CN113582463A - Direct-discharge treatment method for high-salinity fracturing flowback fluid - Google Patents
Direct-discharge treatment method for high-salinity fracturing flowback fluid Download PDFInfo
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 14
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000000945 filler Substances 0.000 claims description 14
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- 235000003891 ferrous sulphate Nutrition 0.000 claims description 12
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 12
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 12
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 9
- 229910052717 sulfur Inorganic materials 0.000 claims description 9
- 239000011593 sulfur Substances 0.000 claims description 9
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- 229910021389 graphene Inorganic materials 0.000 claims description 7
- 239000010802 sludge Substances 0.000 claims description 7
- 239000011787 zinc oxide Substances 0.000 claims description 7
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- 238000007599 discharging Methods 0.000 claims description 4
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- 239000000463 material Substances 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 3
- 238000005188 flotation Methods 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- 235000010265 sodium sulphite Nutrition 0.000 claims description 3
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 2
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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Abstract
一种高矿化度压裂返排液的直排处理方法，涉及油田污水处理技术领域。本发明的目的是为了解决目前采用单一方法处理压裂返排液存在处理效果差、易造成二次污染以及处理成本高的问题。方法：将压裂返排液依次进行电催化氧化处理，得到电催化氧化处理后的压裂返排液，进行BESI生物处理，得到BESI生物处理后的压裂返排液，然后投加压裂液消解剂，反应得到加药处理后的压裂返排液；再进行臭氧催化氧化，得到臭氧催化氧化后的压裂返排液，臭氧催化氧化时，添加双氧水和硅铝载体臭氧催化填料，最后将臭氧催化氧化后的压裂返排液进行两级过滤，完成高矿化度压裂返排液的直排处理。本发明可获得一种高矿化度压裂返排液的直排处理方法。
The invention discloses a direct discharge treatment method for high salinity fracturing flowback fluid, which relates to the technical field of oilfield sewage treatment. The purpose of the present invention is to solve the problems of poor treatment effect, easy secondary pollution and high treatment cost when a single method is used to treat fracturing flowback fluid. Method: The fracturing flowback fluid is subjected to electrocatalytic oxidation treatment in sequence to obtain the fracturing flowback fluid after electrocatalytic oxidation treatment, and then BESI biological treatment is performed to obtain the fracturing flowback fluid after BESI biological treatment, and then the fracturing flowback fluid after the BESI biological treatment is obtained. The liquid digestion agent is reacted to obtain the fracturing flowback fluid after the dosing treatment; then ozone catalytic oxidation is carried out to obtain the fracturing flowback fluid after the ozone catalytic oxidation. Finally, the fracturing flowback fluid after ozone catalytic oxidation is subjected to two-stage filtration to complete the direct discharge treatment of the high-salinity fracturing flowback fluid. The present invention can obtain a direct discharge treatment method for high salinity fracturing flowback fluid.
Description
Technical Field
The invention relates to the technical field of oilfield sewage treatment, in particular to a direct discharge treatment method of high-salinity fracturing flow-back fluid.
Background
At present, many oil fields in China are oil and gas reservoirs with low porosity and low permeability, and fracturing operation is an important measure for increasing the yield of low permeability oil fields. The fracturing flow-back fluid is waste liquid which returns to the ground after fracturing operation is finished, and is one of main pollution sources of oilfield water body pollution. Because a plurality of chemical additives are added in the fracturing process, the fracturing flow-back fluid has complex components and has the characteristics of high viscosity, high COD, high oil content, high chroma, high suspended solid content and the like, and if the waste liquid cannot be effectively treated, the waste liquid can cause serious pollution to water bodies and other environments.
At present, methods for treating fracturing flowback fluid in oil fields at home and abroad comprise a solidification method, a micro-electrolysis method, a biological method, a chemical oxidation method, a chemical coagulation method and the like, and if one method is independently adopted for treating the fracturing flowback fluid, the method has great limitations, such as poor treatment effect, easy generation of secondary pollution, high treatment cost and the like.
Disclosure of Invention
The invention aims to solve the problems of poor treatment effect, easy secondary pollution and high treatment cost of the conventional single method for treating the fracturing flow-back fluid, and provides a direct-discharge treatment method for the high-salinity fracturing flow-back fluid.
A direct-discharge treatment method of high-salinity fracturing flowback fluid comprises the following steps:
sequentially carrying out primary electrocatalytic oxidation treatment and secondary electrocatalytic oxidation treatment on the fracturing flow-back fluid to obtain fracturing flow-back fluid after electrocatalytic oxidation treatment, carrying out BESI biological treatment on the fracturing flow-back fluid after electrocatalytic oxidation treatment to obtain fracturing flow-back fluid after BESI biological treatment, then adding a fracturing fluid digesting agent into the fracturing flow-back fluid after BESI biological treatment, and reacting for 20-50 min to obtain fracturing flow-back fluid after dosing treatment, wherein the adding amount of the fracturing fluid digesting agent is 10-40 mg/L; carrying out ozone catalytic oxidation on the fracturing flow-back fluid subjected to the chemical adding treatment for 20-40 min to obtain a fracturing flow-back fluid subjected to ozone catalytic oxidation, wherein hydrogen peroxide and a silicon-aluminum carrier ozone catalytic filler are added during ozone catalytic oxidation, the adding amount of the hydrogen peroxide is 0.5L/t, and the adding amount of the silicon-aluminum carrier ozone catalytic filler is 1/2-2/3 of the volume of the ozone catalytic oxidation tank; finally, performing two-stage filtration on the fracturing flow-back fluid subjected to catalytic oxidation by ozone to complete the direct discharge treatment of the high-salinity fracturing flow-back fluid; the BESI biological treatment comprises the following steps: adding the fracturing flow-back fluid after electrocatalytic oxidation treatment into a bioreactor consisting of an anaerobic zone, an anoxic zone and an aerobic zone, and adding a sulfur electron acceptor for biological treatment; when BESI biological treatment is carried out, nano zinc oxide, nano graphene or nano lignocellulose are added into the anaerobic sludge, and the addition amount is 0.1 g/kg.
The invention has the beneficial effects that:
(1) the invention relates to a direct-discharge treatment method of high-salinity fracturing flow-back fluid, which is characterized in that the following innovation points are added on the basis of the traditional method for treating the fracturing flow-back fluid in an oil field:
1) in the BESI biotechnology, nano zinc oxide, nano graphene or nano lignocellulose are added into anaerobic sludge, and the addition amount is 0.1g/kg, so that the biological treatment efficiency is improved.
2) And adding a fracturing fluid digesting agent into the fracturing flow-back fluid after the BESI biological treatment, wherein the fracturing fluid digesting agent is sodium hypochlorite or hypochlorous acid, and the adding amount is 20mg/L, and is used for treating the rest fracturing fluid components.
3) During catalytic oxidation of ozone, hydrogen peroxide and a silicon-aluminum carrier ozone catalytic filler are added, wherein the adding amount of the hydrogen peroxide is 0.5L/t, and the adding amount of the silicon-aluminum carrier ozone catalytic filler is 1/2-2/3 of the volume of the ozone catalytic oxidation tank; after adding hydrogen peroxide, ferrous sulfate can be added, and the molar ratio of the hydrogen peroxide to the ferrous sulfate is (1-2): 1.
4) the sewage treated by the direct discharge treatment method can reach the first-level A standard or the first-level B standard and completely meet the standard of direct discharge.
(2) The invention relates to a direct discharge treatment method of high-salinity fracturing flow-back fluid, which treats the fracturing flow-back fluid by combining biological treatment, chemical oxidation and physical filtration, firstly destroys macromolecular organic matters by adopting electrocatalytic oxidation, simultaneously carries out air flotation oil removal and recovery, then carries out BESI biological treatment to degrade the organic matters in the fracturing flow-back fluid, carries out ozone catalytic oxidation treatment to further oxidize the organic matters in the fracturing flow-back fluid, simultaneously has the functions of removing chromaticity and smell, then utilizes a fracturing flow digestion agent to treat residual fracturing flow-back fluid components, and finally removes solid particles in the fracturing flow-back fluid by a two-stage filtration device, so that the COD content in the final effluent is less than 50mg/L, meets the first-stage A discharge standard, and is discharged into a natural water body. The method can simultaneously realize oil recovery and water treatment of the fracturing flow-back fluid, effectively reduce the storage and transportation expenses of the fracturing flow-back fluid, and solve the problems of poor treatment effect, easy secondary pollution and high treatment cost of the existing single method for treating the fracturing flow-back fluid.
(3) The invention adopts a combined process to treat the fracturing flow-back fluid, can fully exert the advantages of each unit, effectively remove harmful substances in the fracturing flow-back fluid, realize the harmless treatment of the fracturing flow-back fluid and protect water resources and water environment.
The invention can obtain a direct-discharge treatment method of the high-salinity fracturing flow-back fluid.
Drawings
Fig. 1 is a process flow diagram of a direct discharge treatment method of a highly mineralized fracturing flow-back fluid according to the invention.
Detailed Description
The first embodiment is as follows: the embodiment of the invention relates to a direct-discharge treatment method of high-salinity fracturing flowback fluid, which comprises the following steps of:
sequentially carrying out primary electrocatalytic oxidation treatment and secondary electrocatalytic oxidation treatment on the fracturing flow-back fluid to obtain fracturing flow-back fluid after electrocatalytic oxidation treatment, carrying out BESI biological treatment on the fracturing flow-back fluid after electrocatalytic oxidation treatment to obtain fracturing flow-back fluid after BESI biological treatment, then adding a fracturing fluid digesting agent into the fracturing flow-back fluid after BESI biological treatment, and reacting for 20-50 min to obtain fracturing flow-back fluid after dosing treatment, wherein the adding amount of the fracturing fluid digesting agent is 10-40 mg/L; carrying out ozone catalytic oxidation on the fracturing flow-back fluid subjected to the chemical adding treatment for 20-40 min to obtain a fracturing flow-back fluid subjected to ozone catalytic oxidation, wherein hydrogen peroxide and a silicon-aluminum carrier ozone catalytic filler are added during ozone catalytic oxidation, the adding amount of the hydrogen peroxide is 0.5L/t, and the adding amount of the silicon-aluminum carrier ozone catalytic filler is 1/2-2/3 of the volume of the ozone catalytic oxidation tank; finally, performing two-stage filtration on the fracturing flow-back fluid subjected to catalytic oxidation by ozone to complete the direct discharge treatment of the high-salinity fracturing flow-back fluid; the BESI biological treatment comprises the following steps: adding the fracturing flow-back fluid after electrocatalytic oxidation treatment into a bioreactor consisting of an anaerobic zone, an anoxic zone and an aerobic zone, and adding a sulfur electron acceptor for biological treatment; when BESI biological treatment is carried out, nano zinc oxide, nano graphene or nano lignocellulose are added into the anaerobic sludge, and the addition amount is 0.1 g/kg.
The beneficial effects of the embodiment are as follows:
(1) the embodiment of the direct-discharge treatment method for the high-salinity fracturing flow-back fluid adds the following innovation points on the basis of the traditional method for treating the fracturing flow-back fluid in the oil field:
1) in the BESI biotechnology, nano zinc oxide, nano graphene or nano lignocellulose are added into anaerobic sludge, and the addition amount is 0.1g/kg, so that the biological treatment efficiency is improved.
2) And adding a fracturing fluid digesting agent into the fracturing flow-back fluid after the BESI biological treatment, wherein the fracturing fluid digesting agent is sodium hypochlorite or hypochlorous acid, and the adding amount is 20mg/L, and is used for treating the rest fracturing fluid components.
3) During catalytic oxidation of ozone, hydrogen peroxide and a silicon-aluminum carrier ozone catalytic filler are added, wherein the adding amount of the hydrogen peroxide is 0.5L/t, and the adding amount of the silicon-aluminum carrier ozone catalytic filler is 1/2-2/3 of the volume of the ozone catalytic oxidation tank; after adding hydrogen peroxide, ferrous sulfate can be added, and the molar ratio of the hydrogen peroxide to the ferrous sulfate is (1-2): 1.
4) the sewage treated by the direct discharge treatment method can reach the first-level A standard or the first-level B standard and completely meet the standard of direct discharge.
(2) The embodiment provides a direct discharge treatment method of high-salinity fracturing flow-back fluid, which adopts a biological treatment and chemical oxidation and physical filtration combined mode to treat the fracturing flow-back fluid, firstly adopts electrocatalytic oxidation to destroy macromolecular organic matters, simultaneously carries out air flotation oil removal and recovery, then carries out BESI biological treatment to degrade the organic matters therein, carries out ozone catalytic oxidation treatment to further oxidize the organic matters therein, and has the effects of removing chromaticity and smell, and then utilizes a fracturing fluid digesting agent to treat residual fracturing fluid components, and finally removes solid particles therein through a two-stage filtering device, so that the COD content in the final outlet water is less than 50mg/L, meets the first-stage A discharge standard, and is discharged into a natural water body. The embodiment can realize oil recovery and water treatment of the fracturing flow-back fluid at the same time, effectively reduce storage and transportation expenses of the fracturing flow-back fluid, and solve the problems of poor treatment effect, easiness in causing secondary pollution and high treatment cost in the conventional single method for treating the fracturing flow-back fluid.
(3) The treatment of the fracturing flow-back fluid by the embodiment adopts a combined process, so that the advantages of each unit can be fully exerted, harmful substances in the fracturing flow-back fluid are effectively removed, the harmless treatment of the fracturing flow-back fluid is realized, and water resources and water environment are protected.
The second embodiment is as follows: the present embodiment differs from the present embodiment in that: and when the fracturing flow-back fluid is subjected to primary electrocatalytic oxidation treatment and secondary electrocatalytic oxidation treatment, simultaneously performing air floatation treatment and removing oil drops rising to the liquid level of the fracturing flow-back fluid.
Other steps are the same as those in the first embodiment.
The third concrete implementation mode: the first or second differences from the present embodiment are as follows: the sulfur electron acceptor is sodium sulfate, sodium sulfite or sodium thiosulfate.
The other steps are the same as those in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment and one of the first to third embodiments is as follows: and adding a fracturing fluid digesting agent into the fracturing flow-back fluid after the BESI biological treatment, and reacting for 30 min.
The other steps are the same as those in the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the fracturing fluid digesting agent is sodium hypochlorite or hypochlorous acid, and the adding amount is 20 mg/L.
The other steps are the same as those in the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is as follows: carrying out ozone catalytic oxidation on the fracturing flow-back fluid after the chemical treatment for 30min to obtain the fracturing flow-back fluid after the ozone catalytic oxidation, wherein the concentration of ozone is 30-40 mg/L; during catalytic oxidation of ozone, adding hydrogen peroxide and then adding ferrous sulfate, wherein the molar ratio of the hydrogen peroxide to the ferrous sulfate is (1-2): 1.
the other steps are the same as those in the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: the two-stage filtration is the filtration sequentially passing through a first-stage filter and a second-stage filter.
The other steps are the same as those in the first to sixth embodiments.
The specific implementation mode is eight: the difference between this embodiment and one of the first to seventh embodiments is: the first-stage filter is a double-filter-material filter.
The other steps are the same as those in the first to seventh embodiments.
The specific implementation method nine: the difference between this embodiment and the first to eighth embodiments is: the secondary filter is an activated carbon filter.
The other steps are the same as those in the first to eighth embodiments.
The detailed implementation mode is ten: the difference between this embodiment and one of the first to ninth embodiments is as follows: and the COD of the effluent of the hypersalinity fracturing flow-back fluid after the direct discharge treatment is less than 50 mg/L.
The other steps are the same as those in the first to ninth embodiments.
The following examples were used to demonstrate the beneficial effects of the present invention:
example 1: a direct-discharge treatment method of high-salinity fracturing flowback fluid comprises the following steps:
the fracturing flow-back fluid is sequentially subjected to primary electrocatalytic oxidation treatment and secondary electrocatalytic oxidation treatment, and a strong-oxidizing intermediate product generated by electrocatalytic oxidation can destroy and change macromolecular organic matters in the fracturing flow-back fluid, so that the macromolecular organic matters are degraded into micromolecular organic matters, and a guarantee is provided for a subsequent biological treatment process; simultaneously carrying out air floatation treatment, scraping oil drops rising to the liquid level of the fracturing flow-back fluid by using a scraper to obtain the fracturing flow-back fluid after electrocatalytic oxidation treatment, carrying out BESI biological treatment on the fracturing flow-back fluid after electrocatalytic oxidation treatment to obtain the fracturing flow-back fluid after BESI biological treatment, and adding nano zinc oxide, nano graphene or nano lignocellulose into anaerobic sludge in an amount of 0.1g/kg when the BESI biological treatment is carried out; then adding a fracturing fluid digesting agent sodium hypochlorite into the fracturing flow-back fluid after the BESI biological treatment to further treat the rest fracturing fluid components, and reacting for 30min to obtain the fracturing flow-back fluid after the medicine adding treatment, wherein the adding amount of the sodium hypochlorite is 20 mg/L; carrying out ozone catalytic oxidation on the fracturing flow-back fluid after the chemical treatment for 30min, and carrying out ozone catalytic oxidation on the fracturing flow-back fluid after the chemical treatment for 30min to obtain the fracturing flow-back fluid after the ozone catalytic oxidation, wherein the concentration of ozone is 30mg/L, and the ozone has strong oxidizability, can further oxidize the fracturing flow-back fluid, and simultaneously plays a role in removing chromaticity and smell; during catalytic oxidation of ozone, hydrogen peroxide and a silicon-aluminum carrier ozone catalytic filler are added, the adding amount of the hydrogen peroxide is 0.5L/t, the adding amount of the silicon-aluminum carrier ozone catalytic filler is 1/2-2/3 of the volume of the ozone catalytic oxidation tank, ferrous sulfate is added after the hydrogen peroxide is added, and the molar ratio of the hydrogen peroxide to the ferrous sulfate is (1-2): 1. finally, filtering the fracturing flow-back fluid subjected to catalytic oxidation by ozone through a primary filter and a secondary filter in sequence, removing solid particles in the fracturing flow-back fluid, discharging effluent into a natural water body, and finishing the direct discharge treatment of the high-salinity fracturing flow-back fluid; the BESI biological treatment comprises the following steps: adding the fracturing flow-back fluid after electrocatalytic oxidation treatment into a bioreactor consisting of an anaerobic zone, an anoxic zone and an aerobic zone, adding sulfur electron acceptor sodium sulfate for biological treatment, and degrading organic matters in the fracturing flow-back fluid by utilizing the sulfur metabolism of microorganisms; the first-stage filter is a double-filter-material filter, and the second-stage filter is an activated carbon filter.
Table 1 shows the COD content before and after the treatment of the following frac flowback fluid 1 (raw water), frac flowback fluid 2 (raw water), and mixed water (frac flowback fluid 1+ frac flowback fluid 2) by the in-line treatment method of this example.
TABLE 1
The COD of the effluent of the hypersalinity fracturing flow-back fluid after the direct discharge treatment is finished by the embodiment is less than 50mg/L, and meets the discharge standard of first-class A.
Example 2: a direct-discharge treatment method of high-salinity fracturing flowback fluid comprises the following steps:
the fracturing flow-back fluid is sequentially subjected to primary electrocatalytic oxidation treatment and secondary electrocatalytic oxidation treatment, and a strong-oxidizing intermediate product generated by electrocatalytic oxidation can destroy and change macromolecular organic matters in the fracturing flow-back fluid, so that the macromolecular organic matters are degraded into micromolecular organic matters, and a guarantee is provided for a subsequent biological treatment process; simultaneously carrying out air floatation treatment, scraping oil drops rising to the liquid level of the fracturing flow-back fluid by using a scraper to obtain the fracturing flow-back fluid after electrocatalytic oxidation treatment, carrying out BESI biological treatment on the fracturing flow-back fluid after electrocatalytic oxidation treatment to obtain the fracturing flow-back fluid after BESI biological treatment, and adding nano zinc oxide, nano graphene or nano lignocellulose into anaerobic sludge in an amount of 0.1g/kg when the BESI biological treatment is carried out; then adding a fracturing fluid digesting agent sodium hypochlorite into the fracturing flow-back fluid after the BESI biological treatment to further treat the rest fracturing fluid components, and reacting for 40min to obtain the fracturing flow-back fluid after the medicine adding treatment, wherein the adding amount of the sodium hypochlorite is 40 mg/L; and then carrying out ozone catalytic oxidation on the fracturing flow-back fluid subjected to the chemical adding treatment for 40min, carrying out ozone catalytic oxidation on the fracturing flow-back fluid subjected to the chemical adding treatment for 30min to obtain a fracturing flow-back fluid subjected to the ozone catalytic oxidation, wherein the concentration of ozone is 40mg/L, the ozone has strong oxidizability, the fracturing flow-back fluid can be further oxidized, and the effect of removing chromaticity and smell is achieved at the same time, during the ozone catalytic oxidation, hydrogen peroxide and silicon-aluminum carrier ozone catalytic filler are added, the adding amount of the hydrogen peroxide is 0.5L/t, the adding amount of the silicon-aluminum carrier ozone catalytic filler is 1/2-2/3 of the volume of an ozone catalytic oxidation tank, ferrous sulfate is further added after the hydrogen peroxide is added, and the molar ratio of the hydrogen peroxide to the ferrous sulfate is (1-2): 1. finally, filtering the fracturing flow-back fluid subjected to catalytic oxidation by ozone through a primary filter and a secondary filter in sequence, removing solid particles in the fracturing flow-back fluid, discharging effluent into a natural water body, and finishing the direct discharge treatment of the high-salinity fracturing flow-back fluid; the BESI biological treatment comprises the following steps: adding the fracturing flow-back fluid after electrocatalytic oxidation treatment into a bioreactor consisting of an anaerobic zone, an anoxic zone and an aerobic zone, adding sodium sulfite as a sulfur electron acceptor for biological treatment, and degrading organic matters in the fracturing flow-back fluid by utilizing the sulfur metabolism of microorganisms; the first-stage filter is a double-filter-material filter, and the second-stage filter is an activated carbon filter.
Table 2 shows the COD content before and after the treatment of the following frac flowback fluid 1 (raw water), frac flowback fluid 2 (raw water), and mixed water (frac flowback fluid 1+ frac flowback fluid 2) by the in-line treatment method of this example.
TABLE 2
Table 3 shows the water quality before treatment of the fracturing flow-back fluid 1 (raw water), the fracturing flow-back fluid 2 (raw water) and the mixed water (fracturing flow-back fluid 1+ fracturing flow-back fluid 2).
TABLE 3
Claims (10)
1. A direct-discharge treatment method of high-salinity fracturing flowback fluid is characterized by comprising the following steps of:
sequentially carrying out primary electrocatalytic oxidation treatment and secondary electrocatalytic oxidation treatment on the fracturing flow-back fluid to obtain fracturing flow-back fluid after electrocatalytic oxidation treatment, carrying out BESI biological treatment on the fracturing flow-back fluid after electrocatalytic oxidation treatment to obtain fracturing flow-back fluid after BESI biological treatment, then adding a fracturing fluid digesting agent into the fracturing flow-back fluid after BESI biological treatment, and reacting for 20-50 min to obtain fracturing flow-back fluid after dosing treatment, wherein the adding amount of the fracturing fluid digesting agent is 10-40 mg/L; carrying out ozone catalytic oxidation on the fracturing flow-back fluid subjected to the chemical adding treatment for 20-40 min to obtain a fracturing flow-back fluid subjected to ozone catalytic oxidation, wherein hydrogen peroxide and a silicon-aluminum carrier ozone catalytic filler are added during ozone catalytic oxidation, the adding amount of the hydrogen peroxide is 0.5L/t, and the adding amount of the silicon-aluminum carrier ozone catalytic filler is 1/2-2/3 of the volume of the ozone catalytic oxidation tank; finally, performing two-stage filtration on the fracturing flow-back fluid subjected to catalytic oxidation by ozone to complete the direct discharge treatment of the high-salinity fracturing flow-back fluid; the BESI biological treatment comprises the following steps: adding the fracturing flow-back fluid after electrocatalytic oxidation treatment into a bioreactor consisting of an anaerobic zone, an anoxic zone and an aerobic zone, and adding a sulfur electron acceptor for biological treatment; when BESI biological treatment is carried out, nano zinc oxide, nano graphene or nano lignocellulose are added into the anaerobic sludge, and the addition amount is 0.1 g/kg.
2. The method for directly discharging the highly mineralized fracturing flow-back fluid according to claim 1, wherein when the first electro-catalytic oxidation treatment and the second electro-catalytic oxidation treatment are performed on the fracturing flow-back fluid, an air flotation treatment is performed simultaneously, and oil drops rising to the liquid level of the fracturing flow-back fluid are removed.
3. The method of claim 1, wherein the sulfur electron acceptor is sodium sulfate, sodium sulfite, or sodium thiosulfate.
4. The method for the in-line treatment of the highly mineralized fracturing flow-back fluid according to claim 1, wherein a fracturing fluid digesting agent is added into the fracturing flow-back fluid after the BESI biological treatment, and the reaction is carried out for 30 min.
5. The in-line treatment method of the highly mineralized fracturing flow-back fluid according to claim 1 or 4, characterized in that the fracturing fluid digesting agent is sodium hypochlorite or hypochlorous acid, and the adding amount is 20 mg/L.
6. The method for directly discharging the highly mineralized fracturing flow-back fluid according to claim 1, wherein the fracturing flow-back fluid after being treated by adding the chemicals is subjected to ozone catalytic oxidation for 30min to obtain the fracturing flow-back fluid after being subjected to ozone catalytic oxidation, wherein the concentration of the ozone is 30-40 mg/L; during catalytic oxidation of ozone, adding hydrogen peroxide and then adding ferrous sulfate, wherein the molar ratio of the hydrogen peroxide to the ferrous sulfate is (1-2): 1.
7. the method for the in-line treatment of the hypersalinity fracturing flow-back fluid according to claim 1, characterized in that the two-stage filtration is a filtration sequentially passing through a first-stage filter and a second-stage filter.
8. The method for the in-line treatment of the hypersalinity fracturing flowback fluid of claim 7, wherein the primary filter is a dual filter material filter.
9. The method for the in-line treatment of the hypersalinity fracturing flowback fluid according to claim 7, characterized in that the secondary filter is an activated carbon filter.
10. The method for the in-line treatment of the hypersalinity fracturing flow-back fluid according to claim 1, wherein the COD of the effluent of the hypersalinity fracturing flow-back fluid after the in-line treatment is less than 50 mg/L.
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