An oil-containing fire-fighting sewage emergency treatment and recycling device and method

Abstract

The application discloses an oil-containing fire-fighting sewage emergency treatment and recycling device and method. The oil-containing fire-fighting sewage emergency treatment and recycling device comprises a stirring pool, a T-shaped pipe separator, a dissolved air tank and an overflow collecting tank. The T-shaped pipe separator is internally provided with upper, middle and lower horizontal pipes which are communicated through a plurality of vertical pipes. Each vertical pipe is internally provided with an electrolytic electrode which is connected with a power supply. The fire-fighting sewage inflow end of the T-shaped pipe separator is connected with the stirring pool. The dissolved air water inflow end is connected with the dissolved air tank. The gas-liquid-solid phase outflow end is connected with the overflow collecting tank. The fire-fighting recycling water outflow end is connected with the top end of the dissolved air tank. The application further provides an oil-containing fire-fighting sewage emergency treatment and recycling device method. The method forms an emergency treatment process scheme according to the source, use and on-site power supply condition of the oil-containing fire-fighting sewage, realizes the rapid separation of various impurities in the oil-containing sewage, and effectively solves the problems of environmental pollution caused by the oil-containing fire-fighting sewage and insufficient fire-fighting water resources.

Description

Technical Field

[0001] The present invention relates to the technical field of oily wastewater treatment, and in particular to a device and method for emergency treatment and reuse of oily firefighting wastewater. Background Art

[0002] As the scale of petrochemical enterprise tank farms continues to expand, the risk of accidents caused by petrochemical enterprise tank farms is also increasing, especially the risk of fire caused by petrochemical enterprise tank farms. Tank farm fire accidents are usually sudden, harmful, and difficult to extinguish.

[0003] At present, the handling of tank leakage and fire accidents mostly adopts foam fire extinguishing equipment in combination with tank cooling protection and other means. The existing tank leakage and fire accident handling methods will generate a large amount of cooling wastewater and firefighting sewage in a short period of time. If improperly handled, it is very easy to cause secondary accidents such as environmental pollution. On the other hand, long-term fire rescue is bound to face the problem of insufficient firefighting water resources.

[0004] At present, the emergency treatment and reuse equipment for oil-containing fire-fighting wastewater used at the scene of tank area leakage and fire accidents is mainly affected by the oil, particulate matter and foam liquid surfactant components in the fire-fighting wastewater. The oil, particulate matter and foam liquid surfactant components in the reused fire-fighting wastewater will affect the foaming multiple, fire control time, liquid separation time and anti-burning time of the emergency treatment and reuse equipment for oil-containing fire-fighting wastewater, reducing the service life of the internal pipelines and pumps of the fire truck in the emergency treatment and reuse equipment for oil-containing fire-fighting wastewater. On the other hand, if there is a large amount of floating oil in the reused fire-fighting wastewater, it will lead to safety hazards in the emergency treatment and reuse process of oil-containing fire-fighting wastewater, which is easy to cause secondary disasters such as fire and explosion. Moreover, if the reused fire-fighting water contains oil-containing fire-fighting foam liquid components, the formula components of different brands of foam liquid may interact with each other during foaming, reducing the use effect of fire-fighting foam.

[0005] The emergency treatment and reuse of firefighting wastewater in petrochemical tank areas primarily focuses on separating oil from foam liquid. For oil separation, using a grease trap as a firefighting wastewater emergency treatment and reuse device has problems such as long hydraulic retention time and large footprint, making it unsuitable for petrochemical tank areas. Using flotation equipment as a firefighting wastewater emergency treatment and reuse device has high energy consumption and requires the addition of chemicals. Using gravity separation-based firefighting wastewater emergency treatment and reuse devices has low separation efficiency. Using membrane separation-based firefighting wastewater emergency treatment and reuse devices, the membrane separation flux and pollution resistance are affected by the membrane material. Using surfactant separation and foam liquid separation methods both have insufficient separation efficiency, while using coagulation and electroflocculation methods has long reaction times and insufficient adsorption capacity. Furthermore, filtration, sedimentation, and gravity separation methods are not suitable for separating particulate matter from firefighting wastewater. Filtration cannot be operated continuously, and sedimentation has a long settling time and large equipment footprint. Gravity separation is difficult to apply for liquid-solid separation in petrochemical tank areas. Therefore, at present, there is a lack of an emergency treatment and reuse device for oily firefighting wastewater that can simultaneously and quickly separate multiple impurities such as oil, particulate matter, surfactants, etc. in oily firefighting wastewater.

[0006] Firefighting wastewater at the scene of a tank farm leak or fire accident is primarily divided into firefighting wastewater and cooling wastewater, each with varying oil and foam content. Firefighting recycled water can be used for either firefighting or cooling, with varying treatment requirements and throughput. Currently, there is a lack of a method that can tailor treatment solutions to the specific uses of firefighting wastewater and firefighting recycled water, enabling continuous and rapid separation of oil and foam surfactant components to meet the needs of both environmentally friendly wastewater treatment at the accident site and firefighting water resources.

[0007] In summary, it is urgent to propose an emergency treatment and reuse device and method for oily firefighting sewage to realize the emergency treatment and reuse of firefighting sewage at the accident site, avoid oily firefighting sewage from polluting the environment, and solve the problem of insufficient water resources. Summary of the Invention

[0008] In response to the current problem that it is impossible to simultaneously achieve rapid batch separation of multiple impurities in oily firefighting wastewater, the present invention proposes an emergency treatment and reuse device and method for oily firefighting wastewater, which achieves rapid separation of impurities such as oil, particulate matter, and surfactants in oily firefighting wastewater. At the same time, different process treatment schemes are formed according to the characteristics and uses of different firefighting wastewater, thereby achieving emergency treatment and reuse of firefighting wastewater at the accident site, effectively solving the problems of environmental pollution caused by oily firefighting wastewater and insufficient water resources for firefighting.

[0009] The present invention specifically adopts the following technical solutions:

[0010] An emergency treatment and reuse device for oily fire-fighting wastewater, comprising a stirring tank, a T-tube separator, an air dissolving tank and an overflow collection tank;

[0011] The T-tube separator is provided with a fire sewage inlet end, a dissolved air water inlet end, a gas-liquid-solid phase outflow end and a fire reuse water outflow end. The fire sewage inlet end and the dissolved air water inlet end are arranged on the same side of the T-tube separator, and the gas-liquid-solid phase outflow end and the fire reuse water outflow end are arranged on the other side of the T-tube separator.

[0012] The fire sewage inflow end of the T-tube separator is connected to the stirring tank through a first pipeline. A feed pump is provided on the side of the first pipeline close to the stirring tank, and a feed flow meter is provided on the side close to the fire sewage inflow end of the T-tube separator;

[0013] The stirring tank is connected to the oily firefighting sewage injection pipeline through a liquid inlet pipeline. An agitator is provided in the stirring tank for uniformly stirring the oily firefighting sewage and the input agent.

[0014] The dissolved air water inlet end of the T-tube separator is connected to the bottom of the dissolved air tank through a second pipeline, and a releaser is provided at the connection end of the second pipeline and the T-tube separator;

[0015] An air injection pipeline is also provided at the bottom of the air dissolving tank, and an air compressor, a first control valve, an air flow meter and a check valve are sequentially provided on the air injection pipeline. The air compressor is provided near the air inlet end of the air injection pipeline and is used to inject compressed air into the air injection pipeline;

[0016] The top of the gas dissolving tank is provided with a pressure gauge and a safety valve, the pressure gauge is used to measure the pressure inside the gas dissolving tank, the safety valve is used to unload the pressure inside the gas dissolving tank, a liquid level gauge is provided on the side wall of the gas dissolving tank, used to measure the liquid level height inside the gas dissolving tank, and a packing layer is provided inside the gas dissolving tank to increase the gas dissolving efficiency of the gas dissolving tank;

[0017] The gas-liquid-solid phase outflow end of the T-tube separator is connected to an overflow collection tank, and the overflow collection tank is used to collect waste materials flowing out of the gas-liquid-solid phase outflow end of the T-tube separator;

[0018] The fire-fighting recycled water outflow end of the T-tube separator is connected to the inflow end of the third pipeline. The second control valve and the liquid phase outlet flowmeter are sequentially arranged on the third pipeline. The second control valve is close to the inflow end of the third pipeline. The outflow end of the third pipeline is divided into two paths, one of which is connected to the external water pipeline through the fourth pipeline, and the other is connected to the top of the dissolved air tank through the fifth pipeline. The third control valve, reflux pump and reflux flowmeter are sequentially arranged on the fifth pipeline. The third control valve is close to the injection end of the fifth pipeline.

[0019] Preferably, the T-tube separator includes a horizontal pipe section and a vertical pipe section, wherein the horizontal pipe section includes an upper horizontal pipe, a middle horizontal pipe and a lower horizontal pipe, and the vertical pipe section includes a plurality of vertical pipes;

[0020] One end of the upper horizontal pipe is blocked, and the other end is set as the gas-liquid-solid phase outflow end; one end of the middle horizontal pipe is set as the fire sewage inflow end, and the other end is blocked; one end of the lower horizontal pipe is set as the dissolved air water inflow end, and the other end is set as the fire recycled water outflow end; the upper horizontal pipe, the middle horizontal pipe and the lower horizontal pipe are connected in the vertical direction through multiple vertical pipes;

[0021] The vertical tubes are evenly distributed on the middle horizontal tube, and the intervals between adjacent vertical tubes are the same. The vertical tubes pass through the middle horizontal tube, and the top ends extend into the upper horizontal tube and the bottom ends extend into the lower horizontal tube, connecting the upper horizontal tube, the middle horizontal tube and the lower horizontal tube in the vertical direction;

[0022] An electrolysis electrode is provided in each vertical tube between the middle horizontal tube and the lower horizontal tube. The length of the electrolysis electrode is equal to the vertical distance between the middle horizontal tube and the lower horizontal tube. Each electrolysis electrode is connected in parallel with the power supply. The electrolysis electrode close to the fire sewage inflow end of the T-tube separator is connected to the positive pole of the power supply, and the electrolysis electrode close to the fire recycled water outflow end of the T-tube separator is connected to the negative pole of the power supply. The number of electrolysis electrodes connected to the positive pole of the power supply is equal to the number of electrolysis electrodes connected to the negative pole of the power supply.

[0023] Preferably, the diameters D of the upper horizontal pipe, the middle horizontal pipe, and the lower horizontal pipe in the horizontal pipe section of the T-tube separator are all the same. The diameter of the horizontal pipe section in the T-tube separator is determined according to the injection amount and injection flow rate of the oily firefighting sewage, as shown in formula (1):

[0024]

[0025] Where,

[0026] Q—injection volume of oily firefighting sewage;

[0027] D—pipe diameter;

[0028] V—injection velocity of oily firefighting sewage;

[0029] The diameter of the vertical tube in the vertical tube section, the height of the vertical tube, and the spacing between adjacent vertical tubes are set according to the diameter D of the horizontal tube section in the T-tube separator. The diameter of the vertical tube is set to half the diameter D of the horizontal tube section, the height of the vertical tube is set to ten times the diameter D of the horizontal tube section, and the spacing between adjacent vertical tubes is set to twenty times the diameter D of the horizontal tube section.

[0030] Preferably, the number of the vertical tubes is set to an even number.

[0031] Preferably, the number of vertical pipes in the T-tube separator is set according to the injection volume of oily firefighting sewage;

[0032] When the injection volume Q of oily firefighting sewage does not exceed 50m 3 / h, the number of vertical tubes in the T-tube separator is set to 4, and 4 electrolysis electrodes are set, of which 2 electrolysis electrodes are connected to the positive electrode of the power supply, and 2 electrolysis electrodes are connected to the negative electrode of the power supply;

[0033] When the injection volume Q of oily firefighting sewage is greater than 50m 3 / h and not more than 100m 3 / h, the number of vertical tubes in the T-tube separator is set to 6, and 6 electrolysis electrodes are set, of which 3 electrolysis electrodes are connected to the positive electrode of the power supply, and 3 electrolysis electrodes are connected to the negative electrode of the power supply;

[0034] When the injection volume Q of oily firefighting sewage is greater than 100m 3 / h and not more than 200m 3 / h, the number of vertical tubes in the T-tube separator is set to 8, and 8 electrolysis electrodes are set, of which 4 electrolysis electrodes are connected to the positive electrode of the power supply, and 4 electrolysis electrodes are connected to the negative electrode of the power supply.

[0035] Preferably, the volume V of the stirring tank is 搅 It is determined based on the injection volume of oily fire-fighting sewage and the premixing time of the selected demulsifier.

[0036] Preferably, the volume V of the stirring tank is 搅 Set to 5m 3 .

[0037] Preferably, the releaser is configured as a TS-type releaser, a TJ-type releaser or a TV-type releaser.

[0038] Preferably, the packing layer is filled with ball ring packing, porcelain Raschig ring packing, plastic step ring packing or corrugated packing.

[0039] Preferably, the electrolysis electrode connected to the positive electrode of the power supply is made of a transition metal material, and the electrolysis electrode connected to the negative electrode of the power supply is made of an inert electrode.

[0040] Preferably, the current density of the power supply is set to 1-2000A / m 2 .

[0041] Preferably, a plurality of T-tube separators are provided in the oily fire-fighting wastewater emergency treatment and reuse device, and the T-tube separators are connected in parallel with each other through pipelines.

[0042] A method for emergency treatment and reuse of oily firefighting wastewater, using the above-mentioned emergency treatment and reuse device for oily firefighting wastewater, specifically comprises the following steps:

[0043] Step 1: Determine the treatment standard for the oily firefighting wastewater based on the source of the oily firefighting wastewater and the intended use of the treated wastewater, combined with the water quality test results of the oily firefighting wastewater;

[0044] Step 2: Determine the process parameters for the treatment of the oily firefighting wastewater based on the source and purpose of the oily firefighting wastewater and the power requirements at the site of the emergency treatment and reuse of the oily firefighting wastewater, and formulate an emergency treatment process plan for the oily firefighting wastewater.

[0045] Step 3: According to the emergency treatment process plan for oily fire-fighting wastewater, the oily fire-fighting wastewater is emergency treated using the oily fire-fighting wastewater emergency treatment and reuse device, and the emergency treatment process plan for oily fire-fighting wastewater is dynamically adjusted during the emergency treatment process to obtain treated oily fire-fighting wastewater.

[0046] Preferably, in step 1, if the purpose of the oily fire-fighting wastewater after treatment is fire-fighting water, the oil-containing fire-fighting wastewater emergency treatment and reuse device is used to deeply separate the oil and foam liquid in the oily fire-fighting wastewater, so that the oil content in the treated oily fire-fighting wastewater is less than 50 mg / L and the content of the foam liquid surfactant is less than 10 mg / L; if the purpose of the oily fire-fighting wastewater after treatment is cooling water, the oil-containing fire-fighting wastewater emergency treatment and reuse device is used to separate the oil in the oily fire-fighting wastewater, so that the oil content in the treated oily fire-fighting wastewater is less than 100 mg / L.

[0047] Preferably, in step 2, the process parameters for treating oily firefighting wastewater include demulsifier dosage, flocculant dosage, T-tube separator split ratio and reflux ratio, internal pressure and gas-liquid ratio of the air dissolving tank, and current density of the power supply.

[0048] Preferably, the demulsifier dosage is set to 20-50 mg / L, the flocculant dosage is set to 100-250 mg / L, the split ratio of the T-tube separator is set to 0.80-0.95, the reflux ratio of the T-tube separator is set to 0.05-0.2, the internal pressure of the gas dissolving tank is set to 0.2-0.4 MPa, the gas-liquid ratio of the gas dissolving tank is set to 0.03-0.06, and the current density of the power supply is set to 1-2000 A / m 2 ;

[0049] The T-tube separator split ratio calculation formula is:

[0050] S=1-1.5α in (2)

[0051] Where,

[0052] S—Split ratio of T-tube separator;

[0053] α in —The concentration of oil in oily firefighting wastewater.

[0054] Preferably, the specific treatment process of treating oily firefighting wastewater using the oily firefighting wastewater emergency treatment and reuse device is as follows:

[0055] The oily firefighting sewage is injected into the mixing tank, and the demulsifier and flocculant are added to stir evenly. After that, the sewage is injected into the T-tube separator through the inlet end of the T-tube separator. At this time, the oily firefighting sewage exists in three phases: solid phase, gas phase and liquid phase. The solid phase is suspended solid particles and flocs produced by flocculation. The gas phase is gas produced by dissolved air flotation and electric flotation. The liquid phase is oil and foam liquid.

[0056] Turn on the air compressor, the first control valve, and the check valve. According to the process parameters for the treatment of oily fire-fighting wastewater and the readings of the air flow meter and the pressure gauge, adjust the flow rate of compressed air injected into the dissolved air tank, control the internal pressure and gas-liquid ratio of the dissolved air tank, and use the releaser to inject the dissolved air water generated in the dissolved air tank into the T-tube separator through the dissolved air water inlet port.

[0057] Due to the density difference between the solid phase, gas phase and liquid phase in the oily firefighting wastewater, the gas phase in the oily firefighting wastewater first moves to the upper horizontal pipe of the T-tube separator and is discharged through the gas-liquid-solid phase outflow end. Subsequently, the emulsified oil in the oil-liquid phase of the oily firefighting wastewater aggregates under the action of the demulsifier and air flotation, and is attached by microbubbles. Under the action of buoyancy, it rises and gathers to form suspended oil. The suspended oil is discharged through the gas-liquid-solid phase outflow end of the T-tube separator under the action of oil-water slip and inertial force.

[0058] The current density of the power supply is set according to the process parameters for treating the oily firefighting wastewater. The power supply is turned on so that each electrolysis electrode connected to the power supply is energized. The electrolysis electrode connected to the positive electrode of the power supply electrolyzes to produce transition metal ions for flocculation, thereby treating suspended solid particles and flocs in the solid phase of the oily firefighting wastewater. The electrolysis electrode connected to the negative electrode of the power supply is an inert electrode. During the electrolysis process, microbubbles are generated for deep treatment after dissolved air flotation. The diameter of the microbubbles is less than 50 μm. At the same time, the electrolysis electrodes oxidize and degrade the foam liquid around the electrolysis electrodes based on electrocatalytic oxidation. The oxidized and degraded foam liquid floats to the upper horizontal tube of the T-tube separator and is discharged through the gas-liquid-solid phase outflow end.

[0059] The suspended solid particles and flocs in the solid phase of the oily firefighting sewage are captured by the microbubbles. The suspended solid particles and flocs adhere to the surface of the microbubbles and float with the microbubbles to the upper horizontal tube of the T-tube separator, and are discharged through the gas-liquid-solid phase outflow end of the T-tube separator. The second control valve is opened to allow the treated oily firefighting sewage to flow out of the T-tube separator through the firefighting recycled water outflow end, thereby obtaining the treated oily firefighting sewage.

[0060] Preferably, during the emergency treatment and reuse process of the oily firefighting wastewater, the third control valve is opened to re-inject the treated oily firefighting wastewater into the dissolved air tank, and the treated oily firefighting wastewater is used to generate dissolved air water.

[0061] The present invention has the following beneficial effects:

[0062] (1) The present invention proposes an emergency treatment and reuse device for oily firefighting wastewater, which combines a pipeline separation method, an electrochemical method, a dissolved air flotation method, and a chemical dosing method to systematically treat oily firefighting wastewater, thereby achieving simultaneous separation of oil, solid particles, flocs, and foam in the oily firefighting wastewater. The emergency treatment and reuse device for oily firefighting wastewater proposed by the present invention has a compact structure, occupies a small area, is easy to manufacture in a skid-mounted manner, and is suitable for large-scale and rapid treatment of oily firefighting wastewater at accident sites.

[0063] (2) The present invention also proposes a method for emergency treatment and reuse of oily firefighting wastewater. According to the source of the oily firefighting wastewater and the purpose of the oily firefighting wastewater after treatment, combined with the electricity conditions at the site of emergency treatment and reuse of the oily firefighting wastewater, different oily firefighting wastewater treatment process parameters are set for different working conditions to form an emergency treatment process plan for oily firefighting wastewater, thereby realizing the treatment of oily firefighting wastewater under various working conditions and ensuring that the oily firefighting wastewater meets the treatment standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is a structural schematic diagram of the emergency treatment and reuse device for oily fire-fighting wastewater of the present invention.

[0065] In the figure, 1. T-tube separator, 11. upper horizontal pipe, 12. middle horizontal pipe, 13. lower horizontal pipe, 14. vertical pipe, 15. fire sewage inflow end, 16. fire recycled water outflow end, 17. gas-liquid-solid phase outflow end, 18. overflow collection tank, 2. power supply, 21. electrolysis electrode, 3. dissolved air tank, 31. safety valve, 32. pressure gauge, 33. liquid level gauge, 34. air compressor, 35. first control valve, 36. air flow meter, 37. check valve, 38. packing layer, 39. releaser, 4. stirring tank, 41. agitator, 42. feed pump, 43. feed flow meter, 51. second control valve, 52. liquid phase outlet flow meter, 53. third control valve, 54. reflux pump, 55 reflux flow meter. DETAILED DESCRIPTION

[0066] The application will be further described in detail below in combination with the drawings and specific embodiments:

[0067] Embodiment 1

[0068] The application provides an oil-containing fire-fighting sewage emergency treatment and recycling device, as shown in the drawings, comprising a stirring tank 4, a T-shaped pipe separator 1, a dissolved air tank 3 and an overflow collection tank 18. Figure 1

[0069] The T-shaped pipe separator 1 is provided with a fire-fighting sewage inflow end 15, a dissolved air water inflow end, a gas-liquid-solid phase outflow end 17 and a fire-fighting recycling water outflow end 16, the fire-fighting sewage inflow end 16 and the dissolved air water inflow end are arranged on the same side of the T-shaped pipe separator 1, and the gas-liquid-solid phase outflow end 17 and the fire-fighting recycling water outflow end 15 are arranged on the other side of the T-shaped pipe separator 1.

[0070] The fire-fighting sewage inflow end of the T-shaped pipe separator 1 is connected with the stirring tank 4 through a first pipeline, the first pipeline is provided with a feeding pump 42 near one side of the stirring tank 4 and a feeding flowmeter 43 near one side of the fire-fighting sewage inflow end 15 of the T-shaped pipe separator.

[0071] The stirring tank 4 is connected with an oil-containing fire-fighting sewage injection pipeline through a liquid inlet pipeline, and a stirrer 41 is arranged in the stirring tank 4 for uniformly stirring the oil-containing fire-fighting sewage and the feeding agent, and the volume V of the stirring tank is determined according to the injection amount of the oil-containing fire-fighting sewage and the premixing time of the selected demulsifier. 搅 .

[0072] The feeding agent comprises a demulsifier and a flocculant, the demulsifier is mainly used for gathering small-particle-size emulsified oil droplets in the oil-containing fire-fighting sewage into large-particle-size oil droplets, thereby reducing the difficulty of subsequent separation of the oil phase in the oil-containing fire-fighting sewage, and when there is a lack of power supply conditions or the electric flocculation treatment capacity is insufficient, the flocculant needs to be added to remove the foam liquid component in the oil-containing fire-fighting sewage.

[0073] The dissolved air water inflow end of the T-shaped pipe separator 1 is connected with the bottom of the dissolved air tank 3 through a second pipeline, and a releaser 39 is arranged at the connection end of the second pipeline and the T-shaped pipe separator 1.

[0074] The bottom of the dissolved air tank 3 is further provided with an air injection pipeline, and an air compressor 34, a first control valve 35, an air flowmeter 36 and a check valve 37 are sequentially arranged on the air injection pipeline, the air compressor 34 is arranged near the air inlet end of the air injection pipeline and is used for injecting compressed air into the air injection pipeline.

[0075] ​A pressure gauge 32 and a safety valve 31 are provided at the top of the gas dissolving tank 3. The pressure gauge 32 is used to measure the pressure inside the gas dissolving tank. The safety valve 31 is used to unload the pressure inside the gas dissolving tank. A liquid level gauge 33 is provided on the side wall of the gas dissolving tank 3 to measure the liquid level height inside the gas dissolving tank. A packing layer 38 is provided inside the gas dissolving tank 3. The packing layer 38 is filled with ball ring packing, porcelain Raschig ring packing, plastic step ring packing or corrugated packing to increase the gas dissolving efficiency of the gas dissolving tank.

[0076] The air in the air dissolving tank 3 dissolves in water under high pressure to form dissolved air water, which is then drawn out from the lower part of the air dissolving tank 3 and injected into the lower horizontal tube of the T-tube separator through a releaser. The saturated dissolved air water is decompressed in the T-tube separator by the releaser to release stable and uniform microbubbles with a diameter of 100 μm.

[0077] The gas-liquid-solid phase outflow end 17 of the T-tube separator is connected to an overflow collection tank 18, which is used to discharge the hydrogen generated by electrolysis in the T-tube separator and to collect the oil phase, flocs, solid particles and foam flowing out of the gas-liquid-solid phase outflow end 17 of the T-tube separator.

[0078] The fire-fighting recycled water outflow end 16 of the T-tube separator is connected to the inflow end of the third pipeline. The third pipeline is sequentially provided with a second control valve 51 and a liquid phase outlet flowmeter 52. The second control valve 51 is close to the inflow end of the third pipeline. The outflow end of the third pipeline is divided into two paths, one of which is connected to the external water pipeline through the fourth pipeline, and the other is connected to the top of the dissolved air tank 3 through the fifth pipeline. The fifth pipeline is sequentially provided with a third control valve 53, a reflux pump 54 and a reflux flowmeter 55. The third control valve 53 is close to the injection end of the fifth pipeline.

[0079] In this embodiment, the T-tube separator 1 includes a horizontal pipe section and a vertical pipe section, wherein the horizontal pipe section includes an upper horizontal pipe 11 , a middle horizontal pipe 12 and a lower horizontal pipe 13 , and the vertical pipe section includes a plurality of vertical pipes 14 .

[0080] One end of the upper horizontal pipe 11 is blocked, and the other end is set as the gas-liquid-solid phase outflow end 17; one end of the middle horizontal pipe 12 is set as the fire sewage inflow end 15, and the other end is blocked; one end of the lower horizontal pipe 13 is set as the dissolved air water inflow end, and the other end is set as the fire recycled water outflow end 16; the upper horizontal pipe 11, the middle horizontal pipe 12 and the lower horizontal pipe 13 are connected in the vertical direction through multiple vertical pipes 14.

[0081] The vertical tubes 14 are evenly distributed on the middle horizontal tube 12, and the intervals between adjacent vertical tubes 14 are the same. The vertical tubes 14 pass through the middle horizontal tube 12, and the top ends extend into the upper horizontal tube 11, and the bottom ends extend into the lower horizontal tube 13, connecting the upper horizontal tube 11, the middle horizontal tube 12 and the lower horizontal tube 13 in the vertical direction through the vertical tubes 14.

[0082] The T-tube separator proposed in this invention dynamically separates oily firefighting wastewater by utilizing the principles of oil-water slip and inertial force. Under the influence of gravity and buoyancy, the light oil phase flows through the vertical tubes and is collected from the middle horizontal tube to the upper horizontal tube. Simultaneously, the water phase in the upper horizontal tube sinks through the vertical tubes into the middle horizontal tube. To prevent incomplete oil phase separation, the liquid phase outlet of the T-tube separator is located at the end of the lower horizontal tube. This downward diversion of the liquid phase reduces oil entrainment and improves separation accuracy.

[0083] In order to achieve large-scale treatment of oily firefighting sewage while ensuring the separation effect of the T-tube separator, the present invention sets the diameters D of the upper horizontal pipe, the middle horizontal pipe, and the lower horizontal pipe in the horizontal pipe section of the T-tube separator to the same size. The diameter of the horizontal pipe section in the T-tube separator is determined according to the injection amount and injection flow rate of the oily firefighting sewage, as shown in formula (1):

[0084]

[0085] Where,

[0086] Q—injection volume of oily firefighting sewage;

[0087] D—pipe diameter;

[0088] V—Injection velocity of oily fire-fighting sewage.

[0089] The diameter of the vertical tube in the vertical tube section, the height of the vertical tube, and the spacing between adjacent vertical tubes are set according to the diameter D of the horizontal tube section in the T-tube separator. The diameter of the vertical tube is set to 0.5D, the height of the vertical tube is set to 10D, and the spacing between adjacent vertical tubes is set to 20D.

[0090] The present invention reduces the size of the T-tube separator by providing design parameters for the horizontal and vertical pipe sections in the T-tube separator, thereby solving the problem that the T-tube separator cannot be processed and manufactured into a skid-mounted device due to its excessive size. The invention is more suitable for treating oily firefighting wastewater at accident sites.

[0091] Furthermore, when the amount of oily firefighting sewage that needs to be treated is large, multiple T-tube separators can be set in the oily firefighting sewage emergency treatment and reuse device proposed in the present invention. By connecting the T-tube separators in parallel with each other through pipes, multiple T-tube separators can be used to treat the oily firefighting sewage at the same time, which not only improves the treatment efficiency of the oily firefighting sewage, but also takes into account the treatment volume of the oily firefighting sewage.

[0092] Each vertical tube of the T-tube separator of the present invention is provided with an electrolysis electrode 21. Electrolysis is performed by the electrolysis electrode 21 to improve the oil-water separation efficiency and the processing capacity of electrocoagulation, electrooxidation, and electroflotation. The electrolysis electrode 21 is located between the middle horizontal tube 12 and the lower horizontal tube 13. The total number of electrolysis electrodes 21 is an even number. The length of the electrolysis electrode is equal to the vertical spacing between the middle horizontal tube and the lower horizontal tube. Each electrolysis electrode is connected in parallel with the power supply 2. Some electrolysis electrodes are connected to the positive electrode of the power supply, while others are connected to the negative electrode of the power supply. The number of electrolysis electrodes connected to the positive electrode of the power supply is equal to the number of electrolysis electrodes connected to the negative electrode of the power supply, and both are half of the total number of electrolysis electrodes. Among them, the electrolysis electrode near the fire sewage inflow end of the T-tube separator is made of a transition metal material and is connected to the positive electrode of the power supply. The electrolysis electrode near the fire recycled water outflow end of the T-tube separator is an inert electrode and is connected to the negative electrode of the power supply.

[0093] In the present invention, the number of vertical tubes in the T-tube separator is set according to the injection amount of oily firefighting sewage, that is, the number of electrolytic electrodes in the T-tube separator is set. The specific setting parameters are:

[0094] When the injection volume Q of oily firefighting sewage does not exceed 50m 3 / h, the number of vertical tubes in the T-tube separator is set to 4, and 4 electrolysis electrodes are set, 2 electrolysis electrodes are transition metal electrodes, and 2 electrolysis electrodes are inert electrodes, wherein the transition metal electrodes are respectively connected to the positive electrode of the power supply, and the inert electrodes are respectively connected to the negative electrode of the power supply.

[0095] When the injection volume Q of oily firefighting sewage is greater than 50m 3 / h and not more than 100m 3 / h, the number of vertical tubes in the T-tube separator is set to 6, and 6 electrolysis electrodes are set, 3 electrolysis electrodes are transition metal electrodes, and 3 electrolysis electrodes are inert electrodes, wherein the transition metal electrodes are respectively connected to the positive electrode of the power supply, and the inert electrodes are respectively connected to the negative electrode of the power supply.

[0096] When the injection volume Q of oily firefighting sewage is greater than 100m 3 / h and not more than 200m 3 / h, the number of vertical tubes in the T-tube separator is set to 8, and 8 electrolysis electrodes are set, 4 of which are transition metal electrodes and 4 are inert electrodes, wherein the transition metal electrodes are respectively connected to the positive pole of the power supply and the inert electrodes are respectively connected to the negative pole of the power supply.

[0097] In the front half of the T-tube separator of the present invention, the oil phase and foam liquid adhere to the surface of microbubbles generated by dissolved air water to form flocs, which are accelerated to float to the upper horizontal tube of the T-tube separator as the buoyancy increases. In addition, the hydrophobic ends of the foam liquid component molecules are firmly combined with the bubbles, which not only enhances the stability of the bubble floating, but also plays a role in physical separation. At the same time, during the floating process, the bubbles will also capture solid particles suspended in the oily fire-fighting sewage, thereby realizing the separation of the oil phase, foam liquid and solid particles in the oily fire-fighting sewage.

[0098] In the present invention, the electrolysis is carried out by energizing the electrolysis electrodes. During the electrolysis process, the Fe 2+ and OH - The inert electrode has a flocculating effect, bringing the positive and negative ions dissolved in the foam liquid in the oily firefighting wastewater into close proximity, lowering its electrical potential. This destabilizes the colloid, causing it to collide and condense to form flocs, which then precipitate from the oily firefighting wastewater. These flocs adhere to the surface of microbubbles and float upward with them, exiting the gas-liquid-solid outflow port of the T-tube separator. Simultaneously, intermediate products produced on the surface of the electrolytic electrode, connected to the positive pole of the power supply, also have a certain oxidative degradation effect on the foam liquid, effectively removing the foam liquid component from the oily firefighting wastewater. The inert electrode generates microbubbles during power-on. These are hydrogen bubbles with a diameter of 20 μm, far smaller than the diameter of bubbles produced by conventional dissolved air flotation (100 μm) and distributed air flotation (1000 μm), thus improving the removal of emulsified oil, particulate matter, and flocs from the oily firefighting wastewater. Furthermore, the inert electrode is positioned in the rear half of the T-tube separator, further finely separating the emulsified oil, particulate matter, and flocs from the oily firefighting wastewater.

[0099] The power supply in the present invention adopts a vehicle-mounted power supply or an external power supply. The current intensity density of the power supply directly affects the treatment capacity of the T-tube separator for oily firefighting sewage. The more the treatment volume of oily firefighting sewage, the more impurities need to be treated, and the higher the current intensity required. Therefore, the present invention sets the current intensity density of the power supply to 1-2000A / m according to the treatment volume of oily firefighting sewage and the on-site power supply conditions. 2 .

[0100] Example 2

[0101] The invention provides an emergency treatment and reuse device for oily fire-fighting sewage, which comprises a stirring tank, a T-tube separator, an air dissolving tank and an overflow collecting tank.

[0102] The T-tube separator is provided with a fire sewage inlet end, a dissolved air water inlet end, a gas-liquid-solid phase outflow end and a fire reuse water outflow end. The fire sewage inlet end and the dissolved air water inflow end are arranged on the same side of the T-tube separator, and the gas-liquid-solid phase outflow end and the fire reuse water outflow end are arranged on the other side of the T-tube separator.

[0103] The fire sewage inflow end of the T-tube separator is connected to the stirring tank through a first pipeline. A feed pump is provided on the side of the first pipeline close to the stirring tank, and a feed flow meter is provided on the side close to the fire sewage inflow end of the T-tube separator.

[0104] The stirring tank is connected to the oily firefighting sewage injection pipeline through the liquid inlet pipeline. A stirrer is provided in the stirring tank for uniformly stirring the oily firefighting sewage and the input agent. The volume of the stirring tank is V 搅 Set to 5m 3 , the premix demulsification time is 3 minutes.

[0105] The input agents include demulsifiers and flocculants, with the input agents being mainly demulsifiers. The demulsifiers are used to aggregate small-particle emulsified oil droplets dispersed in the oil-containing fire-fighting sewage into large-particle oil droplets, thereby reducing the difficulty of subsequent separation of the oil phase in the oil-containing fire-fighting sewage. At the same time, when there is a lack of power supply conditions on site or the electric flocculation treatment capacity is insufficient, flocculants need to be added to use the flocculants to remove the foam liquid component in the oil-containing fire-fighting sewage.

[0106] The dissolved air water inflow end of the T-tube separator is connected to the bottom of the dissolved air tank through a second pipeline. A releaser is provided at the connection end between the second pipeline and the T-tube separator. The releaser is set as a TS-type releaser.

[0107] An air injection pipeline is also provided at the bottom of the air dissolving tank, and an air compressor, a first control valve, an air flow meter and a check valve are sequentially provided on the air injection pipeline. The air compressor is arranged near the air inlet end of the air injection pipeline to inject compressed air into the air injection pipeline.

[0108] A pressure gauge and a safety valve are provided on the top of the air dissolving tank. The pressure gauge is used to measure the pressure inside the air dissolving tank. The safety valve is used to unload the pressure inside the air dissolving tank. A liquid level gauge is provided on the side wall of the air dissolving tank to measure the liquid level height inside the air dissolving tank. A packing layer is provided inside the air dissolving tank. The packing layer is filled with ball ring packing to increase the air dissolving efficiency of the air dissolving tank.

[0109] The air in the air dissolving tank dissolves in water under high pressure to form dissolved air water, which is then drawn out from the lower part of the air dissolving tank and injected into the lower horizontal tube of the T-tube separator through a releaser. The saturated dissolved air water is decompressed in the T-tube separator by the releaser to release stable and uniform microbubbles with a diameter of 100 μm.

[0110] The gas-liquid-solid phase outflow end of the T-tube separator is connected to an overflow collection tank, which is used to discharge hydrogen generated by electrolysis in the T-tube separator and to collect oil phase, flocs, solid particles and foam flowing out of the gas-liquid-solid phase outflow end of the T-tube separator.

[0111] The fire-fighting recycled water outflow end of the T-tube separator is connected to the inflow end of the third pipeline. The second control valve and the liquid phase outlet flowmeter are sequentially arranged on the third pipeline. The second control valve is close to the inflow end of the third pipeline. The outflow end of the third pipeline is divided into two paths, one of which is connected to the external water pipeline through the fourth pipeline, and the other is connected to the top of the dissolved air tank through the fifth pipeline. The third control valve, reflux pump and reflux flowmeter are sequentially arranged on the fifth pipeline. The third control valve is close to the injection end of the fifth pipeline.

[0112] In this embodiment, the T-tube separator includes a horizontal pipe section and a vertical pipe section, wherein the horizontal pipe section includes an upper horizontal pipe, a middle horizontal pipe and a lower horizontal pipe, and the vertical pipe section includes a plurality of vertical pipes.

[0113] One end of the upper horizontal pipe is blocked, and the other end is set as the gas-liquid-solid phase outflow end; one end of the middle horizontal pipe is set as the fire sewage inflow end, and the other end is blocked; one end of the lower horizontal pipe is set as the dissolved air water inflow end, and the other end is set as the fire recycled water outflow end; the upper horizontal pipe, the middle horizontal pipe and the lower horizontal pipe are connected in the vertical direction through multiple vertical pipes.

[0114] The vertical tubes are evenly distributed on the middle horizontal tube, and the intervals between adjacent vertical tubes are the same. The vertical tubes pass through the middle horizontal tube, and the top ends extend into the upper horizontal tube and the bottom ends extend into the lower horizontal tube, connecting the upper horizontal tube, the middle horizontal tube and the lower horizontal tube in the vertical direction.

[0115] The T-tube separator proposed in this invention dynamically separates oily firefighting wastewater by utilizing the principles of oil-water slip and inertial force. Under the influence of gravity and buoyancy, the light oil phase flows through the vertical tubes and is collected from the middle horizontal tube to the upper horizontal tube. Simultaneously, the water phase in the upper horizontal tube sinks through the vertical tubes into the middle horizontal tube. To prevent incomplete oil phase separation, the liquid phase outlet of the T-tube separator is located at the end of the lower horizontal tube. This downward diversion of the liquid phase reduces oil entrainment and improves separation accuracy.

[0116] In order to achieve large-scale treatment of oily firefighting sewage while ensuring the separation effect of the T-tube separator, the injection volume Q of the oily firefighting sewage is 100m 3 / h, the injection flow rate V of oily fire-fighting sewage is 1m / s, and the diameters D of the upper horizontal tube, middle horizontal tube and lower horizontal tube in the T-tube separator are all set to 0.188m. There are 6 vertical tubes in the T-tube separator, and an electrolysis electrode is set in each vertical tube. The electrolysis electrode is located between the middle horizontal tube and the lower horizontal tube, and the length of the electrolysis electrode is equal to the vertical distance between the middle horizontal tube and the lower horizontal tube.

[0117] In this embodiment, the three electrolysis electrodes close to the fire sewage inflow end of the T-tube separator are all transition metal electrodes, which are connected to the positive pole of the power supply. The other three electrolysis electrodes close to the fire recycled water outflow end of the T-tube separator are all inert electrodes, which are connected to the negative pole of the power supply.

[0118] In the front half of the T-tube separator of the present invention, the oil phase and foam liquid adhere to the surface of microbubbles generated by dissolved air water to form flocs, which are accelerated to float to the upper horizontal tube of the T-tube separator as the buoyancy increases. In addition, the hydrophobic ends of the foam liquid component molecules are firmly combined with the bubbles, which not only enhances the stability of the bubble floating, but also plays a role in physical separation. At the same time, during the floating process, the bubbles will also capture solid particles suspended in the oily fire-fighting sewage, thereby realizing the separation of the oil phase, foam liquid and solid particles in the oily fire-fighting sewage.

[0119] In the present invention, the electrolysis is carried out by energizing the electrolysis electrodes. During the electrolysis process, the Fe 2+ and OH - The inert electrode has a flocculating effect, bringing the positive and negative ions dissolved in the foam liquid in the oily firefighting wastewater into close proximity, lowering its electrical potential. This destabilizes the colloid, causing it to collide and condense to form flocs, which then precipitate from the oily firefighting wastewater. These flocs adhere to the surface of microbubbles and float upward with them, exiting the gas-liquid-solid outflow port of the T-tube separator. Simultaneously, intermediate products produced on the surface of the electrolytic electrode, connected to the positive pole of the power supply, also have a certain oxidative degradation effect on the foam liquid, effectively removing the foam liquid component from the oily firefighting wastewater. The inert electrode generates microbubbles during power-on. These are hydrogen bubbles with a diameter of 20 μm, far smaller than the diameter of bubbles produced by conventional dissolved air flotation (100 μm) and distributed air flotation (1000 μm), thus improving the removal of emulsified oil, particulate matter, and flocs from the oily firefighting wastewater. Furthermore, the inert electrode is positioned in the rear half of the T-tube separator, further finely separating the emulsified oil, particulate matter, and flocs from the oily firefighting wastewater.

[0120] The power supply in the present invention adopts a vehicle-mounted power supply or an external power supply. The current density of the power supply directly affects the treatment capacity of the T-tube separator for oily firefighting sewage. The more the treatment volume of oily firefighting sewage, the more impurities need to be treated, and the higher the current density required. Therefore, according to the treatment volume of oily firefighting sewage and the on-site power supply conditions, the current density of the power supply is set to 2000A / m 2 .

[0121] Example 3

[0122] The invention provides an emergency treatment and reuse device for oily fire-fighting sewage, which comprises a stirring tank, a T-tube separator, an air dissolving tank and an overflow collecting tank.

[0123] The T-tube separator is provided with a fire sewage inlet end, a dissolved air water inlet end, a gas-liquid-solid phase outflow end and a fire reuse water outflow end. The fire sewage inlet end and the dissolved air water inflow end are arranged on the same side of the T-tube separator, and the gas-liquid-solid phase outflow end and the fire reuse water outflow end are arranged on the other side of the T-tube separator.

[0124] The fire sewage inflow end of the T-tube separator is connected to the stirring tank through a first pipeline. A feed pump is provided on the side of the first pipeline close to the stirring tank, and a feed flow meter is provided on the side close to the fire sewage inflow end of the T-tube separator.

[0125] The stirring tank is connected to the oily firefighting sewage injection pipeline through the liquid inlet pipeline. A stirrer is provided in the stirring tank for uniformly stirring the oily firefighting sewage and the input agent. The volume of the stirring tank is V 搅 Set to 5m 3 .

[0126] The input agents include demulsifiers and flocculants, with the input agents being mainly demulsifiers. The demulsifiers are used to aggregate small-particle emulsified oil droplets dispersed in the oil-containing fire-fighting sewage into large-particle oil droplets, thereby reducing the difficulty of subsequent separation of the oil phase in the oil-containing fire-fighting sewage. At the same time, when there is a lack of power supply conditions on site or the electric flocculation treatment capacity is insufficient, flocculants need to be added to use the flocculants to remove the foam liquid component in the oil-containing fire-fighting sewage.

[0127] The dissolved air water inflow end of the T-tube separator is connected to the bottom of the dissolved air tank through a second pipeline. A releaser is provided at the connection end between the second pipeline and the T-tube separator. The releaser is set as a TS-type releaser.

[0128] An air injection pipeline is also provided at the bottom of the air dissolving tank, and an air compressor, a first control valve, an air flow meter and a check valve are sequentially provided on the air injection pipeline. The air compressor is arranged near the air inlet end of the air injection pipeline to inject compressed air into the air injection pipeline.

[0129] A pressure gauge and a safety valve are provided on the top of the air dissolving tank. The pressure gauge is used to measure the pressure inside the air dissolving tank. The safety valve is used to unload the pressure inside the air dissolving tank. A liquid level gauge is provided on the side wall of the air dissolving tank to measure the liquid level height inside the air dissolving tank. A packing layer is provided inside the air dissolving tank. The packing layer is filled with ball ring packing to increase the air dissolving efficiency of the air dissolving tank.

[0130] The air in the air dissolving tank dissolves in water under high pressure to form dissolved air water, which is then drawn out from the lower part of the air dissolving tank and injected into the lower horizontal tube of the T-tube separator through a releaser. The saturated dissolved air water is decompressed in the T-tube separator by the releaser to release stable and uniform microbubbles with a diameter of 100 μm.

[0131] The gas-liquid-solid phase outflow end of the T-tube separator is connected to an overflow collection tank, which is used to discharge hydrogen generated by electrolysis in the T-tube separator and to collect oil phase, flocs, solid particles and foam flowing out of the gas-liquid-solid phase outflow end of the T-tube separator.

[0132] The fire-fighting recycled water outflow end of the T-tube separator is connected to the inflow end of the third pipeline. The second control valve and the liquid phase outlet flowmeter are sequentially arranged on the third pipeline. The second control valve is close to the inflow end of the third pipeline. The outflow end of the third pipeline is divided into two paths, one of which is connected to the external water pipeline through the fourth pipeline, and the other is connected to the top of the dissolved air tank through the fifth pipeline. The third control valve, reflux pump and reflux flowmeter are sequentially arranged on the fifth pipeline. The third control valve is close to the injection end of the fifth pipeline.

[0133] In this embodiment, the T-tube separator includes a horizontal pipe section and a vertical pipe section, wherein the horizontal pipe section includes an upper horizontal pipe, a middle horizontal pipe and a lower horizontal pipe, and the vertical pipe section includes a plurality of vertical pipes.

[0134] One end of the upper horizontal pipe is blocked, and the other end is set as the gas-liquid-solid phase outflow end; one end of the middle horizontal pipe is set as the fire sewage inflow end, and the other end is blocked; one end of the lower horizontal pipe is set as the dissolved air water inflow end, and the other end is set as the fire recycled water outflow end; the upper horizontal pipe, the middle horizontal pipe and the lower horizontal pipe are connected in the vertical direction through multiple vertical pipes.

[0135] The vertical tubes are evenly distributed on the middle horizontal tube, and the intervals between adjacent vertical tubes are the same. The vertical tubes pass through the middle horizontal tube, and the top ends extend into the upper horizontal tube and the bottom ends extend into the lower horizontal tube, connecting the upper horizontal tube, the middle horizontal tube and the lower horizontal tube in the vertical direction.

[0136] The T-shaped pipe separator provided in the application utilizes the oil-water slip and inertial force principle to perform dynamic separation on the oily fire-fighting sewage, under the action of gravity and buoyancy, the light oil phase is collected to the upper horizontal pipe from the middle horizontal pipe through the vertical pipe, and the water phase in the upper horizontal pipe sinks to the middle horizontal pipe through the vertical pipe. In order to prevent the incomplete separation of the oil phase, the liquid phase outlet of the T-shaped pipe separator is arranged at one end of the lower horizontal pipe, the downward flow of the liquid phase is discharged, the entrainment of the oil phase is reduced, and the separation precision is improved.

[0137] In order to realize the large-batch treatment of the oily fire-fighting sewage while ensuring the separation effect of the T-shaped pipe separator, according to the injection amount Q of the oily fire-fighting sewage being 200 m 3 / h, the injection flow rate V of the oily fire-fighting sewage being 0.5 m / s, the pipe diameter D of the upper horizontal pipe, the middle horizontal pipe and the lower horizontal pipe in the T-shaped pipe separator is determined to be 0.217 m, the overall size of the T-shaped pipe separator is 27.3 m*5 m, and the T-shaped pipe separator can be processed into a vehicle-mounted pry-mounted equipment. Six vertical pipes are arranged in the T-shaped pipe separator, and an electrolytic electrode is arranged in each vertical pipe. The electrolytic electrode is located between the middle horizontal pipe and the lower horizontal pipe, and the length of the electrolytic electrode is equal to the interval of the middle horizontal pipe and the lower horizontal pipe in the vertical direction.

[0138] In the embodiment, three electrolytic electrodes close to one side of the fire-fighting sewage inflow end of the T-shaped pipe separator among the six electrolytic electrodes are transition metal electrodes, and are connected to the positive pole of the power supply. The other three electrolytic electrodes close to one side of the fire-fighting sewage outflow end of the T-shaped pipe separator are inert electrodes, and are connected to the negative pole of the power supply.

[0139] In the first half of the T-shaped pipe separator, the oil phase and the foam liquid adhere to the surface of the micro-bubbles generated by the dissolved air water to form flocculation, and float to the upper horizontal pipe of the T-shaped pipe separator at an accelerated speed with the increase of the buoyancy. In addition, the hydrophobic end of the foam liquid component molecule is firmly combined with the bubbles, which not only enhances the stability of the bubble floating, but also plays a physical separation role. At the same time, the bubbles also capture the solid particles suspended in the oily fire-fighting sewage during the floating process, so as to separate the oil phase, the foam liquid and the solid particles in the oily fire-fighting sewage.

[0140] In the application, electrolysis is performed by electrifying the electrolytic electrode. During the electrolysis process, the transition metal electrode generates Fe 2+ and OH -The foam liquid dissolved in the oil-containing fire-fighting sewage is close to positive and negative ions, the potential is reduced, the colloid is destabilized, and the flocculation is formed by collision and coagulation, and is separated from the oil-containing fire-fighting sewage, and is attached to the surface of the micro-bubble and floats up with the micro-bubble, and is discharged from the gas-liquid-solid phase outlet of the T-shaped tube separator, and the intermediate product generated on the surface of the electrolytic electrode connected to the positive electrode of the power supply also has a certain oxidative degradation effect on the foam liquid, so that the foam liquid component in the oil-containing fire-fighting sewage is effectively removed. The inert electrode generates micro-bubbles in the process of electrification, and the micro-bubbles are hydrogen bubbles with a diameter of 20 microns, which is much smaller than the diameters of the bubbles generated by the general dissolved air flotation method (100 microns) and the air distribution type flotation method (1000 microns), which is beneficial to improve the removal effect of emulsified oil, particulate matter and flocculation in the oil-containing fire-fighting sewage. Moreover, the inert electrode is arranged in the latter half of the T-shaped tube separator in the present application, which has the effect of further fine separation of emulsified oil, particulate matter and flocculation in the oil-containing fire-fighting sewage.

[0141] In the present application, the power supply adopts a vehicle-mounted power supply or an external power supply, and the current intensity density of the power supply directly affects the treatment capacity of the T-shaped tube separator for the oil-containing fire-fighting sewage. The more the treatment capacity of the oil-containing fire-fighting sewage is, the more the impurity content to be treated is, and the higher the required current intensity is. Therefore, according to the treatment capacity of the oil-containing fire-fighting sewage and the on-site power supply condition, the current intensity density of the power supply is set to 1000A / m 2 .

[0142] Example 4

[0143] The present application provides an oil-containing fire-fighting sewage emergency treatment and recycling method, which adopts the oil-containing fire-fighting sewage emergency treatment and recycling device described in Example 2, and specifically includes the following steps:

[0144] Step 1, according to the source of the oil-containing fire-fighting sewage and the use of the oil-containing fire-fighting sewage after treatment, and combining the water quality test results of the oil-containing fire-fighting sewage, the treatment standard of the oil-containing fire-fighting sewage is determined.

[0145] If the use of the oil-containing fire-fighting sewage after treatment is fire extinguishing water, the oil-containing fire-fighting sewage emergency treatment and recycling device is used to deeply separate the oil and foam liquid in the oil-containing fire-fighting sewage, so that the content of the oil in the treated oil-containing fire-fighting sewage is less than 50mg / L, and the content of the foam liquid surfactant is less than 10mg / L; if the use of the oil-containing fire-fighting sewage after treatment is cooling water, the oil-containing fire-fighting sewage emergency treatment and recycling device is used to separate the oil in the oil-containing fire-fighting sewage, so that the content of the oil in the treated oil-containing fire-fighting sewage is less than 100mg / L.

[0146] Step 2, according to the source of the oil-containing fire-fighting sewage, the use and the power supply condition of the oil-containing fire-fighting sewage emergency treatment and recycling treatment site, the oil-containing fire-fighting sewage treatment process parameters are determined, and the oil-containing fire-fighting sewage emergency treatment process scheme is formed.

[0147] The process parameters for oily fire-fighting wastewater treatment include demulsifier dosage, flocculant dosage, T-tube separator diversion ratio and reflux ratio, internal pressure and gas-liquid ratio of the dissolved air tank, and current density of the power supply.

[0148] Among them, the dosage of demulsifier is determined according to the different oil concentrations of wastewater and different treatment requirements. The dosage range of demulsifier and flocculant is determined by conducting experiments, and adjusted according to actual working conditions. The dosage range of demulsifier is set to 20-50mg / L and the dosage of flocculant is set to 100-250mg / L.

[0149] The split ratio of the T-tube separator is the ratio of the flow rate of the fire recycling water outflow end of the T-tube separator to the flow rate of the fire sewage inflow end. The lower the split ratio, the better the treatment effect of the oily fire sewage. In this embodiment, the split ratio range of the T-tube separator is set to 0.80-0.95. The reflux ratio of the T-tube separator is the ratio of the flotation water flow rate of the dissolved air flotation to the flow rate of the fire recycling water outflow end of the T-tube separator. The higher the reflux ratio, the more flotation water there is, which indicates a better treatment effect of the oily fire sewage. In this embodiment, the reflux ratio of the T-tube separator is set to 0.05-0.2.

[0150] The internal pressure of the dissolved air tank is also called the dissolved air pressure. Within a certain range, the greater the dissolved air pressure, the more dissolved air there is and the better the flotation effect. In this embodiment, the internal pressure of the dissolved air tank is set to 0.2-0.4Mpa. The gas-liquid ratio of the dissolved air tank is the ratio of the flow rate of air entering the dissolved air tank to the flow rate of flotation water. In this embodiment, the gas-liquid ratio of the dissolved air tank is set to 0.03-0.06.

[0151] At the same time, the higher the current density of the power supply, the stronger the electric floatation, electric flocculation and electrocatalytic oxidation capabilities, and the better the treatment effect of oily firefighting sewage. In this embodiment, the current density of the power supply is set to 2000A / m 2 .

[0152] Step 3: According to the emergency treatment process plan for oily fire-fighting wastewater, the oily fire-fighting wastewater is emergency treated using the oily fire-fighting wastewater emergency treatment and reuse device, and the emergency treatment process plan for oily fire-fighting wastewater is dynamically adjusted during the emergency treatment process to obtain treated oily fire-fighting wastewater.

[0153] The oily firefighting sewage emergency treatment and reuse device is used to treat the oily firefighting sewage. The specific treatment process is as follows:

[0154] The oily fire-fighting sewage is injected into the stirring tank, and the demulsifier and flocculant are added and stirred evenly, and then injected into the T-tube separator through the fire-fighting sewage inlet end of the T-tube separator. At this time, there are three phases in the oily fire-fighting sewage: solid phase, gas phase and liquid phase. The solid phase is suspended solid particles and flocs produced by flocculation, the gas phase is gas produced by dissolved air flotation and electric flotation, and the liquid phase is oil and foam liquid.

[0155] Turn on the air compressor, the first control valve and the check valve, and adjust the flow rate of compressed air injected into the dissolved air tank according to the process parameters of the oily fire wastewater treatment and the indications of the air flow meter and the pressure gauge, control the internal pressure and gas-liquid ratio of the dissolved air tank, and use the releaser to inject the dissolved air water generated in the dissolved air tank into the T-tube separator through the dissolved air water inlet end.

[0156] Due to the density difference between the solid phase, gas phase and liquid phase in the oily fire-fighting sewage, the gas phase in the oily fire-fighting sewage first moves to the upper horizontal tube of the T-tube separator and is discharged through the gas-liquid-solid phase outflow end. Subsequently, the emulsified oil in the oil-liquid phase of the oily fire-fighting sewage aggregates under the action of the demulsifier and flotation and is attached by microbubbles. Under the action of buoyancy, it rises and converges to form suspended oil. The suspended oil is discharged through the gas-liquid-solid phase outflow end of the T-tube separator under the action of oil-water slip and inertial force.

[0157] The current density of the power supply is set according to the process parameters for the treatment of oily firefighting wastewater. The power supply is turned on so that the electrolysis electrodes connected to the power supply are energized. The electrolysis electrode connected to the positive electrode of the power supply electrolyzes to produce transition metal ions for flocculation, and treats the suspended solid particles and flocs in the solid phase of the oily firefighting wastewater. The electrolysis electrode connected to the negative electrode of the power supply is an inert electrode. Microbubbles are generated during the electrolysis process for deep treatment after dissolved air flotation. The diameter of the microbubbles is less than 50 μm. At the same time, the electrolysis electrode oxidizes and degrades the foam liquid around the electrolysis electrode based on electrocatalytic oxidation. The foam liquid after oxidation and degradation floats to the upper horizontal tube of the T-tube separator and is discharged through the gas-liquid-solid phase outflow end.

[0158] Finally, the suspended solid particles and flocs in the solid phase of the oily firefighting sewage are captured by the microbubbles. The suspended solid particles and flocs adhere to the surface of the microbubbles and float up with the microbubbles to the upper horizontal tube of the T-tube separator and are discharged through the gas-liquid-solid phase outflow end of the T-tube separator.

[0159] Example 5

[0160] This embodiment adopts the oily firefighting wastewater emergency treatment and reuse device described in Example 2, and based on the oily firefighting wastewater emergency treatment and reuse method proposed in Example 4, forms an oily firefighting wastewater emergency treatment process plan for the first working condition.

[0161] The first working condition is that the oily fire-fighting wastewater is urgently treated and reused for fire fighting and the site has electricity conditions.

[0162] In this embodiment, for the first working condition, since the content of pollutants in the oily fire-fighting wastewater is high, the production volume is low, and the purity requirement for fire-fighting water is high and the demand is low, the sewage treatment degree is required to be high, the emergency treatment process scheme of the oily fire-fighting wastewater adopted is: adding an appropriate amount of flocculant and demulsifier to the stirring tank, setting the split ratio of the T-tube separator to 0.80-0.85, the reflux ratio of the T-tube separator to 0.15-0.2, the internal pressure of the dissolved air tank to 0.35-0.4Mpa, the gas-liquid ratio of the dissolved air tank to 0.05-0.06, and the current density of the power supply to 1500-2000A / m 2 .

[0163] Example 6

[0164] This embodiment adopts the oily firefighting wastewater emergency treatment and reuse device described in Example 2, and based on the oily firefighting wastewater emergency treatment and reuse method proposed in Example 4, forms an oily firefighting wastewater emergency treatment process plan for the second working condition.

[0165] The second working condition is that the oily fire-fighting wastewater is urgently treated and reused for fire fighting and there is no electricity on site.

[0166] In this embodiment, for the second working condition, since the content of pollutants in the oily fire-fighting wastewater is high, the production volume is low, and the purity requirement for fire-fighting water is high and the demand is low, the sewage treatment degree is required to be high, but the electrochemical method cannot be used. The emergency treatment process scheme of the oily fire-fighting wastewater adopted is: increase the input amount of flocculant and demulsifier in the stirring tank, set the split ratio of the T-tube separator to 0.80-0.85, set the reflux ratio of the T-tube separator to 0.15-0.2, set the internal pressure of the dissolved air tank to 0.35-0.4Mpa, and set the gas-liquid ratio of the dissolved air tank to 0.05-0.06.

[0167] Example 7

[0168] This embodiment adopts the oily firefighting wastewater emergency treatment and reuse device described in Example 2, and based on the oily firefighting wastewater emergency treatment and reuse method proposed in Example 4, forms an oily firefighting wastewater emergency treatment process plan for the third working condition.

[0169] The third working condition is that the oily firefighting wastewater is urgently treated and reused for cooling and the site has electricity conditions.

[0170] In this embodiment, for the third working condition, since the content of pollutants in the oily fire-fighting sewage is high, the production volume is low, and the purity requirement for cooling water is low and the demand is high, the sewage treatment degree requirement is low and the treatment volume requirement is high, the emergency treatment process scheme for oily fire-fighting sewage adopted is: adding an appropriate amount of flocculant and demulsifier to the stirring tank, setting the split ratio of the T-tube separator to 0.85-0.90, the reflux ratio of the T-tube separator to 0.1-0.15, the internal pressure of the dissolved air tank to 0.25-0.35Mpa, the gas-liquid ratio of the dissolved air tank to 0.04-0.05, and the current density of the power supply to 1000-1500A / m 2 .

[0171] Example 8

[0172] This embodiment adopts the oily firefighting wastewater emergency treatment and reuse device described in Example 2, and based on the oily firefighting wastewater emergency treatment and reuse method proposed in Example 4, forms an oily firefighting wastewater emergency treatment process plan for the fourth working condition.

[0173] The fourth working condition is that the oily firefighting wastewater is urgently treated and reused for cooling and there is no electricity condition on site.

[0174] In this embodiment, for the fourth working condition, since the content of pollutants in the oily fire-fighting wastewater is high, the production volume is low, and the purity requirement for cooling water is low and the demand is high, the sewage treatment degree requirement is low and the treatment volume requirement is high, but the electrochemical method cannot be used, and the dissolved air flotation treatment capacity needs to be improved. The adopted emergency treatment process scheme for oily fire-fighting wastewater is as follows: adding an appropriate amount of flocculant and demulsifier to the stirring tank, setting the diversion ratio of the T-tube separator to 0.85-0.90, the reflux ratio of the T-tube separator to 0.1-0.15, the internal pressure of the dissolved air tank to 0.35-0.4Mpa, and the gas-liquid ratio of the dissolved air tank to 0.45-0.55.

[0175] Example 9

[0176] This embodiment adopts the oily firefighting wastewater emergency treatment and reuse device described in Example 2, and based on the oily firefighting wastewater emergency treatment and reuse method proposed in Example 4, forms an oily firefighting wastewater emergency treatment process plan for the fifth working condition.

[0177] The fifth working condition is that the cooling wastewater is urgently treated and reused for fire fighting and the site has electricity conditions.

[0178] In this embodiment, for the fifth working condition, since the content of pollutants in the cooling wastewater is low, the production volume is high, and the purity requirement of cooling water is high and the demand is low, the sewage treatment degree requirement is high and the treatment volume requirement is low, the emergency treatment process scheme of oily firefighting wastewater adopted is: adding an appropriate amount of flocculant and demulsifier to the stirring tank, setting the split ratio of the T-tube separator to 0.80-0.85, the reflux ratio of the T-tube separator to 0.15-0.2, the internal pressure of the dissolved air tank to 0.25-0.35Mpa, the gas-liquid ratio of the dissolved air tank to 0.04-0.05, and the current density of the power supply to 1000-1500A / m 2 .

[0179] Example 10

[0180] This embodiment adopts the oily firefighting wastewater emergency treatment and reuse device described in Example 2, and based on the oily firefighting wastewater emergency treatment and reuse method proposed in Example 4, forms an oily firefighting wastewater emergency treatment process plan for the sixth working condition.

[0181] The sixth working condition is that the cooling wastewater is urgently treated and reused for fire fighting and there is no electricity condition on site.

[0182] In this embodiment, for the sixth working condition, since the content of pollutants in the cooling wastewater is low, the production volume is high, and the purity requirement for cooling water is high and the demand is low, the sewage treatment degree requirement is high and the treatment volume requirement is low, but the electrochemical method cannot be used, and the dissolved air flotation treatment capacity needs to be improved. The adopted emergency treatment process scheme for oily firefighting wastewater is as follows: adding an appropriate amount of flocculant and demulsifier to the stirring tank, setting the diversion ratio of the T-tube separator to 0.80-0.85, the reflux ratio of the T-tube separator to 0.15-0.2, the internal pressure of the dissolved air tank to 0.35-0.4Mpa, and the gas-liquid ratio of the dissolved air tank to 0.05-0.06.

[0183] Example 11

[0184] This embodiment adopts the oily firefighting wastewater emergency treatment and reuse device described in Example 2, and based on the oily firefighting wastewater emergency treatment and reuse method proposed in Example 4, forms an oily firefighting wastewater emergency treatment process plan for the seventh working condition.

[0185] The seventh working condition is that the cooling wastewater is urgently treated and reused for cooling and the site has electricity conditions.

[0186] In this embodiment, for the seventh working condition, since the content of pollutants in the cooling wastewater is low, the production volume is high, and the purity requirement of cooling water is low and the demand is high, the sewage treatment degree is required to be high, the emergency treatment process scheme of oily firefighting wastewater adopted is: appropriately reduce the input amount of flocculant and demulsifier in the stirring tank, set the split ratio of the T-tube separator to 0.90-0.95, set the reflux ratio of the T-tube separator to 0.05-0.1, set the internal pressure of the dissolved air tank to 0.2-0.25Mpa, set the gas-liquid ratio of the dissolved air tank to 0.03-0.04, and set the current density of the power supply to 500-1000A / m 2 .

[0187] Example 12

[0188] This embodiment adopts the oily firefighting wastewater emergency treatment and reuse device described in Example 2, and based on the oily firefighting wastewater emergency treatment and reuse method proposed in Example 4, forms an oily firefighting wastewater emergency treatment process plan for the eighth working condition.

[0189] The eighth working condition is that the cooling wastewater is urgently treated and reused for cooling and there is no electricity condition on site.

[0190] In this embodiment, for the eighth working condition, since the content of pollutants in the cooling wastewater is low, the production volume is high, and the purity requirement for cooling water is low and the demand is high, a high degree of wastewater treatment is required, but the electrochemical method cannot be used, and the dissolved air flotation treatment capacity needs to be improved. The emergency treatment process scheme for oily firefighting wastewater adopted is: appropriately reduce the input amount of flocculant and demulsifier in the stirring tank, set the split ratio of the T-tube separator to 0.90-0.95, set the reflux ratio of the T-tube separator to 0.05-0.1, set the internal pressure of the dissolved air tank to 0.2-0.25Mpa, and set the gas-liquid ratio of the dissolved air tank to 0.04-0.05.

[0191] The above-mentioned Examples 5 to 12 set the oily firefighting sewage treatment process parameters for different working conditions according to the sources of different oily firefighting sewage, the uses of the oily firefighting sewage after treatment, and the on-site electricity conditions, and form an oily firefighting sewage emergency treatment process plan for each working condition, thereby realizing the treatment of oily firefighting sewage under various working conditions and ensuring that the oily firefighting sewage meets the treatment standards.

[0192] In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0193] In the present invention, the directions or positional relationships indicated by terms such as "upper", "lower", "bottom", and "top" are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention. They do not specifically refer to any part or element in the present invention and cannot be understood as limitations on the present invention.

[0194] In the present invention, terms such as "connected" and "connection" should be interpreted broadly to mean a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediary. Relevant researchers or technicians in this field may determine the specific meanings of these terms in the present invention based on specific circumstances, and they should not be construed as limitations on the present invention.

[0195] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. An emergency treatment and reuse device for oily firefighting wastewater, characterized in that: It includes a stirring tank, a T-tube separator, an air dissolving tank and an overflow collection tank; The T-tube separator is provided with a fire sewage inlet end, a dissolved air water inlet end, a gas-liquid-solid phase outflow end and a fire reuse water outflow end. The fire sewage inlet end and the dissolved air water inlet end are arranged on the same side of the T-tube separator, and the gas-liquid-solid phase outflow end and the fire reuse water outflow end are arranged on the other side of the T-tube separator. The fire sewage inflow end of the T-tube separator is connected to the stirring tank through a first pipeline. A feed pump is provided on the side of the first pipeline close to the stirring tank, and a feed flow meter is provided on the side close to the fire sewage inflow end of the T-tube separator; The stirring tank is connected to the oily firefighting sewage injection pipeline through a liquid inlet pipeline. An agitator is provided in the stirring tank for uniformly stirring the oily firefighting sewage and the input agent. The dissolved air water inlet end of the T-tube separator is connected to the bottom of the dissolved air tank through a second pipeline, and a releaser is provided at the connection end of the second pipeline and the T-tube separator; An air injection pipeline is also provided at the bottom of the air dissolving tank, and an air compressor, a first control valve, an air flow meter and a check valve are sequentially provided on the air injection pipeline. The air compressor is provided near the air inlet end of the air injection pipeline and is used to inject compressed air into the air injection pipeline; The top of the gas dissolving tank is provided with a pressure gauge and a safety valve, the pressure gauge is used to measure the pressure inside the gas dissolving tank, the safety valve is used to unload the pressure inside the gas dissolving tank, a liquid level gauge is provided on the side wall of the gas dissolving tank, used to measure the liquid level height inside the gas dissolving tank, and a packing layer is provided inside the gas dissolving tank to increase the gas dissolving efficiency of the gas dissolving tank; The gas-liquid-solid phase outflow end of the T-tube separator is connected to an overflow collection tank, and the overflow collection tank is used to collect waste materials flowing out of the gas-liquid-solid phase outflow end of the T-tube separator; The fire-fighting recycled water outflow end of the T-tube separator is connected to the inflow end of the third pipeline, and a second control valve and a liquid phase outlet flowmeter are sequentially provided on the third pipeline. The second control valve is close to the inflow end of the third pipeline. The outflow end of the third pipeline is divided into two paths, one of which is connected to the external water pipeline through the fourth pipeline, and the other is connected to the top of the dissolved air tank through the fifth pipeline. The third control valve, a reflux pump and a reflux flowmeter are sequentially provided on the fifth pipeline, and the third control valve is close to the injection end of the fifth pipeline; The T-tube separator includes a horizontal pipe section and a vertical pipe section, wherein the horizontal pipe section includes an upper horizontal pipe, a middle horizontal pipe and a lower horizontal pipe, and the vertical pipe section includes multiple vertical pipes; one end of the upper horizontal pipe is blocked, and the other end is set as a gas-liquid-solid phase outflow end; one end of the middle horizontal pipe is set as a fire sewage inflow end, and the other end is blocked; one end of the lower horizontal pipe is set as a dissolved air water inflow end, and the other end is set as a fire recycled water outflow end; the upper horizontal pipe, the middle horizontal pipe and the lower horizontal pipe are connected in the vertical direction through multiple vertical pipes; the vertical pipe passes through the middle horizontal pipe, the top end extends into the upper horizontal pipe, and the bottom end extends into the lower horizontal pipe; electrolysis electrodes are provided in each vertical pipe between the middle horizontal pipe and the lower horizontal pipe.

2. The oily firefighting wastewater emergency treatment and reuse device according to claim 1 is characterized in that: The vertical tubes are evenly distributed on the middle horizontal tube, and the intervals between adjacent vertical tubes are the same, connecting the upper horizontal tube, the middle horizontal tube and the lower horizontal tube in the vertical direction; The length of the electrolysis electrode is equal to the vertical distance between the middle horizontal tube and the lower horizontal tube. Each electrolysis electrode is connected in parallel to the power supply. The electrolysis electrode close to the fire sewage inflow end of the T-tube separator is connected to the positive pole of the power supply, and the electrolysis electrode close to the fire recycled water outflow end of the T-tube separator is connected to the negative pole of the power supply. The number of electrolysis electrodes connected to the positive pole of the power supply is equal to the number of electrolysis electrodes connected to the negative pole of the power supply.

3. The oily fire-fighting sewage emergency treatment and reuse device according to claim 2 is characterized in that: The diameters D of the upper horizontal pipe, the middle horizontal pipe, and the lower horizontal pipe in the horizontal pipe section of the T-tube separator are all the same. The diameter of the horizontal pipe section in the T-tube separator is determined according to the injection amount and injection flow rate of the oily firefighting sewage, as shown in formula (1): （1） Where, —Injection volume of oily firefighting sewage, in m 3 / h; —pipe diameter, in m; —Injection velocity of oily firefighting sewage, in m / s; The diameter of the vertical tube in the vertical tube section, the height of the vertical tube, and the spacing between adjacent vertical tubes are set according to the diameter D of the horizontal tube section in the T-tube separator. The diameter of the vertical tube is set to half the diameter D of the horizontal tube section, the height of the vertical tube is set to ten times the diameter D of the horizontal tube section, and the spacing between adjacent vertical tubes is set to twenty times the diameter D of the horizontal tube section.

4. The oily firefighting wastewater emergency treatment and reuse device according to claim 3 is characterized in that: The number of the vertical tubes is set to an even number.

5. The oily fire-fighting wastewater emergency treatment and reuse device according to claim 4 is characterized in that: The number of vertical pipes in the T-tube separator is set according to the injection volume of oily firefighting sewage; When the injection volume of oily firefighting sewage No more than 50m 3 / h, the number of vertical tubes in the T-tube separator is set to 4, and 4 electrolysis electrodes are set, of which 2 electrolysis electrodes are connected to the positive electrode of the power supply, and 2 electrolysis electrodes are connected to the negative electrode of the power supply; When the injection volume of oily firefighting sewage More than 50m 3 / h and not more than 100m 3 / h, the number of vertical tubes in the T-tube separator is set to 6, and 6 electrolysis electrodes are set, of which 3 electrolysis electrodes are connected to the positive electrode of the power supply, and 3 electrolysis electrodes are connected to the negative electrode of the power supply; When the injection volume of oily firefighting sewage More than 100m 3 / h and not more than 200m 3 / h, the number of vertical tubes in the T-tube separator is set to 8, and 8 electrolysis electrodes are set, of which 4 electrolysis electrodes are connected to the positive electrode of the power supply, and 4 electrolysis electrodes are connected to the negative electrode of the power supply.

6. The oily firefighting wastewater emergency treatment and reuse device according to claim 1 is characterized in that: The volume of the stirring tank It is determined based on the injection volume of oily fire-fighting sewage and the premixing time of the selected demulsifier.

7. The oily firefighting wastewater emergency treatment and reuse device according to claim 6 is characterized in that: The volume of the stirring tank Set to 5m 3 .

8. The oily firefighting wastewater emergency treatment and reuse device according to claim 1 is characterized in that: The releaser is configured as a TS-type releaser, a TJ-type releaser or a TV-type releaser.

9. The oily firefighting wastewater emergency treatment and reuse device according to claim 1, characterized in that: The packing layer is filled with ball ring packing, porcelain Raschig ring packing, plastic step ring packing or corrugated packing.

10. The oily firefighting wastewater emergency treatment and reuse device according to claim 2, characterized in that: The electrolytic electrode connected to the positive electrode of the power supply is made of a transition metal material, and the electrolytic electrode connected to the negative electrode of the power supply is made of an inert electrode.

11. The oily firefighting wastewater emergency treatment and reuse device according to claim 10, characterized in that: The current density of the power supply is set to 1-2000A / m 2 .

12. The oily firefighting wastewater emergency treatment and reuse device according to claim 1, characterized in that: The oily fire-fighting sewage emergency treatment and reuse device is provided with a plurality of T-tube separators, and the T-tube separators are connected in parallel with each other through pipelines.

13. A method for emergency treatment and reuse of oily firefighting wastewater, characterized in that: The oily firefighting wastewater emergency treatment and reuse device as claimed in claim 2 specifically comprises the following steps: Step 1: Determine the treatment standard for the oily firefighting wastewater based on the source of the oily firefighting wastewater and the intended use of the treated wastewater, combined with the water quality test results of the oily firefighting wastewater; Step 2: Determine the process parameters for the treatment of the oily firefighting wastewater based on the source and purpose of the oily firefighting wastewater and the power requirements at the site of the emergency treatment and reuse of the oily firefighting wastewater, and formulate an emergency treatment process plan for the oily firefighting wastewater. Step 3: According to the emergency treatment process plan for oily fire-fighting wastewater, the oily fire-fighting wastewater is emergency treated using the oily fire-fighting wastewater emergency treatment and reuse device, and the emergency treatment process plan for oily fire-fighting wastewater is dynamically adjusted during the emergency treatment process to obtain treated oily fire-fighting wastewater.

14. The method for emergency treatment and reuse of oily firefighting wastewater according to claim 13, characterized in that: In step 1, if the oily firefighting wastewater is used as fire-fighting water after treatment, the oily firefighting wastewater emergency treatment and reuse device is used to deeply separate the oil and foam liquid in the oily firefighting wastewater, so that the oil content in the treated oily firefighting wastewater is less than 50 mg / L and the content of the foam liquid surfactant is less than 10 mg / L; if the oily firefighting wastewater is used as cooling water after treatment, the oily firefighting wastewater emergency treatment and reuse device is used to separate the oil in the oily firefighting wastewater, so that the oil content in the treated oily firefighting wastewater is less than 100 mg / L.

15. The method for emergency treatment and reuse of oily firefighting wastewater according to claim 14, characterized in that: In step 2, the process parameters for treating oily firefighting wastewater include demulsifier dosage, flocculant dosage, T-tube separator split ratio and reflux ratio, internal pressure and gas-liquid ratio of the air dissolving tank, and current density of the power supply.

16. The method for emergency treatment and reuse of oily firefighting wastewater according to claim 15, characterized in that: The demulsifier dosage is set to 20-50 mg / L, the flocculant dosage is set to 100-250 mg / L, the split ratio of the T-tube separator is set to 0.80-0.95, the reflux ratio of the T-tube separator is set to 0.05-0.2, the internal pressure of the gas dissolving tank is set to 0.2-0.4 MPa, the gas-liquid ratio of the gas dissolving tank is set to 0.03-0.06, and the current density of the power supply is set to 1-2000 A / m 2 .

17. The method for emergency treatment and reuse of oily firefighting wastewater according to claim 13, characterized in that: The specific treatment process of treating oily firefighting sewage using the oily firefighting sewage emergency treatment and reuse device is as follows: The oily firefighting sewage is injected into the mixing tank, and the demulsifier and flocculant are added to stir evenly. After that, the sewage is injected into the T-tube separator through the inlet end of the T-tube separator. At this time, the oily firefighting sewage exists in three phases: solid phase, gas phase and liquid phase. The solid phase is suspended solid particles and flocs produced by flocculation. The gas phase is gas produced by dissolved air flotation and electric flotation. The liquid phase is oil and foam liquid. Turn on the air compressor, the first control valve, and the check valve. According to the process parameters for the treatment of oily fire-fighting wastewater and the readings of the air flow meter and the pressure gauge, adjust the flow rate of compressed air injected into the dissolved air tank, control the internal pressure and gas-liquid ratio of the dissolved air tank, and use the releaser to inject the dissolved air water generated in the dissolved air tank into the T-tube separator through the dissolved air water inlet port. Due to the density difference between the solid, gaseous and liquid phases in the oily firefighting wastewater, the gaseous phase in the oily firefighting wastewater first moves into the upper horizontal tube of the T-tube separator and is discharged through the gas-liquid-solid phase outflow end. Subsequently, the emulsified oil in the oil-liquid phase of the oily firefighting wastewater aggregates under the action of the demulsifier and air flotation, and is attached by microbubbles. Under the action of buoyancy, it rises and converges to form suspended oil. Under the action of oil-water slip and inertial force, the suspended oil is discharged through the gas-liquid-solid phase outflow end of the T-tube separator to the overflow collection tank. The current density of the power supply is set according to the process parameters for treating the oily firefighting wastewater. The power supply is turned on so that each electrolysis electrode connected to the power supply is energized. The electrolysis electrode connected to the positive electrode of the power supply electrolyzes to produce transition metal ions for flocculation, thereby treating suspended solid particles and flocs in the solid phase of the oily firefighting wastewater. The electrolysis electrode connected to the negative electrode of the power supply is an inert electrode. Microbubbles are generated during the electrolysis process for deep treatment after dissolved air flotation. The diameter of the microbubbles is less than 50 μm. At the same time, the electrolysis electrodes oxidize and degrade the foam liquid around the electrolysis electrodes based on electrocatalytic oxidation. The oxidized and degraded foam liquid floats to the upper horizontal tube of the T-tube separator and is discharged to the overflow collection tank through the gas-liquid-solid phase outflow end. The suspended solid particles and flocs in the solid phase of the oily firefighting wastewater are captured by the microbubbles. The suspended solid particles and flocs adhere to the surface of the microbubbles and float up with the microbubbles to the upper horizontal tube of the T-tube separator. They are then discharged to the overflow collection tank through the gas-liquid-solid phase outflow end of the T-tube separator. Finally, the second control valve is opened to allow the treated oily firefighting sewage to flow out of the T-tube separator through the firefighting recycled water outflow end, thereby obtaining the treated oily firefighting sewage.

18. The method for emergency treatment and reuse of oily firefighting wastewater according to claim 13, characterized in that: During the emergency treatment and reuse process of the oily firefighting sewage, the third control valve is opened to re-inject the treated oily firefighting sewage into the dissolved air tank, and the treated oily firefighting sewage is used to generate dissolved air water.

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