Low flash hazardous waste liquid disposal apparatus and method

Abstract

The present application belongs to the technical field of hazardous waste treatment, and particularly relates to a low-flash hazardous waste liquid treatment device and a treatment method. First, the flash point value information of the material is obtained, and the control system classifies and treats the hazardous waste liquid according to the flash point value. Then, the viscosity of the material is tested, and the control system classifies the hazardous waste liquid again according to the viscosity. Then, the hazardous waste liquid is classified into three levels according to the compatibility with the organic solvent. If the material is not compatible with the organic solvent, the material is mixed with inert materials and then packaged. If the material is compatible with the organic solvent, the material is mixed with the organic solvent, and then sprayed and burned after passing through a peristaltic pump. The present application classifies and treats the hazardous waste liquid in an orderly manner by gradually testing the performance of the hazardous waste liquid, and forms a systematic hazardous waste liquid treatment method and device. According to the method of the present application, the hazardous waste liquid can be efficiently treated, the treatment time is saved, and resource utilization and distribution are maximized.

Description

Technical Field

[0001] This invention belongs to the field of hazardous waste treatment technology, specifically, it relates to a device and method for treating low-flash hazardous waste liquid. Background Technology

[0002] Flash point, also known as ignition point, refers to the lowest temperature at which the vapor produced on the surface of a flammable liquid or solid is ignited under the action of a test flame in a stable air environment. Flash point is the lowest temperature at which a flammable liquid or solid can release sufficient vapor to form a flammable mixture with air at the surface of the liquid or solid in the container. The flash point of a flammable liquid varies with its concentration. Hazardous liquids with low flash points, such as ether and gasoline, may pose risks of combustion and explosion if not handled promptly.

[0003] Currently, low-flash and viscous hazardous liquid waste is generally packaged into smaller containers and then disposed of through high-temperature incineration and acid washing. Conventional small packages use glass bottles with volumes of 200mL, 500mL, or 1L to hold the hazardous waste liquid, which is then placed directly into cardboard boxes and sealed with tape. However, this method of repackaging prolongs disposal time, increases repackaging costs, and requires manual feeding. Furthermore, during feeding, the material is prone to deflagration within the rotary kiln, causing data fluctuations, equipment damage, and other abnormal operating conditions.

[0004] Chinese Patent CN111701509A discloses a pretreatment device and method for mixing low-flash hazardous waste liquid. The device involves placing fly ash powder for mixing at a designated stirring and feeding point, and then extruding the low-flash hazardous liquid through a guide component into a mixing shell. The fly ash powder and low-flash hazardous liquid are mixed and extruded through an extruder, achieving mixing simultaneously with extrusion. This device shortens the mixing and extrusion time and increases the pretreatment rate of low-flash hazardous liquid. While this treatment device provides a reference for the efficient mixing of hazardous waste liquids and powders, it is not suitable for all hazardous waste liquids. Exploring a treatment scheme applicable to all hazardous waste liquids is of significant importance in this field. Summary of the Invention

[0005] In view of the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a low-flash hazardous waste liquid treatment device and treatment method.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows: A method for disposing of low-flash hazardous waste liquid involves first obtaining the flash point value of the hazardous waste liquid, then judging the flash point value through a control system. If the flash point value is greater than or equal to a preset flash point value, the liquid is packaged and processed as conventional material. If the flash point value of the hazardous waste liquid is less than the preset flash point value, the viscosity of the hazardous waste liquid is tested. The viscosity of the hazardous waste liquid is determined by the control system. If the viscosity is less than the preset viscosity value, the hazardous waste liquid is directly sprayed and burned through a peristaltic pump. If the viscosity is greater than or equal to the preset viscosity value, the compatibility between the hazardous waste liquid and the organic solvent is determined. If the hazardous waste liquid is incompatible with the organic solvent, it should be mixed with an inert material and then packaged separately; if they are compatible, the hazardous waste liquid should be mixed with the organic solvent and then sprayed and burned through a peristaltic pump.

[0007] Optionally, when hazardous waste materials are mixed with organic solvents, they are mixed until the viscosity is less than the preset viscosity value before being sprayed and burned through a peristaltic pump.

[0008] Optionally, the viscosity preset value is 10000 cps.

[0009] Optionally, the organic solvent is gasoline, DMF, toluene-containing waste liquid, or waste cleaning agent.

[0010] Optionally, the inert material is one of activated carbon, sludge, and sawdust.

[0011] The low-flash hazardous waste liquid disposal device using the above method includes a waste liquid inlet pipe connected to a flash point detector. The flash point detector is connected to a first viscosity detector via a first pipe and to a first dispensing device via a second pipe. The first viscosity detector is connected to a compatibility testing device via a third pipe and to a peristaltic pump via a fourth pipe. The outlet of the peristaltic pump is connected to a combustion chamber. The compatibility testing device is connected to an organic solvent mixer via a fifth pipe. An organic solvent input pipe is connected to the organic solvent mixer, and the outlet of the organic solvent mixer is connected to the peristaltic pump. The compatibility testing device is connected to a mixer via a sixth pipe. The mixer is equipped with an inert material inlet pipe, and the outlet of the mixer is connected to a second dispensing device.

[0012] Optionally, the compatibility testing device is connected to an organic solvent inlet pipeline, and an intermittent stirrer is installed inside the compatibility testing device, with a waste outlet at the bottom of the device.

[0013] Optionally, the outlet of the organic solvent mixer is connected to the peristaltic pump via a second viscosity detector, which is connected to the organic solvent mixer via a valve and a circulation pipeline.

[0014] Optionally, control valves are provided on the first, second, third, fourth, fifth, and sixth pipelines.

[0015] Optionally, the control system is connected to a flash point detector, a first viscosity detector, a compatibility testing device, and all control valves.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a systematic intelligent method and apparatus for the treatment of hazardous waste liquids by progressively measuring their properties and classifying them for orderly disposal. The method allows for the efficient treatment of all hazardous waste liquids, saving disposal time, maximizing resource utilization and allocation, reducing labor costs, and ensuring personal safety. Furthermore, once the liquid meets the requirements, it is stably fed through a peristaltic pump, avoiding the dangers of deflagration and equipment damage during incineration. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a method for treating hazardous liquid waste with low flashover. Figure 2 This is a schematic diagram of a low-flash hazardous waste liquid treatment device; In the diagram: 1. Waste liquid inlet pipe; 2. Flash point detector; 3. First viscosity detector; 4. First dispenser; 5. Compatibility testing device; 6. Peristaltic pump; 7. Combustion chamber; 8. Mixer; 9. Inert material inlet pipe; 10. Second dispenser; 11. Organic solvent mixer; 12. Second viscosity detector; 13. Organic solvent input pipe. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments.

[0019] Example like Figure 1 , Figure 2As shown, a low-flash hazardous waste liquid disposal device includes a control system, a waste liquid inlet pipe 1, and a flash point detector 2. The waste liquid inlet pipe 1 is connected to the flash point detector 2. The flash point detector 2 is connected to a first viscosity detector 3 through a first pipe and to a first dispenser 4 through a second pipe. The first viscosity detector 3 is connected to a compatibility testing device 5 through a third pipe and to a peristaltic pump 6 through a fourth pipe. The outlet of the peristaltic pump 6 is connected to a combustion chamber 7. The compatibility testing device 5 is connected to an organic solvent mixer 11 through a fifth pipe. An organic solvent input pipe 13 is connected to the organic solvent mixer 11. The outlet of the organic solvent mixer 11 is connected to the peristaltic pump 6. The compatibility testing device 5 is connected to a mixer 8 through a sixth pipe. The mixer 8 is equipped with an inert material inlet pipe 9 and its outlet is connected to a second dispenser 10. Control valves are installed on the first pipeline 21, the second pipeline 22, the third pipeline 31, the fourth pipeline 32, the fifth pipeline 51, and the sixth pipeline 52. To ensure that the viscosity of the liquid entering the peristaltic pump 6 meets the requirements, the outlet of the organic solvent mixer 11 is connected to the peristaltic pump 6 via the second viscosity detector 12. The second viscosity detector 12 is connected to the organic solvent mixer 11 through a valve and a circulation pipeline. The control system is connected to the flash point detector 2, the first viscosity detector 3, the second viscosity detector 12, the compatibility testing device 5, and all control valves.

[0020] The compatibility testing device 5 includes a feed tank. An observation chamber is connected to the bottom of the feed tank via an openable opening. The observation chamber is connected to an organic solvent inlet pipe 13. An agitator is installed inside the observation chamber. Density detectors are installed at the top and bottom of the observation chamber, and a liquid level detector and a waste outlet are located at the bottom of the observation chamber. After the hazardous waste liquid enters the feed tank, it first flows into the observation chamber at the bottom of the feed tank through the opening, while the organic solvent also flows into the observation chamber simultaneously. The flow rate of the organic solvent is controlled to be approximately equal to the flow rate of the hazardous waste liquid. When the liquid level detector detects that the liquid in the observation chamber has reached the required level, the control system closes the opening and stops the flow of organic solvent into the observation chamber. The agitator rotates for a certain period and then stops. After a certain period of stillness, the density detector detects the density of the liquid above and below the observation chamber. The control system determines compatibility by comparing whether the densities are the same or similar (within a limited error range). During this period, the liquid continues to enter the feed tank normally, and the flow direction of the liquid in the feed tank is controlled according to the judgment result. After the compatibility judgment is completed, the waste liquid is discharged through the waste outlet. This device enables online compatibility testing.

[0021] Specifically, the steps are as follows: After the hazardous waste liquid enters through the waste liquid inlet pipe 1, the flash point value of the hazardous waste liquid is first obtained through a flash point detector. Then, the control system judges the flash point value. If the flash point value is greater than or equal to the preset flash point value (60℃), the control valve of the second pipe 22 is opened under the control of the control system, and the hazardous waste liquid enters the first distributor 4 for conventional material processing. It is then processed according to conventional material handling, and its acidity, alkalinity, oxidizing properties, etc., are tested. If there is no reactivity, it is directly sprayed or put into the material pit. If the flash point value of the hazardous waste liquid is less than the preset flash point value, the control valve on the first pipe 21 is opened under the control of the control system, and the hazardous waste liquid enters the first viscosity detector 3 for testing. The viscosity test result from the first viscosity detector 3 is fed back to the control system. The control system judges the viscosity of the hazardous waste liquid. If the viscosity is less than the preset viscosity value (10,000 cps), the control system controls the control valve on the fourth pipeline 32 to open, allowing the hazardous waste liquid to be directly injected into the combustion chamber 7 via the peristaltic pump 6 for combustion. If the viscosity is greater than or equal to the preset viscosity value, the control system controls the control valve on the third pipeline 31 to open, allowing the hazardous waste liquid to enter the compatibility testing device 5 to determine the compatibility between the hazardous waste liquid and the organic solvent. The organic solvent can be gasoline, DMF, toluene-containing waste liquid, or waste cleaning agent. The compatibility testing device 5 feeds back the test result to the control system. If the hazardous waste liquid and the organic solvent are incompatible, the control valve on the sixth pipeline 52 is opened, allowing the hazardous waste liquid to be mixed with inert materials. After mixing in the container 8, the waste liquid is packaged and then manually added. The inert material is one of activated carbon, sludge, or sawdust. If the materials are compatible, the control valve on the fifth pipeline 51 is opened, and the hazardous waste liquid is mixed with the organic solvent in the organic solvent mixer 11. Then, after the second viscosity detector 12 determines that the viscosity is less than the preset value, the waste liquid enters the combustion chamber 7 for combustion via the peristaltic pump 6. If the second viscosity detector 12 determines that the viscosity is greater than or equal to the preset viscosity value, the valve on the control circulation pipeline is opened, and the waste liquid enters the organic solvent mixer 11 again to mix with the organic solvent. Once the viscosity is less than the preset viscosity value, the waste liquid can enter the combustion chamber 7 for combustion. This completes the classification and treatment of hazardous waste liquid. The device can operate automatically under the control of the control system, saving manpower and maximizing the rational utilization of resources.

[0022] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for treating low-flashover hazardous liquid, characterized in that, First, obtain the flash point value information of the hazardous waste liquid. Then, judge the flash point value through the control system. If the flash point value is greater than or equal to the preset flash point value, it will be packaged and processed as a conventional material. If the flash point value of the hazardous waste liquid is less than the preset flash point value, the viscosity of the hazardous waste liquid shall be tested. The viscosity of the hazardous waste liquid is judged by the control system. If the viscosity is less than the preset viscosity value, the hazardous waste liquid is directly sprayed and burned by the peristaltic pump (6). If the viscosity is greater than or equal to the preset viscosity value, the compatibility between the hazardous waste liquid and the organic solvent is judged. If the hazardous waste liquid is incompatible with the organic solvent, the hazardous waste liquid is mixed with the inert material and then packaged separately; if they are compatible, the hazardous waste liquid is mixed with the organic solvent and then sprayed and burned through a peristaltic pump (6).

2. The method for treating low-flash hazardous liquid according to claim 1, characterized in that, When hazardous waste materials are mixed with organic solvents, they are mixed until the viscosity is less than the preset viscosity value, and then sprayed and burned by peristaltic pump (6).

3. The method for treating low-flash hazardous liquid according to claim 1, characterized in that, The preset viscosity value is 10000 cps.

4. The method for disposing of low-flash hazardous liquid according to claim 1, characterized in that, The organic solvent is gasoline, DMF, or waste liquid containing toluene.

5. The method for treating low-flash hazardous liquid according to claim 1, characterized in that, The inert material is one of activated carbon, sludge, or sawdust.

6. A low-flash hazardous waste liquid treatment device employing the method according to any one of claims 1-5, characterized in that, The system includes a waste liquid inlet pipe (1), which is connected to a flash point detector (2). The flash point detector (2) is connected to a first viscosity detector (3) via a first pipe, and the flash point detector (2) is connected to a first dispenser (4) via a second pipe. The first viscosity detector (3) is connected to a compatibility testing device (5) via a third pipe, and the first viscosity detector (3) is connected to a peristaltic pump (6) via a fourth pipe. The outlet of the peristaltic pump (6) is connected to a combustion device. The compatibility testing device (5) is connected to an organic solvent mixer (11) via a fifth pipeline. An organic solvent input pipeline (13) is connected to the organic solvent mixer (11). The outlet of the organic solvent mixer (11) is connected to the peristaltic pump (6). The compatibility testing device (5) is connected to a mixer (8) via a sixth pipeline. An inert material inlet pipe (9) is provided on the mixer (8). The outlet of the mixer (8) is connected to a second dispenser (10).

7. A low-flashover hazardous waste liquid treatment device according to claim 6, characterized in that, The compatibility testing device (5) is connected to the organic solvent input pipeline (13). An intermittent stirrer is installed inside the compatibility testing device (5), and a waste discharge port is provided at the bottom of the compatibility testing device (5).

8. A low-flash hazardous waste liquid treatment device according to claim 6, characterized in that, The outlet of the organic solvent mixer (11) is connected to the peristaltic pump (6) via a second viscosity detector (12), which is connected to the organic solvent mixer (11) via a valve and a circulation pipeline.

9. A low-flashover hazardous waste liquid treatment device according to claim 6, characterized in that, Control valves are installed on the first, second, third, fourth, fifth, and sixth pipelines.

10. A low-flash hazardous waste liquid treatment device according to claim 6, characterized in that, The control system is connected to the flash point detector (2), the first viscosity detector (3), the compatibility testing device (5), and all control valves.

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