CN108408999B - Pretreatment method and device for cutting waste liquid - Google Patents
Pretreatment method and device for cutting waste liquid Download PDFInfo
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- CN108408999B CN108408999B CN201810495353.1A CN201810495353A CN108408999B CN 108408999 B CN108408999 B CN 108408999B CN 201810495353 A CN201810495353 A CN 201810495353A CN 108408999 B CN108408999 B CN 108408999B
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
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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
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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Abstract
The invention relates to the field of wastewater treatment, in particular to a pretreatment method and device for cutting waste liquid. The method comprises the following steps: pumping the cutting waste liquid in the collecting tank into an adjusting tank, and adjusting the pH value of the waste liquid to 3.0-5.0; step two: pumping the cutting waste liquid of the regulating tank into a three-in-one reactor containing an electric flocculation-electric Fenton-three-dimensional electrolytic treatment technology, and demulsifying the cutting waste liquid to remove most of organic matters; step three: pumping the effluent of the three-in-one reactor into a coagulating sedimentation tank, regulating the pH value of waste liquid in the coagulating sedimentation tank to 7.0-10.0, adding a flocculating agent for coagulating sedimentation treatment, and directly connecting the effluent of the coagulating sedimentation tank into a comprehensive wastewater treatment system. The pretreatment method and the device suitable for the method can thoroughly demulsify the cutting waste liquid and have good biodegradability of the discharged water.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a pretreatment method and device for cutting waste liquid.
Background
The cutting fluid is a common coolant and lubricant used in the metal processing and machining processes, and the components of the cutting fluid comprise oil, oil-water emulsion, paste, gel, water and the like according to different application occasions, and the cutting fluid has the functions of lubricating, cooling, cleaning, rust prevention and the like in the metal processing or machining processes.
The cutting fluid generates a large amount of cutting waste liquid due to impurity mixing failure in the using process, and the main chemical components of the cutting fluid comprise water, base oil (mineral oil, vegetable oil, synthetic ester or a mixture thereof), surfactant, antirust additive (zinc naphthenate, sodium petroleum sulfonate (also an emulsifier), barium petroleum sulfonate, benzotriazole, sorbitol monooleate, aluminum stearate), extreme pressure additive (polar compounds containing sulfur, phosphorus, chlorine and other elements), friction improver (antifriction agent or oily additive), antioxidant and the like, and the organic pollutant and ammonia nitrogen have high concentration and certain toxicity, and if the cutting fluid is directly discharged untreated, the environment is seriously polluted and the human health is endangered. Therefore, it is important to properly treat the cutting waste liquid.
At present, most of the treatment methods of cutting waste liquid are carried out solid-liquid separation after demulsifier is added, and then the cutting waste liquid is incorporated into a comprehensive waste water treatment system, so that the defects of incomplete demulsification, poor biodegradability, large additive amount of the demulsifier, excessive medicament cost, large sludge amount, high disposal cost outside the commission and the like exist.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a pretreatment method of cutting waste liquid which is thoroughly demulsified and good in water-out biodegradability after being treated by an electric flocculation-electro-Fenton-three-dimensional electrolysis composite technology and a pretreatment device of the cutting waste liquid which is suitable for the method.
The technical scheme of the invention is as follows: the pretreatment method of the cutting waste liquid comprises the following steps:
step one: pumping the cutting waste liquid in the collecting tank into an adjusting tank, and adjusting the pH value of the waste liquid to 3.0-5.0;
step two: pumping the cutting waste liquid of the regulating tank into a three-in-one reactor containing an electric flocculation-electric Fenton-three-dimensional electrolytic treatment technology, and demulsifying the cutting waste liquid to remove most of organic matters;
step three: pumping the effluent of the three-in-one reactor into a coagulating sedimentation tank, regulating the pH value of waste liquid in the coagulating sedimentation tank to 7.0-10.0, adding a flocculating agent for coagulating sedimentation treatment, and directly connecting the effluent of the coagulating sedimentation tank into a comprehensive wastewater treatment system.
Preferably, the flocculant in the third step is polyacrylamide, and the addition amount of the flocculant is 2-5mg/L; and the coagulating sedimentation time of the waste liquid in the coagulating sedimentation tank is 30-50min.
Preferably, the waste water in the second step is subjected to air floatation slag scraping treatment through a slag scraping device before entering the three-in-one reactor.
Preferably, the three-in-one reactor of the electric flocculation-electro-Fenton-three-dimensional electrolytic treatment technology in the second step comprises an electric flocculation reaction zone, an electric Fenton reaction zone and a three-dimensional electrolytic reaction zone, wherein an anode polar plate and two cathode polar plates are arranged in the three-in-one reactor, a first compressed air inlet is arranged at the bottom of the electric flocculation reaction zone, and a waste liquid pump inlet, a flocculating agent injection port and a slag scraping device are arranged at the upper part of the electric flocculation reaction zone; the middle part of the electro-Fenton reaction zone is provided with an oxidant injection port, and the bottom of the electro-Fenton reaction zone is provided with a second compressed air inlet; the three-dimensional electrolytic reaction zone is internally filled with a third electrode sintered by an iron-carbon-based catalyst, a third compressed air inlet is arranged at the bottom of the third electrode, and a water outlet is arranged at the upper part of the three-dimensional electrolytic reaction zone.
Preferably, the aeration speed of the first, second and third compressed air inlets is 2.5-5L/min.
Preferably, the oxidant injected into the electro-Fenton reaction zone is H 2 O 2 The addition amount is 2ml/L to 6m1/L.
Preferably, the current density of the electrode in the three-dimensional electrolytic reaction zone is 25mA/cm 2 -200mA/cm 2 The reaction time is 30-80min.
The other technical scheme of the invention is as follows: the pretreatment device for the cutting waste liquid comprises a collecting tank for collecting the cutting waste liquid, an adjusting tank for adjusting the pH value of the cutting waste liquid, a three-in-one reactor for carrying out electrolytic oxidation treatment on the cutting waste liquid and a coagulating sedimentation tank, wherein the three-in-one reactor is a three-in-one electrolytic tank comprising an electric flocculation-electro-Fenton-three-dimensional electrolytic treatment technology; the device comprises a collecting tank, a regulating tank, a three-in-one electrolytic tank and a coagulating sedimentation tank, wherein the collecting tank, the regulating tank, the three-in-one electrolytic tank and the coagulating sedimentation tank are sequentially connected through pipelines from left to right according to the wastewater treatment sequence, a first lifting pump is arranged on a pipeline connecting the collecting tank and the regulating tank, and a second lifting pump is arranged on a pipeline connecting the regulating tank and the three-in-one reactor.
Preferably, the three-in-one electrolytic tank comprises a rectangular tank body, an anode polar plate and two cathode polar plates which are arranged in the rectangular tank body, wherein the rectangular tank body is provided with a first partition plate and a second partition plate from left to right.
The first partition plate and the second partition plate divide the inner cavity of the rectangular groove body into an electric flocculation reaction area, an electric Fenton reaction area and a three-dimensional electrolysis reaction area, a plurality of round holes with diameters of 3-7mm are formed in the middle of the first partition plate, a plurality of round holes with diameters of 3-7mm are formed in the lower portion of the second partition plate, the anode plate is arranged in the middle of the rectangular groove body and perpendicular to the first partition plate and the second partition plate, two cathode plates are respectively arranged on the front side and the rear side of the anode plate and parallel to the anode plate, and the distance between each cathode plate and the anode plate is 250-500mm.
Preferably, the bottom of the electric flocculation reaction zone is provided with a first compressed air inlet, the upper part of the electric flocculation reaction zone is sequentially provided with a slag scraping device, a waste liquid pump inlet and a flocculating agent injection port from top to bottom, the middle part of the electric Fenton reaction zone is provided with an oxidant injection port, the bottom of the electric Fenton reaction zone is provided with a second compressed air inlet, the inside of the three-dimensional electrolytic reaction zone is filled with a third electrode formed by sintering an iron-carbon-based catalyst, the bottom of the three-dimensional electrolytic reaction zone is provided with a third compressed air inlet, and the upper part of the three-dimensional electrolytic reaction zone is provided with a water outlet.
Preferably, the anode plate is a composite plate, and the composite plate is any combination of an iron electrode, an aluminum electrode and a titanium electrode; the cathode plate material is one of graphite material, stainless steel material and titanium material.
The beneficial effects of the invention are as follows:
1. after being treated by the electric flocculation-electro Fenton-three-dimensional electrolysis composite technology, the original emulsified structure is broken, the effluent is clear, annular and chain organic matters in the cutting waste liquid are sequentially degraded, and most organic matters are removed.
2. After the treatment by the electric flocculation-electro-Fenton-three-dimensional electrolysis composite technology, the biodegradability of the cutting waste liquid is good, and the problem that the high-concentration cutting waste liquid cannot be stably connected with biochemical treatment is solved.
3. The method and the device adopt electric flocculation and air floatation slag scraping to realize basic demulsification of the cutting waste liquid, the waste liquid is clear after slag scraping, and then the electric Fenton is adopted to thoroughly demulsifie, so that the problem that the high-concentration cutting waste liquid cannot be continuously and thoroughly demulsified is solved.
4. Residual H is excited by three-dimensional electrolysis 2 O 2 More hydroxyl radicals are generated by complete reaction, organic matters are further degraded, toxicity of cutting waste liquid is reduced, and residual H is solved 2 O 2 The problem of affecting the microbial activity is solved simultaneously 2 O 2 Is fully utilized.
5. The device has the advantages of simple design, compact structure, small occupied area, small disposable investment, high automation operation degree and general applicability.
6. In the running process of the device, only a small amount of polyacrylamide and H are needed to be added 2 O 2 And acid, less extra sludge is added, the operation cost is low, the waste liquid treatment burden is small, and the method is suitable for popularization and use.
Drawings
FIG. 1 is a schematic flow chart of a pretreatment method of cutting waste liquid.
Fig. 2 is a schematic structural view of a pretreatment device for cutting waste liquid according to the present invention.
FIG. 3 is a top view of a three-in-one electrolytic cell of a pretreatment device for cutting waste liquid according to the present invention.
Detailed Description
The invention will be further described in detail below with reference to the accompanying drawings:
referring to fig. 1, the invention provides a pretreatment method of cutting waste liquid, comprising the following steps:
step one: pumping the cutting waste liquid in the collecting tank into an adjusting tank, and adjusting the pH value of the waste liquid to 3.0-5.0;
step two: pumping the cutting waste liquid of the regulating tank into a three-in-one reactor containing an electric flocculation-electric Fenton-three-dimensional electrolytic treatment technology, and demulsifying the cutting waste liquid to remove most of organic matters; the three-in-one reactor comprises an electric flocculation reaction zone, an electric Fenton reaction zone and a three-dimensional electrolysis reaction zone, wherein an anode plate and two cathode plates are arranged in the three-in-one reactor, a first compressed air inlet is arranged at the bottom of the electric flocculation reaction zone, and a waste liquid pump inlet, a flocculating agent injection port and a slag scraping device are arranged at the upper part of the electric flocculation reaction zone; the middle part of the electro-Fenton reaction zone is provided with an oxidant injection port, and the bottom of the electro-Fenton reaction zone is provided with a second compressed air inlet; the three-dimensional electrolytic reaction zone is internally filled with a third electrode sintered by an iron-carbon-based catalyst, a third compressed air inlet is arranged at the bottom of the third electrode, and a water outlet is arranged at the upper part of the three-dimensional electrolytic reaction zone.
Step three: pumping the effluent of the three-in-one reactor into a coagulating sedimentation tank, regulating the pH value of waste liquid in the coagulating sedimentation tank to 7.0-10.0, adding a flocculating agent for coagulating sedimentation treatment, and directly connecting the effluent of the coagulating sedimentation tank into a comprehensive wastewater treatment system.
The flocculant in the third step is polyacrylamide, and the addition amount of the flocculant is 2-5mg/L; and the coagulating sedimentation time of the waste liquid in the coagulating sedimentation tank is 30-50min.
And (3) before the wastewater in the step two enters the three-in-one reactor, performing air floatation slag scraping treatment through a slag scraping device.
The aeration speed of the first, second and third compressed air inlets is 2.5-5L/min.
The oxidant injected into the electro-Fenton reaction zone is H 2 O 2 The addition amount is 2ml/L to 6m1/L.
The current density of the electrode in the three-dimensional electrolytic reaction zone when the wastewater is electrolyzed is 25mA/cm 2 -200mA/cm 2 The reaction time is 30-80min.
Referring to fig. 2, the present invention provides a pretreatment device for cutting waste liquid, comprising a collecting tank 1 for collecting cutting waste liquid, an adjusting tank 3 for adjusting pH value of cutting waste liquid, a three-in-one reactor 12 for performing electrolytic oxidation treatment on the cutting waste liquid, and a coagulating sedimentation tank 19, wherein the three-in-one reactor 12 is a three-in-one electrolytic tank comprising an electroflocculation-electro-Fenton-three-dimensional electrolytic treatment technology; the collecting tank 1, the regulating tank 3, the three-in-one electrolytic tank and the coagulating sedimentation tank 19 are sequentially connected through pipelines from left to right according to the wastewater treatment sequence, a first lifting pump 2 is arranged on a pipeline connecting the collecting tank 1 and the regulating tank 3, and a second lifting pump 4 is arranged on a pipeline connecting the regulating tank 3 and the three-in-one reactor 12.
Referring to fig. 2 and 3, the three-in-one electrolytic cell comprises a rectangular cell body, an anode plate 21 and two cathode plates 20, wherein the anode plate 21 and the two cathode plates 20 are arranged in the rectangular cell body, the rectangular cell body is provided with a first partition plate 8 and a second partition plate 9 from left to right, the inner cavities of the rectangular cell body are divided into an electric flocculation reaction area, an electro Fenton reaction area and a three-dimensional electrolytic reaction area by the first partition plate 8 and the second partition plate 9, a plurality of round holes 10 with diameters of 3-7mm are formed in the middle of the first partition plate 8, a plurality of round holes 14 with diameters of 3-7mm are formed in the lower part of the second partition plate 9, the anode plate 21 is arranged in the middle of the rectangular cell body and is perpendicular to the first partition plate and the second partition plate, the two cathode plates 20 are respectively arranged on the front side and the rear side of the anode plate 21 and are parallel to the anode plate 21, and the distance between each cathode plate 20 and the anode plate 21 is 250-500mm.
The bottom of the electric flocculation reaction zone is provided with a first compressed air inlet 13, the upper part of the electric flocculation reaction zone is sequentially provided with a slag scraping device 7, a waste liquid pump inlet 5 and a flocculating agent injection opening 6 from top to bottom, the middle part of the electric Fenton reaction zone is provided with an oxidant injection opening 11, the bottom of the electric Fenton reaction zone is provided with a second compressed air inlet 15, the inside of the three-dimensional electrolytic reaction zone is filled with a third electrode 17 formed by sintering an iron-carbon-based catalyst, the bottom of the three-dimensional electrolytic reaction zone is provided with a third compressed air inlet 16, and the upper part of the three-dimensional electrolytic reaction zone is provided with a water outlet 18. The polyacrylamide required for flocculation is injected from the flocculant injection port 6 and the addition amount is 2-5mg/L.
The H required for the reaction is injected through the oxidant injection port 11 2 O 2 The addition amount is 2ml/L to 6m1/L.
The third electrode 17 is a granular iron-carbon electrode, the iron-carbon ratio is 1:l, and the filling quantity is 40% -50%.
The current density of the electrode during the electrolysis of the three-in-one electrolytic tank is 25mA/cm 2 -200mA/cm 2 The reaction time is 30-80min.
The anode plate 21 is a composite plate, and the composite plate is any combination of an iron electrode, an aluminum electrode and a titanium electrode; the cathode plate 20 is made of one of graphite material, stainless steel material and titanium material.
The working principle of the invention is as follows:
the cutting waste liquid is collected by the collecting tank 1. The cutting waste liquid in the collecting tank 1 is pumped into the regulating tank 3 through the first lifting pump 2, the pH value of the waste water is regulated to be 3.0-5.0, and the pH value can optimize the electric flocculation, electro-Fenton and three-dimensional electrolysis integrated treatment effect. When the pH value is lower than the lower limit of the range, the anode loss of the electroflocculation electrode is too fast, and H is generated by electro-Fenton 2 O 2 The efficiency is reduced, and the three-dimensional electrolysis is easier to generate dilute hydrogen reaction; when the pH value is higher than the upper limit of the range, the demulsification efficiency of the anode of the electroflocculation electrode is reduced, and Fe needed by electro-Fenton is reduced 2+ Precipitation is easy to generate, the electro-Fenton reaction causes efficiency reduction, and the surface of the three-dimensional electrolytic filler is passivated, so that the filler is deactivated.
Then, the cutting waste liquid in the regulating tank 3 is pumped into a three-in-one electrolytic tank which integrates the electric flocculation-electro-Fenton-three-dimensional electrolytic composite technology through a second lifting pump 4, so that the basic demulsification of the cutting waste liquid is realized in an electric flocculation reaction zone, and the problem that the continuous and thorough demulsification of the high-concentration cutting waste liquid can not be realized is solved by adopting the electro-Fenton; residual H is excited by three-dimensional electrolysis 2 O 2 More hydroxyl radicals are generated by complete reaction, organic matters are further degraded, the toxicity of the cutting waste liquid is reduced, and the residual H is solved 2 O 2 The problem of affecting subsequent biological treatments.
In the electric flocculation reaction system, oxygen in injected compressed air is reduced to generate hydrogen peroxide, a large amount of nascent ferric salt and aluminum salt are generated by composite anodic oxidation, annular and chain organic matters in the cutting waste liquid react with the nascent ferric salt and aluminum salt under the catalytic action of the hydrogen peroxide to generate floccules which can be scraped by air floatation, and most of the original emulsifying structures are demulsified.
And pumping the cutting waste liquid treated by the three-in-one electrolytic tank into a coagulating sedimentation tank, regulating the pH value of the waste liquid in the coagulating sedimentation tank to 7.0-10.0, adding a flocculating agent for coagulating sedimentation treatment, and directly bringing the coagulating sedimentation effluent into a comprehensive wastewater treatment system, wherein the biodegradability of the coagulating sedimentation effluent is good.
The flocculant is polyacrylamide, the addition amount of the flocculant is 2-5mg/L, and the coagulating sedimentation time is 30-50min. In the electro-Fenton reaction system, nascent state Fe 2+ Reacts with H2O2 to generate OH, and then oxidatively decomposes organic matters, wherein the formulas (1) and (2) are as follows:
Fe 2+ +H 2 O 2 →Fe 3+ +·OH+OH - (1)
·OH+RH→·R+H 2 O (2)
in the three-dimensional electrolytic reaction system, oxygen in the injected compressed air is reduced to generate hydrogen peroxide, and the generated hydrogen peroxide and the residual hydrogen peroxide in the electro-Fenton reaction zone are quickly matched with Fe in the solution 2+ Reaction to produce OH and Fe 3+ Due to Fe 3+ Is positive compared with the initial reduction potential of O2, thus Fe 3+ Can be reduced and regenerated into Fe in the reduction process of O2 on a cathode 2+ 。
OH has very strong oxidizing power (2.8V) and is inferior to the oxidizing power of fluorine (2.87V), and can generate oxidation-reduction effect with a plurality of components in the wastewater to destroy the structure of annular and chain organic matters, and the macromolecules are decomposed into small molecules, so that the purposes of demulsification and organic matter degradation are achieved.
The following table shows six experimental data obtained using the method of the present invention in the apparatus of the present invention.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (7)
1. The pretreatment device for the cutting waste liquid comprises a collecting tank for collecting the cutting waste liquid, an adjusting tank for adjusting the pH value of the cutting waste liquid, a three-in-one reactor for carrying out electrolytic oxidation treatment on the cutting waste liquid and a coagulating sedimentation tank, and is characterized in that the three-in-one reactor is a three-in-one electrolytic tank comprising an electric flocculation-electro-Fenton-three-dimensional electrolytic treatment technology; the collecting tank, the regulating tank, the three-in-one electrolytic tank and the coagulating sedimentation tank are sequentially connected through pipelines from left to right according to the wastewater treatment sequence, a first lifting pump is arranged on a pipeline connecting the collecting tank and the regulating tank, and a second lifting pump is arranged on a pipeline connecting the regulating tank and the three-in-one reactor;
the three-in-one electrolytic tank comprises a rectangular tank body, an anode plate and two cathode plates, wherein the anode plate and the two cathode plates are arranged in the rectangular tank body, a first partition plate and a second partition plate are arranged on the rectangular tank body from left to right, the first partition plate and the second partition plate divide the inner cavity of the rectangular tank body into an electric flocculation reaction area, an electric Fenton reaction area and a three-dimensional electrolytic reaction area, a plurality of round holes with diameters of 3-7mm are formed in the middle of the first partition plate, a plurality of round holes with diameters of 3-7mm are formed in the lower portion of the second partition plate, the anode plates are arranged in the middle of the rectangular tank body and are perpendicular to the first partition plate and the second partition plate, the two cathode plates are respectively arranged on the front side and the rear side of the anode plates and are parallel to the anode plates, and the distance between each cathode plate and the anode plates is 250-500 mm;
the electric flocculation reaction zone is characterized in that a first compressed air inlet is formed in the bottom of the electric flocculation reaction zone, a slag scraping device, a waste liquid pump inlet and a flocculating agent injection opening are sequentially formed in the upper portion of the electric flocculation reaction zone from top to bottom, an oxidant injection opening is formed in the middle of the electric Fenton reaction zone, a second compressed air inlet is formed in the bottom of the electric Fenton reaction zone, a third electrode formed by sintering an iron-carbon-based catalyst is filled in the three-dimensional electrolytic reaction zone, a third compressed air inlet is formed in the bottom of the three-dimensional electrolytic reaction zone, and a water outlet is formed in the upper portion of the three-dimensional electrolytic reaction zone.
2. The pretreatment device of cutting waste liquid according to claim 1, wherein the anode plate is a composite plate, and the composite plate is a combination of an iron electrode and an aluminum electrode; the cathode plate material is one of graphite material, stainless steel material and titanium material.
3. A pretreatment method of cutting waste liquid, employing the pretreatment device of cutting waste liquid according to any one of claims 1 to 2, characterized by comprising the steps of:
step one: pumping the cutting waste liquid in the collecting tank into an adjusting tank, and adjusting the pH value of the cutting waste liquid to 3.0-5.0;
step two: pumping the cutting waste liquid of the regulating tank into a three-in-one reactor containing an electric flocculation-electric Fenton-three-dimensional electrolytic treatment technology, and demulsifying the cutting waste liquid to remove most of organic matters;
step three: pumping the effluent of the three-in-one reactor into a coagulating sedimentation tank, adjusting the pH value of waste liquid in the coagulating sedimentation tank to 10.0, adding a flocculating agent for coagulating sedimentation treatment, and directly connecting the effluent of the coagulating sedimentation tank into a comprehensive wastewater treatment system.
4. The pretreatment method of cutting waste liquid as claimed in claim 3, wherein the flocculant in the third step is polyacrylamide, and the addition amount is 2-5mg/L; and the coagulating sedimentation time of the waste liquid in the coagulating sedimentation tank is 30-50min.
5. The pretreatment method of the cutting waste liquid according to claim 3, wherein the waste water in the second step is subjected to air floatation slag scraping treatment by a slag scraping device before entering the three-in-one reactor.
6. The pretreatment method of cutting waste liquid as claimed in claim 3, wherein the aeration speed of the first compressed air inlet, the second compressed air inlet and the third compressed air inlet is 2.5-5L/min; the oxidant injected into the electro-Fenton reaction zone is H 2 O 2 The addition amount is 2ml/L-6 ml/L.
7. The pretreatment method of cutting waste liquid according to claim 3, characterized in thatThe current density of the electrode during the electrolysis of the wastewater in the three-dimensional electrolytic reaction zone is 25mA/cm 2 -200 mA/cm 2 The reaction time is 30-80min.
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| CN105016537A (en) * | 2014-04-30 | 2015-11-04 | 荣诚环境工程集团有限公司 | Plug flow type dual-electrode electrolysis air floater |
| CN206142964U (en) * | 2016-09-18 | 2017-05-03 | 广东智环创新环境科技有限公司 | Integration high concentration sewage advanced oxidation treatment equipment |
| CN107117748A (en) * | 2017-06-21 | 2017-09-01 | 深圳市世清环保科技有限公司 | The processing method and processing unit of aluminium anodes padding waste water decoloring |
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