CN114751556A - Method and device for treating oily wastewater - Google Patents
Method and device for treating oily wastewater Download PDFInfo
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- CN114751556A CN114751556A CN202210445448.9A CN202210445448A CN114751556A CN 114751556 A CN114751556 A CN 114751556A CN 202210445448 A CN202210445448 A CN 202210445448A CN 114751556 A CN114751556 A CN 114751556A
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
- C02F2201/78—Details relating to ozone treatment devices
- C02F2201/782—Ozone generators
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention discloses a method and a device for treating oily wastewater, which relate to the technical field of industrial wastewater treatment, and the method comprises the following steps: standing the oily wastewater to naturally separate oil from water, floating the oil on the surface of the water, and collecting the upper-layer floating oil; lower floor's water carries out twice pressure filtration processing, pressure filtration processing goes on in the bentonite filter, collect filtrating, dilute, carry out ozone catalytic oxidation with the filtrating after diluting, can realize the separation of oil slick in step in same device, the bentonite filters and gets rid of, ozone catalytic oxidation degradation, make the complementary process of advantage that high concentration oily waste water realized discharge to reach standard, show improvement treatment effect and reduce the energy consumption, and the filter medium filter material in the bentonite filter adopts loose porous, the reserve volume is abundant and cheap bentonite, compare in active carbon, material such as high polymer environmental protection more and saving cost.
Description
Technical Field
The invention relates to the technical field of industrial wastewater treatment, in particular to a method and a device for treating oily wastewater.
Background
Metal cutting is widely used in manufacturing processes of machining, cutting, grinding, drilling, forging, and the like of metal materials. Cutting fluid with good cooling, lubricating, rust-proof, oil-removing and corrosion-proof properties is needed to be adopted to cool and lubricate the cutter and the machined part in the production process of metal materials, so that the aims of prolonging the service life of the cutter and improving the machining quality are fulfilled. Therefore, a large amount of waste cutting fluid is generated, which contains emulsified oil as a main component and also contains a small amount of high-molecular degradation-resistant organic substances such as surfactants, rust inhibitors, synthetic lubricants, antioxidants and antifoaming agents, and impurities such as dust and metal chips, and has a high concentration of pollutants and a high treatment difficulty.
The treatment of oily wastewater from cutting fluids is roughly classified into chemical, physical and biological methods 3. Physical methods include air flotation oil removal and membrane separation oil removal technologies, and often the air flotation method alone cannot completely remove pollutants, but the membrane separation cost is high, and the risk of oil drop penetration exists. Chemical methods include acid-out demulsification and coagulation. The effluent of the acid precipitation demulsification method is acidic, so that equipment is easily corroded, alkali is often added for neutralization, the cost is increased, and the effluent has more suspended matters, so that the wastewater can hardly reach the discharge standard by the single acid precipitation treatment. The coagulant alone can remove most of COD, but can not make the waste water reach the discharge standard. Biological treatment refers to a process in which microorganisms use pollutants in wastewater as nutrients, maintain life activities, and degrade the pollutants into harmless substances. Compared with a physical and chemical method, the biological treatment method of the wastewater has the advantages of low cost, environmental protection, high efficiency and the like. However, since microorganisms have severe environmental requirements and require a suitable living environment, it is difficult to directly treat special organic wastewater with low biodegradability by a biological method. Therefore, the development of a method suitable for treating oil-containing wastewater of cutting fluid has become an urgent problem to be solved.
The filtration method is to remove oil drops and impurity substances in the wastewater by utilizing the mechanisms of interception, inertial collision, screening, surface adhesion coalescence and the like of a granular medium filter bed, and is generally used for secondary treatment or advanced treatment. The filtering medium material commonly used for treating oily wastewater comprises quartz sand, anthracite, glass fiber, high molecular polymer, active carbon and the like. After the filtration treatment, the oil removal rate of the high-concentration oily wastewater can reach a higher level. But even a high removal rate makes it difficult to make the wastewater meet the discharge standard due to the high concentration of the stock solution of the oily wastewater. Although the filtration method has the advantages of simple equipment, convenient operation and the like, along with the increase of the operation time, the filtration capacity of the filter medium is limited, so a large amount of filter media are often required to be replaced, and the cost required by the filter material is very high, so that the search for a filter material with low cost and good oil removal effect becomes a problem which needs to be solved urgently.
The catalytic ozonation technology is an advanced oxidation technology and has the characteristics of high oxidation efficiency, good treatment effect on organic matters and the like. There are three main mechanisms for catalytic oxidation of pollutants by ozone: firstly, ozone forms high-activity species OH on the surface of a catalyst through chemical adsorption, and then reacts with pollutants in water; secondly, the pollutants are chemically adsorbed on the surface of the catalyst and then react with ozone; thirdly, ozone and pollutants are chemically adsorbed on the surface of the catalyst, and then the adsorbed species react with each other. Although the catalytic ozonation technology has many advantages in the aspect of wastewater treatment, when high-concentration oily wastewater is treated, a large amount of catalyst is needed, and the ozone addition amount also needs to be increased, so that the treatment cost is high, the operation cost needs to be further reduced, and when the catalytic ozonation device is used alone to treat high-concentration oily wastewater, impurities such as dust and metal chips in the wastewater are easily intercepted by catalyst fillers in a unit, the surface of the catalyst is covered, so that the catalytic efficiency is reduced, and the removal effect is reduced. Therefore, the oily wastewater is pretreated before entering the ozone catalytic oxidation unit.
Disclosure of Invention
In view of the above, the present invention aims to provide a method and an apparatus for treating oily wastewater, which can reduce the cost of treating oily wastewater, efficiently and simply treat high-concentration oily wastewater with COD of 128000mg/L, and solve the problem of treating high-concentration oily wastewater.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a method for treating oily wastewater, which comprises the following steps: standing the oily wastewater to naturally separate oil from water, wherein the natural separation of the oil from the water is based on the principles of incompatibility of the oil and the water and different densities, floating oil floats on the surface of the water body, and upper-layer floating oil is collected; and (3) carrying out twice pressure filtration treatment on the lower water body, wherein the pressure filtration treatment is carried out in a bentonite filter, collecting filtrate, diluting, and carrying out ozone catalytic oxidation on the diluted filtrate.
The main components of the oily wastewater comprise emulsified oil, a surfactant, an antirust agent, a synthetic emulsifier, an antifoaming agent, an antioxidant, dust, metal chips and the like.
Further, the standing time is 30-60 min.
Furthermore, the bentonite particles in the bentonite filter are 60 meshes, and the volume of the lower-layer water body is the same as that of the bentonite in the two times of pressure filtration treatment. When the particle size of the bentonite is larger than 60 mesh, the filtration resistance is further increased to cause a decrease in filtration efficiency. When the particle size of the bentonite is smaller than 60 meshes, the capability of the filter material for intercepting pollutants is reduced, the subsequent treatment difficulty of the pollutants is increased, and the cost is increased.
Further, the dilution factor was 10-fold. Although the pollutant concentration is greatly reduced after the two-stage filter filtration, the pollutant concentration is still at a higher level, and if the excessive pollutants are directly treated by ozone without dilution, the active sites of the catalyst are excessively covered, so that the efficiency is reduced, and the wastewater discharge standard cannot be met.
The invention also provides a device for treating the oily wastewater, which comprises an oil tank, a water delivery pipe, a wastewater pool, a floating oil collector, a centrifugal pump, a bentonite filter, a gas delivery pipe, a gas pump, an ozone catalytic oxidation tower and an ozone generator;
the oil tank, the floating oil collector, the centrifugal pump, the bentonite filter and the ozone catalytic oxidation tower are respectively communicated in sequence through water pipes;
the bentonite filter, the ozone catalytic oxidation tower and the ozone generator are communicated in sequence through gas pipes respectively.
The device comprises at least two bentonite filters, and the bentonite filters are communicated by a water conveying pipe.
Furthermore, the upper part of the wastewater pool is provided with a cover plate, the cover plate is provided with a small hole for the water delivery pipe to pass through, and the air pump can provide pressure of 0-1 Mpa.
Furthermore, the water inlet of the water pipe is always positioned below the floating oil in the wastewater pool.
Further, the catalyst in the ozone generator is an iron-based catalyst taking active carbon as a carrier, and the dosage of the catalyst is 50g/L (based on the volume of the treated wastewater).
Further, the preparation method of the catalyst comprises the following steps:
drying activated carbon, soaking the activated carbon in a ferrous sulfate heptahydrate solution with the concentration of 0.6398g/mL by an isometric method, standing overnight, drying at 110 ℃, and roasting at 750 ℃ for 3h to obtain the activated carbon.
Further, the impregnation amount in the preparation method of the catalyst was 10 wt%.
The bentonite is clay mineral with montmorillonite as main component, and can be used as a good oily wastewater purifying agent due to good adsorbability and cohesiveness, large specific surface area and ion exchange capacity, abundant reserves, and low price, and can adsorb oils from water.
The invention discloses the following technical effects:
the invention provides a method for treating oily wastewater, which separates floating oil by utilizing the principles of incompatible oil and water and different densities to reduce the difficulty of treating the oily wastewater. When the ozone catalytic oxidation technology is used alone to treat high-concentration oily wastewater, the catalyst consumption is large, the treatment cost is high, and the removal effect is relatively common due to the influence of dust and metal chips. Therefore, the filtration and the ozone catalytic oxidation technology are coupled, the concentration of the high-concentration oily wastewater is reduced by the filtration, and simultaneously, impurities such as dust, metal chips and the like are intercepted, and then the oily wastewater reaches the emission standard by the ozone catalytic oxidation, so that the operation cost is reduced. The invention also provides an oily wastewater treatment device, which can synchronously realize separation of floating oil, filtration and removal of bentonite and catalytic oxidation and degradation of ozone in the same device by utilizing a special structural design, so that the advantage complementation process of standard discharge of high-concentration oily wastewater is realized. The integration is that the effect of each process is synchronously realized in the same device, the treatment effect is obviously improved, the energy consumption is reduced, and the filter medium filter material in the bentonite filter adopts the bentonite which is loose and porous, has rich reserves and low price, and is more environment-friendly and saves the cost compared with materials such as active carbon, high molecular polymer and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of the structure of an oily wastewater treatment apparatus of the present invention, wherein: 1 oil tank, 2 water pipes, 3 wastewater ponds, 4 floating oil collectors, 5 cover plates, 6 centrifugal pumps, 7 bentonite filters, 8 gas pipes, 9 air pumps, 10 ozone catalytic oxidation towers and 11 ozone generators.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, for numerical ranges in the present disclosure, it is understood that each intervening value, to the upper and lower limit of that range, is also specifically disclosed. Every intervening value, to the extent any stated value or intervening value in a stated range, and any other stated or intervening value in a stated range, is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
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 invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The description and examples are intended to be illustrative only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
The embodiment of the invention provides an oily wastewater treatment device, which comprises an oil tank 1, a water delivery pipe 2, a wastewater pool 3, a floating oil collector 4, a centrifugal pump 6, a bentonite filter 7, a gas delivery pipe 8, an air pump 9, an ozone catalytic oxidation tower 10 and an ozone generator 11; the oil tank 1, the floating oil collector 4, the centrifugal pump 6, the bentonite filter 7 and the ozone catalytic oxidation tower 10 are respectively communicated in sequence through the water conveying pipe 2; the bentonite filter 7, the ozone catalytic oxidation tower 10 and the ozone generator 11 are communicated in sequence through a gas pipe 8 respectively, and the bentonite filter 7 is connected with a gas pump 9; a cover plate 5 is arranged at the upper part of the wastewater pool 3; the bentonite filters 7 are communicated by a water delivery pipe 2, and the water delivery pipe 2 is connected with a centrifugal pump 6.
The water inlet of the water pipe 2 is always positioned below the floating oil in the wastewater pool 3.
The cover plate 5 is provided with a small hole for the water delivery pipe 2 to pass through.
The bentonite filter is used for filtering by taking pressure as a driving force.
The oily wastewater treatment method provided by the embodiment of the invention comprises the following steps:
s1, storing the oily wastewater in an oily wastewater pool 3;
s2, standing the oily wastewater in the wastewater pool 3 for 30-60min to naturally separate oil and water, and floating oil on the surface;
s3, collecting and storing the floating oil floating on the surface of the water body in the step S2 in the oil tank 1;
s4, pumping water in the wastewater tank 3 to a bentonite filter 7 for primary pressure filtration treatment, wherein the bentonite particles in the bentonite filter 7 are 60 meshes;
s5, pumping the filtered filtrate to a second bentonite filter 7 for secondary pressure filtration treatment;
s6, adding water into the obtained filtrate to dilute by 10 times;
s7, pumping the filtrate diluted in the step S6 into an ozone catalytic oxidation tower 10;
s8 ozone generator 11 generates ozone, and the ozone is introduced into ozone catalytic oxidation tower 10;
the filtrate diluted by S9 enters an ozone catalytic oxidation tower 10 and then contacts with a catalyst;
and after the catalytic oxidation of the S10 ozone is finished, discharging the water body reaching the standard, wherein the COD of the water body reaching the standard is less than 100 mg/L.
The catalyst in the embodiment of the invention is an iron-based catalyst taking active carbon as a carrier; the iron-based catalyst is prepared by the following specific steps: screening 60-mesh active carbon, drying at 110 ℃, soaking the carrier in 0.6398g/mL heptahydrate ferrous sulfate solution (the active component soaking amount of Fe is 10%) by adopting an isometric method, standing overnight, then drying at 110 ℃, and roasting at 750 ℃ for 3 hours to obtain the catalyst.
The impregnation amount is (Fe active component mass + active carbon mass)/active carbon mass
Example 1
Storing the oily wastewater in a wastewater pool 3, standing for 30min to naturally separate oil and water, floating oil on the surface, and collecting and storing the floating oil floating on the surface of the water body in an oil tank 1. Pumping the lower water in the wastewater pool 3 to a bentonite filter 7 containing bentonite with the grain size of 60 meshes for first pressure filtration treatment. The filtered filtrate is pumped into a second bentonite filter 7 again for a second pressure filtration treatment. The obtained filtrate was diluted 10 times with water. Adjusting the pH value of the diluted mixed water to 11, pumping the mixed water into an ozone catalytic oxidation tower 10, turning on an ozone generator 11 to generate ozone, wherein the adding amount of the ozone is 0.25L/min, and introducing the ozone into the ozone catalytic oxidation tower 10. Adding 50g/L iron-based catalyst to perform ozone catalytic oxidation reaction for 100min, and taking the treated liquid to measure the COD concentration by a potassium dichromate method after the ozone catalytic oxidation is finished.
Example 2
Storing the oily wastewater in a wastewater pool 3, standing for 60min to naturally separate oil and water, floating the floating oil on the surface, and collecting and storing the floating oil floating on the surface of the water body in an oil tank 1. Pumping the lower water in the wastewater pool 3 to a bentonite filter 7 containing bentonite with the grain size of 60 meshes for first pressure filtration treatment. The filtered filtrate is pumped into a new bentonite filter 7 again for a second pressure filtration treatment. The obtained filtrate was diluted 10 times with water. Adjusting the pH value of the diluted mixed water to 11, pumping the mixed water into an ozone catalytic oxidation tower 10, turning on an ozone generator 11 to generate ozone, wherein the adding amount of the ozone is 0.25L/min, and introducing the ozone into the ozone catalytic oxidation tower 10. Adding 50g/L iron-based catalyst to perform ozone catalytic oxidation reaction for 100min, and taking the treated liquid to measure the COD concentration by a potassium dichromate method after the ozone catalytic oxidation is finished.
Comparative example 1
Storing the oily wastewater in an oily wastewater pool, standing for 30min to naturally separate oil and water, floating oil on the surface, and collecting and storing the floating oil floating on the surface of the water body in an oil tank. Pumping the lower water body in the wastewater pool to a bentonite filter containing bentonite with the particle size of 60 meshes for carrying out primary pressure filtration treatment. The COD concentration of the obtained filtrate was measured by a potassium dichromate method.
Comparative example 2
Storing the oily wastewater in an oily wastewater pool, standing for 30min to naturally separate oil and water, floating the floating oil on the surface, and collecting and storing the floating oil floating on the surface of the water body in an oil tank. Pumping the lower water body in the wastewater pool to a bentonite filter containing bentonite with the grain size of 60 meshes for carrying out primary pressure filtration treatment. And pumping the filtered filtrate into a new bentonite filter again for secondary pressure filtration treatment. The COD concentration of the obtained filtrate was measured by a potassium dichromate method.
Comparative example 3
Storing the oily wastewater in an oily wastewater pool, standing for 30min to naturally separate oil and water, floating oil on the surface, and collecting and storing the floating oil floating on the surface of the water body in an oil tank. Adjusting the pH value of the oily wastewater in the wastewater pool to 11, pumping the oily wastewater into an ozone catalytic oxidation tower, turning on an ozone generator to generate ozone, wherein the adding amount of the ozone is 0.25L/min, and introducing the ozone into the catalytic oxidation tower. 50g/L iron-based catalyst (same as that in example 1) was added to conduct ozone catalytic oxidation for 100min, and after completion of the ozone catalytic oxidation, the treated liquid was taken out and the COD concentration was measured by the potassium dichromate method.
Comparative example 4
Storing the oily wastewater in an oily wastewater pool, standing for 30min to naturally separate oil and water, floating oil on the surface, and collecting and storing the floating oil floating on the surface of the water body in an oil tank. Pumping the lower water body in the wastewater pool to a bentonite filter containing bentonite with the particle size of 30 meshes for carrying out primary pressure filtration treatment. The COD concentration of the obtained filtrate was measured by a potassium dichromate method.
Comparative example 5
Storing the oily wastewater in an oily wastewater pool, standing for 30min to naturally separate oil and water, floating oil on the surface, and collecting and storing the floating oil floating on the surface of the water body in an oil tank. Pumping the lower water body in the wastewater pool to a bentonite filter containing bentonite with the particle size of 100 meshes for carrying out primary pressure filtration treatment. According to the Hagen-Poe rise leaf equation
It is known that 100 mesh bentoniteThe particle size d of (2) becomes smaller, the pressure difference of the liquid passing through the filter material to overcome the flow resistance is increased, so that the liquid passing through the filter material becomes very difficult, thereby causing the reduction of the filtering efficiency.
Comparative example 6
Storing the oily wastewater in a wastewater pool, standing for 60min to naturally separate oil and water, floating the floating oil on the surface, and collecting and storing the floating oil floating on the surface of the water body in an oil tank. Pumping the lower water body in the wastewater pool to a bentonite filter containing bentonite with the particle size of 60 meshes for carrying out primary pressure filtration treatment. Pumping the filtered filtrate into a new bentonite filter again for secondary pressure filtration treatment. Directly adjusting the pH value of the obtained filtrate to 11 without dilution, pumping the filtrate into an ozone catalytic oxidation tower, turning on an ozone generator to generate ozone, wherein the adding amount of the ozone is 0.25L/min, and introducing the ozone into the ozone catalytic oxidation tower. Adding 50g/L iron-based catalyst to perform ozone catalytic oxidation reaction for 100min, and taking the treated liquid to measure the COD concentration by a potassium dichromate method after the ozone catalytic oxidation is finished.
Test example 1
The removal effect of the process under the experimental conditions of example 1, example 2, comparative example 1, comparative example 2, comparative example 3, comparative example 4, and comparative example 6 on oily wastewater was measured, and the measurement results are shown in table 1.
Taking 20.00mL of a treated wastewater sample (the water sample can be diluted to 20.00mL when the COD concentration in the treated wastewater is too high), placing the treated wastewater sample in a 250mL backflow conical flask with a ground opening, accurately adding 10mL of potassium dichromate standard solution and a plurality of small glass beads or zeolites, connecting a ground opening backflow condensing tube, slowly adding 30mL of sulfuric acid-silver sulfate solution from the upper opening of the condensing tube, slightly shaking the conical flask to uniformly mix the solution, and heating and refluxing for 2h (from the beginning of boiling timing).
After cooling, the walls of the condenser tube were rinsed with 90.00mL of water and the flask removed. The total volume of the solution must not be less than 140mL, otherwise the titration endpoint is not obvious because the acidity is too great.
And cooling the solution again, adding 3 drops of ferron indicator solution, titrating with a ferrous ammonium sulfate standard solution, changing the color of the solution from yellow to blue-green, and recording the use amount of the ferrous ammonium sulfate standard solution until the solution is reddish brown. While measuring the water sample, 20.00mL of redistilled water was used to make a blank experiment according to the same procedure. The amount of the standard solution of ferrous ammonium sulfate used for titration of the blank is recorded.
In the formulas (1) and (2), C is the concentration (mol/L) of the ammonium ferrous sulfate standard solution; v0The dosage (mL) of the ammonium ferrous sulfate standard solution when blank titration is carried out; v1The dosage (mL) of the standard solution of ferrous ammonium sulfate is used when a water sample is titrated; v is the volume (mL) of the water sample; 8 is the (1/20) molar mass (g/mol) of oxygen; r is the removal rate of COD.
TABLE 1
| Initial CODCr(mg/L) | COD after treatmentCr(mg/L) | CODCrRemoval rate R (%) | |
| Example 1 | 128000 | 92 | 99.93 |
| Example 2 | 128000 | 16 | 99.99 |
| Comparative example 1 | 128000 | 18400 | 85.63 |
| Comparative example 2 | 128000 | 8880 | 93.06 |
| Comparative example 3 | 128000 | 124000 | 3.13 |
| Comparative example 4 | 128000 | 100000 | 21.88 |
| Comparative example 6 | 128000 | 6840 | 94.66 |
As can be seen from Table 1, when the mixed water was filtered using the bentonite filter alone, the residual COD in the water was 18400 mg/L. The residual COD in the water after the filtrate passes through the bentonite filter again is 8880mg/L, which far reaches the discharge standard. Therefore, most of COD can be removed by filtering the mixed water by bentonite, but the original liquid concentration of the mixed water is too high, so that the removal capacity is limited, and further advanced treatment is required. When the ozone catalytic oxidation is used alone to treat the high-concentration oily wastewater, the removal rate of COD is only 3.13%, which indicates that the ozone catalytic oxidation is not suitable for removing the COD of the high-concentration oily wastewater and is suitable for the advanced treatment after the pretreatment of the high-concentration oily wastewater. The invention combines the advantages of the two methods, adopts the process of multiple filtration of the bentonite filter and the coupling of the catalytic oxidation of the ozone to successfully treat the oily wastewater with the COD concentration of 128000mg/L to be below 100mg/L, and meets the first-level standard in GB 128000-1996 Integrated wastewater discharge Standard, so that the water body reaches the discharge requirement.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. A method for treating oily wastewater is characterized by comprising the following steps: standing the oily wastewater to naturally separate oil from water, floating the oil on the surface of the water body, and collecting the upper-layer floating oil; and (3) carrying out twice pressure filtration treatment on the lower water body, wherein the pressure filtration treatment is carried out in a bentonite filter, collecting filtrate, diluting, and carrying out ozone catalytic oxidation on the diluted filtrate.
2. The treatment method according to claim 1, wherein the standing time is 30 to 60 min.
3. The method as set forth in claim 1, wherein the bentonite filter has 60 mesh particles of bentonite, and the volume of the lower layer of water is the same as that of the bentonite in both of the pressure filtration treatments.
4. The treatment process of claim 1, wherein the dilution factor is 10.
5. An oil-containing wastewater treatment device, which is used for implementing the treatment method according to any one of claims 1 to 4, and comprises an oil tank, a water delivery pipe, a wastewater pond, a floating oil collector, a centrifugal pump, a bentonite filter, a gas delivery pipe, a gas pump, an ozone catalytic oxidation tower and an ozone generator;
the oil tank, the floating oil collector, the centrifugal pump, the bentonite filter and the ozone catalytic oxidation tower are respectively communicated in sequence through water pipes;
the bentonite filter, the ozone catalytic oxidation tower and the ozone generator are communicated in sequence through gas pipes respectively.
6. The apparatus of claim 5, wherein a cover plate is provided on an upper portion of the wastewater tank.
7. The device as claimed in claim 5, wherein the water inlet of the water pipe is always under the floating oil in the wastewater pool.
8. The apparatus of claim 5, wherein the catalyst in the ozone generator is an iron-based catalyst supported on activated carbon.
9. The apparatus of claim 8, wherein the method for preparing the catalyst comprises the following steps:
drying activated carbon, soaking the activated carbon in a heptahydrate ferrous sulfate solution with the concentration of 0.6398g/mL by adopting an isometric method, standing overnight, then drying at 110 ℃, and roasting at 750 ℃ for 3 hours to obtain the activated carbon.
10. The apparatus of claim 9, wherein the impregnation amount is 10 wt%.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101437816B1 (en) * | 2014-05-14 | 2014-09-12 | 에이치플러스에코 주식회사 | Method for Treating Wastewater, System for Treating Wastewater and BENZENE's Separating and Eliminating Apparatus used for the same |
| CN106315908A (en) * | 2015-06-29 | 2017-01-11 | 宝山钢铁股份有限公司 | Deep processing method and device of cold rolling oil-containing wastewater |
| CN206127063U (en) * | 2016-08-31 | 2017-04-26 | 北京华福环境工程科技有限公司 | Petrochemical sewage degree of depth processing system |
| CN109607963A (en) * | 2019-01-07 | 2019-04-12 | 江苏森茂能源发展有限公司 | A kind of processing method and processing system of high cod oily waste water |
| CN112777779A (en) * | 2019-11-11 | 2021-05-11 | 广东红海湾发电有限公司 | Oily wastewater treatment method |
-
2022
- 2022-04-26 CN CN202210445448.9A patent/CN114751556A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101437816B1 (en) * | 2014-05-14 | 2014-09-12 | 에이치플러스에코 주식회사 | Method for Treating Wastewater, System for Treating Wastewater and BENZENE's Separating and Eliminating Apparatus used for the same |
| CN106315908A (en) * | 2015-06-29 | 2017-01-11 | 宝山钢铁股份有限公司 | Deep processing method and device of cold rolling oil-containing wastewater |
| CN206127063U (en) * | 2016-08-31 | 2017-04-26 | 北京华福环境工程科技有限公司 | Petrochemical sewage degree of depth processing system |
| CN109607963A (en) * | 2019-01-07 | 2019-04-12 | 江苏森茂能源发展有限公司 | A kind of processing method and processing system of high cod oily waste water |
| CN112777779A (en) * | 2019-11-11 | 2021-05-11 | 广东红海湾发电有限公司 | Oily wastewater treatment method |
Non-Patent Citations (3)
| Title |
|---|
| 宋辛: "《改性纳米碳纤维材料制备及在环境污染治理中的应用》", 30 November 2020, 冶金工业出版社 * |
| 李凯等: "《低温等离子体表面修饰技术在催化剂材料制备中的应用》", 31 July 2017, 冶金工业出版社 * |
| 郝友明等: "《电力用油（气）实用技术问答》", 31 March 2000, 中国水利水电出版社 * |
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