CN110902933A - Wastewater treatment method and wastewater treatment system - Google Patents
Wastewater treatment method and wastewater treatment system Download PDFInfo
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- CN110902933A CN110902933A CN201911343510.8A CN201911343510A CN110902933A CN 110902933 A CN110902933 A CN 110902933A CN 201911343510 A CN201911343510 A CN 201911343510A CN 110902933 A CN110902933 A CN 110902933A
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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
- C02F1/40—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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
Abstract
The invention provides a wastewater treatment method and a wastewater treatment system, and relates to the technical field of wastewater treatment. According to the wastewater treatment method provided by the invention, the primarily treated wastewater can be further adsorbed by the super-wetting magnetic beads, and the defect of poor separation effect of the super-magnetic separation equipment on emulsified oil and dissolved oil micromolecule pollutants in the prior art can be overcome, so that the oily wastewater is treated, and the purified water is obtained.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment method and a wastewater treatment system.
Background
With the rapid development of industrial economy, the discharge amount of oily wastewater is increasing day by day. In addition to oily wastewater generated by oil extraction, oil storage, transportation and processing and various leakage events in the oil industry, a large amount of oily wastewater is generated in other industries such as a steel rolling process in the steel industry, mine construction in the coal industry, a turning process in the mechanical industry, food processing, catering and the like, so that serious environmental and social hazards are caused. The prior treatment technology of oily wastewater mainly comprises a flocculation method, an adsorption method, a membrane separation method and a magnetic separation method.
The magnetic separation method is a separation technique which utilizes the difference of magnetic potential of elements or components and treats substances by means of an external magnetic field so as to strengthen the separation process. Due to the advantages of low energy consumption, high separation efficiency, small occupied area, low environmental pollution and the like, the super-magnetic separation technology is widely applied to the fields of coal mine wastewater, steel rolling wastewater and oil field wastewater treatment. At present, the supermagnetic separation equipment has extremely high separation efficiency on wastewater treatment, but has a good removal effect on particle type pollutants, macromolecular organic matters, heavy metal substances, salt ions and the like, and has a poor separation effect on small molecular organic pollutants such as emulsified oil and dissolved oil, so that the application of the supermagnetic separation technology is limited.
In view of the above, it is important to design a wastewater treatment method that can overcome the defect of poor separation effect of the supermagnetic separation device on emulsified oil and dissolved oil micromolecule pollutants, so as to treat oily wastewater and obtain purified water.
Disclosure of Invention
The invention aims to provide a wastewater treatment method, which can overcome the defect of poor separation effect of a super-magnetic separation device on emulsified oil and dissolved oil micromolecular pollutants in the prior art, so that oily wastewater is treated to obtain purified water.
Another objective of the present invention is to provide a wastewater treatment system, which can treat oily wastewater by using a magnetic separation technology, and overcome the defect of poor separation effect of the supermagnetic separation equipment on emulsified oil and dissolved oil micromolecule pollutants in the prior art, so as to treat the oily wastewater to obtain purified water.
The invention is realized by adopting the following technical scheme.
A method of wastewater treatment comprising the steps of:
pumping the wastewater into coagulation equipment for flocculation;
pumping the flocculated wastewater into a super-magnetic separation device for separation;
pumping the separated wastewater into a stirring reactor, and adding super-infiltrated magnetic beads for stirring;
pumping the stirred wastewater into a magnetic separation device for magnetic separation treatment to obtain purified water.
Further, the step of pumping waste water to coagulation equipment for flocculation specifically includes:
pumping the wastewater to a coagulation device;
adding magnetic seeds, a coagulant and a coagulant aid into coagulation equipment;
the wastewater is stirred and flocculated.
Further, the magnetic seeds are magnetite powder; the coagulant is polyaluminium chloride; the coagulant aid is polyacrylamide.
Further, the step of pumping flocculated wastewater into a super-magnetic separation device for separation specifically comprises:
pumping the flocculated wastewater into a super-magnetic separation device;
separating flocs in the wastewater by using a super-magnetic separation device;
and (4) sending the flocs into a magnetic recovery device and an oil stain treatment device in sequence.
Further, the super-infiltrated magnetic beads have chelate-type or hemispherical nanostructures.
Further, the step of pumping the stirred wastewater into a magnetic separation device for magnetic separation treatment and obtaining purified water specifically comprises:
pumping the stirred wastewater into a magnetic separation device for magnetic separation treatment to obtain a magnetic bead mixture and purified water;
the purified water is discharged from the water outlet;
and conveying the magnetic bead mixture to a magnetic bead recovery device.
Further, the step of transporting the magnetic bead mixture to the magnetic bead recycling device specifically includes:
separating super-infiltrated magnetic beads from pollutants by a magnetic bead recovery device;
and putting the separated super-infiltrated magnetic beads into the stirring reactor again.
Further, after the step of pumping the flocculated wastewater into the super-magnetic separation equipment for separation, the method also comprises the following steps:
detecting the pollutant content of the separated wastewater;
when the content of the pollutants is lower than a preset value, directly discharging the separated wastewater;
and when the content of the pollutants is higher than a preset value, pumping the separated wastewater into the stirring separator.
A wastewater treatment system comprising:
the coagulation equipment is used for flocculating the wastewater;
the supermagnetic separation equipment is used for separating the flocculated wastewater;
the stirring reactor is used for adding the super-wetting magnetic beads into the separated wastewater and stirring the wastewater;
and the magnetic separation device is used for carrying out magnetic separation treatment on the stirred wastewater and obtaining purified water.
Further, the device also comprises an infrared rapid oil detector which is used for detecting the pollutant content of the separated wastewater.
The invention has the following beneficial effects:
the invention provides a wastewater treatment method, which comprises the steps of feeding oily wastewater into a coagulation device for flocculation, pumping the flocculated wastewater into a super-magnetic separation device for separation, thereby carrying out primary treatment on the wastewater, pumping the separated wastewater into a stirring reactor, adding super-wetting magnetic beads for stirring, adsorbing small molecular organic matters by using the super-wetting magnetic beads, pumping the stirred wastewater into a magnetic separation device for magnetic separation treatment, separating the super-wetting magnetic beads from water, thereby sucking oil stains out through the super-wetting magnetic beads, and finally obtaining purified water. According to the wastewater treatment method provided by the invention, the primarily treated wastewater can be further adsorbed by the super-wetting magnetic beads, and the defect of poor separation effect of the super-magnetic separation equipment on emulsified oil and dissolved oil micromolecule pollutants in the prior art can be overcome, so that the oily wastewater is treated, and the purified water is obtained.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a block diagram illustrating the steps of a wastewater treatment process according to an embodiment of the present invention;
FIG. 2 is a block diagram of a wastewater treatment system according to an embodiment of the present invention.
Icon: 100-a wastewater treatment system; 110-a coagulation device; 120-a magnetic recovery device; 130-a supermagnetic separation device; 140-oil stain treatment equipment; 150-infrared rapid oil detector; 151-first power valve; 153-a second power valve; 160-a single-chip microcontroller; 170-stirred reactor; 180-magnetic bead recovery device; 190-magnetic separation means.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships conventionally put on the products of the present invention when used, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. Features in the embodiments described below may be combined with each other without conflict.
Referring to fig. 1 and 2 in combination, the present invention provides a wastewater treatment method for treating oily wastewater, comprising the steps of:
s1: the wastewater is pumped into the coagulation apparatus 110 for flocculation.
Specifically, the wastewater is pumped to the coagulation apparatus 110, and the magnetic seeds, the coagulant and the coagulant aid are added to the coagulation apparatus 110 while the wastewater is stirred and flocculated. Under the action of coagulant aid and coagulant, the oil stain in waste water is flocculated on magnetic seed to form oil-containing floc.
In the invention, the magnetic seeds are magnetite powder with the dosage of 20-500 mg/L; the coagulant is polyaluminium chloride, and the dosage is 1-200 mg/L; the coagulant aid is polyacrylamide, and the dosage is 1-200 mg/L. Stirring time is 1-15min, and stirring speed is 10-100 rpm. Wherein, the magnetite powder has magnetism, can form a flocculation core, is beneficial to forming oil-containing floccules, and the coagulant aid play a role in accelerating flocculation.
It is to be noted that polyaluminum chloride, abbreviated as pac (polyaluminum chloride). It is also called water purifying agent or coagulant, and is a water-soluble inorganic high-molecular polymer between aluminium chloride and aluminium hydroxide, and its application range is extensive, and its water-solubility is extensive. Easily and quickly form large alum floc with good precipitation performance.
It should also be noted that polyacrylamide, abbreviated as PAM (Polyacrylamide). The flocculant or the coagulant is a linear high molecular polymer with the molecular weight of between 300 and 2500 ten thousand, and the solid product is white powder in appearance, is colorless viscous colloid in liquid state, is easy to dissolve in water and is almost insoluble in an organic solvent. When in use, the material is dissolved at normal temperature and is easy to decompose when the temperature exceeds 150 ℃. Belongs to non-hazardous articles, and is non-toxic and non-corrosive. The solid PAM has hygroscopicity, flocculation property, adhesiveness, resistance reduction property, thickening property and good stability.
S2: the flocculated wastewater is pumped into a super magnetic separation device 130 for separation.
Specifically, the flocculated wastewater is pumped into a super-magnetic separation device 130, the super-magnetic separation device 130 is used to separate flocs in the wastewater, and the flocs are sequentially sent to a magnetic recovery device 120 and an oil stain treatment device 140. In the actual treatment process, after the wastewater is flocculated, the wastewater is pumped into the super-magnetic separation equipment 130 to separate the oily flocs from the wastewater, the wastewater without the oily flocs enters the next procedure from the water outlet, and the oily flocs enter the magnetic recovery equipment 120 and the oil stain treatment equipment 140 to carry out magnetic seed recovery and oil stain post-treatment.
S3: and detecting the pollutant content of the separated wastewater.
Specifically, the pollutant content, i.e., the oil content, is provided with an infrared rapid oil detector 150 at the water outlet of the ultra-magnetic separation device 130, and the oil content in the wastewater separated from the ultra-magnetic separation device 130 can be measured by the infrared rapid oil detector 150. Specifically, the preset value is 10 mg/L. When the oil content is lower than the preset value, the wastewater after the primary treatment reaches the standard, and the separated wastewater is directly discharged without entering a subsequent treatment method. When the oil content is higher than the preset value, it indicates that the wastewater after the primary treatment does not reach the standard, and the separated wastewater is discharged to the next process, namely to the stirred reactor 170.
S4: the separated wastewater is pumped into a stirring reactor 170, and super-infiltrated magnetic beads are added and stirred.
Specifically, the separated wastewater contains small-molecular organic substances and cannot be removed by flocculation, separation, or the like, and the separated wastewater is sent to the agitation reactor 170, and the super-wet magnetic beads are added to the agitation reactor 170 and agitated.
The super-wetting magnetic beads have chelate or hemispherical nanostructures and can adsorb small molecular organic matters in the oily wastewater. Of course, the super-wetting magnetic beads herein may be a mixture of magnetic beads with chelate-type structures or hemispherical nanostructures. The dosage of the magnetic beads is 1-100mg/L, and the magnetic beads can be put in at one time or slowly put in at the speed of 1-100g/min, the stirring time is 0.5-100min, and the stirring speed is 1-100 rpm.
S5: pumping the stirred wastewater into a magnetic separation device 190 for magnetic separation treatment to obtain purified water.
Specifically, the stirred wastewater is pumped into a magnetic separation device 190 for magnetic separation treatment to obtain a magnetic bead mixture and purified water, wherein the purified water is discharged from a water outlet, and the magnetic bead mixture is conveyed to a magnetic bead recovery device 180.
In the invention, the magnetic field intensity in the magnetic separation device 190 is set to be 0.01-1.5T, the retention time of the wastewater in the magnetic separation device 190 is 5-120s, and the magnetic bead mixture is separated from the water through the magnetic separation device 190, thereby obtaining the purified water. Specifically, the magnetic bead mixture is a mixture in which super-wet magnetic beads are stirred to sufficiently adsorb small molecular organic matters in the wastewater, and the mixture can be separated by a magnetic separation technology, so that the small molecular organic matters in the wastewater are removed, and the purified water is obtained.
In the invention, after the magnetic bead mixture is hung from the magnetic disk by the slag scraping strip in the magnetic separation device 190, the magnetic bead mixture is conveyed to the magnetic bead recovery device 180, the magnetic bead and the oil small molecular pollutants are separated by the magnetic drum, the super-wetting magnetic beads are recovered, and the separated super-wetting magnetic beads are put into the stirring reactor 170 again for reaction, so that the reutilization is realized.
In summary, according to the wastewater treatment method provided by the invention, the super-wetting magnetic beads are used for adsorbing the small molecular organic matters in the wastewater, so that the defect of poor separation effect of the super-magnetic separation technology is overcome, and meanwhile, due to the combination of the magnetic bead separation technology and the super-magnetic separation technology, the usage amount of the coagulant and the coagulant aid can be reduced, the used super-wetting magnetic beads can be recycled without affecting the separation effect, and the wastewater treatment cost can be reduced to a certain extent. In addition, the oil content of the wastewater separated by the supermagnetic separation equipment 130 is measured by adopting the infrared rapid oil detector 150, and the wastewater can be directly discharged after the oil content of the wastewater reaches the standard, so that the method can be realized by steps S1-S3 when the water quality is good, and the resource waste is avoided.
The invention also provides a wastewater treatment system 100, which comprises a coagulation device 110, a supermagnetic separation device 130, a stirring reactor 170, a magnetic separation device 190 and an infrared rapid oil tester 150, wherein the coagulation device 110 is used for flocculating wastewater, and the supermagnetic separation device 130 is used for separating flocculated wastewater; a stirring reactor 170 for adding super-wet magnetic beads to the separated wastewater and stirring; and the magnetic separation device 190 is used for performing magnetic separation treatment on the stirred wastewater and obtaining purified water. And the infrared rapid oil detector 150 is used for detecting the pollutant content of the separated wastewater.
In the invention, the coagulation device 110 is connected with the ultra-magnetic separation device 130 through a pipe pump structure, the ultra-magnetic separation device 130 is connected with the stirring reactor 170 through a pipe pump structure, the stirring reactor 170 is connected with the magnetic separation device 190 through a pipe pump structure, the infrared rapid oil tester 150 is arranged on the pipe pump structure between the ultra-magnetic separation device 130 and the stirring reactor 170, specifically, the infrared rapid oil tester 150 is connected with a water outlet of the ultra-magnetic separation device 130, the infrared rapid oil tester 150 is provided with a first water outlet pipe and a second water outlet pipe, the first water outlet pipe is provided with a first power valve 151 and is directly connected to a purified water outlet, the second water outlet pipe is provided with a second power valve 153 and is connected to the stirring reactor 170, and the first power valve 151 and the second power valve 153 are opened or closed according to a test result of the infrared rapid oil tester 150.
During actual treatment, the oily wastewater is pumped to the coagulation device 110, the coagulation device 110 is added with a magnetic seed, a coagulant aid and a flocculating agent for flocculation, oily floccules are formed in the wastewater after flocculation is finished, the flocculated wastewater is pumped to the super-magnetic separation device 130, the super-magnetic separation device 130 separates the oily floccules in the wastewater by using a super-magnetic separation technology, impurities such as particle pollutants, high molecular organic matters, heavy metal substances and salt ions in the wastewater are preliminarily eliminated, the separated wastewater needs to be subjected to oil content measurement by the infrared rapid oil measurement instrument 150, when the oil content is greater than or equal to 10mg/L, the first power valve 151 is closed, the second power valve 153 is opened, the wastewater is pumped to the stirring reactor 170, and the steps S4 and S5 are performed; when the oil content is less than 10mg/L, the first power valve 151 is opened, the second power valve 153 is closed, the separated wastewater is directly discharged, the wastewater treatment method only carries out the steps S1-S3 and then directly discharges the wastewater, and when the water quality is good, the discharge standard condition is met only by using a super-magnetic separation process, so that the resource waste is avoided.
In the present invention, the ultra-magnetic separation device 130 is further connected to the magnetic recovery device 120, and the separated oil-containing flocs are sent to the magnetic recovery device 120 for magnetic seed recovery. Meanwhile, the magnetic recovery device 120 is connected with the oil stain treatment device 140, and impurities such as oil-containing floccules after the magnetic species recovery are treated by the oil stain treatment device 140 and then enter a discharging or recovery process. The magnetic separation device 190 is further connected with the magnetic bead recovery device 180, the magnetic bead mixture obtained after the magnetic separation processing by the magnetic separation device 190 can be recovered from the super-infiltrated magnetic beads through the magnetic bead recovery device 180, and the recovered super-infiltrated magnetic beads can be put into the stirring reactor 170 again for recycling. The oil separated by the magnetic bead recovery device 180 can be directly sent to the oil treatment equipment 140 for treatment.
In the invention, the infrared rapid oil detector 150 is connected with the single-chip microcontroller 160, the single-chip microcontroller 160 is electrically connected with the first power valve 151 and the second power valve 153, the infrared rapid oil detector 150 detects oil content information and then transmits the oil content information to the single-chip microcontroller 160, and the single-chip microcontroller 160 controls the first power valve 151 and the second power valve 153 to be opened or closed according to the oil content information.
According to the wastewater treatment system 100 provided by the invention, oily wastewater is sent into a coagulation device 110 for flocculation, the flocculated wastewater is pumped into a super-magnetic separation device 130 for separation, so that the wastewater is subjected to primary treatment, the separated wastewater is pumped into a stirring reactor 170 and added with super-wetting magnetic beads for stirring, the super-wetting magnetic beads are used for adsorbing small molecular organic matters, the stirred wastewater is pumped into a magnetic separation device 190 for magnetic separation treatment, the super-wetting magnetic beads are separated from water, so that oil stains are sucked out through the super-wetting magnetic beads, and finally purified water is obtained. According to the wastewater treatment method provided by the invention, the primarily treated wastewater can be further adsorbed by the super-wetting magnetic beads, and the defect of poor separation effect of the super-magnetic separation equipment 130 on emulsified oil and dissolved oil micromolecule pollutants in the prior art can be overcome, so that the oily wastewater is treated, and the purified water is obtained.
The invention is further illustrated by the following examples.
Example 1
The wastewater treated in the embodiment is wastewater generated in the chemical industry, and the oil content of the wastewater is 2700 mg/L.
Pumping the wastewater into a coagulation device 110, respectively adding 200mg/L magnetite powder, 50mg/L PAC and 50mg/L PAM, stirring at 63rpm for 5min, pumping into a super magnetic separation device 130, and separating oil-containing flocs from the wastewater. The oily flocs sequentially enter the magnetic recovery device 120 and the oil stain treatment device 140 for magnetic seed recovery and oil stain post-treatment, and the wastewater without the oily flocs enters the stirring reactor 170 of the magnetic bead separation system from the water outlet. And adding super-wetting magnetic beads with a chelate nano structure into the water at a dose of 10mg/L at one time, stirring the mixture for 2min at the speed of 20rpm, pumping the mixture into a magnetic separation device 190, setting the magnetic field intensity to be 0.05T, and allowing the waste water to stay for 30S to obtain the purified water after magnetic separation treatment.
After magnetic separation treatment, the oil content of the effluent is 43mg/L, and the separation efficiency reaches 98.4%.
Example 2
The wastewater treated in the embodiment is wastewater generated in the chemical industry, and the oil content of the wastewater is 2700 mg/L.
Pumping the wastewater into a coagulation device 110, respectively adding 200mg/L magnetite powder, 100mg/L PAC and 100mg/L PAM, stirring at 63rpm for 5min, pumping into a super magnetic separation device 130, and separating oil-containing flocs from the wastewater. The oily flocs sequentially enter a magnetic recovery device 120 and an oil stain treatment device 140 for magnetic seed recovery and oil stain post-treatment, wastewater without the oily flocs enters a stirring reactor 170 of a magnetic bead separation system from a water outlet, super-wetting magnetic beads are slowly added according to the dosage of 100mg/L, the adding speed is 100g/min, the magnetic beads have chelate type nano structures, the mixture is stirred for 1min at the speed of 30rpm and then pumped into a magnetic separation device 190, the magnetic field intensity is set to be 0.5T, and the retention time of the wastewater is 30S, so that purified water after magnetic separation treatment is obtained.
After magnetic separation treatment, the oil content of the effluent is 5mg/L, and the separation efficiency reaches 99.8 percent.
Example 3
The wastewater treated in the embodiment is the wastewater containing thick oil produced in the petroleum industry, and the oil content of the wastewater is 6500 mg/L.
Pumping the wastewater into a coagulation device 110, respectively adding 300mg/L magnetite powder, 200mg/L PAC and 200mg/L PAM, stirring at 63rpm for 5min, pumping into a super magnetic separation device 130, and separating oil-containing flocs from the wastewater. The oily flocs sequentially enter a magnetic recovery device 120 and an oily soil treatment device 140 for magnetic seed recovery and oily soil post-treatment, wastewater without the oily flocs enters a stirring reactor 170 of a magnetic bead separation system from a water outlet, super-wetting magnetic beads are slowly added according to the dosage of 20mg/L at the adding speed of 10g/min, the magnetic beads have a hemispherical nano structure, the mixture is stirred at the speed of 20rpm for 2min and then pumped into a magnetic separation device 190, the magnetic field intensity is set to be 0.05T, and the retention time of the wastewater is 30S, so that purified water after separation treatment is obtained.
After separation treatment, the oil content of the effluent is 81mg/L, and the separation efficiency reaches 98.8 percent.
Example 4
The wastewater treated in the embodiment is the wastewater containing thick oil produced in the petroleum industry, and the oil content of the wastewater is 6500 mg/L.
Pumping the wastewater into a coagulation device 110, respectively adding 300mg/L magnetite powder, 200mg/L PAC and 200mg/L PAM, stirring at 63rpm for 5min, pumping into a super magnetic separation device 130, and separating oil-containing flocs from the wastewater. The oily flocs sequentially enter a magnetic recovery device 120 and an oil stain treatment device 140 for magnetic seed recovery and oil stain post-treatment, wastewater without the oily flocs enters a stirring reactor 170 of a magnetic bead separation system from a water outlet, super-wetting magnetic beads are slowly added according to the dosage of 100mg/L, the adding speed is 100g/min, the magnetic beads have chelate type nano structures, the mixture is stirred for 1min at the speed of 30rpm and then pumped into a magnetic separation device 190, the magnetic field intensity is set to be 0.5T, and the retention time of the wastewater is 30S, so that purified water after magnetic separation treatment is obtained.
After magnetic separation treatment, the oil content of the effluent is 10mg/L, and the separation efficiency reaches 99.8 percent.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of wastewater treatment, comprising the steps of:
pumping the wastewater into coagulation equipment for flocculation;
pumping the flocculated wastewater into a super-magnetic separation device for separation;
pumping the separated wastewater into a stirring reactor, and adding super-infiltrated magnetic beads for stirring;
pumping the stirred wastewater into a magnetic separation device for magnetic separation treatment to obtain purified water.
2. The wastewater treatment method according to claim 1, wherein the step of pumping the wastewater into a coagulation device for flocculation comprises:
pumping the wastewater to the coagulation device;
adding magnetic seeds, a coagulant and a coagulant aid into the coagulation equipment;
the wastewater is stirred and flocculated.
3. The wastewater treatment method according to claim 2, wherein the magnetic seeds are magnetite powder; the coagulant is polyaluminium chloride; the coagulant aid is polyacrylamide.
4. The wastewater treatment method according to claim 1, wherein the step of pumping the flocculated wastewater into a super-magnetic separation device for separation comprises:
pumping the flocculated wastewater into the super-magnetic separation equipment;
separating flocs in the wastewater by using the super-magnetic separation equipment;
and sequentially feeding the flocs into a magnetic recovery device and an oil stain treatment device.
5. The method of claim 1, wherein the super-wetting magnetic beads have chelate-type or hemispherical nanostructures.
6. The wastewater treatment method according to claim 1, wherein the step of pumping the stirred wastewater into a magnetic separation device for magnetic separation treatment to obtain purified water comprises:
pumping the stirred wastewater into the magnetic separation device for magnetic separation treatment to obtain a magnetic bead mixture and purified water;
the purified water is discharged from the water outlet;
and conveying the magnetic bead mixture to a magnetic bead recovery device.
7. The wastewater treatment method according to claim 6, wherein the step of delivering the magnetic bead mixture to a magnetic bead recovery device specifically comprises:
the magnetic bead recovery device is used for separating super-infiltrated magnetic beads from pollutants;
and putting the separated super-infiltrating magnetic beads into the stirring reactor again.
8. The wastewater treatment method according to claim 1, further comprising the following steps after the step of pumping the flocculated wastewater into the super magnetic separation device for separation:
detecting the pollutant content of the separated wastewater;
when the content of the pollutants is lower than a preset value, discharging the separated wastewater;
and when the content of the pollutants is higher than a preset value, pumping the separated wastewater into the stirring separator.
9. A wastewater treatment system, comprising:
the coagulation equipment is used for flocculating the wastewater;
the supermagnetic separation equipment is used for separating the flocculated wastewater;
the stirring reactor is used for adding the super-wetting magnetic beads into the separated wastewater and stirring the wastewater;
and the magnetic separation device is used for carrying out magnetic separation treatment on the stirred wastewater and obtaining purified water.
10. The wastewater treatment system of claim 9, further comprising an infrared rapid oil meter for detecting a contaminant content of the separated wastewater.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20110168639A1 (en) * | 2010-01-12 | 2011-07-14 | Hitachi Plant Technologies, Ltd. | Wastewater treatment method and wastewater treatment apparatus |
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