CN111362539A - Reduction treatment method for oily sludge - Google Patents
Reduction treatment method for oily sludge Download PDFInfo
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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
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F11/06—Treatment of sludge; Devices therefor by oxidation
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- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
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- 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
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
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- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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Abstract
The invention belongs to the technical field of industrial treatment of oily sludge, and particularly relates to a reduction treatment method of oily sludge, which comprises the following steps: s1, modifying, namely adding compound alkali at normal temperature to adjust the pH value of the oily sludge, wherein the compound alkali comprises a calcium-containing substance and an alkaline substance; s2, oxidizing, adding an oxidizing agent, and stirring for reaction under the condition of introducing ozone; s3, flocculating, adding a flocculating agent, and stirring for reaction; s4, dehydrating, and separating by adopting a filter pressing dehydration mode to obtain a mud cake and a liquid mixture; s5, oil-water separation, wherein the liquid mixture is subjected to oil-water separation to obtain recovered crude oil and treated water; the whole treatment is carried out at normal temperature, the addition amount of chemical substances is small, the treatment condition is simple, and the volume of the oily sludge is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of industrial treatment of oily sludge, and particularly relates to a reduction treatment method of oily sludge.
Background
The oily sludge refers to sludge mixed with crude oil, various finished oils, residual oil and other heavy oils. The oily sludge is not inherent in nature, but is generated by various industries related to crude oil and product oil, such as oil field exploitation, petroleum refining process, transportation, use, storage and the like, and common types comprise oil refining sludge, coal chemical industry sludge, urban oily sludge and the like.
The existing oil-containing sludge treatment technology of the oil field can adopt methods such as high-temperature hot washing, centrifugal screw stacking machine treatment and the like, the water content of a treated mud cake is generally over 75 percent, and treatment equipment generally has the characteristics of large volume, high energy consumption and the like; can also be treated directly by burning, but can cause substances such as dioxin and the like to pollute the air; the treatment can also be carried out by adopting a chemical treatment mode, and the defects of large dosage, complex dosing process and the like exist.
Disclosure of Invention
In order to solve the problems, the invention provides a reduction treatment method of oily sludge, which is carried out at normal temperature, has small addition amount of chemical substances and simple treatment conditions, and the water content of the sludge cake obtained after treatment is 30-45%, so that the volume of the oily sludge is greatly reduced.
The invention is realized by adopting the following technical scheme:
a reduction treatment method for oily sludge comprises the following steps:
s1, modifying, namely adding 0.1-1 kg/m of modified starch at normal temperature3The pH value of the oily sludge is adjusted to 9-11, and the composite alkali comprises a calcium-containing substance and an alkaline substance;
s2, oxidizing, adding an oxidant, and stirring and reacting for 5-15 min under the condition of introducing ozone;
s3, flocculating, adding a flocculating agent, and stirring for reacting for 1-3 min;
s4, dehydrating, namely separating the oily sludge treated in the step S3 in a filter pressing dehydration mode to obtain a mud cake and a liquid mixture;
and S5, oil-water separation, wherein the liquid mixture is subjected to oil-water separation to obtain recovered crude oil and treated water.
Preferably, in step S1, the calcium-containing material is quicklime, and the alkaline material is sodium hydroxide or potassium hydroxide. In the modification stage of step S1, the pH value of the oily sludge is adjusted to 9-11, and the method has the following advantages: 1. the crude oil in the sludge is promoted to be desorbed; 2. precipitating part of ions in the oily sludge into solid; 3. a strong alkaline environment is provided for the oxidation process of the subsequent step S2, the oxidation speed is accelerated, and the comprehensive production efficiency of oily sludge treatment is effectively improved; 3. the quicklime has the function of decoloring and can promote the desorption of oil substances.
Preferably, in step S2, the oxidizing agent is sodium percarbonate, and the addition amount of the sodium percarbonate is 0.5 to 2kg/m3. The oxidation stage of step S2, which is carried out under the combined action of ozone and sodium percarbonate, has the following advantages: 1. HO produced by sodium percarbonate2-Can catalyze the decomposition of ozone, although the reaction rate is slow, because of HO2-In the presence of the ozone, the decomposition rate of the ozone is improved along with the increase of the pH value, and the strong alkaline environment provided by the step S1 generates a synergistic effect with the ozone and the sodium percarbonate, so that the comprehensive production rate of the oily sludge treatment is effectively improved; 2. active intermediates such as-OH free radicals and the like decomposed by ozone break chains of macromolecular substances in the oily sludge into micromolecules, promote oily substances such as colloid and the like to be decomposed into carbon dioxide and water, are beneficial to the dehydration stage of the subsequent step S4, and filter cloth of dehydration equipment is not blocked during filter pressing dehydration under the high pressure condition, so that oil and water can pass through the filter cloth conveniently, and the treatment rate of the oily sludge is improved; 3. the added sodium percarbonate can react with the quicklime added in the step S1 to generate precipitates such as calcium carbonate and the like, the calcium carbonate and the precipitates generated in the step S1 can play a role of a bracket in the mud cake formed by the dehydration in the step S4, so that complex and fine throats are formed in the mud cake, and under the condition of high-pressure extrusion, the complex and fine throats can block granular emulsified oil in the oily sludge, so that the granular emulsified oil is broken, the subsequent oil-water separation efficiency and effect are improved, oil and water in the oily sludge can smoothly penetrate through the formed mud cake, and the formed mud cake is effectively improvedComprehensive efficiency of treating oil-containing sludge.
Preferably, in step S2, the ozone is introduced at a concentration of 5-20 g/min. In the actual process of treating the oily sludge, the oily sludge modified in step S1 is oxidized by using sodium percarbonate and ozone at the same time, and the ozone introduction concentration is particularly selected in order to make full use of sodium percarbonate and ozone and prevent ozone from escaping into the atmosphere and damaging the environment.
Preferably, in step S3, the addition amount of the flocculant is 2.5-10 g/m3The flocculating agent is preferably one or more of polymeric ferric sulfate, polymeric aluminum chloride and polymeric aluminum ferric sulfate.
Preferably, in step S3, 0.05-0.5 g/m is further added3Preferably, the coagulant aid is polyacrylamide.
Preferably, in step S4, a plate-and-frame filter press is used for the filter pressing and dewatering, and the working pressure of the plate-and-frame filter press is preferably 0.8 to 1.6 MPa.
Preferably, the oily sludge to be treated may be subjected to a pretreatment operation, for example, a pretreatment operation by adding an appropriate amount of water, such that the oily sludge treated in step S1 has a water content of 83% to 98% and a crude oil content of 1% to 13%; by the pretreatment, the water content of the oily sludge is set to 80% or more, the treatment effect of each process stage of the oil-containing reduction treatment method of the present invention can be promoted, the treatment time of steps S1 to S5 can be shortened, and the treatment efficiency can be improved.
Through tests, in the step S4, the water content of the mud cake is 30-45%, in the step S5, the water content of the recovered crude oil is less than or equal to 5ml/L, and the mechanical impurities are less than or equal to 5 mg/L; the oil content in the treated water is less than or equal to 50mg/L, and the suspended matter is less than or equal to 50 mg/L. Due to the adoption of the oil-containing reduction treatment method, the obtained mud cake, the recovered crude oil and the treated water can reach good continuous treatment or use indexes, for example, the treated water can be used as water for pretreating the oil-containing sludge before the step S1, and the waste of pure water resources is avoided.
Preferably, the following operations may be performed to further reduce and detoxify the cake obtained in step S4:
s6, dispersing, namely, scattering the mud cakes to obtain granules with the particle size of less than 15 mm;
s7, vaporizing, and vaporizing the granular material for 30-50 min under the stirring condition of 105-120 ℃ in the nitrogen atmosphere to obtain a vaporized material;
s8, pyrolyzing, namely pyrolyzing the vaporized material for 40-60 min under the stirring condition of 450-500 ℃ in the nitrogen atmosphere to obtain a pyrolyzed material, wherein in the step, even if the pyrolysis treatment time is prolonged properly, the oil content in the pyrolyzed material is difficult to be reduced to be below 0.1%, for example, the pyrolysis treatment time is increased to 90min, and the oil content in the pyrolyzed material is 0.18%;
therefore, for further processing of the pyrolysis material, the following operations may also be performed:
s9, performing harmlessness, mixing 1 part of pyrolysis material and 0.25-2 parts of decomposition promoting material by weight to obtain a dry material, performing drying treatment for 20-30 min under the stirring condition of 500-550 ℃, and separating to obtain dry mud, wherein the oil content of the dry mud is less than or equal to 0.03%; the material accelerating material comprises pyrolysis accelerating material, the particle size of the pyrolysis accelerating material is 0.5-4 mm, and the pyrolysis accelerating material is stainless steel metal balls.
Preferably, in step S9, the decomposition promoting material is composed of, by weight, 0.25 to 2 parts of a pyrolysis promoting material and 0 to 0.5 part of a quartz material, the pyrolysis promoting material is a particulate matter with a particle size of 0.5 to 4mm, the pyrolysis promoting material is made of an inorganic matter with a melting point higher than 600 ℃, and the quartz material is at least one of river sand or sea sand.
Because the drying material contains the decomposition promoting material with larger contact area, discontinuous pores are formed among the decomposition promoting materials, when the drying material is heated, the decomposition promoting material with higher surface temperature can collide with the pyrolysis material and have heat exchange effect, oil substances in the pyrolysis material are further decomposed, the decomposition effect of organic matters is ensured to be more thorough, the supply of heat energy is saved, the heat energy loss is reduced, and the utilization rate of energy is improved.
The invention has the beneficial effects that:
1. the method for reducing the oily sludge is carried out at normal temperature, the addition amount of chemical substances is small, the treatment condition is simple, the water content of the sludge cake obtained after treatment is 30-45%, the volume of the oily sludge is greatly reduced, the reduction effect is obvious, the requirement for rapid treatment can be met, and the method is suitable for industrial production.
2. According to the method for reducing the oily sludge, various substances added in the modification, oxidation and flocculation stages generate a synergistic effect mutually, so that the oil substances in the oily sludge can be promoted to be demulsified and desorbed, solid impurities are intercepted during dehydration, and the mechanical impurity content in the generated recovered crude oil is less than 5mg/L after the oil substances are further treated, so that the level of direct outward transportation is achieved.
3. According to the method for reducing the oil-containing sludge, the obtained liquid mixture can be separated from the recovered crude oil and the treated water only through simple gravity settling after modification, oxidation, flocculation and dehydration, and the parameter index of the treated water meets the B1 requirement of the oilfield reinjection water index.
4. According to the method for reducing the oily sludge, the oily sludge can be subjected to harmless treatment through vaporization, pyrolysis and drying steps, when the drying treatment is carried out, the drying material contains the decomposition promoting materials with large contact area, discontinuous pores are formed among the decomposition promoting materials, when the drying material is subjected to heating treatment, the decomposition promoting materials with high surface temperature can collide with the pyrolysis material and have a heat exchange effect, further decomposition of oil substances in the pyrolysis material is facilitated, the decomposition effect of organic matters is ensured to be more thorough, heat energy is saved, heat energy loss is reduced, and the utilization rate of energy is improved.
Detailed Description
The technical solutions in the examples are clearly and completely described below. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Taking the sludge at the bottom of the tank in the standard treatment station of 10 stations in total in five oil production plants in Changqing oil field and the hong Kong oil field Hongkong united station as an example, because the oil-containing sludge is from different sources, such as the oil-containing sludge from a drying tank, the oil-containing sludge from an oil storage tank or a settling tank, the sludge from a well site sludge tank, a slurry tank, the sludge required to be treated in emergency rescue, and the like, the specific oil content and water content of each oil-containing sludge are generally different, and the specific component content of the oil-containing sludge at the upper layer and the lower layer of each settling tank is also different, so that the oil-containing sludge can be diluted before the reduction treatment for the convenience of treatment.
Example 1
In this embodiment, for example, oily sludge at a standard treatment station of a hong Kong oil field Hongkong united station and at the bottom of an oil storage tank is treated, the oily sludge is pretreated by adding a proper amount of water, and the water content of the pretreated oily sludge is about 83% and the crude oil content is about 6%.
Transferring the pretreated oily sludge into a reaction tank by a lift pump to reach the height of 1m3For example, the reduction processing is performed as follows:
s1, modifying, namely adding 0.75kg of quicklime and 0.25kg of sodium hydroxide at normal temperature, adjusting the pH value of the oily sludge to 11, and carrying out the next operation after reacting for 5 min;
s2, oxidizing, adding 1.5kg of sodium percarbonate, and stirring and reacting for 10min under the condition of introducing ozone, wherein the ozone introducing speed is 20 g/min;
s3, flocculating, adding 6g of polymeric ferric sulfate and 0.5g of polyacrylamide, and stirring to react for 3min, wherein the coagulant aid is an aqueous solution in the embodiment;
s4, dehydrating, namely separating the oily sludge treated in the step S3 by adopting a plate-and-frame filter-press dehydrator under the condition of 1.8MPa to obtain a mud cake and a liquid mixture, wherein the water content of the mud cake is 31.5%;
s5, performing oil-water separation, and separating by using an oil-water separator to obtain recovered crude oil and treated water, wherein the water content of the recovered crude oil is less than or equal to 5g/kg, and the mechanical impurities are less than or equal to 5 g/kg; the oil content of the treated water is less than or equal to 50mg/L, and the suspended matter is less than or equal to 50 mg/L.
Preferably, in order to further reduce the mud cake obtained in step S4, taking 1t mud cake with water content of 31.5% as an example, the oil content of the mud cake is about 17.5%, that is, the water content of the mud cake is about 315kg, the soil content is about 510kg, and the oil content is about 175kg, the following operations can be further performed:
s6, dispersing, namely, scattering the mud cakes to obtain granules with the particle size of less than 10 mm;
s7, vaporizing, and vaporizing the granular material for 50min under the stirring condition of 105 ℃ in the nitrogen atmosphere to obtain a vaporized material;
s8, pyrolyzing, namely pyrolyzing the vaporized material for 50min under the stirring condition of 450-470 ℃ in the nitrogen atmosphere to obtain a pyrolyzed material, wherein the oil content of the pyrolyzed material is less than or equal to 0.3%, and the water content of the pyrolyzed material is less than or equal to 0.01%, and in the step, even if the appropriate pyrolysis treatment time is prolonged, the oil content of the pyrolyzed material is difficult to be reduced to be less than 0.1%, for example, the pyrolysis treatment time is increased to 90min, and the oil content of the pyrolyzed material is 0.18%;
s9, performing innocent treatment, namely mixing the pyrolysis material with 150kg of decomposition promoting material to obtain a dry material, performing drying treatment for 30min under the stirring condition of 530-550 ℃, and separating to obtain dry mud and decomposition promoting reclaimed materials, wherein the oil content of the dry mud is less than or equal to 0.03%; the material accelerating material comprises pyrolysis accelerating material, the particle size of the pyrolysis accelerating material is 0.5-4 mm, and the pyrolysis accelerating material is stainless steel metal balls.
Example 2
In this embodiment, taking the oily sludge of a drying tank of a standard processing station of a hong Kong oil field Hongkong united station as an example, the water content of the oily sludge is about 78%, and the crude oil content is about 13%.
Transferring the oily sludge into a reaction tank by a lift pump to reach the volume of 1m3For example, the reduction processing is performed as follows:
s1, modifying, namely adding 0.06kg of lime and 0.04kg of sodium hydroxide at normal temperature, and adjusting the pH value of the oily sludge to 9;
s2, oxidizing, adding 2kg of sodium percarbonate, and stirring and reacting for 15min under the condition of introducing ozone, wherein the ozone introducing speed is 10 g/min;
s3, flocculating, adding 10g of polyaluminum chloride, and stirring to react for 3 min;
s4, dehydrating, namely, performing pressure filtration and separation on the oily sludge treated in the step S3 under the condition of 1.6MPa by using a plate-and-frame type pressure filtration dehydrator to obtain a mud cake and a liquid mixture, wherein the water content of the mud cake is 38%;
s5, performing oil-water separation, and separating by using an oil-water separator to obtain recovered crude oil and treated water, wherein the water content of the recovered crude oil is less than or equal to 5g/kg, and the mechanical impurities are less than or equal to 5 g/kg; the oil content of the treated water is less than or equal to 50mg/L, and the suspended matter is less than or equal to 50 mg/L.
Preferably, in order to further reduce the mud cake obtained in step S4, taking 1t of mud cake with water content of 38% as an example, the oil content of the mud cake is about 18.5%, that is, the water content of the mud cake is about 380kg, the soil content is about 435kg, and the oil content is about 185kg, the following operations can be performed:
s6, dispersing, namely, scattering the mud cakes to obtain granules with the particle size of less than 10 mm;
s7, vaporizing, and vaporizing the granular material for 40min under the stirring condition of 120 ℃ in the nitrogen atmosphere to obtain a vaporized material;
s8, pyrolyzing, namely pyrolyzing the vaporized material for 60min under the stirring condition of 480-500 ℃ in the nitrogen atmosphere to obtain a pyrolyzed material, wherein the oil content of the pyrolyzed material is less than or equal to 0.3%, and the water content of the pyrolyzed material is less than or equal to 0.01%, and in the step, even if the appropriate pyrolysis treatment time is prolonged, the oil content of the pyrolyzed material is difficult to be reduced to be less than 0.1%, for example, the pyrolysis treatment time is increased to 90min, and the oil content of the pyrolyzed material is about 0.14%;
s9, performing innocent treatment, namely mixing the pyrolysis material with 850kg of decomposition promoting material to obtain a dry material, performing drying treatment for 20min under the stirring condition of 450-470 ℃, and separating to obtain dry mud and decomposition promoting reclaimed materials, wherein the oil content of the dry mud is less than or equal to 0.03%; the decomposition promoting material comprises 800kg of pyrolysis promoting material and 50kg of quartz material, the pyrolysis promoting material is a high-chromium alloy steel ball, the particle size of the high-chromium alloy steel ball is 23-28 mm, the quartz material is river sand, the particle size of the river sand is smaller than 1.5mm, and more than 90% of the river sand has the particle size of 0.5-1.5 mm.
Example 3
In this embodiment, taking the example of treating the oily sludge in a certain air flotation tank of a large-scale treatment station in a hong Kong oil field Hongkong united station as an example, the water content of the oily sludge is about 88%, and the crude oil content is about 1.4%.
Transferring the oily sludge into a reaction tank by a lift pump to reach the volume of 1m3For example, the reduction processing is performed as follows:
s1, modifying, namely adding 0.35kg of lime and 0.1kg of sodium hydroxide at normal temperature, and adjusting the pH value of the oily sludge to 10;
s2, oxidizing, adding 0.5kg of sodium percarbonate, and stirring and reacting for 5min under the condition of introducing ozone, wherein the ozone introducing speed is 5 g/min;
s3, flocculating, adding 2.8g of polymeric aluminum ferric sulfate and 0.05g of polyacrylamide, and stirring to react for 1min, wherein the coagulant aid is an aqueous solution in the embodiment;
s4, dehydrating, namely separating the oily sludge treated in the step S3 at 1.6MPa by adopting a filter-pressing dehydration mode and a plate-and-frame filter-pressing dehydrator to obtain a mud cake and a liquid mixture, wherein the water content of the mud cake is 43.5%;
s5, oil-water separation, namely obtaining recovered crude oil and treated water through the gravity settling effect, wherein the water content of the recovered crude oil is less than or equal to 5g/kg, and the mechanical impurities are less than or equal to 5 g/kg; the oil content of the treated water is less than or equal to 50mg/L, and the suspended matter is less than or equal to 50 mg/L.
Preferably, in order to further reduce the mud cake obtained in step S4, taking 1t mud cake with water content of 43.5% as an example, the oil content of the mud cake is about 4%, that is, the water content in the mud cake is about 435kg, the soil content is about 525kg, and the oil content is about 40kg, the following operations can be further performed:
s6, dispersing, namely, scattering the mud cakes to obtain granules with the particle size of less than 10 mm;
s7, vaporizing, and vaporizing the granular material for 30min under the stirring condition of 110 ℃ in the nitrogen atmosphere to obtain a vaporized material;
s8, pyrolyzing, namely pyrolyzing the vaporized material for 40min under the stirring condition of 460-480 ℃ in the nitrogen atmosphere to obtain a pyrolyzed material, wherein the oil content of the pyrolyzed material is less than or equal to 0.3%, and the water content of the pyrolyzed material is less than or equal to 0.01%, and in the step, even if the appropriate pyrolysis treatment time is prolonged, the oil content of the pyrolyzed material is difficult to be reduced to be less than 0.1%, for example, the pyrolysis treatment time is increased to 90min, and the oil content of the pyrolyzed material is about 0.13%;
s9, performing innocent treatment, namely mixing the pyrolysis material with 500kg of decomposition promoting material to obtain a dry material, performing drying treatment for 25min under the stirring condition of 450-470 ℃, and separating to obtain dry mud and decomposition promoting reclaimed materials, wherein the oil content of the dry mud is less than or equal to 0.03%; the material comprises 490kg of pyrolysis promoting material and 10kg of quartz material, the pyrolysis promoting material is a high-chromium alloy steel ball, the particle size of the high-chromium alloy steel ball is 23-28 mm, the quartz material is sea sand washed by water for the second time, and the particle size of the sea sand is 0.5-1.5 mm.
The invention is not limited to the above-described examples, and various modifications or alterations without inventive work may be made by those skilled in the art within the scope of the invention defined by the claims appended hereto.
Claims (10)
1. The method for reducing the oily sludge is characterized by comprising the following steps of:
s1, modifying, namely adding 0.1-1 kg/m of modified starch at normal temperature3The pH value of the oily sludge is adjusted to 9-11, and the composite alkali comprises a calcium-containing substance and an alkaline substance;
s2, oxidizing, adding an oxidant, and stirring and reacting for 5-15 min under the condition of introducing ozone;
s3, flocculating, adding a flocculating agent, and stirring for reacting for 1-3 min;
s4, dehydrating, namely separating the oily sludge treated in the step S3 in a filter pressing dehydration mode to obtain a mud cake and a liquid mixture;
and S5, oil-water separation, wherein the liquid mixture is subjected to oil-water separation to obtain recovered crude oil and treated water.
2. The method for reducing the amount of the oily sludge according to claim 1, wherein in step S1, the calcium-containing substance is lime and the alkaline substance is sodium hydroxide or potassium hydroxide.
3. The method for reducing the amount of oily sludge according to claim 1, wherein the oxidizing agent is sodium percarbonate and the amount of sodium percarbonate added is 0.5 to 2kg/m in step S23。
4. The method for reducing the amount of the oily sludge according to claim 3, wherein in the step S2, the ozone is introduced at a concentration of 5 to 20 g/min.
5. The method for reducing the amount of oily sludge according to claim 1, wherein the flocculant is added in an amount of 2.5 to 10g/m in step S33。
6. The method for reducing the amount of the oily sludge according to claim 5, wherein in the step S3, the flocculant is one or more of polymeric ferric sulfate, polymeric aluminum chloride and polymeric aluminum ferric sulfate.
7. The method for reducing the amount of oily sludge according to claim 5, wherein 0.05 to 0.5g/m is further added in step S33The coagulant aid of (2), wherein the coagulant aid is polyacrylamide.
8. The method for reducing the amount of oily sludge according to claim 1, wherein the sludge cake obtained in step S4 is subjected to the following operations:
s6, dispersing, namely, scattering the mud cakes to obtain granules with the particle size of less than 15 mm;
s7, vaporizing, and vaporizing the granular material for 30-50 min under the stirring condition of 105-120 ℃ in the nitrogen atmosphere to obtain a vaporized material;
and S8, pyrolyzing, namely pyrolyzing the vaporized material for 40-60 min under the stirring condition of 450-500 ℃ in the nitrogen atmosphere to obtain a pyrolyzed material.
9. The method for reducing the amount of oily sludge according to claim 8, further comprising, after the step S8, the steps of:
s9, performing harmlessness, mixing 1 part of pyrolysis material and 0.25-2 parts of decomposition promoting material by weight to obtain a dry material, performing drying treatment for 20-30 min under the stirring condition of 500-550 ℃, and separating to obtain dry mud, wherein the oil content of the dry mud is less than or equal to 0.03%; the material accelerating material comprises pyrolysis accelerating material, the particle size of the pyrolysis accelerating material is 0.5-4 mm, and the pyrolysis accelerating material is stainless steel metal balls.
10. The method for reducing the oily sludge according to claim 9, wherein in step S9, the decomposition promoting material comprises 0.25-2 parts by weight of pyrolysis promoting material and 0-0.5 part by weight of quartz material, the pyrolysis promoting material is particulate matter with a particle size of 0.5-4 mm, the pyrolysis promoting material is made of inorganic matter with a melting point higher than 600 ℃, and the quartz material is at least one of river sand or sea sand.
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| CN114538746A (en) * | 2022-03-01 | 2022-05-27 | 陕西化工研究院有限公司 | Treatment method for separating oil sludge and sewage |
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