CN111439867A - Quick treatment and reuse process for shale gas produced water - Google Patents
Quick treatment and reuse process for shale gas produced water Download PDFInfo
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- CN111439867A CN111439867A CN202010379364.0A CN202010379364A CN111439867A CN 111439867 A CN111439867 A CN 111439867A CN 202010379364 A CN202010379364 A CN 202010379364A CN 111439867 A CN111439867 A CN 111439867A
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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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
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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
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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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
- C02F2101/00—Nature of the contaminant
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- C02F2101/20—Heavy metals or heavy metal compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
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Abstract
The invention provides a quick treatment and reuse process for shale gas produced water. The process comprises the following steps: carrying out first filtration on the shale gas produced water to obtain a first intermediate water body; condensing suspended substances in the first intermediate water body into floccules to obtain a second intermediate water body; separating the floccules from the second intermediate water body to obtain a third intermediate water body; performing second filtration on the third intermediate water body to obtain a fourth intermediate water body; and carrying out oxidation treatment and adsorption treatment on the fourth intermediate water body to obtain the recycled water body. The beneficial effects of the invention can include: the problems of complex process, long consumed time, high energy consumption and the like of the existing produced water treatment process can be solved, the local water resource supply pressure can be reduced, the waste liquid treatment and discharge can be reduced, and the purposes of cost reduction and efficiency improvement in the fracturing technological process can be realized.
Description
Technical Field
The invention relates to a sewage treatment process, in particular to a quick treatment and recycling process for shale gas produced water.
Background
The large-scale hydraulic fracturing technology is an important means for improving productivity in the shale gas development process at the present stage, a fracturing truck is used for injecting fracturing fluid at a flow rate exceeding the absorption capacity of a target layer, one or more horizontal or vertical fractures are pressed on a stratum by using high pressure, and the fractures are supported by using a propping agent, so that the flow resistance of oil, gas and water is reduced, and flow channels of the oil, gas and water are communicated, so that the aim of collecting free shale gas in the stratum to realize exploitation is fulfilled.
A large amount of water resources are consumed in the fracturing process, and the average water consumption of a single well in the Sichuan Changning-Wien block is 40000m3In the above, a large amount of clear water is needed for preparing the fracturing fluid, so that huge pressure is brought to the supply of surrounding water resources. 30% -70% of the flowback liquid (produced water) is discharged to the ground after the fracturing operation is completed, a large amount of flowback liquid is generated to bring risks to local environmental protection, and meanwhile, the flowback liquid discharged after reaching the standard also increases the shale gas exploitation cost.
At the present stage, the treatment process of the produced water mainly comprises 3 types, namely reinjection, reuse after treatment and discharge after treatment. The requirement of reinjection treatment on water quality is the lowest, but as the country pays more attention to environmental protection and whether reinjection stratum has pollution risk to underground water is not determined, the reinjection process is gradually restricted by policies and is reduced to be unnecessary year by year. The produced water is discharged after being treated, so that the produced water is rarely adopted due to resource waste. The most main treatment mode of the shale gas produced water at the present stage is to reuse the shale gas produced water after treatment.
The produced water contains high-concentration total dissolved solids and various chemical additives, and also contains various organic and inorganic compounds and metal elements (such as Ba, Ca, Fe, Mg, Mn, Sr and the like), and the direct reuse of the produced water can ensure that the viscosity and the drag reduction rate of the fracturing fluid can not meet the industrial requirements, so a series of treatments are required to be carried out on the produced water, and pollutants such as total suspended solids, COD (chemical oxygen demand), ion concentration, microorganisms and the like of the produced water are reduced, so that the produced water meets the reuse standard.
At the present stage, the shale gas produced water is treated by adopting a method of flocculation precipitation and membrane filtration, or flocculation precipitation and multi-stage flash evaporation or multiple chemical precipitation. The 'membrane filtration' technology faces the problems of frequent membrane maintenance and replacement, large electric energy consumption, difficult field operation, high treatment cost and the like, the 'multi-stage flash evaporation' technology has the problems of complex treatment process, large energy consumption, long time consumption, incapability of realizing rapid treatment and recycling and the like, and the 'chemical precipitation' has the disadvantages of large use of chemicals and high cost. Limiting the large-scale application of these techniques to the treatment of produced water.
With the increase of the development strength of the shale gas and the rapid increase of the water resource demand, a process which is suitable for the mobile operation of a shale gas development field, can realize the rapid treatment and recycling of the shale gas produced water and ensures the smooth development of the shale gas is urgently needed.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, one of the objectives of the present invention is to provide a rapid treatment and recycling process for shale gas produced water, so as to achieve rapid and continuous treatment of shale gas produced water.
In order to achieve the above purpose, the invention provides a rapid treatment and recycling process for shale gas produced water.
The method may comprise the steps of: carrying out first filtration on the shale gas produced water to obtain a first intermediate water body; condensing suspended substances in the first intermediate water body into floccules to obtain a second intermediate water body; separating the floccules from the second intermediate water body to obtain a third intermediate water body; performing second filtration on the third intermediate water body to obtain a fourth intermediate water body; and carrying out oxidation treatment and adsorption treatment on the fourth intermediate water body to obtain the recycled water body.
According to one or more exemplary embodiments of the present invention, the step of subjecting the shale gas produced water to a first filtration may comprise: passing the shale gas produced water through a rapid filter.
According to one or more exemplary embodiments of the present invention, the step of agglomerating suspended matter in the first intermediate body of water into floes may include: and mixing the first intermediate water body with a coagulant, adjusting the pH value of the mixed water body to 7.5-8.5, and adding the coagulant aid.
According to one or more exemplary embodiments of the present invention, the coagulant may include: polymeric aluminum sulfates.
According to one or more exemplary embodiments of the present invention, the separating of the floes may include: and placing the second intermediate water body in a sedimentation tank, and separating out floccules in the second intermediate water body under the action of gravity.
According to one or more exemplary embodiments of the present invention, the sedimentation tank may include an inclined plate sedimentation tank, a perforated water distribution pipe provided at a lower portion of the sedimentation tank, and a perforated water collection pipe provided at an upper portion of the sedimentation tank.
According to one or more exemplary embodiments of the present invention, the step of subjecting the third intermediate body of water to the second filtration may include: and filtering the third intermediate water body by using an activated carbon filter layer.
According to one or more exemplary embodiments of the present invention, the step of subjecting the fourth intermediate water body to oxidation treatment may include: and carrying out oxidation treatment on the fourth intermediate water body by using an oxidant.
According to one or more exemplary embodiments of the present invention, the oxidizing agent may include: ClO2A gas.
According to one or more exemplary embodiments of the present invention, the step of subjecting the fourth intermediate water body to adsorption treatment may include: and carrying out adsorption treatment on the water body after the oxidation treatment by using an adsorbent.
According to one or more exemplary embodiments of the invention, the step of obtaining the second intermediate water body is performed in a coagulation basin, and the steps of oxidizing treatment and adsorbing treatment are performed in an oxidizing and adsorbing basin, wherein a pH value online monitoring device and a dosing pump are arranged on the coagulation basin.
According to one or more exemplary embodiments of the present invention, the dosing pump may control dosing by the pH on-line monitoring device, and the dosing pump is further communicated with the drug pool.
According to one or more exemplary embodiments of the present invention, the common metal ions and heavy metal ions in the first water body can be in the form ofForming floccules. Wherein the common metal ion may comprise Ca2+、Mg2+、Ba2+、Sr2+Total Fe (i.e., iron ions), Mn2+The heavy metal ion may include Pb2+And Cd2+At least one of (1).
Compared with the prior art, the beneficial effects of the invention can include: the problems of complex process, long consumed time, high energy consumption and the like of the existing produced water treatment process can be solved, the local water resource supply pressure can be reduced, the waste liquid treatment and discharge can be reduced, and the purposes of cost reduction and efficiency improvement in the fracturing technological process can be realized.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
fig. 1 shows a schematic flow diagram of the rapid treatment and reuse process of shale gas produced water according to the present invention.
Detailed Description
Hereinafter, the shale gas produced water rapid treatment and reuse process of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
In an exemplary embodiment of the invention, the rapid shale gas produced water treatment and reuse process may comprise: water feeding, rapid filtration, chemical coagulation, inclined plate precipitation, fine filtration, oxidation adsorption sterilization and the like. Specifically, the recycling process may comprise:
(a) and (3) rapid filtration: the shale gas produced water passes through the rapid filter to rapidly remove suspended solids in the water, and the follow-up process is ensured to be carried out.
(b) Coagulation: adding coagulant (such as polyaluminium sulfate) into sewage in coagulation tank to coagulate the coagulant with suspended matter in the sewage to form floc, adding alkaline agent, adjusting pH, and adding coagulant aid (PAM).
(c) And (3) precipitation: separating the alum floc formed in the step (b) from the sewage in a sedimentation tank by means of natural gravity, and settling the alum floc to the bottom of the sedimentation tank, wherein the upper part of the sedimentation tank is clear water after sedimentation, and the alum floc is discharged out of the sedimentation tank.
(d) Fine filtration: and (c) filtering the supernatant water of the sedimentation tank in the step (c) by using a coconut shell activated carbon filter layer to filter residual suspended matters which may not be settled.
(e) Oxidation adsorption sterilization: introducing the ClO prepared on site into the clean water obtained in the step (d)2Adding gas and adsorbent, and allowing residual organic matter in clear water to pass through ClO2And (4) removing residual substances such as heavy metals and the like through adsorption of an adsorbent.
In this embodiment, the shale produced water may contain at least one of suspended matter, organic matter, heavy metals, and TDS.
The total hardness of the water body treated by the recycling process can be lower than 200 mg/L and less than 100 mg/L, and the total Fe is less than 5 mg/L, further, the total hardness of the water body can be lower than 150 mg/L and less than 70 mg/L, and the total Fe is less than 4 mg/L, such as the total hardness of 100 +/-20 mg/L50 +/-10 mg/L and the total Fe2 +/-0.5 mg/L.
In this embodiment, in step (a), the rapid filtration of the removed suspended solids comprises: at least one of clay particles and fine drill cuttings, suspended solids with a particle size >10um, can be completely removed.
In this embodiment, in step (b), TDS and heavy metal ions (e.g., Pb) may be used2+、Cd2+Etc.) flock formation:
the TDS may include: common metal ions (e.g. Ca)2+、Mg2+、Ba2+、Sr2+Total Fe and Mn2+)。
The coagulant may include: polyaluminum sulfate coagulant.
The purpose of adding alkaline agent to regulate pH value is to make the coagulant achieve excellent coagulation effect. The basic agents may include: NaOH and/or Ca (OH)2. The pH value is 7.5-8.5, and the pH value is set in the range so as to achieve the best coagulation effect.
The coagulant aid may include: PAM. PAM is an abbreviation for Polyacrylamide, the Chinese name Polyacrylamide.
In this embodiment, in step (c), a special high-efficiency decolorizing fast precipitator (i.e., coagulant) can be added through a dosing system, and the pH is controlled to be optimal, so that a large amount of colored substances, dissolved metal ions and non-metal ions in the produced water of shale gas, a chemical additive and a treating agent (i.e., coagulant) react under a special hydraulic condition, and a substance insoluble in water under a certain condition is generated within a short time, thereby realizing the separation from water. The step can remove most of COD, metal ions and total suspended solids in the produced water, and solves the problems of complex process, long consumed time, high energy consumption and the like of the existing produced water treatment process.
In this embodiment, in step (c), the particulate matter having a particle size of 10um or more is completely removed, and the removal rate of the suspended matter is 95% or more.
In this embodiment, in step (e), the adsorbent may comprise activated carbon particles.
In this embodiment, in step (e), the water after coagulating sedimentation treatment contains a small amount of unremoved organic matter, inorganic harmful substance and other pollutants, and can enter the reactor to react with ClO2The gas reacts to oxidize organic substances into CO2Water and harmless inorganic salt are removed, harmful inorganic matters such as heavy metal are adsorbed and removed, and bacteria and the like in the water are killed, so that the organic matters and the inorganic harmful matters are quickly and efficiently oxidized and thoroughly removed under the action of the low-concentration oxidant.
In this embodiment, the sedimentation tank may be an inclined plate sedimentation tank.
The lower part of the sedimentation tank can be provided with a perforated water distribution pipe communicated with the water inlet pipe, and the upper part of the sedimentation tank is provided with a perforated water collecting pipe communicated with the filtering tank.
The lower part of the sedimentation tank can also be provided with at least one bell jar sludge discharge device communicated with a sludge discharge pipe outside the sedimentation tank.
In this embodiment, the filtering tank may be provided with a filtering layer.
In this embodiment, the oxidation adsorption tank (also referred to as oxidation adsorption sterilization tank) may be provided with a packing layer.
In this embodiment, the coagulation tank and the oxidation adsorption sterilization tank may be both provided with an online pH monitoring device and a metering pump (also referred to as a dosing pump) for controlling the feeding by the online pH monitoring device, and the metering pump is communicated with the chemical tank.
In this embodiment, the coagulant aid may be located in a coagulant aid tank, and the coagulant aid may also be provided with a metering pump. Further, the metering pump can be controlled by a pH value on-line monitoring device to feed.
In another exemplary embodiment of the invention, fig. 1 shows a schematic flow diagram of the rapid shale gas produced water treatment and reuse process of the invention.
As shown in fig. 1, the rapid treatment and reuse process of shale gas produced water may include:
(1) and (4) water is fed. The shale gas produced water may be pumped to effect water intake.
(2) And (4) rapidly filtering. The shale gas produced water is pumped into a rapid filter through a pump so as to carry out rapid filtration.
(3) And (5) chemically coagulating. The water body after rapid filtration enters a mixing tank, the pH value change of the water quality is monitored on line through the pH value, the adding amount of a coagulant and a coagulant aid is guided, the coagulant is added into the mixing tank through a medicine adding device (also called a medicine adding pump) to be uniformly mixed with the wastewater, suspended matters in the water and the coagulant are coagulated to form alum floc, and the alum floc gradually grows up.
Then coagulant aid is added through a dosing pump for coagulation, and after staying for a period of time, alum floc with better precipitation performance is formed.
The pH value of the water quality can be monitored on line by a pH value on-line monitoring device, and the pH value on-line monitoring device can be provided with a dosing controller to control a dosing pump to feed.
(4) And (4) settling by an inclined plate. This step can be carried out in a sedimentation tank and the supernatant water is obtained. And (4) allowing the water body in the above step to enter a sedimentation tank for sedimentation, and allowing the flocs to be discharged after sedimentation under the action of self gravity and enter a slag-sludge pool of a well site.
(5) And (4) fine filtering. The upper clear water is collected by the water collecting pipe and then flows through the filtering layer to be finely filtered.
(6) And (5) oxidizing, adsorbing and sterilizing. ClO can be added into the water body after fine filtration2And (3) carrying out oxidation reaction on the gas, removing residual pollutants in the water through an oxidation adsorption process, killing bacteria in the water, and further removing metal ions through activated carbon adsorption.After most of the pollution in the water is removed, the water is reused in the preparation process of the fracturing fluid. Wherein, the adding amount of the oxidant can be carried out by a dosing pump.
(7) And (4) recycling. The treated clean water can be collected in a water collecting tank to wait for liquid preparation.
The whole set of treatment process of the produced water can be 25-35 min, such as 30min, and the treatment process time is short.
In summary, the advantages of the rapid treatment and recycling process for the shale gas produced water of the present invention may include:
(1) the invention can apply chemical coagulation sedimentation, oxidation sterilization and physical adsorption to a set of flow, realizes the rapid treatment and standard-reaching recycling of the produced water, accords with the characteristics of shale gas exploitation mobile operation at the present stage, and can effectively solve the problems of water resource shortage and the like.
(2) The invention can solve the problems of complex treatment process, long time consumption, large energy consumption and the like of the existing produced water.
(3) The invention can realize the reutilization of the flowback liquid, reduce the pressure of local water resource supply in construction, reduce the waste liquid treatment discharge and realize the purposes of cost reduction and efficiency improvement in the fracturing technological process.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A quick treatment and recycling process for shale gas produced water is characterized by comprising the following steps:
carrying out first filtration on the shale gas produced water to obtain a first intermediate water body;
condensing suspended substances in the first intermediate water body into floccules to obtain a second intermediate water body;
separating the floccules from the second intermediate water body to obtain a third intermediate water body;
performing second filtration on the third intermediate water body to obtain a fourth intermediate water body;
and carrying out oxidation treatment and adsorption treatment on the fourth intermediate water body to obtain the recycled water body.
2. The shale gas produced water rapid treatment and reuse process according to claim 1, wherein the step of first filtering the shale gas produced water comprises:
passing the shale gas produced water through a rapid filter.
3. The shale gas produced water rapid treatment and reuse process according to claim 1, wherein the step of agglomerating suspended matter in a first intermediate water body into floes comprises:
and mixing the first intermediate water body with a coagulant, adjusting the pH value of the mixed water body to 7.5-8.5, and adding the coagulant aid.
4. The shale gas produced water rapid treatment and reuse process according to claim 3, wherein the coagulant comprises: polymeric aluminum sulfates.
5. The process of claim 1, wherein the step of separating floes comprises:
and placing the second intermediate water body in a sedimentation tank, and separating out floccules in the second intermediate water body under the action of gravity.
6. The shale gas produced water rapid treatment and reuse process according to claim 5, characterized in that a perforated water distribution pipe is arranged at the lower part of the sedimentation tank, a perforated water collection pipe is arranged at the upper part of the sedimentation tank, and the sedimentation tank comprises an inclined plate sedimentation tank.
7. The shale gas produced water rapid treatment and reuse process according to claim 1, wherein the step of subjecting the third intermediate water body to second filtration comprises: and filtering the third intermediate water body by using an activated carbon filter layer.
8. The shale gas produced water rapid treatment and reuse process according to claim 1, wherein the step of subjecting the fourth intermediate water body to oxidation treatment comprises: and carrying out oxidation treatment on the fourth intermediate water body by using an oxidant.
9. The shale gas produced water rapid treatment and reuse process according to claim 8, wherein the step of performing adsorption treatment on the fourth intermediate water body comprises: and carrying out adsorption treatment on the water body after the oxidation treatment by using an adsorbent.
10. The shale gas produced water rapid treatment and reuse process according to claim 1, wherein the step of obtaining the second intermediate water body is performed in a coagulation tank, and the steps of oxidation treatment and adsorption treatment are performed in an oxidation adsorption tank, wherein,
and a pH value on-line monitoring device and a dosing pump are arranged on the coagulation tank.
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| CN113716753A (en) * | 2021-09-17 | 2021-11-30 | 四川大学 | Processing system of oil gas field gas production waste water |
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Application publication date: 20200724 |