Physico-chemical hot washing environment-friendly process for oily sludge

Abstract

This invention belongs to the field of environmental protection technology for oily sludge treatment, and provides an environmentally friendly physicochemical thermal washing process for oily sludge. The process includes the following steps: S1, mixing the oily sludge with a chemical solution and then sequentially performing coarse washing and fine washing to obtain oily sludge and muddy water; S2, rinsing the muddy water obtained in step S1 twice to obtain oily sludge and mud slurry; S3, allowing the mud slurry obtained in step S2 to stand and separate to obtain water and sludge; S4, sequentially pressing and drying the sludge obtained in step S3 to complete the treatment of the oily sludge. After treatment, the oil content of the sludge in this invention is less than 3‰, meeting environmental protection requirements; the water used in the process can be recycled, and the final dried sludge can be used for landscaping or road construction, achieving both oil content treatment compliance and resource utilization of oil, water, and mud.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oily sludge treatment, and particularly relates to a physical-chemical heat washing environment-friendly process for oily sludge. BACKGROUND

[0002] Oily sludge refers to sludge mixed with crude oil, oil residue, various finished oil and other heavy oil. Oily sludge does not exist in nature. Oily sludge is a mixture of oil, water, soil and even other pollutants formed by mixing water, soil and other substances in the process of oil development, refining, processing, transportation and production. In particular, oilfield oily sludge has been listed as a dangerous solid waste (HW08) by the state and is managed as a hazardous waste.

[0003] In the case of large oil production, if not properly treated, it will pollute the surrounding environment. Harmless and resourceful treatment of oily sludge is a difficult problem that needs to be solved and is also a requirement for sustainable development. Therefore, economic and effective treatment and utilization of oily sludge after reduction have important practical significance for the sustainable development of the oil and petrochemical industry. Due to the large volume of oily sludge, oily sludge must be treated for sludge reduction before final disposal. On the one hand, it reduces the water content of the sludge and reduces the volume of harmless treatment. On the other hand, it can recover part of the crude oil, thereby meeting the resource requirements. The current oily sludge treatment standards are two: Heilongjiang Provincial Standard "Oilfield Oily Sludge Comprehensive Utilization Pollution Control Standard" DB23 / T 1413-2010 and National Standard "Control of Pollutants in Agricultural Sludge" GB4284-1984. However, the oil content in the sludge treated by these standards is less than 2%, which does not meet the current clean production requirements.

[0004] The water content of oilfield oily sludge is generally 70% to 99%, and the oil and salt content is high. The composition of the oily sludge can be roughly divided into water, emulsified oil or adsorbed oil, solid foreign matter, inorganic salt and the like. Before harmless treatment, the oily sludge needs to be treated for reduction, so as to reduce the volume of the oily sludge. That is to say, after the treatment of the oily sludge, the oil content must be less than 3 ‰, and the remaining indicators must also meet the index requirements of GB4284-1984. With the increasing demand for oil resources worldwide, the production of oily sludge is also increasing, and people's awareness of environmental protection and sustainable development is also increasing. How to control the pollution of oily sludge to the environment has become an important problem for the petrochemical industry. At present, the treatment and disposal technology of oily sludge is developing rapidly. Various oily sludge treatment methods such as conditioning-separation-settling, solvent extraction, pyrolysis and incineration have been applied to oil and gas fields and refinery enterprises in China. However, conditioning-separation-settling can only be used as a pretreatment method for oily sludge; the cost of solvent extraction is high, and the equipment investment is too large; and the incineration method needs complex flue gas purification measures, which increases the treatment cost. Under the strong promotion of environmental protection, the oil and gas field exploitation industry has increased the progress of oily sludge treatment. Due to the large amount of historical oily sludge and the complexity of the composition, the treatment capacity of oily sludge in the short term cannot meet the demand for oily sludge treatment.

[0005] Therefore, how to provide an oil removal and degreasing process capable of rapidly reducing the oil content of oily sludge has become a problem to be solved by those skilled in the art. SUMMARY

[0006] Therefore, the present application provides a physical and chemical hot washing environment-friendly process for oily sludge. The purpose is to solve the technical problems of high cost, poor effect and inability to resource utilization of the existing oily sludge treatment technology.

[0007] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0008] The present application provides a physical and chemical hot washing environment-friendly process for oily sludge, comprising the following steps:

[0009] S1, mixing the oily sludge and the liquid medicine, and then sequentially performing rough washing and fine washing to obtain sludge oil and slurry;

[0010] S2, rinsing the slurry obtained in step S1 twice to obtain sludge oil and slurry;

[0011] S3, standing and separating the slurry obtained in step S2 to obtain water and sludge;

[0012] S4, sequentially performing filter pressing and drying on the sludge obtained in step S3 to complete the treatment of the oily sludge.

[0013] Further, the mass ratio of the oily sludge and the liquid medicine in the step S1 is 1:8-9; the temperature of the rough washing and the fine washing is independently 70-90℃, the time of the rough washing is 20-40min, and the time of the fine washing is 15-20min.

[0014] Further, the liquid medicine comprises a medicine and water, and the mass fraction of the medicine is 5-7%; the medicine comprises a main agent T13W01, an auxiliary agent T13W02 and an auxiliary agent T13W03.

[0015] The main agent T13W01 comprises raw materials with the following mass fractions: sodium metasilicate pentahydrate 0.5-4.5%, potassium hydroxide 0.01-0.03%, glycerol 1-3%, organic amine fat 5-8%, heavy sodium carbonate 1-3%, fatty alcohol polyether 0.5-3%, non-ionic surfactant 1-3%, and the rest is water;

[0016] The auxiliary agent T13W02 comprises raw materials with the following mass fractions: potassium hydroxide 0.1-0.4%, low-foaming surfactant 1-3%, heavy oil soaking degreasing surfactant 1-2.5%, ethylene glycol butyl ether 2-8%, oil and wax removing surfactant 1-3%, and the rest is water;

[0017] The auxiliary agent T13W03 comprises raw materials with the following mass fractions: potassium hydroxide 0.1-0.5%, carbon removing surfactant 1-4%, penetrating agent 0.5-1.5%, low-temperature surfactant 1-3%, defoaming agent 0.01-0.03%, surfactant 1-3%, and the rest is water.

[0018] Further, in the step S2, a flocculating agent is added in the second rinsing, and the mass ratio of the sludge water and the flocculating agent is 100:1-2; the time of the two rinsings is independently 10-20min.

[0019] Further, the flocculating agent is polyaluminum chloride.

[0020] Further, in the step S3, the time of the static separation is 30-60min.

[0021] Further, in the step S4, the drying is natural drying or baking; the time of the natural drying is ≥4h; the temperature of the baking is 80-100℃, and the time of the baking is ≥1h.

[0022] Further, the oily sludge obtained in the steps S1 and S2 is discharged into an oily sludge recovery pool for recovery, and the water obtained in the step S3 is used as a component of the liquid medicine.

[0023] Further, the sludge after the drying in the step S4 and without the destruction of the organic matters is used for greening or road repairing.

[0024] Via the technical solution, compared with the prior art, the present application has the following advantages:

[0025] 1. Compared with the prior art, the present application does not require high-temperature heating treatment, and saves a large amount of cost while avoiding the generation of a large amount of VOCs.

[0026] 2. After the method of the present application is used to treat oil-containing sludge, the oil content of the sludge is less than 3‰, meeting the environmental protection index requirements; and the water used in the process can be recycled, and the dry sludge obtained can be used for greening or road repair, not only meeting the oil content treatment standard, but also separating oil, water and sludge, and realizing resource utilization. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A process flow diagram for treating oil-containing sludge is provided. DETAILED DESCRIPTION

[0028] The present application provides a physical and chemical heat washing environmental protection process for oil-containing sludge, comprising the following steps:

[0029] S1. Mixing oil-containing sludge and liquid medicine and then sequentially performing rough washing and fine washing to obtain sludge oil and sludge water;

[0030] S2. Twice rinsing the sludge water obtained in step S1 to obtain sludge oil and sludge;

[0031] S3. Static separation of the sludge obtained in step S2 to obtain water and sludge;

[0032] S4. Sequentially performing pressure filtration and drying of the sludge obtained in step S3 to complete the treatment of oil-containing sludge.

[0033] In the present application, in step S1, the mass ratio of oil-containing sludge to liquid medicine is 1:8-9, preferably 1:8.5; the temperature of rough washing and fine washing is independently 70-90℃, preferably 75-85℃, and further preferably 80℃; the time of rough washing is 20-40min, preferably 25-35min, and further preferably 30min; the time of fine washing is 15-20min, preferably 16-18min, and further preferably 17min.

[0034] In the present application, in step S1, rough washing and fine washing are both performed by stirring, and a gas float device is needed to provide compressed air.

[0035] In the present application, the liquid medicine comprises a medicament and water, and the mass fraction of the medicament is 5-7%, preferably 6%; the medicament comprises main agent T13W01, auxiliary agent T13W02 and auxiliary agent T13W03.

[0036] The main agent T13W01 comprises the following mass fraction of raw materials: sodium metasilicate pentahydrate 0.5-4.5%, potassium hydroxide 0.01-0.03%, glycerol 1-3%, organic amine fat 5-8%, heavy sodium carbonate 1-3%, fatty alcohol polyether 0.5-3%, non-ionic surfactant 1-3%, and the balance is water;

[0037] The auxiliary agent T13W02 comprises the following mass fraction of raw materials: potassium hydroxide 0.1-0.4%, low-foaming surfactant 1-3%, heavy oil soaking degreasing surfactant 1-2.5%, ethylene glycol butyl ether 2-8%, oil and wax removing surfactant 1-3%, and the balance is water;

[0038] The auxiliary agent T13W03 comprises the following mass fraction of raw materials: potassium hydroxide 0.1-0.5%, carbon removing surfactant 1-4%, penetrant 0.5-1.5%, low-temperature surfactant 1-3%, defoaming agent 0.01-0.03%, surfactant 1-3%, and the balance is water.

[0039] In the present application, when the oily sludge contains paraffin wax, the oil removing degreasing agent comprises the main agent T13W01, the auxiliary agent T13W02 and the auxiliary agent T13W03; the mass ratio of the main agent T13W01, the auxiliary agent T13W02 and the auxiliary agent T13W03 is 4-6:1.5-2.5:0.5-1.5, preferably 4.5-5.5:1.8-2.2:0.8-1.2, and further preferably 5:2:1;

[0040] When the oily sludge does not contain paraffin wax, the oil removing degreasing agent comprises the main agent T13W01 and the auxiliary agent T13W02; the mass ratio of the main agent T13W01 and the auxiliary agent T13W02 is 4-6:1.5-2.5, preferably 4.5-5.5:1.8-2.2, and further preferably 5:2.

[0041] In the main agent T13W01, the organic amine ester is organic amine ester TPP; the fatty alcohol polyether is fatty alcohol polyoxyethylene ether.

[0042] In the auxiliary agent T13W03, the penetrant is JFC-1 penetrant, the low-temperature surfactant is FSD305 low-temperature surfactant, and the surfactant is FSD270D surfactant.

[0043] In the present application, in the step S2, the flocculating agent is added in the second rinsing, and the mass ratio of the sludge water and the flocculating agent is 100:1-2, preferably 100:1.5; the time of the two rinsing operations is independently 10-20 min, preferably 12-18 min, and further preferably 14-16 min; the operation steps of the two rinsing operations are the same.

[0044] In the present application, the flocculating agent is polyaluminum chloride.

[0045] In the present application, the standing separation time in step S3 is 30-60 min, preferably 40-50 min, and further preferably 45 min.

[0046] In the present application, the drying in step S4 is natural drying or baking; the natural drying time is ≥4 h, preferably ≥5 h, and further preferably ≥6 h; the baking temperature is 80-100℃, preferably 85-95℃, and further preferably 90℃; and the baking time is ≥1 h, preferably ≥1.5 h, and further preferably ≥2 h.

[0047] In the present application, the dirty oil obtained in steps S1 and S2 is fed into a dirty oil recovery tank for recovery; and the water obtained in step S3 is used as a component of a chemical liquid.

[0048] In the present application, the sludge after drying in step S4 and without organic matter being destroyed is used for greening or road repair.

[0049] The technical solutions provided by the present application are described in detail below in conjunction with examples, but they should not be understood as limiting the scope of protection of the present application.

[0050] Preparation of the chemical agent: the chemical agent comprises main agent T13W01, auxiliary agent T13W02, and auxiliary agent T13W03.

[0051] The mass fraction of each raw material in main agent T13W01 is: sodium metasilicate pentahydrate 0.5%, potassium hydroxide 0.03%, glycerol 1%, organic amine ester TPP 5%, heavy sodium carbonate 1%, fatty alcohol polyoxyethylene ether 0.5%, non-ionic surfactant 1%, and the balance is water.

[0052] The mass fraction of each raw material in auxiliary agent T13W02 is: potassium hydroxide 0.1%, MD-218 low-foam surfactant 1%, heavy oil soaking degreasing surfactant 2.5%, ethylene glycol butyl ether 5%, oil and wax removing surfactant 3%, and the balance is water.

[0053] The mass fraction of each raw material in auxiliary agent T13W03 is: potassium hydroxide 0.1%, RQ-139 carbon removing surfactant 4%, JFC-1 penetrant 1.5%, FSD305 low-temperature surfactant 3%, defoaming agent 0.03%, FSD270D surfactant 3%, and the balance is water.

[0054] The preparation process of the main agent T13W01 is as follows: water is added into a reaction kettle, and a stirrer is started to set the rotation speed at 90 r / min; then sodium metasilicate pentahydrate, potassium hydroxide, glycerol, organic amine fat, heavy sodium carbonate, fatty alcohol polyether, and non-ionic surfactant are sequentially added into the reaction kettle; after each addition of a raw material, stirring is performed for 25 min, and after the addition of all the raw materials, stirring is performed for 40 min.

[0055] The preparation process of the auxiliary agent T13W02 is as follows: water is added into a reaction kettle, and a stirrer is started to set the rotation speed at 80 r / min; then potassium hydroxide, MD-218 low-foam surfactant, heavy oil soaking degreasing surfactant, ethylene glycol butyl ether, and oil and wax removing surfactant are sequentially added into the reaction kettle; after each addition of a raw material, stirring is performed for 25 min, and after the addition of all the raw materials, stirring is performed for 1.5 h.

[0056] The preparation process of the auxiliary agent T13W03 is as follows: water is added into a reaction kettle, and a stirrer is started to set the rotation speed at 80 r / min; then potassium hydroxide, RQ-139 carbon removing surfactant, JFC-1 penetrant, FSD305 low-temperature surfactant, defoaming agent, and FSD270D surfactant are sequentially added into the reaction kettle; after each addition of a raw material, stirring is performed for 18 min; and after the addition of all the raw materials, stirring is performed for 1.5 h.

[0057] Example 1

[0058] The oily sludge used in this example is the oily sludge of Daqing Oilfield (381 treatment station), and the process route is performed according to the process route. Figure 1

[0059] The main agent T13W01, the auxiliary agent T13W02, the auxiliary agent T13W03, and water are mixed to prepare a liquid medicine, in which the mass fraction of the main agent T13W01 is 5%, the mass fraction of the auxiliary agent T13W02 is 1%, and the mass fraction of the auxiliary agent T13W03 is 1%.

[0060] 16 tons of the liquid medicine are put into a crude washing section No. 1 pry, heated to 80℃, and then 2 tons of the oily sludge are added into the liquid medicine, stirred for 30 min by the stirrer in the crude washing pry, and compressed air is provided from the bottom of the crude washing section No. 1 pry at the same time. After the crude washing, the separated oil is collected in a waste oil recovery tank for reuse, and the separated water and mud are transferred into a fine washing section No. 1 pry.

[0061] When the fine washing section No. 1 pry contains 2 tons of water and mud, 16 tons of the liquid medicine are put into the fine washing section No. 1 pry, heated to 80℃, and stirred for 15 min by the stirrer in the fine washing pry, and compressed air is provided from the bottom of the fine washing section No. 1 pry at the same time. After the fine washing, the separated oil is collected in a waste oil recovery tank for reuse, and the separated water and mud are transferred into a rinsing section No. 1 pry. ​

[0062] Fill the No. 1 rinsing section with clean water and stir for 12 minutes at room temperature using the agitator inside the rinsing section. While stirring, compressed air is supplied from the bottom of the No. 1 rinsing section. After rinsing in the No. 1 rinsing section, the separated sludge and oil will be collected and reused in the sludge and oil recovery tank. The separated water and mud will be transferred to the No. 2 rinsing section and flocculant polyaluminum chloride will be added. The flocculant content will be 1.5% of the total weight of mud and water. Repeat the steps in the No. 1 rinsing section. After the No. 2 rinsing section, the separated sludge and oil will be collected and reused in the sludge and oil recovery tank. The separated mud will be transferred to the sewage settling section for static separation for 50 minutes. Then, the water will be recycled to the coarse washing section and fine washing section through a plate and frame filter press for chemical preparation to achieve water recycling. The dried mud after filter pressing will be naturally dried for 4 hours before being used for landscaping or road repair.

[0063] The No. 2 skid of the coarse washing section, the No. 2 skid of the fine washing section, the No. 2 skid of the rinsing section, and the No. 2 settling section are parallel to the No. 1 skid of the coarse washing section, the No. 1 skid of the fine washing section, the No. 1 skid of the rinsing section, and the No. 1 settling section, respectively, and the oily sludge is treated simultaneously in the same way.

[0064] Example 2

[0065] The oily sludge used in this embodiment is raw oily sludge from Daqing Oilfield (381 Treatment Station), according to... Figure 1 The process route is followed.

[0066] Prepare a drug solution by mixing the main agent T13W01, the auxiliary agent T13W02, the auxiliary agent T13W03 and water. In the drug solution, the mass fraction of the main agent T13W01 is 5%, the mass fraction of the auxiliary agent T13W02 is 1%, and the mass fraction of the auxiliary agent T13W03 is 1%.

[0067] Sixteen tons of chemical solution were placed into the No. 1 skid of the coarse washing section and heated to 70°C. Then, two tons of oily sludge were added to the chemical solution and stirred for 40 minutes using the agitator inside the coarse washing skid. Compressed air was supplied from the bottom of the No. 1 skid of the coarse washing section during the stirring process. After the coarse washing was completed, the separated sludge was collected and reused in the sludge recovery tank, while the separated water and sludge were transferred to the No. 1 skid of the fine washing section.

[0068] When the No. 1 skid of the fine washing section contains 2 tons of water and mud, 16 tons of chemical solution are put into the No. 1 skid of the fine washing section, heated to 70°C, and stirred for 20 minutes with the stirrer inside the fine washing skid. At the same time, compressed air is provided from the bottom of the No. 1 skid of the fine washing section. After the fine washing is completed, the separated sludge enters the sludge recovery tank for collection and reuse, and the separated water and mud are transferred to the No. 1 skid of the rinsing section.

[0069] The rinsing segment 1 pry is filled with clean water, and the stirring device in the rinsing pry is stirred for 15 min at room temperature. Compressed air is provided from the bottom of the rinsing segment 1 pry while stirring. The separated waste oil is collected in the waste oil recovery tank for recycling after the rinsing of the 1st pry. The separated water and mud are transferred to the rinsing segment 2, and the flocculant polyaluminum chloride is added. The flocculant accounts for 1.5% of the total weight of the mud and water. The steps in the rinsing segment 1 pry are repeated. The separated waste oil is collected in the waste oil recovery tank for recycling after the rinsing of the 2nd segment. The separated mud is transferred to the sewage settling segment for standing separation for 45 min. The water is recovered to the rough washing segment and the fine washing segment for preparation of the liquid medicine to realize water recycling. The dry mud after pressure filtration is naturally dried for 5 h and used for greening or road repair.

[0070] The 2nd segment of the rough washing, the 2nd segment of the fine washing, the 2nd segment of the rinsing and the 2nd segment of the settling are respectively parallel to the 1st segment of the rough washing, the 1st segment of the fine washing, the 1st segment of the rinsing and the 1st segment of the settling. The oil-containing sludge is treated according to the same method at the same time.

[0071] Example 3

[0072] The oil-containing sludge used in this example is the oil-containing sludge of Daqing Oilfield (381 treatment station). The process route is carried out according to the process route. Figure 1

[0073] The main agent T13W01, the auxiliary agent T13W02, the auxiliary agent T13W03 and water are mixed to prepare a liquid medicine. In the liquid medicine, the mass fraction of the main agent T13W01 is 5%, the mass fraction of the auxiliary agent T13W02 is 1%, and the mass fraction of the auxiliary agent T13W03 is 2%.

[0074] 16 tons of liquid medicine are put into the 1st segment of the rough washing, and heated to 75℃. Then 2 tons of oil-containing sludge are added to the liquid medicine, and stirred for 35 min by the stirring device in the rough washing pry. Compressed air is provided from the bottom of the 1st segment of the rough washing pry while stirring. The separated waste oil is collected in the waste oil recovery tank for recycling after the rough washing. The separated water and mud are transferred to the 1st segment of the fine washing.

[0075] When the 1st segment of the fine washing contains 2 tons of water and mud, 16 tons of liquid medicine are put into the 1st segment of the fine washing, and heated to 80℃. The stirring device in the fine washing pry is stirred for 18 min. Compressed air is provided from the bottom of the 1st segment of the fine washing pry while stirring. The separated waste oil is collected in the waste oil recovery tank for recycling after the fine washing. The separated water and mud are transferred to the 1st segment of the rinsing.

[0076] ​The rinsing segment 1 prying is filled with clean water, and the prying is stirred for 20 minutes at normal temperature by using the stirrer in the prying, and compressed air is provided from the bottom of the prying at the same time, the separated oil is collected in the oil recovery tank for recycling, and the separated water and mud are transferred to the rinsing segment 2, and the flocculant polyaluminum chloride is added, the flocculant is 1.5% of the total weight of the mud and water, and the steps in the rinsing segment 1 prying are repeated; the separated oil in the rinsing segment 2 is collected in the oil recovery tank for recycling, and the separated mud is transferred to the sewage settling segment for standing separation for 40 minutes, then the water is recovered to the rough washing segment and the fine washing segment for preparation of the liquid medicine to realize water recycling, and the dry mud after pressure filtration is dried at 80℃ for 1 hour and used for greening or road repair.

[0077] The rough washing segment 2 prying, the fine washing segment 2 prying, the rinsing segment 2 prying and the settling segment 2 are respectively parallel to the rough washing segment 1 prying, the fine washing segment 1 prying, the rinsing segment 1 prying and the settling segment 1, and the oil-containing sludge is treated by using the same method at the same time.

[0078] The initial mineral oil content and the treated mineral oil content of the sludge are detected by using the ultraviolet-visible spectrophotometer (T6 new century) YNX-SY-037 according to the sludge detection method of the urban sewage treatment plant, and the ultraviolet-visible spectrophotometry method CJ / T221-2005, and the detection results are shown in Table 1.

[0079] Table 1: Mineral oil content detection results

[0080] Example 1 Example 2 Example 3 Mineral oil initial content 100 g / kg 102 g / kg 103 g / kg Mineral oil final content 0.4 g / kg 0.6 g / kg 0.8 g / kg

[0081] As shown in Table 1, after the oil-containing sludge is treated by the method of the present application, the oil content of the sludge is between 0.4 and 0.8‰, which is lower than 3‰, and meets the environmental protection index requirements.

[0082] The above description is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A physical-chemical thermal washing process of oily sludge, characterized in that, The method comprises the following steps: S1, mixing oily sludge and liquid medicine, and then sequentially performing rough washing and fine washing to obtain dirty oil and slurry water; S2, performing twice rinsing on the slurry water obtained in step S1 to obtain dirty oil and sludge; S3, performing standing separation on the sludge obtained in step S2 to obtain water and sludge; S4, sequentially performing filter pressing and drying on the sludge obtained in step S3 to complete the treatment of the oily sludge; The liquid medicine comprises a medicament and water, and the mass fraction of the medicament is 5-7%; the medicament comprises main agent T13W01, auxiliary agent T13W02 and auxiliary agent T13W03; The main agent T13W01 comprises the following raw materials in the following mass fractions: sodium metasilicate pentahydrate 0.5-4.5%, potassium hydroxide 0.01-0.03%, glycerol 1-3%, organic amine fat 5-8%, heavy sodium carbonate 1-3%, fatty alcohol polyether 0.5-3%, non-ionic surfactant 1-3%, and the balance is water; The auxiliary agent T13W02 comprises the following raw materials in the following mass fractions: potassium hydroxide 0.1-0.4%, low-foaming surfactant 1-3%, heavy oil soaking degreasing surfactant 1-2.5%, ethylene glycol butyl ether 2-8%, oil and wax removing surfactant 1-3%, and the balance is water; The auxiliary agent T13W03 comprises the following raw materials in the following mass fractions: potassium hydroxide 0.1-0.5%, carbon removing surfactant 1-4%, penetrating agent 0.5-1.5%, low-temperature surfactant 1-3%, defoaming agent 0.01-0.03%, surfactant 1-3%, and the balance is water; In step S2, a flocculating agent is added during the second rinsing, and the mass ratio of the slurry water to the flocculating agent is 100:1-2; the time of the two rinsings is independently 10-20 min; The flocculating agent is polyaluminum chloride.

2. The physico-chemical thermal washing of oil sludge process according to claim 1, characterized in that, In step S1, the mass ratio of the oily sludge to the liquid medicine is 1:8-9; the temperature of the rough washing and the fine washing is independently 70-90 DEG C, the time of the rough washing is 20-40 min, and the time of the fine washing is 15-20 min.

3. The physico-chemical thermal washing of oil sludge process according to claim 2, characterized in that, In step S3, the time of the standing separation is 30-60 min.

4. The physico-chemical thermal washing of oil sludge environment-friendly process according to claim 3, characterized in that, In step S4, the drying is natural drying or drying by heating; the time of the natural drying is greater than or equal to 4 h; the temperature of the drying by heating is 80-100 DEG C, and the time of the drying by heating is greater than or equal to 1 h.

5. The physico-chemical thermal washing of oil sludge in an environmentally friendly process according to claim 2, 3 or 4, characterized in that, The dirty oil obtained in steps S1 and S2 is fed into a dirty oil recovery tank for recovery; and the water obtained in step S3 is used as a component of the liquid medicine.

6. The physico-chemical thermal washing of oil sludge environment friendly process as claimed in claim 5 wherein, The sludge obtained after the drying in step S4 and without damage to the organic matter is used for greening or road repairing.

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