CN113072146A - Electric flocculation oily sewage treatment device with hydrogen escape explosion-proof function - Google Patents
Electric flocculation oily sewage treatment device with hydrogen escape explosion-proof function Download PDFInfo
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- CN113072146A CN113072146A CN202110305931.2A CN202110305931A CN113072146A CN 113072146 A CN113072146 A CN 113072146A CN 202110305931 A CN202110305931 A CN 202110305931A CN 113072146 A CN113072146 A CN 113072146A
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- 238000005189 flocculation Methods 0.000 title claims abstract description 56
- 230000016615 flocculation Effects 0.000 title claims abstract description 51
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 239000001257 hydrogen Substances 0.000 title claims abstract description 47
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 47
- 239000010865 sewage Substances 0.000 title claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 133
- 238000000429 assembly Methods 0.000 claims abstract description 36
- 230000000712 assembly Effects 0.000 claims abstract description 36
- 238000000746 purification Methods 0.000 claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 238000004880 explosion Methods 0.000 claims abstract description 15
- 230000002265 prevention Effects 0.000 claims abstract description 14
- 239000006260 foam Substances 0.000 claims description 21
- 238000004062 sedimentation Methods 0.000 claims description 15
- 238000007667 floating Methods 0.000 claims description 12
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 238000009297 electrocoagulation Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000008213 purified water Substances 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 238000000034 method Methods 0.000 description 14
- 238000005188 flotation Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 239000012535 impurity Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
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- 238000005273 aeration Methods 0.000 description 3
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- 238000005265 energy consumption Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000002161 passivation Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 231100001240 inorganic pollutant Toxicity 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000012827 research and development 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
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- 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
-
- 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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
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- Chemical & Material Sciences (AREA)
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- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses an electric flocculation oily sewage treatment device with hydrogen escape and explosion prevention functions, which comprises a treatment shell, wherein a water storage tank, an electric flocculation area and a water purification area are arranged in the treatment shell; a plurality of cross polar plate electric flocculation devices are arranged in the electric flocculation area; the cross polar plate electric flocculation device comprises an outer shell, wherein a water storage area and a reaction area are arranged in the outer shell, and an even distributor is arranged between the water storage area and the reaction area; a plurality of groups of electrode assemblies are arranged in the reaction zone, each group of electrode assembly comprises two parallel electrode plates, and the electrode plates are parallel to the water inlet direction; the electrode plates in each group of electrode assemblies are connected with a pulse power supply; the upper part of the exhaust port above the water purification area is provided with a hydrogen escape explosion-proof device which can suck hydrogen and reduce the concentration of the hydrogen. According to the invention, the hydrogen escape explosion-proof device is arranged above the purification area, hydrogen and air are sucked by the double-inlet fan, the concentration of the hydrogen is reduced, the explosion-proof effect is achieved, and the safety degree of the device is high.
Description
Technical Field
The invention belongs to the technical field of oily sewage treatment, and particularly relates to an electric flocculation oily sewage treatment device with hydrogen escape and explosion prevention functions.
Background
At present, most of oil fields in China step into a tertiary oil recovery stage, and tertiary produced water has the characteristics of high temperature, high mineralization, multiple bacteria, multiple residual chemical agents and the like; meanwhile, polymers such as common polyacrylamide are required to be added into a well in the tertiary oil recovery process, so that the problems that tertiary produced water is high in viscosity and emulsification, strong in solid particle coagulation capacity, large in oil drop and solid particle movement resistance, large in consumption of chemical adsorbents and the like can be caused. At present, the methods commonly used in the oily sewage treatment technology comprise a physical method, a chemical method and a biological method, but the methods have the defects of high energy consumption, high cost, complex equipment, difficult maintenance and the like. Therefore, the oil-containing sewage treatment needs research and development of a new technology with high efficiency, energy conservation, economy and safety.
The electric flocculation is a high-efficiency and clean sewage treatment technology, and is mainly a sewage treatment technology which utilizes a soluble anode to release a large amount of cations under the action of an external electric field, hydrolyzes the cations to generate hydroxide and polynuclear hydroxyl complexes with strong adsorption effect, and flocculates impurity ions in the wastewater so as to remove pollutants. As an efficient and clean sewage treatment technology, the electric flocculation method combines the advantages of a chemical flocculation method and an electrochemical method for sewage treatment, and can remove pollutants more thoroughly and can remove inorganic pollutants and organic pollutants which cannot be treated by a common method.
The traditional electric flocculation device is easy to passivate, needs to be cleaned regularly and is difficult to expand the capacity; the problems of large occupied area, dead water area, small polar water ratio, high energy consumption and the like exist in the process of treating sewage with the same flow; meanwhile, in the existing electric flocculation device, hydrogen is generated when the oily sewage is electrolyzed by adopting an electric flocculation method, and the hydrogen is gathered after escaping from the top of the device and has explosion risk after being gathered to a certain concentration.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the electric flocculation oily sewage treatment device with the hydrogen escape and explosion prevention functions.
In order to achieve the purpose, the invention adopts the following technical scheme:
an electric flocculation oily sewage treatment device with hydrogen escape and explosion prevention functions comprises a treatment shell, wherein a water storage tank, an electric flocculation area and a water purification area are arranged in the treatment shell;
a water inlet used for being connected with a water inlet pipe is arranged on one side of the water storage tank, and a water outlet on the other side of the water storage tank is connected with a first water outlet pipe;
a plurality of cross electrode plate electric flocculation devices which are horizontally arranged are arranged in the electric flocculation area; the cross polar plate electric flocculation device comprises an outer shell, wherein a water inlet and a water outlet are respectively formed in two ends of the outer shell; a water storage area communicated with the water inlet and a reaction area communicated with the water outlet are arranged in the outer shell, and a uniform distributor is arranged between the water storage area and the reaction area;
a plurality of groups of electrode assemblies are arranged in the reaction zone along the water flow direction, each group of electrode assemblies comprises two parallel electrode plates, and the electrode plates are parallel to the water inlet direction; the electrode plates in each group of electrode assemblies are connected with a pulse power supply; the pulse power supply is arranged in a power supply placing area at the top of the processing shell;
the water inlet is connected with the first water outlet pipe; the water outlet is connected with a second water outlet pipe, and the other end of the second water outlet pipe is connected with a bottom inlet of the water purifying area;
the water purification area is internally provided with a forced air floating area, a grid plate sedimentation area and a foam capture area from bottom to top in sequence; a pressurized air floating device is arranged in the forced air floating area, a grid plate sedimentation device is arranged in the grid plate sedimentation area, and a foam catcher is arranged in the foam catching area; the upper part of the side surface of the purification area is provided with a purified water outlet; an overflow port is arranged on the side surface of the water purification area below the foam catcher and is communicated with the water storage tank through a sewage return pipe;
and the upper part of the exhaust port above the foam catcher is provided with a hydrogen escape explosion-proof device which can suck hydrogen and reduce the concentration of the hydrogen.
Preferably, the electrode assembly comprises a first electrode assembly, a second electrode assembly; the first electrode assembly and the second electrode assembly are alternately distributed along the water flow direction;
the distances between two parallel electrode plates in all the first electrode assemblies are equal, and the end faces of the electrode plates positioned on the same side in all the first electrode assemblies are coplanar;
the distances between the two parallel electrode plates in all the second electrode assemblies are equal, and the end faces of the electrode plates positioned on the same side in all the second electrode assemblies are coplanar;
a bisecting plane between the two electrode plates in the first electrode assembly intersects with a bisecting plane between the two electrode plates in the second electrode assembly.
Preferably, the electrode plate in the first electrode assembly is inclined to a side perpendicular to the direction of water flow; the electrode plate in the second electrode assembly is inclined to the other side perpendicular to the water flow direction.
Preferably, the electrode plate in the first electrode assembly is at an angle of 80 ° to the horizontal plane.
Preferably, the electrode plate in the second electrode assembly forms an angle of 80 ° with a horizontal plane.
Preferably, the distances between the two electrode plates in all the electrode assemblies are equal;
the vertical distances between adjacent electrode assemblies are equal;
the cross section and the thickness of each electrode plate are consistent.
Preferably, 4-8 horizontally arranged cross electrode plate electric flocculation devices are arranged in the electric flocculation area;
3-5 groups of electrode assemblies are arranged in the reaction zone along the water flow direction.
Preferably, the electrode plates are all made of aluminum materials; the outer shell is made of PVC materials.
Preferably, the hydrogen escaping explosion-proof device comprises a double-inlet fan, one inlet of the double-inlet fan is communicated with an air inlet pipe, the other inlet of the double-inlet fan is communicated with a tail gas absorption cover, and the tail gas absorption cover is positioned above the exhaust port;
and the outlet of the double-inlet fan is communicated with an exhaust pipe.
The invention has the beneficial effects that:
(1) according to the invention, the electric flocculation area adopts a plurality of cross electrode plate electric flocculation devices, so that the electric flocculation device can be freely assembled according to treatment requirements, and the cross electrode plate electric flocculation devices are adopted under the condition of the same floor area, and the electrode plate with the same area is arranged in an inclined and crossed manner in the application, so that compared with the traditional vertical electrode plate, the contact area between the electrode plate and sewage is increased by the electrode plate with the same area, so that the electrode-water ratio is increased, the current density is reduced, the overvoltage is reduced, and the voltage efficiency is improved; the contact area between the sewage and the electrode plate is increased, so that the volume of the sewage flowing through the unit time is increased, and the treatment efficiency is improved; meanwhile, the purpose of the alternate arrangement of the electrode plates is to enable water to pass through the electrode plates, so that the mobility of the water between the electrode plates is enhanced, and a dead water area is eliminated.
(2) According to the invention, the hydrogen escape explosion-proof device is arranged above the purification area, hydrogen and air are sucked by the double-inlet fan, the concentration of the hydrogen is reduced, the explosion-proof effect is achieved, and the safety degree of the device is high.
(3) The oily sewage electrocoagulation treatment and hydrogen leakage explosion-proof integrated device has high degree of integration, and because the two electrode plates with the same shape and the height of the inclined electrode plate is lower than that of the vertical electrode plate, the whole height of the device can be reduced by obliquely placing the electrode plates, so that the floor area of a large-scale device can be reduced, the manufacturing, installation and management of the device are simpler and faster, in addition, the proper number of cross electrode plate electrocoagulation devices can be selected according to actual needs, and the practicability is high.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic structural diagram of an electric flocculation oily sewage treatment device with hydrogen escape and explosion prevention functions of the invention;
FIG. 2 is a schematic plan view of the structure of an electric flocculation oily sewage treatment device with hydrogen escape and explosion prevention functions of the invention;
FIG. 3 is a schematic diagram of the structure of the electric flocculation device with crossed electrode plates in the invention;
FIG. 4 is a schematic view showing the internal structure of the cross-plate electroflocculation apparatus according to the present invention;
FIG. 5 is a schematic side view showing the structure of the hydrogen-evolving explosion-proof apparatus of the present invention;
FIG. 6 is a schematic plan view of the hydrogen evolution explosion-proof device according to the present invention;
wherein the content of the first and second substances,
1-a water storage tank, 101-a water inlet;
2-an electric flocculation area;
3-water purification area, 301-grid plate sedimentation device, 302-pressurized air flotation device, 303-foam catcher, 304-water purification discharge port and 305-exhaust port;
4-a first water outlet pipe;
5-a cross polar plate electric flocculation device, 501-an outer shell, 502-a water inlet, 503-a water outlet, 504-a water storage area, 505-a uniform distributor, 506-a polar plate and 507-a reaction area;
6-power source placement area;
7-hydrogen escape explosion-proof equipment, 701-tail gas absorption hood, 702-double-inlet fan, 703-air inlet pipe and 704-exhaust pipe;
8-a second water outlet pipe;
9-sewage return pipe.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "bottom", "top", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only terms of relationships determined for convenience in describing structural relationships of the components or elements of the present invention, and do not particularly indicate any components or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "connected" and "connecting" should be interpreted broadly, and mean either a fixed connection or an integral connection or a detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1-2, an electric flocculation oily sewage treatment device with hydrogen escape and explosion prevention functions comprises a treatment shell, wherein a water storage tank 1, an electric flocculation area 2 and a water purification area 3 are arranged in the treatment shell;
a water inlet 101 for connecting with a water inlet pipe is arranged at one side of the water storage tank 1, and a water outlet at the other side of the water storage tank 1 is connected with a first water outlet pipe 4;
a plurality of cross electrode plate electric flocculation devices 5 which are horizontally arranged are arranged in the electric flocculation area 2, the cross electrode plate electric flocculation devices 5 are horizontally arranged, the internal water pressure is low, and the requirement on the pressure resistance of a manufacturing material is reduced; as shown in fig. 3-4, the cross electrode plate electroflocculation apparatus 5 includes an outer shell 501, and a water inlet 502 and a water outlet 503 are respectively disposed at two ends of the outer shell 501; a water storage area 504 communicated with a water inlet 502 and a reaction area 507 communicated with a water outlet 503 are arranged in the outer shell 501, an uniform distributor 505 is arranged between the water storage area 504 and the reaction area 507, and water flow is uniformly distributed by the uniform distributor 505;
a plurality of groups of electrode assemblies are arranged in the reaction zone 507 along the water flow direction, each group of electrode assemblies comprises two parallel electrode plates 506, and the electrode plates 506 are parallel to the water inlet direction; the electrode plates 506 in each group of electrode assemblies are connected with a pulse power supply so as to realize the alternate conversion of the cathode and the anode of the two electrode plates 506 in each group of electrode assemblies, eliminate the defects of easy passivation, low efficiency and high energy consumption of direct current flocculation, and have good purification effect and low treatment cost; wherein an electric flocculation reaction zone is formed between the two electrode plates 506 in each group of electrode assemblies, and in the water flowing process, water flows between the two electrode plates 506 in each group of electrode assemblies in sequence, so that multi-stage electric flocculation can be performed; the pulse power supply is arranged in a power supply placing area 6 at the top of the treatment shell;
the water inlet 502 is connected with the first water outlet pipe 4; the water outlet 503 is connected with a second water outlet pipe 8, and the other end of the second water outlet pipe 8 is connected with the bottom inlet of the water purification area 3;
the water purification area 3 is internally provided with a forced air floating area, a grid plate sedimentation area and a foam capture area from bottom to top in sequence; a pressurized air flotation device 302 is arranged in the forced air flotation area, a grid plate sedimentation device 301 is arranged in the grid plate sedimentation area, and a foam catcher 303 is arranged in the foam catching area; the grid plate sedimentation device 301, the pressurized air flotation device 302 and the foam catcher 303 can be realized by adopting the existing design, for example, the grid plate sedimentation device (grid plate settler) can be composed of a plurality of grid plates which are parallel and form a certain angle, and the space between the adjacent grid plates is equal; the pressurizing air-floating device can comprise a pressurizing pump and an aeration pipeline connected with the pressurizing pump, and aeration holes are arranged on the aeration pipeline so as to inject air bubbles into the bottom of the purification area to strengthen the air-floating effect; a purified water outlet 304 is arranged at the upper part of the side surface of the purification area 3; an overflow port is arranged on the side surface of the water purification area below the foam catcher 303, and the overflow port is communicated with the water storage tank 1 through a sewage return pipe 9;
wherein, the upper part of the purifying area 3 is enclosed by an overflow plate body to form an overflow trough, the foam catcher 303 is positioned in the overflow trough, and the corresponding overflow port is correspondingly arranged at the overflow trough;
the upper part of the exhaust port 305 above the foam catcher 303 is provided with a hydrogen escape explosion-proof device 7 capable of sucking hydrogen gas and reducing the concentration of hydrogen gas.
Preferably, the electrode assembly comprises a first electrode assembly, a second electrode assembly; the first electrode assembly and the second electrode assembly are alternately distributed along the water flow direction;
the distances between the two parallel electrode plates 506 in all the first electrode assemblies are equal, and the end faces of the electrode plates positioned on the same side in all the first electrode assemblies are coplanar;
the distances between the two parallel electrode plates 506 in all the second electrode assemblies are equal, and the end faces of the electrode plates positioned on the same side in all the second electrode assemblies are coplanar;
a bisecting plane between the two electrode plates in the first electrode assembly intersects with a bisecting plane between the two electrode plates in the second electrode assembly.
Preferably, the electrode plate 506 in the first electrode assembly is inclined to a side perpendicular to the direction of water flow; the electrode plates 506 in the second electrode assembly are inclined to the other side perpendicular to the water flow direction.
Therefore, the arrangement of the first electrode assembly and the second electrode assembly forms the arrangement form of the inclined crossed electrode plates; compared with the traditional vertical electrode plate, the inclined crossed electrode plate has the advantages that the contact area of the electrode plate and sewage is increased under the condition of the electrode plate with the same area, so that the electrode-water ratio is increased, the current density is reduced, the overvoltage is reduced, and the voltage efficiency is improved. The first electrode assembly and the second electrode assembly are alternately arranged to enable water to penetrate through the electrode plates of each group, so that the mobility of the water between the electrode plates of each group is enhanced, and dead water areas are eliminated. Because the contact area between the sewage and the electrode plate is increased, the volume of the sewage flowing through the device per unit time is increased, the treatment efficiency is improved, and the overall height of the device is reduced. Compared with a cylindrical polar plate, the inclined crossed polar plate is convenient to mount and process, the generated floating bodies and flocs are easier to discharge from an outlet, each layer of the cylindrical polar plate is blocked, the space is narrow, the flocs are easy to accumulate in the cylinder and cannot be smoothly discharged, the voltage between the polar plates is too large, the flocs are accumulated to cause electrode passivation, and the floating bodies and the flocs between the inclined polar plates can float to the surface and precipitate to the bottom along the inclined polar plate, cannot be accumulated between the polar plates, and prevent the electrode passivation.
Preferably, the electrode plate 506 of the first electrode assembly is at an angle of 80 ° to the horizontal plane.
Preferably, the electrode plate 506 in the second electrode assembly is at an angle of 80 ° to the horizontal plane.
Experiments prove that the oil removal rate and the turbidity removal rate are highest when the included angle is 80 degrees, so that the 80-degree inclination angle is selected as the optimal inclination angle.
Preferably, the distances between the two electrode plates 506 are equal in all the electrode assemblies;
the vertical distances between adjacent electrode assemblies are equal;
the cross-section and thickness of each electrode plate 506 are uniform.
Preferably, 4-8 horizontally arranged cross polar plate electric flocculation devices 5 are arranged in the electric flocculation area 2;
3-5 groups of electrode assemblies are arranged in the reaction area 507 along the water flow direction.
Preferably, the electrode plates 506 are all made of aluminum materials; the outer housing 501 is made of PVC.
Preferably, as shown in fig. 5-6, the hydrogen-escaping explosion-proof device 7 comprises a double-inlet blower 702, one inlet of the double-inlet blower 702 is communicated with an air inlet pipe 703, the other inlet of the double-inlet blower 702 is communicated with a tail gas absorption hood 701, and the tail gas absorption hood 701 is positioned above the exhaust port 305;
the outlet of the double inlet fan 702 is communicated with an exhaust duct 704.
Specifically, the air inlet pipe 703 and the exhaust pipe 704 may be erected on the top of the process casing.
The double-inlet fan 702 sucks hydrogen and air, and mixes the hydrogen and the air exhausted from the exhaust port 305, so that the hydrogen concentration is reduced, and the explosion-proof effect is good; meanwhile, the integration degree is high, and the safety degree of the whole device is high.
An electric flocculation oily sewage treatment device with hydrogen escape and explosion prevention functions comprises the following specific implementation modes:
oily sewage flows into the water storage tank 1 through the water flow inlet 101, is static in the water storage tank 1, and a part of solid impurities and suspended matters are subjected to preliminary sedimentation separation, and the sewage after preliminary treatment enters the cross polar plate electric flocculation device 5 through the first water outlet pipe 4, so that the impurities in the oily sewage form a floc state through the electrolytic action of the electrode plate 506. Then the sewage containing the floc impurities flows out of the second water outlet pipe 8 and enters the purification area 3, and the floc impurities and the clear water are further separated by the grid plate sedimentation device 301. In order to promote the floating of floc impurities and avoid heavy workload in the later-stage sludge treatment process, a pressurizing air flotation device 302 is added below the grid plate sedimentation device 301, bubbles are pumped into the pressurizing air flotation device through a pressurizing pump, the air flotation effect is strengthened, the buoyancy of flocs is larger than the gravity, and the flocs float upwards. Along with the reaction, the sewage amount in the purification area 3 is continuously increased (at the moment, the purified water discharge port 304 is in a closed state), the liquid level is increased, when the liquid level reaches the height of the foam catcher 303, the foam and the floc on the upper layer are intercepted by the foam catcher 303, the oily sewage on the upper layer returns to the water storage tank 1 through the overflow port and the sewage return pipe 9 for carrying out the electric flocculation treatment again, and the water flow reaching the purification standard flows out from the purified water discharge port 304. In the whole treatment process, the double-inlet fan 702 sucks hydrogen and air, and mixes the hydrogen and the air exhausted from the exhaust port 305, so that the hydrogen concentration is reduced, and the explosion-proof effect is good; meanwhile, the integration degree is high, and the safety degree of the whole device is high.
Meanwhile, the whole arrangement of the electrode assemblies in the cross electrode plate electric flocculation device 5 eliminates a dead water area in the sewage treatment process; the electrode area is increased, and the current density is reduced, so that the overvoltage is reduced, and the voltage efficiency is improved. On the other hand, the arrangement form greatly increases the treatment flow of the water flow and the treatment capacity per unit time, and the purification effect is better than that of a common dynamic electric flocculation device.
The technical contents not mentioned in the above modes can be realized by adopting or referring to the prior art.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the present invention, and it should be understood by those skilled in the art that various modifications and changes may be made without inventive efforts based on the technical solutions of the present invention.
Claims (9)
1. An electric flocculation oily sewage treatment device with hydrogen escape and explosion prevention functions is characterized by comprising a treatment shell, wherein a water storage tank, an electric flocculation area and a water purification area are arranged in the treatment shell;
a water inlet used for being connected with a water inlet pipe is arranged on one side of the water storage tank, and a water outlet on the other side of the water storage tank is connected with a first water outlet pipe;
a plurality of cross electrode plate electric flocculation devices which are horizontally arranged are arranged in the electric flocculation area; the cross polar plate electric flocculation device comprises an outer shell, wherein a water inlet and a water outlet are respectively formed in two ends of the outer shell; a water storage area communicated with the water inlet and a reaction area communicated with the water outlet are arranged in the outer shell, and a uniform distributor is arranged between the water storage area and the reaction area;
a plurality of groups of electrode assemblies are arranged in the reaction zone along the water flow direction, each group of electrode assemblies comprises two parallel electrode plates, and the electrode plates are parallel to the water inlet direction; the electrode plates in each group of electrode assemblies are connected with a pulse power supply; the pulse power supply is arranged in a power supply placing area at the top of the processing shell;
the water inlet is connected with the first water outlet pipe; the water outlet is connected with a second water outlet pipe, and the other end of the second water outlet pipe is connected with a bottom inlet of the water purifying area;
the water purification area is internally provided with a forced air floating area, a grid plate sedimentation area and a foam capture area from bottom to top in sequence; a pressurized air floating device is arranged in the forced air floating area, a grid plate sedimentation device is arranged in the grid plate sedimentation area, and a foam catcher is arranged in the foam catching area; the upper part of the side surface of the purification area is provided with a purified water outlet; an overflow port is arranged on the side surface of the water purification area below the foam catcher and is communicated with the water storage tank through a sewage return pipe;
and the upper part of the exhaust port above the foam catcher is provided with a hydrogen escape explosion-proof device which can suck hydrogen and reduce the concentration of the hydrogen.
2. The apparatus for treating oil-containing sewage by electrocoagulation having a hydrogen-releasing explosion-proof function as set forth in claim 1, wherein said electrode assembly comprises a first electrode assembly, a second electrode assembly; the first electrode assembly and the second electrode assembly are alternately distributed along the water flow direction;
the distances between two parallel electrode plates in all the first electrode assemblies are equal, and the end faces of the electrode plates positioned on the same side in all the first electrode assemblies are coplanar;
the distances between the two parallel electrode plates in all the second electrode assemblies are equal, and the end faces of the electrode plates positioned on the same side in all the second electrode assemblies are coplanar;
a bisecting plane between the two electrode plates in the first electrode assembly intersects with a bisecting plane between the two electrode plates in the second electrode assembly.
3. The apparatus for treating oil-containing sewage by electrocoagulation with hydrogen evolution and explosion prevention functions as claimed in claim 2, wherein the electrode plate in the first electrode assembly is inclined to one side perpendicular to the direction of water flow; the electrode plate in the second electrode assembly is inclined to the other side perpendicular to the water flow direction.
4. The apparatus for treating oil-containing sewage by electrocoagulation with hydrogen evolution and explosion prevention functions as claimed in claim 3, wherein the angle between the electrode plate in the first electrode assembly and the horizontal plane is 80 °.
5. The apparatus for treating oil-containing sewage by electrocoagulation with hydrogen evolution and explosion prevention functions as claimed in claim 4, wherein the angle between the electrode plate in the second electrode assembly and the horizontal plane is 80 °.
6. The apparatus for treating oil-containing sewage by electrocoagulation with hydrogen evolution and explosion prevention functions as claimed in claim 1, wherein the distances between the two electrode plates in all the electrode assemblies are equal;
the vertical distances between adjacent electrode assemblies are equal;
the cross section and the thickness of each electrode plate are consistent.
7. The electro-flocculation oily sewage treatment device with the hydrogen escape and explosion prevention functions as claimed in claim 1, wherein 4-8 horizontally arranged cross electrode plate electro-flocculation devices are arranged in the electro-flocculation area;
3-5 groups of electrode assemblies are arranged in the reaction zone along the water flow direction.
8. The electro-flocculation oily sewage treatment device with the hydrogen-escaping and explosion-proof functions as claimed in claim 1, wherein the electrode plates are all made of aluminum material; the outer shell is made of PVC materials.
9. The electro-flocculation oily sewage treatment device with the hydrogen escape and explosion-proof function as claimed in claim 1, wherein the hydrogen escape and explosion-proof device comprises a double-inlet fan, one inlet of the double-inlet fan is communicated with an air inlet pipe, the other inlet of the double-inlet fan is communicated with a tail gas absorption cover, and the tail gas absorption cover is positioned above an exhaust port;
and the outlet of the double-inlet fan is communicated with an exhaust pipe.
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