CN113121070A - Microwave liquid phase discharge-biological aerated filter coupling device and use method - Google Patents
Microwave liquid phase discharge-biological aerated filter coupling device and use method Download PDFInfo
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- 238000010168 coupling process Methods 0.000 title claims abstract description 36
- 230000008878 coupling Effects 0.000 title claims abstract description 19
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 16
- 208000028659 discharge Diseases 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000012530 fluid Substances 0.000 claims abstract description 30
- 238000005273 aeration Methods 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000002351 wastewater Substances 0.000 claims abstract description 15
- 239000010453 quartz Substances 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 12
- 230000005284 excitation Effects 0.000 claims abstract description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 229910052631 glauconite Inorganic materials 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 4
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- 238000002347 injection Methods 0.000 claims description 3
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- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
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- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/302—Treatment of water, waste water, or sewage by irradiation with microwaves
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/105—Characterized by the chemical composition
- C02F3/107—Inorganic materials, e.g. sand, silicates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/341—Consortia of bacteria
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
Abstract
The invention discloses a microwave liquid phase discharge-biological aerated filter coupling device and a using method thereof, belonging to the technical field of oilfield fracturing flowback fluid treatment. The top of the reactor of the coupling device is provided with a water inlet, the bottom of the reactor is provided with a liquid discharge port, the upper part of the reactor is a microwave liquid phase discharge treatment unit, and the lower part of the reactor is an aeration biological filter treatment unit: the plasma excitation device of the microwave liquid-phase discharge processing unit comprises a waveguide tube and quartz, wherein one end of the waveguide tube is connected with a microwave generator, the other end of the waveguide tube is arranged on the side wall of the reactor of the microwave liquid-phase discharge processing unit part of the reactor, the quartz is arranged in the waveguide tube, and a plurality of grooves are arranged on the outer surface of the quartz; the biological aerated filter treatment unit is sequentially provided with an aeration device, a bearing plate and a filter material from bottom to top. The invention adopts the microwave liquid phase discharge-biological aerated filter coupling process to treat the oil field degradation-resistant wastewater, and can ensure lower operation cost while improving the treatment efficiency.
Description
Technical Field
The invention relates to the technical field of oil field fracturing flowback fluid treatment, in particular to a microwave liquid phase discharge-biological aerated filter coupling device and a using method thereof.
Background
At present, the oil deposit exploration reserves in China have a low/ultra-low permeability oil field accounting for 60 percent, and the exploitation of the low/ultra-low permeability oil field has certain significance for relieving energy shortage. However, the low-permeability oil field has the characteristics of low abundance, low pressure and low yield, the exploitation difficulty is high, and the oil field fracturing operation becomes an effective way for increasing the yield of the oil field. The fracturing operation with high complexity is adopted on a large scale, so that the discharge amount of the fracturing flowback fluid is continuously increased. The fracturing flow-back fluid has complex components, mainly comprises guanidine gum, formaldehyde, petroleum and benzene series, and can have great influence on the ecological environment around an oil field if the fracturing flow-back fluid is not properly treated.
With the large-scale popularization of fracturing operation, more and more fracturing flow-back fluid needs to be treated, and the external drainage and reuse treatment modes need to reach higher water quality treatment standards. However, the fracturing flow-back fluid has complex components and stable chemical properties, the existing treatment process is complex, the treatment cost is high, the treatment effect is poor, and a mature complete process is still lacked for treating the fracturing flow-back fluid. Therefore, the development of the treatment process with high efficiency and low energy consumption has very important significance for oil and gas development.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a microwave liquid phase discharge-biological aerated filter coupling device and a using method thereof.
The invention aims to provide a microwave liquid phase discharge-biological aerated filter coupling device, which comprises a reactor, wherein the top of the reactor is provided with a water inlet, the bottom of the reactor is provided with a liquid outlet, the upper part of the reactor is a microwave liquid phase discharge treatment unit, and the lower part of the reactor is a biological aerated filter treatment unit:
the microwave liquid phase discharge processing unit comprises a microwave generator and a plasma excitation device, wherein the plasma excitation device comprises a waveguide tube and quartz, one end of the waveguide tube is connected with the microwave generator, the other end of the waveguide tube is arranged on the side wall of the reactor corresponding to the microwave liquid phase discharge processing unit of the reactor, the quartz is arranged in the waveguide tube, and a plurality of grooves are formed in the outer surface of the quartz;
the aeration biological filter treatment unit is sequentially provided with an aeration device, a bearing plate and a filter material from bottom to top, the aeration device is connected with an oxygen supply device, and the bearing plate is provided with an aperture which is smaller than the diameter of the filter material.
Preferably, the waveguide is a rectangular waveguide.
Preferably, the water inlet is connected with a buffer water tank.
Preferably, the filter material is a glauconite filter material.
Preferably, the bottom of the reactor is also provided with a back-washing water inlet, the side wall of the reactor above the filter material is provided with a back-washing water outlet, and the liquid outlet and the back-washing water inlet are both positioned below the aeration device.
The bottom of the reactor is also provided with a slag discharge port.
The invention also aims to provide a use method of the microwave liquid phase discharge-biological aerated filter coupling device, which comprises the following steps:
s101, injecting the oilfield fracturing flow-back fluid into a reactor through a water inlet of the reactor, wherein the injection flow rate of the oilfield fracturing flow-back fluid is controlled to be 9 x 10-7m3/s；
S102, turning on a control power supply of a microwave generator and an aeration device, adjusting the input power of the microwave generator, and adjusting the aeration device to enable the dissolved oxygen at the top of the reactor to be 3-4 mg/L;
s103, treating the oilfield fracturing flow-back fluid by a microwave liquid-phase discharge treatment unit, allowing the wastewater to flow downwards under the action of gravity, and treating the wastewater again by a filter material and an aeration device;
s104, discharging the treated wastewater to the outside of the reactor through a liquid outlet.
Compared with the prior art, the invention has the beneficial effects that: the coupling device of the invention utilizes microwave to discharge in the oil field fracturing flow-back fluid to generate plasma, high-energy electrons (5-20eV) in the plasma can break bonds of organic macromolecules in the sewage and initiate subsequent chain reaction, a large amount of molecular fragments are generated in the process, wherein the molecular fragments comprise OH and O with high oxidation potentials, the oxidation potentials are respectively 2.8V and 2.42V, and the active particles can further attack surrounding macromolecular organic matters to oxidize and decompose the macromolecular organic matters. The minimum requirement of biodegradability is achieved by reasonably controlling the plasma treatment time, and the aims of quick, efficient and energy-saving pretreatment are fulfilled.
The invention adopts a microwave liquid phase discharge-biological aerated filter coupling process to treat the fracturing flow-back fluid of the oil field. After microwave discharge treatment, macromolecular substances in the oilfield fracturing flow-back fluid are effectively degraded, COD (chemical oxygen demand) of the wastewater is remarkably reduced, and the biodegradability of the wastewater is improved. Therefore, the oil field fracturing fluid after microwave liquid phase discharge treatment is suitable for subsequent treatment by adopting a biological process. After the treated fracturing flow-back fluid is subjected to strengthening treatment by the biological aerated filter treatment unit, the water quality is good, and the oil field reinjection water standard can be met.
In the invention, the refractory wastewater in the oil field is treated by adopting a microwave liquid-phase discharge-biological aerated filter coupling process, so that the treatment efficiency is improved, and the lower operation cost can be ensured. Has higher implementation and popularization values.
Drawings
FIG. 1 is a schematic structural diagram of the present embodiment;
FIG. 2 is a schematic view of the internal structure of the plasma excitation device according to the present embodiment;
FIG. 3 is a graph showing the effect of the coupling process on COD degradation in this example;
FIG. 4 is a graph showing the degradation efficiency of the coupling process for oil content in the present example;
FIG. 5 is a graph showing the degradation efficiency of the coupling process for suspended matter in the present example;
FIG. 6 is a graph showing the degradation efficiency of ammonia nitrogen by the coupling process of this example;
FIG. 7 shows the removal rate of each index in the coupling process of this embodiment; .
Description of reference numerals:
1. the device comprises a reactor, a water inlet, a liquid outlet, a microwave generator, a plasma excitation device, a waveguide tube, a quartz tube, an aeration device, a supporting plate, a filter material, a groove, a buffer water tank, a back flush water inlet, a back flush water outlet, a slag discharge port and a plasma, wherein the reactor comprises 2 parts of a water inlet, 3 parts of a liquid outlet, 4 parts of a microwave generator, 5 parts of a plasma excitation device, 6 parts of a waveguide tube, 7 parts of quartz, 8 parts of an aeration device, 9 parts of a.
Detailed Description
Detailed description of the preferred embodimentsthe following detailed description of the present invention will be made with reference to the accompanying drawings 1-2, although it should be understood that the scope of the present invention is not limited to the specific embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
The invention provides a microwave liquid phase discharge-biological aerated filter coupling device and a using method thereof, the device comprises a reactor 1, the top of the reactor 1 is provided with a water inlet 2, the bottom of the reactor 1 is provided with a liquid discharge port 3, the upper part of the reactor 1 is a microwave liquid phase discharge processing unit, and the lower part is a biological aerated filter processing unit:
the microwave liquid phase discharge processing unit comprises a microwave generator 4 and a plasma excitation device 5, wherein the plasma excitation device 5 comprises a waveguide tube 6 and quartz 7, one end of the waveguide tube 6 is connected with the microwave generator 4, the other end of the waveguide tube 6 is arranged on the side wall of the reactor 1 corresponding to the microwave liquid phase discharge processing unit of the reactor 1, the quartz 7 is arranged in the waveguide tube 6, and a plurality of grooves 11 are formed in the outer surface of the quartz 7;
the biological aerated filter treatment unit is sequentially provided with an aeration device 8, a bearing plate 9 and a filter material 10 from bottom to top, wherein the aeration device 8 is connected with an oxygen supply device, and the bearing plate 9 is provided with an aperture which is smaller than the diameter of the filter material 10.
Wherein the waveguide 6 is a rectangular waveguide.
Wherein the water inlet 2 is connected with a buffer water tank 12.
Wherein, the filter material 10 is a glauconite filter material.
Wherein, the bottom of the reactor 1 is also provided with a back flush water inlet 13, the side wall of the reactor 1 above the filter material 10 is provided with a back flush water outlet 14, and the liquid outlet 3 and the back flush water inlet 13 are both positioned below the aeration device 8.
The bottom of the reactor 1 is also provided with a slag discharge port 15.
Example 2
The use method of the microwave liquid phase discharge-biological aerated filter coupling device comprises the following steps:
s101, injecting the oilfield fracturing flow-back fluid into a reactor 1 through a water inlet 2 of the reactor 1, wherein the injection flow rate of the oilfield fracturing flow-back fluid is controlled to be 9 x 10-7m3/s；
S102, turning on a microwave generator 4 and an aeration device 8 to control a power supply, adjusting the input power of the microwave generator 4, maintaining the power above 2000W, and adjusting the aeration device 8 to enable the dissolved oxygen at the top of the reactor 1 to be 3-4 mg/L;
s103, treating the oilfield fracturing flow-back fluid by a microwave liquid-phase discharge treatment unit, allowing the wastewater to flow downwards under the action of gravity, and treating the wastewater again by a filter material 10 and an aeration device 8;
s104, the treated wastewater is discharged to the outside of the reactor 1 through the liquid outlet 3.
When the coupling process is in operation, a control switch of a buffer water tank is firstly opened, the oilfield fracturing flow-back fluid is injected into a coupling process reactor through a water inlet of the coupling process, and the inflow flow rate is controlled to be 9 multiplied by 10-7m3S; (ii) a Turning on a control power supply of the microwave generator and the aeration device, and simultaneously adjusting the input power of the microwave generator; due to the aeration effect of the aeration device, a large amount of bubbles are filled in the reactor, and the power of the aeration device is adjusted to ensure that the dissolved oxygen at the top of the reactor is 3-4 mg/L; the oil field fracturing flow-back fluid injected into the reactor is firstly treated by a microwave liquid-phase discharge treatment unit, and a groove of a microwave plasma excitation device is discharged to generate a large amount of high-energy electrons, free radicals, active atoms, molecules and the like, so that macromolecular substances such as guar gum and the like in the oil field fracturing flow-back fluid can be effectively degraded; the microwave discharge interval is 40min, and the discharge duration is 20 min. After being treated by the microwave liquid-phase discharge treatment unit, the wastewater is transferred to the biological aerated filter treatment unit under the action of gravity, and the glauconite filter material in the biological aerated filter is attached with more microbial micelles, so that the biological aerated filter has stronger adsorption and degradation capacity on organic matters; the finally treated wastewater is discharged to the outside of the reactor through a final water outlet; the hydraulic load of the reactor was 3.1X 10-3m3The volume load of the reactor can reach 5kg COD/(m)3H); in the reactionA slag discharge port is arranged at the bottom of the device, and the slag discharge period is 144 h; each time the biological aerated filter treatment unit is operated for a period of time, the biological aerated filter treatment unit needs to be subjected to back washing treatment, during the back washing process, back washing clean water is injected into the bottom of the biological aerated filter treatment unit through a back washing water inlet, and the flow speed of the back washing water is 2.7 multiplied by 10-6m3And/s, the glauconite filter material in the biological aerated filter treatment unit is subjected to hydraulic scouring to ensure the glauconite filter material to have regenerated filtering and treatment capacity, backwash cleaning water is discharged out of the system through a backwash water outlet, the backwash cycle is controlled to be 70 hours, and each flushing time is 2 hours.
In the embodiment, a microwave liquid phase discharge-biological aerated filter coupling process is adopted; the bottom of the biological aerated filter is provided with an aeration mode with a gas-water ratio, so that the requirement of dissolved oxygen in the biological aerated filter is ensured, and a discharge gas source is provided for a microwave discharge unit at the top end; the glauconite filter material is cheap and easy to obtain, and has high porosity and biological adhesiveness; the coupling process reactor of the embodiment is in an inclined plate form at the bottom and is provided with a slag discharge port, so that the quality of final effluent is improved.
The advantage of the discharge-biological coupling combination of the embodiment is that the microwave excited plasma is generated in the gas sheath layer near the groove, and the aeration device arranged at the bottom of the filter chamber can continuously provide a gas source for the discharge, so that the ignition power of the plasma is reduced, and the energy consumption is saved. Meanwhile, the alkalinity of the fracturing flow-back fluid is high, the alkaline substance is used as an electrolyte, so that the ignition power is further reduced, the energy utilization efficiency is improved, the acid catalytic reaction is avoided, the liquid-phase product generated by discharge is relatively simple, and the subsequent treatment of microorganisms is facilitated.
Degradation experiments
A coupling process reactor with the effective volume of 16L is adopted to carry out degradation experiments on the fracturing flow-back fluid of the oil field. Sampling every 3 days to determine COD, petroleum substances, suspended solids and ammonia nitrogen in the flowback liquid sewage by the coupling process. The experimental data are shown in FIGS. 3-7. In the coupling process, the removal effect of the microwave discharge on COD is only 9.8% which is poorer than other indexes, and the treatment effect on ammonia nitrogen is relatively better and reaches 47.3%. The oil content and the removal rate of suspended matters are respectively 21.6 percent and 23.1 percent. Although microwave discharge has relatively low removal rate to various indexes, high-energy free radicals have good chain scission effect to macromolecular substances such as guar gum and the like, and the macromolecular guar gum is converted into a smaller molecular form, so that the macromolecular guar gum can be continuously treated by a biological filter, wherein the removal rates of COD, oil content, suspended matters and ammonia nitrogen by a biological treatment unit can respectively reach 70.0%, 57.1%, 74.4% and 51.9%. The COD, the oil content, the suspended matters and the ammonia nitrogen in the final effluent respectively reach 79.7 percent, 78.7 percent, 97.5 percent and 99.1 percent, and all indexes have higher treatment effects. The coupling process solves the difficult problem that macromolecular substances in the oilfield fracturing flow-back fluid are difficult to degrade by a biological treatment process, and provides a new process combination form for oilfield fracturing flow-back fluid treatment.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a microwave liquid phase discharges-bological aerated filter coupling device which characterized in that, includes reactor (1), reactor (1) top is equipped with water inlet (2), and the bottom is equipped with leakage fluid dram (3), and reactor (1) upper portion is microwave liquid phase discharge processing unit, and the lower part is bological aerated filter processing unit:
the microwave liquid phase discharge processing unit comprises a microwave generator (4) and a plasma excitation device (5), wherein the plasma excitation device (5) comprises a waveguide tube (6) and quartz (7), one end of the waveguide tube (6) is connected with the microwave generator (4), the other end of the waveguide tube is arranged on the side wall of the reactor (1) corresponding to the microwave liquid phase discharge processing unit of the reactor (1), the quartz (7) is arranged in the waveguide tube (6), and a plurality of grooves (11) are formed in the outer surface of the quartz (7);
the biological aerated filter treatment unit is sequentially provided with an aeration device (8), a bearing plate (9) and a filter material (10) from bottom to top, the aeration device (8) is connected with an oxygen supply device, and the bearing plate (9) is provided with an aperture which is smaller than the diameter of the filter material (10).
2. A microwave liquid phase discharge-biological aerated filter coupling device according to claim 1, wherein said waveguide (6) is a rectangular waveguide.
3. A microwave liquid phase discharge-bological aerated filter coupling device according to claim 1, wherein said water inlet (2) is connected with a buffer tank (12).
4. A microwave liquid phase discharge-biological aerated filter coupling device according to claim 1, wherein the filter material (10) is a glauconite filter material.
5. A microwave liquid phase discharge-biological aerated filter coupling device according to claim 1, wherein the bottom of the reactor (1) is further provided with a back flush water inlet (13), the side wall of the reactor (1) above the filter material (10) is provided with a back flush water outlet (14), and the liquid outlet (3) and the back flush water inlet (13) are both positioned below the aeration device (8).
6. A microwave liquid phase discharge-biological aerated filter coupling device according to claim 1, wherein the bottom of the reactor (1) is further provided with a slag discharge port (15).
7. A method of using a microwave liquid phase discharge-biological aerated filter coupling device according to claim 1, comprising the steps of:
s101, injecting the oilfield fracturing flow-back fluid into a reactor (1) through a water inlet (2) of the reactor (1), and controlling the injection flow rate of the oilfield fracturing flow-back fluid to be 9 x 10-7m3/s；
S102, turning on a microwave generator (4) and an aeration device (8) to control a power supply, adjusting the input power of the microwave generator (4), and adjusting the aeration device (8) to enable the dissolved oxygen at the top of the reactor (1) to be 3-4 mg/L;
s103, treating the oilfield fracturing flow-back fluid by a microwave liquid-phase discharge treatment unit, allowing the wastewater to flow downwards under the action of gravity, and treating the wastewater again by a filter material (10) and an aeration device (8);
s104, discharging the treated wastewater to the outside of the reactor (1) through a liquid outlet (3).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114057363A (en) * | 2022-01-17 | 2022-02-18 | 南京智感环境科技有限公司 | Physical and biological combined enhanced automatic control module and tail water treatment method |
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