CN109553241B - Oily sewage treatment device and method - Google Patents
Oily sewage treatment device and method Download PDFInfo
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- CN109553241B CN109553241B CN201710892686.3A CN201710892686A CN109553241B CN 109553241 B CN109553241 B CN 109553241B CN 201710892686 A CN201710892686 A CN 201710892686A CN 109553241 B CN109553241 B CN 109553241B
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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
- C02F1/40—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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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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- Water Treatment By Electricity Or Magnetism (AREA)
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Abstract
The invention discloses an oily sewage treatment device and a method, wherein the device comprises: a water inlet, a water outlet, an oil stain removing part and a suspended matter removing part; the oil stain removing part comprises an oil stain coalescing unit and an oil stain inclined plate settling unit, and a first baffle is arranged between the oil stain coalescing unit and the oil stain inclined plate settling unit; the suspended matter removing part comprises an electric flocculation unit, a suspended matter inclined plate sedimentation unit and a sludge sedimentation concentration unit, a second baffle is arranged between the electric flocculation unit and the suspended matter inclined plate sedimentation unit, and the sludge sedimentation concentration unit is arranged at the lower part of the suspended matter inclined plate sedimentation unit; and a third baffle is arranged between the oil stain inclined plate precipitation unit and the electric flocculation unit. The device and the method provided by the invention can realize the removal rate of more than 95% of oil and suspended matters in the sewage under the condition of not adding a medicament.
Description
Technical Field
The invention relates to the field of water treatment, in particular to an oily sewage treatment device and method.
Background
Most oil fields in China adopt a water injection development mode, and the development for many years leads all the oil fields to enter a high water cut period. Due to the application of a large amount of chemical agents in the oil extraction process and the extremely complex factors of biology, chemistry, physics and the like in the oil extraction process, the oil reservoir characteristics and the components of produced liquid are greatly changed, and the produced liquid dehydrated water contains a large amount of crude oil which is generally called as oily sewage.
The traditional oily sewage treatment technology mainly adopts a chemical treatment method, and has the advantages of large dosage, high medicament cost and large sludge yield. Based on the above disadvantages, the electrochemical sewage treatment process has become a new sewage treatment process in recent years, has the advantages of small dosage and the like, and is called as "green chemistry" in the sewage treatment field. At present, the research on electrochemical treatment of oily sewage mostly focuses on aspects of electric flocculation, electric air flotation, electrolysis and the like, and by adopting the electrochemical treatment method, a large amount of electric energy is consumed due to chemical reaction, so that the problem of high power consumption is caused, and the defects of anode sacrifice, high anode loss cost and the like exist.
Therefore, there is a need for an apparatus and a method for treating oily sewage, which can consume less power and can add less or no chemicals.
Disclosure of Invention
The invention provides an oily sewage treatment device and method, which can remove oil stains and suspended matters in sewage through the adsorption effect of an electric field without adding a medicament.
According to an aspect of the present invention, there is provided an oily sewage treatment apparatus, comprising: a water inlet, a water outlet, an oil stain removing part and a suspended matter removing part; the oil stain removing part comprises an oil stain coalescing unit and an oil stain inclined plate settling unit, and a first baffle is arranged between the oil stain coalescing unit and the oil stain inclined plate settling unit; the oil stain coalescence unit and the oil stain inclined plate precipitation unit are charged units; the suspended matter removing part comprises an electric flocculation unit, a suspended matter inclined plate sedimentation unit and a sludge sedimentation concentration unit, a second baffle is arranged between the electric flocculation unit and the suspended matter inclined plate sedimentation unit, and the sludge sedimentation concentration unit is arranged at the lower part of the suspended matter inclined plate sedimentation unit; the electric flocculation unit and the suspended matter inclined plate sedimentation unit are both electrified units; and a third baffle is arranged between the oil stain inclined plate precipitation unit and the electric flocculation unit.
According to another aspect of the present invention, there is provided a wastewater treatment method including the steps of: oil stain coalescence treatment, wherein sewage enters the oil stain coalescence unit through the water inlet, moves towards the direction of the electric coalescence filler under the action of a micro electric field, and collides and coalesces on the surface of the coalescence filler to realize coarse granulation of oil drops;
oil removing treatment, namely allowing the sewage subjected to the oil stain coalescence treatment to pass through an oil stain inclined plate precipitation unit, allowing oil drops to quickly float up to an upper inclined plate under the action of electric field adsorption, enriching the oil drops above the water surface, and collecting oil stains through an oil collecting tank;
coagulation flocculation treatment, namely enabling the sewage subjected to the oil removal treatment to enter the electric flocculation unit, and performing the coagulation flocculation treatment on suspended matters and residual oil stains in the sewage under the action of electric flocculation;
deoiling and suspended solid are handled, process the sewage that the flocculation and coagulation was handled passes through suspended solid swash plate subsides the unit and realizes the suspended solid under the electric field adsorption effect with higher speed sink with the come-up of residual greasy dirt, and then make sunken suspended solid passes through the concentrated unit discharge is subsided to mud, the residual greasy dirt is collected through receiving the oil groove, and sewage after the purification passes through the delivery port is discharged.
According to the device and the method provided by the invention, physical coalescence is used for removing oil, and more than 80% of oil drops can be removed through the electric field and the physical coalescence; the coagulation flocculation effect of the electric flocculation and the adsorption effect of the inclined plate electric field are utilized to remove suspended matters and oil drops with smaller grain sizes, and finally the removal rate of oil and the suspended matters is more than 95%. In the operation process of the whole device, no medicament is required to be added, and only low voltage needs to be loaded on the device, so that the cost of a large amount of medicament can be saved, the sludge yield is reduced, and the operation cost of the device is low.
The method and apparatus of the present invention have other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts.
Fig. 1 shows a schematic view of an oily sewage treatment apparatus according to the present invention.
Fig. 2 shows a top view of an electrically coalescing filler material according to the present invention.
Description of the reference numerals
1. Water inlet 2, electric coalescence filler 3, foraminiferous backup pad 4, first baffle 5, first electrified swash plate 6, second swash plate electricity receiving tank 7, first swash plate electricity receiving tank 8, electric coalescence negative plate 9, first drain 10, oil receiving tank 11, oil receiving tank 12, first positive plate 13, second positive plate 14, first negative plate 15, second negative plate 16, the electrified swash plate 17 of second, oil receiving tank 18, oil receiving tank 19, second baffle 20, third baffle 21, delivery port 22, third swash plate electricity receiving tank 23, fourth swash plate electricity receiving tank 24, second drain 22
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Fig. 1 shows a schematic view of an oily sewage treatment apparatus according to the present invention.
As shown in fig. 1, an aspect of the present invention provides an oily sewage treatment apparatus, comprising: the water inlet 1, the water outlet 21, the oil stain removing part and the suspended matter removing part; the oil stain removing part comprises an oil stain coalescing unit and an oil stain inclined plate settling unit, and a first baffle 4 is arranged between the oil stain coalescing unit and the oil stain inclined plate settling unit; the oil stain coalescence unit and the oil stain inclined plate precipitation unit are charged units; the suspended matter removing part comprises an electric flocculation unit, a suspended matter inclined plate sedimentation unit and a sludge sedimentation concentration unit, a second baffle plate 19 is arranged between the electric flocculation unit and the suspended matter inclined plate sedimentation unit, and the sludge sedimentation concentration unit is arranged at the lower part of the suspended matter inclined plate sedimentation unit; the electric flocculation unit and the suspended matter inclined plate sedimentation unit are both electrified units; a third baffle plate 20 is arranged between the oil stain inclined plate precipitation unit and the electric flocculation unit.
In order to prevent sewage short circuit, a first baffle 4 is arranged between the oil stain coalescence unit and the oil stain inclined plate sedimentation unit, a second baffle 19 is arranged between the electric flocculation unit and the suspended matter inclined plate sedimentation unit, and a third baffle 20 is arranged between the oil stain inclined plate sedimentation unit and the electric flocculation unit.
Oil drops and suspended particles in the oily sewage generally have negative charges, and can apply the action of an electric field to generate directional motion according to the charge property of the oil drops and the suspended particles. The oily sewage treatment device provided by the invention combines the processes of coalescence deoiling under an electric field, electric field adsorption deoiling and suspended matters, inclined plate precipitation, electric flocculation and the like. The greasy dirt removing part is mainly used for removing oil, more than 80% of greasy dirt in sewage can be removed through sewage treated by the greasy dirt removing part, the suspended matter removing part is mainly used for removing suspended matters, the sewage treated by the suspended matter removing part can be used for removing oil drops on the suspended matters and smaller grain sizes, and finally, the removing rate of the oil and the suspended matters in the sewage more than 95% can be realized.
In one example, the oil stain coalescing unit comprises an electrocoagulation filler 2, a perforated support plate 3 and an electrocoagulation cathode plate 8, wherein the electrocoagulation filler 2 is arranged at one end of the sewage treatment device, the water inlet 1 is positioned in the middle of the electrocoagulation filler 2, the perforated support plate 3 is positioned at the lower part of the electrocoagulation filler 2, the electrocoagulation filler 2 is connected with a positive electrode of a power supply (not shown), the electrocoagulation cathode plate 8 is positioned at the bottom of the sewage treatment device, and the electrocoagulation cathode plate 8 is connected with a negative electrode of the power supply.
In one example, the sewage treatment device further comprises a plurality of oil receiving grooves, and the oil receiving grooves are respectively arranged on the upper parts of the two ends of the sewage treatment device, the upper part of the first baffle 4 and/or the upper part of the second baffle 19. Preferably, the upper parts of the two ends of the sewage treatment device are respectively provided with an oil receiving groove 10 and an oil receiving groove 17, and the two sides of the upper part of the second baffle 19 are respectively provided with an oil receiving groove 11 and an oil receiving groove 18.
Specifically, the electrocoagulation filler 2 serves as an anode, and the electrocoagulation cathode plate 8 serves as a cathode. Preferably, the electrocoagulation cathode plate 8 is a stainless steel plate.
In one example, the electropolymerization bonding filler 2 comprises a plurality of layers of structures which are stacked with each other, each layer of structure comprises a frame body and barrier strips which are arranged on the frame body at intervals, the intervals of the barrier strips of each layer of structure are sequentially increased along the vertical direction, the arrangement directions of the barrier strips of the adjacent two layers of structures are different, and a supporting structure is arranged between the adjacent two layers of structures.
Preferably, the barrier strips are stainless steel strips. The frame body is made of stainless steel. The included angle of the arrangement directions of the barrier strips of the two adjacent layers of structures is 90 degrees or 45 degrees.
Oil drops with negative electricity in the sewage move towards the anode, namely the direction of the electrocoagulation packing 2, in an electric field formed by the electrocoagulation cathode plate 8 and the electrocoagulation packing 2. After the tiny oil drops are adsorbed on the electric aggregation filler 2, the tiny oil drops collide with each other and are aggregated, the particle size gradually increases, and the coarse granulation process is completed. After the oil drops are coalesced into large oil drops, the floating speed is accelerated, so that the oil-water separation is easy.
In one example, the oil stain inclined plate precipitation unit comprises a first electrified inclined plate 5, a first inclined plate electricity receiving groove 7 and a second inclined plate electricity receiving groove 6, wherein the first inclined plate electricity receiving groove 7 and the second inclined plate electricity receiving groove 6 are respectively arranged at two ends of the first electrified inclined plate 5, the first inclined plate electricity receiving groove 7 is connected with a power supply positive electrode, and the second inclined plate electricity receiving groove 6 is connected with a power supply negative electrode.
Preferably, the first electrified sloping plate 5 is made of stainless steel plate.
The oil drops after coarse granulation enter an oil stain inclined plate precipitation unit from the lower part of the electrocoagulation packing 2, and the floating of the oil drops can be accelerated because the upper part of the first charged inclined plate 5 is an anode and has upward attraction to the oil drops.
After the sewage is deoiled through the oil stain inclined plate precipitation unit, oil is enriched on the water surface and is collected through the oil collecting groove 10 and the oil collecting groove 11, and the sewage after deoiling can be in a sewage buffer area formed on the upper part of the oil stain inclined plate precipitation unit.
In one example, the bottom of the sewage treatment device below the oil removing part is of an opposite slope type, and a first sewage discharge port 9 is arranged at the lowest part of the slope.
The first sewage discharge port 9 is convenient for discharging deposited sludge or emptying sewage when the sewage treatment device is empty.
In one example, the electroflocculation unit comprises a first anode plate 12, a second anode plate 13, a first cathode plate 14 and a second cathode plate 15 arranged in sequence, the first anode plate 12 and the first cathode plate 14 are positioned on the third baffle plate 20, the second anode plate 13 and the second cathode plate 15 are positioned on the second baffle plate 19, and the four plates are arranged in a staggered manner.
Specifically, the first anode plate 12 and the second anode plate 13 are connected to the positive pole of the power supply, and the first cathode plate 14 and the second cathode plate 15 are connected to the negative pole of the power supply.
Preferably, the first anode plate 12 and the second anode plate 13 are made of aluminum plates, and the first cathode plate 14 and the second cathode plate 15 are made of stainless steel plates.
Preferably, the spacing between first anode plate 12 and second anode plate 13 is less than the spacing between first cathode plate 14 and second cathode plate 15. Such an arrangement may result in a better separation.
The four polar plates have an electric flocculation effect on the sewage. Sewage passes through the four pole plates in a Z shape, coagulation of the sewage is completed between the first anode plate 12 and the second anode plate 13, and flocculation is completed between the first cathode plate 14 and the second cathode plate 15. Suspended matters and oil drops with small particle sizes in the sewage form large alum flocs and oil drops through coagulation and flocculation, the settling and floating speeds are greatly increased, and the suspended matters and the oil drops are easy to remove from the water.
In one example, the suspended matter inclined plate sedimentation unit comprises a second electrified inclined plate 16, a third inclined plate electricity receiving groove 22 and a fourth inclined plate electricity receiving groove 23, wherein the third inclined plate electricity receiving groove 22 and the fourth inclined plate electricity receiving groove 23 are respectively positioned at two ends of the second electrified inclined plate 16, the third inclined plate electricity receiving groove 22 is connected with a negative electrode of a power supply, and the fourth inclined plate electricity receiving groove 23 is connected with a positive electrode of the power supply.
Preferably, the second charging slanting plate 6 is made of a stainless steel plate.
The sewage after the electric flocculation enters the suspended matter sloping plate sedimentation unit from the lower part of the second negative plate 15, and because the lower part of each group of sloping plate channels of the second electrified sloping plate 16 is the anode and suspended matter is generally negatively charged, the adsorption of the lower layer electrified sloping plate on the suspended matter is facilitated, and then the sedimentation of the suspended matter is accelerated, and the removal of the suspended matter is facilitated.
After the sewage passes through the suspended matter sloping plate sedimentation unit, the oil stain in the sewage floats to the water surface and is collected and removed through the oil collecting tank 17 and the oil collecting tank 18.
Preferably, the water outlet 21 is arranged below an oil stain layer formed after the suspended matter inclined plate sedimentation unit, so that oil stains and purified water after purification can be better separated.
In one example, the sludge settling concentration unit is funnel-shaped, and the bottom of the sludge settling concentration unit is provided with a second sewage outlet 24.
The suspended matters settled by the suspended matter inclined plate settling unit are further gathered and concentrated by the sludge settling and concentrating unit and finally discharged through the second sewage outlet 24.
To facilitate understanding of the solution of the present invention and its effects, an example is given below. It will be understood by those skilled in the art that this example is merely for the purpose of facilitating an understanding of the present invention and that any specific details thereof are not intended to limit the invention in any way.
Examples
As shown in fig. 1 and 2, the present invention provides an oily sewage treatment apparatus, comprising: the water inlet 1, the water outlet 21, the oil stain removing part and the suspended matter removing part; the oil stain removing part comprises an oil stain coalescing unit and an oil stain inclined plate settling unit, and a first baffle 4 is arranged between the oil stain coalescing unit and the oil stain inclined plate settling unit; the oil stain coalescence unit and the oil stain inclined plate precipitation unit are charged units; the suspended matter removing part comprises an electric flocculation unit, a suspended matter inclined plate sedimentation unit and a sludge sedimentation concentration unit, a second baffle plate 19 is arranged between the electric flocculation unit and the suspended matter inclined plate sedimentation unit, and the sludge sedimentation concentration unit is arranged at the lower part of the suspended matter inclined plate sedimentation unit; the electric flocculation unit and the suspended matter inclined plate sedimentation unit are both electrified units; a third baffle plate 20 is arranged between the oil stain inclined plate precipitation unit and the electric flocculation unit. The sewage treatment device further comprises a plurality of oil receiving grooves, wherein the upper parts of the two ends of the sewage treatment device are respectively provided with an oil receiving groove 10 and an oil receiving groove 17, and the two sides of the upper part of the second baffle plate 19 are respectively provided with an oil receiving groove 11 and an oil receiving groove 18.
The oil stain coalescing unit comprises an electrocoagulation filler 2, a support plate 3 with holes and an electrocoagulation cathode plate 8, wherein the electrocoagulation filler 2 is arranged at one end of the sewage treatment device, the water inlet 1 is positioned in the middle of the electrocoagulation filler 2, the support plate 3 with holes is positioned at the lower part of the electrocoagulation filler 2, the electrocoagulation filler 2 is connected with a positive electrode of a power supply, the electrocoagulation cathode plate 8 is positioned at the bottom of the sewage treatment device, the electrocoagulation cathode plate 8 is connected with a negative electrode of the power supply, and the electrocoagulation cathode plate 8 is a stainless steel plate; the electric coalescence filler 2 comprises a plurality of layers of structures which are stacked mutually, each layer of structure comprises a frame body and barrier strips which are arranged on the frame body at intervals, the intervals of the barrier strips of each layer of structure are sequentially increased along the vertical direction, the arrangement directions of the barrier strips of the adjacent two layers of structures are different, a supporting structure is arranged between the adjacent two layers of structures, the barrier strips are stainless steel strips, the frame body is made of stainless steel, and the included angle between the arrangement directions of the barrier strips of the adjacent two layers of structures is 90 degrees or 45 degrees; the oil stain inclined plate precipitation unit comprises a first electrified inclined plate 5, a first inclined plate electricity receiving groove 7 and a second inclined plate electricity receiving groove 6, wherein the first inclined plate electricity receiving groove 7 and the second inclined plate electricity receiving groove 6 are respectively positioned at two ends of the first electrified inclined plate 5, the first inclined plate electricity receiving groove 7 is connected with an upper inclined plate of an inclined plate channel and is connected with a power supply anode, the second inclined plate electricity receiving groove 6 is connected with a lower inclined plate of the inclined plate channel and is connected with a power supply cathode, and the first electrified inclined plate 5 is made of a stainless steel plate; the bottom of the sewage treatment device below the oil stain removing part is of a relative slope type, and a first sewage discharge port 9 is arranged at the lowest position of the slope.
The electrocoagulation unit comprises a first anode plate 12, a second anode plate 13, a first cathode plate 14 and a second cathode plate 15 which are sequentially arranged, wherein the first anode plate 12 and the first cathode plate 14 are positioned on a third baffle plate 20, the second anode plate 13 and the second cathode plate 15 are positioned on a second baffle plate 19, the four electrode plates are arranged in a staggered mode, the first anode plate 12 and the second anode plate 13 are made of aluminum plates, the first cathode plate 14 and the second cathode plate 15 are made of stainless steel plates, and the distance between the first anode plate 12 and the second anode plate 13 is smaller than the distance between the first cathode plate 14 and the second cathode plate 15; the suspended matter sloping plate sedimentation unit comprises a second electrified sloping plate 16, a third sloping plate electricity receiving groove 22 and a fourth sloping plate electricity receiving groove 23, the third sloping plate electricity receiving groove 22 and the fourth sloping plate electricity receiving groove 23 are respectively positioned at two ends of the second electrified sloping plate 16, the third sloping plate electricity receiving groove 22 is connected with an upper sloping plate of a sloping plate channel and is connected with a power supply cathode, the fourth sloping plate electricity receiving groove 23 is connected with a lower sloping plate of the sloping plate channel and is connected with a power supply anode, and the second electrified sloping plate 6 is made of a stainless steel plate; the sludge settling and concentrating unit is funnel-shaped, and a second sewage outlet 24 is arranged at the bottom of the sludge settling and concentrating unit.
In another aspect of the present invention, there is provided a method for treating wastewater, comprising the steps of:
oil stain coalescence treatment, wherein sewage enters the oil stain coalescence unit through the water inlet 1 and moves towards the positively charged electric coalescence filler 2 under the action of a micro electric field to realize coarse granulation of oil drops;
oil removing treatment, namely enabling oil drops to float upwards and enrich above the water surface in an accelerated manner by the sewage subjected to the oil stain coalescence treatment through an oil stain inclined plate precipitation unit, and collecting oil stains through an oil collecting tank;
coagulation flocculation treatment, namely enabling the sewage subjected to the oil removal treatment to enter the electric flocculation unit, and performing the coagulation flocculation treatment on suspended matters and residual oil stains in the sewage under the action of electric flocculation;
deoiling and suspended solid are handled, process the sewage that the flocculation and coagulation was handled passes through suspended solid swash plate subsides the unit and realizes that the suspended solid sinks with the come-up of residual greasy dirt with higher speed, and then makes sunken suspended solid passes through the concentrated unit discharge is subsided to mud, the residual greasy dirt is collected through receiving the oil groove, and the sewage after the purification passes through delivery port 21 discharges.
Specifically, during coagulation flocculation treatment, under the action of electric flocculation, the anode generates Al ions, and the coagulation flocculation treatment is carried out on suspended matters and residual oil stains in sewage.
Because oil drops and suspended particles in the oily sewage generally have negative charges, the oily sewage treatment method provided by the invention can generate directional motion by applying an electric field according to the charged property of the oily sewage, and further realize the adsorption of oil and suspended matters by the electric field.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments.
Claims (8)
1. An oily sewage treatment apparatus, characterized in that the apparatus comprises: the device comprises a water inlet (1), a water outlet (21), an oil stain removing part and a suspended matter removing part;
the oil stain removing part comprises an oil stain coalescing unit and an oil stain inclined plate settling unit, and a first baffle (4) is arranged between the oil stain coalescing unit and the oil stain inclined plate settling unit; the oil stain coalescence unit and the oil stain inclined plate precipitation unit are charged units;
the suspended matter removing part comprises an electric flocculation unit, a suspended matter inclined plate sedimentation unit and a sludge sedimentation concentration unit, a second baffle (19) is arranged between the electric flocculation unit and the suspended matter inclined plate sedimentation unit, and the sludge sedimentation concentration unit is arranged at the lower part of the suspended matter inclined plate sedimentation unit; the electric flocculation unit and the suspended matter inclined plate sedimentation unit are both electrified units;
a third baffle (20) is arranged between the oil stain inclined plate precipitation unit and the electric flocculation unit;
the oil stain accumulation unit comprises an electrocoagulation filler (2), a support plate (3) with holes and an electrocoagulation cathode plate (8), wherein the electrocoagulation filler (2) is arranged at one end of the sewage treatment device, the water inlet (1) is positioned in the middle of the electrocoagulation filler (2), the support plate (3) with holes is positioned at the lower part of the electrocoagulation filler (2), the electrocoagulation filler (2) is connected with a positive electrode of a power supply, the electrocoagulation cathode plate (8) is positioned at the bottom of the sewage treatment device, and the electrocoagulation cathode plate (8) is connected with a negative electrode of the power supply;
the electric coalescence filler (2) comprises a plurality of layers of structures which are stacked mutually, each layer of structure comprises a frame body and barrier strips arranged at intervals in the frame body, the intervals of the barrier strips of each layer of structure in the vertical direction are sequentially increased, the arrangement directions of the barrier strips of adjacent two layers of structures are different, and a supporting structure is arranged between the adjacent two layers of structures.
2. The oily sewage treatment device according to claim 1, wherein the oily inclined plate precipitation unit comprises a first electrified inclined plate (5), a first inclined plate electricity receiving groove (7) and a second inclined plate electricity receiving groove (6), the first inclined plate electricity receiving groove (7) and the second inclined plate electricity receiving groove (6) are respectively positioned at two ends of the first electrified inclined plate (5), the first inclined plate electricity receiving groove (7) is connected with a positive power supply electrode, and the second inclined plate electricity receiving groove (6) is connected with a negative power supply electrode.
3. The oily sewage treatment device according to claim 1, wherein the bottom of the sewage treatment device below the oil removing part is of an opposite slope type, and a first drain port (9) is arranged at the lowest part of the slope.
4. The oily sewage treatment device according to claim 1, wherein the electric flocculation unit comprises a first anode plate (12), a second anode plate (13), a first cathode plate (14) and a second cathode plate (15) which are arranged in sequence, the first anode plate (12) and the first cathode plate (14) are positioned on the third baffle plate (20), the second anode plate (13) and the second cathode plate (15) are positioned on the second baffle plate (19), and the four electrode plates are arranged in a staggered manner.
5. The oily sewage treatment device according to claim 1, wherein the suspended matter inclined plate sedimentation unit comprises a second electrified inclined plate (16), a third inclined plate electric receiving groove (22) and a fourth inclined plate electric receiving groove (23), the third inclined plate electric receiving groove (22) and the fourth inclined plate electric receiving groove (23) are respectively positioned at two ends of the second electrified inclined plate (16), the third inclined plate electric receiving groove (22) is connected with a negative electrode of a power supply, and the fourth inclined plate electric receiving groove (23) is connected with a positive electrode of the power supply.
6. The oily sewage treatment device according to claim 1, wherein said sludge settling concentration unit is funnel-shaped, and a second drain outlet (24) is arranged at the bottom of said sludge settling concentration unit.
7. The oily water treatment device according to claim 1, wherein the device further comprises a plurality of oil receiving grooves which are respectively arranged at the upper parts of two ends of the device, the upper part of the first baffle plate (4) and/or the upper part of the second baffle plate (19).
8. A sewage treatment method using the oily sewage treatment apparatus according to any one of claims 1 to 7, characterized by comprising the steps of:
oil stain coalescence treatment, wherein sewage enters the oil stain coalescence unit through the water inlet (1) and moves towards the electric coalescence filler (2) under the action of a micro electric field to realize coarse granulation of oil drops;
oil removing treatment, namely enabling oil drops to float upwards and enrich above the water surface in an accelerated manner by the sewage subjected to the oil stain coalescence treatment through an oil stain inclined plate precipitation unit, and collecting oil stains through an oil collecting tank;
coagulation flocculation treatment, namely enabling the sewage subjected to the oil removal treatment to enter the electric flocculation unit, and performing the coagulation flocculation treatment on suspended matters and residual oil stains in the sewage under the action of electric flocculation;
deoiling and suspended solid are handled, process the sewage that the flocculation and coagulation was handled passes through suspended solid swash plate subsides the unit and realizes that the suspended solid sinks with the come-up of residual greasy dirt with higher speed, and then makes the suspended solid that sinks passes through sludge settling concentration unit discharges, the residual greasy dirt is collected through receiving the oil groove, and the sewage after the purification passes through delivery port (21) are discharged.
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