Sequencing batch demulsification and oil separation combined system

Abstract

The utility model relates to a sequencing batch type demulsification and oil separation combined system which comprises a demulsification unit and a physicochemical unit, the demulsification unit comprises an oil separation tank, a first stirrer is arranged in the oil separation tank, a cover plate is arranged at the top of the oil separation tank, an oil skimming machine is arranged on the cover plate, and the input end of the oil skimming machine penetrates through the cover plate and extends into the oil separation tank; a first feeding hole is also formed in the cover plate; a liquid inlet is formed in one side of the oil separation tank, and a liquid outlet is formed in the bottom of the oil separation tank; the physicochemical unit comprises a reaction tank, a sedimentation tank and an air flotation machine, the reaction tank is communicated with the liquid outlet, the sedimentation tank is communicated with the reaction tank, and the air flotation machine is communicated with the sedimentation tank. According to the utility model, the demulsification treatment is independently taken out, the degreasing treatment is firstly carried out in combination with the treatment mode of the oil separator, and then the coagulating sedimentation and air floatation process is carried out, so that the subsequent coagulating sedimentation efficiency can be improved by the waste liquid after the grease is removed, and the subsequent sedimentation and air floatation effects are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of degreasing waste liquid treatment, in particular to a sequential batch type demulsification and oil separation combined system. Background Art

[0002] Secondary pollutants may be generated during the treatment of electrophoresis tank replacement waste liquid, so various parameters in the treatment process must be strictly controlled to ensure the treatment effect and safety. The treatment of waste liquid is generally purified by physical, biological and chemical treatment methods. Physical treatment methods include centrifugal separation and physical precipitation. Biological treatment uses aerobic or anaerobic environment to remove organic matter in the waste liquid, while chemical treatment uses chemical agents to react, thereby converting it into low-concentration harmless substances or precipitates, and then separating them.

[0003] In the prior art, when the degreasing waste liquid is continuously treated, after the pretreatment of the physicochemical reaction, the treatment effect on the emulsified oil is not very ideal, resulting in poor coagulation and sedimentation effect, which has a great impact on the subsequent flotation treatment effect. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defect in the prior art that the emulsified oil treatment effect of the degreasing waste liquid is poor during the treatment process, resulting in poor coagulation and sedimentation effect.

[0005] In order to solve the above technical problems, the utility model provides a sequential batch demulsification and oil separation combined system, comprising:

[0006] A demulsification unit, the demulsification unit comprises a grease trap, a first agitator is arranged inside the grease trap, a cover plate is arranged on the top of the grease trap, an oil skimmer is arranged on the cover plate, an input end of the oil skimmer passes through the cover plate and extends into the grease trap; a first feed port is also arranged on the cover plate; a liquid inlet is opened on one side of the grease trap, and a liquid discharge port is arranged at the bottom of the grease trap;

[0007] The physicochemical unit comprises a reaction tank, a sedimentation tank and an air flotation machine. The reaction tank is connected to the liquid discharge port, the sedimentation tank is connected to the reaction tank, and the air flotation machine is connected to the sedimentation tank.

[0008] In one embodiment of the utility model, a first liquid level gauge is arranged inside the grease trap, and the first liquid level gauge is electrically connected to the oil skimmer and the first mixer respectively.

[0009] In one embodiment of the utility model, a buffer tank is arranged between the liquid discharge port and the reaction tank, a first water pump is arranged between the buffer tank and the liquid discharge port, and a second water pump is arranged between the buffer tank and the reaction tank.

[0010] In one embodiment of the present utility model, a second liquid level gauge is provided in the buffer tank, and the second liquid level gauge is electrically connected to the second water pump.

[0011] In one embodiment of the utility model, a plurality of partitions are arranged in the reaction tank, and the plurality of partitions divide the reaction tank into a pH adjustment tank, a coagulation tank and a flocculation tank.

[0012] In one embodiment of the utility model, a second stirrer and a pH detection head are provided in the pH adjustment tank, a third stirrer is provided in the coagulation tank, and a fourth stirrer is provided in the flocculation tank.

[0013] In one embodiment of the utility model, a second feed inlet is arranged at the top of the pH adjustment tank, a third feed inlet is arranged at the top of the coagulation tank, and a fourth feed inlet is arranged at the top of the flocculation tank.

[0014] In one embodiment of the utility model, an inclined plate is provided inside the sedimentation tank.

[0015] In one embodiment of the utility model, it also includes a scum collection tank, and the output end of the oil skimmer is connected to the scum collection tank; a first sewage outlet is provided at the bottom of the sedimentation tank, the sewage outlet is connected to the scum collection tank, and the discharge port of the flotation machine is connected to the scum collection tank.

[0016] In one embodiment of the utility model, a third liquid level gauge is provided inside the scum collection tank, a second sewage outlet is provided at the bottom of the scum collection tank, a sewage pump is provided at the second sewage outlet, and the sewage pump is electrically connected to the third liquid level gauge.

[0017] The above technical solution of the utility model has the following advantages compared with the prior art:

[0018] The utility model discloses a sequential batch type demulsification and oil separation combined system, which aims at the situation that the continuous operation of degreasing waste liquid has a poor effect on the treatment of emulsified oil, resulting in unstable flotation effluent. The demulsification treatment is taken out separately, and combined with the treatment method of the oil separator, the degreasing waste liquid is collected and first sent to the combined sequential batch reaction tank, and then promoted to the original continuous treatment of the system after the treatment is completed, and enters the coagulation sedimentation and flotation process. The waste liquid after the grease is removed can improve the efficiency of subsequent coagulation sedimentation, and ensure the effect of subsequent sedimentation and flotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the middle demulsification unit;

[0022] Figure 3 for Figure 1 Schematic diagram of the structure of the physical and chemical unit;

[0023] Figure 4 for Figure 1 Schematic diagram of the structure of the middle slag collection tank;

[0024] Description of the accompanying drawings: 1. Demulsification unit; 2. Physical and chemical unit; 3. Scum collection tank; 11. Grease trap; 12. Cover plate; 13. First mixer; 14. Oil skimmer; 15. Buffer tank; 16. First liquid level gauge; 17. First water pump; 18. Second liquid level gauge; 19. Second water pump; 21. Reaction tank; 22. Sedimentation tank; 23. Flotation machine; 31. Second sewage outlet; 32. Sewage pump; 33. Third liquid Level meter; 111, first feed inlet; 112, liquid inlet; 113, liquid discharge port; 211, pH adjustment tank; 212, coagulation tank; 213, flocculation tank; 214, second mixer; 215, third mixer; 216, fourth mixer; 217, pH detection head; 221, inclined plate; 222, first sewage outlet; 2111, second feed inlet; 2121, third feed inlet; 2131, fourth feed inlet. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0026] Reference Figure 1-Figure 4 As shown, the utility model discloses a sequential batch demulsification and oil separation combined system, comprising:

[0027] A demulsification unit 1, the demulsification unit 1 comprises a grease trap 11, a first agitator 13 is arranged inside the grease trap 11, a cover plate 12 is arranged on the top of the grease trap 11, an oil skimmer 14 is arranged on the cover plate 12, an input end of the oil skimmer 14 passes through the cover plate 12 and extends into the grease trap 11; a first feed port 111 is also arranged on the cover plate 12; a liquid inlet 112 is opened on one side of the grease trap 11, and a liquid discharge port 113 is arranged at the bottom of the grease trap 11;

[0028] The physicochemical unit 2 includes a reaction tank 21, a sedimentation tank 22 and an air flotation machine 23. The reaction tank 21 is connected to the discharge port 113, the sedimentation tank 22 is connected to the reaction tank 21, and the air flotation machine 23 is connected to the sedimentation tank 22.

[0029] It can be seen that in the utility model, the discharged waste liquid is first removed through the demulsification unit 1. Specifically, the waste liquid is input into the oil separator 11 from the liquid inlet 112, and the demulsifier is input into the oil separator 11 from the first feed port 111. The first mixer 13 stirs and repeatedly reacts the internal waste liquid to separate the grease. The separated grease will float on the top of the entire oil separator 11. Then the skimmer 14 arranged on the top of the grease separator 11 will extract the separated grease, and the remaining liquid after the grease is removed from the bottom is output from the discharge port 113 into the physicochemical reaction tank 21. Various reagents are added to the reaction tank 21 to react with the waste liquid after the grease is removed, and the impurities inside are replaced. The liquid enters the sedimentation tank 22 for precipitation, and finally the upper floating liquid of the sedimentation tank 22 is input into the flotation machine 23 for treatment, and finally the waste liquid that meets the discharge standard is obtained.

[0030] In view of the situation that the continuous operation of degreasing waste liquid has a poor effect on the treatment of emulsified oil, resulting in unstable flotation effluent, the utility model takes out the treatment of demulsification separately, combines the treatment method of the grease trap 11, collects the degreasing waste liquid and sends it to the combined batch reaction tank first, and then upgrades it to the original continuous treatment of the system after the treatment is completed, and enters the coagulation sedimentation and flotation process. The waste liquid after removing grease can improve the efficiency of subsequent coagulation sedimentation and ensure the effect of subsequent sedimentation and flotation.

[0031] Furthermore, a first liquid level gauge 16 is disposed inside the grease trap 11 , and the first liquid level gauge 16 is electrically connected to the oil skimmer 14 and the first mixer 13 , respectively.

[0032] Specifically, when waste liquid is input into the grease trap 11, the first liquid level meter 16 is used to detect and determine the liquid level of the waste liquid. When the target height is reached, the first mixer 13 starts to work, thereby ensuring accurate control of the amount of each treatment and the added reagents, thereby improving the degreasing efficiency.

[0033] Further, a buffer tank 15 is provided between the liquid discharge port 113 and the reaction tank 21, a first water pump 17 is provided between the buffer tank 15 and the liquid discharge port 113, and a second water pump 19 is provided between the buffer tank 15 and the reaction tank 21. A second liquid level gauge 18 is provided in the buffer tank 15, and the second liquid level gauge 18 is electrically connected to the second water pump 19.

[0034] Specifically, when performing degreasing treatment, the amount of each treatment is fixed, and the water after each treatment needs to be collected and stored in the buffer tank 15, and then enter the reaction tank 21 for reaction. Preferably, the drain port 113 is set at the bottom of the grease trap 11, and the water in the grease trap 11 needs to be pumped into the buffer tank 15 by the first water pump 17. The second liquid level meter 18 detects that the water in the buffer tank 15 has reached the target liquid level, and the second water pump 19 starts to work to pump the water in the buffer tank 15 into the reaction tank 21.

[0035] Furthermore, a plurality of partitions are provided in the reaction tank 21, and the plurality of partitions divide the reaction tank 21 into a pH adjustment tank 211, a coagulation tank 212 and a flocculation tank 213; a second mixer 214 and a pH detection head 217 are provided in the pH adjustment tank 211, a third mixer 215 is provided in the coagulation tank 212, and a fourth mixer 216 is provided in the flocculation tank 213.

[0036] Specifically, the reaction tank 21 is divided into multiple parts by a partition. According to the process flow, the waste liquid needs to be PH adjusted first, so that the waste liquid can be coagulated and precipitated later. After adding the PH adjusting agent, the second mixer 214 stirs for full reaction, which is detected by the PH detection head 217; the waste liquid after PH adjustment enters the coagulation tank 212, and the third mixer 215 starts to work after adding the coagulant to make it fully react; finally, it enters the flocculation tank 213 for treatment, and the fourth mixer 216 stirs for full reaction after adding the flocculant. As a preferred embodiment of the utility model, the overflow ports on the partitions between the PH adjustment tank 211, the coagulation tank 212 and the flocculation tank 213 are multiple overflow ports that are opened in a stepped manner.

[0037] Furthermore, a second feed inlet 2111 is disposed on the top of the pH adjustment tank 211 , a third feed inlet 2121 is disposed on the top of the coagulation tank 212 , and a fourth feed inlet 2131 is disposed on the top of the flocculation tank 213 .

[0038] Specifically, the pH regulator is added from the second feed port 2111, the coagulant is added from the third feed port 2121, and the flocculant is added from the fourth feed port 2131. As a preferred embodiment of the present invention, the pH regulator is NaOH, the coagulant is PAC, the flocculant is PAM, and the tops of the pH adjustment tank 211, the coagulation tank 212 and the flocculation tank 213 are all provided with matching dosing systems to control the dosage.

[0039] Furthermore, an inclined plate 221 is provided inside the sedimentation tank 22. Specifically, the waste liquid entering the sedimentation tank 22 is quickly separated under the action of the inclined plate 221.

[0040] Furthermore, it also includes a scum collection tank 3, the output end of the oil skimmer 14 is connected to the scum collection tank 3; the bottom of the sedimentation tank 22 is provided with a first sewage outlet 222, the sewage outlet is connected to the scum collection tank 3, and the discharge port of the air flotation machine 23 is connected to the scum collection tank 3. Specifically, the function of the scum collection tank 3 is to collect waste (slag and grease foam, etc.) generated by each part of the entire system.

[0041] Furthermore, a third liquid level gauge 33 is provided inside the scum collection tank 3 , a second sewage outlet 31 is provided at the bottom of the scum collection tank 3 , a sewage pump 32 is provided at the second sewage outlet 31 , and the sewage pump 32 is electrically connected to the third liquid level gauge 33 .

[0042] Specifically, the liquid level in the scum collection tank 3 is detected by the third liquid level meter 33 . When the liquid level reaches a set value, the second sewage outlet 31 is opened, and the scum collection tank 3 is evacuated by the dedicated sewage pump 32 .

[0043] In summary, the utility model introduces a sequential batch demulsification and oil separation combined system, and the specific steps are as follows: when the first liquid level meter 16 is connected to the high point, the demulsifier is added to the first feed port, and the first mixer 13 starts working at the same time. After stirring for 5 minutes, it is left to stand for 30 minutes; then the skimmer 14 is turned on and scraped for five minutes, and then the first water pump 17 is turned on to lift all the waste liquid in the oil separator 11 into the buffer tank 15; after the buffer tank 15 is filled with liquid, the second water pump 19 works to pump the waste liquid into the reaction tank 21 for reaction in sequence, and the waste liquid flowing out of the reaction tank 21 enters the sedimentation tank 22 for sedimentation and separation, and finally enters the flotation machine 23 for treatment. In view of the situation that the continuous operation of degreasing waste liquid has a poor effect on the treatment of emulsified oil, resulting in unstable flotation effluent, the utility model takes out the treatment of demulsification separately, combines the treatment method of the grease trap 11, collects the degreasing waste liquid and sends it to the combined batch reaction tank first, and then upgrades it to the original continuous treatment of the system after the treatment is completed, and enters the coagulation sedimentation and flotation process. The waste liquid after removing grease can improve the efficiency of subsequent coagulation sedimentation and ensure the effect of subsequent sedimentation and flotation.

[0044] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A sequential batch demulsification and oil separation combined system, characterized in that: include: A demulsification unit, the demulsification unit comprises a grease trap, a first agitator is arranged inside the grease trap, a cover plate is arranged on the top of the grease trap, an oil skimmer is arranged on the cover plate, an input end of the oil skimmer passes through the cover plate and extends into the grease trap; a first feed port is also arranged on the cover plate; a liquid inlet is opened on one side of the grease trap, and a liquid discharge port is arranged at the bottom of the grease trap; The physicochemical unit comprises a reaction tank, a sedimentation tank and an air flotation machine. The reaction tank is connected to the liquid discharge port, the sedimentation tank is connected to the reaction tank, and the air flotation machine is connected to the sedimentation tank.

2. The sequential batch demulsification and oil separation combined system according to claim 1 is characterized in that: A first liquid level gauge is arranged inside the grease trap, and the first liquid level gauge is electrically connected to the oil skimmer and the first mixer respectively.

3. The sequential batch demulsification and oil separation combined system according to claim 1 is characterized in that: A buffer tank is arranged between the liquid discharge port and the reaction tank, a first water pump is arranged between the buffer tank and the liquid discharge port, and a second water pump is arranged between the buffer tank and the reaction tank.

4. The sequential batch demulsification and oil separation combined system according to claim 3 is characterized in that: A second liquid level gauge is arranged in the buffer tank, and the second liquid level gauge is electrically connected to the second water pump.

5. The sequential batch demulsification and oil separation combined system according to claim 1 is characterized in that: A plurality of partitions are arranged in the reaction tank, and the plurality of partitions divide the reaction tank into a pH adjustment tank, a coagulation tank and a flocculation tank.

6. The sequential batch demulsification and oil separation combined system according to claim 5 is characterized in that: The pH adjustment tank is provided with a second stirrer and a pH detection head, the coagulation tank is provided with a third stirrer, and the flocculation tank is provided with a fourth stirrer.

7. The sequential batch demulsification and oil separation combined system according to claim 5 is characterized in that: A second feed inlet is arranged at the top of the pH adjustment tank, a third feed inlet is arranged at the top of the coagulation tank, and a fourth feed inlet is arranged at the top of the flocculation tank.

8. The sequential batch demulsification and oil separation combined system according to claim 1 is characterized in that: An inclined plate is arranged inside the sedimentation tank.

9. The sequential batch demulsification and oil separation combined system according to claim 1, characterized in that: It also includes a scum collection tank, the output end of the oil skimmer is connected to the scum collection tank; a first sewage outlet is provided at the bottom of the sedimentation tank, the sewage outlet is connected to the scum collection tank, and the discharge port of the air flotation machine is connected to the scum collection tank.

10. The sequential batch demulsification and oil separation combined system according to claim 9, characterized in that: A third liquid level gauge is arranged inside the scum collection tank, a second sewage outlet is arranged at the bottom of the scum collection tank, a sewage pump is arranged at the second sewage outlet, and the sewage pump is electrically connected to the third liquid level gauge.

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