filter comprises a first box body, a second box body and a ceramic membrane group, the first box body is provided with a water inlet and a sewage outlet, the water inlet is arranged on the upper surface of the first box body, and the sewage outlet is arranged on the side wall of the first box body; the second box body is provided with a water outlet which is arranged on the lower surface of the second box body; the ceramic membrane group is arranged between the first box body and the second box body, a ceramic membrane is arranged in the ceramic membrane group, a first inlet and a second inlet are formed in the ceramic membrane group, and the first inlet and the second inlet are communicated with pipelines in the ceramic membrane. The ceramic membrane filter is convenient to clean and has long service life.

Description

Ceramic membrane filter and oily sewage pretreatment device

Technical Field

The utility model relates to the technical field of oily sewage treatment, in particular to a ceramic membrane filter and an oily sewage pretreatment device.

Background

Along with the improvement of environmental protection consciousness of people, the sewage discharge problem, especially oily sewage, is more and more concerned. The oily sewage is mainly from petrochemical, steel, coking and other industrial departments, needs to be recycled and cannot be directly discharged, and the oily sewage pollutes a water body, influences the survival of aquatic organisms, blocks soil gaps and hinders the growth of crops. In the traditional treatment mode, the adopted filter is not easy to clean, so that the service life of the filter is short, the filter needs to be replaced frequently, and the cost is increased; moreover, the treatment difficulty of the oil substances in the oily sewage is high, and the maintenance cost of the treatment device is high, so that the oily sewage needs to be pretreated, such as filtering floating oil, so as to reduce the treatment difficulty and prolong the service life of the treatment device.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the ceramic membrane filter is convenient to clean and long in service life.

The utility model also discloses a pretreatment device of the oily sewage with the ceramic membrane filter.

The ceramic membrane filter comprises a first box body, a second box body and a ceramic membrane group, wherein the first box body is provided with a water inlet and a sewage draining outlet, the water inlet is formed in the upper surface of the first box body, and the sewage draining outlet is formed in the side wall of the first box body; the second box body is provided with a water outlet which is arranged on the lower surface of the second box body; the ceramic membrane group is arranged between the first box body and the second box body, a ceramic membrane is arranged in the ceramic membrane group, a first inlet and a second inlet are formed in the ceramic membrane group, and the first inlet and the second inlet are communicated with pipelines in the ceramic membrane.

The ceramic membrane filter according to the embodiment of the utility model has at least the following beneficial effects: oily sewage can get into the ceramic membrane filter from the water inlet on the first box, after the filtration of ceramic membrane group, flow in the second box, and can get rid of from the delivery port of second box, send into ceramic membrane with clean compressed air through the first access & exit of the pipeline of intercommunication ceramic membrane, thereby sweep ceramic membrane, can discharge impurity, and send into ceramic membrane through the second access & exit of the pipeline of intercommunication ceramic membrane with cleaning reagent, thereby do further washing to ceramic membrane, and then prolong ceramic membrane's life.

According to some embodiments of the utility model, the ceramic membrane module comprises a pressing plate and a bottom plate, the pressing plate is detachably mounted on the bottom plate, the ceramic membrane is arranged on the pressing plate, the bottom plate is provided with an avoidance position adapted to the pressing plate, and the second inlet and the first inlet are arranged on the bottom plate.

According to some embodiments of the utility model, a first placing plate and a second placing plate are disposed on the bottom plate, the first placing plate and the second placing plate are located in the avoidance portion, the first placing plate and the second placing plate respectively correspond to two ends of a pipeline in the ceramic membrane, a first groove communicated with the first inlet and the first outlet is disposed on the first placing plate, the first groove is communicated with a first end of the pipeline in the ceramic membrane, a second groove communicated with the second inlet and the second outlet is disposed on the second placing plate, and the second groove is communicated with a second end of the pipeline in the ceramic membrane.

According to some embodiments of the utility model, the pressure plate comprises a fixing frame and the ceramic diaphragm, the ceramic diaphragm is fixed on the fixing frame, and the fixing frame is detachably connected with the bottom plate.

The oily sewage pretreatment device comprises a plurality of ceramic membrane filters, a floating oil collecting module and an oily sewage tank, wherein the ceramic membrane filters are used as a coarse filter, a first fine filter, a second fine filter and a standing filter respectively; the floating oil collecting module is communicated with a water inlet of the coarse filter; and the sump oil tank is communicated with a drain outlet of the standing filter.

The oily sewage pretreatment device provided by the embodiment of the utility model at least has the following beneficial effects:

the oily sewage in the effluent water sump is carried to the strainer in through the dredge pump to the oil slick collection module, again via first secondary filter, the second secondary filter and the filter that stews carry out further filtration, realize the separation of oil slick and sewage in the oily sewage, accomplish the preliminary treatment to oily sewage, reduce the processing degree of difficulty to oily sewage, and realize the separation of oil slick in the oily sewage through a plurality of ceramic membrane filters, can separate oil slick and sewage effectively, help getting rid of the oil slick in the effluent water sump, facilitate for subsequent oily sewage treatment.

According to some embodiments of the utility model, the floating oil collection module comprises a floating oil collector and a dredge pump, the floating oil collector is connected with the dredge pump, and the dredge pump is communicated with the coarse filter.

According to some embodiments of the utility model, further comprising a reagent cleaning module in communication with the coarse filter, the first fine filter, the second fine filter, and the resting filter, respectively.

According to some embodiments of the utility model, the reagent cleaning module comprises a reagent tank and a reagent pump, the reagent tank is in communication with the reagent pump, and the reagent pump is in communication with the second inlet and outlet of the coarse filter, the second inlet and outlet of the first fine filter, the second inlet and outlet of the second fine filter, and the second inlet and outlet of the standing filter, respectively.

According to some embodiments of the utility model, further comprising an air purge module in communication with the coarse filter, the first fine filter, the second fine filter, and the resting filter, respectively.

According to some embodiments of the utility model, the air purge module comprises an air compressor and an air purifier, the air compressor is connected to the air purifier, and the air purifier is respectively communicated with the first inlet and outlet of the coarse filter, the first inlet and outlet of the first fine filter, the first inlet and outlet of the second fine filter, and the first inlet and outlet of the standing filter.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view of a ceramic membrane filter according to an embodiment of the present invention;

FIG. 2 is a schematic illustration of an explosion of the ceramic membrane filter shown in FIG. 1;

fig. 3 is a schematic view illustrating a pipeline communication of the oily sewage pretreatment device according to an embodiment of the present invention;

fig. 4 is a schematic view illustrating the communication of a cleaning pipeline of the oily sewage pretreatment device according to an embodiment of the present invention;

fig. 5 is a schematic view illustrating the communication of the purge line of the oily wastewater pretreatment device according to an embodiment of the present invention;

fig. 6 is a schematic view of the pipeline communication of the oily sewage pretreatment device according to another embodiment of the present invention.

Reference numerals:

a ceramic membrane filter 100, a first tank 110, a water inlet 111, and a drain outlet 112; a second tank 120, a water outlet 121; a ceramic membrane module 130, a bottom plate 131, a first placing plate 1311, a first groove 1312, a second placing plate 1313, a second groove 1314, a pressure plate 132, a fixing frame 1321, a ceramic membrane 1322, a first inlet/outlet 133, a second inlet/outlet 134, and an escape site 135; a coarse filter 210, a first fine filter 220, a second fine filter 230, a standing filter 240; a floating oil collecting module 300, a floating oil collector 310 and a sewage pump 320; a reagent washing module 400, a reagent tank 410, a reagent pump 420; an air purge module 500, an air compressor 510, an air purifier 520; a sump oil tank 600.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

The utility model is further elucidated with reference to the drawing.

Referring to fig. 1, in some embodiments of the present invention, a ceramic membrane filter 100 includes a first casing 110, a second casing 120, and a ceramic membrane module 130, wherein the ceramic membrane module 130 is disposed between the first casing 110 and the second casing 120, that is, the first casing 110 is mounted on an upper surface of the ceramic membrane module 130, the second casing 120 is mounted on a lower surface of the ceramic membrane module 130, and ceramic membranes 1322 are disposed in the ceramic membrane module 130, it should be noted that the ceramic membranes 1322 may be disposed in a plurality of pieces, and the number of the ceramic membranes 1322 may be increased or decreased according to a requirement of a filtering effect, and the plurality of ceramic membranes 1322 may be disposed longitudinally in a stacked manner; the interior of ceramic membrane 1322 is hollow, forming one or more conduits.

The first casing 110 is provided with a water inlet 111 and a drain outlet 112, the water inlet 111 is disposed on the upper surface of the first casing 110, the drain outlet 112 is disposed on the sidewall of the first casing 110, the water inlet 111 is used for receiving oily sewage, and the drain outlet 112 is used for discharging oil substances such as floating oil and the like remaining in the first casing 110 after being filtered by the ceramic membrane module 130. It is contemplated that a pipe may be further provided at the water inlet 111 and the soil discharge outlet 112 to connect pipes for transporting oily sewage.

The second tank 120 is provided with a water outlet 121, the water outlet 121 is located on the lower surface of the second tank 120, and the water outlet 121 is used for discharging filtered sewage. It can be understood that the oily sewage flows in from the water inlet 111 of the first tank 110, the floating oil flows out from the sewage discharge outlet 112 of the first tank 110 by the filtration of the ceramic membrane group 130, and the oily sewage flowing into the second tank 120 through the ceramic membrane group 130 flows out from the water outlet 121. The water inlet 111 is disposed on the upper surface of the first tank 110, and the water outlet 121 is disposed on the lower surface of the second tank 120, so that the oily sewage can flow in the ceramic membrane filter 100 under the action of gravity, thereby facilitating filtration.

The ceramic membrane module 130 is further provided with a first inlet/outlet 133 and a second inlet/outlet 134, and the first inlet/outlet 133 and the second inlet/outlet 134 are both communicated with the pipeline inside the ceramic membrane 1322, the first inlet/outlet 133 is used for receiving a high-pressure gas flow, and the second inlet/outlet 134 is used for receiving a cleaning reagent, it is contemplated that the first inlet/outlet 133 may also receive a cleaning reagent, and the second inlet/outlet 134 may also receive a high-pressure gas. It is understood that the high pressure gas flow flows into the ceramic membrane module 130 through the first port 133 and flows out through the second port 134, thereby purging the ceramic membrane 1322 to remove impurities, oil, etc. clogged in the ceramic membrane 1322 during the filtration process; the cleaning reagent enters the ceramic membrane module 130 through the second inlet/outlet 134 and can flow out through the first inlet/outlet 133, thereby cleaning the ceramic membrane 1322. The first port 133 and the second port 134 may communicate with a pipe in the ceramic membrane 1322 by way of a pipe communication.

Furthermore, by providing the first inlet/outlet 133 and the second inlet/outlet 134, the ceramic membrane 1322 can be cleaned without disassembling the ceramic membrane filter 100, thereby removing impurities, oil stains, and the like on the ceramic membrane 1322, recovering the filtering capability, further prolonging the service life of the ceramic membrane filter 100, and facilitating cleaning of the ceramic membrane 1322.

Referring to fig. 2, in some embodiments of the present invention, the ceramic membrane module 130 includes a pressing plate 132 and a bottom plate 131, the pressing plate 132 is detachably mounted on the bottom plate 131, and the bottom plate 131 is provided with a relief position 135 adapted to the pressing plate 132, it can be understood that an area that can penetrate through the bottom plate 131, i.e., the relief position 135, is formed on the bottom plate 131, the pressing plate 132 is mounted in the relief position 135, and the ceramic membrane 1322 is disposed in the pressing plate 132, so that the filtered oily sewage can flow into the second tank 120 after passing through the pressing plate 132. The second inlet/outlet 134 and the first inlet/outlet 133 are both disposed on the bottom plate 131, for example, the second inlet/outlet 134 and the first inlet/outlet 133 may be disposed on a side wall of the bottom plate 131, and two through holes are opened on the side wall of the bottom plate 131 as the second inlet/outlet 134 and the first inlet/outlet 133, and the two through holes are respectively communicated with the pipes in the ceramic membrane 1322, thereby forming a passage for cleaning and purging.

Referring to fig. 2, in some embodiments of the present invention, a first placing plate 1311 and a second placing plate 1313 are disposed on the bottom plate 131, the first placing plate 1311 and the second placing plate 1313 are disposed in the escape position 135, and the first placing plate 1311 and the second placing plate 1313 correspond to both ends of the pipe in the ceramic membrane 1322, respectively, it is understood that the ceramic membrane 1322 is disposed in the left-right direction, and the pipe therein is also disposed in the left-right direction, and the first placing plate 1311 and the second placing plate 1313 correspond to both ends of the pipe, that is, the first placing plate 1311 and the second placing plate 1313 are also disposed in the left-right direction.

The first mounting plate 1311 is provided with a first groove 1312, the first groove 1312 communicating with the first port 133, and the first groove 1312 further communicating with the first end of the pipe in the ceramic membrane 1322, and it is understood that the high-pressure gas enters the first port 133, flows through the first groove 1312, and finally enters the pipe in the ceramic membrane 1322. Similarly, the second placing plate 1313 is provided with a second recess 1314, the second recess 1314 is communicated with the second inlet/outlet 134, and the second recess 1314 is also communicated with the second end of the channel in the ceramic membrane 1322, it being understood that the washing reagent enters the second inlet/outlet 134, flows through the second recess 1314, and finally enters the channel in the ceramic membrane 1322.

The pressing plate 132 is placed on the first placing plate 1311 and the second placing plate 1313 so that the ceramic membrane sheet 1322 can correspond to the first recesses 1312 on the first placing plate 1311 and the second recesses 1314 on the second placing plate 1313, facilitating cleaning of the ceramic membrane sheet 1322.

Referring to fig. 2, in some embodiments of the present invention, the pressure plate 132 includes a fixing frame 1321 and a ceramic membrane 1322, the ceramic membrane 1322 is fixed on the fixing frame 1321, and the fixing frame 1321 is detachably connected to the bottom plate 131, for example, threaded holes are respectively formed at corresponding positions on the fixing frame 1321 and the bottom plate 131, the pressure plate 132 is placed on the bottom plate 131, the threaded holes on the fixing frame 1321 can correspond to the threaded holes on the bottom plate 131, and the fixing frame 1321 is fixed on the bottom plate 131 by bolts or screws; alternatively, the fixing plate can be detachably connected to the bottom plate 131 by means of a snap.

Referring to fig. 3, in some embodiments of the present invention, there is also provided a oily wastewater pretreatment apparatus including a floating oil collecting module 300, a dirty oil tank 600, and a plurality of ceramic membrane filters 100, wherein the plurality of ceramic membrane filters 100 are used as a coarse filter 210, a first fine filter 220, a second fine filter 230, and a still filter 240, respectively. The floating oil collecting module 300 is placed in a sewage pool for storing oily sewage, and collects the oily sewage with floating oil and transmits the oily sewage to the coarse filter 210, the sewage outlet of the first fine filter 220 and the sewage outlet of the second fine filter 230 are communicated with the water inlet of the standing filter 240, namely, the oily sewage is filtered by the coarse filter 210, the first fine filter 220 and the second fine filter 230 respectively, the filtered dirty oil flows out from respective sewage outlets and enters the standing filter 240 for filtering, and finally flows out from the sewage outlet of the standing filter 240 communicated with the dirty oil tank 600 and enters the dirty oil tank 600. And the water outlet of the coarse filter 210 is respectively communicated with the water inlet of the first fine filter 220 and the water inlet of the second fine filter 230, it can be understood that after the primary filtration by the coarse filter 210, the oily sewage is respectively sent to the first fine filter 220 and the second fine filter 230 for fine filtration. In addition, the water outlets of the first fine filter 220, the second fine filter 230 and the standing filter 240 are all communicated with a sewage pool, and the oily sewage filtered by the first fine filter 220, the second fine filter 230 and the standing filter 240 flows into the sewage pool again to realize circulation, so that the floating oil in the oily sewage can be continuously removed, the pretreatment effect is achieved, and the treatment difficulty of the oily sewage is reduced.

In some embodiments of the present invention, the floating oil collecting module 300 comprises a floating oil collector 310 and a sewage pump 320, the floating oil collector 310 floats on the surface of the oily sewage for collecting the floating oil, the sewage pump 320 is connected to the floating oil collector 310, the sewage pump 320 is further communicated with the water inlet of the coarse filter 210, and the sewage pump 320 transmits the collected oily sewage with the floating oil to the coarse filter 210 for filtering.

It should be noted that the sewage pump 320 may be a submersible sewage pump and a dry sewage pump. Further, the sewage pump 320 is a QW type submersible sewage pump.

Referring to fig. 4, in some embodiments of the present invention, a reagent washing mechanism is further included, a reagent washing module 400 is in communication with the coarse filter 210, the first fine filter 220, the second fine filter 230, and the standing filter 240, respectively, and the reagent washing module 400 is used for cleaning the coarse filter 210, the first fine filter 220, the second fine filter 230, and the standing filter 240. It should be noted that the reagent cleaning module 400 may be a high-pressure water gun, and the high-pressure water gun is connected to the second inlet and outlet, and feeds the cleaning reagent into the second inlet and outlet to complete cleaning. The cleaning agent is a solution for removing oil stains, such as a soda solution or a soda.

Referring to fig. 4, in some embodiments of the present invention, the reagent washing mechanism includes a reagent tank 410 and a reagent pump 420, the reagent tank 410 is communicated with the reagent pump 420, and the reagent pump 420 is respectively connected to the second inlet and outlet of the coarse filter 210, the second inlet and outlet of the first fine filter 220, the second inlet and outlet of the second fine filter 230, and the second inlet and outlet of the standing filter 240, and the washing reagent in the reagent tank 410 can be transferred to the coarse filter 210, the first fine filter 220, the second fine filter 230, and the standing filter 240 through the reagent pump 420, thereby completing the cleaning work of the coarse filter 210, the first fine filter 220, the second fine filter 230, and the standing filter 240. The reagent pump 420 is a pump for transferring the cleaning reagent.

Referring to fig. 5, in some embodiments of the present invention, an air purge module 500 is further included, and the air purge module 500 is in communication with the coarse filter 210, the first fine filter 220, the second fine filter 230, and the resting filter 240, respectively. For example, air purge module 500 may employ an inflator to deliver a high pressure gas stream to coarse filter 210, first fine filter 220, second fine filter 230, and standing filter 240 via the inflator to effect purging of impurities, etc. within coarse filter 210, first fine filter 220, second fine filter 230, and standing filter 240.

Referring to fig. 5, in some embodiments of the present invention, the air purge mechanism includes an air compressor 510 and an air purifier 520, the air compressor 510 is connected to the air purifier 520, the air purifier 520 is respectively connected to the first inlet and outlet of the coarse filter 210, the first inlet and outlet of the first fine filter 220, the first inlet and outlet of the second fine filter 230, and the first inlet and outlet of the standing filter 240, that is, the air purifier 520 purifies the high-pressure air flow output by the air compressor 510 and then respectively sends the high-pressure air flow into the coarse filter 210, the first fine filter 220, the second fine filter 230, and the standing filter 240 to purge impurities and the like thereon.

Referring to fig. 6, in an embodiment of the present invention, the communication between the devices in the oily sewage pretreatment device is controlled by valves, that is, valves are arranged on the pipes for communication between the devices, for example, a valve V1 is arranged between the sewage pump 320 and the coarse filter 210. The operation flow of the oily sewage pretreatment device comprises the following steps:

opening a valve V1 and a valve V3, introducing the oily sewage into the coarse filter 210 and the first fine filter 220, opening a valve V2 after the cavity of the coarse filter 210 is filled with dirty oil, and introducing the dirty oil into the standing filter 240; when the cavity of the first fine filter 220 is full of dirty oil, closing the valve V3, opening the valve V4, introducing the primary filtrate in the coarse filter 210 into the second fine filter 230, and opening the valve V15 to introduce the dirty oil in the first fine filter 220 into the standing filter 240; the cavity of the second fine filter 230 is filled with dirty oil, the valve V4 is closed, and the valve V16 is opened to introduce the dirty oil into the fine filter.

In the process of purging the device, the air compressor 510 is started, the valve V10 is opened, the first fine filter 220 is purged by clean compressed air, and impurities are discharged; after the cavity of the standing filter 240 is filled with dirty oil, opening the valve V14 to discharge the dirty oil into the dirty oil tank 600, opening the valve V11, and purging the ceramic membrane cached in the standing filter 240; before the device is used for shift change or shutdown, the valve V1 is closed, the valve V12 is opened, and the coarse filter 210 is purged by clean compressed air.

In the process of cleaning the device, the valve V5 is opened, and the valve V6, the valve V7, the valve V8 and the valve V13 are opened in sequence for cleaning.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (10)

1. A ceramic membrane filter, comprising:

the first box body is provided with a water inlet and a sewage draining outlet, the water inlet is arranged on the upper surface of the first box body, and the sewage draining outlet is arranged on the side wall of the first box body;

the second box body is provided with a water outlet, and the water outlet is arranged on the lower surface of the second box body;

the ceramic membrane group is arranged between the first box body and the second box body, a ceramic membrane is arranged in the ceramic membrane group, a first inlet and a second inlet are formed in the ceramic membrane group, and the first inlet and the second inlet are communicated with pipelines in the ceramic membrane.

2. A ceramic membrane filter as claimed in claim 1, wherein the ceramic membrane module comprises a pressure plate and a bottom plate, the pressure plate is detachably mounted on the bottom plate, the ceramic membrane is disposed on the pressure plate, the bottom plate is provided with an escape position adapted to the pressure plate, and the second inlet and the first inlet and the second outlet are disposed on the bottom plate.

3. A ceramic membrane filter according to claim 2, wherein the bottom plate is provided with a first holding plate and a second holding plate, the first holding plate and the second holding plate are located in the avoiding section, the first holding plate and the second holding plate correspond to two ends of a pipeline in the ceramic membrane respectively, the first holding plate is provided with a first groove communicated with the first inlet and outlet, the first groove is communicated with a first end of the pipeline in the ceramic membrane, the second holding plate is provided with a second groove communicated with the second inlet and outlet, and the second groove is communicated with a second end of the pipeline in the ceramic membrane.

4. A ceramic membrane filter as claimed in claim 2 or 3, wherein the pressure plate comprises a fixed frame and the ceramic membrane, the ceramic membrane being fixed to the fixed frame, the fixed frame being detachably connected to the base plate.

5. A pretreatment device for oily sewage, which is characterized by comprising a plurality of ceramic membrane filters as claimed in any one of claims 1 to 4, wherein the ceramic membrane filters are respectively used as a coarse filter, a first fine filter, a second fine filter and a standing filter, a sewage discharge port of the coarse filter, a sewage discharge port of the first fine filter and a sewage discharge port of the second fine filter are all communicated with a water inlet of the standing filter, and a water outlet of the coarse filter is respectively communicated with a water inlet of the first fine filter and a water inlet of the second fine filter;

the floating oil collecting module is communicated with a water inlet of the coarse filter;

and the sump oil tank is communicated with the drain outlet of the standing filter.

6. The oily sewage pretreatment device of claim 5, wherein the floating oil collection module comprises a floating oil collector and a sewage pump, the floating oil collector is connected with the sewage pump, and the sewage pump is communicated with the water inlet of the coarse filter.

7. The oily sewage pretreatment device of claim 5, further comprising a reagent cleaning module, wherein the reagent cleaning module is respectively communicated with the coarse filter, the first fine filter, the second fine filter and the standing filter.

8. The oily wastewater pretreatment device of claim 7, wherein the reagent cleaning module comprises a reagent tank and a reagent pump, the reagent tank is communicated with the reagent pump, and the reagent pump is respectively communicated with the second inlet and outlet of the coarse filter, the second inlet and outlet of the first fine filter, the second inlet and outlet of the second fine filter and the second inlet and outlet of the standing filter.

9. The oily wastewater pretreatment device according to claim 5 or 7, further comprising an air purge module, wherein the air purge module is respectively communicated with the coarse filter, the first fine filter, the second fine filter and the standing filter.

10. The oily wastewater pretreatment device of claim 9, wherein the air purge module comprises an air compressor and an air purifier, the air compressor is connected with the air purifier, and the air purifier is respectively communicated with the first inlet and outlet of the coarse filter, the first inlet and outlet of the first fine filter, the first inlet and outlet of the second fine filter and the first inlet and outlet of the standing filter.

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