CN115583780A - Oily sludge treatment method - Google Patents
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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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/0217—Separation of non-miscible liquids by centrifugal force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/04—Breaking emulsions
- B01D17/045—Breaking emulsions with coalescers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/04—Breaking emulsions
- B01D17/047—Breaking emulsions with separation aids
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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
- C02F11/02—Biological treatment
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
- C02F2103/365—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds from petrochemical industry (e.g. refineries)
Abstract
The invention relates to an oily sludge treatment method, which comprises the steps of adding an auxiliary agent and a demulsifier into oily sludge for demulsification treatment, separating by a cyclone separator, degrading by microbial degrading bacteria, and performing oxidative decomposition by heat treatment to feed oil in the oily sludgeThe oil sludge is thoroughly treated, the oil, the water and the sludge are thoroughly separated, the oil product is recycled to the maximum extent, the energy consumption is low, the oil content in the oil sludge is controlled to be below 20% by adopting a physical and chemical method at the front end, then the oil product is continuously treated by adopting microbial degradation bacteria, and a small amount of oil stain in the sludge is oxidized and decomposed into CO by adopting micro-thermal oxidation treatment 2 And water, the oil content of the treated sludge is controlled to be below 0.3%, and the finally performed dehydration treatment and low-temperature drying are combined, so that the harmless treatment of the oil-containing sludge is really realized, the strictest standard at present is met, and the hazardous waste treatment cost can be greatly reduced.
Description
Technical Field
The invention relates to the technical field of oily sludge treatment, in particular to a method for treating oily sludge.
Background
Oil sludge is an oil-containing solid waste produced in the processes of crude oil exploration, exploitation, gathering, transportation, storage and refining. With the rapid development of the petroleum industry, the oil sludge yield is increasing. Untreated oil sludge not only occupies a large amount of land resources if it is discharged directly without being treated correctly, but also is rich in heavy metals and bacterial viruses in large amounts, and can cause severe environmental pollution of water bodies, soil layers and atmospheric environments due to malodors. The treatment technology of the oily sludge is applied in many stages at present, but the treatment technology has economic timeliness by adopting a physical and chemical method according to the specified requirements of reduction, harmlessness, resource utilization and comprehensive utilization.
Oily sludge such as oil sludge at the bottom of an adjusting tank, bottom sludge of an oil separation tank, floating slag of an air flotation tank, bottom sludge and the like can be generated in the front pretreatment process of the sewage treatment device of each oil extraction plant and refinery enterprise, and a large amount of tank bottom oil sludge can be generated in a raw material tank area when the tank area is overhauled. The oil sludge is oil-containing sludge, belongs to hazardous waste, and particularly has large oil content in oil sludge at the bottom of the regulating tank and oil sludge at the bottom of the raw material tank, part of the oil sludge is still in an emulsified state, and oil, water and sludge are mixed into a whole. Above fatlute if adopting directly to get into and fold spiral shell filter press and carry out the filter-pressing and handle, the effect is extremely poor, and moisture content can't the filter-pressing come out, and the filter-pressing goes out mud and is liquid completely, can't satisfy follow-up mummification and handles the requirement, and on the one hand the oil content is too big, has the potential safety hazard, and on the other hand the decrement is too little, and dangerous waste disposal cost is too high.
Disclosure of Invention
The invention aims to provide a method for treating oily sludge, which can effectively treat oil in the oily sludge and meet the requirement of environmental protection.
In order to achieve the purpose, the invention provides the following technical scheme: a method for treating oily sludge comprises the following steps:
the method comprises the following steps: and (2) oil-water separation, namely adding the oily sludge into an oil-water separation tank, adding the mixed auxiliary agent and demulsifier according to the proportion of 1-10 per mill of the total weight of the oily sludge to perform demulsification treatment, setting the pH value to be 1.5-3.0, fully stirring to uniformly mix the oily sludge and the demulsifier, setting the stirring temperature to be 50-80 ℃, then standing for precipitation, and setting the standing time to be 15-60 min. The demulsifier is selected from one or more of nonionic surfactant, cationic surfactant, anionic surfactant and electrolyte. And (3) separating oil and water in the oily sludge through demulsification treatment to obtain dehydrated oily sludge and filtrate, and performing suction filtration on the filtrate to discharge. The demulsifier is added into the oil sludge, so that the demulsified oil sludge is subjected to standing dehydration, and the water content of the oil sludge can be effectively reduced, so that the subsequent oil sludge separation is facilitated.
Step two: and (3) oil stain separation, namely separating the dewatered oily sludge by using a cyclone separator, and separating oil stains from other impurities to obtain deoiled sludge and oil stains.
Step three: and (4) the deoiled sludge passes through a coalescence degreaser to further improve the oil stain separation effect, so as to obtain secondary deoiled sludge.
Step four: and (3) microbial degradation, namely performing microbial degradation on the secondary deoiled sludge in a microbial treatment tank, and adopting microbial degradation bacteria, wherein the microorganisms utilize petroleum hydrocarbon as a carbon source to perform assimilation degradation, and finally completely mineralize the sludge and convert the sludge into harmless inorganic substances. Wherein the addition amount of the microbial degradation bacteria is 2-10% of the total weight of the oily sludge, and the microbial degradation bacteria adopt petroleum degradation bacteria which can efficiently decompose the oily sludge and are rich in aerobic bacteria and anaerobic bacteria. The aerobic bacteria are positioned in an aeration aerobic environment at the upper part of the treatment tank to adsorb, decompose and metabolize the oil and decompose the organic oil. Anaerobic bacteria decompose and break the bottom oil of the bottom organic sludge in an anaerobic environment at the bottom of the treatment tank. The inside of the microbial treatment tank body is provided with an aeration pipe, and aeration holes are uniformly distributed on the aeration pipe, so that sufficient oxygen can be provided for aerobic microorganisms on the surface layer of oil stain. Preferably, be equipped with the screen cloth in the microbial treatment jar, can make the greasy dirt that flows in separate with the impurity in the greasy dirt through using the screen cloth, increase abluent efficiency, screen cloth structural shape sets up to protruding type, makes the debris in the greasy dirt can the landing around, utilizes the brush clearance to make the impurity of greasy dirt can not remain among the mesh of screen cloth, through the screen cloth, can make the effectual separation of greasy dirt and debris and clearance.
Step five: heat treatment, namely placing the sludge treated in the fourth step into a micro thermal oxidation tank for continuous treatment, controlling the heat treatment temperature to be 100-300 ℃ and the heat treatment time to be 2-3 h, and oxidizing and decomposing a small amount of oil stains in the sludge into CO by adopting the thermal oxidation treatment 2 And water, the oil content in the treated sludge/solid waste can be controlled below 0.3 percent.
Step six: and (4) dewatering treatment, namely dewatering the sludge after the purification treatment is finished.
Step seven: and low-temperature drying, namely performing low-temperature drying on the purified sludge to deeply dehydrate the sludge, wherein the low-temperature drying temperature is preferably controlled to be 50-75 ℃, and the low-temperature drying is adopted, so that the energy is saved and the safety is ensured.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a catalyst containingThe oil sludge treatment method can thoroughly treat oil in the oil-containing sludge by combining physical and chemical treatment, biological treatment and thermal treatment, realizes the thorough separation of oil, water and sludge, maximally recovers oil products, has low energy consumption, adopts the physical and chemical method to control the oil content in the oil sludge to be below 20 percent at the front end, then adopts microbial degradation bacteria to continuously treat the oil products, and adopts the micro-thermal oxidation treatment to oxidize and decompose a small amount of oil stains in the sludge into CO 2 And water, the oil content of the treated sludge is controlled to be below 0.3%, and the finally performed dehydration treatment and low-temperature drying are combined, so that the harmless treatment of the oil-containing sludge is really realized, the strictest standard at present is met, and the hazardous waste treatment cost can be greatly reduced.
Drawings
FIG. 1 is a schematic flow diagram of the oily sludge treatment method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Referring to fig. 1, the invention discloses a method for treating oily sludge, wherein the treated oily sludge comprises, but is not limited to, ground sludge, tank bottom oil sludge and tank cleaning sludge of an oil extraction plant or a refining enterprise, and oily solid waste of a sewage treatment plant. According to the method for treating the oily sludge, the oily sludge is subjected to oil-water separation treatment, oil-sludge separation treatment, biological treatment and heat treatment in sequence, so that the oily sludge can be effectively treated and purified, oil, water and sludge are thoroughly separated, an oil product is recycled to the maximum extent, and the oil content of the treated sludge can be controlled to be below 0.3%.
Specifically, the processing method comprises the following steps:
the method comprises the following steps: and (3) oil-water separation, namely adding the oily sludge into an oil-water separation tank, adding the mixed auxiliary agent and the demulsifier according to a certain proportion to perform demulsification treatment, fully stirring to uniformly mix the oily sludge and the demulsifier, and then standing for precipitation. And (3) separating oil and water in the oily sludge through demulsification treatment to obtain dehydrated oily sludge and filtrate, and performing suction filtration on the filtrate to discharge.
In the first step, the mixing addition amount of the auxiliary agent and the demulsifier is 1-10 per mill of the total weight of the oily sludge, wherein the demulsifier is selected from one or more of nonionic surfactant, cationic surfactant, anionic surfactant and electrolyte. The demulsification environment is set as follows: setting the PH value to be 1.5-3.0, setting the stirring temperature to be 50-80 ℃, and setting the standing time to be 15-60 min.
According to the invention, the demulsifier is added into the oil sludge, so that the demulsified oil sludge is subjected to standing dehydration, the water content of the oil sludge can be effectively reduced, and the subsequent oil sludge separation is facilitated.
Preferably, in the first step, before the oil-water separation of the oil sludge, the oil sludge is subjected to a sieving filtration treatment to control the particle size of the oil sludge.
Step two: and (3) oil stain separation, namely separating the dewatered oily sludge by using a cyclone separator, and separating oil stains from other impurities to obtain deoiled sludge and oil stains.
Step three: and (4) the deoiled sludge passes through a coalescence degreaser to further improve the oil stain separation effect, so as to obtain secondary deoiled sludge.
In the third step, the coalescence degreaser utilizes the characteristic that the affinity of oil and water is greatly different from each other on the surface of the coalescence material, when the coalescence degreaser is used, the coalescence material is filled in the coalescence degreaser, when the deoiled sludge flows through, the tiny oil particles are adsorbed on the surface or in pores of the coalescence material, the tiny oil particles gradually form an oil film on the surface of the coalescence material along with the increase of the quantity of the adsorbed oil particles, and the oil film is deformed into larger oil drops and separated after reaching a certain thickness.
Through the three steps, the oil content in the oil-containing sludge can be controlled to be below 20 percent.
Step four: and (3) microbial degradation, namely performing microbial degradation on the secondary deoiled sludge in a microbial treatment tank, and adopting microbial degradation bacteria, wherein the microorganisms utilize petroleum hydrocarbon as a carbon source to perform assimilation degradation, and finally completely mineralize the sludge and convert the sludge into harmless inorganic substances.
In the fourth step, the addition amount of the microbial degradation bacteria is 2-10% of the total weight of the oily sludge, the microbial degradation bacteria adopt petroleum degradation bacteria capable of efficiently decomposing the oily sludge, and the petroleum degradation bacteria are commercially available and are rich in aerobic bacteria and anaerobic bacteria. The aerobic bacteria are in an aerobic environment of aeration at the upper part of the treatment tank, and are used for adsorbing, decomposing and metabolizing the oil so as to decompose the organic oil. Anaerobic bacteria decompose and break the bottom oil of the bottom organic sludge in an anaerobic environment at the bottom of the treatment tank. The inside of the microbial treatment tank body is provided with an aeration pipe, and aeration holes are uniformly distributed on the aeration pipe, so that enough oxygen can be provided for aerobic microorganisms on the surface layer of oil stains. Preferably, be equipped with the screen cloth in the microbial treatment jar, can make the greasy dirt that flows in and the impurity in the greasy dirt separate through using the screen cloth, increase abluent efficiency, screen cloth structural shape sets up to protruding type, makes the debris in the greasy dirt can the landing around, utilizes the brush clearance to make the impurity of greasy dirt can not remain among the mesh of screen cloth, through the screen cloth, can make the effectual separation of greasy dirt and debris and clearance.
Step five: and (4) heat treatment, namely placing the sludge treated in the fourth step into a micro thermal oxidation tank for continuous treatment, and oxidizing and decomposing a small amount of oil stains in the sludge into CO by adopting thermal oxidation treatment 2 And water, the oil can be further reduced by the heat treatment stepThe oil content in the sludge can be controlled below 0.3 percent after treatment.
In the fifth step, the heat treatment temperature is controlled to be 100-300 ℃ and the heat treatment time is controlled to be 2-3 h in the micro-thermal oxidation tank.
Step six: and (4) dewatering treatment, namely dewatering the sludge after the purification treatment is finished.
Step seven: and (3) low-temperature drying, namely performing low-temperature drying on the purified sludge to deeply dehydrate the sludge.
And seventhly, drying and dehydrating the dehydrated sludge at low temperature by using hot air, wherein the temperature of the low-temperature drying is controlled to be 50-75 ℃.
The present invention is further described in detail with reference to the following examples, which should also be understood as being limited to the following examples, which are provided only for the purpose of illustration and are not to be construed as limiting the scope of the present invention. The specific process parameters and the like of the following examples are also only one example of suitable ranges, i.e., those skilled in the art can select the appropriate ranges through the description herein, and are not limited to the specific values exemplified below.
Example one
Selecting oil sludge falling to the ground of an oil production plant for treatment, wherein the oil content of the oil sludge is 25 percent, and the treatment steps are as follows:
the method comprises the following steps: and (2) oil-water separation, namely adding the oily sludge into an oil-water separation tank, adding the mixed auxiliary agent and demulsifier according to 1 per mill of the total weight of the oily sludge to perform demulsification treatment, setting the pH value to be 3.0, fully stirring to uniformly mix the oily sludge, setting the stirring temperature to be 50 ℃, then standing for precipitation, setting the standing time to be 60min to obtain dehydrated oily sludge and filtrate, and performing suction filtration and discharge on the filtrate.
Step two: and (3) oil stain separation, namely separating the dewatered oily sludge by using a cyclone separator, and separating oil stains from other impurities to obtain deoiled sludge and oil stains.
Step three: and (4) the deoiled sludge passes through a coalescence degreaser to further improve the oil stain separation effect, so as to obtain secondary deoiled sludge.
Step four: and (3) performing microbial degradation, namely performing microbial degradation on the secondary deoiled sludge in a microbial treatment tank, wherein the addition amount of microbial degradation bacteria is 10 percent of the total weight of the oily sludge.
Step five: and (4) performing heat treatment, namely putting the sludge treated in the step four into a micro-thermal oxidation tank for continuous treatment, wherein the heat treatment temperature is controlled to be about 100 ℃, and the heat treatment time is controlled to be 2 hours.
Step six: and (4) dewatering treatment, namely dewatering the sludge after the purification treatment is finished.
Step seven: and (3) low-temperature drying, namely performing low-temperature drying on the sludge subjected to purification treatment, wherein the temperature of the low-temperature drying is controlled at 75 ℃.
Through the steps, the oil content of the oil sludge falling to the ground is controlled to be 0.21%.
Example two
Selecting tank bottom oil sludge for treatment, wherein the oil content of the oil sludge is 38%, and the treatment steps are as follows:
the method comprises the following steps: and (2) oil-water separation, namely adding the oily sludge into an oil-water separation tank, adding the mixed auxiliary agent and demulsifier according to 10 per mill of the total weight of the oily sludge to perform demulsification treatment, setting the pH value to be 1.5, fully stirring to uniformly mix the oily sludge, setting the stirring temperature to be 80 ℃, then standing for precipitation, setting the standing time to be 15min to obtain dehydrated oily sludge and filtrate, and performing suction filtration and discharge on the filtrate.
Step two: and (3) oil stain separation, namely separating the dewatered oily sludge by using a cyclone separator, and separating oil stains from other impurities to obtain deoiled sludge and oil stains.
Step three: and (4) the deoiled sludge passes through a coalescence degreaser to further improve the oil stain separation effect, so as to obtain secondary deoiled sludge.
Step four: and (3) performing microbial degradation, namely performing microbial degradation on the secondary deoiled sludge in a microbial treatment tank, wherein the addition amount of microbial degradation bacteria is 2 percent of the total weight of the oily sludge.
Step five: and (4) heat treatment, namely placing the sludge treated in the fourth step into a micro-thermal oxidation tank for continuous treatment, wherein the heat treatment temperature is controlled to be about 300 ℃, and the heat treatment time is controlled to be 3 hours.
Step six: and (4) dewatering treatment, namely dewatering the sludge after the purification treatment is finished.
Step seven: and (3) low-temperature drying, namely drying the sludge subjected to purification treatment at low temperature, wherein the temperature of the low-temperature drying is controlled at 75 ℃.
Through the steps, the oil content of the oil sludge falling to the ground is controlled to be 0.18 percent.
EXAMPLE III
Selecting oil-containing solid waste of a sewage treatment plant for treatment, wherein the oil content of the oil sludge is 32%, and the treatment steps are as follows:
the method comprises the following steps: and (2) oil-water separation, namely adding the oily sludge into an oil-water separation tank, adding the mixed auxiliary agent and demulsifier according to 6 per thousand of the total weight of the oily sludge, performing emulsion breaking treatment, setting the pH value to be 2.0, fully stirring to uniformly mix the oily sludge, setting the stirring temperature to be 70 ℃, standing for precipitation, setting the standing time to be 45min, obtaining dehydrated oily sludge and filtrate, and performing suction filtration and discharge on the filtrate.
Step two: and (3) oil stain separation, namely separating the dewatered oily sludge by using a cyclone separator, and separating oil stains from other impurities to obtain deoiled sludge and oil stains.
Step three: and (4) the deoiled sludge passes through a coalescence degreaser to further improve the oil stain separation effect, so as to obtain secondary deoiled sludge.
Step four: and (3) performing microbial degradation, namely performing microbial degradation on the secondary deoiled sludge in a microbial treatment tank, wherein the addition amount of microbial degradation bacteria is 6 percent of the total weight of the oily sludge.
Step five: and (4) performing heat treatment, namely putting the sludge treated in the step four into a micro-thermal oxidation tank for continuous treatment, wherein the heat treatment temperature is controlled to be about 180 ℃, and the heat treatment time is controlled to be 2.5 hours.
Step six: and (4) dewatering treatment, namely dewatering the sludge after the purification treatment is finished.
Step seven: and (3) low-temperature drying, namely drying the sludge subjected to purification treatment at low temperature, wherein the temperature of the low-temperature drying is controlled at 75 ℃.
Through the steps, the oil content of the oil sludge falling to the ground is controlled to be 0.13%.
The oily sludge treatment method provided by the invention can thoroughly treat oil in the oily sludge by a method combining physical and chemical treatment, biological treatment and heat treatment, has low energy consumption, adopts the physical and chemical method to control the oil content in the oily sludge to be below 20% at the front end, then adopts microbial degrading bacteria to continuously treat oil, and adopts micro-thermal oxidation treatment to oxidize and decompose a small amount of oil stains in the sludge into CO 2 And water, the oil content of the treated sludge is controlled to be below 0.3 percent, and the harmless treatment of the oil-containing sludge is really realized by combining the final dehydration treatment and low-temperature drying, so that the current strictest standard is met.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The method for treating the oily sludge is characterized by comprising the following steps of:
step one, oil-water separation, namely adding an auxiliary agent and a demulsifier into oily sludge for demulsification treatment, stirring, standing and precipitating to obtain dehydrated oily sludge and filtrate;
separating oil stains, namely separating the dehydrated oil-containing sludge through a cyclone separator to obtain deoiled sludge and oil stains;
step three, performing microbial degradation, namely degrading the deoiled sludge by using microbial degradation bacteria;
and step four, heat treatment, namely, carrying out heat treatment on the sludge treated in the step three.
2. The method for treating oily sludge according to claim 1, further comprising the step of passing the deoiled sludge through a coalescence degreaser to obtain a secondary deoiled sludge between the second step and the third step.
3. The method for treating oily sludge according to claim 1, wherein in the first step, the addition amount of the additive and the demulsifier is 1 to 10% by weight of the total weight of the oily sludge.
4. The method for treating oily sludge according to claim 1, wherein in the first step, the demulsifier is selected from one or more of nonionic surfactant, cationic surfactant, anionic surfactant and electrolyte.
5. The method for treating oily sludge according to claim 1, wherein in the first step, the demulsification environment is as follows: setting the PH value to be 1.5-3.0, setting the stirring temperature to be 50-80 ℃ and setting the standing time to be 15-60 min.
6. The method for treating oily sludge according to claim 1, wherein the amount of the microbial degradation bacteria added in the third step is 2 to 10% of the total weight of the oily sludge.
7. The method for treating oily sludge according to claim 1, wherein in the third step, the deoiled sludge is subjected to microbial degradation in a microbial treatment tank, and a screen is provided in the microbial treatment tank.
8. The method for treating oily sludge according to claim 1, wherein in the fourth step, the heat treatment temperature is controlled to be 100 to 300 ℃ and the heat treatment time is controlled to be 2 to 3 hours.
9. The method according to claim 1, wherein the sludge is subjected to a dehydration treatment after the fourth step.
10. The method according to claim 1, wherein the sludge is subjected to low-temperature drying treatment after dehydration treatment.
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