CN106045145A - Method and device for treating waste fracturing liquid of oil and gas field - Google Patents
Method and device for treating waste fracturing liquid of oil and gas field Download PDFInfo
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- CN106045145A CN106045145A CN201610620479.8A CN201610620479A CN106045145A CN 106045145 A CN106045145 A CN 106045145A CN 201610620479 A CN201610620479 A CN 201610620479A CN 106045145 A CN106045145 A CN 106045145A
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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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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
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- 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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- 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
- C02F1/722—Oxidation by peroxides
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- 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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- 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
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
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- 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
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
- C02F2201/46125—Electrical variables
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/46155—Heating or cooling
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Water Treatment By Electricity Or Magnetism (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention provides a method and a device for treating the waste fracturing liquid of an oil and gas field, belonging to the technical field of oil and gas field environmental protection engineering; the method and the device are capable of meeting the demands of different treatment purposes of the waste fracturing liquid. The method comprises the following steps: sequentially carrying out chemical oxidation, electric flocculation and coarse filter treatment on the waste fracturing liquid; carrying out three-dimensional electric catalytic oxidation treatment on the waste liquid subjected to the coarse filter treatment; carrying out refined filtration treatment on the waste liquid subjected to the three-dimensional electric catalytic oxidation treatment to obtain liquid which is in accordance with a liquid preparation standard of the fracturing liquid. The method for treating the waste fracturing liquid of the oil and gas field can be applied to a treatment process of the waste fracturing liquid of the oil and gas field.
Description
Technical field
The present invention relates to oil gas field environment-friendly engineering technical field, particularly to the processing method of a kind of oil-gas field fracturing waste liquor
And processing means.
Background technology
Pressure break is the major measure of a well production increment, widely used for each oil gas field, and particularly low-permeability oil deposit is opened
During Faing.Can produce substantial amounts of waste liquid in pressing crack construction process, in waste liquid, the existing clay particle taken out of from stratum, the most former
The pollutant such as the additive in oil and fracturing fluid, wherein main component is that solid suspension (includes that formation fines, pressure break support
Agent, broken glue residue and mechanical admixture), crude oil, dissolved organic matter, inorganic salt, antibacterial etc., be a kind of complexity, stable of forming
Heterogeneous dispersion.Fracturing waste liquor or return discharge opeing, is generally of that viscosity is high, composition is complicated, pollutant levels are high, COD
Height, pollutant difficult degradation, mineralizer and mechanical admixture high, serious harm Environmental security.Further, total due to fracturing waste liquor
Amount is very big, as being directly entered water of oil-gas field processing system, it will has a strong impact on defeated properly functioning with processing system of water collection, disturbs
The normal production of oil gas field.Can reach at present discharge standard or can circulating and recovering few, the processing technological flow of proposition or
Difficulty is up to standard or actual infeasible or processing cost is higher.
At present, the process of fracturing waste liquor uses combined technique more, disclosed " changing such as CN 104045179 A
Learn oxidation-flocculation-settlement separate ", " oxidation-flocculation-liquid-solid centrifugation-ion exchange resin mistake of CN 105064970 A
Filter ", " flocculation and electrochemical oxidation-oxidant advanced oxidation-ultrafiltration membrance filter " of CN 104140173 A, CN 105217850
A " flocculation pretreatment-Fenton and the collaborative electrolysis advanced oxidation-activated carbon adsorption of ferrum carbon primary oxidation-inertia ", CN 104556486
Methods such as " flocculation separation-High Temperature High Pressure (260-340 DEG C, the 8-15MPa) chemical oxidations " of A.Wherein, " chemical oxidation-flocculation-
Settlement separate " in method the settlement separate time longer be not suitable for commercial Application；" oxidation-flocculation-liquid-solid centrifugation-ion is put
Change resin filter " " being directly entered ion exchange resin filter after liquid-solid centrifugation " practical operation probability is little in method；
In " flocculation and electrochemical oxidation-oxidant advanced oxidation-ultrafiltration membrance filter " method " through chemistry advanced oxidation after direct ultra-filtration film
Filtering " practical operation probability is less；" flocculation pretreatment-Fenton and ferrum carbon primary oxidation-inertia collaborative electrolysis advanced oxidation-
Activated carbon adsorption " in method " Fenton and ferrum carbon primary oxidation " be both needed to carry out under relatively low pH, during need to use acid, therefore
Relatively big to the corrosivity of equipment, and ferrum oxidation of coal method makes material easily harden, complex technical process；" flocculation separation-high temeperature chemistry
Oxidation " method need to be carried out under high-temperature and high-pressure conditions, do not only exist safety problem, and processing cost is the highest.
To sum up, though existing fracturing waste liquor processing method has certain treatment effect, but exist or can not actual operation,
Cost is the highest or motility deficiency can not meet fracturing fluid treatment after or re-injection or outer row or the requirement of dosing again.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, it is provided that the processing method of a kind of oil-gas field fracturing waste liquor and processing means,
To meet the demand of fracturing waste liquor different disposal purpose.
An aspect of of the present present invention provides the processing method of a kind of oil-gas field fracturing waste liquor, comprises the following steps:
Fracturing waste liquor carries out chemical oxidation, electricity flocculation and coarse filtration successively process；
Waste liquid after coarse filtration being processed carries out three-dimensional electrocatalytic oxidation and processes；
The waste liquid that three-dimensional electrocatalytic oxidation processes is carried out fine straining process, obtains meeting the liquid of fracturing fluid dosing standard.
Preferably, after fine straining processes, the step that the waste liquid after fine straining is carried out ion-exchange treatment is also included.
In the technique scheme of the present invention, in chemical oxidation treatment, the oxidant used is ozone, dioxygen
At least one in water, hypochlorous acid and potassium ferrate.
Optionally, the addition of described oxidant is 500-3000mg/L.
In the technique scheme of the present invention, in electricity flocculation treatment, the electricity flocculation plate used is solvable
The aluminum of property or ferrum pole plate, tank voltage is 1-20V, and electric current density is 20-200A m-2, treatment temperature is 5-70 DEG C.
In the technique scheme of the present invention, in coarse filtration processes, walnut shell and quartz sand is utilized to carry out double-filtration.
In the technique scheme of the present invention, in three-dimensional electrocatalytic oxidation processes, the battery lead plate used is transition
Metal nano coating inert electrode, the spacing of described battery lead plate is 0.5-10cm, and tank voltage is 1-20V, and electric current density is 30-
100A·m-2, treatment temperature is 5-70 DEG C.
In the technique scheme of the present invention, in fine straining processes, utilize the ceramic post sintering pipe that filter element aperture is 1-5 μm
Filter.
In the technique scheme of the present invention, in ion-exchange treatment, the ion exchange resin used is macropore
Weak acid ion-exchange resin.
Another aspect provides a kind of enforcement oil-gas field fracturing waste liquor as described in technique scheme to process
The processing means of method, including the pretreatment unit being sequentially connected with, three-dimensional electrocatalytic oxidation unit, fine straining unit and fine processing
Unit, wherein,
Described pretreatment unit processes for fracturing waste liquor carries out chemical oxidation, electricity flocculation and coarse filtration successively；
Described fine processing unit, for the waste liquid after described fine straining unit fine straining is carried out ion-exchange treatment, is accorded with
Close the liquid of fracturing fluid dosing standard.
The invention provides the processing method and processing device of a kind of oil-gas field fracturing waste liquor, compared with existing processing method,
This method carries out pretreatment first with chemical oxidation, electricity flocculation and coarse filtration step to fracturing waste liquor, and wherein, electricity flocculation treatment can be by
It is prone to pollutant that are that be flocculated method removing and that be not easy to be flocculated method removing be efficiently removed, thus three-dimensional can be improved
The treatment effeciency of electrocatalytic oxidation, improves the treatment effeciency of oil-gas field fracturing waste liquor further.Additionally, this method is urged carrying out electricity
When changing oxidation, used three-dimensional electrocatalytic oxidation and processed, can be provided more for processing compared to two dimension electrocatalytic oxidation
Big reaction surface, improves treatment effeciency further.Further, processing method provided by the present invention adapts to model to the pH value of waste water
Enclose width, be typically not required to regulate the pH value of waste water, therefore have the strongest can actual operation, weight after fracturing waste liquor processes can be met
New preparation meets the requirement of the liquid of fracturing fluid dosing standard.
Detailed description of the invention
Technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described enforcement
Example is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, this area is common
The every other embodiment that technical staff is obtained under not making creative work premise, broadly falls into the model of present invention protection
Enclose.
The one side of the embodiment of the present invention provides the processing method of a kind of oil-gas field fracturing waste liquor, comprises the following steps:
S1: fracturing waste liquor is carried out successively chemical oxidation, electricity flocculation and coarse filtration and processes；
In this step, mainly fracturing waste liquor is carried out pretreatment, in pre-treatment step, be broadly divided into three rank
Section, i.e. chemical oxidation, electricity flocculation and coarse filtration, wherein, owing to the flocculant of electricity flocculation is original position or in-time generatin, therefore activity is relatively
Height, flocculating effect is good, and electricity flocculation has flocculation and air supporting function concurrently, while mechanical admixture is carried out flocculation removal, can
Wadding slag flocculation produced floats and removes, and after coarse filtration processes, the mechanical admixture in fracturing wastewater can be made to reach lower content, this
Sample enters back into three-dimensional electrocatalytic oxidation unit, it is possible to improve the treatment effeciency of three-dimensional electrocatalytic oxidation unit.
S2: the waste liquid after coarse filtration being processed carries out three-dimensional electrocatalytic oxidation and processes；
In this step, the waste liquid after being processed coarse filtration by three-dimensional electrocatalytic oxidation is processed, so-called three-dimensional electricity
The electrode that catalysis oxidation is used is three-diemsnional electrode, i.e. in traditional two-dimensional electrode packing particles between plates shape or clastic work
Electrode material, and make filled electrode material surface charged and become the 3rd electrode, thus occur electrochemistry anti-on its surface
Should.Compared to two dimension electrocatalytic oxidation, the reaction surface that three-dimensional electrocatalytic oxidation can provide is bigger, and treatment effeciency is higher.
S3: the waste liquid that three-dimensional electrocatalytic oxidation processes is carried out fine straining process, obtains meeting the liquid of fracturing fluid dosing standard
Body.
In this step, the waste liquid processing three-dimensional electrocatalytic oxidation carries out fine straining process, so may filter that removing particle diameter
Less impurity, obtains meeting the liquid of fracturing fluid dosing standard, thus can meet the needs of follow-up different disposal purpose.
The processing method of oil-gas field fracturing waste liquor that the embodiment of the present invention provides compared with existing processing method, first with
Chemical oxidation, electricity flocculation and coarse filtration step carry out pretreatment to fracturing waste liquor, and wherein, electricity flocculation treatment can be readily able to the side of being flocculated
That method removes and be not easy to be flocculated the pollutant that method removes and be efficiently removed, thus three-dimensional electrocatalytic oxidation can be improved
Treatment effeciency.Additionally, this method is when carrying out electrocatalytic oxidation, is used three-dimensional electrocatalytic oxidation and processed, compared to two
Dimension electrocatalytic oxidation can provide bigger reaction surface for processing, improves treatment effeciency further.Further, the present invention is carried
The processing method of the confession pH value subject range width to waste water, is typically not required to regulate the pH value of waste water, therefore have the strongest can be real
Border operability, the liquid that fracturing waste liquor can be made again to prepare after processing meets the requirement of fracturing fluid dosing standard.
In the preferred embodiment of the present invention, after fine straining processes, S4 is also included: the waste liquid after fine straining is carried out ion
The step that exchange processes.In the present embodiment, in order to obtain meeting the liquid of subsequent request, also can be to the waste liquid after fine straining
It is further processed, as method for optimizing, the present embodiment has carried out ion-exchange treatment to the waste liquid after fine straining, so
The liquid after ion exchange can be made to further conform to standard or other liquid standard of fracturing fluid dosing, thus can effectively repeat profit
Use this liquid, reach the purpose of environmental conservation.
In one embodiment of this invention, in chemical oxidation treatment, the oxidant used is ozone, hydrogen peroxide, secondary
At least one in chloric acid and potassium ferrate.In the present embodiment, selected oxidant is strong oxidizer, it is to be understood that
, in the present embodiment, spendable oxidant is not limited to above-mentioned cited, it is also possible to be known in the art its
Its oxidant, as long as can be fully oxidized by fracturing waste liquor.
In the preferred embodiment of the present invention, the addition of described oxidant is 500-3000mg/L.At the present embodiment
In, as long as the amount of the oxidant added meets above-mentioned scope and can meet functional need, concrete can be above-mentioned scope in
Arbitrary point value, such as, 1000mg/L, 1500mg/L, 2000mg/L, 2500mg/L etc..
In one embodiment of this invention, in electricity flocculation treatment, the electricity flocculation plate used is solubility
Aluminum or ferrum pole plate, tank voltage is 1-20V, and electric current density is 20-200A m-2, treatment temperature is 5-70 DEG C.In the present embodiment,
Giving parameter required in electricity flocculation treatment, those skilled in the art can be according to the situation of the fracturing waste liquor of actual treatment to upper
State parameter to be adjusted correspondingly in the range of being given.In an alternate embodiment of the invention, tank voltage can be 5V, 10V, 15V, electric current
Density can be 50A m-2、100A·m-2、150A·m-2, treatment temperature can be 10 DEG C, 20 DEG C, 30 DEG C, 40 DEG C, 50 DEG C, 60 DEG C.
In one embodiment of this invention, in coarse filtration processes, walnut shell and quartz sand is utilized to carry out double-filtration.At this
In embodiment, the waste liquid after electricity flocculation treatment need to carry out coarse filtration, as noted earlier, electricity flocculation has flocculation and air supporting concurrently
Function, is carrying out mechanical admixture while flocculation removes, also can floated by the wadding slag that flocculation produces, and so passing through coarse filtration can be by
The wadding slag that this part floats is removed, and therefore can be effectively improved the treatment effeciency of follow-up three-dimensional electrocatalytic oxidation.In this enforcement
In example, the filter medium used is walnut shell and quartz sand, it is to be understood that the present embodiment is not limited thereto, and also may be used
Coarse filtration can be carried out with other medium that walnut shell or quartz sand carry out being substituted for each other to use in this area.
In one embodiment of this invention, in three-dimensional electrocatalytic oxidation processes, the battery lead plate used is transition metal
Nano coating inert electrode, the spacing of described battery lead plate is 0.5-10cm, and tank voltage is 1-20V, and electric current density is 30-100A
m-2, treatment temperature is 5-70 DEG C.In the present embodiment, parameter required during three-dimensional electrocatalytic oxidation processes, this area are given
Above-mentioned parameter can be adjusted correspondingly in the range of being given by technical staff according to the situation of the fracturing waste liquor of actual treatment.
In an alternate embodiment of the invention, the spacing of battery lead plate can be 1cm, 2cm, 3cm, 4cm, 5cm, 6cm, 7cm, 8cm, 9cm；Tank voltage can
For 5V, 10V, 15V, electric current density can be 50A m-2、70A·m-2、90A·m-2, treatment temperature can be 10 DEG C, 20 DEG C, 30 DEG C,
40℃、50℃、60℃。
In one embodiment of this invention, in fine straining processes, the ceramic post sintering pipe that filter element aperture is 1-5 μm is utilized to carry out
Filter.In the present embodiment, before the liquid obtained after being processed by three-dimensional electrocatalytic oxidation carries out ion exchange, also it is entered
Gone fine straining process, so can ensure that in the liquid of follow-up entrance ion-exchange treatment without or to contain only relatively little of particle diameter little
In the impurity of 1 μm, thus the process of beneficially ion exchange, also avoid blocking follow-up used ion exchange resin.Permissible
Being understood by, the filter element aperture used can be also the ceramic post sintering pipe of 2 μm, 3 μm, 4 μm.Will also be appreciated that this enforcement
Example is not limited thereto, it is also possible to use other medium that can carry out being substituted for each other with ceramic post sintering pipe in this area as filter
Core.
In one embodiment of this invention, in ion-exchange treatment, the ion exchange resin used is macropore weak acid
Ion exchange resin.In the present embodiment, the ion exchange resin used is macropore weak acid ion-exchange resin, so can have
The liquid that beneficially subsequent treatment obtains meets the dosing standard of fracturing fluid such that it is able to the most effectively used.
The another aspect of the embodiment of the present invention provides the processing means of a kind of oil-gas field fracturing waste liquor, including being sequentially connected with
Pretreatment unit, three-dimensional electrocatalytic oxidation unit, fine straining unit and fine processing unit, wherein,
Described pretreatment unit processes for fracturing waste liquor carries out chemical oxidation, electricity flocculation and coarse filtration successively；
Described fine processing unit, for the waste liquid after described fine straining unit fine straining is carried out ion-exchange treatment, is accorded with
Close the liquid of fracturing fluid dosing standard.
The embodiment of the present invention additionally provides the processing means of a kind of oil-gas field fracturing waste liquor, with existing processing means phase
Ratio, the device that the present embodiment provides includes multiple modular unit, and modules unit is mutually divided the work, between different units
Cooperate effect, can effectively oil-gas field fracturing waste liquor be processed, so that whole device has the strongest in application
Can actual operation, and finally can process be met fracturing waste liquor process after again preparation meet fracturing fluid dosing standard
Liquid.
In order to be more fully described processing method and the process of the gas field fracturing waste liquor that the embodiment of the present invention is provided
Device, illustrates below in conjunction with specific embodiment.
Embodiment 1
Measure by 500mg/L and oxidant hydrogen peroxide is added certain wellfracturing waste liquid and after pipe-line mixer mix homogeneously
Pumping into after carrying out in oxidation tank aoxidizing 10min, after entering electricity flocculation unit process 10min, electricity flocculation unit water outlet is through walnut shell
After corundum double-filtration, enter three-dimensional electrocatalytic oxidation unit, after processing 15min, pump into fine straining unit through microporous filter
Water after device filtration, is incorporated to oil field reinjection water system re-injection.
Embodiment 2
Measure by 1000mg/L and oxidant potassium ferrate is added certain wellfracturing waste liquid and mixes all through pipe-line mixer
Pump into after even after oxidation tank being carried out aoxidize 15-20min, after entering electricity flocculation unit process 10min, electricity flocculation unit water outlet warp
After walnut shell and corundum double-filtration, enter three-dimensional electrocatalytic oxidation unit, after processing 15min, pump into fine straining unit through micro-
After hole filter filters, water entrance fine processing unit carries out ion-exchange treatment, and ion exchange water outlet is reused for fracturing fluid
Preparation.
Embodiment 3
Measure by 3000mg/L and oxidant hypochlorous acid is added certain wellfracturing waste liquid and through pipe-line mixer mix homogeneously
After pump into and oxidation tank carried out aoxidize after 10min, enter after electricity flocculation unit processes 20min, electricity flocculation unit water outlet is through Semen Juglandis
After shell and corundum double-filtration, enter three-dimensional electrocatalytic oxidation unit, after processing 15min, pump into fine straining unit through micropore mistake
Water after filter filtration, is incorporated to oil field water treatment system re-injection.
Comparative example
Measure by 1000mg/L and oxidant hydrogen peroxide is added certain wellfracturing waste liquid and through pipe-line mixer mix homogeneously
After pump into and oxidation tank carried out aoxidize after 10min, export out at oxidation tube and flocculant be added to the water through pipeline by 1000mg/L
After blender mixing, after entering walnut shell and corundum double-filtration, enter two dimension electrocatalytic oxidation unit, after processing 15min,
Pump into fine straining unit water after microfilter filters, be incorporated to oil field reinjection water system re-injection.
Performance test
By the liquid after fine straining unit microfilter filters in above-described embodiment 1,3 and the warp in embodiment 2
After fine straining unit microfilter filters, enter back into fine processing unit carry out the liquid after ion-exchange treatment with in comparative example
Through fine straining unit microfilter filter after liquid compare, see table 1.
The contrast of the index of correlation of liquid after treatment in table 1 embodiment 1-3 and comparative example
| Fracturing waste liquor | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example | |
| Ca2+/mg/L | 212-321 | 167 | 12 | 187 | 213 |
| Mg2+/mg/L | 33-56 | 25 | 2 | 22 | 31 |
| Fe3+/mg/L | 11-27 | 0.1 | 0.1 | 0.1 | 0.1 |
| Fe2+/mg/L | 8-32 | 0.1 | 0.1 | 0.1 | 0.1 |
| Oil/mg/L | 20-120 | 1 | 1 | 2 | 5 |
| SS/mg/L | 665-2339 | 2 | 2 | 2 | 3 |
| COD/mg/L | 5277-7560 | 212 | 156 | 293 | 451 |
| pH | 6.0-6.6 | 6.9 | 6.9 | 6.9 | 6.9 |
Result can find, compared to comparative example, the Ca in the liquid that embodiment 1-3 finally obtains, in every liter of liquid2+、
Mg2+、Fe3+、Fe2+, oil suspensions (SS), COD (COD) reduced, the water quality of liquid is effectively improved, and
In embodiment 2 after fine straining unit microfilter filters, enter back into after fine processing unit carries out ion-exchange treatment
The water quality of liquid significantly improves especially, meets oil-gas field fracturing waste liquor and can be used for follow-up different disposal purpose after treatment
Demand.
Claims (10)
1. the processing method of an oil-gas field fracturing waste liquor, it is characterised in that comprise the following steps:
Fracturing waste liquor carries out chemical oxidation, electricity flocculation and coarse filtration successively process；
Waste liquid after coarse filtration being processed carries out three-dimensional electrocatalytic oxidation and processes；
The waste liquid that three-dimensional electrocatalytic oxidation processes is carried out fine straining process, obtains meeting the liquid of fracturing fluid dosing standard.
Processing method the most according to claim 1, it is characterised in that after fine straining processes, also includes giving up after fine straining
Liquid carries out the step of ion-exchange treatment.
Processing method the most according to claim 1, it is characterised in that in chemical oxidation treatment, the oxidant used
For at least one in ozone, hydrogen peroxide, hypochlorous acid and potassium ferrate.
Processing method the most according to claim 3, it is characterised in that the addition of described oxidant is 500-3000mg/
L。
Processing method the most according to claim 1, it is characterised in that in electricity flocculation treatment, the electricity flocculation sun used
Pole pole plate is aluminum or the ferrum pole plate of solubility, and tank voltage is 1-20V, and electric current density is 20-200A m-2, treatment temperature is 5-70
℃。
Processing method the most according to claim 1, it is characterised in that in coarse filtration processes, utilize walnut shell and quartz sand
Carry out double-filtration.
Processing method the most according to claim 1, it is characterised in that in three-dimensional electrocatalytic oxidation processes, used
Battery lead plate is transition metal nano coating inert electrode, and the spacing of described battery lead plate is 0.5-10cm, and tank voltage is 1-20V, electricity
Current density is 30-100A m-2, treatment temperature is 5-70 DEG C.
Processing method the most according to claim 1, it is characterised in that in fine straining processes, utilize filter element aperture for 1-5 μm
Ceramic post sintering pipe filter.
Processing method the most according to claim 2, it is characterised in that in ion-exchange treatment, the ion used is handed over
Changing resin is macropore weak acid ion-exchange resin.
10. the processing means implementing oil-gas field fracturing waste liquor processing method as claimed in claim 2, it is characterised in that
Including the pretreatment unit being sequentially connected with, three-dimensional electrocatalytic oxidation unit, fine straining unit and fine processing unit, wherein,
Described pretreatment unit processes for fracturing waste liquor carries out chemical oxidation, electricity flocculation and coarse filtration successively；
Described fine processing unit, for the waste liquid after described fine straining unit fine straining is carried out ion-exchange treatment, obtains meeting pressure
Split the liquid of liquid dosing standard.
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| CN110642334A (en) * | 2019-09-27 | 2020-01-03 | 北京帝力伟业科技开发有限公司 | Electrochemical treatment system and method for high-viscosity fracturing flow-back fluid |
| CN110981040A (en) * | 2019-12-02 | 2020-04-10 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Fracturing flow-back fluid treatment device and treatment method |
| CN113582463A (en) * | 2021-08-16 | 2021-11-02 | 三桶油环保科技(宜兴)有限公司 | Direct-discharge treatment method for high-salinity fracturing flowback fluid |
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