CN112624566B - Dehydration process for high-water-content oil sludge - Google Patents
Dehydration process for high-water-content oil sludge Download PDFInfo
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- CN112624566B CN112624566B CN202011410940.XA CN202011410940A CN112624566B CN 112624566 B CN112624566 B CN 112624566B CN 202011410940 A CN202011410940 A CN 202011410940A CN 112624566 B CN112624566 B CN 112624566B
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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
- C02F11/15—Treatment of sludge; Devices therefor by de-watering, drying or thickening by treatment with electric, magnetic or electromagnetic fields; by treatment with ultrasonic waves
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
- Filtration Of Liquid (AREA)
- Electrostatic Separation (AREA)
Abstract
The invention discloses a high-water-content oil sludge dehydration process, which comprises the following steps of: (1) Firstly, removing part of water and solid impurities in the oil sludge through inclined plate sedimentation and filtration; (2) Then enters a sedimentation dehydration tank, and demulsifier is added into the tank; (3) the mixture enters an electric dehydration tank for treatment; (4) And finally, the water phase at the bottom of the electric dehydration tank is subjected to filter pressing or centrifugal separation to obtain solids. The demulsifier and the electric dehydration process are adopted, so that the moisture and ash in the high-water-content oil sludge can be removed to the greatest extent, and the oil can be recycled; meanwhile, the energy consumption can be reduced, and the secondary environmental pollution is reduced.
Description
Technical Field
The invention relates to a dehydration process of high-water-content oil sludge, in particular to a process for adding demulsifier to high-water-content oil sludge and electric dehydration.
Background
The crude oil water-containing fatlute is a stable colloidal system composed of organic matters such as petroleum, water, sediment and the like, wherein the organic matters contain a large amount of polycyclic aromatic hydrocarbon and harmful microorganisms besides heavy crude oil, residual oil and finished oil, and the organic matters contain a large amount of crude oil, microorganisms, heavy metals, benzene series and other toxic and harmful substances, so that the organic matters have great harm to human bodies and the environment, are listed as solid hazardous waste (HW 08) items in China, and can be discharged after being effectively treated and harmless. At present, the domestic existing method for treating the water-containing oil sludge is summarized as follows: incineration, coking, landfill, land cultivation, pyrolysis, solvent extraction, comprehensive utilization of oily sludge, solidification, chemical demulsification, biological treatment and the like. However, because the oil sludge contains a large amount of water and petroleum substances, the oil sludge is generally semi-solid or slurry, and the heavy component glue has large mass and large viscosity, and brings great inconvenience and environmental hazard to storage and transportation. In addition, the oil-containing wastewater in the bottom of the crude oil tank and the oil-containing wastewater in the cleaning of crude oil transportation equipment are difficult to remove the water in the oil in the form of conventional chemical demulsification sedimentation and the like due to high water content, high oil content, high ash content and large mass of heavy component glue. And the tank bottom sludge and the transportation equipment are cleaned to produce oily wastewater with too high water content, and the destructive distillation device is adopted to realize high energy consumption, so that the recovery of oil is difficult and the safety risk is high.
Disclosure of Invention
The present invention has been made in order to solve the above-mentioned problems, and has been verified in actual production by carrying out inventive work and numerous experiments, thereby providing a dehydration process for high water-containing sludge.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the high-water-content oil sludge dewatering process adopts the steps of sedimentation filtration, demulsification, electric dewatering and pressure filtration, wherein the electric dewatering step is that the oil sludge stays for 10-20 min, 10-30 min and 500-600 v at the voltage of 5-10 v and 20-50 min respectively after entering an electric dewatering device. Because the oil sludge raw material has high water content, a part of demulsification needs to be performed by using low voltage, and ionization can be directly formed when the voltage is too high. And then gradually increasing the voltage.
As a further improvement of the invention, the sedimentation filtration step is to send the high-water-content oil sludge to a sedimentation dehydration tank through inclined plate sedimentation filtration.
As a further improvement of the invention, the demulsification step is to add demulsifier to accelerate sedimentation and filtration when the high water content oil sludge is heated to 80-200 ℃.
Preferably, the demulsifier is PAM.
As a further improvement of the invention, the high-water-content oil sludge is subjected to electric dehydration and then is stood for delamination for 5-24 hours.
As a further improvement of the invention, the bottom wastewater and ash solids after standing and layering enter a filter pressing device to filter out solids.
As a further improvement of the invention, the filter press device is a plate-and-frame filter press, which forms a filter cake after filtering sewage, and the filter cake remains in the filter press for recovery.
As a further improvement of the invention, the upper oil phase after standing and layering is discharged into an oil tank.
As a further development of the invention, the tank inlet is provided with a filter.
As a further improvement of the invention, the wastewater generated in the process is intensively recycled.
The beneficial effects of the invention are as follows: the demulsifier and the electric dehydration process are adopted, so that the moisture and ash in the high-water-content oil sludge can be removed to the greatest extent, and the oil can be recycled; meanwhile, the energy consumption can be reduced, and the secondary environmental pollution is reduced. Experiments show that the water content of the oil sludge can be rapidly reduced to below 3%, and the ash content of the recovered oil phase can reach 0.5%.
Drawings
FIG. 1 is a block diagram of the process flow of the present invention.
Detailed Description
The invention will now be described in further detail with reference to fig. 1. The drawings are simplified schematic views illustrating the basic structure of the present invention by way of illustration only, and thus show only the constitution related to the present invention.
Example 1
As shown in fig. 1, embodiment 1 provides a working method of a filter pressing device, which includes the following steps:
(1) Firstly, high-water-content fatlute inclined plate sedimentation filtration is sent to a sedimentation dehydration tank, then the high-water-content fatlute inclined plate sedimentation dehydration tank is heated to 80 ℃ for sedimentation and filtration, and demulsifier PAM is added during sedimentation filtration to remove partial water and solid impurities in oil;
(2) Then the mixture enters an electric dehydration device, the voltage is kept between 5v and 10v for 10min, the voltage is kept between 200 and 350v for 10min, and the voltage is kept between 500 and 600v for 20min;
(3) Standing and layering for 5 hours, allowing wastewater and ash solids at the bottom of the device to enter a plate-and-frame filter press, and filtering out solids; the filter press device filters sewage to form a filter cake, and the filter cake is remained in the filter press for recycling;
(4) The upper oil phase is discharged into an oil tank, and a filter is arranged at the inlet of the oil tank;
and (5) the wastewater generated in the process is intensively recycled.
Through inspection, the water content of the recovered crude oil sludge is rapidly reduced to below 15%, the ash content is below 0.5%, and the treatment time is saved by 85% with the simple addition of a demulsifier or 35% with the simple electric dehydration treatment.
Example 2
As shown in fig. 1, embodiment 2 provides a working method of a filter pressing device, which includes the following steps:
(1) Firstly, high-water-content oil sludge is sent to a sedimentation dehydration tank through inclined plate sedimentation filtration, then is heated to 150 ℃ for sedimentation and filtration, and meanwhile demulsifier PAM is added for sedimentation filtration to remove partial water and solid impurities in the waste lubricating oil;
(2) Then the mixture enters an electric dehydration device, the voltage is kept for 20min at 5 v-10 v, 30min at 200-350 v and 50min at 500-600 v;
(3) Standing and layering for 8 hours, allowing wastewater and ash solids at the bottom of the device to enter a plate-and-frame filter press, filtering out the solids, filtering sewage by a filter pressing device to form a filter cake, and remaining in the filter press for recycling;
(4) The upper oil phase is discharged into an oil tank, and a filter is arranged at the inlet of the oil tank;
and (5) the wastewater generated in the process is intensively recycled.
Through inspection, the water content of the recovered crude oil sludge is quickly below 6%, the ash content is 0.5%, and the treatment time is saved by 90% with the simple addition of a demulsifier or 40% with the simple electric dehydration treatment.
Example 3
As shown in fig. 1, embodiment 1 provides a working method of a filter pressing device, which includes the following steps:
(1) Firstly, high-water-content fatlute inclined plate sedimentation filtration is sent to a sedimentation dehydration tank, then the high-water-content fatlute inclined plate sedimentation dehydration tank is heated to 200 ℃ for sedimentation and filtration, and demulsifier PAM is added during sedimentation filtration to remove partial water and solid impurities in oil;
(2) Then the mixture enters an electric dehydration device, the voltage is kept between 5v and 10v for 15min, the voltage is kept between 200 and 350v for 30min, and the voltage is kept between 500 and 600v for 40min;
(3) Standing and layering for 12 hours, allowing wastewater and ash solids at the bottom of the device to enter a plate-and-frame filter press, filtering out the solids, filtering sewage by a filter pressing device to form a filter cake, and remaining in the filter press for recycling;
(4) The upper oil phase is discharged into an oil tank, and a filter is arranged at the inlet of the oil tank;
and (5) the wastewater generated in the process is intensively recycled.
Through inspection, the water content of the recovered crude oil sludge is below 3%, the ash content is below 0.5%, and the treatment time is saved by 95% with the simple addition of a demulsifier or 35% with the simple electric dehydration treatment.
Example 4
As shown in fig. 1, embodiment 1 provides a working method of a filter pressing device, which includes the following steps:
(1) Firstly, high-water-content oil sludge is sent to a sedimentation dehydration tank through inclined plate sedimentation filtration, then is heated to 200 ℃ for sedimentation and filtration, and meanwhile demulsifier PAM is added for sedimentation filtration to remove partial water and solid impurities in the waste lubricating oil;
(2) Then the mixture enters an electric dehydration device, the voltage is kept for 20min at 5 v-10 v, 30min at 200-350 v and 50min at 500-600 v;
(3) Standing and layering for 24 hours, allowing wastewater and ash solids at the bottom of the device to enter a plate-and-frame filter press, filtering out the solids, filtering sewage by a filter pressing device to form a filter cake, and remaining in the filter press for recycling;
(4) The upper oil phase is discharged into an oil tank, and a filter is arranged at the inlet of the oil tank;
and (5) the wastewater generated in the process is intensively recycled.
Through inspection, the water content of the recovered crude oil sludge is below 3%, the ash content is 0.5%, and the treatment time of the recovered crude oil sludge is 85% compared with that of the crude oil sludge treated by simply adding a demulsifier or 51% compared with that of the crude oil sludge treated by simply electrically dewatering.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A dehydration process for high-water-content oil sludge is characterized in that: the high-water-content oil sludge dehydration process adopts the steps of sedimentation filtration, demulsification, electric dehydration and pressure filtration, wherein the electric dehydration step is that the oil sludge stays for 10-20 min, 200-350 v stays for 10-30 min and 500-600 v stays for 20-50 min respectively at the voltage of 5-10 v after entering an electric dehydration device.
2. The high water content sludge dewatering process as claimed in claim 1, wherein: the sedimentation filtration step is to send the high-water-content oil sludge to a sedimentation dehydration tank through inclined plate sedimentation filtration.
3. The high water content sludge dewatering process as claimed in claim 1, wherein: the demulsification step is to add demulsifier to accelerate sedimentation and filter when the high water content oil sludge is heated to 80-200 ℃.
4. The high water content sludge dewatering process as claimed in claim 1, wherein: and (3) standing and layering for 5-24 hours after the high-water-content oil sludge is electrically dehydrated.
5. The high water content sludge dewatering process as claimed in claim 4, wherein: and (3) enabling the bottom wastewater and ash solids subjected to standing delamination to enter a filter pressing device, and filtering out the solids.
6. The high water content sludge dewatering process as claimed in claim 5, wherein: the filter pressing device is a plate-and-frame filter press, a filter cake is formed after sewage is filtered, and the filter cake is remained in the filter press for recycling.
7. The high water content sludge dewatering process as claimed in claim 4, wherein: and discharging the upper oil phase subjected to standing delamination into an oil tank.
8. The high water content sludge dewatering process as claimed in claim 7, wherein: the inlet of the oil tank is provided with a filter.
9. The high water content sludge dewatering process as claimed in any one of claims 1-8, wherein: and (5) the wastewater generated in the process is intensively recycled.
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| CN202011410940.XA CN112624566B (en) | 2020-12-04 | 2020-12-04 | Dehydration process for high-water-content oil sludge |
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| CN202011410940.XA CN112624566B (en) | 2020-12-04 | 2020-12-04 | Dehydration process for high-water-content oil sludge |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2742439Y (en) * | 2004-09-27 | 2005-11-23 | 李国强 | Evaluation instrument for raw oil demulsifying agent |
| KR20060070073A (en) * | 2004-12-20 | 2006-06-23 | 재단법인 포항산업과학연구원 | Electrodewatering method for high efficiency of sludge dewatering |
| KR20130011540A (en) * | 2011-07-22 | 2013-01-30 | 박경득 | Dehydrator |
| CN103275751A (en) * | 2013-05-31 | 2013-09-04 | 成都易态科技有限公司 | Crude oil electric desalting method and electric desalting device |
| CN105505446A (en) * | 2014-09-26 | 2016-04-20 | 江苏三星能源装备有限公司 | Stepless voltage regulation electric desalination experimental instrument |
| CN107176775A (en) * | 2017-05-05 | 2017-09-19 | 郑旭东 | A kind of technological process for purifying oily sludge |
| CN108865218A (en) * | 2018-07-18 | 2018-11-23 | 铜仁学院 | A kind of chemical integrated equipment for wastewater treatment and method |
-
2020
- 2020-12-04 CN CN202011410940.XA patent/CN112624566B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2742439Y (en) * | 2004-09-27 | 2005-11-23 | 李国强 | Evaluation instrument for raw oil demulsifying agent |
| KR20060070073A (en) * | 2004-12-20 | 2006-06-23 | 재단법인 포항산업과학연구원 | Electrodewatering method for high efficiency of sludge dewatering |
| KR20130011540A (en) * | 2011-07-22 | 2013-01-30 | 박경득 | Dehydrator |
| CN103275751A (en) * | 2013-05-31 | 2013-09-04 | 成都易态科技有限公司 | Crude oil electric desalting method and electric desalting device |
| CN105505446A (en) * | 2014-09-26 | 2016-04-20 | 江苏三星能源装备有限公司 | Stepless voltage regulation electric desalination experimental instrument |
| CN107176775A (en) * | 2017-05-05 | 2017-09-19 | 郑旭东 | A kind of technological process for purifying oily sludge |
| CN108865218A (en) * | 2018-07-18 | 2018-11-23 | 铜仁学院 | A kind of chemical integrated equipment for wastewater treatment and method |
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Effective date of registration: 20230828 Address after: No. 2865 Canghai Road, Lingang New Area, China (Shanghai) Pilot Free Trade Zone, Pudong New Area, Shanghai, 200120 Applicant after: SHANGHAI TIANHAN ENVIRONMENTAL RESOURCES Co.,Ltd. Applicant after: Shanghai Conglin Environmental Protection Technology Co.,Ltd. Address before: 2865 Canghai Road, Nanhui new town, Pudong New Area, Shanghai, 201306 Applicant before: SHANGHAI TIANHAN ENVIRONMENTAL RESOURCES Co.,Ltd. |
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