Oil-containing heavy metal industrial wastewater treatment system and treatment process thereof

Abstract

The invention provides an oil-containing heavy metal industrial wastewater treatment system and a treatment process thereof, and relates to the technical field of industrial wastewater treatment. The oil-containing heavy metal industrial wastewater treatment system comprises a mounting workbench, two supporting and fixing frames are fixedly connected to the upper surface of the mounting workbench, and a cold and heat treatment tank is fixedly connected between the two supporting and fixing frames. A fourth mounting pump body is opened, hot water is pumped into a fifth mounting pipeline by the fourth mounting pump body through a fourth mounting pipeline, and then enters a first treatment area and a second treatment area through two sixth mounting pipelines, so that a spiral buffer pipe is greatly heated, and solidified waste oil in the spiral buffer pipe is melted after being heated; at the moment, a second valve on the wastewater discharge pipe is closed, a third valve on the oil discharge pipeline is opened, and molten waste oil is discharged, so that oil stains in the wastewater can be effectively removed, and normal operation of subsequent equipment is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial wastewater treatment, in particular to an oil-containing heavy metal industrial wastewater treatment system and a treatment process thereof. BACKGROUND

[0002] Industrial oil-containing wastewater has a wide source, including oil-containing wastewater from oil refineries of the petroleum industry, oil-containing wastewater from oil tank washing of railway maintenance sections, rolling steel wastewater and metal cleaning liquid, oil-containing wastewater from oil tankers of ship scrapping plants, oil tanker ballast water, tank washing water, emulsified oil wastewater from mechanical cutting processing, and oil-containing wastewater from catering industry, food processing industry and car washing industry. Oil stains form an oil film on the surface of wastewater, causing water to be oxygen-deficient, resulting in the death of aquatic organisms and the destruction of the self-cleaning function of the water body. The coalesced oil on the surface of the water body also poses a safety risk of possible combustion. According to the source of industrial oil-containing wastewater and the existence form of oil in water, it can be divided into four categories: floating oil, dispersed oil, emulsified oil and dissolved oil.

[0003] After the industrial wastewater is filtered, it will enter the next step of treatment. However, at this time, the industrial wastewater contains a large amount of oil stains. If the oil stains in the industrial wastewater are not removed, a large amount of oil stains will be attached to the subsequent treatment equipment, which requires frequent cleaning of the equipment, consuming time and effort. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides an oil-containing heavy metal industrial wastewater treatment system and a treatment process thereof, which solves the problem that if the oil stains in the industrial wastewater are not removed, a large amount of oil stains will be attached to the subsequent treatment equipment, which requires frequent cleaning of the equipment, consuming time and effort.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an oil-containing heavy metal industrial wastewater treatment system, comprising an installation workbench, wherein two supporting and fixing frames are fixedly connected to the upper surface of the installation workbench, a hot and cold treatment tank body is fixedly connected between the two supporting and fixing frames, two built-in isolation plates are fixedly connected to the interior of the hot and cold treatment tank body, and the opposite sides of the two built-in isolation plates are respectively set as a first treatment area and a second treatment area, a spiral buffer tube is provided inside the first treatment area and the second treatment area, a plurality of filter screens are fixedly connected to the interior of the spiral buffer tube, a wastewater inlet pipe is fixedly connected to the top of the spiral buffer tube, the wastewater inlet pipe passes through the top of the hot and cold treatment tank body and is fixedly connected thereto, a wastewater discharge pipe is fixedly connected to the bottom of the hot and cold treatment tank body and is fixedly connected thereto, a wastewater supply assembly is provided on the front side of the hot and cold treatment tank body, and a wastewater discharge assembly is provided on the rear side of the hot and cold treatment tank body, an ice water supply assembly is installed on one side of the upper surface of the installation workbench, and a hot water supply assembly is installed on the other side of the upper surface of the installation workbench.

[0006] Preferably, the wastewater supply assembly includes a first mounting pump body fixedly connected to the upper surface of the mounting workbench, the outlet of the first mounting pump body is fixedly connected to a first connecting pipe, the end of the first connecting pipe away from the first mounting pump body is fixedly connected to a second connecting pipe, the second connecting pipe is fixedly connected to two wastewater inlet pipes, and a first valve is installed on both of the wastewater inlet pipes.

[0007] Preferably, the wastewater discharge assembly includes a second mounting pump body fixedly connected to the upper surface of the mounting workbench, the inlet of the second mounting pump body is fixedly connected to a third connecting pipe, the end of the third connecting pipe away from the second mounting pump body is fixedly connected to a fourth connecting pipe, the fourth connecting pipe is fixedly connected to two wastewater discharge pipes, and a second valve is installed on both of the wastewater discharge pipes.

[0008] Preferably, outer surfaces of the two wastewater discharge pipes are fixedly connected to oil discharge pipes, and a third valve is installed on the oil discharge pipes.

[0009] Preferably, the ice water supply assembly includes an ice water tank body fixedly connected to the upper surface of the installation workbench, the outlet of the ice water tank body is fixedly connected to a third installation pump body, the outlet of the third installation pump body is fixedly connected to a first installation pipe, the end of the first installation pipe away from the ice water tank body is fixedly connected to a second installation pipe, the lower surface of the second installation pipe is fixedly connected to two third installation pipes, the two third installation pipes are both fixedly connected to the top of the cold and hot treatment tank body, and the two third installation pipes correspond to the first treatment area and the second treatment area respectively, and a fourth valve is installed on the third installation pipe.

[0010] Preferably, the hot water supply assembly comprises a hot water tank body fixedly connected to the top surface of the installation workbench, a fourth installation pump body fixedly connected to the outlet of the hot water tank body, a fourth installation pipeline fixedly connected to the outlet of the fourth installation pump body, a fifth installation pipeline fixedly connected to one end of the fourth installation pipeline away from the fourth installation pump body, two sixth installation pipelines fixedly connected to one side of the fifth installation pipeline, the two sixth installation pipelines corresponding to the first treatment area and the second treatment area respectively, and a fifth valve installed on the sixth installation pipeline.

[0011] Preferably, the first treatment area and the second treatment area are both provided with a hot water discharge pipeline and a cold water discharge pipeline, the hot water discharge pipeline and the cold water discharge pipeline are both fixedly connected to the cold and hot treatment tank body, and the hot water discharge pipeline and the cold water discharge pipeline are both provided with a sixth valve.

[0012] A treatment process of an oil-containing heavy metal industrial wastewater treatment system, the treatment process comprising the following contents:

[0013] 1) The inlet of the first installation pump body is connected to the wastewater pipeline, the filtered wastewater enters the second connection pipeline through the first connection pipeline, and then enters the corresponding spiral buffer pipeline through the two wastewater inlet pipelines, before which the third installation pump body is started to draw the ice water in the ice water tank into the second installation pipeline, and then into the first treatment area and the second treatment area through the two third installation pipelines, so that the spiral buffer pipeline is greatly cooled, and the wastewater in the spiral buffer pipeline is cooled, the waste oil is solidified under the influence of low temperature, and the filtered wastewater enters the wastewater discharge pipeline and is drawn away by the second installation pump body;

[0014] 2) After a period of treatment, the first installation pump body is closed, the wastewater supply is stopped, the sixth valve on the cold water discharge pipeline is opened, the cold water in the first treatment area and the second treatment area is discharged, then the sixth valve is closed, the fourth installation pump body is opened, the fourth installation pump body draws hot water into the fifth installation pipeline through the fourth installation pipeline, and then into the first treatment area and the second treatment area through the two sixth installation pipelines, so that the spiral buffer pipeline is greatly heated, the solidified waste oil in the spiral buffer pipeline is melted, at this time the second valve on the wastewater discharge pipeline is closed and the third valve on the oil discharge pipeline is opened, and the melted waste oil is discharged;

[0015] 3) When there is a large amount of waste oil in the spiral buffer tube in the first treatment area and a small amount of waste oil in the spiral buffer tube in the second treatment area, close the first valve on the wastewater inlet pipe in the first treatment area to prevent wastewater from entering the spiral buffer tube in the first treatment area, then drain the cold water in the first treatment area, open the fifth valve on the sixth installation pipe in the first treatment area, and open the fourth installation pump body to allow hot water to enter the first treatment area to heat the spiral buffer tube. At the same time, close the second valve on the wastewater discharge pipe in the first treatment area, open the third valve on the oil discharge pipe in the first treatment area, and drain the melted waste oil.

[0016] 4) When there is less waste oil in the spiral buffer tube in the first treatment area and more waste oil in the spiral buffer tube in the second treatment area, the same operation is performed.

[0017] The present invention provides a system and process for treating industrial wastewater containing oil and heavy metals. It has the following beneficial effects:

[0018] 1. The present invention closes the first installation pump body, stops the wastewater supply, opens the sixth valve on the cold water discharge pipe, discharges the cold water in the first treatment area and the second treatment area, then closes the sixth valve, opens the fourth installation pump body, and the fourth installation pump body pumps hot water into the fifth installation pipe through the fourth installation pipe, and then enters the first treatment area and the second treatment area through the two sixth installation pipes, so that the spiral buffer tube is greatly heated, and the solidified waste oil inside the spiral buffer tube is melted after being heated. At this time, the second valve on the wastewater discharge pipe is closed, and the third valve on the oil discharge pipe is opened to discharge the melted waste oil, which can effectively remove oil stains in the wastewater and ensure the normal operation of subsequent equipment.

[0019] 2. According to the present invention, when there is more waste oil in the spiral buffer tube in the first treatment area and less waste oil in the spiral buffer tube in the second treatment area, the first valve on the wastewater inlet pipe in the first treatment area is closed to prevent wastewater from entering the spiral buffer tube in the first treatment area. Then, the cold water in the first treatment area is discharged, and then the fifth valve on the sixth installation pipe in the first treatment area is opened, and the fourth installation pump body is opened to allow hot water to enter the first treatment area to heat the spiral buffer tube. At the same time, the second valve on the wastewater discharge pipe in the first treatment area is closed, and the third valve on the oil discharge pipe in the first treatment area is opened to discharge the melted waste oil. By switching the first treatment area and the second treatment area, normal oil removal can also be performed without stopping the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the first-perspective three-dimensional structure of an oil-containing heavy metal industrial wastewater treatment system provided by the present invention;

[0021] Figure 2A second perspective three-dimensional structural schematic view of an oil-containing heavy metal industrial wastewater treatment system according to the present application is provided;

[0022] Figure 3 A cold and hot treatment tank body internal schematic view of an oil-containing heavy metal industrial wastewater treatment system according to the present application is provided;

[0023] Figure 4 A spiral buffer pipe structure schematic view of an oil-containing heavy metal industrial wastewater treatment system according to the present application is provided;

[0024] Figure 5 A filter screen installation schematic view of an oil-containing heavy metal industrial wastewater treatment system according to the present application is provided;

[0025] Figure 6 A Figure 2 schematic view of structure at A of an oil-containing heavy metal industrial wastewater treatment system according to the present application is provided.

[0026] 1, installation workbench; 2, support fixing frame; 3, cold and hot treatment tank body; 4, built-in isolation plate; 5, first treatment area; 6, second treatment area; 7, wastewater inlet pipe; 8, wastewater outlet pipe; 9, spiral buffer pipe; 10, first installation pump body; 11, first connecting pipeline; 12, second connecting pipeline; 13, second installation pump body; 14, third connecting pipeline; 15, fourth connecting pipeline; 16, oil discharge pipeline; 17, ice water tank body; 18, first installation pipeline; 19, second installation pipeline; 20, third installation pipeline; 21, hot water tank body; 22, fourth installation pipeline; 23, fifth installation pipeline; 24, sixth installation pipeline; 25, filter screen. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0028] As Figures 1-6As shown, an embodiment of the present invention provides an oil-containing heavy metal industrial wastewater treatment system, including an installation workbench 1, two supporting fixing frames 2 are fixedly connected to the upper surface of the installation workbench 1, a cold and hot treatment tank body 3 is fixedly connected between the two supporting fixing frames 2, two built-in isolation plates 4 are fixedly connected to the interior of the cold and hot treatment tank body 3, and the opposite sides of the two built-in isolation plates 4 are respectively set as a first treatment area 5 and a second treatment area 6, a spiral buffer tube 9 is provided inside the first treatment area 5 and the second treatment area 6, a plurality of filter screens 25 are fixedly connected to the interior of the spiral buffer tube 9, a wastewater inlet pipe 7 is fixedly connected to the top of the spiral buffer tube 9, the wastewater inlet pipe 7 passes through the top of the cold and hot treatment tank body 3 and is fixedly connected thereto, and a wastewater discharge pipe is fixedly connected to the bottom end of the spiral buffer tube 9 8. The wastewater discharge pipe 8 passes through the bottom of the hot and cold treatment tank body 3 and is fixedly connected thereto. A wastewater supply assembly is provided on the front side of the hot and cold treatment tank body 3. The wastewater supply assembly includes a first installation pump body 10 fixedly connected to the upper surface of the installation workbench 1. The outlet of the first installation pump body 10 is fixedly connected to a first connecting pipe 11. The end of the first connecting pipe 11 away from the first installation pump body 10 is fixedly connected to a second connecting pipe 12. The second connecting pipe 12 is fixedly connected to the two wastewater inlet pipes 7. A first valve is installed on both wastewater inlet pipes 7. The first treatment area 5 and the second treatment area 6 are both provided with a hot water discharge pipe and a cold water discharge pipe. The hot water discharge pipe and the cold water discharge pipe are both fixedly connected to the hot and cold treatment tank body 3, and a sixth valve is installed on the hot water discharge pipe and the cold water discharge pipe.

[0029] A wastewater discharge assembly is provided on the rear side of the cold and hot treatment tank body 3, and the wastewater discharge assembly includes a second mounting pump body 13 fixedly connected to the upper surface of the mounting workbench 1, and the inlet of the second mounting pump body 13 is fixedly connected to a third connecting pipe 14, and the end of the third connecting pipe 14 away from the second mounting pump body 13 is fixedly connected to a fourth connecting pipe 15, and the fourth connecting pipe 15 is fixedly connected to the two wastewater discharge pipes 8, and the two wastewater discharge pipes 8 are both installed with a second valve, and the outer surfaces of the two wastewater discharge pipes 8 are fixedly connected with an oil discharge pipe 16, and the oil discharge pipe 16 is installed with a third valve.

[0030] An ice water supply assembly is installed on one side of the upper surface of the installation workbench 1, and the ice water supply assembly includes an ice water tank body 17 fixedly connected to the upper surface of the installation workbench 1, and the outlet of the ice water tank body 17 is fixedly connected to the third installation pump body, and the outlet of the third installation pump body is fixedly connected to the first installation pipe 18, and the end of the first installation pipe 18 away from the ice water tank body 17 is fixedly connected to the second installation pipe 19, and the lower surface of the second installation pipe 19 is fixedly connected to two third installation pipes 20, and the two third installation pipes 20 are both fixedly connected to the top of the cold and hot treatment tank body 3, and the two third installation pipes 20 correspond to the first treatment area 5 and the second treatment area 6 respectively, and a fourth valve is installed on the third installation pipe 20.

[0031] A hot water supply assembly is installed on the other side of the upper surface of the installation workbench 1, and the hot water supply assembly includes a hot water tank body 21 fixedly connected to the upper surface of the installation workbench 1, and the outlet of the hot water tank body 21 is fixedly connected to the fourth installation pump body, and the outlet of the fourth installation pump body is fixedly connected to the fourth installation pipe 22, and the end of the fourth installation pipe 22 away from the fourth installation pump body is fixedly connected to the fifth installation pipe 23, and one side of the fifth installation pipe 23 is fixedly connected to two sixth installation pipes 24, and the two sixth installation pipes 24 correspond to the first processing area 5 and the second processing area 6 respectively, and the sixth installation pipe 24 is installed with a fifth valve.

[0032] A treatment process for an oily and heavy metal industrial wastewater treatment system, the treatment process comprising the following:

[0033] 1) The inlet of the first installation pump body 10 is connected to the wastewater pipe. The filtered wastewater enters the second connecting pipe 12 through the first connecting pipe 11, and then enters the corresponding spiral buffer pipe 9 through the two wastewater inlet pipes 7. Before this, the third installation pump body is started. The third installation pump body draws ice water from the ice water tank 17 into the second installation pipe 19, and then enters the first treatment area 5 and the second treatment area 6 through the two third installation pipes 20, so that the spiral buffer pipe 9 is greatly cooled. After the wastewater inside the spiral buffer pipe 9 is cooled, the waste oil is solidified by the low temperature and is intercepted by the filter screen 25. The wastewater after oil removal enters the wastewater discharge pipe 8 and is pumped away through the second installation pump body 13;

[0034] 2) After a period of treatment, the first installation pump body 10 is closed to stop the wastewater supply, and the sixth valve on the cold water discharge pipe is opened to discharge the cold water in the first treatment area 5 and the second treatment area 6. Then, the sixth valve is closed and the fourth installation pump body is opened. The fourth installation pump body pumps hot water into the fifth installation pipe 23 through the fourth installation pipe 22, and then enters the first treatment area 5 and the second treatment area 6 through the two sixth installation pipes 24, causing the spiral buffer tube 9 to heat up significantly. The solidified waste oil inside the spiral buffer tube 9 melts after being heated. At this time, the second valve on the wastewater discharge pipe 8 is closed, and the third valve on the oil discharge pipe 16 is opened to discharge the melted waste oil;

[0035] 3) When there is more waste oil in the spiral buffer tube 9 in the first treatment area 5 and less waste oil in the spiral buffer tube 9 in the second treatment area 6, close the first valve on the wastewater inlet pipe 7 in the first treatment area 5 to prevent wastewater from entering the spiral buffer tube 9 in the first treatment area 5, then drain the cold water in the first treatment area 5, open the fifth valve on the sixth installation pipe 24 in the first treatment area 5, and open the fourth installation pump body to allow hot water to enter the first treatment area 5 to heat the spiral buffer tube 9. At the same time, close the second valve on the wastewater discharge pipe 8 in the first treatment area 5, and open the third valve on the oil discharge pipe 16 in the first treatment area 5 to drain the melted waste oil;

[0036] 4) When the waste oil in the spiral buffer tube 9 in the first treatment area 5 is relatively small, while the waste oil in the spiral buffer tube 9 in the second treatment area 6 is relatively large, the same operation is performed.

[0037] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the statement "comprising a reference structure" does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A system for treating industrial wastewater containing oil and heavy metals, comprising a mounting workbench (1), characterized in that: The upper surface of the installation workbench (1) is fixedly connected to two supporting and fixing frames (2), a cold and hot treatment tank body (3) is fixedly connected between the two supporting and fixing frames (2), the interior of the cold and hot treatment tank body (3) is fixedly connected to two built-in isolation plates (4), the opposite sides of the two built-in isolation plates (4) are respectively set as the first treatment area (5) and the second treatment area (6), the interior of the first treatment area (5) and the second treatment area (6) are both provided with a spiral buffer tube (9), the interior of the spiral buffer tube (9) is fixedly connected to a plurality of filter screens (25), the top of the spiral buffer tube (9) is fixedly connected to the first treatment area (5) and the second treatment area (6), and the top of the spiral buffer tube (9) is fixedly connected to the first treatment area (5) and the second treatment area (6). The end of the spiral buffer tube (9) is fixedly connected to a wastewater inlet pipe (7), which passes through the top of the cold and hot treatment tank body (3) and is fixedly connected thereto; the bottom end of the spiral buffer tube (9) is fixedly connected to a wastewater discharge pipe (8), which passes through the bottom of the cold and hot treatment tank body (3) and is fixedly connected thereto; a wastewater supply assembly is provided on the front side of the cold and hot treatment tank body (3); a wastewater discharge assembly is provided on the rear side of the cold and hot treatment tank body (3); an ice water supply assembly is provided on one side of the upper surface of the installation workbench (1), and a hot water supply assembly is provided on the other side of the upper surface of the installation workbench (1).

2. The oil-containing heavy metal industrial wastewater treatment system according to claim 1, characterized in that: The wastewater supply assembly comprises a first installation pump body (10) fixedly connected to the upper surface of the installation workbench (1); the outlet of the first installation pump body (10) is fixedly connected to a first connecting pipe (11); one end of the first connecting pipe (11) away from the first installation pump body (10) is fixedly connected to a second connecting pipe (12); the second connecting pipe (12) is fixedly connected to two wastewater inlet pipes (7); and a first valve is installed on both of the wastewater inlet pipes (7).

3. The oil-containing heavy metal industrial wastewater treatment system according to claim 2, characterized in that: The wastewater discharge assembly comprises a second installation pump body (13) fixedly connected to the upper surface of the installation workbench (1); the inlet of the second installation pump body (13) is fixedly connected to a third connecting pipe (14); one end of the third connecting pipe (14) away from the second installation pump body (13) is fixedly connected to a fourth connecting pipe (15); the fourth connecting pipe (15) is fixedly connected to two wastewater discharge pipes (8); and a second valve is installed on both of the wastewater discharge pipes (8).

4. The oil-containing heavy metal industrial wastewater treatment system according to claim 3, characterized in that: The outer surfaces of the two wastewater discharge pipes (8) are both fixedly connected with an oil discharge pipe (16), and a third valve is installed on the oil discharge pipe (16).

5. The oil-containing heavy metal industrial wastewater treatment system according to claim 4, characterized in that: The ice water supply assembly comprises an ice water box (17) fixedly connected to the upper surface of the installation workbench (1), the outlet of the ice water box (17) is fixedly connected to a third installation pump body, the outlet of the third installation pump body is fixedly connected to a first installation pipe (18), the end of the first installation pipe (18) away from the ice water box (17) is fixedly connected to a second installation pipe (19), the lower surface of the second installation pipe (19) is fixedly connected to two third installation pipes (20), the two third installation pipes (20) are fixedly connected to the top of the cold and hot treatment tank (3), and the two third installation pipes (20) correspond to the first treatment area (5) and the second treatment area (6) respectively, and a fourth valve is installed on the third installation pipe (20).

6. The oil-containing heavy metal industrial wastewater treatment system according to claim 5, characterized in that: The hot water supply assembly comprises a hot water tank body (21) fixedly connected to the upper surface of the installation workbench (1); the outlet of the hot water tank body (21) is fixedly connected to a fourth installation pump body; the outlet of the fourth installation pump body is fixedly connected to a fourth installation pipe (22); the end of the fourth installation pipe (22) away from the fourth installation pump body is fixedly connected to a fifth installation pipe (23); one side of the fifth installation pipe (23) is fixedly connected to two sixth installation pipes (24); the two sixth installation pipes (24) correspond to the first processing area (5) and the second processing area (6), respectively; and a fifth valve is installed on the sixth installation pipe (24).

7. The oil-containing heavy metal industrial wastewater treatment system according to claim 6, characterized in that: The first treatment area (5) and the second treatment area (6) are both provided with a hot water discharge pipe and a cold water discharge pipe, and the hot water discharge pipe and the cold water discharge pipe are both fixedly connected to the hot and cold treatment tank body (3), and the hot water discharge pipe and the cold water discharge pipe are both installed with a sixth valve.

8. The treatment process of a system for treating oily and heavy metal industrial wastewater according to claim 7, characterized in that: The treatment process includes the following contents: 1) The inlet of the first installation pump body (10) is connected to the wastewater pipe, and the filtered wastewater enters the second connecting pipe (12) through the first connecting pipe (11), and then enters the corresponding spiral buffer pipe (9) through the two wastewater inlet pipes (7). Before this, the third installation pump body is started, and the third installation pump body draws ice water from the inside of the ice water tank (17) into the second installation pipe (19), and then enters the first treatment area (5) and the second treatment area (6) through the two third installation pipes (20), so that the spiral buffer pipe (9) is greatly cooled. After the wastewater in the spiral buffer pipe (9) is cooled, the waste oil is solidified by the low temperature and is intercepted by the filter screen (25). The wastewater after oil removal enters the wastewater discharge pipe (8) and is pumped away through the second installation pump body (13); 2) After a period of treatment, the first installation pump body (10) is closed to stop the wastewater supply, the sixth valve on the cold water discharge pipe is opened to discharge the cold water in the first treatment area (5) and the second treatment area (6), and then the sixth valve is closed and the fourth installation pump body is opened. The fourth installation pump body pumps hot water into the fifth installation pipe (23) through the fourth installation pipe (22), and then enters the first treatment area (5) and the second treatment area (6) through the two sixth installation pipes (24), so that the spiral buffer pipe (9) is greatly heated, and the solidified waste oil inside the spiral buffer pipe (9) is melted after being heated. At this time, the second valve on the wastewater discharge pipe (8) is closed, and the third valve on the oil discharge pipe (16) is opened to discharge the melted waste oil; 3) When there is more waste oil in the spiral buffer tube (9) in the first treatment area (5) and less waste oil in the spiral buffer tube (9) in the second treatment area (6), close the first valve on the wastewater inlet pipe (7) at the first treatment area (5) so that wastewater no longer enters the spiral buffer tube (9) in the first treatment area (5), then discharge the cold water in the first treatment area (5), open the fifth valve on the sixth installation pipe (24) at the first treatment area (5), open the fourth installation pump body, and allow hot water to enter the first treatment area (5) to heat the spiral buffer tube (9). At the same time, close the second valve on the wastewater discharge pipe (8) at the first treatment area (5), open the third valve on the oil discharge pipe (16) at the first treatment area (5), and discharge the melted waste oil; 4) When the waste oil in the spiral buffer tube (9) in the first treatment zone (5) is relatively small, and the waste oil in the spiral buffer tube (9) in the second treatment zone (6) is relatively large, the same operation is performed.

Images