An oily liquid hazardous waste pretreatment system and method of use

Abstract

This invention discloses a pretreatment system and method for oily liquid hazardous waste, relating to the field of co-treatment technology for oily liquid hazardous waste. The system includes an oily liquid hazardous waste flushing water tank, a chemical tank, a first oil-water-sludge separator tank, a low-level oil tank, and a water-sludge sedimentation tank. The chemical tank holds flocculant. The first oil-water-sludge separator tank is connected to both the oily liquid hazardous waste flushing water tank and the chemical tank. The first oil-water-sludge separator tank allows the oily liquid hazardous waste and flocculant to mix and form oil, water, and sludge stratification. The low-level oil tank is connected to the top of the first oil-water-sludge separator tank. The water-sludge sedimentation tank is connected to the bottom of the first oil-water-sludge separator tank, allowing water and sludge to settle and separate within the sedimentation tank. This effectively reduces the risk of solidification of the liquid oily hazardous waste and improves the system's operational reliability and continuity.

Description

Technical Field

[0001] This invention relates to the field of co-treatment technology for oily liquid hazardous waste, and in particular to a pretreatment system and method for using oily liquid hazardous waste. Background Technology

[0002] In recent years, my country's economy has achieved rapid development. However, while this rapid economic growth has brought enormous economic profits, the amount of industrial hazardous waste generated has also been increasing daily. The generation, collection, transportation, storage, comprehensive utilization, and final disposal of industrial hazardous waste involve significant uncertainties in time and space. Industrial hazardous waste is characterized by its large quantity, diverse types, complex composition, and difficulty in treatment, making its pollution control a major challenge in environmental management and a common problem in urban modernization. How to effectively prevent and control pollution caused by industrial hazardous waste has become an urgent issue to be addressed. Traditional methods for treating industrial hazardous waste involve high-temperature chemical treatment to alter the properties of the substances. However, these traditional methods generate large amounts of fly ash, especially highly toxic brominated dioxins and furans. Summary of the Invention

[0003] The purpose of this invention is to provide a pretreatment system and method for oily liquid hazardous waste, in order to solve the problems existing in the prior art, effectively reduce the solidification risk of liquid oily hazardous waste, and effectively improve the operational reliability and continuity of the system for oily liquid hazardous waste.

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

[0005] This invention provides a pretreatment system for oily liquid hazardous waste, comprising: an oily liquid hazardous waste flushing water tank, a chemical tank, a first oil-water-sludge separator tank, a low-level oil tank, and a water-sludge sedimentation tank. The oily liquid hazardous waste flushing water tank is used to collect and hold the oily liquid hazardous waste. A water supply pipe is installed at the top of the oily liquid hazardous waste flushing water tank, and a water supply valve is installed on the water supply pipe. The chemical tank is used to hold flocculants. The first oil-water-sludge separator tank is connected to and communicates with the oily liquid hazardous waste flushing water tank so that the oily liquid hazardous waste in the oily liquid hazardous waste flushing water tank enters the first oil-water-sludge separator tank. The tank is connected and communicates with the medicine tank so that the flocculant in the medicine tank enters the first oil-water-sludge separator tank. The first oil-water-sludge separator tank enables the oily liquid hazardous waste and the flocculant to mix in the first oil-water-sludge separator tank and form oil, water and sludge stratification. The low-level oil tank is connected and communicates with the top of the first oil-water-sludge separator tank to collect the oil in the first oil-water-sludge separator tank. The water and sludge sedimentation tank is connected and communicates with the bottom of the first oil-water-sludge separator tank to collect the water and sludge in the first oil-water-sludge separator tank, and the water and sludge can be separated by sedimentation in the water and sludge sedimentation tank.

[0006] Preferably, the system further includes a first pipeline, a main outlet valve for the feed pump, an oily liquid hazardous waste feed pump, a second pipeline, and a feed valve for the first oil-water-sludge separator tank. One end of the first pipeline is connected to and communicates with the oily liquid hazardous waste flushing water tank, and the other end is connected to and communicates with the inlet of the oily liquid hazardous waste feed pump. The main outlet valve for the feed pump is located on the first pipeline. One end of the second pipeline is connected to and communicates with the oily liquid hazardous waste feed pump, and the other end is connected to and communicates with the first oil-water-sludge separator tank. The feed valve for the first oil-water-sludge separator tank is located on the second pipeline.

[0007] Preferably, it also includes a water tank heater, a third pipeline, and a feed pump recirculation valve. The water tank heater is located at the bottom of the oily liquid hazardous waste flushing water tank. One end of the third pipeline is connected to and communicates with the outlet of the feed pump, and the other end is connected to and communicates with the inlet of the oily liquid hazardous waste flushing water tank.

[0008] Preferably, it further includes a second oil-water-sludge separator tank, a fourth pipeline, and a second oil-water-sludge separator tank feed valve. One end of the fourth pipeline is connected to and communicates with the outlet of the feed pump, and the other end is connected to and communicates with the second oil-water-sludge separator tank. The second oil-water-sludge separator tank feed valve is located on the third pipeline. The second oil-water-sludge separator tank is connected to and communicates with the chemical tank so that the flocculant in the chemical tank enters the second oil-water-sludge separator tank. The top of the second oil-water-sludge separator tank is connected to and communicates with the low-level oil tank, and the bottom of the second oil-water-sludge separator tank is connected to and communicates with the water and sludge sedimentation tank.

[0009] Preferably, the system further includes a fifteenth pipe, a sixteenth pipe, a seventeenth pipe, an oil outlet valve for a first oil-water-sludge separator tank, an oil outlet valve for a second oil-water-sludge separator tank, and an oily liquid hazardous waste transfer pump. The first oil-water-sludge separator tank further includes a first oily liquid hazardous waste overflow trough, a first agitator motor, and a first centrifugal agitator. The first oily liquid hazardous waste overflow trough is fixedly connected to the top of the inner wall of the first oil-water-sludge separator tank. The first agitator motor is fixedly connected to the top of the first oil-water-sludge separator tank. The first centrifugal agitator is located inside the first oil-water-sludge separator tank and fixedly connected to the output end of the first agitator motor. The second oil-water-sludge separator tank further includes a second oily liquid hazardous waste overflow trough, a second agitator motor, and a second centrifugal agitator. The second oily liquid hazardous waste overflow trough is fixedly connected to the top of the inner wall of the second oil-water-sludge separator tank. The second agitator motor is fixedly connected to the top of the first oil-water-sludge separator tank. The top of the oil-water-sludge separator tank is located on the second oil-water-sludge separator tank. The second centrifugal agitator is installed inside the second oil-water-sludge separator tank and is fixedly connected to the output end of the second agitator motor. One end of the fifteenth pipe is connected to the first oil-water-sludge separator tank and communicates with the bottom of the first oily liquid hazardous waste overflow tank. The other end of the fifteenth pipe is connected to the inlet of the oily liquid hazardous waste transfer pump. The oil outlet valve of the first oil-water-sludge separator tank is installed on the fifteenth pipe. One end of the sixteenth pipe is connected to the second oil-water-sludge separator tank and communicates with the bottom of the second oily liquid hazardous waste overflow tank. The other end of the sixteenth pipe is connected to the inlet of the oily liquid hazardous waste transfer pump. The oil outlet valve of the second oil-water-sludge separator tank is installed on the sixteenth pipe. One end of the seventeenth pipe is connected to the outlet of the oily liquid hazardous waste transfer pump and communicates with the other end of the seventeenth pipe.

[0010] Preferably, it further includes an air compressor, a fifth pipe, a sixth pipe, a backwash valve for the first oil-water-sludge separator tank, and a backwash valve for the second oil-water-sludge separator tank. One end of the fifth pipe is connected to and communicates with the outlet of the air compressor, and the other end is connected to and communicates with the discharge port of the first oil-water-sludge separator tank. The backwash valve for the first oil-water-sludge separator tank is installed on the fifth pipe. One end of the sixth pipe is connected to and communicates with the outlet of the air compressor, and the other end is connected to and communicates with the discharge port of the second oil-water-sludge separator tank. The backwash valve for the second oil-water-sludge separator tank is installed on the sixth pipe.

[0011] Preferably, the system further includes a first slag dewatering tank, a slurry pump, a seventh pipe, an eighth pipe, a feed valve for the first slag dewatering tank, an eleventh pipe, and a first filtered water return valve. One end of the seventh pipe is connected to and communicates with the slag sedimentation tank, and the other end is connected to and communicates with the feed inlet of the slurry pump. One end of the eighth pipe is connected to and communicates with the discharge outlet of the slurry pump, and the other end is connected to and communicates with the first slag dewatering tank. The feed valve for the first slag dewatering tank is located on the eighth pipe. A first annular filter screen is provided on the inner wall of the first slag dewatering tank. One end of the eleventh pipe is connected to and communicates with the inner wall of the first slag dewatering tank, and the other end is connected to and communicates with the inlet of the slag sedimentation tank. The first filtered water return valve is located on the eleventh pipe. A first slag discharge port is provided at the bottom of the first slag dewatering tank, and a first vibrator is provided at the first slag discharge port.

[0012] Preferably, it further includes a second slag dewatering tank, a ninth pipe, a second slag dewatering tank feed valve, a twelfth pipe, and a second filtered water return valve. One end of the ninth pipe is connected to and communicates with the discharge port of the slurry pump, and the other end is connected to and communicates with the second slag dewatering tank. The second slag dewatering tank feed valve is located on the ninth pipe. A second annular filter screen is provided on the inner wall of the second slag dewatering tank. One end of the twelfth pipe is connected to and communicates with the inner wall of the second slag dewatering tank, and the other end is connected to and communicates with the inlet of the slag sedimentation tank. The second filtered water return valve is located on the twelfth pipe. A second slag discharge port is provided at the bottom of the second slag dewatering tank, and a second vibrator is provided at the second slag discharge port.

[0013] Preferably, it also includes a tenth pipe and a sedimentation tank supernatant transfer pump. One end of the tenth pipe is used to connect to the sludge sedimentation tank and communicate with the supernatant in the sludge sedimentation tank. The sedimentation tank supernatant transfer pump is installed on the tenth pipe.

[0014] The present invention also provides a method of using the pretreatment system for oily liquid hazardous waste as described in any of the preceding claims, comprising the following steps:

[0015] Oily liquid hazardous waste is transported to the oily liquid hazardous waste flushing water tank by a transport vehicle. At the same time, flushing water is sent into the oily liquid hazardous waste flushing water tank through the flushing pipe. The oily liquid hazardous waste and flushing water are mixed in the oily liquid hazardous waste flushing water tank. The mixed oily liquid hazardous waste and flushing water enter the first oil-water-sludge separator tank. At the same time, flocculant in the chemical tank enters the first oil-water-sludge separator tank. Under the centrifugal action of the first oil-water-sludge separator tank, the mixture of oily liquid hazardous waste, flushing water and flocculant forms oil, water and sludge stratification from top to bottom. The oily liquid is transported to the low-level oil tank, and the water and sludge mixture flows out of the first oil-water-sludge separator tank and flows into the water and sludge sedimentation tank for sedimentation and separation.

[0016] The present invention achieves the following technical effects compared to the prior art:

[0017] This invention provides a pretreatment system and method for oily liquid hazardous waste. The oily liquid hazardous waste is transported by a truck to the oily liquid hazardous waste flushing water tank, while flushing water is simultaneously introduced into the tank through a flushing pipe. The oily liquid hazardous waste and flushing water are mixed in the tank. The mixed oily liquid hazardous waste and flushing water then enter a first oil-water-sludge separator tank. Simultaneously, flocculant from a chemical tank enters the first oil-water-sludge separator tank. Under centrifugal force, the mixture of oily liquid hazardous waste, flushing water, and flocculant in the first oil-water-sludge separator tank separates into oil, water, and sludge layers from top to bottom. The oily liquid is transported to a lower-level oil tank, while the water-sludge mixture flows out of the first oil-water-sludge separator tank and into a water-sludge sedimentation tank for sedimentation and separation. This effectively reduces the risk of solidification of the liquid oily hazardous waste and significantly improves the operational reliability and continuity of the oily liquid hazardous waste system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the structure of the pretreatment system for oily liquid hazardous waste provided by the present invention;

[0020] In the diagram: 1. Oily liquid hazardous waste transport vehicle; 2. Unloading valve; 3. Water supply valve; 4. Oily liquid hazardous waste flushing water tank; 5. Water tank heater; 6. Oily liquid hazardous waste feed pump; 7. Feed pump recirculation valve; 8. Feed pump outlet main valve; 9. First oil-water-sludge separator tank; 91. Second oily liquid hazardous waste overflow trough; 92. Second agitator motor; 10. First oil-water-sludge separator tank feed valve; 11. Second oil-water-sludge separator tank; 12. Second oil-water-sludge separator tank feed valve; 13. First centrifugal agitator; 14. Second oil-water-sludge separator tank water-sludge gravity flow valve; 15. First oil-water-sludge separator tank water-sludge gravity flow valve; 16. Water-sludge sedimentation tank; 17. Sedimentation tank supernatant transfer pump; 18. Slurry. Pump; 19. First slag dewatering tank; 191. First annular filter screen; 20. Feed valve of the first slag dewatering tank; 21. Second vibrator; 22. First filter water return valve; 23. Second slag discharge port; 24. Second slag dewatering tank; 25. Feed valve of the second slag dewatering tank; 26. Oil outlet valve of the second oil-water-slag separator tank; 27. Oil outlet valve of the first oil-water-slag separator tank; 28. Oily liquid hazardous waste transfer pump; 29. ​​Low-level oil tank; 30. Chemical tank; 31. Dosing pump; 32. Dosing valve of the first oil-water-slag separator tank; 33. Dosing valve of the second oil-water-slag separator tank; 34. Air compressor; 35. Backwash valve of the second oil-water-slag separator tank; 36. Backwash valve of the first oil-water-slag separator tank. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The purpose of this invention is to provide a pretreatment system and method for oily liquid hazardous waste, in order to solve the problems existing in the prior art, effectively reduce the solidification risk of liquid oily hazardous waste, and effectively improve the operational reliability and continuity of the system for oily liquid hazardous waste.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1

[0025] This embodiment provides a pretreatment system for oily liquid hazardous waste, such as Figure 1As shown, the system includes: an oily liquid hazardous waste flushing water tank 4, a chemical tank 30, a first oil-water-sludge separator tank 9, a low-level oil tank 29, and a water-sludge sedimentation tank 16. The oily liquid hazardous waste flushing water tank 4 is used to collect and store oily liquid hazardous waste. A water supply pipe is installed on the top of the oily liquid hazardous waste flushing water tank 4, and a water supply valve 3 is installed on the water supply pipe. The chemical tank 30 is used to store flocculant. The first oil-water-sludge separator tank 9 is connected to and communicates with the oily liquid hazardous waste flushing water tank 4 so that the oily liquid hazardous waste in the oily liquid hazardous waste flushing water tank 4 enters the first oil-water-sludge separator tank 16. An oil-water-sludge separator tank 9 is connected to and communicates with a chemical tank 30 so that the flocculant in the chemical tank 30 enters the first oil-water-sludge separator tank 9. The first oil-water-sludge separator tank 9 can mix oily liquid hazardous waste and flocculant in the first oil-water-sludge separator tank 9 to form oil, water and sludge stratification. A low-level oil tank 29 is connected to and communicates with the top of the first oil-water-sludge separator tank 9 to collect the oil in the first oil-water-sludge separator tank 9. A water and sludge sedimentation tank 16 is connected to and communicates with the bottom of the first oil-water-sludge separator tank 9 to collect the oil. The water and sludge in the first oil-water-sludge separator tank 9 are separated and settled in the water-sludge sedimentation tank 16. The unloading valve 2 is opened, and the oily liquid hazardous waste is sent to the oily liquid hazardous waste flushing water tank 4 via the unloading pipe on the oily liquid hazardous waste transport vehicle 1. Simultaneously, the water supply valve 3 on the flushing pipe is opened to send flushing water into the oily liquid hazardous waste flushing water tank 4. The oily liquid hazardous waste and flushing water mix in the oily liquid hazardous waste flushing water tank 4, and the mixed oily liquid hazardous waste and flushing water then enter the first oil-water-sludge separator. The flocculant in the chemical tank 30 enters the first oil-water-sludge separator tank 9. Under the centrifugal action of the first oil-water-sludge separator tank 9, the mixture of oily liquid hazardous waste, flushing water and flocculant forms oil, water and sludge stratification from top to bottom. The oily liquid is transported to the low-level oil tank 29, and the water and sludge mixture flows out of the first oil-water-sludge separator tank 9 and into the water and sludge sedimentation tank 16 for sedimentation and separation. This effectively reduces the solidification risk of liquid oily hazardous waste and effectively improves the operational reliability and continuity of the oily liquid hazardous waste system.

[0026] In a preferred embodiment, the oily liquid hazardous waste pretreatment system further includes a first pipeline, a feed pump outlet main valve 8, an oily liquid hazardous waste feed pump 6, a second pipeline, and a first oil-water-sludge separator tank inlet valve 10. One end of the first pipeline is connected to and communicates with the oily liquid hazardous waste flushing water tank 4, and the other end is connected to and communicates with the inlet of the oily liquid hazardous waste feed pump 6. The feed pump outlet main valve 8 is located on the first pipeline. One end of the second pipeline is connected to and communicates with the oily liquid hazardous waste feed pump 6, and the other end is connected to and communicates with the first oil-water-sludge separator tank 9. The first oil-water-sludge separator tank inlet valve 10 is located on the second pipeline. The system has a simple structure and is easy to operate.

[0027] In a preferred embodiment, the pretreatment system for oily liquid hazardous waste further includes a water tank heater 5, a third pipeline, and a feed pump recirculation valve 7. The water tank heater 5 is located at the bottom of the oily liquid hazardous waste flushing water tank 4. One end of the third pipeline is connected to the outlet of the feed pump, and the other end is connected to the inlet of the oily liquid hazardous waste flushing water tank 4. The first pipeline, the feed pump, and the third pipeline form a circulation pipeline, which allows the oily liquid hazardous waste and the flushing water to be mixed more evenly. A heater is installed at the bottom of the flushing water tank to maintain the oily liquid hazardous waste flushing water tank 4 at about 80°C.

[0028] In a preferred embodiment, the pretreatment system for oily liquid hazardous waste further includes a second oil-water-sludge separator tank 11, a fourth pipeline, and a second oil-water-sludge separator tank feed valve 12. One end of the fourth pipeline is connected to and communicates with the outlet of the feed pump, and the other end is connected to and communicates with the second oil-water-sludge separator tank 11. The second oil-water-sludge separator tank feed valve 12 is located on a third pipeline. The second oil-water-sludge separator tank 11 is connected to and communicates with a chemical tank 30 so that the flocculant in the chemical tank 30 enters the second oil-water-sludge separator tank 11. The top of the second oil-water-sludge separator tank 11 is connected to and communicates with a low-level oil tank 29, and the bottom of the second oil-water-sludge separator tank 11 is connected to and communicates with a water-sludge sedimentation tank 16. The first oil-water-sludge separator tank 9 and the second oil-water-sludge separator tank 11 serve as backups for each other.

[0029] In a preferred embodiment, the oily liquid hazardous waste pretreatment system further includes an eighteenth pipe, a nineteenth pipe, a twentieth pipe, a dosing pump 31, a dosing valve 32 for the first oil-water-sludge separator tank, and a dosing valve 33 for the second oil-water-sludge separator tank. One end of the eighteenth pipe is connected to and communicates with the chemical tank 30, and the other end is connected to and communicates with the inlet of the dosing pump 31. One end of the nineteenth pipe is connected to and communicates with the dosing pump 31, and the other end is connected to and communicates with the first oil-water-sludge separator tank 9. The dosing valve 32 for the first oil-water-sludge separator tank is located on the nineteenth pipe. One end of the twentieth pipe is connected to and communicates with the outlet of the dosing pump 31, and the other end is connected to and communicates with the second oil-water-sludge separator tank 11. The dosing valve 33 for the second oil-water-sludge separator tank is located on the twentieth pipe.

[0030] In a preferred embodiment, the oily liquid hazardous waste pretreatment system further includes a fifteenth pipe, a sixteenth pipe, a seventeenth pipe, an oil outlet valve 27 for the first oil-water-sludge separator tank, an oil outlet valve 26 for the second oil-water-sludge separator tank, and an oily liquid hazardous waste transfer pump 28. The first oil-water-sludge separator tank 9 also includes a first oily liquid hazardous waste overflow trough, a first agitator motor, and a first centrifugal agitator 13. The first oily liquid hazardous waste overflow trough is fixedly connected to the top of the inner wall of the first oil-water-sludge separator tank 9. The first agitator motor is fixedly connected to the top of the first oil-water-sludge separator tank 9. The first centrifugal agitator 13 is disposed inside the first oil-water-sludge separator tank 9 and fixedly connected to the output end of the first agitator motor. The second oil-water-sludge separator tank 11 also includes a second oily liquid hazardous waste overflow trough 91, a second agitator motor 92, and a second centrifugal agitator. The second oily liquid hazardous waste overflow trough 91 is fixedly connected to the top of the inner wall of the second oil-water-sludge separator tank 11. The second agitator motor 92 is fixedly connected to the top of the second oil-water-sludge separator tank 11. The second centrifugal agitator is installed inside the second oil-water-sludge separator tank 11 and fixedly connected to the output end of the second agitator motor 92. One end of the fifteenth pipe is connected to the first oil-water-sludge separator tank 9 and communicates with the bottom of the first oily liquid hazardous waste overflow tank. The other end of the fifteenth pipe is connected to the inlet of the oily liquid hazardous waste transfer pump 28. The oil outlet valve 27 of the first oil-water-sludge separator tank is installed on the fifteenth pipe. One end of the sixteenth pipe is connected to the second oil-water-sludge separator tank 11 and communicates with the bottom of the second oily liquid hazardous waste overflow tank 91. The other end of the sixteenth pipe is connected to the inlet of the oily liquid hazardous waste transfer pump 28. The oil outlet valve 26 of the second oil-water-sludge separator tank is installed on the sixteenth pipe. One end of the seventeenth pipe is connected to the outlet of the oily liquid hazardous waste transfer pump 28 and communicates with the other end. It is simple in structure and easy to use.

[0031] In a preferred embodiment, the oily liquid hazardous waste pretreatment system further includes an air compressor 34, a fifth pipe, a sixth pipe, a backwash valve 36 for the first oil-water-sludge separator tank, and a backwash valve 35 for the second oil-water-sludge separator tank. One end of the fifth pipe is connected to the outlet of the air compressor 34, and the other end is connected to the discharge port of the first oil-water-sludge separator tank. The backwash valve 36 for the first oil-water-sludge separator tank is located on the fifth pipe. One end of the sixth pipe is connected to the outlet of the air compressor 34, and the other end is connected to the discharge port of the second oil-water-sludge separator tank 11. The backwash valve 35 for the second oil-water-sludge separator tank is located on the sixth pipe. The system has a simple structure and can backwash the first oil-water-sludge separator tank 9 and the second oil-water-sludge separator tank 11.

[0032] In a preferred embodiment, the oily liquid hazardous waste pretreatment system further includes a first sludge dewatering tank 19, a slurry pump 18, a seventh pipe, an eighth pipe, a first sludge dewatering tank feed valve 20, an eleventh pipe, and a first filtered water return valve 22. One end of the seventh pipe is connected to and communicates with the sludge sedimentation tank 16, and the other end is connected to and communicates with the feed inlet of the slurry pump 18. One end of the eighth pipe is connected to and communicates with the discharge outlet of the slurry pump 18, and the other end is connected to and communicates with the first sludge dewatering tank 19. The feed valve 20 is installed on the eighth pipe. The inner wall of the first slag dewatering tank 19 is provided with a first annular filter screen 191. One end of the eleventh pipe is connected to the inner wall of the first slag dewatering tank 19 and the other end is connected to the inlet of the slag sedimentation tank 16. The first filtered water return valve 22 is installed on the eleventh pipe. The bottom of the first slag dewatering tank 19 is provided with a first slag discharge port. A first vibrator is provided at the first slag discharge port. The first vibrator vibrates the solid slag at the first slag discharge port to the transport vehicle and finally sends it to the circulating fluidized bed boiler for use.

[0033] In a preferred embodiment, the oily liquid hazardous waste pretreatment system further includes a second slag dewatering tank 24, a ninth pipe, a second slag dewatering tank feed valve 25, a twelfth pipe, and a second filtered water return valve. One end of the ninth pipe is connected to the outlet of the slurry pump 18, and the other end is connected to the second slag dewatering tank 24. The second slag dewatering tank feed valve 25 is located on the ninth pipe. A second annular filter screen is provided on the inner wall of the second slag dewatering tank 24. One end of the twelfth pipe is connected to the inner wall of the second slag dewatering tank 24, and the other end is connected to the inlet of the slag sedimentation tank 16. The second filtered water return valve is located on the twelfth pipe. A second slag discharge port 23 is provided at the bottom of the second slag dewatering tank 24. A second vibrator 21 is provided at the second slag discharge port 23. The second vibrator 21 vibrates the solid slag at the second slag discharge port 23 to the transport vehicle, and finally sends it to the circulating fluidized bed boiler for use.

[0034] In a preferred embodiment, the oily liquid hazardous waste pretreatment system further includes a tenth pipeline and a sedimentation tank supernatant transfer pump 17. One end of the tenth pipeline is connected to a sludge sedimentation tank 16 and communicates with the supernatant in the sludge sedimentation tank 16. The sedimentation tank supernatant transfer pump 17 is installed on the tenth pipeline. The flushing water in the system is reused, which helps to save water resources.

[0035] In a preferred embodiment, the oily liquid hazardous waste pretreatment system further includes a thirteenth pipeline, a first oil-water-sludge separator tank water-sludge self-flow valve 15, a fourteenth pipeline, and a second oil-water-sludge separator tank water-sludge self-flow valve 14. One end of the thirteenth pipeline is connected to and communicates with the bottom of the first oil-water-sludge separator tank 9. The first oil-water-sludge separator tank water-sludge self-flow valve 15 is installed on the thirteenth pipeline. The fourteenth pipeline is connected to and communicates with the bottom of the second oil-water-sludge separator tank 11. The second oil-water-sludge separator tank water-sludge self-flow valve 14 is installed on the fourteenth pipeline.

[0036] Example 2

[0037] This embodiment also provides a method for using the oily liquid hazardous waste pretreatment system as described in any of the above claims, including the following steps:

[0038] Oily liquid hazardous waste is transported to the oily liquid hazardous waste flushing water tank 4 by a transport vehicle. At the same time, flushing water is also sent into the oily liquid hazardous waste flushing water tank 4 through a water replenishment valve or a sedimentation tank supernatant pump. When the oil-water mixture in the oily liquid hazardous waste flushing water tank 4 reaches a high level, the oily liquid hazardous waste feed pump 6 is started. At this time, the feed pump outlet main valve 8 is closed and the feed pump recirculation valve 7 is opened to ensure that the oil-water mixture is fully mixed in the flushing water tank.

[0039] Furthermore, after the oil-water mixture in the oily liquid hazardous waste flushing water tank 4 is fully mixed, the main outlet valve 8 of the feed pump is opened and the recirculation valve 7 of the feed pump is closed. Assuming that the second oil-water-sludge separator tank 11 is on standby and the first oil-water-sludge separator tank 9 is in use, the feed valve 12 of the second oil-water-sludge separator tank is closed and the feed valve 10 of the first oil-water-sludge separator tank is opened. The oil-water mixture enters the first oil-water-sludge separator tank 9, and flocculant is added through the dosing pump 31 at the same time.

[0040] Furthermore, in the first oil-water-sludge separator tank 9, oil, water, and sludge coexist, and the oil, water, and sludge separate into layers under the action of a centrifugal agitator. The oily liquid, due to its lower density than water, is distributed in the upper layer of the first oil-water-sludge separator tank 9. When the oily liquid level is higher than the first oily liquid hazardous waste overflow tank, the oily liquid overflows into the first oily liquid hazardous waste overflow tank and is then sent to the low-level oil tank 29 by the oily liquid hazardous waste transfer pump 28. The water and sludge, due to their higher density, are distributed in the lower layer of the first oil-water-sludge separator tank 9 and flow by gravity through the first oil-water-sludge separator tank's gravity valve to the water and sludge sedimentation tank 16. A compressed air backwashing device is installed at the water and sludge outlet of the first oil-water-sludge separator tank.

[0041] Furthermore, water and slag coexist in the slag sedimentation tank 16. The supernatant from the sedimentation tank is pumped by the supernatant transfer pump 17 into the oily liquid hazardous waste flushing water tank 4 for reuse. The slag settles at the bottom of the slag sedimentation tank 16 under gravity. The slag-water mixture is pumped by the slurry pump 18 into the first slag dewatering tank 19 and / or the second slag dewatering tank 24. Assuming that the first slag dewatering tank 19 is operating and the second slag dewatering tank 24 is on standby, the feed valve 20 of the first slag dewatering tank is opened, and the feed valve 25 of the second slag dewatering tank is closed.

[0042] Furthermore, the first slag dewatering tank 19 is equipped with a first annular filter screen 191, allowing water to pass through while slag cannot, causing slag to continuously settle and the slag level to rise. Water, on the other hand, is returned to the slag sedimentation tank 16 through the first annular filter screen 191 and the first filtered water return valve 22. Once the slag level in the first slag dewatering tank 19 reaches a certain height, the system switches to operation of the second slag dewatering tank 24. After the slag-water mixture in the first slag dewatering tank 19 continues to separate water for about a week, the first slag discharge port and the first vibrator are opened to release the solid slag into a transport vehicle, which is then ultimately sent to the circulating fluidized bed boiler for use.

[0043] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A pretreatment system for oily liquid hazardous waste, characterized in that: include: An oily liquid hazardous waste rinsing water tank is used to collect and store oily liquid hazardous waste. A water supply pipe is installed on the top of the oily liquid hazardous waste rinsing water tank, and a water supply valve is installed on the water supply pipe. A medicine box, which is used to hold flocculants; The first oil-water-sludge separator tank is connected and communicated with the oily liquid hazardous waste flushing water tank so that the oily liquid hazardous waste in the oily liquid hazardous waste flushing water tank enters the first oil-water-sludge separator tank. The first oil-water-sludge separator tank is connected and communicated with the medicine tank so that the flocculant in the medicine tank enters the first oil-water-sludge separator tank. The first oil-water-sludge separator tank enables the oily liquid hazardous waste and the flocculant to mix in the first oil-water-sludge separator tank and form oil, water and sludge stratification. A low-level oil tank is connected to and communicates with the top of the first oil-water-sludge separator tank to collect oil from the first oil-water-sludge separator tank. as well as A water-sludge sedimentation tank is connected and communicates with the bottom of the first oil-water-sludge separator tank to collect water and sludge from the first oil-water-sludge separator tank, and the water and sludge can be separated by sedimentation in the water-sludge sedimentation tank. It also includes a first pipeline, a main outlet valve of the feed pump, an oily liquid hazardous waste feed pump, a second pipeline, and a feed valve for the first oil-water-sludge separator tank. One end of the first pipeline is connected to and communicates with the oily liquid hazardous waste flushing water tank, and the other end is connected to and communicates with the inlet of the oily liquid hazardous waste feed pump. The main outlet valve of the feed pump is located on the first pipeline. One end of the second pipeline is connected to and communicates with the oily liquid hazardous waste feed pump, and the other end is connected to and communicates with the first oil-water-sludge separator tank. The feed valve for the first oil-water-sludge separator tank is located on the second pipeline. It also includes a water tank heater, a third pipeline and a feed pump recirculation valve. The water tank heater is located at the bottom of the oily liquid hazardous waste flushing water tank. One end of the third pipeline is connected to the outlet of the feed pump and the other end is connected to the inlet of the oily liquid hazardous waste flushing water tank. It also includes a first slag dewatering tank, a slurry pump, a seventh pipe, an eighth pipe, a feed valve for the first slag dewatering tank, an eleventh pipe, and a first filtered water return valve. One end of the seventh pipe is connected to and communicates with the slag sedimentation tank, and the other end is connected to and communicates with the feed inlet of the slurry pump. One end of the eighth pipe is connected to and communicates with the discharge outlet of the slurry pump, and the other end is connected to and communicates with the first slag dewatering tank. The feed valve for the first slag dewatering tank is located on the eighth pipe. A first annular filter screen is provided on the inner wall of the first slag dewatering tank. One end of the eleventh pipe is connected to and communicates with the inner wall of the first slag dewatering tank, and the other end is connected to and communicates with the inlet of the slag sedimentation tank. The first filtered water return valve is located on the eleventh pipe. A first slag discharge port is provided at the bottom of the first slag dewatering tank, and a first vibrator is provided at the first slag discharge port.

2. The pretreatment system for oily liquid hazardous waste according to claim 1, characterized in that: It also includes a second oil-water-sludge separator tank, a fourth pipeline, and a second oil-water-sludge separator tank feed valve. One end of the fourth pipeline is connected to and communicates with the outlet of the feed pump, and the other end is connected to and communicates with the second oil-water-sludge separator tank. The second oil-water-sludge separator tank feed valve is located on the third pipeline. The second oil-water-sludge separator tank is connected to and communicates with the medicine tank so that the flocculant in the medicine tank enters the second oil-water-sludge separator tank. The top of the second oil-water-sludge separator tank is connected to and communicates with the low-level oil tank, and the bottom of the second oil-water-sludge separator tank is connected to and communicates with the water and sludge sedimentation tank.

3. The pretreatment system for oily liquid hazardous waste according to claim 2, characterized in that: It also includes a fifteenth pipe, a sixteenth pipe, a seventeenth pipe, an oil outlet valve for a first oil-water-sludge separator tank, an oil outlet valve for a second oil-water-sludge separator tank, and an oily liquid hazardous waste transfer pump. The first oil-water-sludge separator tank further includes a first oily liquid hazardous waste overflow trough, a first agitator motor, and a first centrifugal agitator. The first oily liquid hazardous waste overflow trough is fixedly connected to the top of the inner wall of the first oil-water-sludge separator tank. The first agitator motor is fixedly connected to the top of the first oil-water-sludge separator tank. The first centrifugal agitator is located inside the first oil-water-sludge separator tank and fixedly connected to the output end of the first agitator motor. The second oil-water-sludge separator tank further includes a second oily liquid hazardous waste overflow trough, a second agitator motor, and a second centrifugal agitator. The second oily liquid hazardous waste overflow trough is fixedly connected to the top of the inner wall of the second oil-water-sludge separator tank. The second agitator motor is fixedly connected to the output end of the second oil-water-sludge separator tank. At the top of the water-sludge separator tank, the second centrifugal agitator is installed inside the second oil-water-sludge separator tank and fixedly connected to the output end of the second agitator motor. One end of the fifteenth pipe is connected to the first oil-water-sludge separator tank and communicates with the bottom of the first oily liquid hazardous waste overflow tank. The other end of the fifteenth pipe is connected to and communicates with the inlet of the oily liquid hazardous waste transfer pump. The oil outlet valve of the first oil-water-sludge separator tank is installed on the fifteenth pipe. One end of the sixteenth pipe is connected to the second oil-water-sludge separator tank and communicates with the bottom of the second oily liquid hazardous waste overflow tank. The other end of the sixteenth pipe is connected to and communicates with the inlet of the oily liquid hazardous waste transfer pump. The oil outlet valve of the second oil-water-sludge separator tank is installed on the sixteenth pipe. One end of the seventeenth pipe is connected to and communicates with the outlet of the oily liquid hazardous waste transfer pump, and the other end is connected to and communicates with the low-level oil tank.

4. The pretreatment system for oily liquid hazardous waste according to claim 3, characterized in that: It also includes an air compressor, a fifth pipe, a sixth pipe, a backwash valve for the first oil-water-sludge separator tank, and a backwash valve for the second oil-water-sludge separator tank. One end of the fifth pipe is connected to and communicates with the outlet of the air compressor, and the other end is connected to and communicates with the discharge port of the first oil-water-sludge separator tank. The backwash valve for the first oil-water-sludge separator tank is installed on the fifth pipe. One end of the sixth pipe is connected to and communicates with the outlet of the air compressor, and the other end is connected to and communicates with the discharge port of the second oil-water-sludge separator tank. The backwash valve for the second oil-water-sludge separator tank is installed on the sixth pipe.

5. The pretreatment system for oily liquid hazardous waste according to claim 1, characterized in that: It also includes a second slag dewatering tank, a ninth pipe, a second slag dewatering tank feed valve, a twelfth pipe, and a second filtered water return valve. One end of the ninth pipe is connected to and communicates with the discharge port of the slurry pump, and the other end is connected to and communicates with the second slag dewatering tank. The second slag dewatering tank feed valve is located on the ninth pipe. A second annular filter screen is provided on the inner wall of the second slag dewatering tank. One end of the twelfth pipe is connected to and communicates with the inner wall of the second slag dewatering tank, and the other end is connected to and communicates with the inlet of the slag sedimentation tank. The second filtered water return valve is located on the twelfth pipe. A second slag discharge port is provided at the bottom of the second slag dewatering tank, and a second vibrator is provided at the second slag discharge port.

6. The pretreatment system for oily liquid hazardous waste according to claim 1, characterized in that: It also includes a tenth pipeline and a sedimentation tank supernatant transfer pump. One end of the tenth pipeline is used to connect to the water sludge sedimentation tank and communicate with the supernatant in the water sludge sedimentation tank. The sedimentation tank supernatant transfer pump is installed on the tenth pipeline.

7. A method of using the oily liquid hazardous waste pretreatment system as described in any one of claims 1 to 5, characterized in that: Includes the following steps: Oily liquid hazardous waste is transported to the oily liquid hazardous waste flushing water tank by a transport vehicle. At the same time, flushing water is sent into the oily liquid hazardous waste flushing water tank through a flushing pipe. The oily liquid hazardous waste and flushing water are mixed in the oily liquid hazardous waste flushing water tank. The mixed oily liquid hazardous waste and flushing water enter the first oil-water-sludge separator tank. At the same time, flocculant in the chemical tank enters the first oil-water-sludge separator tank. Under the centrifugal action of the first oil-water-sludge separator tank, the mixture of oily liquid hazardous waste, flushing water and flocculant forms oil, water and sludge stratification from top to bottom. The oily liquid is transported to the low-level oil tank, and the water and sludge mixture flows out of the first oil-water-sludge separator tank and flows into the water and sludge sedimentation tank for sedimentation and separation.

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