CN106830426B - Supergravity sewage treatment device and process - Google Patents
Supergravity sewage treatment device and process Download PDFInfo
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- CN106830426B CN106830426B CN201710116753.2A CN201710116753A CN106830426B CN 106830426 B CN106830426 B CN 106830426B CN 201710116753 A CN201710116753 A CN 201710116753A CN 106830426 B CN106830426 B CN 106830426B
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention relates to a supergravity sewage treatment device, which is characterized in that firstly, a filter and a membrane component are utilized to pretreat electric desalting sewage, then alkali liquor in an alkali liquor tank and sewage treated by the filter and the membrane component are mixed and enter the supergravity machine through a fluid channel of the supergravity machine, a unique supergravity machine structure and a rotating channel which is formed between a hollow rotating shaft and a sleeve and is communicated with a filling area and provided with a spiral channel are utilized, so that fluid is enabled to enter through the rotating channel after passing through the hollow rotating shaft, and the sewage and alkali liquor in the fluid are fully mixed under the rotating action force, shearing force and the spinning action force of the fluid at the moment of entering the filling area, the sufficiency of liquid-liquid contact is improved, and the removal of oil substances and COD (chemical oxygen demand) in the sewage by the alkali liquor is realized.
Description
Technical Field
The invention relates to a supergravity sewage treatment device, and belongs to the technical field of sewage treatment.
Background
Sewage is one of the common industrial wastes in the modern industry, and depending on its source, sewage contains various harmful substances such as heavy metals, organic matters, microorganisms, etc. In view of the form of the harmful substances, a part of the harmful substances are water-soluble, and the other part of the harmful substances are in an oily form. In general, it is necessary to perform appropriate physical or chemical treatment on the sewage containing any of the above-mentioned harmful substances, or the sewage in any form in which the harmful substances exist, so that the sewage can meet the national discharge requirements for such sewage when it is discharged.
At present, common sewage treatment methods include a physical method, a physicochemical method, a chemical method and a biological method. Wherein, the physical method is a physical or mechanical separation method, and concretely comprises a precipitation method, a filtration method and a centrifugal separation method.
The physicochemical method is a physicochemical separation method, including gas stripping, adsorption, extraction, ion exchange, reverse osmosis, electroosmosis, etc.
The chemical method is a process of converting harmful substances into harmless substances through chemical reaction by adding chemical substances into sewage, and comprises neutralization, oxidation, reduction, chemical precipitation and the like.
The biological method is a metabolic reaction process for carrying out microbial oxidation and decomposition on organic matters in sewage by utilizing microorganisms, and comprises the steps of activated sludge, a biological filter tank, anaerobic reaction and the like.
When sewage is treated by the method, the difficulty in treating the sewage containing oil is the most difficult. In the objective, the oil in water is mainly divided into a free state, an emulsified state and a dissolved state, wherein the free state and the emulsified state occupy a large specific gravity, especially the emulsified state has the largest specific gravity, so that how to realize the removal of the emulsified state oil in the wastewater is a key sign of the treatment of the oily sewage. At present, most of sewage treatment adopts chemical methods, and a certain treatment effect can be achieved by combining a plurality of chemical methods and biological methods. Even so, improvement in the treatment effect is demanded.
Therefore, providing a proper sewage treatment device to realize the effective treatment of oily sewage is a problem to be solved urgently at present.
Disclosure of Invention
The invention provides a supergravity sewage treatment device, which aims to realize deoiling and COD removal treatment of oily sewage by using supergravity. The invention further provides a hypergravity sewage treatment process.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the supergravity sewage treatment device is characterized by being provided with a storage tank for storing electric desalting sewage or air stripping sewage, and a filter is connected with a sewage outlet of the storage tank;
the membrane assembly is connected with the sewage outlet of the filter and consists of a multi-stage tubular membrane assembly, and the multi-stage tubular membrane assembly is provided with a concentrated water outlet and a purified water outlet;
the device is also provided with a solution tank for storing demulsifiers and a supergravity machine;
the hypergravity machine is provided with a shell, a hollow rotating shaft driven by power is arranged on the central axis of the shell and penetrates through the shell, a fluid channel is arranged in the rotating shaft, and a sealable fluid inlet is arranged on the rotating shaft; the fluid inlet is connected with the concentrated water outlet and the alkali liquor outlet of the alkali liquor tank at the same time;
a sleeve is coaxially sleeved outside the rotating shaft and connected with the rotating shaft, so that a channel is formed between the rotating shaft and the inner wall of the sleeve, the rotating shaft extends towards the sleeve to form a plurality of rotating channels, and a convex or concave spiral channel is arranged in the rotating channels; the rotating channel penetrates through the sleeve;
a packing cylinder is coaxially sleeved with the rotating shaft and the sleeve, and a packing area is formed in the packing cylinder; the rotary channel is communicated with the filling area;
a fluid outlet is arranged on the shell and is communicated with the filling area;
the fluid outlet is also connected to the separator.
The filter comprises a primary filter and a secondary filter, wherein the filtering pore diameter of the primary filter is smaller than 50um, and the filtering pore diameter of the secondary filter is smaller than 5um.
The sum of inlet diameters of the plurality of rotary channels is equal to or smaller than the inner diameter of the hollow rotary shaft.
The packing area is provided with a plurality of layers of packing, and the rotating shaft is connected with the motor.
The alkali liquor outlet of the alkali liquor tank is connected with the fluid inlet of the supergravity machine through a power pump, and the concentrated water outlet is connected with the fluid inlet of the supergravity machine through the power pump.
The rotating channels are perpendicular to the rotating shaft.
A hypergravity sewage treatment process comprises the following treatment steps:
(1) Filtering and impurity removing treatment is carried out on high-concentration sewage such as electric desalting sewage or air stripping sewage at 40-60 ℃ to remove impurity particles with the particle size larger than 50 um;
(2) Cooling the purified sewage to 40-60 ℃;
(3) The cooled sewage is pressurized to 0.3-3.0MPa, the temperature is set to 40-60 ℃, the sewage enters a membrane module, the membrane material of the membrane module is a high-hydrophilicity super-oleophobic membrane, water permeates the membrane, oil is concentrated and enriched on the water inlet side, and oil-water separation is achieved;
(4) The concentrated oil after membrane separation and the concentrated water of impurities and the demulsifier enter the fluid inlet of the supergravity machine in a rotating state, spin into a filling area after passing through a rotating channel, and are mixed in the filling area under the action of centrifugal force, so that oil-water separation is realized.
In the step (3), it is composed of a primary membrane separation treatment for separating substances larger than 50um and a secondary membrane separation treatment for separating substances larger than 5um.
The membrane separation is PC6040 roll type membrane separation;
the demulsifier is alkali liquor.
The membrane separation cleaning device is also arranged for cleaning and back-cleaning the membrane component.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. according to the high-gravity sewage treatment device, a high-gravity machine is introduced for the first time in the sewage treatment field, a filter and a membrane component are firstly utilized to pretreat high-concentration sewage such as electric desalted sewage, then a demulsifier in an alkali liquid tank and concentrated water in the sewage treated by the filter and the membrane component are mixed and enter the high-gravity machine through a fluid channel of the high-gravity machine, a unique high-gravity machine structure and a rotating channel which is formed between a hollow rotating shaft and a sleeve and is communicated with a filler area and provided with a spiral channel are adopted, the fluid is enabled to enter the hollow rotating shaft through the rotating channel, the circumferential speed is increased at the moment of entering the filler area under the rotating action force, the shearing force and the spinning action of the fluid, the generated centrifugal force pushes the fluid to the outer edge, the fluid is cut, broken and dispersed by the filler in the filler area in the process, so that a micron-to-nanometer liquid film, liquid drops and liquid wires are formed, a huge and quick-updated phase interface is generated, the flowing contact is generated in the filler of a plurality of curved pore canals, the sewage and the demulsifier are fully mixed, the full contact of the fluid in the fluid and the sewage is enabled to be enabled, the full contact of the water and the water in the oil-water and the oil is enabled to be fully separated under the action of the rotating action force of the rotating force and the spinning action of the fluid, and the water in the demulsifier are enabled to be fully removed, and the water in the oil demulsifying agent is fully separated, and the water and the water in the oil has been separated water and water in the water has been high demulsifying effect.
2. The super-gravity sewage treatment device is further provided with a plurality of rotary channels, wherein the sum of the diameters of the inlets of the rotary channels is equal to or smaller than the inner diameter of the hollow rotating shaft, so that the inner diameter of the rotary channels is ensured to be in a proper interval, the spin speed and the spin state of fluid are ensured, and the sufficient contact of two mixed liquids in the fluid in a filling area is further improved.
3. According to the hypergravity sewage treatment process, firstly, impurity removal treatment is required under a heating condition, and high-concentration sewage is subjected to primary treatment; then cooling the material to ensure that the temperature reaches 30-50 ℃; and then, the most important separation treatment is carried out on the sewage by utilizing the membrane component under the action of pressure and temperature, and the proper pressure and temperature are set in the step to effectively control the separation degree of the membrane component on the sewage, ensure that the separated concentrated water is suitable for entering the subsequent supergravity treatment, realize the full mixing of the sewage in the fluid and the demulsifier, improve the full degree of liquid-liquid contact, ensure that the demulsifier is fully contacted with water-in-oil molecules in the concentrated water, fully demulsifie the water-in-oil molecules in the concentrated water, improve the oil-water separation capacity, and realize the removal of oil substances and COD in the sewage by the demulsifier, thereby obtaining excellent sewage treatment results.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings, in which
FIG. 1 is a schematic diagram of the structure of the hypergravity sewage treatment device according to the present invention;
the reference numerals in the drawings are as follows: 1-storage tank, 2-alkali liquid tank, 3-supergravity machine, 4-primary filter, 5-secondary filter, 6-membrane module, 7-dense water outlet, 8-purified water outlet, 9-shell, 10-rotating shaft, 11-fluid channel, 12-fluid inlet, 13-fluid outlet, 14-sleeve, 15-rotating channel, 16-packing cylinder and 17-packing area.
Detailed Description
Example 1
The invention relates to a supergravity sewage treatment device, which comprises a storage tank 1 for storing electric desalting sewage or air stripping sewage, an alkali liquor tank 2 for storing demulsifier and a supergravity machine 3; wherein the purpose of selecting a suitable lye is to contact exchange with the electro-desalted sewage to remove impurities to be removed.
A filter is arranged in connection with the sewage outlet of the storage tank 1; a membrane module 6 is arranged in connection with the sewage outlet of the filter, wherein the membrane module 6 is preferably selected to consist of a multi-stage tubular membrane module 6, and the multi-stage tubular membrane module 6 is provided with a concentrated water outlet 7 and a purified water outlet 8; wherein the purified water outlet 8 can be directly discharged to a sewage purification treatment plant for further subsequent treatment.
The supergravity machine 3 is provided with a shell 9, a fluid outlet is arranged on the shell 9, a hollow rotating shaft 10 driven by power is arranged on the central axis of the shell 9 and penetrates through the shell 9, and for the selection of power, the hollow rotating shaft 10 is connected with a motor in the embodiment to realize the driving rotation of the hollow rotating shaft 10 after the motor is started. In addition, a fluid channel 11 is arranged in the rotating shaft 10, and a sealable fluid inlet 12 is arranged on the rotating shaft 10; the fluid inlet 12 is connected with the concentrated water outlet 7 and the alkali liquor outlet of the alkali liquor tank 2 at the same time; a sleeve 14 is coaxially sleeved and connected with the rotating shaft 10 outside the rotating shaft 10, so that a channel is formed between the rotating shaft 10 and the inner wall of the sleeve 14, the rotating shaft 10 is provided with a plurality of rotating channels 15 extending towards the sleeve 14, and the rotating channels 15 are internally provided with convex or concave spiral channels; the rotary passage 15 is provided through the sleeve 14;
a packing cylinder 16 is coaxially sleeved with the rotating shaft 10 and the sleeve 14, and a packing area 17 is formed in the packing cylinder 16; the rotary channels 15 and the fluid outlets are all in communication with a packing area 17. The setting of the packing area 17 needs to be selected according to actual engineering, and packing can be integrally filled or laid in multiple layers, so that the packing area 17 is set to be a multi-layer packing area 17, and the purpose is to ensure that when the supergravity machine 3 works, the full rotary cutting of two liquids under the action of multi-layer packing of the packing area 17 is realized by rotation.
A fluid outlet 13 is provided on the housing 9, said fluid outlet 13 being in communication with the packing region 17; the fluid outlet 13 is also connected to a separator.
As a preferred embodiment, on the basis of the above example, it is preferable to provide that the filter is composed of a primary filter 4 and a secondary filter 5, wherein the filter pore size of the primary filter 4 is smaller than 50um, and the filter pore size of the secondary filter 5 is smaller than 5um.
As a preferred embodiment, it is preferable that the sum of inlet diameters of the plurality of rotation channels 15 is equal to or smaller than the inner diameter of the hollow rotation shaft 10. Of course, in practical engineering implementation, it is necessary to set different relationships between the inlet diameter and the dimension of the hollow shaft 10 according to the requirements of the treated object and the treatment effect. Also, preferably, a plurality of rotating passages 15 are provided perpendicular to the rotating shaft 10, thereby facilitating the flow of fluid.
More preferably, on the basis of the embodiment, the alkali liquor outlet of the alkali liquor tank 2 is connected with the fluid inlet 12 of the hypergravity machine 3 through a power pump, so that the alkali liquor can enter the hypergravity machine 3 through the fluid inlet 12 more smoothly. For the same purpose, the concentrated water outlet 7 and the fluid inlet 12 of the supergravity machine 3 are also optionally connected by a power pump.
In the hypergravity sewage treatment device, high-concentration sewage such as electric desalting sewage or air stripping sewage is filtered by a primary filter 4 and a secondary filter 5 at first and then is subjected to further purification membrane treatment by a multi-stage membrane assembly 6, concentrated water is discharged through a concentrated water outlet 7, and the discharged concentrated water enters a fluid inlet 12 of a hypergravity machine 3 through a power pump; at the same time, the lye in the lye tank 2 also enters the fluid inlet 12 of the supergravity machine 3 via the power pump. After entering through the fluid inlet 12, the concentrated water and the alkali liquor enter the fluid channel 11 of the hollow rotating shaft 10 and flow to the inlet of the rotating channel 15, enter the rotating channel 15 again through the inlet of the rotating channel 15, form the rotating flow of the fluid under the drainage effect of the convex or concave spiral channel inside the rotating channel 15, enter the packing area 17 communicated with the channel under the effect, and form the spin acting force and the spin flow direction of the fluid at the moment of entering the packing area 17. The demulsifier and the concentrated water are subjected to rotation acting force, shearing force and fluid spin acting force at the moment when entering the packing area 17, the circumferential speed is increased, the generated centrifugal force pushes the fluid to the outer edge, the fluid is cut, broken and dispersed by the packing in the packing area 17 in the process, so that micron-to-nanometer liquid films, liquid drops and liquid wires are formed, huge and rapid updated phase interfaces are generated, flow contact is generated in the packing of a plurality of curved pore channels, mass transfer process and chemical reaction of the concentrated water and alkali liquor are caused, the full mixing of sewage and the demulsifier in the fluid is realized, the contact degree of liquid and liquid is improved, the water molecules in oil in the demulsifier and the concentrated water are fully contacted, the oil molecules in the concentrated water are fully demulsified, and the oil-water separation capacity is improved, so that the demulsifier can remove oil substances and COD in sewage, and demulsification can be successfully realized. The fluid then leaves the supergravity machine 3 via the fluid outlet 13.
Example 2
The invention relates to a hypergravity sewage treatment process, which comprises the following treatment steps:
(1) Filtering and impurity removing treatment is carried out on the electric desalting sewage at 40 ℃ to filter out the impurity particles with the particle size larger than 50 um;
(2) Cooling the purified sewage to 40 ℃;
(3) The cooled sewage is pressurized to 0.3MPa, the temperature is set to 40 ℃, the sewage enters a membrane module, the membrane material of the membrane module is a high-hydrophilicity super-oleophobic membrane, water permeates the membrane, oil is concentrated and enriched on the water inlet side, and oil-water separation is achieved;
(4) The concentrated oil after membrane separation and the concentrated water of impurities and the demulsifier enter the fluid inlet of the supergravity machine in a rotating state, spin into a filling area after passing through a rotating channel, and are mixed in the filling area under the action of centrifugal force, so that oil-water separation is realized.
Example 3
The invention relates to a hypergravity sewage treatment process, which comprises the following treatment steps:
(1) Filtering and impurity removing treatment is carried out on the air stripping sewage at 50 ℃ to filter out the impurity particles with the particle size larger than 50 um;
(2) Cooling the purified sewage to 50 ℃;
(3) The cooled sewage is pressurized to 1.0MPa, the temperature is set to 50 ℃, the sewage enters a membrane module, the membrane material of the membrane module is a high-hydrophilicity super-oleophobic membrane, water permeates the membrane, oil is concentrated and enriched on the water inlet side, and oil-water separation is achieved;
(4) The concentrated oil after membrane separation and the concentrated water of impurities and the demulsifier enter the fluid inlet of the supergravity machine in a rotating state, spin into a filling area after passing through a rotating channel, and are mixed in the filling area under the action of centrifugal force, so that oil-water separation is realized.
Example 4
The invention relates to a hypergravity sewage treatment process, which comprises the following treatment steps:
(1) Filtering and impurity removing treatment is carried out on the electric desalting sewage at 60 ℃ to filter out the impurity particles with the particle size larger than 50 um;
(2) Cooling the purified sewage to 60 ℃;
(3) The cooled sewage is pressurized to 3.0MPa, the temperature is set to 60 ℃, the sewage enters a membrane module, the membrane material of the membrane module is a high-hydrophilicity super-oleophobic membrane, water permeates the membrane, oil is concentrated and enriched on the water inlet side, and oil-water separation is achieved;
(4) The concentrated oil after membrane separation and the concentrated water of impurities and the demulsifier enter the fluid inlet of the supergravity machine in a rotating state, spin into a filling area after passing through a rotating channel, and are mixed in the filling area under the action of centrifugal force, so that oil-water separation is realized.
Example 5
The invention relates to a hypergravity sewage treatment process, which comprises the following treatment steps:
(1) Performing secondary filtration and impurity removal treatment on the electric desalting sewage at 60 ℃ to filter out machine impurity particles with the particle size of more than 50 um;
(2) Cooling the purified sewage to 50 ℃;
(3) The cooled sewage is pressurized to 3.0MPa, the temperature is set to 60 ℃, the sewage enters a membrane module, the membrane material of the membrane module is a high-hydrophilicity super-oleophobic membrane, water permeates the membrane, oil is concentrated and enriched on the water inlet side, and oil-water separation is achieved; the membrane treatment in this step consists of a primary membrane separation treatment for separating substances greater than 50um and a secondary membrane separation treatment for separating substances greater than 5um.
(4) The concentrated oil after membrane separation and the concentrated water of impurities and the demulsifier enter the fluid inlet of the supergravity machine in a rotating state, spin into a filling area after passing through a rotating channel, and are mixed in the filling area under the action of centrifugal force, so that oil-water separation is realized.
In the hypergravity sewage treatment device and the treatment process, a membrane separation cleaning device is also arranged to clean and back-clean the membrane component.
Comparative example 1
The invention relates to a hypergravity sewage treatment process, which comprises the following treatment steps:
(1) Filtering and impurity removing treatment is carried out on the electric desalting sewage at normal temperature, and mechanical impurity particles with the particle size of more than 50um are filtered;
(2) Cooling the purified sewage to 60 ℃;
(3) The cooled sewage is pressurized to 3.0MPa, the temperature is set to 60 ℃, the sewage enters a membrane module, the membrane material of the membrane module is a high-hydrophilicity super-oleophobic membrane, water permeates the membrane, oil is concentrated and enriched on the water inlet side, and oil-water separation is achieved;
(4) The concentrated oil after membrane separation and the concentrated water of impurities and the demulsifier enter the fluid inlet of the supergravity machine in a rotating state, spin into a filling area after passing through a rotating channel, and are mixed in the filling area under the action of centrifugal force, so that oil-water separation is realized.
Comparative example 2
The invention relates to a hypergravity sewage treatment process, which comprises the following treatment steps:
(1) Filtering and impurity removing treatment is carried out on the electric desalting sewage at 60 ℃ to filter out the impurity particles with the particle size larger than 50 um;
(2) Cooling the purified sewage to 60 ℃;
(3) The cooled sewage enters a membrane module, the membrane material of the membrane module is a high-hydrophilicity super-oleophobic membrane, water permeates the membrane, oil is concentrated and enriched on the water inlet side, and oil-water separation is achieved;
(4) The concentrated oil after membrane separation and the concentrated water of impurities and the demulsifier enter the fluid inlet of the supergravity machine in a rotating state, spin into a filling area after passing through a rotating channel, and are mixed in the filling area under the action of centrifugal force, so that oil-water separation is realized.
The films used in the examples and comparative examples were PC6040 roll film; the demulsifier is alkali liquor.
Test case
The invention adopts the electric desalting sewage and the stripping sewage for testing, and the ratio of the oil substances in the electric desalting sewage adopted in the test is 500mg/nm 3 COD is 5000-30000mg/nm 3 . The ratio of the oil substances in the gas stripping sewage is 200mg/nm 3 COD is 5000mg/nm 3 。
After sewage treatment, tests show that the results are as follows:
while the invention has been particularly shown and described with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention encompassed by the appended claims.
Claims (10)
1. The supergravity sewage treatment device is characterized by being provided with a storage tank for storing electric desalting sewage or air stripping sewage, and a filter is connected with a sewage outlet of the storage tank;
the membrane assembly is connected with the sewage outlet of the filter and consists of a multi-stage tubular membrane assembly, and the multi-stage tubular membrane assembly is provided with a concentrated water outlet and a purified water outlet;
the device is also provided with a solution tank for storing demulsifiers and a supergravity machine;
the hypergravity machine is provided with a shell, a hollow rotating shaft driven by power is arranged on the central axis of the shell and penetrates through the shell, a fluid channel is arranged in the rotating shaft, and a sealable fluid inlet is arranged on the rotating shaft; the fluid inlet is connected with the concentrated water outlet and the alkali liquor outlet of the alkali liquor tank at the same time;
a sleeve is coaxially sleeved outside the rotating shaft and connected with the rotating shaft, so that a channel is formed between the rotating shaft and the inner wall of the sleeve, the rotating shaft extends towards the sleeve to form a plurality of rotating channels, and a convex or concave spiral channel is arranged in the rotating channels; the rotating channel penetrates through the sleeve;
a packing cylinder is coaxially sleeved with the rotating shaft and the sleeve, and a packing area is formed in the packing cylinder; the rotary channel is communicated with the filling area; the filler can be integrally filled or laid in multiple layers;
a fluid outlet is arranged on the shell and is communicated with the filling area;
the fluid outlet is also connected to the separator.
2. The hypergravity wastewater treatment device of claim 1, wherein the filter comprises a primary filter and a secondary filter, the primary filter having a filtration pore size of less than 50um and the secondary filter having a filtration pore size of less than 5um.
3. The high gravity sewage treatment device according to claim 1 or 2, wherein a sum of inlet diameters of the plurality of the rotating passages is equal to or smaller than an inner diameter of the hollow rotating shaft.
4. The high gravity sewage treatment device according to claim 3, wherein the packing area is provided with a plurality of packing layers, and the rotating shaft is connected with the motor.
5. The high gravity sewage treatment device according to claim 1, 2 or 4, wherein the lye outlet of the lye tank is connected with the fluid inlet of the high gravity machine by a power pump, and the concentrate outlet is connected with the fluid inlet of the high gravity machine by a power pump.
6. The high gravity sewage treatment device according to claim 5, wherein the rotation channels are each arranged perpendicular to the rotation shaft.
7. A process for treating high gravity sewage by using the high gravity sewage treatment device according to any one of claims 1 to 6, comprising the steps of:
(1) Filtering and impurity removing treatment is carried out on the high-concentration sewage of the electric desalting sewage or the air stripping sewage at the temperature of 40-60 ℃ to filter out the impurity particles with the particle size of more than 50 um;
(2) Cooling the purified sewage to 40-60 ℃;
(3) The cooled sewage is pressurized to 0.3-3.0MPa, the temperature is set to 40-60 ℃, the sewage enters a membrane module, the membrane material of the membrane module is a high-hydrophilicity super-oleophobic membrane, water permeates the membrane, oil is concentrated and enriched on the water inlet side, and oil-water separation is achieved;
(4) The concentrated oil after membrane separation and the concentrated water of impurities and the demulsifier enter the fluid inlet of the supergravity machine in a rotating state, spin into a filling area after passing through a rotating channel, and are mixed in the filling area under the action of centrifugal force, so that oil-water separation is realized.
8. The process according to claim 7, wherein in the step (3), the process is composed of a primary membrane separation process for separating substances of more than 50um and a secondary membrane separation process for separating substances of more than 5um.
9. The process according to claim 7 or 8, wherein the membrane separation is PC6040 roll membrane separation;
the demulsifier is alkali liquor.
10. The process according to claim 7 or 8, wherein a membrane separation washing device is further provided to wash and back-wash the membrane module.
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