CN115215413A - Pretreatment method for polymer-containing wastewater - Google Patents
Pretreatment method for polymer-containing wastewater Download PDFInfo
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- CN115215413A CN115215413A CN202210645838.0A CN202210645838A CN115215413A CN 115215413 A CN115215413 A CN 115215413A CN 202210645838 A CN202210645838 A CN 202210645838A CN 115215413 A CN115215413 A CN 115215413A
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- 229920000642 polymer Polymers 0.000 title claims abstract description 49
- 239000002351 wastewater Substances 0.000 title claims abstract description 46
- 238000002203 pretreatment Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 38
- 238000000926 separation method Methods 0.000 claims abstract description 29
- 238000005188 flotation Methods 0.000 claims abstract description 9
- 238000003487 electrochemical reaction Methods 0.000 claims abstract description 7
- 239000010865 sewage Substances 0.000 claims abstract description 5
- 230000014759 maintenance of location Effects 0.000 claims description 10
- 230000000630 rising effect Effects 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 239000010936 titanium Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052741 iridium Inorganic materials 0.000 claims description 2
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 2
- 238000004886 process control Methods 0.000 claims 1
- 238000011272 standard treatment Methods 0.000 abstract description 3
- 230000006378 damage Effects 0.000 abstract description 2
- 238000005345 coagulation Methods 0.000 abstract 1
- 230000015271 coagulation Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 22
- 230000000694 effects Effects 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- YADSGOSSYOOKMP-UHFFFAOYSA-N dioxolead Chemical compound O=[Pb]=O YADSGOSSYOOKMP-UHFFFAOYSA-N 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 239000013543 active substance Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 238000012668 chain scission Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- HTXDPTMKBJXEOW-UHFFFAOYSA-N dioxoiridium Chemical compound O=[Ir]=O HTXDPTMKBJXEOW-UHFFFAOYSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910000457 iridium oxide Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a pretreatment method of polymer-containing wastewater, which comprises the following steps: introducing the polymer-containing wastewater into an electrochemical device for electrochemical reaction, and carrying out water-sewage separation on the polymer-containing wastewater treated by the electrochemical device through an air flotation process. By adopting the combined method of electrochemical coagulation breaking and air flotation, the invention realizes effective destruction to the polymer, reduces the treatment difficulty caused by the influence of the polymer, realizes effective removal to the oil content and suspended matters, and can partially remove COD. According to the actual use requirement, the method can be used for reinjection after treatment or as a pre-pretreatment process of standard treatment, solves the problems of high polymer content, high viscosity, high oil-water separation difficulty and the like of the polymer-containing wastewater, and provides a method for quickly and effectively breaking a chain, removing oil and removing suspended matters.
Description
Technical Field
The invention relates to a wastewater pretreatment method, in particular to a pretreatment method of polymer-containing wastewater generated in the process of oilfield exploitation.
Background
With the increase of the difficulty of crude oil extraction, new oil extraction technologies are widely used in various oil fields. Wherein the polymer flooding technology is a commonly used and effective oil production technology. With the use of polymer flooding technology, environmental problems also come along, for example, the produced water of an oil field contains a large amount of polymers such as polyacrylamide, an active agent and the like, and the viscosity of the waste water is high, so that the difficulty of oil-water separation is high, and the difficulty of waste water treatment is correspondingly increased.
At present, the treatment of polymer-containing wastewater usually adopts physical, pyrolysis, biodegradation, chemical oxidation, ultrasonic treatment and other treatment methods, and the oil-water separation difficulty is high due to the characteristics of high polymer content, high viscosity and the like of the polymer-containing wastewater, so that the methods have the problems of unsatisfactory treatment effect, high energy consumption, poor biological tolerance, long treatment time, difficult control of reaction conditions and the like in the treatment process, thereby restricting the rapid and effective treatment of the polymer-containing wastewater.
Disclosure of Invention
In order to overcome the defects of non-ideal treatment effect, long treatment time, difficult control of conditions and the like in the prior art, the invention provides the pretreatment method of the polymer-containing wastewater, which can realize the polymerization breaking effect on the polymer-containing wastewater quickly, stably and efficiently and realize the effective separation of oil, water and slag water, thereby laying a good foundation for reinjection application or standard treatment.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for pretreating polymer-containing wastewater, comprising the following steps:
1) Introducing the polymer-containing wastewater into an electrochemical device for electrochemical reaction;
2) Carrying out water and sewage separation on the polymer-containing wastewater treated by the electrochemical device through an air floatation process;
the electrochemical device is an electrochemical reactor which is formed by fixing cathodes and anodes in a reaction device in an alternating arrangement mode and arranging adjacent cathode and anode polar plates at a distance of 3-15 mm;
the air floatation process is a dissolved air floatation process and is used for oil-water separation and residue-water separation.
In the method, the anode of the electrochemical device adopts a titanium-based coating electrode, and the coating is iridium, tin or lead and oxides thereof; the cathode adopts the same type of anode electrode or graphite electrode or stainless steel electrode.
In the method of the present invention, it is preferable that the current density during the operation of the electrochemical device is 100 to 300A/m 2 And the polymer-containing wastewater stays in the electrochemical device for 3-20min during working.
Further preferably, the dissolved air pressure of the air floatation process is controlled to be 0.2-0.3MPa, the rising speed of the water flow in the contact area is 10-20mm/s, the retention time of the contact area is 60-90s, the rising speed of the water flow in the separation area is 1-3mm/s, and the retention time of the separation area is 5-10min.
The polymer-containing wastewater has the oil content of 50-250mg/L, the suspended matter content of 50-350mg/L and the COD content of 1000-3500mg/L.
The invention utilizes the electric field action of the electrochemical device and strong oxidizing groups generated in the electrochemical process to carry out chain scission and polymerization breaking on the polymer-containing wastewater, destroys the stable state of the polymer-containing wastewater and lays a good foundation for realizing effective water and sewage separation of the polymer-containing wastewater. The wastewater after electrochemical treatment can be effectively subjected to oil-water separation and residue-water separation by an air floatation process. The pretreatment method of the polymer-containing wastewater can be used for reinjection after treatment or as a pretreatment process for standard discharge.
The invention has the beneficial effects that:
1. the breaking and gathering efficiency is high. The invention adopts an electrochemical pretreatment method, realizes the chain breaking effect on the polymer in the wastewater under the combined action of an electric field and a strong oxidizing group, destroys the stability of the water body and lays a good foundation for the subsequent treatment means.
2. The treatment process is short. The invention adopts the flow of electrochemical reaction and air flotation separation to realize effective damage to the medium polymer in the wastewater, ensures that the air flotation process can effectively realize effective removal of oil content and suspended matters, and has the characteristic of short treatment flow.
3. The pretreatment effect is good. By adopting the method to treat polymer-containing wastewater, the effluent oil content and the suspended solid content (SS) can meet the relevant requirements of 'water injection quality recommendation index of clastic rock oil reservoir and analysis method SY/T5329-94' in the middle oil industry standard. Meanwhile, partial COD can be removed, and if the wastewater meets the discharge standard, the polymer-containing wastewater treated by the method can well meet the water inlet requirement of the conventional wastewater treatment system, and the treatment pressure of the system is reduced.
The electrochemical treatment method is developed in a targeted manner aiming at the characteristics of polymer-containing wastewater, the polymer in the wastewater can be effectively damaged by adjusting electrochemical operation parameters, the viscosity and the stability of a water body are reduced, the water-sewage separation is effectively realized, and the purpose of primarily purifying water quality is achieved or the electrochemical treatment method is used as a pretreatment method for standard treatment.
Drawings
Figure 1 is a schematic view of the principle and arrangement of an electrochemical device according to the present invention,
in the figure: 1 an electrochemical device housing; 2 an anode; 3, a cathode; 4 an anode electrode connector; 5 a cathode electrode connector; 6 connecting the anode of the power supply externally; 7 connecting the cathode of the power supply; 8, a water inlet; 9 water outlet; a represents a plate pitch
Detailed Description
The technical solutions and advantages of the present invention will be further described with reference to the following embodiments and accompanying drawings.
Example 1:
the initial water quality of certain polymer-containing wastewater in the Suizhong oil field is shown in Table 1.
TABLE 1
| Item | Oil content mg/L | SSmg/L | CODmg/L |
| Quality of raw water | 153.6 | 284.3 | 2790 |
As shown in fig. 1, the electrochemical device includes an electrochemical device housing 1; the electrochemical device shell 1 is provided with a water inlet 8 and a water outlet 9 of the device, an anode group formed by connecting 5 anodes 2 through an anode electrode connector 4 and a cathode group formed by connecting a cathode 3 through a cathode electrode connector 5 are arranged in the device, wherein the cathodes and the anodes are fixed in the reaction device in an alternative arrangement mode, and the distance between adjacent cathode and anode polar plates is 3-15 mm; the anode group is provided with an external power supply anode 6; the cathode group is provided with an external power supply cathode 7. The anode of the electrochemical device adopts a titanium-based stannic oxide coating electrode, and the cathode adopts a stainless steel electrode. The structural form of the electrochemical device based on the principle can be set to be rectangular or circular, and the arrangement mode can adopt a vertical mode or a horizontal mode.
Introducing polymer-containing wastewater into an electrochemical device, setting the distance between polar plates to be 6mm and the current density to be 120A/m 2 The electrochemical reaction time is 12min, the effluent of the electrochemical device adopts air flotation separation, the dissolved air pressure is 0.3MPa, the rising speed of the water flow in the contact area is 15mm/s, the retention time of the contact area is 80s, the rising speed of the water flow in the separation area is 2mm/s, and the retention time of the separation area is 8min.
After the treatment by the method, the removal rate of the oil content reaches 93 percent, the removal rate of SS reaches 96.9 percent, and the removal rate of COD is 23.1 percent. The effluent quality analysis is shown in table 2.
TABLE 2
| Item | Oil content mg/L | SSmg/L | CODmg/L |
| Water outlet result | 10.7 | 8.8 | 2145 |
| Removal rate | 93.0％ | 96.9％ | 23.1％ |
Example 2:
the polymer-containing wastewater in the Xinjiang oil field has high viscosity of the suspension and very stable system. The initial water quality is shown in Table 3.
TABLE 3
| Item | Oil content mg/L | SSmg/L | CODmg/L |
| Results from raw water | 205.8 | 345.6 | 3145 |
The anode of the electrochemical device adopts a titanium-based lead dioxide coating electrode, and the cathode adopts a graphite electrode.
Introducing polymer-containing wastewater into an electrochemical device, wherein the distance between polar plates is 6mm, and the current density is set to be 160A/m 2 The electrochemical reaction time is 16min, the water discharged from the electrochemical device is separated by air flotation, the dissolved air pressure is 0.3MPa, the rising speed of the water flow in the contact area is 10mm/s, the retention time of the contact area is 90s, the rising speed of the water flow in the separation area is 1mm/s, and the retention time of the separation area is 10min.
After the treatment by the method, the removal rate of the oil content reaches 93.3 percent, the removal rate of SS reaches 94.4 percent, and the removal rate of COD is 22.1 percent. The effluent quality analysis is shown in table 4.
TABLE 4
| Item | Oil content mg/L | SSmg/L | CODmg/L |
| Water outlet result | 13.8 | 19.3 | 2450 |
| Removal rate | 93.3％ | 94.4％ | 22.1％ |
Example 3:
the initial water quality of a certain polymer-containing wastewater in Daqing oil field is shown in Table 5.
TABLE 5
| Item | Oil content mg/L | SSmg/L | CODmg/L |
| Results from raw water | 95.2 | 188.4 | 1850 |
The anode of the electrochemical device adopts a titanium-based iridium oxide coating electrode, and the cathode adopts the same electrode as the anode.
Introducing polymer-containing wastewater into an electrochemical device, wherein the distance between polar plates is 6mm, and the current density is set to be 300A/m 2 The electrochemical reaction time is 3min, the effluent of the electrochemical device adopts air flotation separation, the effluent of the electrochemical device carries out air flotation separation, and the pressure of dissolved air is0.2MPa, the rising speed of the water flow in the contact zone is 20mm/s, the retention time of the contact zone is 60s, the rising speed of the water flow in the separation zone is 3mm/s, and the retention time of the separation zone is 5min.
After the treatment by the method, the removal rate of oil content reaches 94.3%, the removal rate of SS reaches 97%, and the removal rate of COD is 26.8%. The effluent quality analysis is shown in table 6.
TABLE 6
| Item | Oil content mg/L | SSmg/L | CODmg/L |
| Water outlet result | 5.4 | 5.6 | 1355 |
| Removal rate of | 94.3％ | 97.0％ | 26.8％ |
The above embodiments are specific examples in the practical process, and do not limit the technical scope of the present invention, so any minor modifications, structural modifications or arrangement modifications, etc. made to the method of the present invention still belong to the technical scope of the present invention.
Claims (5)
1. The pretreatment method of the polymer-containing wastewater is characterized by comprising the following steps:
1) Introducing the polymer-containing wastewater into an electrochemical device for electrochemical reaction;
2) The polymer-containing wastewater treated by the electrochemical device is subjected to water and sewage separation by an air flotation process.
The cathode and the anode of the electrochemical device are fixed in the reaction device in an alternating arrangement mode, and the adjacent cathode and anode polar plates are arranged in a mode of 3-15mm in distance to form the electrochemical reactor;
the air floatation process is a dissolved air floatation process and is used for oil-water separation and residue-water separation.
2. The method of claim 1, wherein the pretreatment of the polymer-containing wastewater comprises: the anode of the electrochemical device adopts a titanium-based coating electrode, and the coating is iridium, tin or lead and oxides thereof; the cathode adopts the same type of electrode as the anode or a graphite electrode or a stainless steel electrode.
3. The method for pretreating polymer-containing wastewater according to claim 1, wherein: the current density of the electrochemical device in the working process is 100-300A/m 2 And the polymer-containing wastewater stays in the electrochemical device for 3-20min during working.
4. The method of claim 1, wherein the pretreatment of the polymer-containing wastewater comprises: the air floatation process controls the dissolved air pressure to be 0.2-0.3MPa, the rising speed of water flow in a contact area to be 10-20mm/s, the retention time of the contact area to be 60-90s, the rising speed of the water flow in a separation area to be 1-3mm/s, and the retention time of the separation area to be 5-10min.
5. The method for pretreating polymer-containing wastewater according to claim 1, wherein: the polymer-containing wastewater has oil content of 50-250mg/L, suspended matter content of 50-350mg/L and COD content of 1000-3500mg/L.
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Citations (7)
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|---|---|---|---|---|
| CN101050040A (en) * | 2007-05-14 | 2007-10-10 | 北京科技大学 | Apparatus for treating sewage containing oil, and processing technique |
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| CN102336491A (en) * | 2010-07-14 | 2012-02-01 | 北京纬纶华业环保科技股份有限公司 | Advanced treatment and recycling method for polymer-bearing oil extraction waste water |
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-
2022
- 2022-06-12 CN CN202210645838.0A patent/CN115215413A/en active Pending
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