CN111606461A - Oil-salt-containing sewage treatment system and treatment method based on solar energy storage - Google Patents
Oil-salt-containing sewage treatment system and treatment method based on solar energy storage Download PDFInfo
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- CN111606461A CN111606461A CN202010410037.7A CN202010410037A CN111606461A CN 111606461 A CN111606461 A CN 111606461A CN 202010410037 A CN202010410037 A CN 202010410037A CN 111606461 A CN111606461 A CN 111606461A
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4696—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrophoresis
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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
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The system comprises a breakdown filter connected with a sewage pretreatment unit through a first valve to receive sewage at a preset flow rate so as to separate the sewage into oil and water, a dielectrophoresis oil-water separator electrically connected with a storage battery and connected with the breakdown filter through a second valve so as to separate the sewage into oil and water, an electro-adsorption desalination device input end connected with a water side post-treatment end through a third valve so as to introduce water, a positive electrode plate and a negative electrode plate of the electro-adsorption desalination device are respectively connected with a reverse electrode controller, the reverse electrode controller is connected with the storage battery, wherein when the third valve is opened, the positive electrode plate and the negative electrode plate generate electric field electro-adsorption water quality salt so as to separate the salt in the water, a polar plate cleaning device is connected with the electro-adsorption desalination device through a fourth valve, when the third valve is closed, the fourth valve is opened, and the polar plate cleaning device cleans the positive and negative polar plates.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an oil-salt-containing sewage treatment system and method based on solar energy storage.
Background
During oil extraction, transportation, handling, processing and use, pollution due to oil leakage and discharge is increasing, and about 400 million tons of oil are leaked or discharged into the marine environment every year around the world. Moreover, industrial production, aerospace, domestic wastewater, national defense facilities and the like all have the requirements on purifying water containing oil and impurities and oil containing water and impurities, and purifying water containing oil and impurities and oil containing water and impurities is an important link of related production processes, is an important means for improving the product quality and economic benefit, and is also a standard-reaching requirement of environmental protection emission.
The oil in the oil-containing water can be divided into floating oil, dispersed oil, emulsified oil and dissolved oil according to the particle size of oil droplets, most of the floating oil and about 1/4 emulsified oil and impurity micelles with particle diameters larger than 10um can be removed through the existing sedimentation separation device, but the remaining extremely small amount of floating oil, about 3/4 emulsified oil and impurity micelles with particles between 3 and 10um are not removed, because the simple oil particles and the simple solid particles are separated from water in the flowing process by using the property of different densities, but the oil particles contain small water droplets or the oil particles contain solid particles, the density of the composite particles is basically consistent with the density of water, and the separation by using the method is difficult.
The existing oil-water purification technology comprises a chemical method, a microbiological method, a physical method and the like. But the chemical method is easy to cause secondary pollution, and the oil after flocculation separation is not easy to recover and has high cost. The microbiological method is harsh in conditions, and colony populations are easy to degenerate and vary. The physical methods include a centrifugal method, a rotational flow method, a sedimentation method, a gas flotation method and the like, and all the methods are long in time consumption and low in efficiency.
The advanced treatment desalination technology for the ocean water and industrial sewage with leaked petroleum is mainly a double-membrane process, namely UF + RO, but because UF and RO in the process are particularly sensitive to oil and heavy metals and the influence of factors such as unstable water temperature and variable dosage at the front section and the like, the double-membrane process has low water yield, frequent membrane replacement, high failure rate and the like in practical application. Therefore, the operation effect is not ideal, the whole process flow is not smooth, the qualified rate of effluent is difficult to ensure, and the return water quality of a water system is influenced. In actual engineering, although strict pretreatment means is adopted for the above situations, the operation effect is still difficult to improve.
The waste water and the sewage are treated and reused, so that not only can precious water resources be saved, but also the sewage discharge can be greatly reduced, the natural environment in which human beings rely on to live is protected, and the method has important significance for the sustainable development of human life and economy. Solar energy is used as the largest renewable natural resource of human beings, has the characteristics of cleanness, low price and inexhaustibility, and becomes an important direction for solving the dual crisis of energy and environment. Solar energy is used for oil-water separation, and the energy source for brine separation has profound application value. Therefore, the search for new efficient, low energy, reliable and sustainable solar oil-water separation, the brine separation mode has become a necessary trend.
The above information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is well known to those of ordinary skill in the art.
Disclosure of Invention
In view of the above problems, the present invention provides a system and a method for treating oil-containing salt sewage based on solar energy storage to overcome the above disadvantages of the prior art. The purpose of the invention is realized by the following technical scheme.
An oil-salt-containing sewage treatment system based on solar energy storage comprises,
a solar photovoltaic panel which absorbs sunlight and converts the sunlight into electric energy,
a storage battery connected to the solar photovoltaic panel to store the electric energy,
a sewage pretreatment unit which precipitates oil-salt-containing sewage to be treated to separate impurities,
a demulsification filter connected to the sewage pretreatment unit via a first valve to receive sewage at a predetermined flow rate such that the sewage is separated into layers,
the dielectrophoresis oil-water separator is electrically connected with the storage battery, the dielectrophoresis oil-water separator is connected with the demulsification filter through a second valve so as to separate oil and water from sewage water, wherein the oil is led out through the oil side post-treatment end, the water is led out through the water side post-treatment end, the dielectrophoresis oil-water separator comprises an insulating special-shaped film used for generating an uneven electric field, the oil is polarized by the uneven electric field so as to be separated from the oil water, the insulating special-shaped film is of a nano-scale truncated cone-shaped structure, the truncated cone-shaped structure comprises an inlet with a first diameter and an outlet with a second diameter larger than the first diameter, the electric field intensity of the inlet is smaller than that of the outlet, and under the action of the uneven electric field, the oil is,
the input end of the electro-adsorption desalination device is connected with the water side post-processing end through a third valve so as to lead in water quality, a positive electrode plate and a negative electrode plate of the electro-adsorption desalination device are respectively connected with a reverse electrode controller, the reverse electrode controller is connected with the storage battery, when the third valve is opened, the positive electrode plate and the negative electrode plate generate an electric field to electrically adsorb salt in the water quality so as to separate the salt in the water quality, and the water quality after the salt separation is led out through a water outlet final processing end,
and the polar plate cleaning device is connected with the electro-adsorption desalting device through a fourth valve, when the third valve is closed, the fourth valve is opened, the polar plate cleaning device cleans the positive and negative polar plates, and the cleaned fluid is led out through the cleaning post-treatment end.
In the oily salt sewage treatment system based on solar energy power storage, the electro-adsorption desalination device comprises a plurality of supporting plates, the upper surfaces of the supporting plates are provided with upper polar plates, the lower surfaces of the supporting plates are provided with lower polar plates, and a flow channel for water circulation is formed between the upper polar plates and the lower polar plates.
In the oily salt sewage treatment system based on solar energy storage, the upper polar plate and the lower polar plate of each flow channel are respectively connected with the pole reversing controller as a whole.
In the oily salt sewage treatment system based on solar energy storage, the upper polar plate or the lower polar plate comprises activated carbon fibers.
In the oil-salt-containing sewage treatment system based on solar energy storage, the sewage pretreatment unit comprises a sedimentation tank and a filtering unit. And when the third valve is closed, the electrode reversing controller stops supplying power to the electro-adsorption desalination device.
In the oily salt sewage treatment system based on solar energy storage, the polarity of the positive electrode plate and the polarity of the negative electrode plate are periodically switched by the electrode reversing controller.
In the oily salt sewage treatment system based on solar energy storage, the polar plate cleaning device comprises a nozzle for washing the positive polar plate and the negative polar plate.
According to another aspect of the invention, a treatment method of the oil-salt-containing sewage treatment system based on solar energy storage comprises the following steps,
the solar photovoltaic panel absorbs sunlight and converts the sunlight into electric energy, the storage battery stores the electric energy,
the sewage pretreatment unit deposits the oily salt-containing sewage to be treated to separate impurities, the emulsion breaking filter receives the sewage at a preset flow velocity to separate the oil from the water in the sewage,
the dielectrophoresis oil-water separator separates oil and water in the sewage into oil and water, wherein the oil is led out from the oil side post-treatment end, the water is led out from the water side post-treatment end,
when the third valve is opened, the positive electrode plate and the negative electrode plate generate an electric field to electrically adsorb the salt in the water quality so as to separate the salt in the water quality, the water quality after the salt separation is led out through the water outlet final treatment end, when the third valve is closed, the fourth valve is opened, the electrode plate cleaning device cleans the positive electrode plate and the negative electrode plate, the cleaned fluid is led out through the cleaned treatment end, and the negative electrode plate is switched by the reverse electrode controller to carry out the electro-adsorption desalting in the next period.
Compared with the prior art, the invention has the beneficial effects that:
the photovoltaic panel is used for collecting solar energy and generating electricity at the same time, and supplying electric energy required by the operation of a system; the dielectrophoresis oil-water separation device remarkably improves the oil-water separation efficiency of the sewage; the electro-adsorption desalting device is used for carrying out salt water separation on the sewage; the polarity reversing controller can control the switching of the positive and negative poles of the electrode plate of the electric adsorption device, so that the negative and positive ions of the positive and negative electrode plates are released in a combined manner, and the reduction of the utilization rate due to the occupation of the electrode plate space is avoided. Meanwhile, when the positive electrode and the negative electrode are switched, the polar plate of the electro-adsorption device is washed, so that the high efficiency of the device is maintained, the device has remarkable social benefit and circular economic benefit, and can be widely applied to the field of high-oil high-salt wastewater purification.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly apparent, and to make the implementation of the content of the description possible for those skilled in the art, and to make the above and other objects, features and advantages of the present invention more obvious, the following description is given by way of example of the specific embodiments of the present invention.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. Also, like parts are designated by like reference numerals throughout the drawings.
In the drawings:
FIG. 1 is a schematic structural diagram of an oily salt wastewater treatment system based on solar power storage according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a profiled membrane of a solar storage based oil and salt containing wastewater treatment system according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of an electro-adsorption desalination device of an oil-salt-containing sewage treatment system based on solar energy storage according to an embodiment of the invention.
The invention is further explained below with reference to the figures and examples.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to fig. 1 to 3. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
For the purpose of facilitating understanding of the embodiments of the present invention, the following description will be made by taking specific embodiments as examples with reference to the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present invention.
For better understanding, as shown in fig. 1 to 3, an oil-salt-containing sewage treatment system based on solar power storage includes,
a solar photovoltaic panel 2 which absorbs sunlight and converts the sunlight into electric energy,
a storage battery 5 connected to the solar photovoltaic panel 2 to store the electric energy,
a sewage pretreatment unit 1 which precipitates oil-salt-containing sewage to be treated to separate impurities,
a demulsifying filter 3 connected to the sewage pretreatment unit 1 via a first valve 13 to receive sewage at a predetermined flow rate, so that the sewage is separated into oil and water layers,
a dielectrophoresis oil-water separator 4 which is electrically connected with the storage battery 5, the dielectrophoresis oil-water separator 4 is connected with the emulsion breaking filter 3 through a second valve 14 to separate the sewage oil and the water into oil and water, wherein the oil is led out through the oil side post-processing end 7 and the water is led out through the water side post-processing end 8,
the input end of the electro-adsorption desalination device 10 is connected with the water side post-processing end 8 through a third valve 16 so as to lead in water quality, a positive electrode plate and a negative electrode plate of the electro-adsorption desalination device 10 are respectively connected with a reverse electrode controller 6, the reverse electrode controller 6 is connected with the storage battery 5, wherein when the third valve 16 is opened, the positive electrode plate and the negative electrode plate generate an electric field to electrically adsorb salt in the water quality so as to separate the salt in the water quality, the water quality after the salt separation is led out through a water outlet final processing end 12,
and the polar plate cleaning device 9 is connected with the electro-adsorption desalination device 10 through a fourth valve 17, when the third valve 16 is closed, the fourth valve 17 is opened, the polar plate cleaning device 9 cleans the positive and negative polar plates, and the cleaned fluid is led out through the cleaned processing end 11.
In the preferred embodiment of the oil-salt-containing sewage treatment system based on solar energy storage, the dielectrophoresis oil-water separator 4 comprises an insulating profiled membrane 15 for generating a non-uniform electric field, which polarizes oil to separate oil from water.
In the preferred embodiment of the oily salt sewage treatment system based on solar energy storage, the insulating special-shaped film 15 is a nano-scale truncated cone-shaped structure, the truncated cone-shaped structure comprises an inlet with a first diameter and an outlet with a second diameter larger than the first diameter, the electric field intensity of the inlet is smaller than that of the outlet, and under the action of the uneven electric field, oil is polarized to be far away from the inlet.
In the preferred embodiment of the oily salt sewage treatment system based on solar energy storage, the electro-adsorption desalination device 10 comprises a plurality of support plates 18, wherein an upper polar plate is arranged on the upper surface of each support plate 18, a lower polar plate is arranged on the lower surface of each support plate 18, and a flow channel for water to flow is formed between the upper polar plate and the lower polar plate 19.
In the preferred embodiment of the oily salt sewage treatment system based on solar energy storage, the upper polar plate and the lower polar plate of each flow passage are respectively connected with the pole reversing controller 6 as a whole.
In the preferred embodiment of the oily salt sewage treatment system based on solar energy storage, the upper polar plate or the lower polar plate comprises activated carbon fibers.
In the preferred embodiment of the oil-salt-containing sewage treatment system based on solar energy storage, the sewage pretreatment unit 1 comprises a sedimentation tank and a filtering unit. When the third valve 16 is closed, the reverse polarity controller 6 stops supplying power to the electro-adsorption desalination device 10.
In the preferred embodiment of the oily salt wastewater treatment system based on solar energy storage, the polarity of the positive electrode plate and the polarity of the negative electrode plate are periodically switched by the polarity reversing controller 6.
In the preferred embodiment of the solar storage based oil-salt-containing sewage treatment system, the plate cleaning device 9 comprises nozzles for washing the positive and negative electrode plates.
In the preferred embodiment of the oily salt sewage treatment system based on solar energy storage, the treatment system comprises a solar cell module, a flow path module mainly comprising a dielectrophoresis separator and an electro-adsorption desalination device 10, and a cleaning and electrode reversing module of the electro-adsorption device.
The solar cell module includes:
and the solar photovoltaic panel 2 absorbs sunlight and converts the sunlight into electric energy.
And the storage battery 5 is used for storing the converted electric energy, supplying power to the dielectrophoresis separation device and the electro-adsorption desalination device 10 and realizing connection with the pole-reversing module.
In the solar cell module, solar energy can be absorbed and stored while supplying power requirements of the entire system. The invention can realize the purposes of energy saving and environmental protection, and has the advantages of independent and autonomous system power supply and no external interference.
The flow path module includes:
the sewage pretreatment is to carry out precipitation, chemical treatment, filtration and other treatment on the original sewage so as not to hinder the subsequent treatment.
And the demulsification filter 3 is used for completely destroying the oil-water mixture emulsion to form two immiscible phases, namely eliminating the stabilization condition of the oil-water emulsion to ensure that dispersed liquid drops are aggregated and layered.
The dielectrophoresis oil-water separator 4 utilizes the characteristic that uncharged particles suspended in a medium solution generate polarization in a non-uniform electric field to generate directional motion. A special insulating special-shaped membrane 15 is arranged in the middle of the separator to ensure that the electric field intensity at the inlet side of the nano-holes on the membrane is smaller than that at the outlet. When the upper and lower plates 19 are energized and the oil drop particles approach or enter the nanopores in the membrane due to the flow, the non-uniform electric field around the pores causes the oil drop particles to polarize and move out of the pores. I.e. oil droplets do not pass through the membrane, thereby achieving oil-water separation.
An oil side post-treatment end 7 which performs different post-treatments on the separated oil as required to meet the requirements.
And a water side post-treatment end 8 for post-treating the separated high-salt-containing sewage according to requirements.
The electro-adsorption desalination apparatus 10 uses the high-concentration waste salt-containing sewage to flow between the cathode and the anode, and ions in the water migrate to the electrodes with opposite charges and are adsorbed in the electric double layer on the surfaces of the electrodes, thereby realizing the desalination effect.
And (4) final effluent treatment, which is to carry out different post-treatments on the separated water according to requirements so as to meet the requirements.
In the flow path module, a special insulating special-shaped film 15 is arranged in the dielectrophoresis oil-water separator 4, and a plurality of small holes similar to truncated cones are arranged in the special insulating special-shaped film. Because of the change of the shape, a non-uniform electric field appears in the membrane when the membrane is electrified, the electric field intensity of the hole inlet is smaller than that of the hole outlet, and oil drops can not pass through the membrane, so that further oil-water separation is realized.
In the flow path module, the dielectrophoresis separator is a novel oil-water separation device. The advantage is that no chemical or biological agents need to be added; the high pressure is not required to be added as the prior oil-water separator 4; besides electric energy, consumable wearing parts are not needed, and the cost is low; high efficiency, long service life, thorough separation and the like.
In the flow path module, the electro-adsorption desalination device 10 adopts a multistage parallel arrangement structure, electrodes made of activated carbon fibers are arranged on the support plates 18, and a flow channel is formed between the adjacent support plates 18 and is used in parallel, so that the length of the flow channel is greatly shortened, the resistance is reduced, and the electro-adsorption desalination device is conveniently connected with the inverted pole module.
The pole of falling of electro-adsorption device and washing module includes:
and the electrode reversing controller 6 controls the electric energy stored in the storage battery 5 to periodically switch the power supply modes of the positive electrode and the negative electrode of the electro-adsorption desalination device 10 so as to realize the electrode reversing of the electrode plate of the electro-adsorption device.
And the polar plate cleaning device 9 is used for flushing and cleaning the polar plate when the electric adsorption device is powered off.
And (4) treating after cleaning, wherein the water after cleaning is treated and utilized according to requirements.
In the pole reversing and cleaning module of the electric adsorption device, the pole reversing controller 6 can control the switching of the positive pole and the negative pole of the polar plate of the electric adsorption device, so that the anions and the cations of the positive and the negative polar plates are released in a combined manner, and the reduction of the utilization rate due to the occupation of the polar plate space is avoided. Meanwhile, when the anode and the cathode are switched, the polar plate of the electro-adsorption device is washed, so that the high efficiency of the device is kept. In addition, in the electro-adsorption parallel structure, the positive electrode and the negative electrode are respectively led out by using a lead and are converged in two paths of the electrode reversing controller 6, so that the adjustment is convenient.
To further understand the present invention, in one embodiment, as shown in FIG. 1, a solar-powered high-oil high-salt wastewater purification system includes a solar cell module, a flow path module with a dielectrophoretic separator and an electro-adsorption desalination device as the main components, and a cleaning and polarity inverting module for the electro-adsorption device.
For the solar cell module, a plurality of solar photovoltaic panels 2 are used to absorb energy and store the energy in a storage battery 5. The dielectrophoresis oil-water separator 4 is powered by power distribution control, and the electro-adsorption desalination device 10 is powered by connection with the polarity reversing controller 6.
For the flow path module, firstly, sewage pretreatment 1 is carried out on sewage containing waste oil and waste salt, and impurities such as sediment and sludge are eliminated. Secondly, the sewage is led into the demulsification filter 3 at a proper flow rate by adjusting the size of the first valve 13, so that the oil and the water can be conveniently separated into two immiscible phases. And thirdly, adjusting the size of the valve of the second valve 14, introducing the sewage into the dielectrophoresis oil-water separator 4, realizing oil-water separation, and performing the oil-side post-treatment end 7 and the water-side post-treatment end 8. And then, adjusting the size of a valve of the third valve 16, introducing the sewage containing the waste salt into the electro-adsorption desalting device 10 to realize water-salt separation, and performing water outlet final treatment at the water outlet end 12.
For the electrode reversing and cleaning module of the electro-adsorption device, after the electro-adsorption desalination device 10 carries out a period of desalination process, the third valve 16 is controlled to close the flow path where the electro-adsorption desalination device is located, the electrode reversing controller 6 stops energizing the electro-adsorption desalination device 10, the fourth valve 17 is controlled to open the flow path where the electro-adsorption desalination device is located, the electrode plate cleaning device 9 is started to clean the electrode plate, and then the cleaned electrode plate is processed by the processing end 11. After the cleaning of the polar plate is finished, the switching of the anode and the cathode of the polar plate is realized by using the pole-reversing controller 6, and the electro-adsorption desalting in the next period is carried out.
In one embodiment, as shown in fig. 2, an insulating film having irregular truncated cone-like nanopores is provided in the middle of the separator, a non-uniform electric field occurs in the pores, and the electric field intensity at the pore entrance is less than that at the pore exit. When the upper and lower polar plates are electrified and the oil drop particles are in the film, the non-uniform electric field formed in the holes enables the oil drop particles to generate polarization action and move to the upper parts of the holes. I.e. oil droplets do not pass through the membrane, thereby achieving oil-water separation.
In one embodiment, as shown in fig. 3, activated carbon fibers are arranged on the support plate 18 as electrode material 19 to form a flow channel adjacent to the support plate for parallel use. The upper and lower polar plates of each flow channel are respectively connected with the pole-reversing controller 6 as a whole. The advantages are that the length of the flow channel can be greatly shortened, and the resistance is reduced; is easily systematically regulated by the pole-reversing controller 6.
The treatment method of the oily salt sewage treatment system based on solar energy storage comprises the following steps,
the solar photovoltaic panel 2 absorbs sunlight and converts the sunlight into electric energy, the storage battery 5 stores the electric energy,
the sewage pretreatment unit 1 precipitates oil-salt-containing sewage to be treated to separate impurities, the emulsion breaking filter 3 receives the sewage at a predetermined flow rate to separate the oil from the water in the sewage,
the dielectrophoresis oil-water separator 4 separates the oil and water in the sewage into oil and water, wherein the oil is led out through the oil side post-treatment end 7 and the water is led out through the water side post-treatment end 8,
when the third valve 16 is opened, the positive electrode plate and the negative electrode plate generate an electric field to electrically adsorb salt in water so as to separate the salt in the water, the water after being separated from salt is discharged from the water outlet final treatment end 12, when the third valve 16 is closed, the fourth valve 17 is opened, the electrode plate cleaning device 9 cleans the positive electrode plate and the negative electrode plate, the cleaned fluid is discharged from the cleaned treatment end 11, and the negative electrode plate is switched by the reverse electrode controller 6 to perform electro-adsorption desalting in the next period.
Industrial applicability
The oil-salt-containing sewage treatment system and method based on solar energy storage can be manufactured and used in the field of sewage treatment.
The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (8)
1. An oil-salt-containing sewage treatment system based on solar energy storage comprises,
a solar photovoltaic panel which absorbs sunlight and converts the sunlight into electric energy,
a storage battery connected to the solar photovoltaic panel to store the electric energy,
a sewage pretreatment unit which precipitates oil-salt-containing sewage to be treated to separate impurities,
a demulsification filter connected to the sewage pretreatment unit via a first valve to receive sewage at a predetermined flow rate such that the sewage is separated into layers,
the dielectrophoresis oil-water separator is electrically connected with the storage battery, the dielectrophoresis oil-water separator is connected with the demulsification filter through a second valve so as to separate oil and water from sewage water, wherein the oil is led out through the oil side post-treatment end, the water is led out through the water side post-treatment end, the dielectrophoresis oil-water separator comprises an insulating special-shaped film used for generating an uneven electric field, the oil is polarized by the uneven electric field so as to be separated from the oil water, the insulating special-shaped film is of a nano-scale truncated cone-shaped structure, the truncated cone-shaped structure comprises an inlet with a first diameter and an outlet with a second diameter larger than the first diameter, the electric field intensity of the inlet is smaller than that of the outlet, and under the action of the uneven electric field, the oil is,
the input end of the electro-adsorption desalination device is connected with the water side post-processing end through a third valve so as to lead in water quality, a positive electrode plate and a negative electrode plate of the electro-adsorption desalination device are respectively connected with a reverse electrode controller, the reverse electrode controller is connected with the storage battery, when the third valve is opened, the positive electrode plate and the negative electrode plate generate an electric field to electrically adsorb salt in the water quality so as to separate the salt in the water quality, and the water quality after the salt separation is led out through a water outlet final processing end,
and the polar plate cleaning device is connected with the electro-adsorption desalting device through a fourth valve, when the third valve is closed, the fourth valve is opened, the polar plate cleaning device cleans the positive and negative polar plates, and the cleaned fluid is led out through the cleaning post-treatment end.
2. The oily salt sewage treatment system based on solar energy storage of claim 1, wherein preferably, the electro-adsorption desalination device comprises a plurality of support plates, the upper surface of each support plate is provided with an upper polar plate, the lower surface of each support plate is provided with a lower polar plate, and a flow channel for water to flow is formed between the upper polar plate and the lower polar plate.
3. The solar power storage-based oily salt wastewater treatment system as claimed in claim 2, wherein the upper plate and the lower plate of each flow passage are respectively connected with the inverted pole controller as a whole.
4. The solar power storage-based oily salt wastewater treatment system of claim 2, wherein the upper plate or the lower plate comprises activated carbon fibers.
5. The solar-electricity-storage-based oily salt wastewater treatment system as claimed in claim 1, wherein the wastewater pretreatment unit comprises a sedimentation tank and a filtration unit, and when the third valve is closed, the electrode reversing controller stops supplying power to the electro-adsorption desalination device.
6. The solar-storage-based oil-and salt-containing sewage treatment system of claim 1, wherein the polarity of the positive electrode plate and the negative electrode plate is periodically switched by the polarity reversing controller.
7. The solar-storage-based oil-and-salt-containing sewage treatment system of claim 1, wherein the plate cleaning device comprises nozzles for washing the positive and negative electrode plates.
8. A treatment method of the oily salt-containing sewage treatment system based on the solar energy storage according to any one of claims 1 to 7, which comprises the following steps,
the solar photovoltaic panel absorbs sunlight and converts the sunlight into electric energy, the storage battery stores the electric energy,
the sewage pretreatment unit deposits the oily salt-containing sewage to be treated to separate impurities, the emulsion breaking filter receives the sewage at a preset flow velocity to separate the oil from the water in the sewage,
the dielectrophoresis oil-water separator separates oil and water in the sewage into oil and water, wherein the oil is led out from the oil side post-treatment end, the water is led out from the water side post-treatment end,
when the third valve is opened, the positive electrode plate and the negative electrode plate generate an electric field to electrically adsorb the salt in the water quality so as to separate the salt in the water quality, the water quality after the salt separation is led out through the water outlet final treatment end, when the third valve is closed, the fourth valve is opened, the electrode plate cleaning device cleans the positive electrode plate and the negative electrode plate, the cleaned fluid is led out through the cleaned treatment end, and the negative electrode plate is switched by the reverse electrode controller to carry out the electro-adsorption desalting in the next period.
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