CN108178363A - The total system and its integrated conduct method of shale gas field produced water - Google Patents
The total system and its integrated conduct method of shale gas field produced water Download PDFInfo
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- 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
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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Abstract
The present invention provides a kind of total systems and its integrated conduct method of shale gas field produced water.The total system of shale gas field produced water includes：Pre-processing device pre-processes the shale gas field produced water as raw water, to remove the SS in raw water, ammonia nitrogen and incrustation ion and reduce COD；Double film process equipment, are communicated in pre-processing device, and water outlet pretreated to pre-processing device carries out desalting processing to deviate from the salt in water, and obtains fresh water and concentrated water, and fresh water is directly outer to be arranged；And evaporative crystallization component, double film process equipment are communicated in, for being evaporated crystallization treatment to the concentrated water obtained after the processing of double film process equipment and obtaining Nacl.Pre-processing device, double film process equipment and MVR evaporative crystallizations component are carried out organic coupling by the present invention, so that shale gas field produced water reaches national wastewater disposition standard via the fresh water obtained after processing, and obtain Nacl after handling and reach the dry salt secondary standard of highly industry.
Description
Technical field
The present invention relates to shale gas field produced water processing technology field more particularly to a kind of synthesis of shale gas field produced water
Processing system and its integrated conduct method.
Background technology
Shale gas is a kind of unconventional gas resource, and oil in place is huge.China currently increases shale gas field development power
Degree has important strategic importance, and to adjusting China's energy consumption structure, adjusting Gas Prices have the function of positive.At present
China has preliminarily formed four big shale gas producing regions (Fuling, Changning, Weiyuan, Erdos), and production capacity is more than 70 billion cubic meters/year,
The five peak groups-Longma small stream group on the Sichuan Basin and its periphery is concentrated mainly on, development technique is hydraulic fracturing.
Due to the particularity of shale gas exploitation, need a large amount of fracturing fluid injecting stratum, carry out hydraulic fracturing job, with
A large amount of fracturing fluids, which can confuse water flooding and return, afterwards drains into earth's surface.Since fracturing outlet liquid (i.e. shale gas field produced water) both contains stratum
Salt and heavy metal in water, also containing the various chemical addition agent ingredients in fracturing fluid, therefore the water of shale gas field produced water
Matter complicated component, pollutant kind is more, if SS (Suspended Solid), various organic matters, ammonia nitrogen are (with the NH that dissociates3And NH4+
Form presence) and incrustation ion (such as Ca2+、Mg2+) etc., and show high COD (Chemical Oxygen Demand), high TDS
The " three high " feature of (Total Dissolved Solids), high SS if mishandling can pollute water environment, cause society and ask
Topic.Thus, in order to which shale gas field produced water is enable to reach outer row's standard or can be comprehensively utilized, need to remove shale gas field
The pollutant of routine in output water simultaneously carries out desalination processing.
At present, for shale gas field produced water, common processing method mainly have Physical, bioanalysis, coagulation sedimentation,
Electrochemical process, evaporation etc..At this stage, the analysis both at home and abroad based on the property feature to shale gas field produced water, is substantially
Using single-item handling technology, and the water outlet after single-item handling technical finesse, it can not meet country and shale gas field produced water reached
The outer row's standard of mark and the demand of concentrated water salt manufacturing processing.
Invention content
In view of the problem of background technology, the purpose of the present invention is to provide a kind of synthesis of shale gas field produced water
The treatment process of different purposes is carried out organic coupling, can effectively go to remove water by processing system and its integrated conduct method
In SS, COD, ammonia nitrogen and incrustation ion and obtain Nacl, and the content of SS in water is made to be less than the content of 10mg/L, COD
Content less than 100mg/L, ammonia nitrogen ＜ 5, chlorion is less than 350mg/L, and Nacl reaches the dry salt secondary standard of highly industry.
To achieve these goals, in a first aspect, the present invention provides a kind of integrated treatments of shale gas field produced water
System, including：Pre-processing device pre-processes the shale gas field produced water as raw water, with remove the SS in raw water,
Ammonia nitrogen and incrustation ion simultaneously reduce COD；Double film process equipment, are communicated in pre-processing device, pretreated to pre-processing device
Water outlet carries out desalting processing to deviate from the salt in water, and obtains fresh water and concentrated water, and fresh water is directly outer to be arranged；And evaporative crystallization group
Part is communicated in double film process equipment, for being evaporated crystallization treatment to the concentrated water obtained after the processing of double film process equipment and obtaining
To Nacl.
In second aspect, the present invention provides a kind of integrated conduct method of shale gas field produced water, including step：
S1 pre-processes the shale gas field produced water as raw water using pre-processing device, with remove the SS in raw water, ammonia nitrogen and
Incrustation ion simultaneously reduces COD；Pretreated water outlet is introduced into double film process equipment and carries out desalting processing to deviate from water by S2
Salt, and obtain fresh water and concentrated water；And S3, by the directly outer row of the fresh water obtained after desalting processing, and will be after desalting processing
Obtained concentrated water, which is introduced into, to be evaporated crystallization treatment in MVR evaporative crystallization components and obtains Nacl.
Beneficial effects of the present invention are as follows：
In the total system of shale gas field produced water according to the present invention, will to shale gas field produced water into
The pre-processing device of row pretreatment carries out double film process equipment of desalting processing and is evaporated the MVR evaporations of crystallization treatment
It crystallizes component and carries out organic coupling so that shale gas field produced water obtains after being handled via pre-processing device, double film process equipment
Fresh water in SS content less than 10mg/L, COD content be less than 100mg/L, ammonia nitrogen content be less than ＜ 5mg/L, chlorine from
The content of son is less than ＜ 350mg/L, and so as to reach national wastewater disposition standard or comprehensive utilization, and shale gas field produced water passes through
After being handled by the concentrated water obtained after pre-processing device, the processing of double film process equipment via MVR evaporative crystallization components evaporative crystallization
To Nacl can reach the dry salt secondary standard of highly industry.
In the integrated conduct method of shale gas field produced water according to the present invention, at pretreating process, double film desalinations
Science and engineering skill and evaporative crystallization treatment process organic coupling so that shale gas field produced water is via pretreating process, double film desalinations
Content of the content less than 10mg/L, COD of SS after treatment process processing in obtained fresh water is less than 100mg/L, ammonia nitrogen contains
Amount is less than ＜ 350mg/L less than the content of ＜ 5mg/L, chlorion, so as to reach national wastewater disposition standard or comprehensive utilization,
And shale gas field produced water via the concentrated water obtained after pretreating process, double film desalting processing process via evaporative crystallization at
The Nacl obtained after reason process can reach the dry salt secondary standard of highly industry.
Description of the drawings
Fig. 1 is the total system of shale gas field produced water according to the present invention and its technique stream of integrated conduct method
Cheng Tu.
Wherein, the reference numerals are as follows：
1 pre-processing device, 21 first surge tank
11 adjust 22 ultrafiltration apparatus of storage tank
12 coagulating setting tank, 23 second surge tank
13 oxidation reaction tank, 24 reverse osmosis unit
In 14 and softening 3 MVR evaporative crystallization components of settling tank
The oneth MVR evaporated crystallization devices of 15 electrolytic oxidation apparatus 31
16 combination filter, 32 dewatering drying device
The 2nd MVR evaporated crystallization devices of 161 Double-filter material filter 33
162 active carbon filter, 34 funnel filter
2 pairs of film process equipment
Specific embodiment
It is described in detail the total system of shale gas field produced water according to the present invention and its comprehensive with reference to the accompanying drawings
Close processing method.
Illustrate the total system of the shale gas field produced water of first aspect present invention first.
With reference to Fig. 1, the total system of shale gas field produced water according to the present invention includes：Pre-processing device 1, to making
Shale gas field produced water for raw water is pre-processed, to remove the SS in raw water, ammonia nitrogen and incrustation ion and reduce COD；It is double
Film process equipment 2 is communicated in pre-processing device 1, and water outlet pretreated to pre-processing device 1 carries out desalting processing to deviate from water
In salt, and obtain fresh water and concentrated water, fresh water is directly outer to be arranged；And MVR (Mechanical Vapor
Recompression) evaporative crystallization component 3 is communicated in double film process equipment 2, for being obtained after the processing of double film process equipment 2
Concentrated water be evaporated crystallization treatment and obtain Nacl.
In the total system of shale gas field produced water according to the present invention, will to shale gas field produced water into
The pre-processing device 1 of row pretreatment carries out double film process equipment 2 of desalting processing and is evaporated the MVR steamings of crystallization treatment
Hair crystallization component 3 carries out organic coupling so that after shale gas field produced water is via pre-processing device 1, the processing of double film process equipment 2
Content of the content of SS in obtained fresh water less than 10mg/L, COD is less than 100mg/L, the content of ammonia nitrogen is less than ＜ 5mg/L,
The content of chlorion is less than ＜ 350mg/L, so as to reach national wastewater disposition standard or comprehensive utilization, and shale gas field output
Water via obtained concentrated water after pre-processing device 1, the processing of double film process equipment 2 via 3 evaporative crystallization of MVR evaporative crystallizations component at
The Nacl obtained after reason can reach the dry salt secondary standard of highly industry.
With reference to Fig. 1, pre-processing device 1 may include：Storage tank 11 is adjusted, receive external raw water and raw water is cached,
Matter is measured；Coagulating setting tank 12 is communicated in and adjusts storage tank 11, anti-for exchanging the water outlet progress coagulant precipitation after storage tank 11 caches
Should, to remove the part SS in water removal and reduce COD；Oxidation reaction tank 13 is communicated in coagulating setting tank 12, for coagulant precipitation
The water outlet of tank 12 carries out oxidation reaction, with the organic matter in degradation water；Softening settling tank 14 is neutralized, is communicated in oxidation reaction tank
13, for being softened to the water outlet of oxidation reaction tank 13 and precipitation reaction, to remove the incrustation ion in water removal and reduce COD；
Electrolytic oxidation apparatus 15 is communicated in neutralization softening settling tank 14, anti-for to the water outlet for neutralizing softening settling tank 14 aoxidize
Should, to remove the ammonia nitrogen in water removal and further reduce COD；And combination filter 16, electrolytic oxidation apparatus 15 is communicated in, is used for
Processing is filtered to the water outlet of electrolytic oxidation apparatus 15, further to remove the SS in water removal and reduce COD.
Before raw water is pre-processed without pre-processing device 1, the content of SS is generally between 300mg/L-2900mg/L in water,
The content of COD is between 2000mg/L-2500mg/L, and the content of ammonia nitrogen is between 80mg/L-100mg/L, Ca2+Contain
Amount is less than 250mg/L, Mg2+Content be less than 40mg/L.
After raw water enters pre-processing device 1, since pre-processing device 1 has gathered the processing unit of a variety of different function, from
And the pollutant substep in raw water is removed, the water outlet finally obtained meets the influent quality condition of double film process equipment 2, i.e., in advance
The content for effluent SS that treated is less than 10mg/L, and the content of COD is less than 60mg/L, and the content of ammonia nitrogen is less than 5mg/L, Ca2+
Content be less than or equal to 15mg/L, Mg2+Content be less than or equal to 10mg/L.
Pre-processing device 1 in the total system of the shale gas field produced water for the present invention that remarks additionally below.
In storage tank 11 is adjusted, raw water needs to stand a period of time so that raw water is cached and reaches amount and homogeneous.
In coagulating setting tank 12, coagulant and flocculant have been usually added into, the water outlet after the caching of storage tank 11 has been adjusted to enter mixed
After in solidifying settling tank 12, the SS (SS for including different-grain diameter size) in water is combined with each other under the action of coagulant and flocculant
And the bottom of coagulating setting tank 12 is fallen to, so as to achieve the purpose that remove part SS and reduce COD.It is reacted via coagulant precipitation
Afterwards, the content of the SS in water outlet is smaller than 100mg/L.
Pollutant in shale gas field produced water is numerous, other than the SS of different-grain diameter size, usually also contain there are many
Organic matter, nitrite, sulfide, ferrous salt etc., but main or organic matter.Therefore, in order in effectively degradation water
Organic matter, can sequentially add sodium hypochlorite (NaClO) in oxidation reaction tank 13 and Fenton reagent carries out two-stage oxidation, from
And farthest the oxidation operation in water is degraded to CO2And H2O.Meanwhile it is tried in sodium hypochlorite (NaClO) and Fenton
Under the action of agent, moreover it is possible to remove the part ammonia nitrogen in water removal.
It remarks additionally herein, COD (COD) refers under certain conditions, using certain Strong oxdiative
When agent handles water sample, the amount of the oxidant consumed.And reducing substances are (in shale gas field produced water in COD conduct measurement water
Predominantly organic matter) the how many index of content, COD is bigger, illustrates that water body is more serious by the pollution of organic matter.
Contain a large amount of inorganic salts in water outlet in oxidation reaction tank 13 after oxidation reaction, contain in inorganic salts not of the same race
The incrustation ion of class, such as calcium, magnesium, barium, strontium bivalent metal ion.In order to go water removal in incrustation ion, usually can in and
Soften and sodium hydroxide (NaOH) and sodium carbonate (Na are added in settling tank 142CO3) softened and precipitation reaction.Via softening and
After precipitation reaction, the Ca in water outlet2+Content may be less than or equal to 15mg/L, Mg2+Content may be less than or equal to 10mg/L,
The content of COD is smaller than 100mg/L.
In electrolytic oxidation apparatus 15, the water outlet for softening settling tank 14 to neutralizing directly goes to remove water using electrochemical oxidation process
In ammonia nitrogen (i.e. NH3And NH4+) and further reduce COD, this method need not add any reagent, simple and convenient, and can
Make NH3And NH4+Content be less than 5mg/L, the content of COD is less than 80mg/L, while can also remove a small amount of SS.
In combination filter 16, combination filter 16 may include：Double-filter material filter 161 is communicated in electrolytic oxidation dress
15 are put, for carrying out a filtration treatment to the water outlet of electrolytic oxidation apparatus 15；And active carbon filter 162, it is communicated in double
Filtering material filter 161, for carrying out secondary filter processing to the water outlet of Double-filter material filter 161.Combination filter 16 can be into
The SS and reduce COD that one step is gone in water removal, are smaller than via the content of the effluent SS after 16 filtration treatment of combination filter
The content of 10mg/L, COD are smaller than 60mg/L.
Via the influent quality requirement of treated water outlet the meets double film process equipment 2 of pre-processing device 1, can be introduced directly into
In double film process equipment 2.Salt in the effect of double film process equipment 2 mainly abjection water, makes the fresh water of output (purify
Water) reach in national wastewater disposition standard to ClConcentration requirement.
Double film process equipment 2 may include：First surge tank 21, is communicated in pre-processing device 1, for it is pretreated go out
Water is cached；Ultrafiltration apparatus 22 is communicated in the first surge tank 21, surpasses for the water outlet after being cached to the first surge tank 21
Filter is handled, to remove the colloid pollutant in water removal；Second surge tank 23, is communicated in ultrafiltration apparatus 22, for ultrafiltration apparatus
22 treated water outlet cached；And reverse osmosis unit 24, the second surge tank 23 is communicated in, for the second surge tank 23
Water outlet after caching carries out reverse-osmosis treated, and to deviate from the salt in water and obtain fresh water and concentrated water, fresh water is directly outer to be arranged.
Since double film process equipment 2 have gathered ultrafiltration apparatus 22 and reverse osmosis unit 24, and the combination tool of both devices
Have high treating effect, stable quality, be easily achieved automatically control, many advantages, such as floor space is small, so as to make via at double films
Manage Cl in treated the fresh water of equipment 2Content be less than 350mg/L (meet national wastewater disposition standard), it is light because obtained from
Water directly outer can be arranged or comprehensively utilize.
Double film process equipment 2 in the total system of the shale gas field produced water for the present invention that remarks additionally below.
In the first surge tank 21, the pretreated water outlet of pre-processing device 1 needs to stand one in the first surge tank 21
Section the time with into row buffering and reach amount and homogeneous, so as to achieve the purpose that caching.
Ultrafiltration membrane is provided in ultrafiltration apparatus 22, ultrafiltration membrane has the characteristics that Selective Separation.Under pressure, first
The colloid pollutant contained in water outlet after the caching of surge tank 21 is trapped within outside ultrafiltration membrane, and small hydrone, salt etc.
Then penetrate ultrafiltration membrane.The purpose of ultrafiltration apparatus 22 is to service and ensure that the effluent quality of ultrafiltration apparatus 22 is expired for reverse osmosis unit 24
The influent quality requirement of sufficient reverse osmosis unit 24.
Since ultrafiltration apparatus 22 is different from the pressure inside reverse osmosis unit 24, thus need to set the second surge tank 23,
The purpose of second surge tank 23 be to ultrafiltration apparatus 22 treated be discharged into row buffering and reach amount and homogeneous.
Be provided with reverse osmosis membrane in reverse osmosis unit 24, reverse osmosis membrane by the hydrone in the water outlet of the second surge tank 23 and
Salt detaches, and so as to obtain fresh water and concentrated water, and fresh water meets national wastewater disposition standard, can directly outer row or comprehensive profit
With, and obtained concentrated water can be used for industrial salt manufacturing.
MVR evaporative crystallizations component 3 may include：First MVR evaporated crystallization devices 31 are communicated in reverse osmosis unit 24, are used for
Crystallization treatment is evaporated to the concentrated water obtained after reverse-osmosis treated and respectively obtains salt slurry, mother liquor and evaporation condensed water, is evaporated
Condensed water is directly outer to be arranged；Dewatering drying device 32 is communicated in the first MVR evaporated crystallization devices 31, is tied for being evaporated to the first MVR
The salt slurry that brilliant device 31 obtains after handling, which is dried, handles and obtains Nacl；And the 2nd MVR evaporated crystallization device 33, even
The first MVR evaporated crystallization devices 31 are passed through, for being carried out again to the mother liquor obtained after the processing of the first MVR evaporated crystallization devices 31
Evaporative crystallization handles and obtains industrial carnallite (also obtaining the evaporation condensed water that can directly arrange outside).Further, MVR evaporations knot
Brilliant component 3 may also include：Funnel filter 34 carries out the industrial carnallite obtained after the processing of the 2nd MVR evaporated crystallization devices 33
Filtering.
In MVR evaporative crystallizations component 3, evaporated after being handled via 31 evaporative crystallization of the first MVR evaporated crystallization devices
Evaporation condensed water, which is obtained, after condensed water and the processing of 33 evaporative crystallization of the 2nd MVR evaporated crystallization devices meets national wastewater disposition mark
Standard directly outer can be arranged or be comprehensively utilized, obtained after being handled via the first MVR evaporated crystallization devices 31 and dewatering drying device 32
Nacl meets《Nacl》The dry salt secondary standard of standard GB/T5462-2015 highly industries, and via the first MVR evaporative crystallizations
The industrial carnallite that device 31, the 2nd MVR evaporated crystallization devices 33 and funnel filter 34 obtain after handling can be used for oil gas
Used in field exploitation, production and life, such as deicing salt, drilling well auxiliary agent.
Then illustrate the integrated conduct method of the shale gas field produced water of second aspect of the present invention.
With reference to Fig. 1, the integrated conduct method of shale gas field produced water according to the present invention includes step：S1, using pre- place
Reason equipment 1 pre-processes the shale gas field produced water as raw water, to remove the SS in raw water, ammonia nitrogen and incrustation ion simultaneously
Reduce COD；Pretreated water outlet is introduced into double film process equipment 2 and carries out desalting processing to deviate from the salt in water by S2, and
Obtain fresh water and concentrated water；And S3, the fresh water obtained after desalting processing is directly arranged outside, and the concentrated water that will be obtained after desalting processing
It is introduced into and is evaporated crystallization treatment in MVR evaporative crystallizations component 3 and obtains Nacl.
In the integrated conduct method of shale gas field produced water according to the present invention, at pretreating process, double film desalinations
Science and engineering skill and evaporative crystallization treatment process organic coupling so that shale gas field produced water is via pretreating process, double film desalinations
Content of the content less than 10mg/L, COD of SS after treatment process processing in obtained fresh water is less than 100mg/L, ammonia nitrogen contains
Amount is less than ＜ 350mg/L less than the content of ＜ 5mg/L, chlorion, so as to reach national wastewater disposition standard or comprehensive utilization,
And shale gas field produced water via the concentrated water obtained after pretreating process, double film desalting processing process via evaporative crystallization at
The Nacl obtained after reason process can reach the dry salt secondary standard of highly industry.
Reference Fig. 1, in step sl, it may include step：Raw water is introduced into and adjusts in storage tank 11 and in storage tank 11 is adjusted by S11
Caching, is measured homogeneous；S12 will adjust the water outlet after being cached in storage tank 11 to be introduced into progress coagulant precipitation in coagulating setting tank 12 anti-
Should, to remove the part SS in water removal and reduce COD；Water outlet after being reacted in coagulating setting tank 12 is introduced oxidation reaction tank by S13
Oxidation reaction is carried out in 13, with the organic matter in degradation water；Water outlet after being reacted in oxidation reaction tank 13 is introduced and neutralized by S14
Softened and precipitation reaction in softening settling tank 14, to remove the incrustation ion in water removal and reduce COD；S15 softens neutralizing
Water outlet after being reacted in settling tank 14 is introduced into electrolytic oxidation apparatus 15 and electrolytic oxidation reaction is carried out under conditions of energization, with
Go water removal in ammonia nitrogen and further reduce COD；And S16, the water outlet after being reacted in electrolytic oxidation apparatus 15 is introduced into combination
Processing is filtered in filter 16, further to remove the SS in water removal and reduce COD.
Before raw water is not pre-processed, the content of SS is generally between 300mg/L-2900mg/L in water, and COD's contains
Amount is between 2000mg/L-2500mg/L, and the content of ammonia nitrogen is between 80mg/L-100mg/L, Ca2+Content be less than
250mg/L, Mg2+Content be less than 40mg/L.
After raw water carries out pretreating process, due to having gathered the processing work of a variety of different processing functions in pretreating process
Skill, so as to remove the pollutant substep in raw water, the water outlet finally obtained meets the influent quality of double film desalting processing techniques
It is required that the content of that is, pretreated effluent SS is less than 10mg/L, the content of COD is less than 60mg/L, and the content of ammonia nitrogen is less than
5mg/L, Ca2+Content be less than or equal to 15mg/L, Mg2+Content be less than or equal to 10mg/L.
In step s 12, being added in coagulating setting tank 12 has coagulant and flocculant, and the SS in water is (including different-grain diameter
The SS of size) under the action of coagulant and flocculant, it is combined with each other and forms large-sized SS and be then deposited in coagulant precipitation
The bottom of tank 12, so as to achieve the purpose that remove part SS and reduce COD.After step S12, the content of the SS in water outlet can
Less than 100mg/L.
Sodium hypochlorite (NaClO) and Fenton reagent have been sequentially added in step S13, oxidation reaction tank 13 with to coagulation
Organic matter in water outlet after sedimentation reaction carries out two-stage oxidation, so as to farthest by the oxidation operation in water into inorganic
Salt.Meanwhile under the oxidation of sodium hypochlorite (NaClO) and Fenton reagent, moreover it is possible to remove the part ammonia nitrogen in water removal.This
In, the Fenton reagent of use generally can be ferric sulfate (FeSO4) and hydrogen peroxide (H2O2) mixture, wherein ferric sulfate
(FeSO4) and hydrogen peroxide (H2O2) quality proportioning can be 8~15.
In step S14, usually sodium hydroxide (NaOH) and sodium carbonate can be added in and in softening settling tank 14
(Na2CO3) softened and precipitation reaction.After step S14, the Ca in water outlet2+Content may be less than or equal to 15mg/L,
Mg2+Content may be less than or equal to 10mg/L, the content of COD is smaller than 100mg/L.
In step S15, directly it is powered the water outlet for neutralizing softening settling tank 14 to carry out electrochemical oxidation, it is this
Electrochemical oxidation process need not add any reagent, simple and convenient, and can make NH3And NH4+Content be less than 5mg/L, COD's contains
Amount is less than 80mg/L, while can also remove a small amount of SS.
In step s 16, it may include step：S161, the water outlet introducing after being reacted in electrolytic oxidation apparatus 15 were combined
In the Double-filter material filter 161 of filter 16 and carry out a filtration treatment；And S162, by going out in Double-filter material filter 161
Water is introduced into the active carbon filter 162 of combination filter 16 and carries out secondary filter processing.After step S16, in water outlet
The content of SS is smaller than 10mg/L, and the content of COD is smaller than 60mg/L.
Via the influent quality requirement of pretreating process treated water outlet meets double film desalting processing techniques, so as to straight
It connects to be introduced into double film process equipment 2 and carries out desalting processing.Via the fresh water (i.e. purified water) obtained after double film desalting processing techniques
Reach in national wastewater disposition standard to ClConcentration requirement.
In step s 2, it may include step：Pretreated water outlet is introduced into the first surge tank 21 and caches by S21；S22,
Water outlet after first surge tank 21 is cached, which is introduced into ultrafiltration apparatus 22, carries out hyperfiltration treatment, the colloidal type in water removal to be gone to pollute
Object；Water outlet after hyperfiltration treatment is introduced into the second surge tank 23 and caches by S23；S24, going out after the second surge tank 23 is cached
Water, which is introduced into reverse osmosis unit 24, carries out reverse-osmosis treated, to deviate from the salt in water and obtain fresh water and concentrated water；And S25,
By the directly outer row of the fresh water obtained after reverse-osmosis treated, and the concentrated water obtained after reverse-osmosis treated is introduced into MVR evaporative crystallization groups
Crystallization treatment is evaporated in part 3 and obtains Nacl.
Due to double film desalting processing process sets hyperfiltration treatment technique and ro treatment technology, and hyperfiltration treatment technique
Combination with ro treatment technology have high treating effect, stable quality, be easily achieved automatically control, that floor space is small etc. is all
More advantages, so as to make via Cl in the fresh water after double film desalting processing processContent be less than 350mg/L (meet country
Wastewater disposition standard), fresh water directly outer can be arranged or comprehensively utilize because obtained from.
The purpose of step S21 is to being discharged into row buffering via pretreated and reaching amount and homogeneous, so as to being super
Filter treatment process service.The purpose of step S23 be to via the water outlet after hyperfiltration treatment into row buffering and reach amount and homogeneous,
So as to be ro treatment technology service.
In step S22, since the ultrafiltration membrane in ultrafiltration apparatus 22 has the characteristics that Selective Separation, acted in pressure
Under, the colloid pollutant that contains is trapped within outside ultrafiltration membrane in the water outlet after the first surge tank 21 caching, and small hydrone,
Salt etc. then penetrates ultrafiltration membrane.The purpose of hyperfiltration treatment technique is that the water outlet of hyperfiltration treatment technique is serviced and ensured for step S24
Water quality meets the influent quality requirement of ro treatment technology.
In step s 24, the reverse osmosis membrane in reverse osmosis unit 24 by the hydrone in the water outlet of the second surge tank 23 and
Salt detaches, and so as to obtain fresh water and concentrated water, and fresh water meets national wastewater disposition standard, can directly outer row or comprehensive profit
With, and obtained concentrated water can be used for industrial salt manufacturing.
In step s3, it may include step：The concentrated water obtained after reverse-osmosis treated is introduced the first MVR evaporative crystallizations by S31
Crystallization treatment is evaporated in device 31 and respectively obtains salt slurry, mother liquor and evaporation condensed water；And S32, it will be obtained in step S31
To the directly outer row of evaporation condensed water, salt slurry is introduced into dewatering drying device 32 and processing is dried and obtains Nacl, mother liquor
It is introduced into the 2nd MVR evaporated crystallization devices 33 and carries out evaporative crystallization again and handle and obtain industrial carnallite (also obtaining can be direct
The evaporation condensed water of outer row).Further, in step s3, it may also include step：S33, using funnel filter 64 to second
The industrial carnallite obtained after the processing of MVR evaporated crystallization devices 63 is filtered.
In step S3 (i.e. evaporative crystallization treatment process), via the evaporation condensed water obtained after step S31 and via step
Suddenly the evaporation condensed water obtained after S32 meets national wastewater disposition standard, directly outer can arrange or comprehensively utilize, via step
The Nacl obtained after S31 and step S32 meets《Nacl》The dry salt secondary standard of standard GB/T5462-2015 highly industries,
And it can be used for oil-gas field development, production and life via the industrial carnallite obtained after step S31, step S32 and step S33
It is used, such as deicing salt, drilling well auxiliary agent.
Claims (10)
1. a kind of total system of shale gas field produced water, which is characterized in that including：
Pre-processing device (1) pre-processes the shale gas field produced water as raw water, to remove the SS in raw water, ammonia nitrogen
With incrustation ion and reduce COD；
Double film process equipment (2), are communicated in pre-processing device (1), and water outlet pretreated to pre-processing device (1) carries out desalination
To deviate from the salt in water, and obtain fresh water and concentrated water, fresh water is directly outer to be arranged for processing；And
MVR evaporative crystallizations component (3) is communicated in double film process equipment (2), for being obtained after the processing of double film process equipment (2)
Concentrated water be evaporated crystallization treatment and obtain Nacl.
2. the total system of shale gas field produced water according to claim 1, which is characterized in that pre-processing device
(1) include：
Storage tank (11) is adjusted, receive external raw water and raw water is cached, homogeneous, is measured；
Coagulating setting tank (12) is communicated in and adjusts storage tank (11), and coagulant precipitation is carried out for exchanging the water outlet after storage tank (11) caching
Reaction, to remove the part SS in water removal and reduce COD；
Oxidation reaction tank (13) is communicated in coagulating setting tank (12), anti-for to the water outlet of coagulating setting tank (12) aoxidize
Should, with the organic matter in degradation water；
Softening settling tank (14) is neutralized, is communicated in oxidation reaction tank (13), it is soft for being carried out to the water outlet of oxidation reaction tank (13)
Change and precipitation reaction, to remove the incrustation ion in water removal and reduce COD；
Electrolytic oxidation apparatus (15) is communicated in neutralization softening settling tank (14), for the water outlet to neutralizing softening settling tank (14)
Oxidation reaction is carried out, to remove the ammonia nitrogen in water removal and further reduce COD；And
Combination filter (16) is communicated in electrolytic oxidation apparatus (15), for being carried out to the water outlet of electrolytic oxidation apparatus (15)
Filter is handled, further to remove the SS in water removal and reduce COD.
3. the total system of shale gas field produced water according to claim 2, which is characterized in that combination filter
(16) include：
Double-filter material filter (161) is communicated in electrolytic oxidation apparatus (15), for being carried out to the water outlet of electrolytic oxidation apparatus (15)
Filtration treatment；And
Active carbon filter (162) is communicated in Double-filter material filter (161), for the water outlet to Double-filter material filter (161) into
The processing of row secondary filter.
4. the total system of shale gas field produced water according to claim 1, which is characterized in that double film process equipment
(2) include：
First surge tank (21) is communicated in pre-processing device (1), for being cached to pretreated water outlet；
Ultrafiltration apparatus (22) is communicated in the first surge tank (21), surpasses for the water outlet after being cached to the first surge tank (21)
Filter is handled, to remove the colloid pollutant in water removal；
Second surge tank (23) is communicated in ultrafiltration apparatus (22), for ultrafiltration apparatus (22) treated water outlet cache；
And
Reverse osmosis unit (24) is communicated in the second surge tank (23), is carried out for the water outlet after being cached to the second surge tank (23)
Reverse-osmosis treated, to deviate from the salt in water and obtain fresh water and concentrated water, fresh water is directly outer to be arranged.
5. the total system of shale gas field produced water according to claim 4, which is characterized in that MVR evaporative crystallizations
Component (3) includes：
First MVR evaporated crystallization devices (31) are communicated in reverse osmosis unit (24), for the concentrated water obtained after reverse-osmosis treated
It is evaporated crystallization treatment and respectively obtains salt slurry, mother liquor and evaporation condensed water, evaporation condensed water is directly outer to be arranged；
Dewatering drying device (32) is communicated in the first MVR evaporated crystallization devices (31), for the first MVR evaporated crystallization devices
(31) salt slurry obtained after handling, which is dried, handles and obtains Nacl；And
2nd MVR evaporated crystallization devices (33) are communicated in the first MVR evaporated crystallization devices (31), are tied for being evaporated to the first MVR
The mother liquor obtained after brilliant device (31) processing carries out evaporative crystallization again and handles and obtain industrial carnallite.
6. a kind of integrated conduct method of shale gas field produced water, which is characterized in that including step：
S1 pre-processes the shale gas field produced water as raw water using pre-processing device (1), to remove in raw water
SS, ammonia nitrogen and incrustation ion simultaneously reduce COD；
Pretreated water outlet is introduced into double film process equipment (2) and carries out desalting processing to deviate from the salt in water, and obtains by S2
To fresh water and concentrated water；And
The concentrated water obtained after desalting processing by the directly outer row of the fresh water obtained after desalting processing, and is introduced MVR evaporative crystallizations by S3
Crystallization treatment is evaporated in component (3) and obtains Nacl.
7. the integrated conduct method of shale gas field produced water according to claim 6, which is characterized in that in step sl,
Including step：
Raw water is introduced into and adjusts in storage tank (11) and adjusting the middle caching of storage tank (11), homogeneous, measuring by S11；
S12 carries out coagulant precipitation reaction, with removal by the water outlet in storage tank (11) after caching is adjusted to be introduced into coagulating setting tank (12)
Part SS and reduction COD in water；
Water outlet after reaction in coagulating setting tank (12) is introduced into oxidation reaction tank (13) and carries out oxidation reaction by S13, with degradation
Organic matter in water；
Water outlet after reaction in oxidation reaction tank (13) is introduced into neutralization softening settling tank (14) and is softened and precipitated by S14
Reaction, to remove the incrustation ion in water removal and reduce COD；
The water outlet neutralized in softening settling tank (14) after reaction is introduced into electrolytic oxidation apparatus (15) and in the item of energization by S15
Electrolytic oxidation reaction is carried out under part, to remove the ammonia nitrogen in water removal and further reduce COD；And
Water outlet after reaction in electrolytic oxidation apparatus (15) is introduced into combination filter (16) and is filtered processing by S16, with into
The SS and reduce COD that one step is gone in water removal.
8. the integrated conduct method of shale gas field produced water according to claim 7, which is characterized in that in step s 16,
Including step：
Water outlet after reaction in electrolytic oxidation apparatus (15) is introduced the Double-filter material filter of combination filter (16) by S161
(161) in and carry out a filtration treatment；And
Water outlet in Double-filter material filter (161) is introduced into the active carbon filter (162) of combination filter (16) simultaneously by S162
Carry out secondary filter processing.
9. the integrated conduct method of shale gas field produced water according to claim 6, which is characterized in that in step s 2,
Including step：
Pretreated water outlet is introduced into the first surge tank (21) and caches by S21；
S22, the water outlet after the first surge tank (21) is cached, which is introduced into ultrafiltration apparatus (22), carries out hyperfiltration treatment, to go in water removal
Colloid pollutant；
Water outlet after hyperfiltration treatment is introduced into the second surge tank (23) and caches by S23；
S24, the water outlet after the second surge tank (23) is cached, which is introduced into reverse osmosis unit (24), carries out reverse-osmosis treated, with abjection
Salt in water simultaneously obtains fresh water and concentrated water；And
The concentrated water obtained after reverse-osmosis treated by the directly outer row of the fresh water obtained after reverse-osmosis treated, and is introduced MVR and steamed by S25
Crystallization treatment is evaporated in hair crystallization component (3) and obtains Nacl.
10. the integrated conduct method of shale gas field produced water according to claim 9, which is characterized in that in step s3,
Including step：
The concentrated water obtained after reverse-osmosis treated is introduced into the first MVR evaporated crystallization devices (31) and is evaporated crystallization treatment by S31
And respectively obtain salt slurry, mother liquor and evaporation condensed water；And
The directly outer row of the evaporation condensed water obtained in step S31, salt slurry are introduced into dewatering drying device (32) and done by S32
It is dry handle and obtain Nacl, mother liquor is introduced into progress in the 2nd MVR evaporated crystallization devices (33) evaporative crystallization is handled and obtained again
To industrial carnallite.
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