CN114702095B - Circulating oil-water separation system and method for coupling segmented fiber particles with microbubbles - Google Patents
Circulating oil-water separation system and method for coupling segmented fiber particles with microbubbles Download PDFInfo
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- CN114702095B CN114702095B CN202210230428.XA CN202210230428A CN114702095B CN 114702095 B CN114702095 B CN 114702095B CN 202210230428 A CN202210230428 A CN 202210230428A CN 114702095 B CN114702095 B CN 114702095B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2303/16—Regeneration of sorbents, filters
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention provides a circulating oil-water separation system and a circulating oil-water separation method for coupling micro bubbles by sectional fiber particles, wherein the circulating oil-water separation system comprises an air floatation device and a fiber particle filter, the air floatation device comprises an air floatation mixing tank, a dissolved air water releaser and a dissolved air pump, one end of the air floatation mixing tank is provided with an oil-containing cleaning liquid inlet and a centrifugal pump interface, the upper part of the other end of the air floatation mixing tank is provided with an oil phase outlet, the top of the air floatation mixing tank is provided with an oil discharge inlet, the bottom of the air floatation mixing tank is provided with a circulating outlet and a circulating inlet which are connected with the dissolved air pump, and the circulating inlet is connected to the dissolved air water releaser; the fiber particle filter comprises a vertical tank body, a section of longitudinal fiber filter bed and a section of transverse fiber filter bed which are arranged in the vertical tank body, wherein the top end and the bottom end of the vertical tank body are respectively provided with a solution inlet and a solution outlet, the upper part of the side wall is provided with an oil discharge outlet, the oil discharge outlet is communicated with the oil discharge inlet, and the solution inlet and the solution outlet are communicated with a centrifugal pump interface. The invention combines air floatation degreasing and fiber particle coalescence degreasing, and realizes the efficient separation of oil and water in the oil-containing cleaning liquid.
Description
Technical Field
The invention belongs to the technical field of oil-water separation equipment, and particularly relates to a circulating oil-water separation system and method of sectional type fiber particle coupling microbubbles.
Background
The global economy is rapidly growing and the petroleum consumption is also increasing. Because of wide application of petroleum and large demand, the accident leakage and unreasonable discharge of oily sewage generated in the processes of petroleum exploitation, transportation, storage, production and processing, etc. cause serious pollution to soil and underground water. Petroleum hydrocarbon contaminants in oily wastewater are persistent organic contaminants that are low reactive and degradation resistant, and pose a serious threat to human health and ecological environmental health. The oily wastewater and the decomposition products thereof contain various aromatic hydrocarbon, heavy metal and other toxic substances, not only can be horizontally diffused along with time in the environment, but also can be downwards moved under the action of gravity, so that the soil structure is damaged, the physical and chemical properties of the soil are changed, and huge toxicity is generated to plants and microorganisms.
Generally, depending on the form of the oil in water, the oils in produced water can be classified into free oil, dispersed oil, emulsified oil, and dissolved oil. The free oil is insoluble in water, has a particle size of more than 150 mu m, and floats to the surface layer of the water surface to easily form floating oil. The particle size of the dispersed oil is 20-150 mu m, and the electrostatic repulsive force exists between oil drops, so that the dispersed oil is stable in water. Emulsified oil having a particle size of 5 to 20 μm is similar to dispersed oil, but has a lower oil-water interfacial tension because its surface is covered with a surface active substance, and is more stable in water. The particle size of the dissolved oil is less than 5 mu m, and the dissolved oil is dispersed in water in the form of a solution, is a very stable homogeneous system and is difficult to separate. When the water content is within 30%, the oil phase exists mainly in a continuous phase form to form a water-in-oil emulsion; when the water content is in the range of 30% -70%, two kinds of emulsion of water-in-oil and oil-in-water may exist in the mixed solution at the same time; after the water content exceeds 70%, the aqueous phase becomes a continuous phase and an oil-in-water emulsion is formed; and as the water content increases, free water will appear in the mixture that is not emulsified. Emulsion breaking between oil and water is necessary in the oil-water separation process, whether it is a water-in-oil or oil-in-water emulsion. Different treatments or various combinations of techniques should be chosen to effect the separation for the different forms of oil present in the water.
The separation method of the oil-water mixed liquor generally comprises a physical method, a chemical method and a biological method. The physical method is a separation method implemented by utilizing the differences of physical properties such as density, conductivity, sound velocity and the like of each phase, and mainly comprises methods such as gravity sedimentation, centrifugal rotational flow, high-voltage static electricity, high-frequency pulse, microwave radiation, ultrasonic waves, air flotation and the like. However, the above single physical separation method has the disadvantages of low separation efficiency, serious equipment energy consumption and the like. The chemical method is to add a proper amount of chemical agent (demulsifier, etc.) into the oil-water mixed solution to destroy the interface stability of the oil-water emulsion, and change the emulsion state between the oil and the water into a free state, thereby realizing the interphase separation of the oil-water mixed solution. However, the waste water generated by adding the chemical agent is easy to cause secondary pollution to the environment. The biochemical method is to destroy the stable state of the oil-water emulsion by using a biological demulsifier composed of microbial cells to realize the dehydration of the oil-water mixture, and the biological method has low separation efficiency and long period.
Disclosure of Invention
In view of the problems, the invention provides a circulating oil-water separation system and method for coupling segmented fiber particles with microbubbles, which adopt the principles of air floatation degreasing and fiber particle coalescence to realize green and efficient separation of free oil, surface oil and emulsified oil in oil-containing cleaning liquid and recycle oil phase.
The invention adopts the following technical scheme: the utility model provides a circulating oil water separation system of sectional type fiber particle coupling microbubble, includes air supporting device and fiber particle filter, wherein:
the air floatation device comprises an air floatation mixing tank, a plurality of groups of dissolved air water releasers arranged at the inner bottom of the air floatation mixing tank and a dissolved air pump arranged at the outer side of the air floatation mixing tank, one end of the air floatation mixing tank is provided with an oil-containing cleaning liquid inlet and a centrifugal pump interface below the oil-containing cleaning liquid inlet, and the upper part of the other end of the air floatation mixing tank is provided with an oil phase outlet; the top and the bottom of the air floatation mixing tank, which are close to one end of the oil-containing cleaning solution inlet, are respectively provided with an oil discharge inlet and a sewage outlet; the two sides of the bottom of the air floatation mixing tank are respectively provided with a circulating outlet and a circulating inlet which are connected with the dissolved air pump, the circulating inlet is arranged between the circulating outlet and the sewage outlet, and the inlet of the dissolved air water releaser is connected with the circulating inlet below the dissolved air water releaser;
the fiber particle filter comprises a vertical tank body, and a first section of longitudinal fiber filter bed and a second section of transverse fiber filter bed which are sequentially arranged in the vertical tank body from top to bottom, wherein the first section of longitudinal fiber filter bed and the second section of transverse fiber filter bed are composed of a plurality of layers of different fiber particle materials, and a space is reserved between the bottom end of the first section of longitudinal fiber filter bed and the top end of the second section of transverse fiber filter bed; the top and bottom of the vertical tank body are respectively provided with a solution inlet and a solution outlet, the upper part of the side wall of the vertical tank body is provided with an oil discharge outlet, the oil discharge outlet is communicated with the oil discharge inlet, and the solution discharged through the interface of the centrifugal pump is conveyed to the solution inlet and the solution outlet through the centrifugal pump.
Further, a space is arranged between the inner side wall of the vertical tank body close to one side of the oil discharge outlet and the outer side wall of the section of longitudinal fiber filter bed, a vertical baffle is surrounded by the outer side wall of the section of longitudinal fiber filter bed which is not contacted with the inner side wall of the vertical tank body, and a first horizontal baffle which is connected with the inner side wall of the vertical tank body and the top end of the vertical baffle is arranged at the top of the space, so that the oil-containing cleaning liquid moves downwards longitudinally in the section of longitudinal fiber filter bed; and the vertical height of the first horizontal baffle plate is higher than the vertical height of the oil discharge outlet.
Further, the side wall of one section of longitudinal fiber filter bed far away from the oil discharge outlet is clung to the inner side wall of the vertical tank body.
Further, the outer side wall of the two-section transverse fiber filter bed is not contacted with the inner side wall of the vertical tank body, an upper horizontal baffle and a lower horizontal baffle which cover the top end face and the bottom end face of the two-section transverse fiber filter bed are respectively arranged at the top end and the bottom end of the two-section transverse fiber filter bed, one ends of the upper horizontal baffle and the lower horizontal baffle are respectively extended to be connected with the inner side wall of the vertical tank body along the horizontal direction in opposite directions, and one end of the upper horizontal baffle is extended to the inner side wall of the vertical tank body close to one side of the oil discharge outlet so as to limit the flow direction of liquid passing through the two-section transverse fiber filter bed.
Further, the first length of longitudinal fiber filter bed and the second length of transverse fiber filter bed are each comprised of three layers of different fiber particulate materials, wherein: the fiber particle materials of the first section of longitudinal fiber filter bed are oleophylic and hydrophobic fiber particle materials, and the fiber particle materials of the second section of transverse fiber filter bed are hydrophilic and oleophylic fiber particle materials; the porosity of the three-layer material of the one-section longitudinal fiber filter bed increases from top to bottom, and the porosity of the three-layer material of the two-section transverse fiber filter bed increases along with the horizontal flow direction of the liquid.
The micro oil drops in the emulsified oil are adhered to the hydrophilic and hydrophobic fiber particles and coalesce and separate under the actions of gravity, interception, inertial collision, van der Waals force and the like, so that demulsification is realized, wherein the two-stage transverse fiber filter bed prolongs the flowing distance of the oil drops under the action of the gravity and the inertia of the oil drops, and the probability of the liquid drops adhering to the hydrophilic and hydrophobic fibers is further improved.
Further, the ratio of the thickness of each layer of fiber particle material of the longitudinal fiber filter bed to the tangential length of the fiber particle filter is 0.065-0.184, and the porosities of the three layers of fiber particle material are 0.25-0.48, 0.42-0.65 and 0.54-0.87 from top to bottom respectively; the ratio of the thickness of each layer of fiber particle material of the two-section transverse fiber filter bed to the diameter of the fiber particle filter is 0.188-0.331, and the porosity of the three layers of fiber particle material layers is 0.25-0.48, 0.42-0.65 and 0.54-0.87 sequentially along with the horizontal flow direction of liquid; the fiber particle sizes of the first section of longitudinal fiber filter bed and the second section of transverse fiber filter bed are 1.5-6.3 mu m; the fibers of the first section of longitudinal fiber filter bed and the second section of transverse fiber filter bed are woven in an omega mode.
Further, a plurality of water filtering caps are uniformly distributed at the bottom of the vertical tank body below the two-section transverse fiber filter bed, a backwash inlet is arranged at the bottom of the side wall of the vertical tank body, and the backwash inlet is communicated with the bottom inlet of the water filtering cap; the bottom of the vertical tank body is provided with a backwash outlet, the bottom of the air floatation mixing tank between the circulation outlet and the oil phase outlet is provided with a backwash waste inlet, and the backwash waste inlet is communicated with the backwash outlet.
Further, the bottom surface of the air-floatation mixing tank is inclined downwards from the oil phase outlet end to the sewage outlet end so as to be convenient for the settled solid waste residues to gather at the sewage outlet, and the included angle between the bottom surface of the air-floatation mixing tank and the horizontal line is 15-35 degrees; preferably 30.
Further, the inner side end of the circulation outlet in the air floatation mixing tank is in a flaring shape, and the inner side end of the circulation outlet is positioned at 1/4 height of the air floatation mixing tank, so that solid waste residues can be effectively prevented from entering the dissolved air pump, and safe operation of the dissolved air pump is ensured. The gas introduced into the dissolved air pump is air.
Further, each dissolved air water releaser is connected in parallel, the dissolved air water releaser is of a tooth-to-tooth loop structure, and a one-way valve is arranged in the middle of the dissolved air water releaser so as to prevent the internal solution from flowing backwards; the size of the micro-bubbles generated by the dissolved air water releaser is 0.2-50 μm.
Further, a first pressure gauge is externally connected between the top end and the bottom end of the section of longitudinal fiber filter bed, a second pressure gauge is externally connected between the top end and the bottom end of the section of transverse fiber filter bed, and a drainage regulating valve is externally connected with the drainage outlet at the bottom of the fiber particle filter; the air-float mixing tank is provided with a liquid level meter and an oil-water interface meter, the top of the air-float mixing tank is provided with an exhaust port, the exhaust port is externally connected with an air regulating valve and a third pressure meter, and the oil phase outlet is externally connected with an oil phase regulating valve. The liquid level meter controls the gas-liquid interface by controlling the drainage regulating valve, and the oil-water interface meter controls the oil-water interface by controlling the oil phase regulating valve.
The invention also provides a circulating oil-water separation method of the sectional type fiber particle coupling micro-bubble by adopting the circulating oil-water separation system, which comprises the following steps:
(1) The oily cleaning fluid enters the air-floatation mixing tank, enters the fiber particle filter through the solution inlet and outlet under the pumping of the centrifugal pump, and sequentially passes through the first section of longitudinal fiber filter bed and the second section of transverse fiber filter bed to demulsify the oily cleaning fluid; meanwhile, the oil-containing cleaning liquid in the air floatation mixing tank can enter a dissolved air water releaser through a circulating inlet after dissolved air is dissolved through a dissolved air pump through a circulating outlet, high-pressure dissolved air water is subjected to floatation on the oil-containing cleaning liquid through 0.2-50 mu m micro bubbles generated by the dissolved air water releaser, and the coalesced oil phase is accumulated at the top of the air floatation mixing tank;
(2) The water phase generated after demulsification by the fiber particle filter in the step (1) is discharged to the outside through a water outlet at the bottom, and the oil phase is discharged through an oil discharge outlet and enters an air floatation mixing tank through an oil discharge inlet and then is gathered on the upper layer;
(3) Monitoring the liquid levels of the oil phase and the water phase in the air flotation mixing tank, collecting the oil phase gathered in the air flotation mixing tank through the oil phase outlet, and discharging solid-phase impurities to the outside through the sewage outlet;
the operating pressure of the air floatation mixing tank is 0.02-0.05 MPa, the operating pressure of the fiber particle filter is 0.08-0.25 MPa, and the operating pressure of the fiber particle filter is the pressure difference of the drainage regulating valve;
the pressure drop of the first section of longitudinal fiber filter bed is less than or equal to 0.02MPa, and the pressure drop of the second section of transverse fiber filter bed is less than or equal to 0.015MPa.
In the step (1), the oil-containing cleaning solution in the air-flotation mixing tank is subjected to a dissolved air pump to generate high-pressure dissolved air water, free oil and surface oil in the oil-containing cleaning solution are subjected to flotation through micro bubbles generated by a dissolved air water releaser, and the coalesced oil phase is gathered at the top of the air-flotation mixing tank; and performing coalescence removal on emulsified oil in the oil-containing cleaning fluid by using the fiber particle filter, and discharging the coalesced oil phase to an air floatation mixing tank and coalescing the coalesced oil phase at the top of the air floatation mixing tank. In the whole circulation reinforced oil-water separation process, fiber particle coalescence and air floatation oil removal are combined, and meanwhile, the free oil, the surface oil and the emulsified oil are efficiently separated.
Further, the oil content of the water phase treated by the circulating oil-water separation method of the segmented fiber particle coupled micro-bubbles is less than or equal to 0.05 percent.
Further, after the circulating oil-water separation system operates for a period of time, backwashing is required, and the specific steps of the backwashing process are as follows:
(1) Injecting back washing gas into a back washing inlet at the bottom of the fiber particle filter through a back washing gas pipeline, puffing the beds of the first section of longitudinal fiber filter bed and the second section of transverse fiber filter bed after the back washing gas is coarsely distributed through the water filtering cap, and then stopping injecting the back washing gas;
(2) Injecting backwash liquid and backwash dissolved gas into a water outlet at the bottom of the fiber particle filter through outlets of a centrifugal pump and a dissolved gas pump in sequence for coarse backwash for 2-30 min, wherein the backwash liquid is an oily cleaning liquid;
(3) Injecting backwash water into the backwash inlet through a backwash water pipeline, and backwashing the first section of longitudinal fiber filter bed and the second section of transverse fiber filter bed for 5-30 min after the backwash water is distributed through a water filtering cap; then simultaneously injecting backwash water and backwash gas to carry out gas-water combined backwash on the bed for 2-30 min, wherein the gas content is 10%;
(4) And the backwashed solid-containing waste liquid is discharged through a solution inlet and outlet at the top of the fiber particle filter and a backwashed outlet at the bottom of the fiber particle filter, enters the air floatation mixing tank through the backwashed waste residue inlet, and is discharged through a drain outlet at the bottom under the action of gravity sedimentation.
The invention has the following beneficial effects:
(1) According to the invention, a section of longitudinal fiber filter bed and a section of transverse fiber filter bed are arranged in the fiber particle filter, and by utilizing the fact that the oil and water have different affinities for two opposite coalescing materials, the oil drops tend to coalesce on the fiber surface, the particle size of the oil drops grows to a certain extent, emulsion breaking of the emulsified oil is realized under the actions of gravity, interception, diffusion, inertial collision, van der Waals force and the like, and the flowing distance of the oil drops in the bed layer is further prolonged under the actions of gravity and motion inertia of the two sections of transverse fiber filter beds, and the adhesion and coalescence efficiency of the oil drops on the fiber particles are improved.
(2) In the invention, dissolved air water generated by the dissolved air pump in the air floatation mixing tank is in the dissolved air water releaser provided with the one-way valve, and generated micro bubbles can easily adsorb hydrophobic dispersed oil drops and carry the hydrophobic dispersed oil drops to quickly float on the surface of a water body to form floating oil, so that the flotation of free oil and surface oil is realized; and the inclined bottom of the air floatation mixing tank is beneficial to the aggregation and discharge of settled solid waste residues.
(3) According to the invention, the oil-containing cleaning liquid is subjected to circulating oil-water separation by combining two modes of fiber coalescence oil removal and air flotation oil removal, so that excellent separation effect is realized, and the separation process is environment-friendly and low in energy consumption; the separation system is stable in operation and wide in oil-water quality adaptability.
(4) According to the fiber particle filter disclosed by the invention, the backwashing gas is injected through the backwashing inlet, the backwashing liquid and the backwashing dissolved gas are sequentially injected into the bottom of the fiber particle filter by the centrifugal pump and the dissolved gas pump, the backwashing water is injected into the backwashing inlet, and the backwashing water and the backwashing gas carry out the backwashing of four processes of air-water combined backwashing on the bed layer, so that solid particles in the fiber filter bed are effectively removed, and a powerful support is provided for safe and efficient operation of the fiber particle filter.
Drawings
Fig. 1 is a schematic flow chart of a circulating oil-water separation system of a sectional type fiber particle coupled micro-bubble of embodiment 1.
Fig. 2 is a schematic view of the structure of the fibrous particle filter of example 1.
Fig. 3 is a schematic structural diagram of the air-float mixing tank of example 1.
Fig. 4 is a front cross-sectional view of the dissolved air water releaser of fig. 3.
Fig. 5 is a top cross-sectional view of the dissolved air water releaser of fig. 3.
Wherein: 1. the centrifugal pump comprises a centrifugal pump body, a first pressure gauge, a second pressure gauge, a water filtering cap, a liquid level gauge, an oil-water interface gauge, a gas regulating valve, a third pressure gauge, an oil phase regulating valve, a drainage regulating valve and a water draining regulating valve, wherein the centrifugal pump body comprises a centrifugal pump body, the first pressure gauge, the second pressure gauge, the water filtering cap, the liquid level gauge, the oil-water interface gauge, the gas regulating valve, the third pressure gauge, the oil phase regulating valve and the drainage regulating valve;
100. the device comprises an air flotation device 110, an air flotation mixing tank 120, a dissolved air water releaser 130, a dissolved air pump 111, an oil-containing cleaning liquid inlet 112, a centrifugal pump interface 113, an oil phase outlet 114, an oil discharge inlet 115, a sewage outlet 116, a circulation outlet 117, a circulation inlet 118, a backwash waste inlet 121, a one-way valve 122 and an inlet of the dissolved air water releaser;
200. the filter comprises a fiber particle filter, 210, a vertical tank body, 220, a first section of longitudinal fiber filter bed, 230, a second section of transverse fiber filter bed, 211, a solution inlet, 212, a water outlet, 213, an oil discharge outlet, 214, a backwash outlet, 215, a backwash inlet, 221, a vertical baffle, 222, a first horizontal baffle, 231, an upper horizontal baffle, 232 and a lower horizontal baffle.
Detailed Description
The present invention will be specifically described below by way of examples. It is noted herein that the following examples are given solely for the purpose of further illustration and are not to be construed as limitations on the scope of the invention, as will be apparent to those skilled in the art upon examination of the following, and many other non-essential modifications and adaptations of the invention may be made without departing from its scope.
Example 1
As shown in fig. 1 to 3, the present invention provides a circulating oil-water separation system of sectional type fiber particle coupled micro-bubbles, comprising an air flotation device 100 and a fiber particle filter 200, wherein:
the air floatation device 100 comprises an air floatation mixing tank 110, a plurality of groups of dissolved air water releasers 120 arranged at the inner bottom of the air floatation mixing tank 110, and a dissolved air pump 130 arranged at the outer side of the air floatation mixing tank 110; the air-float mixing tank 110 is a horizontal tank body. One end of the air-float mixing tank 110 is provided with an oil-containing cleaning liquid inlet 111 and a centrifugal pump interface 112 below the oil-containing cleaning liquid inlet 111, and the upper part of the other end is provided with an oil phase outlet 113; the top and bottom of the air-float mixing tank 110 near one end of the oil-containing cleaning liquid inlet 111 are respectively provided with an oil discharge inlet 114 and a sewage outlet 115; the two sides of the bottom of the air-float mixing tank 110 are respectively provided with a circulation outlet 116 and a circulation inlet 117 which are connected with the dissolved air pump 130, the circulation inlet 117 is arranged between the circulation outlet 116 and the sewage outlet 115, and an inlet 122 at the bottom of the dissolved air water releaser is connected with the circulation inlet 117;
the fiber particle filter 200 comprises a vertical tank body 210, and a first section of longitudinal fiber filter bed 220 and a second section of transverse fiber filter bed 230 which are sequentially arranged in the vertical tank body 210 from top to bottom, wherein each of the first section of longitudinal fiber filter bed 220 and the second section of transverse fiber filter bed 230 is composed of a plurality of layers of different fiber particle materials, and a space is reserved between the bottom end of the first section of longitudinal particle filter bed 220 and the top end of the second section of transverse particle filter bed 230. The top and bottom ends of the vertical tank 210 are respectively provided with a solution inlet and outlet 211 and a water outlet 212, the upper part of the side wall of the vertical tank 210 is provided with an oil discharge outlet 213, the oil discharge outlet 213 is communicated with the oil discharge inlet 114 of the air flotation device 100, and the solution inlet and outlet 211 is communicated with the centrifugal pump interface 112 of the air flotation mixing tank 110 through the centrifugal pump 1 at the outer side; the oil-containing cleaning solution in the air-float mixing tank 110 is pumped by the centrifugal pump 1 through the centrifugal pump interface 112 and is conveyed into the fiber particle filter 200 through the solution inlet and outlet 211 for oil-water separation.
Further, a space is arranged between the inner side wall of the vertical tank body 210 near the oil discharge outlet 213 and the outer side wall of the section of longitudinal fiber filter bed 220, a vertical baffle 221 is surrounded by the outer side wall of the section of longitudinal fiber filter bed 220 which is not contacted with the inner side wall of the vertical tank body 210, and a first horizontal baffle 222 connected with the inner side wall of the vertical tank body 210 and the top end of the vertical baffle 221 is arranged at the top of the space so that the oil-containing cleaning liquid longitudinally flows downwards in the section of longitudinal fiber filter bed 220; the oil drain outlet 213 has a lower vertical height than the first horizontal baffle 222.
In this embodiment, a side of the section of the longitudinal fiber filter bed 220 away from the oil drain outlet 213 is closely attached to the inner sidewall of the vertical tank 210.
The outer side wall of the two-stage transversal fiber filter bed 230 is not in contact with the inner side wall of the vertical tank 210, and the top end and the bottom end of the two-stage transversal fiber filter bed 230 are respectively provided with an upper horizontal baffle 231 and a lower horizontal baffle 232 covering the top end surface and the bottom end surface of the two-stage transversal fiber filter bed 230, the upper horizontal baffle 231 and the lower horizontal baffle 232 are respectively extended along the horizontal direction toward each other to be connected with the inner side wall of the vertical tank 210, and one end of the upper horizontal baffle 231 is extended toward the inner side wall of the vertical tank 210 near the oil drain outlet 213 to limit the flow direction of the liquid passing through the two-stage transversal fiber filter bed 230. In this embodiment, the direction of fluid movement through the two-stage transverse fiber filter bed 230 is from right to left.
The first section of longitudinal fiber filter bed 220 and the second section of transverse fiber filter bed 230 are both composed of three layers of different fiber particle materials, the fiber particle materials of the first section of longitudinal fiber filter bed 220 are oleophilic hydrophobic particles, and the second section of transverse fiber filter bed 230 is hydrophilic oleophobic particles; the porosity of the three layers of material of the one section longitudinal fiber filter bed 220 increases from top to bottom, and the porosity of the three layers of material of the two section transverse fiber filter bed 230 increases from right to left.
The ratio of the thickness of each layer of fiber particle material of the one-section longitudinal fiber filter bed 220 to the tangential length of the fiber particle filter 200 is 0.065-0.184, and the porosities of the three layers of fiber particle material are 0.25-0.48, 0.42-0.65 and 0.54-0.87 from top to bottom respectively; the ratio of the thickness of each layer of fiber particle material of the two-stage transverse fiber filter bed 230 to the diameter of the fiber particle filter 200 is 0.188-0.331, and the porosity of the three layers of fiber particle material layers is 0.25-0.48, 0.42-0.65 and 0.54-0.87 in sequence along with the horizontal flow direction of the liquid; the fiber particle size of the first section 220 and the second section 230 fiber filter beds is 1.5-6.3 μm. In this embodiment, the three layers of the length of longitudinal fiber filter bed 220 have porosities of 0.34, 0.53 and 0.76, respectively, from top to bottom; the three-layer porosity of the two-stage transverse fiber filter bed 230 is 0.34, 0.53 and 0.76 in this order from right to left, and the fiber particle size of the one-stage longitudinal fiber filter bed 220 and the two-stage transverse fiber filter bed 230 is 3.5 μm. The fibers of the first section of the longitudinal fiber filter bed 220 and the fibers of the second section of the transverse fiber filter bed 230 are woven in an omega-type manner, and the weaving of the fibers is performed by referring to CN201410211201.6, which is an omega-type fiber weaving method suitable for deep oil-water separation.
Further, a first pressure gauge 2 is externally connected between the top end and the bottom end of the first section of longitudinal fiber filter bed 220, and a second pressure gauge 3 is externally connected between the top end and the bottom end of the second section of transverse fiber filter bed 230, for detecting the pressure drop between the first section of longitudinal fiber filter bed 220 and the second section of transverse fiber filter bed 230.
A plurality of water filtering caps 4 are uniformly distributed at the bottom of the vertical tank body 210 below the two-section transverse fiber filter bed 230, a backwash inlet 215 is arranged at the bottom of the side wall of the vertical tank body 210, and the backwash inlet 215 is communicated with the bottom inlet of the water filtering caps 4; the bottom of the vertical tank 210 is provided with a backwash outlet 214, the bottom of the air-float mixing tank 110 between the circulation outlet 116 and the oil phase outlet 113 is provided with a backwash waste inlet 118, and the backwash waste inlet 118 is communicated with the backwash outlet 214.
Further, the bottom surface of the air-float mixing tank 110 is inclined downwards from the oil phase outlet 113 to the sewage outlet 115 so that the settled solid waste residues are gathered at the sewage outlet 115, the included angle between the bottom surface of the air-float mixing tank 110 and the horizontal line is 15-35 °, and in this embodiment, the included angle between the bottom surface of the air-float mixing tank 110 and the horizontal line is 30 °.
In this embodiment, the inner side end of the circulation outlet 116 located in the air-float mixing tank 110 is in a flared shape, and the inner side end of the circulation outlet 116 is located at 1/4 of the height of the air-float mixing tank 110, which can effectively prevent solid waste residues from entering the dissolved air pump 130, and ensure safe operation of the dissolved air pump 130.
As shown in fig. 3 to 5, in this embodiment, there are 4 sets of gas-water dissolved releasers 120 connected in parallel. Each dissolved air water releaser 120 has a tooth-to-tooth loop structure, the dissolved air water releaser 120 is located at 1/4 height of the air-float mixing tank 110, and a one-way valve 121 is disposed at the inner side of the inlet 122 of the dissolved air water releaser to prevent the back flow of the internal solution, and the size of the micro-bubbles generated by the dissolved air water releaser 120 is 0.2 μm-50 μm.
As shown in fig. 1, a liquid level meter 5 and an oil-water level meter 6 are installed on the air-float mixing tank 110, an air outlet is formed in the top of the air-float mixing tank 110, an air regulating valve 7 and a third pressure meter 8 are externally connected to the air outlet, an oil phase regulating valve 9 is externally connected to the oil phase outlet 113, the liquid level meter 5 is used for monitoring the oil-gas liquid level, and the oil-water level meter 6 is used for monitoring the oil-water liquid level; the drain outlet 212 at the bottom of the fiber particle filter 200 is externally connected with a drain adjusting valve 10, and the drain adjusting valve 10 is connected with the liquid level meter 5 for adjusting and controlling the oil drain process.
The invention also provides a circulating oil-water separation method of the segmented fiber particle coupling micro-bubbles by adopting the device, which comprises the following steps:
(1) The oil-containing cleaning fluid enters the air-float mixing tank 110 through the oil-containing cleaning fluid inlet 111, enters through the top end of the fiber particle filter 200 under the pumping of the centrifugal pump 1, and passes through the first section of longitudinal fiber filter bed 220 and the second section of transverse fiber filter bed 230 in sequence to demulsify the oil-containing cleaning fluid; meanwhile, the oil-containing cleaning solution in the air floatation mixing tank 110 enters the dissolved air water releaser 120 through the circulation inlet 117 after being dissolved by the dissolved air pump 130 through the circulation outlet 116, the high-pressure dissolved air water is subjected to floatation by the micro bubbles of 0.2-50 μm generated by the dissolved air water releaser 120, and the coalesced oil phase is accumulated at the top of the air floatation mixing tank 110;
(2) The water phase generated after demulsification by the fiber particle filter 200 in the step (1) is discharged to the outside through the drain outlet 212 at the bottom, the oil phase is discharged through the oil discharge outlet 213 and enters the air-float mixing tank 110 through the oil discharge inlet 114 and is accumulated at the upper layer,
(3) Monitoring and adjusting the liquid level of the oil phase and the water phase in the air-float mixing tank 110, collecting the oil phase collected in the air-float mixing tank 110 through the oil phase outlet 113, and discharging solid phase impurities to the outside through the sewage outlet 115;
the operation pressure of the air floatation mixing tank 110 is 0.02-0.05 MPa;
the operating pressure of the fiber particle filter 200 is 0.08-0.25 MPa, preferably 0.1MPa in the present embodiment;
the pressure drop of the first section of longitudinal fiber filter bed 220 is controlled to be less than or equal to 0.02MPa, and the pressure drop of the second section of transverse fiber filter bed 230 is controlled to be less than or equal to 0.015MPa.
As shown in fig. 1, after the circulating oil-water separation system operates for a period of time, a backwashing is required, and specific steps of the backwashing process are as follows:
(1) Injecting backwash gas into a backwash inlet 215 at the bottom of the fiber particle filter 200 through a backwash gas pipeline, puffing the beds of the first section of longitudinal fiber filter bed 220 and the second section of transverse fiber filter bed 230 after the backwash gas is coarsely distributed through the water filtering cap 4, and then stopping injecting backwash gas;
(2) Sequentially injecting an oil-containing cleaning fluid and backwash dissolved gas into a water outlet 212 at the bottom of the fiber particle filter 200 through outlets of the centrifugal pump 1 and the dissolved gas pump 130 for coarse backwash for 2-30 min;
(3) The backwash water is injected into the backwash inlet 215 through a backwash water pipeline, and after the backwash water is distributed through the water filtering cap 4, the beds of the first section of longitudinal fiber filtering bed 220 and the second section of transverse fiber filtering bed 230 are backwashed for 5-30 min; and then the backwash water and backwash gas are injected through the backwash inlet 215 at the same time to perform gas-water combined backwash on the bed for 2-30 min, and the gas content is 10%.
(4) The backwashed solid-containing waste liquid is discharged through a solution inlet and outlet 211 at the top of the fiber particle filter 200 and a backwashed outlet 214 at the bottom, enters the air floatation mixing tank 110 from a backwashed waste residue inlet 118, and finally is discharged through a bottom drain outlet 115 under the action of gravity sedimentation.
The device and the method are adopted by a petrochemical company to treat the generated oil-containing cleaning liquid. The oil-containing cleaning liquid produced by the company has the flow of 2.5m 3 And/h, the oil content is 10000mg/L, and the solid content is 0.1%. The nominal diameter of the fibrous particle filter 200 is 800mm, the tangential length 1850mm of the vessel, wherein each layer of the first length of the longitudinal fibrous filter bed 220 has a longitudinal thickness of 270mm, and each layer of the second length of the transverse fibrous filter bed 230 has a transverse thickness of 200mm; the nominal diameter of the air-float mixing tank 110 is 1200mm, and the tangential length of the container is 2400mm.
The oil-containing cleaning liquid first enters the air-float mixing tank 110 through the oil-containing cleaning liquid inlet 111, enters the interior from the solution inlet/outlet 211 at the top of the fiber particle filter 200 under suction of the centrifugal pump 1, and sequentially passes through the first-stage longitudinal fiber filter bed 220 and the second-stage transverse fiber filter bed 230. The oil phase is introduced into the air-float mixing tank 110 through the oil discharge outlet 213 from the oil discharge inlet 114 at the upper part thereof, and is collected as an oil phase at the top of the tank.
In the air-float mixing tank 110, the solution is pressurized by the dissolved air pump 130 and released by the dissolved air water releaser 120 under pressure, and the generated micro bubbles collide and adhere with micro oil drops in the solution; under the bridging action of the microbubbles, the oil drops agglomerate into large oil drops which rise to the top of the air floatation mixing tank 110 through buoyancy, and the large oil drops are gathered to form an oil layer. The liquid level meter 5 and the gas regulating valve 7 which are arranged on the air floatation mixing tank 110 are used for controlling the oil discharging process, and when the pressure P3 in the third pressure meter 8 is more than 50kPa, the gas regulating valve 7 is opened; when the pressure P3 is less than 20kPa, the air regulating valve 7 is closed. The liquid level meter 5 is connected with the drainage regulating valve 10, and the liquid level meter 5 controls the oil gas liquid level L1 to be at N.L (normal level) of the liquid level meter 5 through the drainage regulating valve 10, and the distance from N.L to the top of the air floatation mixing tank is 200mm. When the oil-water boundary L2 is larger than 450mm, the oil-water boundary gauge 6 controls the oil regulating valve 9 to be closed, and when the oil-water boundary L2 is smaller than 300mm, the oil regulating valve 9 is opened.
The oil phase generated after the treatment is recovered through an oil phase outlet 113, and the water content is not more than 5%; the water phase is discharged to the outside from a water outlet 212 at the bottom of the fiber particle filter 200, and the oil content of the water phase is not more than 10ppm; the generated solid phase waste residue is discharged through the drain 115.
In conclusion, the water content in the oil phase of the oil-containing cleaning solution treated by the device is not more than 5%, the oil content in the water phase is not more than 10ppm, and the oil-water separation effect is remarkable.
Example 2
The oil-containing cleaning liquid produced by a petrochemical company is treated by the circulating oil-water separation system and the method, and parameters of devices in the separation system are the same as those in the embodiment 1. The oil-containing cleaning liquid produced by the company has a flow rate of 3.7m 3 And/h, oil content 15000mg/L and solid content 0.25%.
The oil phase generated after the treatment of the circulating oil-water separation system is recovered through an oil phase outlet 113, and the water content is not more than 5.8%; the water phase is discharged to the outside from a water outlet 212 at the bottom of the fiber particle filter 200, and the oil content of the water phase is not more than 15ppm; the generated solid-phase waste residue is discharged through the sewage outlet 115, and the oil-water separation effect is remarkable.
Example 3
The oil-containing cleaning liquid produced by a petrochemical company is treated by the circulating oil-water separation system and the method, and parameters of devices in the separation system are the same as those in the embodiment 1. The oil-containing cleaning liquid produced by the company has a flow of 1.5m 3 And/h, oil content 6422mg/L and solid content 0.08%.
The oil phase generated after the treatment of the circulating oil-water separation system is recovered through an oil phase outlet 113, and the water content is not more than 4.5%; the water phase is discharged to the outside from a water outlet 212 at the bottom of the fiber particle filter 200, and the oil content of the water phase is not more than 10ppm; the generated solid phase waste residue is discharged through the drain 115.
Example 4
The oil-containing cleaning liquid produced by a petrochemical company is treated by the circulating oil-water separation system and the method, and parameters of devices in the separation system are the same as those in the embodiment 1. The oil-containing cleaning liquid produced by the company is 0.86m in flow rate 3 And/h, oil content 1283mg/L and solid content 0.03%.
The oil phase generated after the treatment of the circulating oil-water separation system is recovered through an oil phase outlet 113, and the water content is not more than 2.9%; the water phase is discharged to the outside from a water outlet 212 at the bottom of the fiber particle filter 200, and the oil content of the water phase is not more than 8ppm; the generated solid phase waste residue is discharged through the drain 115.
In summary, the oil-water separation of the oil-containing cleaning liquid is performed by the segmented fiber particle coupled micro-bubble circulating oil-water separation system, so that an excellent oil-water separation effect can be realized, and the adaptability to oil-water quality is wide.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (9)
1. The utility model provides a circulating oil water separation system of sectional type fiber particle coupling microbubble which characterized in that includes air supporting device and fiber particle filter, wherein:
the air floatation device comprises an air floatation mixing tank, a plurality of groups of dissolved air water releasers arranged at the inner bottom of the air floatation mixing tank and a dissolved air pump arranged at the outer side of the air floatation mixing tank, one end of the air floatation mixing tank is provided with an oil-containing cleaning liquid inlet and a centrifugal pump interface below the oil-containing cleaning liquid inlet, and the upper part of the other end of the air floatation mixing tank is provided with an oil phase outlet; the top and the bottom of the air floatation mixing tank, which are close to one end of the oil-containing cleaning solution inlet, are respectively provided with an oil discharge inlet and a sewage outlet; the two sides of the bottom of the air floatation mixing tank are respectively provided with a circulating outlet and a circulating inlet which are connected with the dissolved air pump, the circulating inlet is arranged between the circulating outlet and the sewage outlet, and the inlet of the dissolved air water releaser is connected with the circulating inlet below the dissolved air water releaser;
the fiber particle filter comprises a vertical tank body, and a first section of longitudinal fiber filter bed and a second section of transverse fiber filter bed which are sequentially arranged in the vertical tank body from top to bottom, wherein the first section of longitudinal fiber filter bed and the second section of transverse fiber filter bed are composed of a plurality of layers of different fiber particle materials, and a space is reserved between the bottom end of the first section of longitudinal fiber filter bed and the top end of the second section of transverse fiber filter bed; the top end and the bottom end of the vertical tank body are respectively provided with a solution inlet and a solution outlet, the upper part of the side wall of the vertical tank body is provided with an oil discharge outlet, the oil discharge outlet is communicated with the oil discharge inlet, and the solution discharged through the centrifugal pump interface is conveyed to the solution inlet and the solution outlet through a centrifugal pump;
the first section of longitudinal fiber filter bed and the second section of transverse fiber filter bed are each comprised of three layers of different fiber particulate materials, wherein: the fiber particle materials of the first section of longitudinal fiber filter bed are oleophylic and hydrophobic fiber particle materials, and the fiber particle materials of the second section of transverse fiber filter bed are hydrophilic and oleophylic fiber particle materials; the porosity of the three-layer material of the one-section longitudinal fiber filter bed increases from top to bottom, and the porosity of the three-layer material of the two-section transverse fiber filter bed increases along with the horizontal flow direction of the liquid.
2. The segmented fiber particle-coupled microbubble circulating oil-water separation system as set forth in claim 1, wherein a space is provided between the inner side wall of the vertical tank body and the outer side wall of the section of longitudinal fiber filter bed near the oil discharge outlet, and the outer side wall of the section of longitudinal fiber filter bed, which is not in contact with the inner side wall of the vertical tank body, is surrounded by a vertical baffle plate, a first horizontal baffle plate is provided at the top of the space, which connects the inner side wall of the vertical tank body and the top end of the vertical baffle plate, and the vertical height of the first horizontal baffle plate is higher than the vertical height of the oil discharge outlet.
3. The circulating oil-water separation system of sectional fiber particle coupling microbubbles according to claim 1, wherein the outer side wall of the two-section transverse fiber filter bed is not contacted with the inner side wall of the vertical tank body, the top end and the bottom end of the two-section transverse fiber filter bed are respectively provided with an upper horizontal baffle and a lower horizontal baffle which cover the top end surface and the bottom end surface of the two-section transverse fiber filter bed, one ends of the upper horizontal baffle and the lower horizontal baffle are respectively extended along the horizontal direction to be connected with the inner side wall of the vertical tank body, and one ends of the upper horizontal baffle are extended towards the inner side wall of the vertical tank body near the oil discharge outlet side.
4. The segmented fiber particle coupled microbubble circulating oil-water separation system of claim 1, wherein the ratio of the thickness of each layer of fiber particle material to the tangential length of the fiber particle filter in the one-stage longitudinal fiber filter bed is 0.065-0.184, and the porosities of the three layers of fiber particle material are 0.25-0.48, 0.42-0.65 and 0.54-0.87 from top to bottom, respectively; the ratio of the thickness of each layer of fiber particle material of the two-section transverse fiber filter bed to the diameter of the fiber particle filter is 0.188-0.331, and the porosity of the three layers of fiber particle material layers is 0.25-0.48, 0.42-0.65 and 0.54-0.87 sequentially along with the horizontal flow direction of liquid; the fiber particle sizes of the first section of longitudinal fiber filter bed and the second section of transverse fiber filter bed are 1.5-6.3 mu m; the fibers of the first section of longitudinal fiber filter bed and the second section of transverse fiber filter bed are woven in an omega mode.
5. The circulating oil-water separation system of sectional fiber particle coupling microbubbles of claim 1, wherein a plurality of water filtering caps are uniformly distributed at the bottom of the vertical tank body below the two-section transverse fiber filtering bed, a backwash inlet is arranged at the bottom of the side wall of the vertical tank body, and the backwash inlet is communicated with the bottom inlet of the water filtering cap; the bottom of the vertical tank body is provided with a backwash outlet, the bottom of the air floatation mixing tank between the circulation outlet and the oil phase outlet is provided with a backwash waste inlet, and the backwash waste inlet is communicated with the backwash outlet.
6. The segmented fiber particle coupled microbubble circulating oil-water separation system as set forth in claim 1, wherein the bottom surface of the air-float mixing tank is inclined downward from the oil phase outlet end to the drain outlet end, and the bottom surface of the air-float mixing tank has an angle of 15-35 ° with the horizontal line.
7. The segmented fiber particle-coupled microbubble circulating oil-water separation system as set forth in claim 1, wherein each of said gas-water-dissolving releasers is connected in parallel, said gas-water-dissolving releasers are of a tooth-to-tooth loop structure, and a one-way valve is provided in the middle of said gas-water-dissolving releasers to prevent backflow of the internal solution.
8. A method for separating circulating oil from water by coupling segmented fiber particles with microbubbles, comprising the steps of:
(1) The oily cleaning fluid enters an air floatation mixing tank, enters a fiber particle filter through a solution inlet and outlet under the pumping of a centrifugal pump, and sequentially passes through a first section of longitudinal fiber filter bed and a second section of transverse fiber filter bed to demulsify the oily cleaning fluid; meanwhile, the oil-containing cleaning liquid in the air floatation mixing tank also enters a dissolved air water releaser through a circulating inlet after dissolved air is dissolved through a dissolved air pump through a circulating outlet, high-pressure dissolved air water is subjected to floatation on the oil-containing cleaning liquid through 0.2-50 mu m micro bubbles generated by the dissolved air water releaser, and the coalesced oil phase is accumulated at the top of the air floatation mixing tank;
(2) The water phase generated after demulsification by the fiber particle filter in the step (1) is discharged to the outside through a water outlet at the bottom, and the oil phase is discharged through an oil discharge outlet and enters an air floatation mixing tank through an oil discharge inlet and then is gathered on the upper layer;
(3) Monitoring the liquid levels of the oil phase and the water phase in the air flotation mixing tank, collecting the oil phase gathered in the air flotation mixing tank through the oil phase outlet, and discharging solid-phase impurities to the outside through the sewage outlet;
the operating pressure of the air floatation mixing tank is 0.02-0.05 MPa, and the operating pressure of the fiber particle filter is 0.08-0.25 MPa;
the pressure drop of the first section of longitudinal fiber filter bed is less than or equal to 0.02MPa, and the pressure drop of the second section of transverse fiber filter bed is less than or equal to 0.015MPa.
9. The method for circulating oil-water separation of sectional type fiber particle coupling micro-bubbles according to claim 8, wherein the oil content of the water phase treated by the method for circulating oil-water separation of sectional type fiber particle coupling micro-bubbles is less than or equal to 0.05%.
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| JPH10192848A (en) * | 1997-01-08 | 1998-07-28 | Nec Tohoku Ltd | Waste water treatment apparatus and waste water treatment method thereof |
| CN108341509A (en) * | 2018-04-19 | 2018-07-31 | 南京中船绿洲环保有限公司 | A kind of high-performance oil and water treatment equipment |
| CN112919571A (en) * | 2021-01-26 | 2021-06-08 | 华东理工大学 | Air flotation reinforced multistage fiber coalescence oil removal device and method |
| CN113461196A (en) * | 2021-07-27 | 2021-10-01 | 华东理工大学 | Fiber particle combined double-bubble enhanced oil-water separation complete equipment and method |
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| CN111170552B (en) * | 2018-11-13 | 2022-04-05 | 上海华畅环保设备发展有限公司 | Oily sewage pretreatment method and device without air floatation |
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| JPH10192848A (en) * | 1997-01-08 | 1998-07-28 | Nec Tohoku Ltd | Waste water treatment apparatus and waste water treatment method thereof |
| CN108341509A (en) * | 2018-04-19 | 2018-07-31 | 南京中船绿洲环保有限公司 | A kind of high-performance oil and water treatment equipment |
| CN112919571A (en) * | 2021-01-26 | 2021-06-08 | 华东理工大学 | Air flotation reinforced multistage fiber coalescence oil removal device and method |
| CN113461196A (en) * | 2021-07-27 | 2021-10-01 | 华东理工大学 | Fiber particle combined double-bubble enhanced oil-water separation complete equipment and method |
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