CN112979012A - Oily wastewater treatment device integrating coagulation, electric floatation and electrooxidation - Google Patents
Oily wastewater treatment device integrating coagulation, electric floatation and electrooxidation Download PDFInfo
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- 230000015271 coagulation Effects 0.000 title claims abstract description 31
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 25
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 21
- 230000009471 action Effects 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 18
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 239000000126 substance Substances 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 229910001220 stainless steel Inorganic materials 0.000 claims description 15
- 239000010935 stainless steel Substances 0.000 claims description 15
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 12
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- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 10
- 239000000084 colloidal system Substances 0.000 claims description 9
- 238000007254 oxidation reaction Methods 0.000 claims description 9
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- CJTCBBYSPFAVFL-UHFFFAOYSA-N iridium ruthenium Chemical compound [Ru].[Ir] CJTCBBYSPFAVFL-UHFFFAOYSA-N 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
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Images
Classifications
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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
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
- C02F1/385—Treatment of water, waste water, or sewage by centrifugal separation by centrifuging suspensions
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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
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
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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
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F1/46114—Electrodes in particulate form or with conductive and/or non conductive particles between them
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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
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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
- C02F1/465—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electroflotation
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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
- C02F1/5281—Installations for water purification using chemical agents
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46152—Electrodes characterised by the shape or form
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
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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
- 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
- C02F2201/4616—Power supply
- C02F2201/4617—DC only
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses an oily wastewater treatment device integrating coagulation, electric floatation and electrooxidation, which comprises a shell, an insulating layer, three metal rings, an electrode reaction component and a vortex generator, wherein the three metal rings form concentric circles from inside to outside, the outer ring is fixedly attached in the insulating layer, the lower ends of the middle ring and the outer ring are sealed to form a first ring cavity, the first ring cavity is an electrooxidation reaction cavity III, the electrode reaction component comprises an electrode clamping groove in a ring structure and an electrode embedded in the electrode clamping groove, the two surfaces of the electrode respectively form an anode and a cathode under the induction action of a second electric field, the second ring cavity area where the electrode is located is an electrolysis reaction area I, and the area above the electrode forms a contact area II; and the swirl generator is arranged below the electrolysis reaction zone I and is arranged right below the electrode. Compared with the existing treatment means, the method has the advantages of less dosage of the added medicament, low treatment cost, small sludge production amount and the like.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an oily wastewater treatment device integrating coagulation, electric floatation and electrooxidation.
Background
At present, the quantity of kitchen waste in China is increased year by year, and the pollution to the environment is increased more and more.
The kitchen waste is the most common waste generated in daily life in cities, belongs to the municipal domestic waste, and mainly comes from catering service industry, dining halls of enterprises and public institutions, food processing enterprises, municipal sewers, oil separation tanks, resident families and the like.
The kitchen waste mainly contains organic matters such as starch, cellulose, protein, animal and vegetable oil and the like. If the harmful substances such as pathogenic bacteria and the like cannot be treated in time, the harmful substances are easy to deteriorate and breed, and then a large amount of toxic and malodorous gases are generated, so that the health and the life quality of people are seriously influenced.
The resource utilization and harmless treatment of the kitchen waste are the necessary ways for developing circular economy, maintaining urban environment and guaranteeing the health of citizens. The problem that the illegal cooking oil returns to the dining table is radically solved from the source, and the life health and safety of people are protected; is beneficial to environmental protection; the garbage recycling is facilitated, harmlessness and recycling are realized, energy conservation and emission reduction are promoted, and circular economy is developed.
At present, the kitchen waste treatment is still in a pilot stage nationwide, as a new industry, no very mature project and process technology can be used for reference nationwide, solutions can be found everywhere according to local conditions, and experience is continuously accumulated and gradually improved in practice. Along with the increase of kitchen garbage collection handling capacity in the journey of moving, treatment process, preliminary treatment equipment, exhaust-gas treatment, kitchen waste water treatment problem are increasingly prominent, and this patent will synthesize the above problem of solving.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the invention is to provide an oily wastewater treatment device integrating coagulation, electric floatation and electrooxidation, and the oily wastewater treatment device is designed to solve the problems of complex wastewater pollutants, high oil pollutant content, high consumption of coagulation agents and more difficultly-degradable organic matters in an oil-containing plant.
In order to solve the technical problem, the invention is realized by the following scheme: the invention relates to an oily wastewater treatment device integrating coagulation, electric floatation and electrooxidation, which comprises a shell, an insulating layer arranged in the shell and also comprises:
three metal rings which are concentric circles are formed from inside to outside, wherein the outer ring is fixedly attached in the insulating layer, the lower ends of the middle ring and the outer ring are sealed to form a first ring cavity, the first ring cavity is an electro-oxidation reaction cavity III, a second ring cavity is formed between the middle ring and the inner ring, and the middle ring and the outer ring are respectively electrically connected with the positive electrode and the negative electrode of a direct-current power supply to form a first electric field in the first ring cavity; the middle ring and the inner ring are respectively electrically connected with the anode and the cathode of a direct current power supply so as to form a second electric field in the second ring cavity;
the electrode reaction assembly is arranged at the lower part of the second annular cavity in a surrounding mode through an insulating support and comprises an electrode clamping groove of an annular structure and an electrode embedded on the electrode clamping groove, under the induction action of a second electric field, an anode and a cathode are respectively formed on two surfaces of the electrode, the second annular cavity area where the electrode is located is an electrolysis reaction area I, and the area, above the electrode, of the second annular cavity forms a contact area II;
and the swirl generator is arranged below the electrolysis reaction zone I and is arranged right below the electrode.
Furthermore, a particle electrode is thrown into the wastewater of the first ring cavity and is placed into the first ring cavity through a plastic grid plate forming a grid.
Furthermore, the particle electrode is activated carbon doped with ferric oxide and uniformly mixed.
Further, the electrode is an aluminum ring electrode or an iron ring electrode.
Further, the shell is a stainless steel shell which is of a cylindrical structure, a precipitation tank communicated with the second annular cavity is formed at the bottom of the shell, and the precipitation tank is connected with a drain pipe.
Furthermore, the water inlet pipe introduces waste water from the outside into the lower part of the second annular cavity, the vortex generator is arranged at the water outlet of the water inlet pipe, and the water outlet pipe is arranged at the relative position of the water outlet direction of the water inlet pipe.
Furthermore, a dosing port and a pH value detector are respectively arranged in the second annular cavity and in the area II of the contact area.
Furthermore, the top of the shell is also provided with a movable scraper blade to scrape the scum on the water surface out of the device.
Furthermore, the metal ring is a stainless steel ring.
Further, after the wastewater is added into the second ring cavity and in the electrolytic reaction area I, after the middle ring and the inner ring are electrified, the electrode forms an anode and a cathode, the surface of the anode is corroded to generate metal ions, the metal ions are further hydrolyzed to form a hydroxyl complex, and colloid with adsorption property is generated; meanwhile, hydrogen evolution and oxygen evolution reactions also exist on the surfaces of the cathode and the anode of the electrode, so that a large amount of bubbles can be generated, and an air floatation effect is formed;
the contact area II is used for forming rotational flow in the wastewater in the second annular cavity under the action of the rotational flow generator so as to increase the contact probability of the colloid and suspended particles in the wastewater, the suspended particles and the bubbles, and the bubbles and oil drops in the wastewater, meanwhile, under the action of eccentricity, the oil drops and the bubbles in the wastewater are gathered to the center so as to separate oil from water, scum on the water surface is scraped out through a scraper, and the treated wastewater flows into the next process;
an electrooxidation reaction chamber III, a particle electrode is thrown into the first annular chamber, and the particles areThe electrode is activated carbon doped with ferric oxide, the particle electrode increases the conductivity of the wastewater, the activated carbon provides a large number of reaction sites and reduces mass transfer resistance, under the action of the first electric field, a cathode and an anode are formed on the surface of the particle electrode, organic matters in the wastewater are subjected to oxidation reaction on the surface of the anode, or strong oxidizing substances are generated on the surface of the particle electrode, and the strong oxidizing substances comprise Cl2、H2O2Containing O2 -One or more than two substances of the compound degrade organic matters through the strong oxidizing substances, and meanwhile, a plurality of micro-electrolysis reactions exist in the activated carbon, so that the electrolysis efficiency is further improved.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the existing treatment means, the oily wastewater treatment device integrating coagulation, electric floatation and electrooxidation has the advantages of small dosage of added chemicals, low treatment cost, small sludge production amount, simple process, easy control of operation, short hydraulic retention time, good treatment effect and the like.
2. Compared with the existing air floatation process, the method has the advantages of reducing the retention time, reducing the treatment cost, and simultaneously reducing an air compressor, a pressurized dissolved air pump and a dissolved air tank.
3. The device of the invention adopts an electrooxidation method to replace a chemical oxidation method, thereby not only improving the treatment efficiency and effect, but also reducing the use of chemical agents and solving the problems of agent transportation, agent storage and the like.
4. The device of the invention has no secondary pollution.
Drawings
FIG. 1 is a plan view of an oily wastewater treatment apparatus of the present invention.
FIG. 2 is a side sectional view of the oily wastewater treatment apparatus of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and thus the protection scope of the present invention is more clearly and clearly defined. It should be apparent that the described embodiments of the present invention are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1: the concrete structure of the invention is as follows:
referring to fig. 1-2, the oily wastewater treatment device of the present invention, which integrates coagulation, electric flotation and electric oxidation, has an integrated structure, and comprises a housing 4, an insulating layer 3 disposed in the housing 4, and further comprises:
three metal rings 1 which form concentric circles from inside to outside, wherein the outer ring is fixedly attached in the insulating layer 3, the lower ends of the middle ring and the outer ring are sealed to form a first ring cavity, the first ring cavity is an electro-oxidation reaction cavity III, a second ring cavity is formed between the middle ring and the inner ring, and the middle ring and the outer ring are respectively and electrically connected with the positive electrode and the negative electrode of a direct-current power supply 7 to form a first electric field in the first ring cavity; the middle ring and the inner ring are respectively electrically connected with the anode and the cathode of a direct current power supply 7 to form a second electric field in the second ring cavity;
the electrode reaction component is annularly arranged at the lower part of the second annular cavity through an insulating support 5 and comprises an electrode clamping groove 2 with an annular structure and an electrode 10 embedded on the electrode clamping groove 2, under the induction action of a second electric field, an anode and a cathode are respectively formed on two surfaces of the electrode 10, the second annular cavity area where the electrode 10 is located is an electrolytic reaction area I, and the area of the second annular cavity above the electrode 10 forms a contact area II;
and the swirl generator 9 is arranged below the electrolysis reaction zone I and is arranged right below the electrode 10.
A preferred technical solution of this embodiment: a particle electrode 6 is thrown into the wastewater of the first ring cavity, and the particle electrode 6 is placed into the first ring cavity through a plastic grid plate 16 forming a grid.
A preferred technical solution of this embodiment: the particle electrode 6 is activated carbon doped with ferric oxide and uniformly mixed.
A preferred technical solution of this embodiment: the electrode 10 is an aluminum ring electrode or an iron ring electrode.
A preferred technical solution of this embodiment: the shell 4 is a stainless steel shell which is of a cylindrical structure, a precipitation tank 11 communicated with the second annular cavity is formed at the bottom of the shell 4, and the precipitation tank 11 is connected with a sewage discharge pipe 12.
A preferred technical solution of this embodiment: still include an inlet tube 8 and an outlet pipe 17, this inlet tube 8 is introduced waste water from the outside and is got into second ring cavity lower part, whirl generator 9 install in the delivery port of inlet tube 8, outlet pipe 17 set up in the relative position of 8 play water directions of inlet tube.
A preferred technical solution of this embodiment: and a dosing port 13 and a pH value detector 14 are respectively arranged in the second annular cavity and in the area of the contact area II.
A preferred technical solution of this embodiment: the top of the housing 4 is also provided with a movable scraper 15 to scrape the water scum out of the device.
A preferred technical solution of this embodiment: the metal ring 1 is a stainless steel ring.
Example 2:
the functions of an electrolytic reaction area I, a contact area II and an electrooxidation reaction cavity III of the oily wastewater treatment device integrating coagulation, electrofloatation and electrooxidation are as follows:
after the wastewater is added into the second ring cavity, in the electrolytic reaction area I, after the middle ring and the inner ring are electrified, the electrode 10 forms an anode and a cathode, the surface of the anode is corroded to generate metal ions, and the metal ions are further hydrolyzed to form a hydroxyl complex compound to generate colloid with adsorption property; meanwhile, hydrogen evolution and oxygen evolution reactions also exist on the surfaces of the cathode and the anode of the electrode 10, so that a large amount of bubbles can be generated, and an air floatation effect is formed;
a contact area II, under the action of the swirl generator 9, the wastewater in the second annular cavity forms a swirl to increase the contact probability of the colloid and suspended particles in the wastewater, the suspended particles and the bubbles, and the bubbles and oil drops in the wastewater, meanwhile, under the action of eccentricity, the oil drops and the bubbles in the wastewater are gathered to the center, so that oil and water are separated, scum on the water surface is scraped out through a scraper 15, and the treated wastewater flows into the next process;
the electrooxidation reaction cavity III is characterized in that a particle electrode 6 is thrown into a first annular cavity, the particle electrode 6 is activated carbon doped with ferric oxide, the particle electrode 6 increases the conductivity of the wastewater, the activated carbon provides a large number of reaction sites and reduces the mass transfer resistance, and under the action of the first electric field, the surface of the particle electrode 6 is formedThe organic matters in the waste water are oxidized on the surface of the anode or strong oxidizing substances are generated on the surface of the particle electrode 6, wherein the strong oxidizing substances comprise Cl2、H2O2Containing O2 -One or more than two substances of the compound degrade organic matters through the strong oxidizing substances, and meanwhile, a plurality of micro-electrolysis reactions exist in the activated carbon, so that the electrolysis efficiency is further improved.
Example 3:
the working principle of the oily wastewater treatment device integrating coagulation, electric floatation and electrooxidation is as follows:
oily wastewater enters the integrated treatment device from the water inlet pipe 8, and the wastewater rotates and rises in the reactor under the action of the vortex generator 9.
Waste water gets into electrolysis reaction district I, places two stainless steel rings that link to each other with DC power supply 7 in this region, and middle ring and inlayer ring interval are 40 ~ 60cm, are provided with aluminium or iron induction electrode between middle ring and the inlayer ring, and aluminium or iron induction electrode interval is 5 ~ 10 cm.
Turning on the DC power supply, and adjusting the current density of the stainless steel electrode to 10A/m2～100A/m2At this time, a second electric field is generated between the stainless steel rings, so that the aluminum or iron electrode surface forms a cathode and an anode, respectively. On the surface of the anode, aluminum or iron electrodes are corroded to generate aluminum or iron ions, a series of hydroxyl complexes are formed through hydrolysis reaction, and the hydroxyl complexes provide carriers for adsorbing suspended particles and oil drops in wastewater. Meanwhile, under the hydrogen and oxygen evolution reaction of the aluminum or iron induction electrode, a large number of micro bubbles are generated, and an air floatation condition is created. The residence time of the whole electrolytic reaction is 10-15 min, and the electrolyzed wastewater enters the contact area II.
In the contact area II, a pH value detector 14 is arranged, so that the pH value of the wastewater in the reactor can be detected in real time, and the proper pH value is adjusted manually, so that the coagulation effect of the wastewater is ensured.
According to the water quality, if the effluent needs to reach the SS index, a small amount of polymeric flocculant medicament can be properly added into the wastewater through the medicament adding port 13. Under the action of liquid rotational flow, adsorption colloid generated by hydrolysis of aluminum or iron ions, flocculating agent added from outside, suspended particles in wastewater, oil substances and micro bubbles generated by electrolysis collide with each other to form particle floc-bubble and bubble-oil drop combinations, and due to centrifugal force generated by wastewater rotational flow, the micro bubbles collide with each other under the action of centrifugal force to form particle floc-bubble and bubble-oil drop combinations which are gathered towards the center and rise to the water surface, and finally are scraped out by a scraper 15 to achieve the purpose of solid-liquid separation. The reaction time of the whole contact area II is 40-60 min, and the treated wastewater overflows to a third treatment unit, namely an electrooxidation reaction area III.
In the electro-oxidation reaction zone III, two stainless steel rings connected with a direct-current power supply are also placed, wherein one stainless steel ring is a middle ring, the middle ring is a shared ring, and the distance between the middle ring and the outer ring is 20-50 cm.
Activated carbon particles which are 50-500 meshes, doped with ferric oxide and uniformly mixed are filled between the middle ring and the outer ring, the filling rate of the activated carbon particles is 40-80%, and the activated carbon particles are fixed in the first ring cavity through the plastic grid plate 16. Turning on a direct current power supply, and adjusting the electrode current density of the middle ring and the outer ring to be 40A/m2～400A/m2And carrying out electrooxidation reaction. On one hand, the organic matter is directly oxidized and degraded on the surface of the stainless steel anode or the particle electrode 6; on the other hand, organic substances are formed into Cl on the surface of the electrode2、H2O2、·O2 -And the like, and indirectly oxidize the substances with strong oxidizing property. The active carbon particles doped with ferric oxide are used as particle electrodes, so that the conductivity of the wastewater is improved, a plurality of reaction interfaces are improved for the electrooxidation reaction, the mass transfer resistance is reduced, the electrooxidation reaction efficiency is improved, and the problems of high electrooxidation energy consumption and the like are solved. The residence time of the electrooxidation reaction zone is 2-3 h. After the electro-oxidation treatment, the wastewater reaching the discharge standard can be discharged through the water outlet pipe 17.
Example 4:
the invention relates to a device for treating oily wastewater, which integrates electric coagulation, electric floatation and electric oxidation to treat oily plant wastewater and comprises the following steps:
step one, carrying out demulsification treatment on the oily wastewater treated by the oil separation tank, and then feeding the oily wastewater into an integrated electrochemical treatment device through a water inlet pipe 8;
step two, the oily wastewater enters an electrolytic reaction area I through a vortex generator 9, aluminum rings are inserted into an electrode clamping groove 2, the distance between every two aluminum rings is 5cm, and the current density is adjusted to be 10A/m2Electrolyzing for 10 min;
step three, the electrolyzed wastewater enters a contact zone II, the pH value is adjusted to 7, and 2mg/L polyacrylamide solution is added;
under the action of rotational flow, aluminum hydroxide colloid, polymeric flocculant, suspended particles, oil drops and micro bubbles are fully contacted, and rise to the water surface to form floating slag which is scraped out by a scraper;
step five, the effluent after air floatation flows into an electro-oxidation reaction zone III, 60 percent of 200-mesh doped ferric oxide activated carbon particles are filled between the first ring cavities, and the current density is adjusted to be 200A/m2And electrolyzing for 2 hours.
The oily wastewater treatment device integrating coagulation, electro-flotation and electro-oxidation in the embodiment treats oily wastewater, and the removal rate of oil substances and the removal rate of COD in the oily wastewater are 95% and 92%.
Example 5:
the oily wastewater treatment device integrating coagulation, electric floatation and electrooxidation is used for treating oily plant wastewater, and comprises the following steps:
step one, carrying out demulsification treatment on the oily wastewater treated by the oil separation tank, and then feeding the oily wastewater into an integrated electrochemical treatment device through a water inlet pipe 8;
step two, the oily wastewater enters an electrolytic reaction area I through a vortex generator 9, aluminum rings are inserted into an electrode clamping groove 2, the distance between every two aluminum rings is 5cm, and the current density is adjusted to be 20A/m2Electrolyzing for 10 min;
step three, the electrolyzed wastewater enters a contact zone II, the pH value is adjusted to 7, and 4mg/L polyacrylamide solution is added;
under the action of rotational flow, aluminum hydroxide colloid, polymeric flocculant, suspended particles, oil drops and micro bubbles are fully contacted, and rise to the water surface to form floating slag which is scraped out by a scraper;
step five, the effluent after air floatation flows into an electro-oxidation reaction zone III, 60 percent of 200-mesh doped ferric oxide activated carbon particles are filled between stainless steel circular rings, and the current density is adjusted to 400A/m2And electrolyzing for 2 hours.
In the embodiment, the electrochemical water treatment device integrating coagulation, air flotation and electrooxidation is used for treating the oily wastewater, the removal rate of oil substances in the oily wastewater is 98%, and the removal rate of COD is 96%.
In conclusion, the oily wastewater treatment device integrating coagulation, electric floatation and electric oxidation has the innovation points that:
1. the device is an electrochemical water treatment device integrating an electrolysis reaction zone I, a contact zone II and an electrooxidation reaction zone III, and particularly relates to three water treatment processes of electrocoagulation, electroflotation and electrooxidation. Wherein the electrolysis reaction zone I is a first-stage treatment unit and mainly provides aluminium hydroxide, ferric hydroxide or other coagulants and a large number of micro bubbles. The contact zone II is used as a second treatment unit, and provides sufficient contact time and space for coagulant, suspended particles, oil drops and micro-bubbles at the upper part of the electrolysis reaction zone I. And the electrooxidation reaction zone III is a third-stage treatment unit and is mainly used for removing organic matters which are difficult to degrade in the wastewater through electrooxidation oxidation. The wastewater that eventually meets the discharge standards can be discharged to the environment.
2. The invention adopts the electric coagulation and the electric float method to replace the traditional coagulation/air float method, reduces the use of coagulation agents, saves equipment such as an air compressor, a pressurized dissolved air pump, a dissolved air tank and the like, and has the advantages of simple operation, small floor area, small production amount of tail mud and the like. In the electrolytic reaction process, the cathode and the anode are stainless steel rings, and the aluminum and iron electrodes are used as induction electrodes, so that the electrodes can be replaced conveniently, and meanwhile, the cathode and the anode can be reversely connected periodically to solve the problem of Ca2+，Mg2+The plasma adheres to the cathode to lower the electrolysis efficiency.
3. The invention adds a rotational flow process in the process of electric coagulation/electric air floatation, thereby not only improving the collision probability, but also generating centrifugal force, promoting the oil-water separation and improving the air floatation effect.
4. Compared with a chemical oxidation method, the electrochemical oxidation method has the advantages of no need of adding an oxidant, easy reaction control, high treatment efficiency and the like, and solves the problems of difficult transportation and storage of the oxidant and the like. In the process of the electro-oxidation reaction, the cathode and the anode also use stainless steel circular rings, and compared with commonly used ruthenium iridium and lead dioxide electrodes, the anode has the advantages of long service life, low cost and the like. Meanwhile, the cathode and the anode can be reversed periodically for cleaning the electrodes, so that the electrolysis efficiency is improved.
5. According to the invention, the active carbon doped with ferric oxide is used as the particle electrode, so that the transfer efficiency of electrons is improved, the energy consumption is reduced, a plurality of micro-electrolysis reaction surfaces are provided, the mass transfer resistance is reduced, and the electrolysis efficiency is greatly improved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. Oily effluent treatment plant of collection electricity coagulation, electric superficial and electrooxidation in an organic whole, include shell (4), locate shell (4) internal insulation layer (3), its characterized in that still includes:
three metal circular rings (1) which form concentric circles from inside to outside, wherein the outer circular ring is fixedly attached in the insulating layer (3), the lower ends of the middle circular ring and the outer circular ring are sealed to form a first circular cavity, the first circular cavity is an electro-oxidation reaction cavity III, a second circular cavity is formed between the middle circular ring and the inner circular ring, and the middle circular ring and the outer circular ring are respectively electrically connected with the positive electrode and the negative electrode of a direct current power supply (7) to form a first electric field in the first circular cavity; the middle ring and the inner ring are respectively and electrically connected with the positive electrode and the negative electrode of a direct current power supply (7) to form a second electric field in the second ring cavity;
the electrode reaction component is annularly arranged at the lower part of the second annular cavity through an insulating support (5) and comprises an electrode clamping groove (2) with an annular structure and an electrode (10) embedded on the electrode clamping groove (2), under the induction action of a second electric field, the two surfaces of the electrode (10) respectively form an anode and a cathode, the second annular cavity area where the electrode (10) is located is an electrolytic reaction area I, and the area of the second annular cavity above the electrode (10) forms a contact area II;
and the swirl generator (9) is arranged below the electrolysis reaction zone I and is arranged right below the electrode (10).
2. The oily wastewater treatment device integrating coagulation, electric flotation and electrooxidation as claimed in claim 1 wherein the wastewater of the first ring cavity is thrown with particle electrodes (6), and the particle electrodes (6) are put into the first ring cavity through plastic grid plates (16) forming grids.
3. The oily wastewater treatment device integrating coagulation, electro-flotation and electro-oxidation according to claim 2, wherein the particle electrode (6) is activated carbon doped with iron oxide and uniformly mixed.
4. The oily wastewater treatment device integrating coagulation, electro-flotation and electro-oxidation according to claim 1, wherein the electrode (10) is an aluminum ring electrode or an iron ring electrode.
5. The oily wastewater treatment device integrating coagulation, electric flotation and electrooxidation as claimed in claim 1 wherein the shell (4) is a stainless steel shell which is in a cylindrical structure, a settling tank (11) communicated with the second annular cavity is formed at the bottom of the shell (4), and the settling tank (11) is connected with a drain pipe (12).
6. The oily wastewater treatment device integrating coagulation, electric flotation and electrooxidation as claimed in claim 1 further comprising a water inlet pipe (8) and a water outlet pipe (17), wherein the water inlet pipe (8) introduces wastewater from the outside into the lower part of the second annular cavity, the swirl generator (9) is installed at the water outlet of the water inlet pipe (8), and the water outlet pipe (17) is arranged at a relative position of the water outlet direction of the water inlet pipe (8).
7. The oily wastewater treatment device integrating coagulation, electric flotation and electrooxidation as claimed in claim 1 wherein a dosing port (13) and a pH value detector (14) are respectively arranged in the second annular cavity and in the area of the contact zone II.
8. The device for treating oily wastewater by current collection coagulation, electric floatation and electric oxidization as claimed in claim 1, wherein a movable scraper (15) is further provided on the top of the housing (4) to scrape the scum from the water surface out of the device.
9. The oily wastewater treatment device integrating coagulation, electro-flotation and electro-oxidation according to any one of claims 1 to 8, wherein the metal ring (1) is a stainless steel ring.
10. The oily wastewater treatment device integrating coagulation, electro-flotation and electro-oxidation as claimed in claim 1, wherein after wastewater is added into the second ring cavity, in the electrolysis reaction zone I, after the middle ring and the inner ring are electrified, the electrode (10) forms an anode and a cathode, the surface of the anode is corroded to generate metal ions, and the metal ions are further hydrolyzed to form a hydroxyl complex, so that colloid with adsorption property is generated; meanwhile, hydrogen evolution and oxygen evolution reactions also exist on the surfaces of the cathode and the anode of the electrode (10), so that a large amount of bubbles can be generated, and an air floatation effect is formed;
the contact area II is used for forming rotational flow by the wastewater in the second annular cavity under the action of the rotational flow generator (9) so as to increase the contact probability of the colloid and suspended particles in the wastewater, the suspended particles and the bubbles, and the bubbles and oil drops in the wastewater, meanwhile, under the action of eccentricity, the oil drops and the bubbles in the wastewater are gathered to the center so as to separate oil from water, scum on the water surface is scraped out through a scraper (15), and the treated wastewater flows into the next process;
an electrooxidation reaction cavity III is provided with a particle electrode (6) in a first annular cavity, the particle electrode (6) is activated carbon doped with ferric oxide, the particle electrode (6) increases the conductivity of the wastewater, the activated carbon provides a large number of reaction sites and reduces mass transfer resistance, under the action of the first electric field, a cathode and an anode are formed on the surface of the particle electrode (6), organic matters in the wastewater undergo oxidation reaction on the surface of the anode, or strong oxidizing substances are generated on the surface of the particle electrode (6), and the strong oxidizing substances comprise Cl2、H2O2Containing O2 -One or more than two compounds degrade organic matters through the strong oxidizing substances, and simultaneously, a plurality of micro-electrolysis reactions exist in the activated carbon.
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