CN215403399U - Oil refining sewage split-phase treatment integrated system - Google Patents
Oil refining sewage split-phase treatment integrated system Download PDFInfo
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- CN215403399U CN215403399U CN202120296248.2U CN202120296248U CN215403399U CN 215403399 U CN215403399 U CN 215403399U CN 202120296248 U CN202120296248 U CN 202120296248U CN 215403399 U CN215403399 U CN 215403399U
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Abstract
The application provides an oil refining sewage split-phase processing integration system includes: the device comprises a membrane filtering device, a power ultrasonic treatment device, a solid-liquid separation device, a liquid-liquid separation device and a sewage purification treatment device; the membrane filtering device is provided with an inlet for inputting sewage, a first outlet for outputting filtrate and a second outlet for outputting concentrated solution; the sewage purification treatment device is connected with a first outlet of the membrane filtration device; the concentrated solution processing unit is connected with the second outlet of the membrane filtering device; the concentrated solution treatment unit comprises a power ultrasonic treatment device, a solid-liquid separation device and a liquid-liquid separation device, wherein the power ultrasonic treatment device, the solid-liquid separation device and the liquid-liquid separation device are sequentially connected along the input direction of concentrated solution, the solid-liquid separation device is provided with a liquid phase discharge port and a solid phase discharge port, and the liquid phase discharge port is connected with the liquid-liquid separation device; the liquid-liquid separation device is provided with a water phase outlet and an oil phase outlet, wherein the water phase outlet is connected with the sewage purification treatment device.
Description
Technical Field
The utility model belongs to the field of sewage treatment, and particularly relates to an oil refining sewage split-phase treatment integrated system.
Background
In the modern times, the world economy is continuously developed, the living standard of people is continuously improved, and the demand on petroleum is continuously increased. The reserves of conventional petroleum are continuously reduced, and unconventional petroleum resources such as heavy oil and the like with great potential and broad prospect become one of important energy sources in the 21 st century. Thickened oils generally refer to viscosities greater than lxl02MPa.s or relative density greater than 934g/cm3Of heavy asphaltene crude oil, and having a viscosity of greater than 5xl04The heavy oil of MPa.s is regarded as heavy oil. 70 percent of the residual petroleum resources in the world are thick oil which is bound to become a main successor resource in the future in China. Most experts think that in view of the situation of supply and demand of petroleum, the development and utilization of thick oil are directly related to the future energy safety of China, and the strategic significance is obvious.
Venezuela, Canada, USA, Russia, China, Indonesia and the like are large countries with abundant thickened oil resources. China's heavy oil is produced mainly from the river-returning oil field, the victory oil field, the ocean oil field, the central oil field and the Clarity oil field. At present, the processing modes of the thickened oil mainly comprise normal reduced pressure distillation, direct delayed coking and the like, so that the thickened oil sewage of a refinery mainly comprises thickened oil storage tank dehydration, calcium removal electric desalting sewage, coking large steam blowing condensed water, various process drainage in the thickened oil processing process and the like. Compared with the common sewage, the oil refining sewage has complex components, contains natural substances such as suspended emulsified oil drops, solid particles, soluble salts and the like, and also contains various medicaments such as chemical additives, lubricants and the like, so that the produced water is seriously emulsified, has a stable structure and is difficult to treat. And the thickened oil refining sewage has the characteristics of high organic matter content, easy emulsification, density close to water, poor biodegradability, stable oil-water interface and the like, and a conventional sewage treatment system in the industry generally requires that the treated sewage meets the requirements that COD is less than 1000mg/L, oil content and suspended matters are less than 200mg/L, so that the treated sewage can enter a sewage treatment plant, otherwise, a large amount of bacteria in a biochemical pool die, but the thickened oil refining sewage cannot meet the requirements, cannot be directly merged into the sewage treatment system for treatment, and must be pretreated to reach the standard. High-concentration oily sewage in a refinery is a bottleneck for a long time for restricting the discharge of the sewage reaching the standard, and the increase of the processing amount of thick oil further increases the difficulty of sewage treatment, so that the source control of pollution must be implemented.
Environmental protection work of refining enterprises, particularly pollutant emission reduction and sewage discharge reaching standards are a complex system project, aiming at severe environmental protection situation, the sustainable development of heavy oil enterprises can be guaranteed only by grasping each link of clean production, pollution treatment, environmental management and comprehensive utilization. Only by adopting advanced and reasonable treatment process to carry out source control and process control on the sewage and simultaneously realizing resource utilization and reduction, the environmental protection work of the viscous oil processing enterprises can be further perfected.
Because the emulsified sewage from heavy oil processing has serious oil, the oil exists in the sewage in a dispersed state and contains solid impurities such as oil sludge, sand and the like, the traditional gravity separation methods such as a storage tank, an oil separation tank and the like have poor treatment effect on the sewage; direct centrifugal separation and the like can cause secondary emulsification of oil in sewage due to high-speed rotation, and are not suitable for separation of emulsified oil; flocculation, air flotation and other technologies are not suitable for sewage treatment with large oil fluctuation.
At present, the technology of applying ultrasonic waves to biological sewage treatment in China mostly adopts a method of applying high-intensity ultrasonic waves to sludge reduction. The reinforced sewage treatment effect is divided into two types, one is that the industrial wastewater is pretreated by ultrasonic waves, and macromolecular organic matters which are difficult to degrade are decomposed and then enter a biological treatment device. The other type is used for urban sewage, and adopts a conventional activated sludge process or SBR process and an external ultrasonic radiation device. The method comprises the following steps: taking the sludge out of the reaction device by a pump and the like for ultrasonic treatment, and returning the sludge after the radiation treatment to a sewage biological treatment facility; or the reaction tank provided with the ultrasonic generator is connected to an activated sludge return line of the secondary sedimentation tank, and a sludge structure generated by high-intensity ultrasonic waves is damaged to release a soluble carbon source, nitrogen and the like, or local hot points generate dissolving and inactivating effects, so that the purpose of sludge crushing and reduction and the sludge activity enhancement are achieved, and the ultrasonic energy consumption is higher.
For example, CN101376553A provides a method for treating low-temperature sewage by using a low-intensity ultrasonic wave-enhanced membrane bioreactor, which is characterized in that: the low-temperature sewage flowing out through the superfine grating flows into an anaerobic tank 1 and an aerobic tank 2 of the membrane bioreactor; then, the treated low-temperature sewage flows into a membrane pool 3 of a membrane bioreactor, a membrane component 4 with a membrane aperture of 0.1-0.2 micron is hung in the membrane pool 3, the loading density of the membrane is 1.5-2.0 m2 membrane area/m 3 treated water volume, low-intensity ultrasonic waves are utilized to irradiate the low-temperature sewage in the membrane pool 3 for 15-20 min, and the action parameters of the low-intensity ultrasonic waves are 20-28kHz and the power density is 0.13-0.27W/L; the sludge concentration in the membrane pool is 8000-15000mg/L, and the bottom of the membrane pool 3 is provided with an aeration device 6 for carrying out oxygenation and aeration on the low-temperature sewage in the membrane pool 3.
CN102730912A discloses an integrated sewage sludge treatment method, ozone is introduced to ensure that the removal rate of organic matters is 15-20 percent, and primary purified mixed liquor is obtained; treating the primary purified mixed solution by using ultrasonic waves to obtain secondary purified mixed solution; the primary purification mixed liquid is treated by ultrasonic waves, tough cell walls are broken by using shock waves generated by the cavitation effect of the ultrasonic waves in the liquid and the local instantaneous high-temperature physical action, intracellular substances are released into a liquid phase to be biochemically degraded and removed, and the cell walls of microorganism residual nuclei occupying the main components in the sludge are broken and broken to lay the foundation for subsequent anaerobic and aerobic biochemical treatment, so that secondary purification mixed liquid is obtained.
CN102139990A discloses a waste penetrant ultrasonic wave combination waste water treatment process, which is characterized by sequentially comprising the following steps: a, removing large suspended matters from garbage penetrating fluid through a grid channel, then feeding the garbage penetrating fluid into a covered regulating tank, intercepting and precipitating most suspended matters, hair and large gravel, regulating water quality and water quantity, and carrying out anaerobic and hydrolysis reactions; b, adjusting the pH value of the solution treated in the step a in a coagulating sedimentation tank, and adding a composite coagulant LC1 and a composite flocculant LC2Precipitating inorganic solutes, heavy metals and organic colloids; c, adsorbing refractory organic matters and anions and cations in the solution treated in the step b in an ultrasonic catalytic oxidation tank to generate OH, OOH and H2O2Carrying out internal electrolysis on the free radicals, carrying out redox reaction to remove ammonia nitrogen and sulfide, filtering and degrading humic acid, sulfide, halide, long carbon chain hydrocarbon, heterocyclic hydrocarbon, benzene ring and suspension colloid so as to remove part of COD, remove the toxicity of the solution and improve the biochemical ratio of refractory organic matters to BOD/COD ═ 0.3; d, sequentially performing serial biological treatment on the solution treated in the step c in an ABR baffle plate anaerobic pool, a hydrolysis pool, a facultative tank and an aerobic pool, and performing nanofiltration and reverse osmosis membrane filtration treatment on the finally treated solution in an RO membrane reverse osmosis system to obtain the water which meets the water reuse quality of the national miscellaneous water for daily use.
The oil in the industrial oily wastewater can be divided into four types of floating oil, dispersed oil, emulsified oil and dissolved oil, wherein the floating oil can realize oil-water separation by means of gravity separation treatment methods such as oil separation, air flotation and the like; the dispersed oil droplets are small and are suspended in water, and oil can be removed by a common oil-water separation method after a proper oil-water separating agent is added; the emulsified oil usually contains a surfactant, the molecules of the surfactant are of an amphiphilic structure and form stable emulsified particles in water, and the oily wastewater is high in treatment difficulty; the oil substances in the dissolved oil are molecularly distributed in water, and thus the oil particles are finer than the emulsified oil. The more stable the system, the more difficult it is to remove by conventional methods. The oil in the drainage water of various processes in the thick oil processing process is usually emulsified oil.
The above-mentioned prior art sewage treatment process is not suitable for the treatment of refinery process sewage, especially heavy oil refinery sewage.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an oil refining sewage, in particular to a phase-splitting treatment integrated system for thick oil refining sewage, which can completely treat sewage containing oil and solid particles and finally realize three-phase separation of sludge-containing sewage. The wastewater without oil and solid particles enters a sewage purification treatment system for conventional sewage treatment.
The application provides an oil refining sewage split-phase processing integration system includes:
the membrane filtering device is provided with an inlet for inputting sewage, a first outlet for outputting filtrate and a second outlet for outputting concentrated solution;
the sewage purification treatment device is connected with the first outlet of the membrane filtration device;
the concentrated solution processing unit is connected with the second outlet of the membrane filtering device;
the concentrated solution treatment unit comprises a power ultrasonic treatment device, a solid-liquid separation device and a liquid-liquid separation device which are sequentially connected along the input direction of concentrated solution, wherein the solid-liquid separation device is provided with a liquid phase discharge port and a solid phase discharge port, and the liquid phase discharge port is connected with the liquid-liquid separation device; the liquid-liquid separation device is provided with a water phase outlet and an oil phase outlet, wherein the water phase outlet is connected with the sewage purification treatment device.
In one embodiment, a pump body is arranged between the membrane filtration device and the sewage purification treatment device, a pump body is arranged between the membrane filtration device and the power ultrasonic treatment device, a pump body is arranged between the power ultrasonic treatment device and the solid-liquid separation device, and a pump body is arranged between the liquid-liquid separation device and the sewage purification treatment device.
In one embodiment, the filtering membrane used in the membrane filtering device is an inorganic membrane or an organic membrane.
In one embodiment, the filtering membrane used in the membrane filtering device 3 is a microporous filtering membrane or an ultrafiltration membrane.
In one embodiment, the pore diameter of the microfiltration membrane or ultrafiltration membrane is 10-100 nm.
In one embodiment, the pore size of the microfiltration membrane or ultrafiltration membrane is 30-70 nm.
In one embodiment, the power ultrasonic treatment device is a batch tank type ultrasonic treatment device or a continuous pipe type ultrasonic treatment device.
In one embodiment, the solid-liquid separation device is a decanter centrifuge.
In one embodiment, the liquid-liquid separation device is a vertical centrifuge.
Has the advantages that:
by using the oil refining sewage split-phase treatment integrated system provided by the utility model, the pretreated oil refining sewage can completely meet the requirements that the COD is less than 1000mg/L, the oil content and suspended matters are required to be less than 200mg/L, and the water can be directly discharged after entering a chemical sewage purification system for treatment.
The oil refining sewage split-phase treatment integrated system provided by the utility model can be used for completely treating oil-containing and solid particle-containing thick oil processing sewage, and finally realizing three-phase separation of mud-containing sewage. The wastewater without oil and solid particles meets the sewage index requirement of a chemical sewage purification system, and enters a sewage purification treatment system for conventional sewage treatment.
Drawings
FIG. 1 shows an integrated system for the split-phase treatment of refinery sewage.
Wherein the reference numerals are:
the device comprises a membrane filtering device 3, a power ultrasonic treatment device 12, a solid-liquid separation device 16, a liquid-liquid separation device 21, a sewage purification treatment device 8, a first outlet 5, a second outlet 4, an outlet 13, a solid phase discharge port 18, a liquid phase discharge port 17, an oil phase discharge port 23, a water phase discharge port 22, a purified water discharge port 9 and inlets 2, 7, 11 and 25.
Detailed Description
The detailed description and technical contents of the utility model are described as follows with the accompanying drawings: the utility model is further described with reference to the following figures and examples: the following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The oil refining sewage split-phase treatment integrated system comprises a membrane filtering device 3, a power ultrasonic treatment device 12, a solid-liquid separation device 16, a liquid-liquid separation device 21 and a sewage purification treatment device 8; wherein the membrane filtration device is provided with an inlet 2 for inputting sewage, a first outlet 5 for outputting filtrate and a second outlet 4 for outputting concentrated solution, the first outlet 5 of the membrane filtration device is connected to an inlet 7 of the sewage treatment device through a pipeline, the second outlet 4 of the membrane filtration device is connected to an inlet 11 of the power ultrasonic treatment device through a pipeline, an outlet 13 of the ultrasonic treatment device 12 is connected to an inlet 15 of the solid-liquid separation device through a pipeline, the solid-liquid separation device 16 is provided with a solid phase discharge port 18 and a liquid phase discharge port 17, the liquid phase discharge port 17 is connected to a liquid-liquid separation device 21 through a pipeline, the liquid-liquid separation device is provided with an oil phase discharge port 23 for discharging dirty oil and a water phase discharge port 22 for discharging sewage, the water phase discharge port 22 is connected to an inlet 25 of the sewage purification treatment device 8 through a pipeline, and the sewage purification treatment device 8 is provided with a purified water discharge port 9.
The concentrated solution is subjected to ultrasonic treatment, the treated liquid is delivered to the solid-liquid separation device 16, solid-phase oil sludge is separated, the liquid requiring further separation is delivered to the liquid-liquid separation device 21, recoverable dirty oil is separated, and finally, the dirty water is delivered to the sewage treatment device 8.
The pump body is arranged between the membrane filtration device and the sewage purification treatment device, the pump body is arranged between the membrane filtration device and the power ultrasonic treatment device, the pump body is arranged between the power ultrasonic treatment device and the solid-liquid separation device, the pump body is arranged between the liquid-liquid separation device and the sewage purification treatment device, and the pump body is a feeding pump, a priming pump and the like.
The oil refining sewage enters the membrane filtration device through a sewage feeding pipeline, the sewage feeding pipeline is provided with a feeding pump, the membrane filtration device is provided with an inlet for inputting the sewage, a first outlet for outputting a filtrate and a second outlet for outputting a concentrated solution, the first outlet for outputting the filtrate of the membrane filtration device is connected with the inlet of the sewage treatment device 8, the second outlet for outputting the concentrated solution of the membrane filtration device is connected with the inlet of the power ultrasonic treatment device 12, the power ultrasonic treatment device 12 is used for carrying out ultrasonic treatment on the concentrated solution and outputting the treated liquid to the solid-liquid separation device 16, the solid-liquid separation device 16 is used for separating solid-phase oil sludge and outputting the liquid needing further separation to the liquid-liquid separation device 21, and the liquid-liquid separation device 21 is used for separating the liquid into recyclable dirty oil and recoverable waste oil, And the sewage that needs further treatment is output to the sewage treatment device 8.
The oil refining sewage is one or a mixture of a plurality of oily sewage in the backwashing water of an electric desalting device, the electric desalting drainage, the dehydration of a heavy oil storage tank, the delayed coking large steam blowing condensation sewage and the process drainage of an atmospheric and vacuum distillation device.
The filtration membrane used in the membrane filtration device 3 is an inorganic membrane or an organic membrane, and more preferably an inorganic membrane. Of course, the filtration membrane used in the membrane filtration device 3 may be a microfiltration membrane or an ultrafiltration membrane, preferably a membrane having a pore size of 10 to 100nm, and more preferably a membrane having a pore size of 30 to 70 nm. The number of the filtering membrane tubes in the membrane filtering device 3 can be one or more, and the arrangement mode of the plurality of the membrane tubes can be parallel connection or series connection.
The inorganic film or the organic film of the present invention. The membrane of the membrane element made of an inorganic material is referred to as an inorganic membrane, and the membrane of the membrane element made of a high molecular polymer is referred to as an organic membrane. The filtering membranes are classified according to the size of the intercepted raw water particles, and the membrane pores are divided into a micro-filtering membrane MF, an ultra-filtering membrane UF, a nanofiltration membrane NF and a reverse osmosis membrane RO from coarse to fine. The sewage treatment is generally carried out by adopting a microfiltration and ultrafiltration membrane, wherein the microfiltration and ultrafiltration membrane is micro-porousFiltration is the most widely used and most economical membrane separation technique. The ceramic membrane is a novel microfiltration membrane. Ceramic film consisting essentially of Al2O3、ZrO2And the like, and is resistant to high temperature, high pressure and corrosion.
The filtration membrane used in the membrane filtration device 3 of the present invention may be an organic membrane such as cellulose derivatives, polysulfones, polyamides, polyimides, polyester-based polyolefins, silicon-containing polymers, fluorine-containing polymers, or an inorganic membrane such as a metal membrane, an alloy membrane, a ceramic membrane, a polymer-technology-compatible membrane, a molecular sieve composite membrane, a zeolite membrane, or a glass membrane. More preferably an inorganic membrane.
The oil refining processing sewage firstly enters the membrane filtration treatment device, the membrane can intercept oil particles in the emulsion, low molecules such as sodium hydroxide, salt and partial surfactant permeate the membrane to reduce the emulsification of the oil in the sewage, and partial sewage is filtered out through the membrane filtration treatment device, so that the sewage entering the power ultrasonic treatment device is concentrated, the ultrasonic efficiency is improved, and the investment cost of the ultrasonic device is reduced.
The power ultrasonic treatment device 12 is an intermittent kettle type ultrasonic treatment device or a continuous tube type ultrasonic treatment device. The solid-liquid separation device 16 is a decanter centrifuge. The liquid-liquid separation device 21 is a vertical centrifuge. The sewage purification treatment device 8 comprises a structural facility with oil separation, air flotation and/or biochemical functions, and can enable the treated water to reach the direct discharge standard.
The power ultrasonic treatment device 12 of the utility model mainly changes the physical properties of the substance by ultrasonic energy through the generation of high-power and high-intensity ultrasonic, the propagation rule of the strong ultrasonic in a medium and the interaction of the strong ultrasonic and the substance, for example, the molecular chain of the original macromolecular chelate is broken, and micromolecules are rearranged to form a new chelate. Power ultrasound generally refers to power densities above 1W/cm2Ultrasonic waves with a frequency of less than 100 kHz.
The utility model uses the power ultrasonic treatment device 12 to carry out mechanical vibration, cavitation and thermal action of ultrasonic waves. The mechanical vibration action promotes the agglomeration of the water "particles". When the ultrasonic waves pass through the crude oil medium with the suspended water "particles", the suspended water "particles" are caused to vibrate together with the oil medium. Because the water particles with different sizes have different relative vibration speeds, the water particles collide and adhere with each other, so that the volume and the mass of the particles are increased, and finally the particles are settled and separated.
The thermal action reduces the strength of the oil-water interfacial film and the viscosity of the crude oil. On the one hand, boundary friction raises the temperature at the oil-water boundary, favoring interfacial film cracking; on the other hand, the crude oil absorbs heat energy converted by part of sound energy, so that the viscosity of the crude oil can be reduced, and the gravity settling separation of oil and water of water particles is facilitated.
The change of reaction conditions caused by cavitation results in the thermodynamic change of chemical reaction, so that the speed and yield of the chemical reaction are improved, when the ultrasonic wave acts in the liquid, the liquid flows to generate a large amount of bubbles, and the bubbles are exploded after reaching a certain air pressure degree,
when the cavitation bubbles collapse, the pressure formed on the edge walls of the cavitation bubbles can reach 1200 MPa, the instantaneous temperature reaches 5000K, and water can be decomposed into H and oH free radicals under the high-temperature and high-pressure environment generated when the cavitation bubbles collapse, so that the property of the substance is changed, and the separation process of the substance can be accelerated.
After the process, the sewage which can not be layered originally is clearly divided into three layers of oil, water and mud. However, the conventional direct centrifugal separation is not suitable for separating emulsified oil because the oil in the sewage is secondarily emulsified due to the reverse high-speed rotation.
The following examples are set forth below:
example 1
Venezuela extra heavy oil density is 1.012g/cm3Viscosity of 80 ℃ 3534mm2The sewage is processed by electro-desalting at a concentration of 16000mg/L COD, 6200mg/L oil content and 9600mg/L suspended matters, and enters a membrane filtration treatment device 3 through a pump, and is filtered by adopting an inorganic ceramic membrane with a membrane aperture of 45nm to obtain clear and transparent filtrate and concentrated solution; the filtrate directly enters a sewage purification treatment device 8; the concentrated solution enters a power ultrasonic treatment device 12The ultrasonic treatment device 12 may be a batch tank ultrasonic treatment device. Under the action of ultrasonic cavitation effect and water emulsification effect, the concentrated solution enables materials in a solution system to be uniformly dispersed, macromolecular molecular chains to be broken, small molecules to be rearranged and form a new chelate, so that components with different densities and different particle sizes are separated from each other, the solution which cannot be separated originally is effectively layered, and an obvious oil-water boundary layer is formed; the sewage obtained by the power ultrasonic treatment device 12 enters a solid-liquid separation device 16; the solid-liquid separation device 16 adopts a horizontal centrifuge and rapidly separates solid from liquid by centrifugation. A solid phase component S is obtained, and a liquid phase component enters the liquid-liquid separation device 21 for further separation. The liquid phase component is further centrifuged in the liquid-liquid separation device 21, and a butterfly centrifuge is adopted to complete liquid-liquid phase separation, so that oil-water separation in the liquid phase is realized, and a liquid-phase oily component L and a liquid-phase water component W are obtained; the treated liquid phase enters a sewage purification treatment device 8, and after oil removal, air flotation and biochemical treatment, the liquid phase meets the discharge requirement and is directly discharged; the liquid-phase oily component can be recycled; the solid phase component is dried and formed, and is convenient to transport, burn and bury.
Example 2
Canadian oil sand asphalt has density of 1.019g/cm3Viscosity of 3928mm at 80 DEG C2Dehydrating the sewage/s, wherein the COD content is 8435mg/L, the oil content is 2320mg/L, the suspended matter is 2879mg/L, the sewage enters a membrane filtering device 3 through a pump, an organic membrane is adopted for filtering, the membrane aperture is 65nm, the suspended matter, the oil content and the COD value in the sewage are reduced, and clear and transparent filtrate and concentrated solution are obtained; the filter liquor after evolution directly enters a sewage purification treatment device 8; the concentrated solution enters a power ultrasonic treatment device 12, the power ultrasonic treatment device 12 is a continuous ultrasonic treatment device, sewage passes through the pipe, an ultrasonic generation device is distributed at the equal-distance position of the whole pipeline, the flow speed is 120L/h, and the operation conditions are as follows: the temperature is 100 ℃, the working frequency is 35kHz, and the ultrasonic power is 40 KW. Under the action of ultrasonic cavitation effect and water emulsification effect, the concentrated solution can uniformly disperse the materials in the solution system, break the macromolecular chain, rearrange the micromolecules to form a new chelate, realize the mutual separation of components with different densities and different particle diameters, and ensure that the concentrated solution has no original componentsThe solution separated by the method is effectively layered to form an obvious oil-water boundary layer; the sewage obtained by the power ultrasonic treatment device 12 enters a solid-liquid separation device 16; the solid-liquid separation device 16 adopts a horizontal centrifuge, the power is 40KW, the rotating speed is 2800 r/min, and the solid-liquid separation is rapidly carried out through the centrifugal action. A solid phase component S is obtained, and a liquid phase component enters the liquid-liquid separation device 21 for further separation. The liquid phase component is further centrifuged in the liquid-liquid separation device 21, a butterfly centrifuge 25KW is adopted, the rotating speed is 2000 r/min, liquid-liquid phase separation is completed, oil-water separation in the liquid phase is realized, and liquid phase oily component L and liquid phase water component W are obtained; the COD content of the treated liquid phase water component W is 623mg/L, the oil content is 98mg/L, and the suspended matter is 113mg/L, enters a sewage purification treatment device 8, and reaches the discharge requirement after oil separation, air flotation and biochemical treatment, and is directly discharged; the liquid-phase oily component can be recycled; the solid phase component is dried and formed, and is convenient to transport, burn and bury.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications may be made without departing from the utility model, and such modifications are intended to be included within the scope of the utility model.
Claims (9)
1. An oil refining sewage split-phase treatment integrated system is characterized by comprising:
the membrane filtering device is provided with an inlet for inputting sewage, a first outlet for outputting filtrate and a second outlet for outputting concentrated solution;
the sewage purification treatment device is connected with the first outlet of the membrane filtration device;
the concentrated solution processing unit is connected with the second outlet of the membrane filtering device;
the concentrated solution treatment unit comprises a power ultrasonic treatment device, a solid-liquid separation device and a liquid-liquid separation device which are sequentially connected along the input direction of concentrated solution, wherein the solid-liquid separation device is provided with a liquid phase discharge port and a solid phase discharge port, and the liquid phase discharge port is connected with the liquid-liquid separation device; the liquid-liquid separation device is provided with a water phase outlet and an oil phase outlet, wherein the water phase outlet is connected with the sewage purification treatment device.
2. The system of claim 1, wherein a pump is arranged between the membrane filtration device and the sewage purification treatment device, a pump is arranged between the membrane filtration device and the power ultrasonic treatment device, a pump is arranged between the power ultrasonic treatment device and the solid-liquid separation device, and a pump is arranged between the liquid-liquid separation device and the sewage purification treatment device.
3. The integrated system for the phase-separated treatment of the refinery sewage of claim 1, wherein the filtering membrane used in the membrane filtering device is an inorganic membrane or an organic membrane.
4. The integrated system for the phase-separated treatment of the refinery sewage as claimed in claim 1, wherein the filtering membrane used in the membrane filtering device is a microporous filtering membrane or an ultrafiltration membrane.
5. The integrated system for phase separation treatment of refinery sewage of claim 4, wherein the pore size of the microfiltration membrane or the ultrafiltration membrane is 10-100 nm.
6. The integrated system for the phase separation treatment of the refinery sewage as recited in claim 5, wherein the aperture of said microfiltration membrane or said ultrafiltration membrane is 30-70 nm.
7. The oil refining sewage split-phase treatment integrated system of claim 1, wherein the power ultrasonic treatment device is a batch tank type ultrasonic treatment device or a continuous pipe type ultrasonic treatment device.
8. The integrated system for the split-phase treatment of the refinery sewage of claim 1, wherein the solid-liquid separation device is a decanter centrifuge.
9. The integrated system for the split-phase treatment of the refinery sewage of claim 1, wherein the liquid-liquid separation device is a vertical centrifuge.
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| CN114620870A (en) * | 2022-04-07 | 2022-06-14 | 中石化石油工程技术服务有限公司 | Oil field operation waste liquid treatment system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114620870A (en) * | 2022-04-07 | 2022-06-14 | 中石化石油工程技术服务有限公司 | Oil field operation waste liquid treatment system and method |
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