CN106746401B - Method for treating oily sludge - Google Patents
Method for treating oily sludge Download PDFInfo
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- CN106746401B CN106746401B CN201611174164.1A CN201611174164A CN106746401B CN 106746401 B CN106746401 B CN 106746401B CN 201611174164 A CN201611174164 A CN 201611174164A CN 106746401 B CN106746401 B CN 106746401B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses a method for treating oily sludge, which comprises a repairing agent, equipment and a using method of the equipment, wherein the repairing agent comprises quick lime, calcium oxide, magnesium oxide, volcanic ash and graphene, the using equipment consists of a first stirring system, a mechanical dehydration system, an oily sewage treatment system, a second stirring system, a solid-liquid separation system, a drying device, a gas treatment system, a brick making system and a granulation system, and the using method of the equipment has the advantages of wide application range, low energy consumption, low cost and no secondary pollution. Through multiple processes, waste water, waste residues and waste gas generated in the oily sludge treatment process can be thoroughly eliminated, meanwhile, heat, waste residues and purified water generated in the technical process can be recycled in the system, the treatment cost of the oily sludge is greatly reduced, the discharge of the treated waste water, waste residues and waste gas can meet the national environmental protection requirement, and the harmless treatment of the oily sludge is realized.
Description
Technical Field
The invention belongs to the technical field of oily sludge treatment, and particularly relates to a method for treating oily sludge.
Background
In recent years, the world demand for petroleum and mineral products is continuously increased, and further, a great amount of petroleum pollutants, including complex components, large output amount and serious harm of solid waste, namely oil-containing sludge, are generated in the processes of mining, refining, transporting and the like, and are also called as 'companion products' of petroleum production. At present, in the crude oil dehydration process, a large amount of oily sludge is generated at the bottom of a dehydration tank, an oil storage tank and the like. Meanwhile, a large amount of oily sludge exists in sewage treatment fields (such as oil separation tank bottoms, flotation tanks, aeration tanks and the like) of oil fields and oil refineries. Treating for 20000m per day3The sewage treatment plant generates about 20m per day3Oily sludge.
Oily sludge is a stable suspoemulsion system with extremely complex composition. Its composition includes a large amount of aged crude oil, solid suspended matter, bacteria and corrosion products, etc.; the treating agent such as corrosion inhibitor added in the production process is also left in the oily sludge, and simultaneously contains some toxic substances such as metal salts and benzene series. If these harmful components are not properly treated and directly discharged, they pose serious threats to the environment and human beings. However, the oily sludge also contains a large amount of petroleum substances, nutrient elements and various fungus substances, and has very high utilization value, so that the harmless treatment and resource utilization of the oily sludge are the core problems of the current petroleum industry and environmental protection.
Disclosure of Invention
In order to overcome the defects of the background art, the invention provides a method for treating oily sludge, which comprises a repairing agent for treating the oily sludge, and using equipment and an equipment using method thereof, and has the advantages of wide application range, low energy consumption, low cost and no secondary pollution.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the repairing agent for treating the oily sludge comprises the following components in parts by weight: 25-35 parts of 400-mesh quicklime, 5-15 parts of 400-mesh calcium oxide, 15-25 parts of 400-mesh magnesium oxide, 10-20 parts of 400-mesh volcanic ash and 3-10 parts of 800-mesh graphene; wherein the activity degree of calcium oxide is more than or equal to 95 percent, dry material mixing equipment is adopted, the materials are added in proportion and mixed uniformly, and the repairing agent is obtained.
A using device of a repairing agent for oily sludge treatment comprises a first stirring system, a mechanical dehydration system, an oily sewage treatment system, a second stirring system, a solid-liquid separation system, a drying device, a gas treatment system, a brick making system and a granulation system; the repairing agent is added in the first stirring system and the second stirring system according to the mass ratio of the repairing agent to the oily sludge of 0.5-1: 8-10; the discharge port of the first stirring system is connected with the mechanical dehydration system through a spiral conveying pipeline; a sludge outlet of the mechanical dehydration system is connected with the second stirring system, and a water outlet of the mechanical dehydration system is connected with the oily sewage treatment system; a discharge port of the second stirring system is connected with a solid-liquid separation device, a water outlet of the solid-liquid separation device is connected with an oily sewage treatment system, a sludge outlet of the solid-liquid separation device is connected with a drying device, the drying device is connected with a combustion furnace, and the combustion furnace provides high-temperature flue gas for the drying device; an air outlet of the drying device is connected with the gas treatment system, and a discharge port of the drying device is connected with the granulation system; the granulation system is connected with the combustion furnace through the automatic feeding system; the slag discharging port of the combustion furnace is connected with a brick making system.
Preferably, the mechanical dewatering system comprises a sludge concentration dewatering machine, a feed inlet of the sludge concentration dewatering machine is connected with the mixer through a pipeline, a discharge outlet of the sludge concentration dewatering machine is connected with the conveyor, a water inlet of the sludge concentration dewatering machine is connected with the flushing pump through a pipeline, and a water inlet of the flushing pump is connected with the water tank through a pipeline; the feed inlet of the mixer is connected with a sludge pump and a dosing pump, and the feed inlet of the dosing pump is connected with a dosing tank. The sludge concentration dewatering machine is a process of squeezing sludge between two filter belts by means of mechanical force and squeezing out water. Firstly, simultaneously pumping sludge and a dissolved polymer medicament into a mixer, and after the sludge and the medicament are fully and uniformly mixed, feeding the mixture into a sludge concentration dehydrator; the sludge is filtered out partial water in the concentration section of the sludge concentration dehydrator under the action of gravity, and enters the filter pressing section of the sludge concentration dehydrator under the slow drive of the filter cloth; the sludge is extruded between the two tensioned filter cloths by the roller to continuously discharge moisture, and finally a sludge cake state is formed on the filter cloths; the mud cake falls from the filter cloth under the action of the discharging device and is collected, the filter cloth is cleaned by flushing water in the rotation process and then is subjected to pressure filtration again, and the flushing water and filtered water flow out after being collected.
Preferably, the oily sewage treatment system comprises an inclined plate sedimentation tank, an oil-water separator, a sedimentation module, an A/O biological contact tank and a filtering module which are sequentially connected through a pipeline, wherein a sump oil outlet of the oil-water separator is connected with a sump oil tank; the filtering module comprises a multi-layer filtering material filtering module, a modified fiber filtering module and a sintering filtering module which are sequentially connected through a pipeline. The inclined plate sedimentation tank improves the treatment capacity of the sedimentation tank by using the laminar flow principle, and simultaneously shortens the sedimentation distance of particles, thereby shortening the sedimentation time; the sedimentation area of the sedimentation tank is increased, so that the treatment efficiency is improved; separating oil from water by an oil-water separator; the settling module is a settler for settling, and solid particles in the fluid are settled by using the difference of gravity; the A/O process in the A/O biological contact tank is an anaerobic/aerobic process; the filtering module filters the treated water for multiple times.
Preferably, the gas treatment system comprises a spray chamber, a primary cyclone dust removal device, a secondary cyclone dust removal device, a desulfurization chamber and a denitration chamber which are sequentially connected through pipelines in the advancing direction of flue gas; the inside lower extreme of spray room be provided with the dust sedimentation tank, the inside limestone solution that sets up of desulfurization room, the inside active coke, the active carbon adsorbed layer of being provided with of denitration room.
Preferably, the first stirring system and the second stirring system are internally provided with ultrasonic generators.
The use method of the equipment for using the remediation agent for the treatment of the oily sludge comprises the following steps:
(1) preparing a repairing agent: adding dry material mixing equipment in proportion, and uniformly mixing to obtain the repairing agent;
(2) pre-stirring treatment: putting the oily sludge into a first stirring system, pre-stirring, heating to 20-40 ℃, adding a repairing agent, maintaining the temperature, and performing ultrasonic treatment, wherein the ultrasonic treatment comprises low-frequency ultrasonic treatment and high-frequency ultrasonic treatment, the frequency of the low-frequency ultrasonic treatment is 10-15kHz, the frequency of the high-frequency ultrasonic treatment is 50-80kHz, the frequency ratio of the low-frequency ultrasonic treatment to the high-frequency ultrasonic treatment is 1:2, and the time of the ultrasonic treatment is 1-1.5 hours;
(3) mechanical dehydration: performing mechanical dehydration treatment on the oily sludge collected in the step (2) to ensure that the water content of the oily sludge is lower than 60%, separating the sludge from oily sewage, and treating the oily sewage in an oily sewage treatment system;
(4) and (3) stirring again: putting the sludge collected in the step (3) into a second stirring system, stirring, adding a repairing agent and auxiliary materials, mixing and stirring uniformly, wherein the weight ratio of the auxiliary materials to the sludge is 4-2:0.5, performing ultrasonic treatment on the sludge, wherein the ultrasonic treatment comprises low-frequency ultrasonic treatment and high-frequency ultrasonic treatment, the frequency of the low-frequency ultrasonic treatment is 10-15kHz, the frequency of the high-frequency ultrasonic treatment is 30-50kHz, the frequency ratio of the low-frequency ultrasonic treatment to the high-frequency ultrasonic treatment is 2:3, and the time of the ultrasonic treatment is 0.5-1 h;
(5) solid-liquid separation: performing solid-liquid separation on the sludge collected in the step (4) to ensure that the water content of the sludge is lower than 40%, separating dirty oil in the sludge again, and collecting the dirty oil to enter an oily sewage treatment system for treatment;
(6) and (3) drying treatment: heating and drying the sludge collected in the step (5) at the temperature of 400-500 ℃ in a drying device to reduce the water content of the sludge to 10-20% to prepare a drying raw material and generate flue gas;
(7) and (3) granulation: granulating the drying raw material collected in the step (6) to obtain granules with the granularity of 5-10mm, and then putting the granules into a combustion furnace for combustion to prepare high-temperature flue gas used by a drying device;
(8) waste gas treatment: spraying, two-stage cyclone dust removal, desulfurization and denitration treatment are carried out on the flue gas generated in the step (6), finally, the purified air is discharged through a chimney, and the content of the purified gas particles is less than or equal to 50mg/m3The content of sulfur dioxide is less than or equal to 40mg/m3The content of nitrogen oxide is less than or equal to 100mg/m3The blackness of the flue gas is less than or equal to grade 1;
(9) treating oily sewage: and (4) putting the oily sewage collected in the steps (3) and (5) into an oily sewage treatment system for treatment, purifying the oily sewage by an inclined plate sedimentation tank, an oil-water separator, a sedimentation module, an A/O biological contact tank and a filtration module, and spraying the purified water in the step (8) for recycling.
Preferably, the auxiliary material added in the step (4) is sawdust or grass powder.
Compared with the prior art, the invention has the advantages that:
(1) the invention carries out two-stage stirring treatment on the oily sludge, and simultaneously adds an ultrasonic treatment technology in the stirring process, so that the oily sewage can be quickly separated from the silt, and the invention has the advantages of stronger applicability, low energy consumption, low cost and no secondary pollution;
(2) the invention carries out two-stage dehydration on the oily sludge, firstly, the first-stage mechanical dehydration is carried out, then, the solid-liquid separation dehydration is carried out, and through the two-stage dehydration, the better separation of silt and dirty oil can be realized, thereby laying a better foundation for the subsequent treatment;
(3) the invention designs the oily sewage treatment system, the system can adapt to the treatment of the oily sewage with large flow, the simple batch parallel connection of small sample machines is avoided, the application capability of fluctuation change of water quality and water quantity is stronger, the system has higher operation elasticity, and meanwhile, the system has compact and reasonable structure, reliable working operation and lower cost, can quickly realize oil-water separation, has higher automation degree, can discharge the treated water after reaching the standard, and can be used for a spraying chamber in waste gas treatment to spray dusty flue gas so as to realize the reutilization of resources; the system has wide treatment index range, the oil content of the sewage can be 5-200000ppm, the suspended matter content is 15-2000ppm, the COD content is 100-1000-3/h-100m3/h；
(4) According to the drying device and the combustion furnace designed by the invention, the drying device is used for drying the oily sludge, the dried oily sludge provides fuel for the combustion furnace through the granulating device, the combustion fuel of the combustion furnace provides high-temperature flue gas required by drying for the drying device, and meanwhile, the slag of the combustion furnace is used for preparing bricks, so that the cyclic utilization of the oily sludge is realized, and the environment is not polluted;
(5) the invention designs a gas treatment system, thoroughly purifies the flue gas generated in the working process of the drying device, the gas purified by the purification system meets the environmental emission standard, the equipment investment used by the system is small, the system is suitable for purifying the smoke dust of a combustion furnace, and the system has high social benefit and economic benefit and has wider development prospect.
Drawings
FIG. 1 is a schematic block diagram of a process flow for treating oily sludge by the apparatus of the present invention;
FIG. 2 is a schematic diagram of the mechanical dewatering system of the present invention;
FIG. 3 is a schematic block diagram of a process flow of an oily wastewater treatment system of the present invention;
FIG. 4 is a schematic block diagram of a process flow for a gas treatment system of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
example 1
As shown in fig. 1, which is a schematic block diagram of a process flow for treating oily sludge by the equipment of the present invention, the equipment for treating oily sludge of the present invention is composed of a first stirring system 1, a mechanical dehydration system 2, an oily sewage treatment system 7, a second stirring system 3, a solid-liquid separation system 4, a drying device 5, a gas treatment system 9, a brick making system 10 and a granulation system 8; the discharge port of the first stirring system 1 is connected with the mechanical dehydration system 2 through a spiral conveying pipeline; a sludge outlet of the mechanical dehydration system 2 is connected with the second stirring system 3, and a water outlet of the mechanical dehydration system 2 is connected with an oily sewage treatment system 7; a discharge port of the second stirring system 3 is connected with a solid-liquid separation device 4, a water outlet of the solid-liquid separation device 4 is connected with an oily sewage treatment system 7, a sludge outlet of the solid-liquid separation device 4 is connected with a drying device 5, the drying device 5 is connected with a combustion furnace 6, and the combustion furnace 6 provides high-temperature flue gas for the drying device; an air outlet of the drying device 5 is connected with a gas treatment system 9, and a discharge port of the drying device 5 is connected with a granulation system 8; the granulation system 8 is connected with the combustion furnace 6 through an automatic feeding system; the slag discharge port of the combustion furnace 6 is connected with a brick making system 10.
As shown in fig. 2, the mechanical dewatering system includes a sludge concentration dewatering machine 20, a feed inlet of the sludge concentration dewatering machine 20 is connected with a mixer 21 through a pipeline, a discharge outlet of the sludge concentration dewatering machine 20 is connected with a conveyor 22, a water inlet of the sludge concentration dewatering machine 20 is connected with a flushing pump 23 through a pipeline, and a water inlet of the flushing pump 23 is connected with a water tank 24 through a pipeline; the feed inlet of the mixer 21 is connected with a sludge pump 25 and a dosing pump 26, and the feed inlet of the dosing pump 26 is connected with a dosing tank 27.
As shown in fig. 3, the oily sewage treatment system comprises an inclined plate sedimentation tank 30, an oil-water separator 31, a sedimentation module 33, an a/O biological contact tank 34 and a filtration module 35 which are sequentially connected through a pipeline, wherein a dirty oil outlet of the oil-water separator 31 is connected with a dirty oil tank 36; the filter module 35 comprises a multi-layer filter material filter module 37, a modified fiber filter module 38 and a sintered filter module 39 which are sequentially connected through a pipeline.
As shown in fig. 4, the gas treatment system comprises a spray chamber 40, a primary cyclone dust collector 41, a secondary cyclone dust collector 42, a desulfurization chamber 43 and a denitration chamber 44 which are sequentially connected through pipelines in the flue gas advancing direction; the inside lower extreme of spray room 40 be provided with the dust sedimentation tank, desulfurization room 43 inside set up the limestone solution, denitration room 44 inside be provided with active coke, active carbon adsorption layer.
And ultrasonic generators are arranged in the first stirring system 1 and the second stirring system 3.
Example 2
The use method of the remediation agent for oily sludge treatment using the remediation agent and the equipment described in example 1 comprises the following steps:
(1) preparing a repairing agent: according to the weight parts, 30 parts of 400-mesh quicklime, 10 parts of 400-mesh calcium oxide, 20 parts of 400-mesh magnesium oxide, 15 parts of 400-mesh volcanic ash and 5 parts of 800-mesh graphene are taken; wherein, the activity degree of calcium oxide is more than or equal to 95 percent, dry material mixing equipment is adopted, and the materials are added in proportion and uniformly mixed to obtain the repairing agent;
(2) pre-stirring treatment: putting the oily sludge into a first stirring system, pre-stirring, heating to 20 ℃, adding a repairing agent, maintaining the mass ratio of the repairing agent to the sludge at 0.5:10, and carrying out ultrasonic treatment, wherein the ultrasonic treatment comprises low-frequency ultrasonic treatment and high-frequency ultrasonic treatment, the frequency of the low-frequency ultrasonic is 10kHz, the frequency of the high-frequency ultrasonic is 50kHz, the frequency ratio of the low-frequency ultrasonic to the high-frequency ultrasonic is 1:2, and the time of the ultrasonic treatment is 1 h;
(3) mechanical dehydration: performing mechanical dehydration treatment on the oily sludge collected in the step (2) to ensure that the water content of the oily sludge is 50%, separating the sludge from oily sewage, and treating the oily sewage in an oily sewage treatment system;
(4) and (3) stirring again: and (3) putting the sludge collected in the step (3) into a second stirring system for stirring, adding a repairing agent and an auxiliary material, mixing and stirring uniformly, wherein the ratio of the repairing agent to the sludge is 0.5:10, and the weight ratio of the auxiliary material to the sludge is 4: 0.5, carrying out ultrasonic treatment on the mixture, wherein the ultrasonic treatment comprises low-frequency ultrasonic treatment and high-frequency ultrasonic treatment, the frequency of the low-frequency ultrasonic treatment is 10kHz, the frequency of the high-frequency ultrasonic treatment is 30kHz, the frequency ratio of the low-frequency ultrasonic treatment to the high-frequency ultrasonic treatment is 2:3, and the ultrasonic treatment time is 0.5 h;
(5) solid-liquid separation: performing solid-liquid separation on the sludge collected in the step (4) to ensure that the water content of the sludge is 30%, separating dirty oil in the sludge again, and collecting the dirty oil to enter an oily sewage treatment system for treatment;
(6) and (3) drying treatment: heating and drying the sludge collected in the step (5) at the temperature of 400 ℃ in a drying device to enable the water content of the sludge to reach 10 percent, preparing a drying raw material and generating flue gas;
(7) and (3) granulation: granulating the dried raw material collected in the step (6) to obtain granules with the granularity of 5mm, and then putting the granules into a combustion furnace for combustion to prepare high-temperature flue gas used by a drying device;
(8) waste gas treatment: spraying, two-stage cyclone dust removal, desulfurization and denitration treatment are carried out on the flue gas generated in the step (6), finally, purified air is discharged through a chimney, and the content of the purified gas particles is 40mg/m3The sulfur dioxide content is 30mg/m3The content of nitrogen oxides is 80mg/m3The blackness of the flue gas is less than or equal to grade 1;
(9) treating oily sewage: and (4) putting the oily sewage collected in the steps (3) and (5) into an oily sewage treatment system for treatment, purifying the oily sewage by an inclined plate sedimentation tank, an oil-water separator, a sedimentation module, an A/O biological contact tank and a filtration module, and spraying the purified water in the step (8) for recycling.
Wherein the auxiliary material added in the step (4) is sawdust.
Example 3
The use method of the remediation agent for oily sludge treatment using the remediation agent and the equipment described in example 1 comprises the following steps:
(1) preparing a repairing agent: according to the weight parts, 25-35 parts of 400-mesh quicklime, 5-15 parts of 400-mesh calcium oxide, 15 parts of 400-mesh magnesium oxide, 10 parts of 400-mesh volcanic ash and 3 parts of 800-mesh graphene are taken; wherein, the activity degree of calcium oxide is more than or equal to 95 percent, dry material mixing equipment is adopted, and the materials are added in proportion and uniformly mixed to obtain the repairing agent;
(2) pre-stirring treatment: putting the oily sludge into a first stirring system, pre-stirring, heating to 30 ℃, adding a repairing agent, maintaining the mass ratio of the repairing agent to the sludge at 0.8:9, and carrying out ultrasonic treatment, wherein the ultrasonic treatment comprises low-frequency ultrasonic treatment and high-frequency ultrasonic treatment, the frequency of the low-frequency ultrasonic is 13kHz, the frequency of the high-frequency ultrasonic is 60kHz, the frequency ratio of the low-frequency ultrasonic to the high-frequency ultrasonic is 1:2, and the time of the ultrasonic treatment is 1.2 h;
(3) mechanical dehydration: performing mechanical dehydration treatment on the oily sludge collected in the step (2) to ensure that the water content of the oily sludge is 55%, separating the sludge from oily sewage, and treating the oily sewage in an oily sewage treatment system;
(4) and (3) stirring again: putting the sludge collected in the step (3) into a second stirring system, stirring, adding a repairing agent and an auxiliary material, mixing and stirring uniformly, wherein the mass ratio of the repairing agent to the sludge is 0.8:9, the weight ratio of the auxiliary material to the sludge is 3:0.5, performing ultrasonic treatment on the sludge, wherein the ultrasonic treatment comprises low-frequency ultrasonic treatment and high-frequency ultrasonic treatment, the frequency of the low-frequency ultrasonic treatment is 13kHz, the frequency of the high-frequency ultrasonic treatment is 40kHz, the frequency ratio of the low-frequency ultrasonic treatment to the high-frequency ultrasonic treatment is 2:3, and the time of the ultrasonic treatment is 0.8 h;
(5) solid-liquid separation: performing solid-liquid separation on the sludge collected in the step (4) to ensure that the water content of the sludge is 30%, separating dirty oil in the sludge again, and collecting the dirty oil to enter an oily sewage treatment system for treatment;
(6) and (3) drying treatment: heating and drying the sludge collected in the step (5) at the temperature of 450 ℃ in a drying device to enable the water content of the sludge to reach 15%, so as to prepare a drying raw material and generate flue gas;
(7) and (3) granulation: granulating the dried raw material collected in the step (6) to obtain granules with the granularity of 7mm, and then putting the granules into a combustion furnace for combustion to prepare high-temperature flue gas used by a drying device;
(8) waste gas treatment: spraying, two-stage cyclone dust removal, desulfurization and denitration treatment are carried out on the flue gas generated in the step (6), finally, purified air is discharged through a chimney, and the content of the purified gas particles is 45mg/m3The sulfur dioxide content is 36mg/m3The content of nitrogen oxides is 92mg/m3The blackness of the flue gas is less than or equal to grade 1;
(9) treating oily sewage: and (4) putting the oily sewage collected in the steps (3) and (5) into an oily sewage treatment system for treatment, purifying the oily sewage by an inclined plate sedimentation tank, an oil-water separator, a sedimentation module, an A/O biological contact tank and a filtration module, and spraying the purified water in the step (8) for recycling.
Wherein the auxiliary material added in the step (4) is grass meal.
Example 4
The use method of the remediation agent for oily sludge treatment using the remediation agent and the equipment described in example 1 comprises the following steps:
(1) preparing a repairing agent: according to the weight parts, 35 parts of 400-mesh quicklime, 15 parts of 400-mesh calcium oxide, 25 parts of 400-mesh magnesium oxide, 20 parts of 400-mesh volcanic ash and 10 parts of 800-mesh graphene are taken; wherein, the activity degree of calcium oxide is more than or equal to 95 percent, dry material mixing equipment is adopted, and the materials are added in proportion and uniformly mixed to obtain the repairing agent;
(2) pre-stirring treatment: putting oil-containing sludge into a first stirring system, pre-stirring, heating to 40 ℃, adding a repairing agent, wherein the mass ratio of the repairing agent to the sludge is 1:8, pre-stirring, heating to 40 ℃, maintaining the temperature, and carrying out ultrasonic treatment, wherein the ultrasonic treatment comprises low-frequency ultrasonic treatment and high-frequency ultrasonic treatment, the frequency of the low-frequency ultrasonic is 15kHz, the frequency of the high-frequency ultrasonic is 80kHz, the frequency ratio of the low-frequency ultrasonic to the high-frequency ultrasonic is 1:2, and the time of the ultrasonic treatment is 1.5 h;
(3) mechanical dehydration: performing mechanical dehydration treatment on the oily sludge collected in the step (2) to ensure that the water content of the oily sludge is 50%, separating the sludge from oily sewage, and treating the oily sewage in an oily sewage treatment system;
(4) and (3) stirring again: putting the sludge collected in the step (3) into a second stirring system, stirring, adding a repairing agent and an auxiliary material, mixing and stirring uniformly, wherein the mass ratio of the repairing agent to the sludge is 1:8, the weight ratio of the auxiliary material to the sludge is 2:0.5, performing ultrasonic treatment on the sludge, wherein the ultrasonic treatment comprises low-frequency ultrasonic treatment and high-frequency ultrasonic treatment, the frequency of the low-frequency ultrasonic treatment is 15kHz, the frequency of the high-frequency ultrasonic treatment is 50kHz, the frequency ratio of the low-frequency ultrasonic treatment to the high-frequency ultrasonic treatment is 2:3, and the time of the ultrasonic treatment is 1 h;
(5) solid-liquid separation: performing solid-liquid separation on the sludge collected in the step (4) to enable the water content of the sludge to be 28%, separating dirty oil in the sludge again, and collecting the dirty oil to enter an oily sewage treatment system for treatment;
(6) and (3) drying treatment: heating and drying the sludge collected in the step (5) at the temperature of 500 ℃ in a drying device to enable the water content of the sludge to reach 18 percent, preparing a drying raw material and generating flue gas;
(7) and (3) granulation: granulating the dried raw material collected in the step (6) to obtain granules with the granularity of 10mm, and then putting the granules into a combustion furnace for combustion to prepare high-temperature flue gas used by a drying device;
(8) waste gas treatment: spraying, two-stage cyclone dust removal, desulfurization and denitration treatment are carried out on the flue gas generated in the step (6), finally, purified air is discharged through a chimney, and the content of the purified gas particles is 40mg/m3The sulfur dioxide content is 30mg/m3The content of nitrogen oxides is 80mg/m3The blackness of the flue gas is less than or equal to grade 1;
(9) treating oily sewage: and (4) putting the oily sewage collected in the steps (3) and (5) into an oily sewage treatment system for treatment, purifying the oily sewage by an inclined plate sedimentation tank, an oil-water separator, a sedimentation module, an A/O biological contact tank and a filtration module, and spraying the purified water in the step (8) for recycling.
Wherein the auxiliary material added in the step (4) is sawdust.
Through the specific use of the equipment and the method for the harmless treatment of the oily sludge in the invention in the embodiments 2, 3 and 4, the finally purified air meets the following standards through test determination: the content of the particles is less than or equal to 50mg/m3The content of sulfur dioxide is less than or equal to 40mg/m3The content of nitrogen oxide is less than or equal to 100mg/m3And the blackness of the smoke is less than or equal to grade 1.
The method for harmless treatment of the oil field sump oil provided by the invention is used for degrading and removing sulfide, polymers, surfactants and the like in the sump oil by ultrasonic treatment of the first stirring system and the second stirring system aiming at the oil field sump oil generated by landing sump oil, fracturing flow-back fluid, tank cleaning sump oil, sewage treatment and the like. The viscosity of a dirty oil system is greatly reduced, the three-phase composite emulsification state of water, oil and solid particles is destroyed, crude oil is easily separated from the emulsification system, the crude oil is treated by an oily sewage treatment system and can be directly discharged or recycled, and sludge is used for making bricks after being treated by a drying device, so that secondary pollution is avoided.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (1)
1. A method for treating oily sludge comprises a repairing agent, equipment and a using method of the equipment, and is characterized in that:
the repairing agent comprises:
comprises the following components in parts by weight: 30 parts of 400-mesh quicklime, 10 parts of 400-mesh calcium oxide, 20 parts of 400-mesh magnesium oxide, 15 parts of 400-mesh volcanic ash and 5 parts of 800-mesh graphene; wherein the activity degree of calcium oxide is more than or equal to 95 percent;
the device is:
the system consists of a first stirring system, a mechanical dehydration system, an oily sewage treatment system, a second stirring system, a solid-liquid separation system, a drying device, a gas treatment system, a brick making system and a granulation system; the repairing agent is added in the first stirring system and the second stirring system according to the mass ratio of the repairing agent to the oily sludge of 0.5-1: 8-10; the discharge port of the first stirring system is connected with the mechanical dehydration system through a spiral conveying pipeline; a sludge outlet of the mechanical dehydration system is connected with the second stirring system, and a water outlet of the mechanical dehydration system is connected with the oily sewage treatment system; a discharge port of the second stirring system is connected with a solid-liquid separation device, a water outlet of the solid-liquid separation device is connected with an oily sewage treatment system, a sludge outlet of the solid-liquid separation device is connected with a drying device, the drying device is connected with a combustion furnace, and the combustion furnace provides high-temperature flue gas for the drying device; an air outlet of the drying device is connected with the gas treatment system, and a discharge port of the drying device is connected with the granulation system; the granulation system is connected with the combustion furnace through the automatic feeding system; the slag discharging port of the combustion furnace is connected with a brick making system;
wherein the content of the first and second substances,
the mechanical dehydration system comprises a sludge concentration dehydrator, a feed inlet of the sludge concentration dehydrator is connected with a mixer through a pipeline, a discharge outlet of the sludge concentration dehydrator is connected with a conveyor, a water inlet of the sludge concentration dehydrator is connected with a flushing pump through a pipeline, and a water inlet of the flushing pump is connected with a water tank through a pipeline; a feed port of the mixer is connected with a sludge pump and a dosing pump, and a feed port of the dosing pump is connected with a dosing tank;
the oily sewage treatment system comprises an inclined plate sedimentation tank, an oil-water separator, a sedimentation module, an A/O biological contact tank and a filtering module which are sequentially connected through a pipeline, wherein a sump oil outlet of the oil-water separator is connected with a sump oil tank; the filtering module comprises a multi-layer filter material filtering module, a modified fiber filtering module and a sintering filtering module which are sequentially connected by a pipeline;
the gas treatment system comprises a spray chamber, a primary cyclone dust removal device, a secondary cyclone dust removal device, a desulfurization chamber and a denitrification chamber which are sequentially connected through pipelines in the smoke advancing direction; a dust sedimentation tank is arranged at the lower end in the spraying chamber, a limestone solution is arranged in the desulfurization chamber, and activated coke and an activated carbon adsorption layer are arranged in the denitrification chamber;
ultrasonic generators are arranged in the first stirring system and the second stirring system; the use method of the device comprises the following steps:
(1) preparing a repairing agent: adding dry material mixing equipment in proportion, and uniformly mixing to obtain the repairing agent;
(2) pre-stirring treatment: putting the oily sludge into a first stirring system, pre-stirring, heating to 20 ℃, adding a repairing agent, maintaining the mass ratio of the repairing agent to the sludge at 0.5:10, and carrying out ultrasonic treatment, wherein the ultrasonic treatment comprises low-frequency ultrasonic treatment and high-frequency ultrasonic treatment, the frequency of the low-frequency ultrasonic is 10kHz, the frequency of the high-frequency ultrasonic is 50kHz, the frequency ratio of the low-frequency ultrasonic to the high-frequency ultrasonic is 1:2, and the time of the ultrasonic treatment is 1 h;
(3) mechanical dehydration: performing mechanical dehydration treatment on the oily sludge collected in the step (2) to ensure that the water content of the oily sludge is lower than 60%, separating the sludge from oily sewage, and treating the oily sewage in an oily sewage treatment system;
(4) and (3) stirring again: and (3) putting the sludge collected in the step (3) into a second stirring system for stirring, adding a repairing agent and an auxiliary material, mixing and stirring uniformly, wherein the ratio of the repairing agent to the sludge is 0.5:10, and the weight ratio of the auxiliary material to the sludge is 4: 0.5, carrying out ultrasonic treatment on the mixture, wherein the ultrasonic treatment comprises low-frequency ultrasonic treatment and high-frequency ultrasonic treatment, the frequency of the low-frequency ultrasonic treatment is 10kHz, the frequency of the high-frequency ultrasonic treatment is 30kHz, the frequency ratio of the low-frequency ultrasonic treatment to the high-frequency ultrasonic treatment is 2:3, and the ultrasonic treatment time is 0.5 h;
(5) solid-liquid separation: performing solid-liquid separation on the sludge collected in the step (4) to ensure that the water content of the sludge is lower than 40%, separating the oily sewage in the sludge again, and collecting the oily sewage to enter an oily sewage treatment system for treatment;
(6) and (3) drying treatment: heating and drying the sludge collected in the step (5) at the temperature of 400 ℃ in a drying device to enable the water content of the sludge to reach 10 percent, preparing a drying raw material and generating flue gas;
(7) and (3) granulation: granulating the dried raw materials collected in the step (6) to obtain granules with the granularity of 5mm, and then putting the granules into a combustion furnace for combustion to prepare high-temperature flue gas used by a drying device;
(8) waste gas treatment: spraying, two-stage cyclone dust removal, desulfurization and denitration treatment are carried out on the flue gas generated in the step (6), finally, the purified air is discharged through a chimney, the content of the purified gas particles is 40mg/m3, the content of sulfur dioxide is 30mg/m3, the content of nitrogen oxide is 80mg/m3, and the blackness of the flue gas is less than or equal to 1 level;
(9) treating oily sewage: putting the oily sewage collected in the steps (3) and (5) into an oily sewage treatment system for treatment, purifying the oily sewage by an inclined plate sedimentation tank, an oil-water separator, a sedimentation module, an A/O biological contact tank and a filtration module, and spraying the purified water in the step (8) for recycling; wherein the auxiliary material added in the step (4) is sawdust or grass powder.
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| CN107473564B (en) * | 2017-09-26 | 2023-08-29 | 重庆盎瑞悦科技有限公司 | Harmless treatment method and system for domestic sludge |
| CN111533396A (en) * | 2020-04-13 | 2020-08-14 | 湖州智清环保科技有限公司 | Novel urban oily sludge modified curing agent |
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