CN104261587A - Recycling treating device for flowback pressure liquid in shale gas well fracturing operation - Google Patents

Recycling treating device for flowback pressure liquid in shale gas well fracturing operation Download PDF

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Publication number
CN104261587A
CN104261587A CN201410500724.2A CN201410500724A CN104261587A CN 104261587 A CN104261587 A CN 104261587A CN 201410500724 A CN201410500724 A CN 201410500724A CN 104261587 A CN104261587 A CN 104261587A
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China
Prior art keywords
shale gas
pressure power
equipment
row pressure
pool
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CN201410500724.2A
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CN104261587B (en
Inventor
潘志成
彭玉梅
李慧强
杨平
邱恋
费功全
罗荣林
李勇
陈春阳
杨开虎
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HAITIAN WATER GROUP Co Ltd
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HAITIAN WATER GROUP Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5209Regulation methods for flocculation or precipitation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/72Treatment of water, waste water, or sewage by oxidation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/20Heavy metals or heavy metal compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/10Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00Apparatus for treatment of water, waste water or sewage
    • C02F2201/002Construction details of the apparatus

Abstract

The invention discloses a recycling treating device for flowback pressure liquid in shale gas well fracturing operation. The recycling treating device comprises a wastewater pool, a regulation pool, a composite coagulation reaction device, a settling pool, a solid-liquid separation device and a clean water pool which are sequentially connected to one another by virtue of a pipeline, wherein the composite coagulation reaction device consists of a rapid stirring pool, a slow stirring pool and an oxidation pool which are sequentially connected to one another by virtue of a pipeline, and the upper ends of the regulation pool, the rapid stirring pool, the slow stirring pool and the oxidation pool are all connected with a corresponding drug adding device by virtue of a constant-flow pump; the solid-liquid separation device consists of a crude filter and double-filtering equipment which are sequentially connected to one another by virtue of a pipeline, the crude filter is connected with a sludge pump by virtue of a fourth valve, the double-filtering equipment is also connected with the sludge pump, and the sludge pump is connected with a sludge dewatering machine. With the adoption of the recycling treating device, as the bottoms of the regulation pool, the rapid stirring pool, the slow stirring pool and the oxidation pool are all provided with stirrers, the problem of water resource challenge brought by shale gas development can be effectively solved, resource cyclic utilization is reached, and zero emission of flowback liquid caused by shale gas fracturing can be truly realized.

Description

A kind of recycling treatment unit returning row pressure power liquid for shale gas well frac job
Technical field
The invention belongs to field of waste liquid treatment, specifically refer to a kind of recycling treatment unit returning row pressure power liquid for shale gas well frac job.
Background technology
?shale gas is a kind of important unconventional energy resource, China is in the upsurge of exploitation shale gas in recent years, country explicitly calls for the exploitation advancing the unconventional petroleum resourceses such as shale gas in shale gas " 12 " planning, increase natural gas source supply, alleviate China's natural gas imbalance between supply and demand, readjust the energy structure, promote energy-saving and emission-reduction.
Comparatively conventional gas is compared, and because shale formation rate of permeation is lower, development difficulty is very large.Therefore, develop the Main Means of shale gas during waterfrac treatment, but the process returning discharge opeing after pressing crack construction is difficult to meet the requirement of environmental protection.
Return row pressure power liquid and have that viscosity is large, stability is high, suspended substance is many, mineral degree is high and the feature such as complicated component.If do not deal carefully with, immeasurable loss will be caused to the long term growth of shale gas exploitation.Therefore, research shale gas fracturing outlet liquid treatment technology, seems especially important for the environmental problem alleviating development block, simultaneously significant for the normal production and Sustainable Production development that ensure shale gas.
Abroad mainly reuse the treatment process of fracturing outlet liquid, according to the display of external technical information, they consider from the production cost of hydraulic fracturing technology and environmental protection requirement, think that the recycling of water resources will be the trend of future development.Therefore improve the repeating utilization factor of existing water resources, thus reduce the dependency to Freshwater resources, this Land use systems not only reduces the cost of process fracturing outlet liquid, but also decreases contaminants associated discharge.
Treatment process mainly natural air drying and the chemical treatment of domestic fracturing outlet liquid, natural air drying is stored in by fracturing outlet liquid special to return in clean-up pit, the method of spontaneous evaporation is taked to carry out mummification, last directly landfill, this mode is the at substantial time not only, and mud after landfill soon still can fuel-displaced, the pollutent such as heavy metal, aldehyde, phenol of diafiltration, there is serious secondary pollution.
Chemical treatment is that discharge opeing is concentrated carries out dosing flocculation, filtration pre-treatment by returning, and then will return discharge opeing and be recycled in stratum, the processing technological flow of this method is complicated, and range of application has certain limitation.Because the development area of domestic shale gas all belongs to block newly developed, near there is no suitable reinjection well, need be transported to well site far away, this mode will add processing cost virtually.
Find out thus, the domestic process to shale gas fracturing outlet liquid at present does not also form the effective solution of system.In order to the needs of preserving the ecological environment, promote that shale gas develops faster and better, therefore study the new technology returning the process of row pressure power liquid liquid imperative.
Summary of the invention
The object of the invention is to: a kind of recycling treatment unit returning row pressure power liquid for shale gas well frac job is provided, enable to return the water outlet of row pressure power liquid through process and reach shale gas fracturing liquid reuse water quality requirement, solve shale gas and develop the water resources challenge brought.
The present invention is achieved through the following technical solutions: a kind of recycling treatment unit returning row pressure power liquid for shale gas well frac job, comprise the wastewater disposal basin connected in turn by pipeline, equalizing tank, complex coagulation reaction unit, settling bowl, equipment for separating liquid from solid and clean water basin, complex coagulation reaction unit comprises the rapid stirring pond connected successively by pipeline, low rate mixing pond and oxidation pond, equalizing tank upper end is connected with conditioning agent chemicals dosing plant by the first constant flow pump, rapid stirring pond is connected with flocculation agent chemicals dosing plant by the second constant flow pump, low rate mixing pond is connected with coagulant aids chemicals dosing plant by the 3rd constant flow pump, oxidation pond is connected with oxygenant chemicals dosing plant by the 4th constant flow pump, equipment for separating liquid from solid comprises the strainer and double filtering equipment that are connected successively by pipeline, coarse filtration equipment is all connected with sludge pump with double filtering equipment by the 4th valve, sludge pump is connected with sludge dewatering equipment, described equalizing tank, rapid stirring pond, low rate mixing pond, the bottom of oxidation pond is equipped with agitator.
Principle of work of the present invention: when row pressure power of the returning liquid that shale gas well frac job produces utilizes process again, be stored in wastewater disposal basin, through equalizing tank, the pH value returning row pressure power liquid is regulated by adding conditioning agent, and further by rapid stirring pond, the wherein amount that adds of flocculant poly aluminum chloride, the rotating speed of agitator and the dosage of flocculation agent all set according to the row's of returning pressure fluid of process is long-pending, fully stir when the agitator be positioned at bottom rapid stirring pond adds flocculation agent again, low rate mixing pond is entered after the process of rapid stirring pond, while inherence, low rate mixing pond adds coagulant aids, the agitator being positioned at bottom starts to stir, realize the abundant reaction returning row pressure power liquid and coagulant aids, and connect rapid stirring pond, the pipeline in low rate mixing pond is that pipeline one end is deeply in rapid stirring pond, and be positioned at the top in rapid stirring pond, the pipeline that low rate mixing pond is connected with oxidation pond, pipeline one end is deeply in low rate mixing pond, and be positioned at the top in low rate mixing pond, after the process in low rate mixing pond, returning row pressure power liquid enters in oxidation pond, oxygenant is added by oxygenant adding apparatus, limit edged stirs, then settling bowl is entered, leave standstill, enter equipment for separating liquid from solid to be further processed returning row pressure power liquid, realize solid-liquid separation, coarse filtration equipment is entered successively in equipment for separating liquid from solid, the suspended substance larger to particle diameter, be further processed, after coarse filtration device processes, again reduce further through double filtering device processes and return heavy metal ion content in row pressure power liquid, suspension content etc., after equipment for separating liquid from solid process, enter clean solution tank, now return suspended substance in row pressure power liquid, COD, heavy metal ion equal size reaches cleanup standard, can be used for preparing fracturing fluid system, meet pressing crack construction requirement.
Further, to better implement the present invention, described equalizing tank is connected with rapid stirring pond by the first valve, equalizing tank by the second valve successively with electric flocculation reaction device, filtering basin connect, filtering basin respectively with rapid stirring pond, settling bowl connects, the 3rd valve is provided with between filtering basin and settling bowl, according to suspended substance in row pressure power of the returning liquid detected, COD, the content of heavy metal ion etc., determine further, whether by carrying out electric flocculation reaction, after filtration, enter again in complex coagulation reaction unit and enter process, can realize effectively reducing returning suspended substance in row pressure power liquid, COD, the content of heavy metal ion etc.
Further, to better implement the present invention, the first thief hole is provided with successively between described wastewater disposal basin and equalizing tank, first lift pump and under meter, by the setting of the first thief hole, mainly row pressure power of the returning liquid in wastewater disposal basin is sampled, and its composition is analyzed, to determine utilizing treatment scheme; By the setting of the first lift pump, mainly by the first lift pump row pressure power of the returning liquid in wastewater disposal basin is delivered in equalizing tank and processes, can according to the treatment capacity returning device in row pressure power liquid treatment scheme by under meter, the setting unit time is interior to the treatment capacity returning row pressure power liquid.
Further, to better implement the present invention, the second lift pump, the 4th thief hole is provided with between described settling bowl and equipment for separating liquid from solid.
Further, to better implement the present invention, described 4th lift pump by one article of pipeline all with coarse filtration equipment, double filtering equipment connection, the 5th valve is provided with between 4th lift pump and coarse filtration equipment, the 6th valve is provided with between 4th lift pump and double filtering equipment, can according to the sampling analysis result returning row pressure power liquid in settling bowl, determine whether treatment scheme all needs the process by coarse filtration equipment and double filtering equipment, realize the Appropriate application to process unit, and while raising processing efficiency, ensure the treatment effect to returning row pressure power liquid.
Further, to better implement the present invention, the second thief hole is provided with between described electric flocculation reaction device and filtering basin, by the setting of the second thief hole, realize the analysis returning row pressure power liquid after electric flocculation reaction device process, to determine follow-up treatment scheme further.
Further, to better implement the present invention, the bottom of described settling bowl is connected with sedimentator, and described sedimentator mainly carries out centrifugal to the waste residue bottom settling bowl, upper strata treatment solution in centrifugal rear sedimentator can enter in filtering basin and proceed process, and sedimentator discharged by a small amount of waste residue.
Further, to better implement the present invention, the 5th thief hole is provided with between described sludge pump and coarse filtration equipment, 4th valve, the 6th thief hole is provided with between described sludge pump and double filtering equipment, by the setting of the 5th thief hole and the 6th thief hole, the treatment effect realizing returning coarse filtration equipment, double filtering device processes row pressure power liquid is monitored.
Further, to better implement the present invention, described flocculation agent chemicals dosing plant is polymerize aluminum chloride chemicals dosing plant, here preferred polymeric aluminum chloride chemicals dosing plant.
Further, to better implement the present invention, described coagulant aids chemicals dosing plant is active silicic acid chemicals dosing plant, here preferred active silicic acid chemicals dosing plant.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) the present invention is by adopting materializing strategy, advanced oxidation process position, chemical treatment is auxiliary combined treatment process, effectively reduce the content returning suspended substance, COD, heavy metal ion etc. in row pressure power liquid, make shale gas return row pressure power liquid effluent quality and reach reuse water quality standard, prepare for fracturing liquid;
(2) the recycling treatment unit returning row pressure power liquid for shale gas well frac job provided by the invention effectively can solve the water resources challenge that shale gas exploitation is brought, reach resource recycling to utilize, really can realize the zero release of shale gas fracturing outlet liquid.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Wherein: 1-wastewater disposal basin, 2-equalizing tank, 3-complex coagulation reaction unit, 4-electric flocculation reaction device, 5-settling bowl, 6-equipment for separating liquid from solid, 6-1-coarse filtration equipment, 6-2-double filtering equipment, 7-clean water basin, 8-1-the first thief hole, 8-2-the second thief hole, 8-4-the 4th thief hole, 8-5-the 5th thief hole, 8-6-the 6th thief hole, 9-1-the first valve, 9-2-the second valve, 9-3-the 3rd valve, 9-4-the 4th valve, 9-5-the 5th valve, 9-6-the 6th valve, 10-1-the first lift pump, 10-2-the second lift pump, 10-3-sludge pump, 11-under meter, 12-1-conditioning agent chemicals dosing plant, 12-2-flocculation agent chemicals dosing plant, 12-3-coagulant aids chemicals dosing plant, 12-4-oxygenant chemicals dosing plant, 13-1-the first constant flow pump, 13-2-the second constant flow pump, 13-3-the 3rd constant flow pump, 13-4-the 4th constant flow pump, 14-rapid stirring pond, 15-low rate mixing pond, 16-sludge dewatering equipment, 17-agitator, 18-oxidation pond, 19-sedimentator, 20-filtering basin.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1:
As shown in Figure 1, a kind of recycling treatment unit returning row pressure power liquid for shale gas well frac job, comprise the wastewater disposal basin 1 connected in turn by pipeline, equalizing tank 2, complex coagulation reaction unit 3, settling bowl 5, equipment for separating liquid from solid 6 and clean water basin 7, complex coagulation reaction unit 3 comprises the rapid stirring pond 14 connected successively by pipeline, low rate mixing pond 15 and oxidation pond 18, equalizing tank 2 upper end is connected with conditioning agent chemicals dosing plant 12-1 by the first constant flow pump 13-1, rapid stirring pond 14 is connected with flocculation agent chemicals dosing plant 12-2 by the second constant flow pump 13-2, low rate mixing pond 15 is connected with coagulant aids chemicals dosing plant 12-3 by the 3rd constant flow pump 13-3, oxidation pond 18 is connected with oxygenant chemicals dosing plant 12-4 by the 4th constant flow pump 13-4, equipment for separating liquid from solid 6 comprises the strainer 6-1 and double filtering equipment 6-2 that are connected successively by pipeline, coarse filtration equipment 6-1 is all connected with sludge pump 10-3 with double filtering equipment 6-2 by the 4th valve 9-4, sludge pump 10-3 is connected with sludge dewatering equipment 16.
Principle of work of the present invention: when row pressure power of the returning liquid that shale gas well frac job produces utilizes process again, be stored in wastewater disposal basin 1, through equalizing tank 2, the pH value returning row pressure power liquid is regulated by adding conditioning agent, after process, and further by rapid stirring pond 14, by carrying out setting the amount adding flocculant poly aluminum chloride according to returning row pressure power liquid process volume, the dosage of agitator 17 rotating speed and flocculation agent, the agitator 17 be simultaneously positioned at bottom rapid stirring pond 14 fully stirs when adding flocculation agent, low rate mixing pond 15 is entered after rapid stirring pond 14 processes, while inherence, low rate mixing pond 15 adds coagulant aids, the agitator 17 being positioned at bottom starts to stir, realize the abundant reaction returning row pressure power liquid and coagulant aids, and connect rapid stirring pond 14, the pipeline in low rate mixing pond 15 is that pipeline one end is deeply in rapid stirring pond 14, and be positioned at the top in rapid stirring pond 14, the pipeline that low rate mixing pond 15 is connected with oxidation pond 18, pipeline one end is deeply in low rate mixing pond 15, and be positioned at the top in low rate mixing pond 15, after the process in low rate mixing pond 15, returning row pressure power liquid enters in oxidation pond 18, add in oxidation pond by oxygenant chemicals dosing plant 12-4, limit edged stirs, then settling bowl 5 is entered, leave standstill, enter equipment for separating liquid from solid 6 to be further processed returning row pressure power liquid, realize solid-liquid separation, coarse filtration equipment is entered successively in equipment for separating liquid from solid 6, the suspended substance larger to particle diameter, process, after coarse filtration equipment 6-1 process, enter double filtering equipment 6-2 process, heavy metal ion content in row pressure power liquid is returned in further reduction, suspension content etc., after equipment for separating liquid from solid 6 processes, enter clean solution tank 7, now return suspended substance in row pressure power liquid, COD, heavy metal ion equal size reaches cleanup standard, can be used for preparing fracturing fluid system, meet pressing crack construction requirement.
Embodiment 2:
The present embodiment limits further on the basis of embodiment 1, described equalizing tank 2 is connected with rapid stirring pond 14 by the first valve 9-1, equalizing tank 2 by the second valve 9-2 successively with electric flocculation reaction device 4, filtering basin 20 connect, filtering basin 20 respectively with rapid stirring pond 14, settling bowl 5 connects, the 3rd valve 9-3 is provided with between filtering basin 20 and settling bowl 5, detect as required and return suspended substance in row pressure power liquid, COD, the content of heavy metal ion etc., by carrying out electric flocculation reaction, after filtration, enter again in complex coagulation reaction unit 3 and enter process, can realize effectively reducing returning suspended substance in row pressure power liquid, COD, the content of heavy metal ion etc.Other structures of the present embodiment are identical with embodiment 1, repeat no more.
Embodiment 3:
The present embodiment limits further on the basis of above-described embodiment, is provided with the first thief hole 8-1, the first lift pump 10-1 and under meter 11 between described wastewater disposal basin 1 and equalizing tank 2 successively.By the setting of the first thief hole 8-1, mainly row pressure power of the returning liquid in wastewater disposal basin is sampled, and its composition is analyzed, to determine follow-up treatment scheme; By the setting of the first lift pump 10-1, mainly by the first lift pump 10-1 row pressure power of the returning liquid in wastewater disposal basin is delivered in equalizing tank 2 and processes, can according to the treatment capacity returning device in row pressure power liquid treatment scheme by under meter 11, the setting unit time is interior to the treatment capacity returning row pressure power liquid; Be provided with the second lift pump 10-2, the 4th thief hole 8-4 between described settling bowl 5 and equipment for separating liquid from solid 6, other structures of the present embodiment are same as the previously described embodiments, repeat no more.
Embodiment 4:
The present embodiment is on the basis of above-described embodiment, further restriction, described 4th lift pump 10-2 is all connected with coarse filtration equipment 6-1, double filtering equipment 6-2 by one article of pipeline, be provided with the 5th valve 9-5 between 4th lift pump 10-2 and coarse filtration equipment 6-1, between the 4th lift pump 10-2 and double filtering equipment 6-2, be provided with the 6th valve 9-6.Can according to the sampling analysis result returning row pressure power liquid in settling bowl 5, determine whether treatment scheme all needs the process by coarse filtration equipment 6-1 and double filtering equipment 6-2, realize the Appropriate application to process unit, and while raising processing efficiency, ensure the treatment effect to returning row pressure power liquid.Other structures of the present embodiment are same as the previously described embodiments, repeat no more.
Embodiment 5:
The present embodiment is on the basis of above-described embodiment, further restriction, the second thief hole 8-2 is provided with between described electric flocculation reaction device 4 and filtering basin 20, by the setting of the second thief hole, realize being further analyzed row pressure power of the returning liquid after electric flocculation reaction device 4 processes, to determine follow-up treatment scheme.Other structures of the present embodiment are same as the previously described embodiments, repeat no more.
Embodiment 6:
The present embodiment is on the basis of above-described embodiment, the bottom of the described settling bowl 5 of further restriction is connected with sedimentator 19, described sedimentator 19 mainly carries out centrifugal to the waste residue bottom settling bowl 5, the upper strata treatment solution of centrifugal rear sedimentator 19 can enter in filtering basin 20 and proceed process, and sedimentator discharged by a small amount of waste residue.Other structures of embodiment are same as the previously described embodiments, repeat no more.
Embodiment 7:
The present embodiment is on the basis of above-described embodiment, further restriction, the 5th thief hole 8-5, the 4th valve 9-4 is provided with between described sludge pump 10-3 and coarse filtration equipment 6-1, the 6th thief hole 8-6 is provided with between described sludge pump 10-3 and double filtering equipment 6-2, by the setting of the 5th thief hole 8-5 and the 6th thief hole 8-6, the treatment effect realizing returning coarse filtration equipment 6-1, double filtering equipment 6-2 process row pressure power liquid is monitored.Other structures of the present embodiment are same as the previously described embodiments, repeat no more.
Embodiment 8:
The present embodiment is on the basis of above-described embodiment, and limiting described flocculation agent chemicals dosing plant 12-2 is further polymerize aluminum chloride chemicals dosing plant, and described coagulant aids chemicals dosing plant 12-3 is active silicic acid chemicals dosing plant.Other structures of the present embodiment are same as the previously described embodiments, repeat no more.
The above is only preferred embodiment of the present invention, and not do any pro forma restriction to the present invention, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present invention, all falls into protection scope of the present invention.

Claims (10)

1. one kind is returned the recycling treatment unit of row pressure power liquid for shale gas well frac job, it is characterized in that: comprise the wastewater disposal basin (1) connected in turn by pipeline, equalizing tank (2), complex coagulation reaction unit (3), settling bowl (5), equipment for separating liquid from solid (6) and clean water basin (7), complex coagulation reaction unit (3) comprises the rapid stirring pond (14) connected successively by pipeline, low rate mixing pond (15) and oxidation pond (18), equalizing tank (2) upper end is connected with conditioning agent chemicals dosing plant (12-1) by the first constant flow pump (13-1), rapid stirring pond (14) is connected with flocculation agent chemicals dosing plant (12-2) by the second constant flow pump (13-2), low rate mixing pond (15) is connected with coagulant aids chemicals dosing plant (12-3) by the 3rd constant flow pump (13-3), oxidation pond (18) is connected with oxygenant chemicals dosing plant (12-4) by the 4th constant flow pump (13-4), equipment for separating liquid from solid (6) comprises the strainer (6-1) and double filtering equipment (6-2) that are connected successively by pipeline, coarse filtration equipment (6-1) is all connected with sludge pump (10-3) with double filtering equipment (6-2) by the 4th valve (9-4), sludge pump (10-3) is connected with sludge dewatering equipment (16), described equalizing tank (2), rapid stirring pond (14), low rate mixing pond (15), the bottom of oxidation pond (18) is equipped with agitator (17).
2. a kind of recycling treatment unit returning row pressure power liquid for shale gas well frac job according to claim 1, it is characterized in that: described equalizing tank (2) is connected with rapid stirring pond (14) by the first valve (9-1), equalizing tank (2) is connected with electric flocculation reaction device (4), filtering basin (20) successively by the second valve (9-2), filtering basin (20) are connected with rapid stirring pond (14), settling bowl (5) respectively, are provided with the 3rd valve (9-3) between filtering basin (20) and settling bowl (5).
3. a kind of recycling treatment unit returning row pressure power liquid for shale gas well frac job according to claim 2, is characterized in that: be provided with the first thief hole (8-1), the first lift pump (10-1) and under meter (11) between described wastewater disposal basin (1) and equalizing tank (2) successively.
4. a kind of recycling treatment unit returning row pressure power liquid for shale gas well frac job according to claim 3, is characterized in that: be provided with the second lift pump (10-2), the 4th thief hole (8-4) between described settling bowl (5) and equipment for separating liquid from solid (6).
5. a kind of recycling treatment unit returning row pressure power liquid for shale gas well frac job according to any one of claim 2 to 4, it is characterized in that: described 4th lift pump (10-2) is all connected with coarse filtration equipment (6-1), double filtering equipment (6-2) by one article of pipeline, be provided with the 5th valve (9-5) between 4th lift pump (10-2) and coarse filtration equipment (6-1), between the 4th lift pump (10-2) and double filtering equipment (6-2), be provided with the 6th valve (9-6).
6. a kind of recycling treatment unit returning row pressure power liquid for shale gas well frac job according to claim 5, is characterized in that: be provided with the second thief hole (8-2) between described electric flocculation reaction device (4) and filtering basin (20).
7. a kind of recycling treatment unit returning row pressure power liquid for shale gas well frac job according to claim 6, is characterized in that: the bottom of described settling bowl (19) is connected with sedimentator (19).
8. a kind of recycling treatment unit returning row pressure power liquid for shale gas well frac job according to claim 7, it is characterized in that: be provided with the 5th thief hole (8-5), the 4th valve (9-4) between described sludge pump (10-3) and coarse filtration equipment (6-1), between described sludge pump (10-3) and double filtering equipment (6-2), be provided with the 6th thief hole (8-6).
9. a kind of recycling treatment unit returning row pressure power liquid for shale gas well frac job according to claim 8, is characterized in that: described flocculation agent chemicals dosing plant (12-2) is polymerize aluminum chloride chemicals dosing plant.
10. a kind of recycling treatment unit returning row pressure power liquid for shale gas well frac job according to claim 8, is characterized in that: described coagulant aids chemicals dosing plant (12-3) is active silicic acid chemicals dosing plant.
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CN104909500A (en) * 2015-06-10 2015-09-16 常州大学 Device for removing high-concentration polyving alcohol in wastewater
CN104909500B (en) * 2015-06-10 2017-07-14 常州大学 A kind of removal device of Coal Gas Washing Cycling Water polyvinyl alcohol
CN106315903A (en) * 2015-06-15 2017-01-11 中石化石油工程技术服务有限公司 Method for processing shale gas fracturing flowback fluid

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