CN112978876B - Electrochemical sterilization treatment device and method for volume fracturing waste liquid - Google Patents
Electrochemical sterilization treatment device and method for volume fracturing waste liquid Download PDFInfo
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- CN112978876B CN112978876B CN201911299392.5A CN201911299392A CN112978876B CN 112978876 B CN112978876 B CN 112978876B CN 201911299392 A CN201911299392 A CN 201911299392A CN 112978876 B CN112978876 B CN 112978876B
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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
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
Abstract
The invention provides a device and a method for electrochemically sterilizing volume fracturing waste liquid, wherein the device comprises: an electromagnetic sterilization reactor and a direct-current variable-frequency pulse power supply; the direct-current variable-frequency pulse power supply is electrically connected with the electromagnetic sterilization reactor and is used for supplying power to the electromagnetic sterilization reactor; the electromagnetic sterilization reactor is made of a galvanized iron pipe and comprises a liquid inlet and a liquid outlet; the outer wall of the electromagnetic sterilization reactor is wound with a plurality of circles of insulated wires to generate an induction electric field. The method provided by the invention utilizes the device for electrochemically sterilizing the volume fracturing waste liquid. The invention utilizes the electromagnetic water treatment sterilization technology to realize the synchronous action of electrochemical sterilization and oxidation sterilization under the action of an electric field, and can obviously reduce the usage amount and the treatment cost of chemical bactericide in the recycling treatment process of the volume fracturing waste liquid.
Description
Technical Field
The invention relates to a device and a method for electrochemically sterilizing volume fracturing waste liquid, and belongs to the technical field of industrial wastewater treatment.
Background
The volume fracturing construction in the shale gas development process becomes a main means for increasing the yield of shale gas, and along with the development mode of a 'well factory', the water resource consumption in the volume fracturing process is continuously increased, so that great pressure is caused to regional water resource supply; meanwhile, a large amount of flowback fluid generated in the volume fracturing process has the characteristics of high suspended matter, high stability and the like, and if the flowback fluid is not discharged outside, the peripheral environment is seriously polluted, so at present, production enterprises mostly carry out flowback fluid recycling treatment on the spot, the water resource in the area is recycled, the pressure on the peripheral environment is reduced, and the shale gas exploitation cost is effectively controlled.
By combining with a fracturing waste liquid recycling way, the conventional treatment technology of shale gas volume fracturing waste liquid mainly comprises the following steps: chemical flocculation, chemical oxidation, micro-electrolysis, electric flocculation and other treatment technologies. A slick water flowback fluid recycling technology for sand fracturing is formed in part of shale gas production enterprises and is applied to the field, and the basic treatment and recycling process comprises the following steps: physical separation → stability adjustment → water quality adjustment → clear water is mixed and diluted to be used as fracturing water. The treatment mode is relatively simple, but the destabilization separation process has poor adaptability to water quality, and part of return fluid with complex components needs to be diluted with clear water to meet the requirement of fracturing water.
Along with the gradual deepening of the recycling work of the volume fracturing waste liquid, the influence of microorganisms in the waste liquid draws extensive attention. Due to the increase of the recycling times and the increase of the temporary storage time of the fracturing waste liquid, the problems of blackening and smelling of the liquid in the temporary storage tank of the waste liquid, reduction of the quality of recycled liquid preparation, corrosion of recycled treatment equipment and the like appear in part of areas. The phenomenon is closely related to microorganisms such as sulfate reducing bacteria, saprophytic bacteria and the like in the fracturing waste liquid through analysis. In order to reduce the adverse effect of microorganisms, part of enterprises adopt a mode of adding bactericide into waste liquid to control the content of the microorganisms, and certain effect is achieved. However, the bactericide which takes sodium hypochlorite as a main component has strong corrosivity on the one hand, has certain influence on operators and operation environment, and residual chlorine can also cause corrosion of subsequent treatment equipment.
Therefore, the optimal sterilization technology is used for controlling the content of microorganisms in the volume fracturing waste liquid, the sterilization treatment cost is effectively reduced, and the key problem of realizing the efficient recycling of water resources in the shale gas development volume fracturing process is solved.
Disclosure of Invention
In order to solve the above disadvantages and shortcomings, an object of the present invention is to provide an electrochemical sterilization treatment device for volume fracture waste liquid.
The invention also aims to provide an electrochemical sterilization treatment method for the volume fracturing waste liquid. The invention utilizes the electromagnetic water treatment sterilization technology to realize the synchronous action of electrochemical sterilization and oxidation sterilization under the action of an electric field, and can obviously reduce the usage amount and the treatment cost of chemical bactericide in the recycling treatment process of the volume fracturing waste liquid.
In order to achieve the above object, in one aspect, the present invention provides a volumetric fracturing waste liquid electrochemical sterilization treatment device, wherein the volumetric fracturing waste liquid electrochemical sterilization treatment device comprises: an electromagnetic sterilization reactor and a direct-current variable-frequency pulse power supply; the direct-current variable-frequency pulse power supply is electrically connected with the electromagnetic sterilization reactor and is used for supplying power to the electromagnetic sterilization reactor;
the electromagnetic sterilization reactor is made of an iron pipe with zinc plated inside and outside, and comprises a liquid inlet and a liquid outlet;
the outer wall of the electromagnetic sterilization reactor is wound with a plurality of circles of insulated wires to generate an induction electric field.
In the above-described apparatus, preferably, the dc type variable frequency pulse power supply is a dc type variable frequency pulse power supply controlled by a microcomputer.
In the above apparatus, preferably, the insulating wire is wound around the outer wall of the electromagnetic sterilization reactor in a flat winding manner.
In the above-described device, preferably, the number of turns of the insulated wire is 20 to 60 turns.
In the above-described device, preferably, the number of turns of the insulated wire is 40.
In the above-described device, preferably, the insulated wires are 4-7 core wires each having a cross-sectional area of 0.03-0.08cm 2 。
In the above-described device, preferably, the insulated wires are 5-core wires each having a cross-sectional area of 0.06cm 2 。
In the above device, preferably, the cathode end of the insulated wire is provided with a movable line clamp for flexibly adjusting the number of turns of the insulated wire.
The cathode end of the insulated wire is provided with the movable wire clamp, so that the number of turns of the insulated wire can be flexibly adjusted by adjusting the position of the wire clamp according to the specific condition of water inflow in the electromagnetic sterilization process, the electric field intensity and the effective retention time can be applied, and the sterilization efficiency of unit energy consumption is improved.
The invention utilizes the electromagnetic sterilization reactor which can flexibly adjust the number of the coils, and can conveniently adjust the electric field intensity and the effective retention time according to the water quality condition of the incoming water, thereby reasonably controlling the energy consumption and reducing the processing cost on the premise of ensuring the sterilization efficiency, and compared with the conventional sterilization technology, the power consumption of the electrochemical sterilization technology is reduced by 15-20 percent.
Preferably, the device further comprises a chemical sterilization processing unit, and an inlet of the chemical sterilization processing unit is connected with a liquid outlet of the electromagnetic sterilization reactor through a pipeline.
The volume fracturing waste liquid electrochemical sterilization treatment device provided by the invention adopts an optimized direct-current pulse variable-frequency electric field to act on an electromagnetic sterilization reactor, utilizes direct-current pulse current to generate recoil high voltage to realize quick killing of microorganisms, and simultaneously utilizes oxidizing substances generated by a water body (volume fracturing waste liquid) under the action of the direct-current pulse electric field to destroy the normal physiological functions of the microorganisms, thereby achieving the effect of killing the microorganisms. The device utilizes the electromagnetic sterilization reactor with optimized design, has better electric field transmission and battery formation characteristics, generates instant recoil high voltage in the reaction process, and improves the transmission efficiency of electromagnetic field energy; the optimization of the sweep frequency range and the sweep frequency period of the electromagnetic sterilization reactor can fully exert the acting force of the alternating electric field on two sides of the cell membrane, thereby inhibiting the activity of cells and efficiently killing bacteria.
In another aspect, the present invention further provides a method for electrochemically sterilizing a volume of fracturing waste liquid, where the method uses the above apparatus for electrochemically sterilizing a volume of fracturing waste liquid, and the method includes:
and (3) allowing the volume fracturing waste liquid to enter an electromagnetic sterilization reactor for electromagnetic sterilization, wherein in the electromagnetic sterilization process, the frequency sweeping process of the direct-current variable-frequency pulse power supply is set to be changed from low frequency to high frequency in a reciprocating mode.
In the method, a direct-current variable-frequency pulse power supply controlled by a microcomputer is used as a power supply of the electromagnetic sterilization reactor, and the frequency sweeping process, the frequency interval, the scanning period, the carrier frequency, the waveform and the like of the direct-current variable-frequency pulse power supply can be adjusted in real time according to the treatment requirement and the water quality parameters of the volume of the fracturing waste liquid to be treated, so that the optimal adjustment of a recoil electric field is realized, and the sterilization efficiency is improved; preferably, in the electromagnetic sterilization process, the frequency sweeping process of the direct-current variable-frequency pulse power supply is set to change from low frequency to high frequency in a reciprocating mode, the frequency interval is 20Hz-65HZ, the scanning period is 1.0-1.8s, and the carrier frequency is 1MHz.
In the above-described method, the sterilization efficiency can be enhanced by selecting the optimum operation parameters suitable for different water qualities by optimizing the electric field frequency. The electric field scanning period is controlled by a microcomputer, and the scanning period and the waveform can be randomly changed within a certain range, so that the problem of reduction of sterilization efficiency caused by periodic change of frequency is avoided.
In the method described above, preferably, the frequency interval is 45HZ, and the scanning period is 1.2s.
In the above-described method, it is preferable that the waveform of the dc type variable frequency pulse power supply used is switched among a plurality of waveforms including a rectangular wave, a spike wave, a sawtooth wave, and a step wave.
In the method, preferably, in the electromagnetic sterilization process, a step wave stepping electric field is adopted, and the variation time of the electric field intensity is 100-400ms.
The pulse waveform adopts a step-by-step design, can realize good coupling with a randomly changed scanning period, and simultaneously can increase the irregularity of induced recoil voltage by the step-by-step waveform, thereby improving the conversion efficiency of electromagnetic field energy and improving various physical, chemical and biological effects of the electromagnetic field, and the waveform can reduce the power consumption by 8-17 percent under the condition of the same microorganism killing rate.
In the above method, preferably, the flow rate of the volume of the fracturing waste liquid in the electromagnetic sterilization reactor is 0.4-0.7m/s. Under the flow velocity, the Lorentz force generated by the electric field of the volume fracturing waste liquid can be effectively coupled with the induced current generated by the excitation of the pulse electric field to destroy cell membranes or denature proteins and enzymes, so that the physiological function of the volume fracturing waste liquid is destroyed, and the sterilization efficiency is improved.
In the method, the electromagnetic sterilization reactor made of the galvanized iron pipe and the conventional insulated wire can reasonably design the pipe diameter, the pipe length and the flow velocity according to the treatment capacity requirement and the retention time requirement, ensure the sufficient action time of the water body under the condition of an electric field, realize the superposition with the action of the electric field by utilizing the Lorentz force generated when the water body flows through the electromagnetic field, and improve the sterilization efficiency by about 10 percent under the selected optimal flow velocity condition.
In the method described above, preferably, the flow rate of the volume of the fracturing waste liquid in the electromagnetic sterilization reactor is 0.5m/s.
Preferably, the method further comprises the step of subjecting the electromagnetically sterilized volume of fracturing waste liquid to chemical sterilization treatment.
And the volume fracturing waste liquid after the electromagnetic sterilization reactor is subjected to sterilization treatment enters a chemical sterilization treatment unit, wherein a small amount of chemical bactericide is added into the chemical sterilization treatment unit according to the water quality condition so as to realize the on-way slow-release sterilization effect and ensure the microbial control in the recycling process of the volume fracturing waste liquid.
In the electrochemical sterilization treatment device for the volume fracturing waste liquid, the electromagnetic sterilization reactor is manufactured by adopting a galvanized iron pipe and a conventional insulated wire, and the quantity of coils, the intensity of applied electric field and the effective retention time can be flexibly adjusted according to the change condition of the water quality of the incoming water, so that the treatment cost is effectively controlled;
the electromagnetic sterilization reactor is provided with a direct-current variable-frequency pulse power supply controlled by a microcomputer, and a back-flushing high voltage can be formed in the electromagnetic sterilization reactor so as to realize the function of efficiently killing microorganisms;
the electromagnetic sterilization reactor is provided with a direct-current variable-frequency pulse power supply controlled by a microcomputer, and the effects of an alternating electric field on inhibiting cell activity and efficiently killing bacteria can be fully exerted through the optimized design of a frequency sweep frequency interval, a scanning period, a carrier frequency and a pulse waveform, so that the energy consumption in the sterilization process is reduced;
through reasonable design of the pipe diameter, the length and the fluid flow rate of the reactor, effective coupling with Lorentz force can be realized while static sterilization of a pulse electric field is realized, and energy consumption and comprehensive cost in the process are further reduced while the sterilization effect is enhanced; compared with the conventional electrochemical sterilization technology, the optimally designed electromagnetic sterilization reactor has obvious advantages in the aspects of shortening the reaction time, reducing the comprehensive cost and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a volume fracturing waste liquid electrochemical sterilization processing apparatus provided in embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a volume fracturing waste liquid electrochemical sterilization treatment device provided in embodiment 2 of the present invention.
The main reference numbers illustrate:
1. an electromagnetic sterilization reactor;
2. a direct current type variable frequency pulse power supply;
3. a chemical sterilization processing unit.
Detailed Description
The technical solutions of the present invention will be described in detail with reference to the following specific examples in order to clearly understand the technical features, objects and advantages of the present invention, but the present invention should not be construed as being limited to the implementable scope of the present invention.
Example 1
The embodiment provides a volume fracturing waste liquid electrochemical sterilization treatment device, the structural schematic diagram of which is shown in fig. 1, and as can be seen from fig. 1, the device comprises: an electromagnetic sterilization reactor 1 and a direct-current variable-frequency pulse power supply 2; the direct-current variable-frequency pulse power supply 2 is electrically connected with the electromagnetic sterilization reactor 1 and is used for supplying power to the electromagnetic sterilization reactor;
the electromagnetic sterilization reactor 1 is made of an iron pipe with zinc plated inside and outside, and comprises a liquid inlet and a liquid outlet;
a plurality of circles of insulated wires are wound on the outer wall of the electromagnetic sterilization reactor 1 to generate an induction electric field;
in this embodiment, the dc type variable frequency pulse power supply 2 is a dc type variable frequency pulse power supply controlled by a microcomputer, and the power supply is a conventional device;
in this embodiment, the winding manner of the plurality of turns of the insulated wire on the outer wall of the electromagnetic sterilization reactor is flat winding, and the number of turns of the insulated wire is 40;
in this embodiment, the insulated wires are 5-core wires, and each wire has a cross-sectional area of 0.06cm 2 ；
In this embodiment, the cathode end of the insulated wire is provided with a movable line clamp for flexibly adjusting the number of turns of the insulated wire.
Example 2
The embodiment provides a volume fracturing waste liquid electrochemical sterilization treatment device, the structural schematic diagram of which is shown in fig. 2, and as can be seen from fig. 2, the device comprises: the device comprises an electromagnetic sterilization reactor 1, a direct-current variable-frequency pulse power supply 2 and a chemical sterilization processing unit 3; the direct-current variable-frequency pulse power supply 2 is electrically connected with the electromagnetic sterilization reactor 1 and is used for supplying power to the electromagnetic sterilization reactor; an inlet of the chemical sterilization processing unit 3 is connected with a liquid outlet of the electromagnetic sterilization reactor 1 through a pipeline;
the electromagnetic sterilization reactor 1 is made of a galvanized iron pipe and comprises a liquid inlet and a liquid outlet;
a plurality of circles of insulated wires are wound on the outer wall of the electromagnetic sterilization reactor 1 to generate an induction electric field;
in this embodiment, the dc type variable frequency pulse power supply 2 is a dc type variable frequency pulse power supply controlled by a microcomputer, and the power supply is a conventional device;
in this embodiment, the winding manner of the plurality of turns of the insulated wire on the outer wall of the electromagnetic sterilization reactor is flat winding, and the number of turns of the insulated wire is 40;
in this embodiment, the insulated wires are 5-core wires, and each wire has a cross-sectional area of 0.06cm 2 ；
In this embodiment, the cathode end of the insulated wire is provided with a movable line clamp for flexibly adjusting the number of turns of the insulated wire.
Example 3
The embodiment provides an electrochemical sterilization treatment method for volume fracturing waste liquid, wherein the method utilizes the electrochemical sterilization treatment device for volume fracturing waste liquid provided in embodiment 1, and the method comprises the following specific steps:
the volume fracturing waste liquid enters an electromagnetic sterilization reactor for electromagnetic sterilization, wherein in the electromagnetic sterilization process, the frequency sweeping process of a direct-current variable-frequency pulse power supply is set to change from low frequency to high frequency in a reciprocating manner, the frequency interval is 45HZ, the scanning period is 1.2s, and the carrier frequency is 1MHz;
in the electromagnetic sterilization process, a step wave stepping electric field is adopted, and the variation time of the electric field intensity is 100-400ms;
in the electromagnetic sterilization reactor, the flow velocity of the volume fracturing waste liquid is 0.5m/s;
in this embodiment, the volume of the fracturing waste liquid is the volume of the fracturing waste liquid of a certain oil and gas development enterprise, and the treatment scale is 1.50m 3 Per hour, sulfate Reducing Bacteria (SRB) in the waste liquid is 2.8-4.1 × 10 4 The number of saprophytic bacteria (TGB) per mg is 1.0-1.7 × 10 6 The number of iron bacteria (FB) per mg is 6.8-7.5 × 10 2 Per mg;
under the condition of not adding treatment agents, after the treatment method in the embodiment 3 is adopted to carry out electrochemical sterilization treatment on the volume fracturing waste liquid, the COD of the effluent of the device is 50-80mg/L, and the Sulfate Reducing Bacteria (SRB) is 0.45-0.9 multiplied by 10 4 The number of saprophytic bacteria (TGB) is 0.2-0.4 × 10 6 The number of iron bacteria (FB) per mg is 1.6-1.5 × 10 2 The microbial killing rate per mg is more than 75 percent after the method is used for treating the volume fracturing waste liquid which is not treated.
It should be understood that the above description is only exemplary of the invention, and is not intended to limit the scope of the invention, so that the replacement of equivalent elements or equivalent changes and modifications made in the present invention should be included within the scope of the present invention. In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.
Claims (14)
1. The volume fracturing waste liquid electrochemical sterilization treatment device is characterized by comprising: an electromagnetic sterilization reactor and a direct-current variable-frequency pulse power supply; the direct-current variable-frequency pulse power supply is electrically connected with the electromagnetic sterilization reactor and is used for supplying power to the electromagnetic sterilization reactor; the waveform of the direct-current variable-frequency pulse power supply is switched among various waveforms including rectangular waves, sharp pulse waves, sawtooth waves and step waves;
the electromagnetic sterilization reactor is made of an iron pipe with zinc plated inside and outside, and comprises a liquid inlet and a liquid outlet;
a plurality of circles of insulated wires are wound on the outer wall of the electromagnetic sterilization reactor to generate an induction electric field;
and the cathode end of the insulated wire is provided with a movable line card for flexibly adjusting the number of turns of the insulated wire.
2. The apparatus according to claim 1, wherein the dc type variable frequency pulse power source is a dc type variable frequency pulse power source controlled by a microcomputer.
3. The apparatus of claim 1, wherein the plurality of turns of the insulated conductive wire are wound around the outer wall of the electromagnetic germicidal reactor in a flat manner.
4. The apparatus of claim 1, wherein the number of turns of the insulated conductor is 20-60 turns.
5. The apparatus of claim 4, wherein the number of turns of the insulated conductor is 40.
6. The device of any one of claims 1,4-5, wherein the insulated conductors are 4-7 core conductors, each conductor having a cross-sectional area of 0.03-0.08cm 2 。
7. The apparatus of claim 6, wherein the insulated conductors are 5-core conductors each having a cross-sectional area of 0.06cm 2 。
8. The apparatus of claim 1, further comprising a chemical sterilization treatment unit, wherein an inlet of the chemical sterilization treatment unit is connected with the liquid outlet of the electromagnetic sterilization reactor through a pipeline.
9. A method for electrochemically sterilizing a volume of fracturing waste liquid, which comprises the steps of using the apparatus for electrochemically sterilizing a volume of fracturing waste liquid according to any one of claims 1 to 8, and comprises:
and (3) allowing the volume fracturing waste liquid to enter an electromagnetic sterilization reactor for electromagnetic sterilization, wherein in the electromagnetic sterilization process, the frequency sweeping process of the direct-current variable-frequency pulse power supply is set to be changed from low frequency to high frequency in a reciprocating mode.
10. The method according to claim 9, wherein in the electromagnetic sterilization process, the frequency sweep process of the direct current type variable frequency pulse power source is set to change from low frequency to high frequency, the frequency interval is 20Hz-65Hz, the scanning period is 1.0-1.8s, and the carrier frequency is 1MHz.
11. The method of claim 9, wherein the electromagnetic sterilization process uses a step wave stepping electric field, and the variation time of the electric field intensity is 100-400ms.
12. The method as claimed in claim 9, wherein the flow rate of the volume of the fracturing waste liquid in the electromagnetic germicidal reactor is 0.4-0.7m/s.
13. The method of claim 12, wherein the flow rate of the volume of the fracturing waste fluid in the electromagnetic germicidal reactor is 0.5m/s.
14. The method of claim 9, further comprising chemically sterilizing the electromagnetically sterilized volume of fracturing waste fluid.
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