CN112811762A - Treatment method of oily sludge - Google Patents

Treatment method of oily sludge Download PDF

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CN112811762A
CN112811762A CN202011590210.2A CN202011590210A CN112811762A CN 112811762 A CN112811762 A CN 112811762A CN 202011590210 A CN202011590210 A CN 202011590210A CN 112811762 A CN112811762 A CN 112811762A
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oily sludge
treatment
titanium dioxide
oil
catalytic
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CN112811762B (en
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籍国东
党正柱
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Peking University
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Peking University
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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
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G47/00—Cracking of hydrocarbon oils, in the presence of hydrogen or hydrogen- generating compounds, to obtain lower boiling fractions
    • C10G47/02—Cracking of hydrocarbon oils, in the presence of hydrogen or hydrogen- generating compounds, to obtain lower boiling fractions characterised by the catalyst used
    • C10G47/04—Oxides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G47/00—Cracking of hydrocarbon oils, in the presence of hydrogen or hydrogen- generating compounds, to obtain lower boiling fractions
    • C10G47/32—Cracking of hydrocarbon oils, in the presence of hydrogen or hydrogen- generating compounds, to obtain lower boiling fractions in the presence of hydrogen-generating compounds
    • 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
    • C02F2209/02—Temperature
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/06—Sludge reduction, e.g. by lysis
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
    • C10G2300/10—Feedstock materials
    • C10G2300/1003—Waste materials

Abstract

The invention provides a method for treating oily sludge. The method comprises the following steps: titanium dioxide is used as a catalyst, and the oily sludge is subjected to catalytic treatment through catalytic hydrothermal reaction. In the treatment method provided by the invention, on one hand, the structure of the oily sludge aggregate can be destroyed based on the titanium dioxide catalytic hydrothermal reaction to promote the lightening of heavy petroleum hydrocarbon, so that the release of water and oil in the oily sludge is promoted, and the dehydration efficiency, the oil removal efficiency and the resource extraction utilization efficiency of the oily sludge are improved; on the other hand, the treatment method has the advantages of simplicity, practicability, low cost, no secondary environmental pollution, high resource degree and the like. Therefore, the treatment method provided by the invention is suitable for treating various oily sludge generated in petrochemical industry, can realize reduction, harmless and recycling treatment and utilization of the oily sludge, and has wide application prospect.

Description

Treatment method of oily sludge
Technical Field
The invention relates to the technical field of environmental protection, and mainly relates to a treatment method of oily sludge.
Background
The oily sludge waste generated in the petrochemical industry has complex components, contains a large amount of petroleum substances and a plurality of refractory organic matters with 'three-cause effect', and brings great harm to the health and the ecological environment of a human body. The oily sludge is high in recycling and reduction treatment cost and high in operation difficulty, and is an international problem in the field of harmless treatment of hazardous wastes. According to estimation, currently, the ground oil sludge and tank bottom oil sludge produced in China each year account for about 2 percent of the total crude oil yield, and are close to 430 ten thousand tons. The total amount of bottom mud of an oil separation tank, bottom mud of a flotation tank, floating slag of the flotation tank and residual activated sludge of an oil refinery in the petrochemical refining link is about 200 ten thousand tons. In view of the real problem of serious lagged treatment and disposal of the oily sludge hazardous waste left over historically, there is an urgent need for more than 1500 million tons of oily sludge to be harmlessly treated.
The sludge treatment and disposal process and the technical level in China can not meet the requirement of harmless recycling of oily sludge, and have defects in the aspects of investment, treatment effect, operation cost and the like. The solidification treatment method cannot effectively control the erosion and leaching of organic matters and harmful ions in the oily sludge to soil, and the capacity increase of a solidified substance is serious; the solvent extraction method has long treatment flow, complex process and high cost; the landfill method has low cost, but the landfill can occupy a large amount of land resources and is easy to cause secondary pollution; the incineration has the advantages that the efficiency is high, the incineration is more thorough, however, the oil sludge can not be directly incinerated due to the characteristic of high water content, a large amount of fuel oil needs to be added for auxiliary combustion, the energy consumption is high, and a large amount of waste gas and fly ash containing toxic and harmful organic matters can be generated; the biological method has low treatment cost, but the oily sludge has poor degradability, long treatment period, incomplete degradation and great influence by climatic conditions.
In summary, from the multidimensional perspective of reduction, harmlessness and recycling, the existing technical method for treating the oily sludge has high cost, great operation difficulty, serious secondary pollution or low recycling degree. Therefore, there is a need in the art to develop a new technology for the reduction, harmless and recycling treatment of oily sludge, which can replace the prior art method.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for treating oily sludge. In the method, the titanium dioxide catalytic hydrothermal reaction can destroy the structure of the oily sludge aggregate and promote the release of water and oil, so that the dehydration efficiency, the oil removal efficiency and the extraction efficiency of the oily sludge are improved, and the oily sludge is quickly and efficiently treated; meanwhile, the thermal catalysis of the titanium dioxide can promote the cracking conversion of petroleum hydrocarbon to form light hydrocarbon, and the reduction, harmless and resource treatment of the oily sludge is realized. The specific contents are as follows:
the invention provides a treatment method of oily sludge, which comprises the following steps: titanium dioxide is used as a catalyst, and the oily sludge is subjected to catalytic treatment through catalytic hydrothermal reaction.
Optionally, the processing method further includes:
carrying out high-temperature centrifugation on the mixed system after the catalytic treatment to obtain centrifugate and treated bottom mud;
and according to the principle that oil and water are immiscible, performing liquid-liquid separation on the centrifugate, and recovering the water and the oil.
Optionally, the processing method further includes: treating the treated bottom mud by a curing treatment method, a landfill method or a burning method;
or converting the treated bottom mud into recyclable low-quality soil.
Optionally, the oily sludge is raw oily sludge waste without any pretreatment.
Optionally, the catalytic treatment of the oily sludge by catalytic hydrothermal reaction with titanium dioxide as a catalyst comprises:
step 1, mixing titanium dioxide and oily sludge by taking titanium dioxide as a catalyst to obtain a reaction system;
and 2, placing the reaction system in a hydrothermal reaction kettle, and carrying out catalytic treatment according to preset reaction conditions.
Optionally, in the step 1, the mass ratio of the titanium dioxide to the oily sludge is 1-2: 100.
optionally, in the step 2, the preset reaction conditions include: the reaction temperature is 150-250 ℃, and the reaction time is 15-30 min.
Optionally, in the step 2, the stirring rate of the catalytic treatment is 80-150 r/min.
Optionally, the subjecting the catalytically treated mixed system to high-temperature centrifugation includes:
cooling the mixed system after the catalytic treatment to a preset temperature;
and (4) carrying out high-temperature centrifugation on the mixed system cooled to the preset temperature.
Optionally, the preset temperature is 60-100 ℃.
The invention provides a method for treating oily sludge. According to the treatment method, the titanium dioxide is used as the catalyst to catalyze the hydrothermal reaction to treat the oily sludge, so that the release of water and oil in the oily sludge is promoted, and the released oil can be recycled and recycled. And, in the treatment process, under the high temperature and high pressure conditions of the hydrothermal reaction, water in the oily sludge is converted into subcritical water, and titanium dioxide as a hydrogen production catalyst can react with the subcritical water to generate H2Based on the generated H2The method can promote the hydrocatalytic cracking of the petroleum hydrocarbon and realize the pollution-free lightening of the petroleum hydrocarbon (namely, converting heavy petroleum hydrocarbon into light petroleum hydrocarbon), thereby improving the harmless treatment efficiency and resource extraction efficiency of the oily sludge. Compared with the prior art, the treatment method provided by the invention at least has the following beneficial effects:
1. in the treatment method provided by the invention, the used titanium dioxide is commercial nano titanium dioxide with relatively low cost, and has higher catalytic activity and catalytic effect than the traditional acidic, alkaline and metal catalysts through titanium dioxide catalytic hydrothermal reaction.
2. In the treatment method provided by the invention, in the process of catalyzing the hydrothermal reaction by the titanium dioxide catalyst, the high-temperature and high-pressure conditions of the hydrothermal reaction can also synchronously excite the high catalytic activity of the titanium dioxide, an additional light source or a heating source is not needed for exciting the titanium dioxide, and the energy consumption requirement for exciting the catalytic performance of the titanium dioxide is reduced.
3. According to the treatment method provided by the invention, the titanium dioxide catalyst is used for improving the reaction activity, so that the temperature and the reaction time required by the hydrothermal reaction for treating the oily sludge can be reduced, and the oily sludge is reacted for 30min at the reaction temperature of 230 ℃, so that higher dehydration efficiency, oil removal efficiency and oil resource extraction efficiency can be realized. Compared with other heat treatment methods, the method provided by the invention has the advantages that the reaction temperature is obviously reduced, the energy consumption can be reduced, the cost is saved, the hard requirement on the operation condition is reduced, and the general applicability of the technology is improved. Therefore, the treatment method provided by the invention can realize high-efficiency treatment of the oily sludge in a short time.
4. According to the treatment method provided by the invention, the oily sludge is treated by the titanium dioxide catalytic hydrothermal reaction, so that not only can the moisture and oil content of the oily sludge be removed, but also the oil content (namely the light petroleum hydrocarbon converted from the heavy petroleum hydrocarbon) contained in the oily sludge can be extracted and reused, the treatment method is more in accordance with the resource utilization standard than the methods such as incineration and landfill, and the extracted oil content can also create higher economic value and reduce the catalytic treatment cost of the oily sludge.
In conclusion, the treatment method provided by the invention has the advantages of simplicity, easiness in implementation, low cost, no secondary environmental pollution, high recycling degree and the like. Therefore, the treatment method provided by the invention is suitable for treating various oily sludge generated in petrochemical industry, can realize reduction, harmless and recycling treatment and utilization of the oily sludge, and has wide application prospect.
Drawings
FIG. 1 shows a process flow diagram of a method of treatment of oily sludge in an embodiment of the invention;
FIG. 2 is a schematic diagram showing the operation of a method for treating oily sludge in the example of the present invention;
in fig. 2, the reactor is a temperature control detection device, a pressure gauge device, a stirring device and a reactor containing oil sludge and titanium dioxide catalyst.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents and other instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Hydrothermal methods have been used for waste biomass and sludge treatment, and the high efficiency of hydro-thermal dewatering of oily sludge has also been experimentally demonstrated. However, the prior art for treating oil-containing sludge based on a hydrothermal method still has the problems of complex operation process, long treatment period, secondary pollution and the like.
The nano titanium dioxide has the characteristics of no toxicity, stable property, corrosion resistance, high photocatalytic activity and the like, and can be used for catalytically degrading toxic and harmful organic matters; in addition, titanium dioxide as a semiconductor material can absorb heat energy and generate electron transition in a dark environment to show thermal catalysis performance, so that the titanium dioxide can be used as a catalyst to catalyze the degradation of polymers in a high-temperature and dark environment. Based on the above, the inventors propose a technical idea of improving the treatment efficiency of the oily sludge by catalyzing the hydrothermal reaction with the nano titanium dioxide as the catalyst. Based on the technical concept, the specific implementation contents are as follows:
the invention provides a treatment method of oily sludge, which comprises the following steps:
and S11, carrying out catalytic treatment on the oily sludge through catalytic hydrothermal reaction by using titanium dioxide as a catalyst. In specific implementation, as shown in fig. 1, the steps may include:
step 1(S101), titanium dioxide is used as a catalyst, and the titanium dioxide and the oily sludge are mixed to obtain a reaction system. Wherein the mass ratio of titanium dioxide to oily sludge can be 1-2: 100, preferably 1.5: 100. wherein, the titanium dioxide is commercially chemically pure nano titanium dioxide; the oily sludge is the original oily sludge waste without any pretreatment, and only needs to be uniformly stirred with a titanium dioxide catalyst without other pretreatment.
In actual operation, if the oily sludge has obvious water deposition, when the titanium dioxide is added into the oily sludge, the water deposited in the oily sludge can be firstly poured and removed, so that the oily sludge has no obvious water deposition, and then the titanium dioxide is added into the oily sludge.
And 2(S102), placing the reaction system in the step 1 in a hydrothermal reaction kettle, and carrying out catalytic treatment according to preset reaction conditions. The specific operation can be as follows: after the reaction system is placed in a hydrothermal reaction kettle, the temperature rise program and the reaction temperature of the hydrothermal reaction kettle are set, the reaction time of the hydrothermal reaction kettle at the reaction temperature is set, and the temperature rise and the catalytic treatment are carried out according to the set contents.
The temperature rise program comprises a stirring speed and a temperature rise speed, the stirring speed can be 80-150 r/min, the optimal stirring speed is 100r/min, and the temperature rise speed can be 3 ℃/min. The reaction temperature can be 150-250 ℃, preferably 230 ℃, and the reaction time can be 15-30 min, preferably 30 min. The reaction temperature is set to the highest temperature to which the hydrothermal reaction vessel needs to be heated, and the reaction time is the time required for the reaction to continue at the reaction temperature, and does not include the time required for the heating process.
And S12, performing high-temperature centrifugation on the mixed system after the catalytic treatment to obtain centrifugate and treated bottom mud.
During specific implementation, after catalytic treatment is finished, the reaction kettle is closed, natural cooling is carried out, the mixed system after catalytic treatment is cooled to a preset temperature, and then high-temperature centrifugation is carried out on the mixed system cooled to the preset temperature, so that a centrifugal liquid and treated bottom mud are obtained.
In the step, optionally, the preset temperature may be 60 to 100 ℃, and is preferably 100 ℃. The high temperature centrifugation parameters are set to 4000r/min and centrifugation is carried out for 20 min.
And S13, according to the principle that oil and water are immiscible, performing liquid-liquid separation on the centrifugate, and recovering to obtain water and oil.
In specific implementation, the centrifugate obtained after centrifugation is a water-oil mixture, and the oil component and the water component are two mutually incompatible phases, so that the centrifugate can be stood to obtain naturally separated oil phase and water phase, and then the centrifugate obtained by separating the oil phase and the water phase is subjected to liquid-liquid separation, so that the water component and the oil component can be recovered. The recovered oil can be recycled, and the recovered water can also be used in other scenes, so that the resource treatment and utilization of the oily sludge are realized.
In order to further realize resource treatment and utilization of the oily sludge, in this embodiment, optionally, the treatment method further includes: treating the treated bottom mud by a curing treatment method, a landfill method or a burning method; or the treated bottom mud is converted into recyclable low-quality soil.
It should be noted that, in the sludge after the titanium dioxide catalytic hydrothermal reaction treatment, the water content and the oil content in the centrifuged bottom sludge are extremely low, so that subsequent incineration, landfill and other treatments are directly performed, and no large secondary pollution is caused to the environment, or the bottom sludge is made into low-quality soil material for recycling (for example, the bottom sludge can be used for manufacturing cement, bricks and the like), so that too much landfill site resources are not wasted, and the environment is not greatly influenced.
In order to make the skilled person understand the treatment of the present invention better, in this embodiment, an operation schematic diagram of the treatment method is also provided, and fig. 2 shows an operation schematic diagram of a treatment method of oily sludge in the embodiment of the present invention, wherein, firstly, the temperature control detection device, secondly, the pressure gauge device, thirdly, the stirring device, and fourthly, the reactor of oily sludge and titanium dioxide catalyst. As shown in fig. 2, the processing method provided by the embodiment of the present invention may operate as follows: mixing a certain mass proportion of titanium dioxide (TiO)2) Mixing the waste water with the oily sludge to obtain a reactor containing the oily sludge and the titanium dioxide catalyst, placing the reactor in a hydrothermal reaction kettle, setting a temperature rise program, a reaction temperature and reaction time, and then carrying out temperature rise and catalytic treatment on the hydrothermal reaction kettle according to set conditions.
Wherein, accessible accuse temperature detection device detects the reaction temperature in the reation kettle and demonstrates for the operator, detects the pressure in the reation kettle through the manometer device, stirs the reactor through agitating unit. In practical operation, in this embodiment, the hydrothermal reaction is performed in a closed reaction kettle, so that it is not necessary to set the pressure in the reaction kettle in advance, the pressure in the kettle increases with the increase of the temperature after the temperature in the kettle increases, and the pressure in the kettle is about 0.3MPa during the period when the temperature in the kettle increases to the preset reaction temperature and the reaction is stabilized at the reaction temperature.
The treatment method provided by the embodiment of the invention has the advantages of simplicity, easiness in implementation, low cost, no secondary environmental pollution, high recycling degree and the like, is suitable for treating various oily sludge generated in petrochemical industry, can realize reduction, harmless and recycling treatment and utilization of the oily sludge, and has wide application prospect. Wherein, the reduction means: the original oily sludge has high content of water and oil and large volume of the sludge, and the treatment method provided by the embodiment can greatly reduce the mass and the volume of the sludge after removing the water and the oil, thereby realizing the reduction treatment.
In order to make the present invention more understandable to those skilled in the art, the method for treating oil-containing sludge provided by the present invention is illustrated by specific examples below.
Example 1
The embodiment designs the treatment effect of the method for treating the oily sludge by using titanium dioxide to catalyze the hydrothermal reaction, and the method specifically comprises the following steps:
the device for treating the oily sludge through the titanium dioxide catalyst catalytic hydrothermal reaction is a hydrothermal reaction kettle, the oily sludge is uniformly stirred, no obvious water is deposited, 500g of oil sludge is taken, the commercialized nano titanium dioxide and the stirred oil sludge are mixed according to the mass ratio of 1.5:100, the temperature rise parameter of the reaction kettle is set to be the temperature rise rate of 3 ℃/min, the stirring rate is 100r/min, the maximum reaction temperature is 230 ℃, and the reaction residence time is set to be 30 min. After the reaction is finished, the reaction kettle is closed, and the temperature is naturally reduced to 100 ℃. Taking about 300g of the mixture, centrifuging the mixture in a centrifuge at a high temperature, setting the centrifugation parameters to be 4000r/min, and centrifuging the mixture for 20 min. And (4) taking the centrifugate to measure the volume, taking the centrifugate and the bottom mud to measure the water content and the oil content, and calculating the dehydration rate, the oil content removal efficiency and the oil content extraction rate.
The results of treating the oily sludge by the titanium dioxide catalyst through the catalytic hydrothermal reaction are shown in table 1: the dehydration efficiency of the oily sludge is 36.55%, the oil removal efficiency of the oily sludge is 70.77%, and the resource extraction efficiency of the oil is 76.31%.
The oil content removal efficiency of the oily sludge is the removal ratio of the oil content concentration of the sludge before and after the oily sludge is treated, and the resource extraction efficiency (oil extraction rate) of the oil content is the ratio of the mass of the liquid phase extracted oil content after the treatment to the mass of the removed oil content.
Example 2
The embodiment designs the treatment effect of the method for treating the oily sludge by using titanium dioxide to catalyze the hydrothermal reaction, and the method specifically comprises the following steps:
the design of the titanium dioxide catalyst for catalyzing hydrothermal reaction to treat the oily sludge is the same as that of example 1. The difference is that the adding mass ratio of the titanium dioxide catalyst to the oily sludge is 1: 100.
The results of treating the oily sludge by the titanium dioxide catalyst through the catalytic hydrothermal reaction are shown in table 1: the dehydration efficiency of the oil-containing sludge was 36.92%, the oil removal efficiency of the oil-containing sludge was 42.81%, and the oil extraction efficiency as a resource was 46.71%.
Example 3
The embodiment designs the treatment effect of the method for treating the oily sludge by using titanium dioxide to catalyze the hydrothermal reaction, and the method specifically comprises the following steps:
the design of the titanium dioxide catalyst for catalyzing hydrothermal reaction to treat the oily sludge is the same as that of example 1. The difference is that the adding mass ratio of the titanium dioxide catalyst to the oily sludge is 2: 100.
The results of treating the oily sludge by the titanium dioxide catalyst through the catalytic hydrothermal reaction are shown in table 1: the dehydration efficiency of the oil-containing sludge is 36.14%, the oil removal efficiency of the oil-containing sludge is 57.75%, and the resource extraction efficiency of the oil is 57.80%.
Comparative example 1
The embodiment designs the treatment effect of the method for treating the oily sludge by using titanium dioxide to catalyze the hydrothermal reaction, and the method specifically comprises the following steps:
the design of the titanium dioxide catalyst for catalyzing hydrothermal reaction to treat the oily sludge is the same as that of example 1. The difference is that the mass ratio of the titanium dioxide catalyst to the oily sludge is 0:100 (namely, the titanium dioxide catalyst is not added).
The results of treating the oily sludge by the titanium dioxide catalyst through the catalytic hydrothermal reaction are shown in table 1: the dehydration efficiency of the oil-containing sludge is 35.90%, the oil removal efficiency of the oil-containing sludge is 13.86%, and the resource extraction efficiency of the oil is 15.57%.
The results of the examples and the comparative examples show that the oil removal efficiency and the resource extraction efficiency of the oily sludge can be remarkably improved by treating the oily sludge through the titanium dioxide catalyst in a catalytic hydrothermal reaction, the dehydration rate of the oily sludge is slightly improved, and the reduction, harmless and resource treatment of the oily sludge can be realized.
TABLE 1 results of treating oily sludge by catalytic hydrothermal reaction of titanium dioxide catalyst
Titanium dioxide catalyst: oily sludge Rate of dewatering Oil removal rate Oil extraction rate
Example 1 1.5:100 36.55％ 70.77％ 76.31％
Example 2 1:100 36.92％ 42.81％ 46.71％
Example 3 2:100 36.14％ 57.75％ 57.80％
Comparative example 1 0:100 35.90％ 13.86％ 15.57％
Wherein, the calculation formula of the dehydration rate is as follows: the dehydration rate is (raw sludge water content-bottom sludge water content)/raw sludge water content x 100%. The calculation formula of the oil removal efficiency is as follows: the oil removal efficiency is (crude mud oil content-bottom mud oil content)/crude mud oil content x 100%. The calculation formula of the oil extraction rate is as follows: the oil extraction rate is the mass of oil separated and extracted/mass of oil removed × 100%; the mass of the oil separated and extracted is the mass of the oil in the centrifugate, and the mass of the oil removed is (crude sludge oil content × crude sludge mass) - (bottom sludge oil content × bottom sludge mass). The raw sludge refers to oil-containing sludge before treatment, and the bottom sludge refers to bottom sludge obtained after centrifugation.
It should be noted that the steps and methods in the embodiments of the present application are not limited to the corresponding embodiments, and the details of the operations and the cautions of the embodiments are all corresponding to each other.
For simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will appreciate that the present invention is not limited by the order of acts or steps described, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art will also appreciate that the embodiments described in the specification are presently preferred and that no such operation or equipment is necessarily required.
The method for treating oily sludge provided by the invention is described in detail, the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. A method for treating oily sludge, which is characterized by comprising the following steps: titanium dioxide is used as a catalyst, and the oily sludge is subjected to catalytic treatment through catalytic hydrothermal reaction.
2. The processing method according to claim 1, characterized in that it further comprises:
carrying out high-temperature centrifugation on the mixed system after the catalytic treatment to obtain centrifugate and treated bottom mud;
and according to the principle that oil and water are immiscible, performing liquid-liquid separation on the centrifugate, and recovering the water and the oil.
3. The processing method according to claim 2, characterized in that it further comprises: treating the treated bottom mud by a curing treatment method, a landfill method or a burning method;
or converting the treated bottom mud into recyclable low-quality soil.
4. The process of claim 1, wherein the oily sludge is raw oily sludge waste that is not pretreated.
5. The treatment method according to claim 1, wherein the catalytic treatment of the oily sludge by catalytic hydrothermal reaction with titanium dioxide as a catalyst comprises:
step 1, mixing titanium dioxide and oily sludge by taking titanium dioxide as a catalyst to obtain a reaction system;
and 2, placing the reaction system in a hydrothermal reaction kettle, and carrying out catalytic treatment according to preset reaction conditions.
6. The treatment method according to claim 5, wherein in the step 1, the mass ratio of the titanium dioxide to the oily sludge is 1-2: 100.
7. the process of claim 5, wherein in the step 2, the preset reaction conditions comprise: the reaction temperature is 150-250 ℃, and the reaction time is 15-30 min.
8. The treatment method according to claim 5, wherein in the step 2, the stirring rate of the catalytic treatment is 80 to 150 r/min.
9. The process of claim 2, wherein said subjecting said catalytically treated mixed system to high temperature centrifugation comprises:
cooling the mixed system after the catalytic treatment to a preset temperature;
and (4) carrying out high-temperature centrifugation on the mixed system cooled to the preset temperature.
10. The process according to claim 9, wherein the predetermined temperature is 60 to 100 ℃.
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