CN111825265A - Oilfield produced water treatment method - Google Patents
Oilfield produced water treatment method Download PDFInfo
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- CN111825265A CN111825265A CN201910328713.3A CN201910328713A CN111825265A CN 111825265 A CN111825265 A CN 111825265A CN 201910328713 A CN201910328713 A CN 201910328713A CN 111825265 A CN111825265 A CN 111825265A
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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
- C02F1/40—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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
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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
- C02F2001/007—Processes including a sedimentation step
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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
- 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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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Abstract
The invention provides an oilfield produced water reinjection treatment method, which adopts a gravity settling device, an electric field oil removal device and a filtering device and comprises the following steps: gravity settling, namely conveying the raw water of the produced water to a gravity settling device for primary separation of oil, water and mud; removing oil by an electric field, namely conveying the sewage subjected to gravity settling to an electric field oil removing device for removing emulsified oil and suspended matters; and filtering, wherein the effluent after oil removal by the electric field is conveyed to a filtering device, and emulsified oil and suspended matters are further removed to enable the effluent to meet the reinjection requirement. The treatment method realizes the rapid, efficient and low-cost treatment of the oilfield produced water, and particularly can improve the removal efficiency of emulsified oil.
Description
Technical Field
The invention relates to the field of oil field water treatment machinery, in particular to a method for treating oil field produced water.
Background
At present, most oil fields in China enter the middle and later development stages, the water content of crude oil reaches 70% -95%, and the treatment of produced water as stratum reinjection water is the main treatment measure at present. The produced water dissolves and carries a large amount of petroleum substances, inorganic salts, bacteria, solid particles and the like under the condition of high temperature and high pressure of the stratum, the water quality is complex, and the treatment difficulty is high. According to the current stratum reinjection standard in China, for most of oilfield produced water, the main treatment target is to produce petroleum and suspended matters in the water. Generally, the oil content in the produced water is 1000-5000mg/L, wherein about 90% of the produced water is suspension oil (more than 100 μm) and dispersion oil (10-100 μm), about 10% of the produced water is emulsified oil (0.1-10 μm) and a small amount of dissolved oil (less than or equal to 1%). The suspended matter is composed of various solid particles, such as clay, paraffin, zoogloea, silt, non-soluble organic matter, and the like.
In engineering application, the commonly used produced water treatment process is a 'three-set' process of 'gravity settling, air flotation, coagulation and filtration', and the stages of settling and air flotation can be properly increased according to the characteristics of the produced water of each oil field so as to ensure the quality of water injected. For low-permeability stratum, fine filtration, membrane filtration and other processes are added. The traditional produced water reinjection treatment process can stably operate and realize the standard treatment of the produced water, but a large amount of medicament needs to be added in the treatment process, so that the problems of secondary pollution, treatment and disposal of chemical sludge and the like are caused, and the operation cost is high. Particularly for emulsified oil in produced water, the existing method mainly depends on adding a demulsifier and a flocculant, and a high-efficiency and low-cost treatment process is lacked.
Chinese patent CN107417019A, a process for treating oilfield produced water, discloses a process for treating oilfield produced water by standard reinjection, which comprises the steps of adjusting tank → aeration settling tank → oil-water separator → micro flocculation tank → high efficiency filter → ultraviolet disinfection. The method comprises the steps of adding a demulsifier and a coagulant into raw water after the raw water passes through a regulating tank, realizing primary separation of oil, water and mud in an aeration settling tank pool, and then further removing emulsified oil and suspended matters in the water by adopting an oil-water separator, a micro-flocculation tank and a high-efficiency filter. The process improves the common settling tank into the aeration settling tank, shortens the treatment process, improves the separation effect of oil, water and mud of the settling tank, reduces the dosage of the medicament to a certain extent, but mainly depends on the dosage of the demulsifier and the filtration for removing the emulsified oil. Therefore, there are problems such as a large sludge production amount and a high load on the filter apparatus.
Chinese patent CN102153221B discloses a treatment process for oilfield produced water, which adopts a combined process of air flotation, a power reactor and ultrasonic filtration to treat oilfield produced water, wherein both the air flotation and the power reactor adopt nitrogen as an air source. The core of the process is a high-efficiency dissolved air nitrogen air flotation and nitrogen power reactor, which can efficiently remove oil and suspension and simultaneously avoid the corrosion problem caused by dissolved oxygen. However, nitrogen is used as a gas source, so that the requirements on the tightness and the operation and maintenance of the device are high, nitrogen production and nitrogen circulation devices are required to be added, and the investment cost in the early stage is increased. For emulsified oil, the air floatation still needs to be matched with a medicament to achieve a better oil removal effect.
Chinese patent CN104016452B discloses an oilfield produced water process, which is particularly suitable for the treatment of polymer-containing produced water, and the process flow is as follows: the produced water and the reverse demulsifier are introduced into a demulsifier loaded with a high-voltage pulse electric field, the produced water after demulsification is fed from the middle upper part of the air floatation separator, charged bubbles prepared by a surfactant are fed from the middle lower part of the air floatation separator, air bubbles are fed from the lower part of the air floatation separator, and the charged bubbles adsorb emulsified oil drops and have synergistic action with air floatation, so that the purpose of oil-water separation is achieved. The process can effectively break emulsion and has high oil-water separation efficiency. However, the high-voltage pulse electric field has potential safety hazards for produced water, and the produced water generally has high inorganic ion content, so that the dielectric constant of the produced water is obviously reduced, and the produced water is easy to break down to cause short circuit. In addition, the high voltage causes problems such as electrode corrosion due to electrochemical reaction, and the maintenance workload is increased. Meanwhile, the process still needs to add a reverse-phase demulsifier and a surfactant, so that the problem of secondary pollution is easily caused.
Disclosure of Invention
Aiming at part or all of the technical problems in the prior art, the invention provides a reinjection treatment method for oilfield produced water, which realizes the quick, efficient and low-cost treatment of oilfield produced water, and particularly can improve the removal efficiency of emulsified oil.
In order to realize the aim, the invention provides an oilfield produced water reinjection treatment method, which adopts a gravity settling device, an electric field oil removal device and a filtering device and comprises the following steps:
gravity settling, namely conveying the raw water of the produced water to a gravity settling device for primary separation of oil, water and mud;
removing oil by an electric field, namely conveying the sewage subjected to gravity settling to an electric field oil removing device for removing emulsified oil and suspended matters; and
and (4) filtering, namely conveying the effluent after the oil is removed by the electric field to a filtering device, and further removing emulsified oil and suspended matters to ensure that the effluent meets the reinjection requirement.
According to the invention, the removal of emulsified oil and suspended solids is realized through the three physical process steps, the reinjection standard of the oilfield produced water can be well met, and the problems of secondary pollution and chemical sludge treatment are reduced because no chemical agent is added, so that the oilfield produced water can be treated quickly, efficiently and at low cost. In addition, in the three steps, emulsified oil is removed in different physical modes, so that the removal efficiency of the emulsified oil is improved, and a better removal effect can be obtained.
In one embodiment, one end is equipped with the water inlet in the electric field deoiling device, and the other end is equipped with delivery port and oil-out respectively, and the bottom is equipped with the mud discharging port, be provided with the plate electrode in a row along the length direction of water inlet to delivery port in the electric field deoiling device, it has the coalescence material to fill between the adjacent plate electrode.
In one embodiment, the electrode plate is made of carbon-based or silicon-based materials, including but not limited to graphite, ceramics and materials modified on the basis of the carbon-based or silicon-based materials, and the working pressure of the electrode plate is 1V to 30V.
In one embodiment, the electrode plate and the coalescing material are connected with an electrode support plate and a filler support plate, both of which are porous plates; and the distance from the bottom of the electrode plate to the bottom of the electric field oil removing device is 1/6-1/4 of the maximum working area height of the electric field oil removing device.
In one embodiment, the water inlet is positioned from 1/5 to 1/4 from the bottom of the electric field degreasing apparatus. And a plurality of water inlets are arranged in the gaps between the corresponding electrode plates. One or two oil outlets are arranged. The transverse distance between the electrode plate and the oil outlet is at least 20 cm. The distance between the top of the electrode plate and the oil outlet is 1/5-1/3 of the height of the maximum working area of the electric field oil removing device. And an oil separating weir is arranged on the oil outlet.
In one embodiment, the water outlet is positioned below the oil outlet and higher than the water inlet, and a water baffle is arranged in front of the water outlet.
In one embodiment, the packed coalescing material includes, but is not limited to, one or more of zeolites, PP plastic spheres, raschig rings. Preferably, the filled coalescer material is designed in a porous shape.
In one embodiment, the working time of the gravity settling is 0.5h to 10h, and the working time of the electric field oil removal is 15min to 45 min; the filter device adopts a one-stage or two-stage filter, and the filler selected in the filter comprises but is not limited to one or a combination of more of walnut shells, quartz sand, anthracite and porous ceramics.
In one embodiment, the filtration device further comprises a backwash water mechanism, wherein the backwash water mechanism periodically cleans the filtration device, and the generated backwash water flows back to the inlet of the gravity settling device.
In one embodiment, the oil content and suspended matter of the effluent after gravity settling are not more than 100 mg/L; after the oil is removed by an electric field, the oil content and suspended matters in the effluent are not more than 20 mg/L; after filtration treatment, the oil content is less than 5mg/L, and the suspended matter content is less than 1 mg/L.
Compared with the prior art, the invention has the advantages that:
1) chemical agents such as demulsifiers, flocculating agents and the like are not added, the yield of chemical sludge is effectively reduced, the problem of secondary pollution is avoided, and the operation cost can be greatly reduced.
2) The treatment process is simple, the retention time is short, and the early investment cost can be effectively reduced.
3) The equipment is simple and easy to maintain, and particularly, the electric field oil removing device has no problem of electrode loss and runs stably. After filtration treatment, the oil content is less than 5mg/L, the suspended matter content is less than 1mg/L, the limit standard of the oil field on the oil content and suspended matter of the reinjection water is achieved, and the effluent quality is better than the reinjection limit standard.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:
fig. 1 shows one embodiment of the process flow of the oilfield produced water reinjection treatment method of the present invention.
Fig. 2 is a front view of one embodiment of the electric field oil removing apparatus of fig. 1.
Fig. 3 is a top view of the electric field oil removing apparatus of fig. 2.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
In order to make the technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.
The inventor notices in the invention process that in order to meet the requirement of reinjection, a large amount of medicament needs to be added in the treatment process of the produced water in the existing oil field, so that the problems of secondary pollution, treatment and disposal of chemical sludge and the like are caused, and the operation cost is high.
In view of the above disadvantages, the embodiment of the present invention provides a method for treating oilfield produced water by reinjection, which is described in detail below.
FIG. 1 shows one embodiment of the process flow of the oilfield produced water reinjection treatment method of the present invention. In this embodiment, the oilfield produced water reinjection treatment method of the present invention employs a gravity settling device, an electric field oil removal device, and a filtering device, and mainly includes the following steps: gravity settling, namely conveying the raw water of the produced water to a gravity settling device for primary separation of oil, water and mud; removing oil by an electric field, namely conveying the sewage subjected to gravity settling to an electric field oil removing device for removing emulsified oil and suspended matters; and filtering, namely conveying the effluent after the oil removal by the electric field to a filtering device to further remove emulsified oil and suspended matters for reinjection treatment.
In the figure 1, the treatment of the oilfield produced water is realized to reach the standard of produced water reinjection, and is mainly realized by three processes of gravity settling of a gravity settling device, removal of emulsified oil and suspended matters by an electric field oil removal device and filtration by a filtering device, and the three processes are realized in a physical mode without adding a medicament, so that the problems of secondary pollution, treatment of chemical sludge and the like are not involved, the treatment steps are relatively few, the operation cost is low, the operation efficiency is high, and the treatment is easier to maintain.
In one embodiment, as shown in the process flow of the oilfield produced water reinjection treatment method shown in fig. 1, after raw produced water is subjected to gravity settling by a gravity settling device, suspended oil, dispersed oil, a small amount of emulsified oil and suspended matters in the produced water are removed for settling and separation, settled sludge is discharged through a sludge pipeline, and suspended oil is discharged through an oil collecting pipeline arranged on the upper side of the gravity settling device. The sewage after the gravity subsides is carried electric field deoiling device, and after the power applied outside electric field through the electrode, the emulsification oil that usually the surface has the electric charge drips can accelerated motion under the electric field effect, and then improves the collision frequency that the emulsification oil drips and gathers and speed, and the oil-out discharge of emulsified oil from electric field deoiling device realizes getting rid of emulsified oil. Similarly, suspended particles, which are also generally charged on their surface, are collected into larger particles under the action of an electric field, settle and are discharged through a sludge line on the lower side. And (4) conveying the output water subjected to deoiling in the electric field to a filtering device, further removing emulsified oil and suspended matters, and conveying the output water subjected to detection treatment to a reinjection system for reinjection after the output water reaches the reinjection standard.
In one embodiment, as shown in fig. 2 and 3, one end (left side in fig. 2) of the electric field oil removing device is provided with a water inlet 1, and the other end (right side in fig. 2) is provided with a water outlet 11 and an oil outlet 10 respectively. The bottom is provided with a sludge discharge port 12. A plurality of rows of electrode plates 3 are arranged in the electric field oil removing device along the length direction (from left to right in fig. 3) from the water inlet 1 to the water outlet 11, and a coalescing material 5 is filled between the adjacent electrode plates 3. In a preferred embodiment, a water inlet is respectively arranged on the side wall surfaces of the water inlet of the electric field oil removing device corresponding to the position between the two electrode plates 3. Therefore, the electric field oil removing device is provided with a plurality of water inlets 1 corresponding to the gaps between the electrode plates 3 and positioned on the side wall surface of the water inlets.
In one embodiment, as shown in fig. 2 and 3, the electrode plate 3 is made of a carbon-based or silicon-based material. Carbon-based or silicon-based materials include, but are not limited to, graphite, ceramics, and materials modified based thereon. In operation, the working pressure of the electrode plate 3 is 1V 30V. As shown in fig. 3, during operation, one end of the electrode plate 3 is connected to the positive electrode of the dc power supply 7, the end of the adjacent electrode plate 3 away from the positive electrode is connected to the negative electrode of the dc power supply 7, and the electrode plate terminal is sealed and waterproof. Thereby increasing the probability of collision between emulsified oil drops and between suspended particles when flowing from the water inlet side to the water outlet side.
In one embodiment, as shown in fig. 2 and 3, the electrode plate 3 and the coalescing material 5 are further coupled with an electrode support plate 4 and a filler support plate 6, respectively. The electrode support plate 4 and the filler support plate 6 are both porous plates, so that the overall flow of emulsified oil and sludge and treated produced water is not affected. In one embodiment, as shown in fig. 2, the bottom of the electrode plate 3 is separated from the bottom of the electric field degreasing device by a distance 1/6 to 1/4 of the maximum working area height of the electric field degreasing device. The maximum working area height refers to the height of the uppermost oil level when the electric field oil removing device can work normally and is filled with the produced water to be treated. Generally, the outer side of the electric field oil removing device is provided with an indicating mark or a marking line for indicating the height of the maximum working area.
In one embodiment, as shown in FIG. 2, the water inlet 1 is located at 1/5 to 1/4 from the bottom of the electric field degreasing apparatus. The oil outlet 10 is provided with one or two. The tail part (the rightmost side in figure 2) of the electrode plate 3 is at least 20cm away from the oil outlet 10 in the transverse direction. The distance between the top of the electrode plate 3 and the oil outlet 10 is 1/5-1/3 of the maximum working area height of the electric field oil removing device. An oil separating weir 9 is arranged on the oil outlet 10. The oil separation weir 9 is constructed in a slope shape to prevent water from entering the oil outlet 10. And the oil phase enters the oil outlet 10 through the oil separation weir 9 in an overflow mode.
In one embodiment, as shown in fig. 2, the water outlet 11 is located below the oil outlet 10 and above the water inlet 1. And a water baffle 8 is arranged in front of the water outlet 11. Under the action of an electric field, emulsified oil is demulsified and coalesced and is separated by gravity, an oil phase moves upwards and overflows through an oil outlet 10, and output water subjected to oil removal by the electric field flows downwards to a water outlet 11 through a water baffle 8.
In one embodiment, as shown in fig. 2 and 3, the packed coalescing material 5 includes, but is not limited to, one or more of zeolite, PP plastic spheres, raschig rings. The filled coalescer material 5 is designed in a porous shape.
In one embodiment, the working time for gravity settling is 0.5h to 10h, as shown in fig. 1 to 3. The working time of the electric field oil removal is 15min to 45 min.
In one embodiment, as shown in FIG. 1, the filtration device employs a one-stage or two-stage filter. The filler selected in the filter comprises but is not limited to one or a combination of more of walnut shells, quartz sand, anthracite and porous ceramics.
In one embodiment, as shown in fig. 1, the filter device further comprises a backwash water mechanism which periodically cleans the filter device and generates backwash water which flows back to the inlet of the gravity settling device.
In a preferred embodiment, the main water quality characteristics of the oilfield produced water tested were: the main water quality characteristics of the oilfield produced water are as follows: oil content is 1000-5000mg/L, and suspended matter is 100-1000 mg/L. Firstly, conveying produced water to a gravity settling device for removing suspended oil, dispersed oil, a small amount of emulsified oil and easily settled suspended matters, wherein the operation conditions are as follows: the water inlet temperature is 40 deg.C, the operation pressure is normal pressure, and the settling residence time is 30-60 min. Secondly, carry out the play water of gravity settling device to electric field deoiling device and emulsify the getting rid of oil and the part suspended solid that is difficult to subside, its operating condition is: the water inlet temperature is 40 deg.C, the applied voltage is 2-10V, the retention time is 20min, and the operation pressure is normal pressure. And finally, delivering the effluent of the electric field oil removal device to a filtering device for reinjection standard-reaching treatment of oil and suspended matters, wherein the operating conditions are as follows: the water inlet temperature is 40 deg.C, the filtering retention time is 3-5min, and the operation pressure is normal pressure.
In a preferred embodiment, furthermore, the oilfield produced water standard reinjection treatment device comprises a gravity settling device, an electric field oil removal device and a filtering device. Wherein, the gravity settling device selects a conventional oil removal tank, and the filtering device selects a walnut shell filter. As shown in fig. 2 and 3, the electric field oil removing device includes a water inlet pipe 1, a perforated water distribution pipe 2, an electrode plate 3, an electrode support plate 4, a coalescing filler 5, a filler support plate 6, a direct current power supply 7, a water baffle 8, an oil separating weir 9, an oil outlet 10, a water outlet 11, and a sludge discharge port 12. The water inlet pipe 1 is positioned at the middle lower part of the device and is connected with the perforated water distribution pipe 2, the perforated water distribution pipe 2 is provided with a plurality of small holes, and each small hole corresponds to one group of electrode plates 3. An electrode support plate 4 is fixed to the lower middle portion of the apparatus, and an electrode plate 3 is mounted on the electrode support plate 4. The coalescent filler 5 is filled between the adjacent electrode plates of the electrode plates 3, and the filler support plates 6 are located at both sides of the electrode plates 3. The electrode supporting plate 4 and the filler supporting plate 6 are both perforated plates, and are mainly used for fixing the filler so as to prevent the filler from losing. The top of the plate electrode 3 is provided with a binding post which is connected with the positive and negative electrodes of the DC power supply 7 in sequence, namely the electric property of the adjacent plate electrodes is opposite, and the plate electrode binding post is sealed and waterproof. The water baffle 8 is connected with the bottom of the device and mainly has the function of forming a better flow field so as to improve the oil removing effect. The oil separating weir 9 is positioned at the upper part of the device and is connected with the oil outlet 10. The water outlet 11 is positioned at the middle lower part of the device, and the sludge discharge port 12 is positioned at the bottom of the device.
In one embodiment, after testing, the oil content and suspended matter of the produced water of the oil field after gravity settling are less than 100mg/L after being treated by adopting the devices and the process conditions of the two preferred embodiments. After the oil is removed by the electric field, the oil content and suspended matters in the effluent are both less than 20 mg/L. After filtration treatment, the oil content is less than 5mg/L, and the suspended matter content is less than 1mg/L, which meets the limit standard of oil field for the oil content and suspended matter of reinjection water.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to be construed to include preferred embodiments and all such changes and/or modifications as fall within the scope of the invention, and all such changes and/or modifications as are made to the embodiments of the present invention are intended to be covered by the scope of the invention.
Claims (10)
1. The oilfield produced water treatment method is characterized by adopting a gravity settling device, an electric field oil removal device and a filtering device and comprising the following steps:
gravity settling, namely conveying the raw water of the produced water to a gravity settling device for primary separation of oil, water and mud;
removing oil by an electric field, namely conveying the sewage subjected to gravity settling to an electric field oil removing device for removing emulsified oil and suspended matters; and
and (4) filtering, namely conveying the effluent after the oil is removed by the electric field to a filtering device, and further removing emulsified oil and suspended matters to ensure that the effluent meets the reinjection requirement.
2. The treatment method according to claim 1, wherein the electric field oil removal device is provided with a water inlet at one end, a water outlet and an oil outlet at the other end, respectively, and a sludge discharge port at the bottom, electrode plates are arranged in rows along the length direction from the water inlet to the water outlet in the electric field oil removal device, and a coalescing material is filled between the adjacent electrode plates.
3. The treatment method according to claim 2, wherein the electrode plate is made of carbon-based or silicon-based materials, the carbon-based or silicon-based materials include but are not limited to graphite, ceramics and materials modified on the basis of the graphite and the electrode plate is operated at a pressure of 1V-30V.
4. The process according to claim 2 or 3, wherein the electrode plate and the coalescing material are connected with an electrode support plate and a filler support plate, both of which are porous plates; and the distance from the bottom of the electrode plate to the bottom of the electric field oil removing device is 1/6-1/4 of the maximum working area height of the electric field oil removing device.
5. The treatment method according to claim 4, wherein the water inlet is provided at 1/5 to 1/4 from the bottom of the electric field oil removing device, and a plurality of water inlets are provided corresponding to the gaps between the electrode plates; the oil outlet is provided with one or two oil outlets, the transverse distance between the electrode plate and the oil outlet is at least 20cm, the distance between the top of the electrode plate and the oil outlet is 1/5-1/3 of the height of the maximum working area of the electric field oil removing device, and an oil separating weir is arranged in front of the oil outlet.
6. The treatment method according to any one of claims 2 to 5, wherein the water outlet is located below the oil outlet and above the water inlet, and a water baffle is arranged in front of the water outlet.
7. The process of claim 1 or 6, wherein the packed coalescing material includes, but is not limited to, one or more of zeolite, PP plastic spheres, Raschig rings.
8. The treatment method according to claim 1 or 7, wherein the working time of the gravity settling is 0.5 to 10 hours, and the working time of the electric field degreasing is 15 to 45 min; the filter device adopts a one-stage or two-stage filter, and the filler selected in the filter comprises but is not limited to one or a combination of more of walnut shells, quartz sand, anthracite and porous ceramics.
9. The process of claim 8 wherein the filtration unit further comprises backwash water means for periodically cleaning the filtration unit and returning the backwash water produced to the inlet of the gravity settling device.
10. The treatment method according to claim 1 or 9, wherein the oil content and suspended matter of the effluent after gravity settling are not more than 100 mg/L; after the oil is removed by an electric field, the oil content and suspended matters in the effluent are not more than 20 mg/L; after filtration treatment, the oil content is less than 5mg/L, and the suspended matter content is less than 1 mg/L.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112520921A (en) * | 2020-12-01 | 2021-03-19 | 华东理工大学 | Multi-physical-field-synergetic oily sewage treatment method and device |
| CN115594261A (en) * | 2021-07-07 | 2023-01-13 | 中国石油化工股份有限公司（Cn） | Coalescence device for electric field separation equipment and electric field separation equipment |
| CN116639826A (en) * | 2022-10-26 | 2023-08-25 | 中国石油天然气股份有限公司 | CO (carbon monoxide) 2 Drive produced water reinjection treatment system and method |
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