CN113060915A - Oily sludge treatment process - Google Patents
Oily sludge treatment process Download PDFInfo
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- CN113060915A CN113060915A CN202110414793.1A CN202110414793A CN113060915A CN 113060915 A CN113060915 A CN 113060915A CN 202110414793 A CN202110414793 A CN 202110414793A CN 113060915 A CN113060915 A CN 113060915A
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- 239000010802 sludge Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000008569 process Effects 0.000 title claims abstract description 26
- 239000007787 solid Substances 0.000 claims abstract description 63
- 239000012535 impurity Substances 0.000 claims abstract description 45
- 239000002002 slurry Substances 0.000 claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 23
- 239000010865 sewage Substances 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 238000012216 screening Methods 0.000 claims abstract description 12
- 238000005406 washing Methods 0.000 claims abstract description 8
- 238000004064 recycling Methods 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 5
- 238000005189 flocculation Methods 0.000 claims description 3
- 230000016615 flocculation Effects 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 description 8
- 239000012459 cleaning agent Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 238000010907 mechanical stirring Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 239000012634 fragment Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005188 flotation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses an oily sludge treatment process, which is characterized by comprising the following steps: chemically hot washing and stirring the oil-containing sludge to separate out a dirty oil component and a slurry component; sequentially screening solid impurity components with the sizes above the technological requirements and solid particle components with the sizes above 0.1 mm from the slurry components to obtain sewage components; respectively recovering the dirty oil component, the solid impurity component and the solid particle component; treating the sewage components for recycling; solves the problem that the prior treatment method only simply separates the solid impurities with larger sizes from the oily sludge in advance and does not effectively treat the solid impurities, thereby not meeting the environmental protection requirement.
Description
Technical Field
The invention relates to a method for treating oily sludge in the field of environmental protection.
Background
The oil field oily sludge environment-friendly treatment method comprises a solidification treatment technology, an incineration treatment technology, a bioremediation treatment technology, a solvent extraction treatment technology, a chemical hot washing treatment technology, a pyrolysis treatment technology, a comprehensive treatment technology and the like.
The chemical hot washing treatment technology is relatively applied, and in the prior art, due to the limitation of processes and equipment, a certain amount of solid impurities such as colored strip cloth, woven bag fragments, labor protection supplies, weeds, tile blocks, iron wires and the like are often doped in the oil sludge. The oily sludge is wrapped outside the larger solid impurities with the diameter of more than 10 mm in the oily sludge, and in most cases, the larger solid impurities are separated from the oily sludge by a manual or mechanical method, and then the separated larger solid impurities are treated in a stacking or landfill mode without participating in the subsequent treatment of the oily sludge.
Because a large amount of oily sludge is inevitably wrapped by the large-size solid impurities, the treatment modes such as direct landfill and the like are adopted, and the requirements on environmental protection are not met.
There is no good process and equipment for treating oily sludge containing large-sized solid impurities therein.
Disclosure of Invention
In view of the above, the invention provides an oily sludge treatment process, which solves the problem that the existing treatment method simply separates large-size solid impurities from oily sludge in advance and does not effectively treat the solid impurities, so that the treatment method does not meet the environmental protection requirement.
In order to achieve the above object, the oil-containing sludge treatment process is characterized by comprising the following steps:
chemically hot washing and stirring the oil-containing sludge to separate out a dirty oil component and a slurry component;
sequentially screening solid impurity components with the sizes above the technological requirements and solid particle components with the sizes above 0.1 mm from the slurry components to obtain sewage components;
respectively recovering the dirty oil component, the solid impurity component and the solid particle component;
and treating the sewage components for recycling.
Further, the chemical hot washing and stirring of the oily sludge is carried out in a washing machine;
the cleaning machine comprises a stirring container;
an oil collecting tank is arranged above the stirring container, and a discharge hole is arranged below the stirring container;
the oil collecting tank is provided with an oil outlet;
the dirty oil component overflows from the oil outlet and is discharged;
the slurry component is discharged from the discharge port.
Further, the device for screening out the solid impurity components is a roller screen;
the discharge port of the cleaning machine corresponds to the feed port of the roller screen;
the screen drum of the roller screen is provided with an internal spiral structure;
the internal spiral structure is used for automatically conveying the solid impurity components to the tail end of the screen cylinder and discharging the solid impurity components from an outlet of the screen cylinder when the roller screen rolls;
the mesh specification of the screen cylinder meets the process requirement.
Further, the apparatus for screening out the solid particulate component comprises a slurry buffer tank;
the slurry buffer groove receives materials falling from the meshes;
the mud buffer tank is connected with a mud pump;
the mud pump conveys the material to a mud vibrating screen;
the mud vibrating screen is used for screening the materials into the solid particle component and the sewage component.
Further, a screw conveying mechanism is arranged between the slurry buffer tank and the slurry pump;
and the spiral conveying mechanism is used for conveying the material to a suction port of the mud pump.
Further, the method for treating the sewage components comprises centrifugal treatment and/or flocculation sedimentation air flotation treatment and/or steam heating treatment.
The invention has the following beneficial effects:
according to the oily sludge treatment process, oily sludge mixed with solid impurities is chemically cleaned, the oily sludge on the solid impurities is separated out through a roller screen after being cleaned and is conveyed to a specified area, and the solid impurities at the moment are removed of the oily sludge wrapped on the solid impurities, so that the solid impurities after chemical cleaning meet the environmental protection requirement and can be discharged up to the standard; in addition, solid impurities in the oily sludge are screened out, solid particle components with the size of more than 0.1 mm are continuously screened out, solid-liquid separation workload and mechanical abrasion of a centrifuge used in sewage treatment can be reduced, and the service life of the centrifuge is prolonged by reducing high-speed friction of large-size silt.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 is a schematic flow diagram of an apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic view of a cleaning machine according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a roller screen according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a slurry surge tank according to an embodiment of the present invention;
FIG. 5 is a diagram of the engagement of a shale shaker with a mud saver in accordance with an embodiment of the present invention;
fig. 6 is a side view of fig. 5.
Detailed Description
The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth. However, the present invention may be fully understood by those skilled in the art for those parts not described in detail.
Furthermore, those skilled in the art will appreciate that the drawings are provided solely for the purposes of illustrating the invention, features and advantages thereof, and are not necessarily drawn to scale.
Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".
The oily sludge treatment process of the embodiment is as follows:
charging, injecting hot water, injecting a cleaning agent, forcibly stirring, overflowing and recovering a top floating sump oil component, screening solid impurities more than 10 millimeters, separating solid particles more than 0.1 millimeter, and centrifugally dehydrating.
To complete the above processing process, the flow of the apparatus used in this embodiment is shown in fig. 1, and includes: cleaning machine 1, rotary screen 2 and mud buffer tank 3.
Specifically, the charging step is to charge the oily sludge to be treated into a cleaning machine 1 through a charging machine, the structure of the cleaning machine 1 is shown as figure 2, the cleaning machine comprises a rectangular container with the volume of 4-10 cubic meters, and a mechanical stirring mechanism 1-2 is arranged at the bottom of an inner cavity of the container; the upper part of the container is provided with an oil collecting tank 1-1, and the bottom of the oil collecting tank 1-1 is provided with an oil outlet; the lower part of the container is provided with a discharge port 1-3.
According to the process steps, after the oily sludge is loaded into the cleaning machine 1, hot water and a cleaning agent are required to be injected into the cleaning machine 1, the hot water and the cleaning agent are used for cleaning dirty oil components in the oily sludge, the cleaning agent can be selected from cleaning agents commonly used in the field, and the embodiment has no special requirements.
In the cleaning process, a mechanical stirring mechanism 1-2 in the cleaning machine 1 stirs and mixes oily sludge, hot water and a cleaning agent to peel off dirty oil components in the oily sludge by the hot water and the cleaning agent, the peeled dirty oil components gradually float and accumulate on the upper part of the cleaning machine, water is slowly injected into the cleaning machine to lift the liquid level after cleaning is finished, the dirty oil floating at the top is automatically discharged through an oil collecting tank 1-1 and an oil discharge port, and then the dirty oil components are recovered to a dirty oil recovery tank through a pipeline or equipment. After the dirty oil component is discharged, the residual slurry component in the cleaning machine is discharged from the discharge port 1-3.
The mechanical stirring mechanism 1-2 can adopt equipment with the same function in the prior art, and preferably selects a horizontal double-shaft forced mechanical stirring mechanism, so that solid impurities such as color stripe cloth, woven bag fragments, labor protection articles, weeds, tile blocks and iron wires can be mixed and cleaned with oily sludge, and the solid impurities and the oily sludge can be efficiently stripped.
According to the above process requirements and as shown in fig. 1, the slurry components discharged from the discharge ports 1-3 of the cleaning machine 1 are first screened for solid impurities of more than 10 mm. For removing solid impurities with a size of more than 10 mm, the present embodiment uses a roller screen 2 device, and specifically, as shown in fig. 3, the roller screen 2 device includes a screen cylinder with a diameter of 1-2 m and a length of 4-6 m and a height of 15 cm and an internal spiral structure, a mesh on the screen cylinder has a diameter of 10 mm, and a mesh with a diameter of 10 mm can remove solid impurities with a size of more than 10 mm in slurry components. A belt conveyor belt is arranged at the end part of the screen drum and is used for conveying solid impurities in the screen drum to a specified recovery area; in addition, the roller screen also comprises a rolling ring, a screen cylinder support, a gear ring, a gear and a gearbox power transmission, which are used for supporting and driving the screen cylinder to rotate so as to screen out solid impurities in the slurry component.
The roller screen 2 is installed at the lower side of the cleaning machine 1 and above the slurry buffer tank 3, slurry components flowing out of a discharge port 1-3 at the bottom of the cleaning machine 1 directly flow into the roller screen 2, after passing through the roller screen 2, solid impurities larger than 10 mm in the slurry components are removed from the tail end of the roller screen 2 under the action of an internal screw, the solid impurities fall into a belt type conveying belt and are conveyed to a specified recovery area, and the components smaller than 10 mm fall into the slurry buffer tank 3.
After the slurry components pass through the roller screen 2, large-size solid impurities can be separated, so that the pumping process in the subsequent steps is facilitated, the oil content of the large-size solid impurities separated through the roller screen 2 can be controlled to be below 0.1%, and the requirement of environmental protection and discharge is met.
The composition entering the slurry buffer tank 3 comprises solid particles (such as silt particles) less than 10 mm but greater than 0.1 mm, and in fig. 4, the bottom of the slurry buffer tank 3 is provided with a screw conveying shaft 3-1 and a mud pump suction inlet 3-2, and the effective volume is 12-16 cubic meters. In fig. 5 and 6, a shale shaker 4 is arranged above the mud buffer tank 3, the processing capacity is 30 cubic meters per hour, and the minimum particle size of the screening is 0.1 mm; the shale shaker 4 is installed at the lower part of the roller screen 2 and is used for recovering and storing the components falling from the roller screen 2 and screening out solid particles smaller than 10 mm but larger than 0.1 mm in the components, the solid particles directly fall into the solid particle recovery tank 5 after coming out of the shale shaker 4, and the sewage components screened out of the solid particles fall into the mud buffer tank 3 and are conveyed to the mud pump through the spiral conveying shaft 3-1 at the bottom of the mud buffer tank and then conveyed to the high-speed centrifuge through the mud pump.
Because the solid particles with the particle size of more than 0.1 mm in the sewage are recovered, the solid-liquid separation workload of the high-speed centrifuge can be reduced, and the service life of the high-speed centrifuge is prolonged by reducing the high-speed friction of the silt with larger size.
The sewage separated by the high-speed centrifuge is further subjected to flocculation sedimentation air flotation treatment and then is heated by steam, and the heated sewage can participate in the treatment of the next batch of oily sludge, so that the cyclic utilization of the sewage is realized.
Summarizing the above process, the process action and effect of the present embodiment are as follows:
(1) mixing and cleaning: a large amount of sundries such as color stripe cloth, woven bag fragments, labor protection supplies, weeds, brick tiles, iron wires and the like are often doped in the oily sludge, and the large-size solid sundries and the oily sludge can be mixed and cleaned by the process, so that the aim of synchronously cleaning the large-size solid sundries is fulfilled.
(2) And (3) overflowing and recycling sump oil: after the cleaning is finished, the liquid level is improved by injecting water to recover the dirty oil floating on the upper part of the cleaning machine, and the recovery rate of the dirty oil is over 95 percent.
(3) Impurity separation: solid impurities with the size of more than 10 millimeters are separated by the roller screen (the size is adjusted according to the process requirement), and the efficiency of the slurry pump in the next procedure is facilitated.
(4) Separating smaller particles and impurities: after solid particle impurities with the particle size larger than 0.1 mm are recovered, the solid-liquid separation workload of the high-speed centrifuge is reduced, the mechanical abrasion is reduced by reducing the high-speed friction of large-size silt, and the service life of the high-speed centrifuge is prolonged.
In conclusion, the process and the equipment are simple, the investment is low, the efficiency is high, the stability is high, the treatment effect on oily sludge containing large-size solid impurities is good, the environment-friendly requirement is met, and the operation cost is controllable.
The above-mentioned embodiments are merely embodiments for expressing the invention, and the description is specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes, substitutions of equivalents, improvements and the like can be made without departing from the spirit of the invention, and these are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. The oily sludge treatment process is characterized by comprising the following steps:
chemically hot washing and stirring the oil-containing sludge to separate out a dirty oil component and a slurry component;
sequentially screening solid impurity components with the sizes above the technological requirements and solid particle components with the sizes above 0.1 mm from the slurry components to obtain sewage components;
respectively recovering the dirty oil component, the solid impurity component and the solid particle component;
and treating the sewage components for recycling.
2. The oily sludge treatment process according to claim 1, wherein:
the chemical hot washing and the stirring of the oily sludge are carried out in a cleaning machine;
the cleaning machine comprises a stirring container;
an oil collecting tank is arranged above the stirring container, and a discharge hole is arranged below the stirring container;
the oil collecting tank is provided with an oil outlet;
the dirty oil component overflows from the oil outlet and is discharged;
the slurry component is discharged from the discharge port.
3. The oily sludge treatment process according to claim 2, characterized in that:
the device for screening out the solid impurity components is a roller screen;
the discharge port of the cleaning machine corresponds to the feed port of the roller screen;
the screen drum of the roller screen is provided with an internal spiral structure;
the internal spiral structure is used for automatically conveying the solid impurity components to the tail end of the screen cylinder and discharging the solid impurity components from an outlet of the screen cylinder when the roller screen rolls;
the mesh specification of the screen cylinder meets the process requirement.
4. The oily sludge treatment process according to claim 3, wherein:
the equipment for screening out the solid particle component comprises a slurry buffer tank;
the slurry buffer groove receives materials falling from the meshes;
the mud buffer tank is connected with a mud pump;
the mud pump conveys the material to a mud vibrating screen;
the mud vibrating screen is used for screening the materials into the solid particle component and the sewage component.
5. The oily sludge treatment process according to claim 4, wherein:
a screw conveying mechanism is arranged between the slurry buffer tank and the slurry pump;
and the spiral conveying mechanism is used for conveying the material to a suction port of the mud pump.
6. The oily sludge treatment process as claimed in any one of claims 1 to 5, wherein:
the method for treating the sewage components comprises centrifugal treatment and/or flocculation sedimentation air floatation treatment and/or steam heating treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110414793.1A CN113060915A (en) | 2021-04-17 | 2021-04-17 | Oily sludge treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110414793.1A CN113060915A (en) | 2021-04-17 | 2021-04-17 | Oily sludge treatment process |
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| CN113060915A true CN113060915A (en) | 2021-07-02 |
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| CN202110414793.1A Pending CN113060915A (en) | 2021-04-17 | 2021-04-17 | Oily sludge treatment process |
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Application publication date: 20210702 |