CN113087185A - Oil sludge treatment method - Google Patents
Oil sludge treatment method Download PDFInfo
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- CN113087185A CN113087185A CN202110459651.7A CN202110459651A CN113087185A CN 113087185 A CN113087185 A CN 113087185A CN 202110459651 A CN202110459651 A CN 202110459651A CN 113087185 A CN113087185 A CN 113087185A
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
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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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
Abstract
The invention provides an oil sludge treatment method, which comprises the following steps: adding oil sludge and water into a flotation tank of a flotation device, wherein after a stirring mechanism of the flotation device stirs a mixture of the oil sludge and the water, an oil-liquid stock solution is separated from the upper layer of the flotation tank, water is separated from the middle layer, and a mud-water mixture is separated from the bottom layer; and mixing the oil liquid stock solution with hot water, and centrifuging the mixture of the oil liquid stock solution and the hot water by using a centrifugal device to further separate oil liquid, water and silt. The technical scheme provided by the invention can realize rapid separation of the oil sludge at normal temperature without adding a medicament, has simple separation mode and low energy consumption, and effectively solves the problems of high treatment cost caused by large medicament usage amount, high reaction temperature, high energy consumption and the like in the oil sludge thermochemical cleaning technology in the prior art.
Description
Technical Field
The application relates to an oil sludge treatment technology, in particular to an oil sludge treatment method.
Background
The oil sludge is derived from ground oil sludge, tank bottom oil sludge and refinery 'three sludge' formed in the processes of crude oil extraction, transportation, storage, extraction and the like. On one hand, the oil sludge contains carcinogenic, teratogenic and mutagenic substances, and on the other hand, the oil sludge contains a large amount of crude oil resources which can be recycled.
The conventional methods for separating oil sludge, such as a solvent extraction method, a chemical cleaning method and the like, are easy to treat oil sludge formed by crude oil with low average relative molecular mass; the oil sludge formed by crude oil with higher average relative molecular mass and higher viscosity has good treatment effect but high treatment cost by using the high-temperature pyrolysis method.
With continuous exploration and development of oil field resources in China, the oil sludge recycling and harmless treatment still face the challenges of high treatment temperature, incomplete treatment, large medicament consumption, high treatment cost, secondary pollution and the like. Although the related technical research of oil sludge recycling and harmlessness exists at home and abroad, there is a few engineering technical application cases which completely meet the requirements of complex oil sludge recycling and harmlessness.
Therefore, based on the research of the existing sludge treatment technology, a new method needs to be developed to reduce the cost of sludge treatment and accelerate the resource reuse and engineering application of sludge treatment.
Disclosure of Invention
The invention aims to solve the problems of large medicament consumption, high treatment cost, secondary pollution and the like in the conventional oil sludge treatment technology.
In order to achieve the above object, the present invention provides an oil sludge treatment method including:
adding oil sludge and water into a flotation tank of a flotation device, wherein after a stirring mechanism of the flotation device stirs a mixture of the oil sludge and the water, an oil-liquid stock solution is separated from the upper layer of the flotation tank, water is separated from the middle layer, and a mud-water mixture is separated from the bottom layer;
and mixing the oil liquid stock solution with hot water, and centrifuging the mixture of the oil liquid stock solution and the hot water by using a centrifugal device to further separate oil liquid, water and silt.
Preferably, the mass ratio of the oil sludge to the water added into the flotation device is 1: 10 to 12.
Preferably, the temperature of the mixture of the oil sludge and the water in the flotation device is 25-45 ℃.
Preferably, the stirring mechanism in the flotation device comprises a rotatable impeller, and the rotation speed of the impeller is 1300-1600 r/min.
Preferably, the temperature of the hot water is 75-85 ℃; and/or the weight ratio of the oil liquid stock solution to the hot water is 1: 3 to 5.
Preferably, the rotating speed of the centrifugal device is 3000-5000 r/min, and the rotating time is 4-10 min.
Preferably, the method for treating oil sludge further comprises:
separating the mud-water mixture to separate water and silt from the mud-water mixture;
and adding a Fenton reagent into the separated silt to carry out oxidation treatment on the silt.
Preferably, the separating the mud-water mixture includes:
settling the mud-water mixture, and separating the water at the upper layer from the silt at the lower layer after the mud-water mixture is settled;
or, the mud-water mixture is subjected to centrifugal treatment by a centrifugal device, and silt and water are separated from the mud-water mixture by centrifugal force.
Preferably, the fenton reagent comprises hydrogen peroxide and anhydrous ferrous sulfate, and the weight ratio of the hydrogen peroxide to the anhydrous ferrous sulfate to the silt is 100: 1: 62500.
preferably, the method for treating oil sludge further comprises:
and putting the water separated from the flotation device, the water separated from the centrifugal device and/or the water separated from the mud-water mixture into the flotation device for next flotation of the flotation device.
The technical scheme provided by the invention can realize rapid separation of the oil sludge at normal temperature without adding a medicament, has simple separation mode, low energy consumption and thorough oil sludge treatment, and effectively solves the problems of high treatment cost caused by large medicament usage amount, high reaction temperature, high energy consumption and the like in the oil sludge thermochemical cleaning technology in the prior art.
Drawings
Fig. 1 is a schematic view of a sludge treatment method according to an embodiment of the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and the like. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may also be otherwise oriented, such as by rotation through 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.
The invention provides a method for treating oil sludge, wherein the oil sludge is sludge containing oil, and the method for treating the oil sludge comprises the following steps:
adding oil sludge and water into a flotation tank of a flotation device, wherein after a stirring mechanism of the flotation device stirs a mixture of the oil sludge and the water, an oil-liquid stock solution is separated from the upper layer of the flotation tank, water is separated from the middle layer, and a mud-water mixture is separated from the bottom layer; wherein the oil stock solution contains oil, water and a small amount of silt;
and mixing the oil liquid stock solution with hot water, and carrying out centrifugal treatment on the mixed solution of the oil liquid stock solution and the hot water by adopting a centrifugal device to further separate oil liquid, water and silt. Preferably, the mass ratio of the oil sludge to the water added into the flotation device is 1: 10 to 12.
Preferably, the temperature of the mixture of the oil sludge and the water in the flotation device is 25-45 ℃, and the temperature of the mixture during flotation can be adjusted by adjusting the temperature of the added water.
The stirring mechanism in the flotation device comprises a rotatable impeller, the rotation speed of the impeller is preferably 1300-1600 r/min, the impeller is homogenized after stirring for a preset time, and in the stirring process, the impeller rotates at a high speed to suck air to generate bubbles, and the bubbles are entrained with an oil phase to float.
The method comprises the steps of separating oil liquid stock solution from the upper layer of a flotation tank, and particularly scraping the oil liquid floating up in the flotation tank out through continuous rotation of a scraper of a flotation device. Preferably, the time for floating the oil liquid from the upper layer of the flotation tank through the scraper is 20-35 min. Of course, the flotation time can also be varied as appropriate.
The residual oil rate of the slurry-water mixture floated in the flotation device can reach a level of less than 3%.
When the oil liquid stock solution is subjected to centrifugal treatment, the temperature of the hot water is preferably 75-85 ℃; the weight ratio of the oil to the hot water is 1: 3 to 5.
Preferably, the rotating speed of the centrifugal device is 3000-5000 r/min, and the rotating time is 4-10 min.
According to the technical scheme provided by the invention, firstly, a flotation device is adopted to carry out flotation on oil sludge based on a flotation principle, and the oil sludge is subjected to high-speed shearing in the stirring process of a stirring mechanism in the flotation device, so that the viscosity between crude oil and silt in the oil sludge is reduced, the crude oil floats upwards, an oil liquid stock solution, water and the silt can be separated, and the separated oil liquid stock solution is further separated into oil liquid, water and the silt by a centrifugal force through a centrifugal device. The method for treating the oil sludge is suitable for treating oil sludge containing much silt, such as tank bottom oil sludge.
The flotation device is a device for performing flotation on the slurry by using a flotation principle, which is well known to those skilled in the art, and the specific structure and the operation principle of the device are not described in detail herein.
The centrifuge device may be a three-phase horizontal centrifuge, which is also a device commonly used by those skilled in the art and will not be described in detail herein.
The technical scheme provided by the invention can realize rapid separation of the oil sludge at normal temperature without adding a medicament, has simple separation mode, low energy consumption and thorough oil sludge treatment, and effectively solves the problems of high treatment cost caused by large medicament usage amount, high reaction temperature, high energy consumption and the like in the oil sludge thermochemical cleaning technology in the prior art.
In the technical solution provided by the present invention, preferably, the oil sludge treatment method may further include:
separating the mud-water mixture to separate water and silt from the mud-water mixture;
and adding a Fenton reagent into the separated silt to carry out oxidation treatment on the silt.
In the oxidation treatment, specifically, the sludge may be placed in an oxidation apparatus which includes a reaction vessel and a stirring impeller for stirring the sludge, and which is to have corrosion resistance. Preferably, the rotation speed of the stirring impeller is set to be 50-300 r/min, and the time of the oxidation treatment is set to be 20-40 min, so that the oxidation can be fully realized.
The Fenton reagent comprises hydrogen peroxide and anhydrous ferrous sulfate, and preferably, the weight ratio of the hydrogen peroxide to the anhydrous ferrous sulfate to the silt is 100: 1: 62500.
carry out oxidation treatment to silt through fenton's reagent, can be so that the oil content of silt reaches emission standard, the required dosage of silt oxidation treatment is few moreover, has the significance to realizing resource utilization and innocent treatment of hazardous waste.
In one embodiment, the separating the mixture of mud and water comprises:
and settling the mud-water mixture for about 2-4 hours, separating the water at the upper layer from the silt at the lower layer after the mud-water mixture is settled, and adding a Fenton reagent into the separated silt.
In another embodiment, the mud-water mixture may be centrifuged by a centrifugal device, silt and water are separated from the mud-water mixture by centrifugal force, and then the separated silt is oxidized by adding fenton's reagent.
Fig. 1 schematically shows the process of a sludge treatment method according to an embodiment of the present invention.
Mixing the oil sludge to be treated with water, and performing flotation treatment by using a flotation device to separate oil liquid stock solution, water and sludge-water mixture;
wherein, the oil liquid stock solution is mixed with hot water, and the mixed solution of the oil liquid stock solution and the hot water is centrifuged by a centrifugal device to separate oil liquid, water and silt;
the mud-water mixture is settled or centrifuged to separate silt and water, and the silt is added with a Fenton reagent for oxidation treatment, so that the oxidized silt reaches the discharge standard.
In addition, in the technical scheme provided by the invention, the oil sludge treatment method further comprises the following steps:
and the water separated from the flotation device, the water separated from the centrifugal device and/or the water separated from the mud-water mixture are put into the flotation device to be used for next flotation of the flotation device, and the water separated from the oil sludge is recycled, so that resources can be saved, and the influence of harmful substances in the water on the environment is reduced.
The method of sludge treatment according to the present invention will be described below with reference to specific examples.
Example 1
The oil sludge is taken from oil sludge at the bottom of an island oil field tank, the oil content is 25%, the solid content is 47%, and the water content is 28%. Mixing oil sludge and water in a ratio of 1: 10, placing the mixture of the oil sludge and the water in the flotation tank in a proportion of 25 ℃, introducing air into the flotation tank, wherein the rotation speed of an impeller used for stirring in the flotation device is 1500r/min, scraping out oil liquid stock solution floating up in the flotation tank by a scraper in the stirring process, the time for the scraper to float the oil liquid stock solution is 25min, feeding the scraped oil liquid stock solution into an oil phase recovery tank, and pouring or flowing water below the oil liquid stock solution into a wastewater tank in an overflow mode;
pouring the oil liquid stock solution and hot water at 75 ℃ into a centrifugal device for mixing, wherein the weight ratio of the oil liquid stock solution to the hot water is 1: 4, centrifuging the mixture of the oil liquid stock solution and the hot water by using a centrifugal device, and separating oil liquid, water and silt by using centrifugal force, wherein the rotating speed of the centrifugal device is 3000r/min, and the rotating time is 10 min;
after the mud-water mixture at the lower part in the flotation tank is settled for 2 hours, separating out the water at the upper layer and the silt at the lower part; the separated water is poured into a wastewater tank, silt is placed into an oxidation device, a Fenton reagent (hydrogen peroxide: anhydrous ferrous sulfate: oil sludge: 100: 1: 62500) is placed into the oxidation device, then the mixture is stirred by a stirring impeller of the oxidation device, so that the silt is subjected to oxidation reaction, the rotation speed of the stirring impeller is 50r/min, after the reaction is carried out for 40min, the silt is placed into a solid phase recovery tank, and the silt and the sand are recycled.
Example 2
The oil sludge is taken from oil sludge at the bottom of an island oil field tank, the oil content is 25%, the solid content is 47%, and the water content is 28%. Mixing oil sludge and water in a ratio of 1: the method comprises the following steps of (11) placing the mixture of oil sludge and water in a flotation tank of a flotation device according to the proportion, wherein the temperature of the mixture of the oil sludge and the water placed in the flotation tank is about 45 ℃, introducing air into the flotation tank, the rotation speed of an impeller used for stirring in the flotation device is 1300r/min, scraping out oil liquid stock solution floating up in the flotation tank by a scraper in the stirring process, wherein the time of floating up the oil liquid stock solution by adopting the scraper for floatation is 35min, feeding the scraped oil liquid stock solution into an oil phase recovery tank, and pouring or flowing water below the oil liquid stock solution into a waste water tank in an overflow mode;
pouring the oil liquid stock solution and hot water with the temperature of 85 ℃ into a first centrifugal device for mixing, wherein the weight ratio of the oil liquid stock solution to the hot water is 1: 5, centrifuging the mixture of the oil liquid stock solution and the hot water through a centrifugal device, and separating oil liquid, water and silt through centrifugal force, wherein the rotating speed of the first centrifugal device is 5000r/min, and the rotating time is 4 min;
the mud-water mixture at the lower part in the flotation tank is put into a second centrifugal device for separation through centrifugal force; the rotating speed of the second centrifugal device is 1000r/min, and after the second centrifugal device rotates for 10min, the mud-water mixture is separated into silt and water; the separated water is poured into a wastewater tank, silt is placed into an oxidation device, a Fenton reagent (hydrogen peroxide: anhydrous ferrous sulfate: oil sludge: 100: 1: 62500) is placed into the oxidation device, then stirring is carried out through a stirring impeller of the oxidation device, so that the silt is subjected to oxidation reaction, the rotating speed of the stirring impeller is set to be 300r/min, after the reaction is carried out for 20min, the oil content of the silt reaches the discharge standard, and the silt is placed into a solid phase recovery tank for recycling the silt.
Example 3
The oil sludge is taken from oil sludge at the bottom of an island oil field tank, the oil content is 25%, the solid content is 47%, and the water content is 28%. Mixing oil sludge and water in a ratio of 1: 12, placing the mixture of the oil sludge and the water in the flotation tank in a proportion in a flotation tank of a flotation device, wherein the temperature of the mixture of the oil sludge and the water placed in the flotation tank is about 35 ℃, introducing air into the flotation tank, the rotation speed of an impeller used for stirring in the flotation device is 1450r/min, scraping out the oil liquid stock solution floating up in the flotation tank by a scraper in the stirring process, the time of floating up the oil liquid stock solution by the scraper in the flotation process is 30min, feeding the scraped oil liquid stock solution into an oil phase recovery tank, and pouring or flowing water below the oil liquid stock solution into a waste water tank in an overflow mode;
pouring the oil liquid stock solution and hot water at 82 ℃ into a centrifugal device for mixing, wherein the weight ratio of the oil liquid stock solution to the hot water is 1: 3.5, centrifuging the mixture of the oil liquid stock solution and the hot water by using a centrifugal device, and separating oil liquid, water and silt by using centrifugal force, wherein the rotating speed of the centrifugal device is 4500r/min, and the rotating time is 8 min;
after the mud-water mixture at the lower part in the flotation tank is settled for 4 hours, separating out the upper-layer water and the lower silt; the separated water is poured into a wastewater tank, silt is placed into an oxidation device, a Fenton reagent (hydrogen peroxide: anhydrous ferrous sulfate: oil sludge: 100: 1: 62500) is placed into the oxidation device, then the mixture is stirred by a stirring impeller of the oxidation device, so that the silt is subjected to oxidation reaction, the rotation speed of the stirring impeller is 200r/min, after the reaction is carried out for 35min, the silt is placed in a solid phase recovery tank, and the silt and the sand are recycled.
Example 4
The oil sludge is taken from oil sludge at the bottom of an island oil field tank, the oil content is 25%, the solid content is 47%, and the water content is 28%. Mixing oil sludge and water in a ratio of 1: 10.5, placing the mixture of the oil sludge and the water in a flotation tank of a flotation device, wherein the temperature of the mixture of the oil sludge and the water in the flotation tank is about 38 ℃, introducing air into the flotation tank, the rotation speed of an impeller used for stirring in the flotation device is 1600r/min, scraping out the oil liquid stock solution floating up in the flotation tank by a scraper in the stirring process, the time of floating up the oil liquid stock solution by the scraper is 20min, feeding the scraped oil liquid stock solution into an oil phase recovery tank, and pouring or flowing the water below the oil liquid stock solution into a wastewater tank in an overflow mode;
pouring the oil liquid stock solution and hot water of 78 ℃ into a first centrifugal device for mixing, wherein the weight ratio of the oil liquid stock solution to the hot water is 1: 3.5, centrifuging the mixture of the oil liquid stock solution and the hot water through a centrifugal device, and separating oil liquid, water and silt through centrifugal force, wherein the rotating speed of the first centrifugal device is 3800r/min, and the rotating time is 5 min;
the mud-water mixture at the lower part in the flotation tank is put into a second centrifugal device for separation through centrifugal force; the rotating speed of the second centrifugal device is 800r/min, and after the second centrifugal device rotates for 12min, the mud-water mixture is separated into silt and water; the separated water is poured into a wastewater tank, silt is placed into an oxidation device, a Fenton reagent (hydrogen peroxide: anhydrous ferrous sulfate: oil sludge: 100: 1: 62500) is placed into the oxidation device, then the silt is stirred by a stirring impeller of the oxidation device to carry out oxidation reaction, the rotation speed of the stirring impeller is set to be 150r/min, after 26min of reaction, the oil content of the silt reaches the discharge standard, and the silt is placed into a solid phase recovery tank to carry out resource utilization of the silt.
Example 5
The oil sludge is taken from oil sludge at the bottom of an island oil field tank, the oil content is 25%, the solid content is 47%, and the water content is 28%. Mixing oil sludge and water in a ratio of 1: the mixture of the oil sludge and the water is placed in a flotation tank of a flotation device according to the proportion of 11.5, the temperature of the mixture of the oil sludge and the water placed in the flotation tank is about 42 ℃, air is introduced into the flotation tank, the rotation speed of an impeller used for stirring in the flotation device is 1350r/min, an oil liquid stock solution floating up in the flotation tank is scraped out by a scraper in the stirring process, the time of floating up the oil liquid stock solution by adopting the scraper for flotation is 32min, the scraped oil liquid stock solution enters an oil phase recovery tank, and the water below the oil liquid stock solution is poured out or flows into a wastewater pool in an overflow mode;
pouring the oil liquid stock solution and hot water at 75 ℃ into a centrifugal device for mixing, wherein the weight ratio of the oil liquid stock solution to the hot water is 1: 4.2, centrifuging the mixture of the oil liquid stock solution and the hot water through a centrifugal device, and separating oil liquid, water and silt through centrifugal force, wherein the rotating speed of the centrifugal device is 4500r/min, and the rotating time is 7 min;
after the mud-water mixture at the lower part in the flotation tank is settled for 3.5 hours, separating out the upper-layer water and the lower silt; the separated water is poured into a wastewater tank, silt is placed into an oxidation device, a Fenton reagent (hydrogen peroxide: anhydrous ferrous sulfate: oil sludge: 100: 1: 62500) is placed into the oxidation device, then the mixture is stirred by a stirring impeller of the oxidation device to enable the silt to be subjected to oxidation reaction, the rotation speed of the stirring impeller is set to be 100r/min, the reaction lasts for 28min, and then the silt is placed into a solid phase recovery tank to recycle the silt.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (10)
1. A method of sludge treatment, comprising:
adding oil sludge and water into a flotation tank of a flotation device, wherein after a stirring mechanism of the flotation device stirs a mixture of the oil sludge and the water, an oil-liquid stock solution is separated from the upper layer of the flotation tank, water is separated from the middle layer, and a mud-water mixture is separated from the bottom layer;
and mixing the oil liquid stock solution with hot water, and centrifuging the mixture of the oil liquid stock solution and the hot water by using a centrifugal device to further separate oil liquid, water and silt.
2. The sludge treatment method of claim 1, wherein the mass ratio of sludge to water added to the flotation unit is 1: 10 to 12.
3. The sludge treatment method according to claim 1, wherein the temperature of the mixture of sludge and water in the flotation device is 25 to 45 ℃.
4. The sludge treatment method of claim 1, wherein the stirring mechanism in the flotation device comprises a rotatable impeller, and the rotation speed of the impeller is 1300-1600 r/min.
5. The sludge treatment process of claim 1 wherein the hot water has a temperature of 75-85 ℃; and/or the weight ratio of the oil liquid stock solution to the hot water is 1: 3 to 5.
6. The sludge treatment method according to claim 1, wherein the rotation speed of the centrifugal device is 3000 to 5000r/min, and the rotation time is 4 to 10 min.
7. The sludge treatment process of any one of claims 1 to 6, further comprising:
separating the mud-water mixture to separate water and silt from the mud-water mixture;
and adding a Fenton reagent into the separated silt to carry out oxidation treatment on the silt.
8. The sludge treatment process of claim 7 wherein said separating the sludge-water mixture comprises:
settling the mud-water mixture, and separating the water at the upper layer from the silt at the lower layer after the mud-water mixture is settled;
or, the mud-water mixture is subjected to centrifugal treatment by a centrifugal device, and silt and water are separated from the mud-water mixture by centrifugal force.
9. The sludge treatment method of claim 7 wherein the Fenton's reagent comprises hydrogen peroxide and anhydrous ferrous sulfate, and the weight ratio of the hydrogen peroxide to the anhydrous ferrous sulfate to the silt is 100: 1: 62500.
10. the sludge treatment process of claim 7 further comprising:
and putting the water separated from the flotation device, the water separated from the centrifugal device and/or the water separated from the mud-water mixture into the flotation device for next flotation of the flotation device.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102627381A (en) * | 2012-04-26 | 2012-08-08 | 陕西科技大学 | Two-step method resource treatment process for sludge containing oil |
| CN104671625A (en) * | 2015-02-12 | 2015-06-03 | 绿野工程私人有限公司 | Oil sludge and sand recycling system and oil sludge and sand thermochemistry phase slitting treatment device |
| WO2020022871A1 (en) * | 2018-07-25 | 2020-01-30 | Тоо "Reef Центробежные Технологии" | Method for processing oil-containing waste |
| CN111606531A (en) * | 2020-06-15 | 2020-09-01 | 山东理工大学 | Low-temperature enhanced separation method for oil-containing sludge |
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2021
- 2021-04-27 CN CN202110459651.7A patent/CN113087185A/en active Pending
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| CN102627381A (en) * | 2012-04-26 | 2012-08-08 | 陕西科技大学 | Two-step method resource treatment process for sludge containing oil |
| CN104671625A (en) * | 2015-02-12 | 2015-06-03 | 绿野工程私人有限公司 | Oil sludge and sand recycling system and oil sludge and sand thermochemistry phase slitting treatment device |
| WO2020022871A1 (en) * | 2018-07-25 | 2020-01-30 | Тоо "Reef Центробежные Технологии" | Method for processing oil-containing waste |
| CN111606531A (en) * | 2020-06-15 | 2020-09-01 | 山东理工大学 | Low-temperature enhanced separation method for oil-containing sludge |
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