CN107540107B - Deep oil-removing purification method for steam stripping purified water of oil refining - Google Patents
Deep oil-removing purification method for steam stripping purified water of oil refining Download PDFInfo
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Abstract
The invention belongs to the field of water treatment, and particularly relates to a deep oil removal purification method for steam stripping purified water in oil refining. The oil refining stripped and purified water is passed through a pottery sand filtering tower to remove dispersed oil and suspended matter with grain size greater than 10 microns, and then passed through a first-stage fiber membrane to retain and separate suspended oil and partial emulsified oil in the water and colloid and suspended matter with grain size greater than 1 micron, and finally passed through a second-stage fiber membrane to retain and separate emulsified oil and colloid and suspended matter with grain size greater than 0.1 micron. The treated stripped and purified water can be directly reused for various hydrogenation devices of an oil refinery as high-pressure air cooling water injection, so that the desalted water consumption can be saved, the production cost of the oil refinery can be reduced, the external discharge of sewage can be reduced, and considerable economic benefit and environmental benefit can be achieved.
Description
Technical Field
The invention belongs to the field of water treatment, and particularly relates to a deep oil removal purification method for steam stripping purified water in oil refining.
Background
The oil exists in water mainly in the form of oil-solid substance formed by floating oil, dispersed oil, emulsified oil, dissolved oil and oil particles attached to the surface of solid suspended matter. The high oil content in the discharged sewage can cause great harm to animals, plants, water and soil, and finally the living environment of human beings is affected. The oily sewage treatment process is mostly based on coagulation, sedimentation and filtration, and a gravity oil removal process, a pressure oil removal process, a flotation process, a coarse granulation method, a membrane separation method, a biochemical method and the like are adopted in China. These treatment methods have advantages and disadvantages, and the treatment effect is different for different water qualities. Generally, the single method is difficult to reach the emission standard and needs to be used in a combined way.
Xiaobo is in the text of the pilot test research on Wu-Steel Hot-rolled oily wastewater treated by modified fiber balls, and introduces the pilot test research result on the hot-rolled oily wastewater treated by the modified fiber ball filtering technology, wherein the pilot test device is continuously operated for 90 days, the effluent oil content after filtering is less than or equal to 5mg/L, and the suspended matter is less than 7 mg/L; the backwashing water flows back to the horizontal sedimentation tank for circular treatment, and test results show that the modified fiber ball is an excellent filtering material, has large sewage interception capacity and is easy to regenerate, and the water quality after treatment basically meets the requirements of production water.
Shamkhi uses a system called ORUW to treat refinery oily wastewater that removes oil from the water using sheep wool as a filter medium. The test result shows that the oil removal rate of the system reaches more than 99 percent, and compared with the conventional oily sewage treatment process, the system has high treatment efficiency and does not need pretreatment and post-treatment.
The result shows that the HPL plate-frame type ultrafilter can continuously concentrate oily sewage once by using the PSF ultrafiltration membrane under the conditions that the pressure is lower than 0.40MPa and the operating temperature is 45-50 ℃, the volume concentration is more than 20 times, and the oil content retention rate is more than 99%.
The KMS Spirapak membrane component is adopted by Qinghua university for ultrafiltration process, and can effectively treat sewage. Under proper conditions, the concentration multiple can reach 71, and the concentration of the treated oil is less than 30 mg/L; the COD concentration is 2000-2500mg/L, and the biodegradability can be greatly improved. Practice shows that the membrane technology is an oily sewage treatment method with great development potential, membranes are reasonably selected, the working conditions of the membranes are determined, the treatment capacity can be increased, the membrane pollution is reduced, and the oil removal rate is improved.
The above documents all introduce that a single process is adopted to treat oily sewage, and the treated object has certain limitations, poor impact resistance and easy fluctuation of effluent quality.
CN 101219836A discloses a system and a process for treating oily wastewater with high salt content. Comprises a precipitation device, a buffer device, an ultrafiltration device, a water collecting device and a reverse osmosis device; the method comprises the following steps: (1) adsorbing the oily sewage by a filter with a filter material of defatted walnut shells to remove most of oils and suspended matters; (2) separating the water treated by the filter by a hollow fiber internal pressure type ultrafiltration membrane to remove almost all oils and suspended matters; (3) and then the salt is removed by a reverse osmosis device of the roll type reverse osmosis membrane component. The sewage treated by the process can be reused in industrial production. The water treatment technology introduced by the patent is complex in process, walnut shells have oil immersion property, and adsorbed oil is difficult to desorb. Along with the prolonging of time, the treatment effect is obviously reduced, and the backwashing needs mechanical stirring or in-vitro scrubbing; the operation period of the filtration process and the ultrafiltration process is short (the filtration and ultrafiltration time is only 600min and 25min), the backwashing is frequent, and the control difficulty is large.
CN102949866A discloses a method for removing oil from olefin cracking emulsified chilled water, which adopts a combined process of demulsification sedimentation, coarse granulation filtration and interception oil removal to treat emulsified chilled water from an olefin cracking device, wherein the infrared oil removal rate can reach more than 80 percent, and for the chilled water with serious emulsification, the infrared oil of treated effluent is less than or equal to 200 mg/L. The method can separate oil from emulsified quenching water in time, and the deoiled quenching water is recycled, so that the stability and reliability of the operation of the olefin cracking device are improved, the operation period of the device is prolonged, the discharge amount of oil pollutants is reduced, and part of oil agent is recovered. The method is suitable for treating places with high emulsified oil content and low water outlet requirement, and has the advantages of low coarse graining, filtering and oil removing efficiency, short operation period and frequent back washing.
The steam stripping purified water for oil refining is softened water polluted by a small amount of pollutants such as petroleum and suspended solids, and the water quality is as follows: 1.15-14.4mg/L petroleum, 0.8-24.0mg/L suspended solid (S.S), 0.6-26.0NTU turbidity, 50-70 deg.C water temperature, and 7.6-9.4 pH. A large amount of purified sewage is directly discharged to a sewage treatment plant, which wastes water resources and increases sewage treatment cost. The main problems existing in the direct reuse of the heavy oil hydrogenation device as water injection are that adhesive substances are arranged on a mechanical sealing surface of a high-pressure water injection pump, so that the mechanical sealing is quickly worn and leaked; secondly, the screen (10 mu m) in front of the inlet of the high-pressure water injection pump is often blocked and needs to be cleaned every other day. Because the screen cloth is blocked, the water supply of the pump is insufficient, the sealing ring immediately heats, the temperature rises, and finally the mechanical seal fails.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a deep oil removal purification method for steam stripping purified water of oil refining, which enables the treated steam stripping purified water to be directly reused for various hydrogenation devices of an oil refinery to be used as high-pressure air cooling water injection, so that the use level of desalted water can be saved, the production cost of the oil refining device can be reduced, the external discharge of sewage can be reduced, and considerable economic benefit and environmental benefit can be achieved.
The invention relates to a deep oil removal purification method of oil refining steam stripping purified water, which is characterized in that the oil refining steam stripping purified water is filtered by a pottery sand filter tower to remove dispersed oil and suspended matters with the grain diameter larger than 10 mu m, enters a first-stage fiber membrane to intercept and separate suspended oil and partial emulsified oil in the water and colloid and suspended matters with the grain diameter larger than 1 mu m, and finally enters a second-stage fiber membrane to intercept and separate the emulsified oil and colloid and suspended matters with the grain diameter larger than 0.1 mu m.
Wherein:
the precision of the primary fiber membrane is 1 mu m; the secondary fiber film precision was 0.1 μm.
The pottery sand filter tower is made of stainless steel with the specification of phi 320 multiplied by 1500mm, ceramic sand filter materials are filled in the pottery sand filter tower, and the height of a bed layer is 800 mm.
The pottery sand filtering tower is filled with pottery sand filtering materials, and the physical and chemical indexes of the pottery sand filtering materials are as follows: appearance: similar spherical, brown, interconnected micropores in the granules, effective grain diameter of 1.1mm, volume weight of 0.75g.cm-3Apparent density of 1.4g.cm-3The crushing strength is more than or equal to 8MPa, the breaking rate is less than or equal to 0.02 percent, the wear rate is less than or equal to 2 percent, the hydrochloric acid solubility is less than or equal to 0.2 percent, and the specific surface area is 4 multiplied by 104cm2.g-1The inner porosity is more than or equal to 30 percent, the ceramic sand filter material is a commercial product, but the types of the commercial ceramic sand filter materials are many, the ceramic sand filter material which meets the physicochemical indexes is selected, the ceramic sand filter material is a sphere-like object with a rough surface, micropores are filled in the ceramic sand during the processing process of the ceramic sand, and the adsorption of the ceramic sand filter material on oil and suspended matters is facilitated. Because the micropores in the granules are communicated with each other to form open macropores, the desorption is facilitated, the backwashing regeneration is thorough, and the service life is long.
The technological parameters of the ceramic sand filter tower are as follows: the filtration rate is 5-10m.h-1Preferably 6 to 8m.h-1The filtration period is 17-26h, preferably 22-24 h.
The pH value of inlet water of the ceramic sand filter tower is 7.7-9.1, the petroleum is 11.9-13.1mg/L, S.S (suspended substance) is 5.3-17.9mg/L, and the turbidity is 8.9-23.5 NTU. The pH value of the effluent is 7.6-8.9, the petroleum is 5.2-7.9mg/L, the S.S is 3.8-10.4mg/L, and the turbidity is 6.3-17.4 NTU.
Backwashing of the ceramic sand filter tower is carried out by adopting a method of air scrubbing, air-water combined backwashing and water washing, and parameters are controlled as follows: strength of scrubbing by compressed air 30L(s)-1.m-2) Scrubbing for 5 min; compressed air/industrial water vapor water combinationWashing and backwashing Strength 15.5/4.1L(s)-1.m-2) Backwashing for 5min by air-water combined washing; washing strength of industrial water of 6.2L(s)-1.m-2) And washing with water for 5 min.
The first-stage fiber membrane is filled in the first-stage fiber membrane oil removal filter, the phi 80X 1016HK fiber tubular membrane is filled in the first-stage fiber membrane oil removal filter, and the operation process parameters are as follows: surface load of 9.5-12.5L/h.dm2Preferably 10.0-12.0L/h.dm2The sewage discharge period is 40-52h, preferably 45-50h, the sewage discharge time is 8-12min, preferably 9-10min, and the sewage discharge amount is 50L.
The effluent of the first-stage fiber membrane oil removal filter is generally pH 7.5-8.7, petroleum 2.7-4.1mg/L, S.S 2.2-5.9mg/L and turbidity 1.3-3.4 NTU.
The secondary fiber membrane is filled in the secondary fiber membrane oil removal filter, the diameter of the secondary fiber membrane oil removal filter is 65 x 1016HK fiber tubular membranes, and the operation process parameters are as follows: surface load of 11.5-15.5L/h.dm2Preferably 12.0-14.5L/h.dm2The sewage discharge period is 40-52h, preferably 45-50h, the sewage discharge time is 8-12min, preferably 9-10min, and the sewage discharge amount is 50L.
The effluent of the secondary fiber membrane oil removal filter is generally pH 7.5-8.5, petroleum 0.5-2.0mg/L, S.S 0.5-1.8mg/L and turbidity 0.2-1.8 NTU.
As a preferred technical scheme, the invention relates to a deep deoiling purification method of steam stripping purified water for oil refining, the steam stripping purified water from a steam stripping device for oil refining firstly enters a water storage tank and then is sent into a ceramic sand filter tower from the upper part by a water inlet pump, and dispersed oil and suspended matters with the grain diameter larger than 10 mu m are removed through the adsorption and agglomeration action of a ceramic sand filter material; the effluent at the bottom of the filtering tower enters a primary fiber membrane oil removal filter, the first-stage precision is 1 mu m, suspended oil and part of emulsified oil with larger granularity in separated water and colloid and suspended matters with the granularity larger than 1 mu m are intercepted by the primary fiber membrane oil removal filter, and meanwhile, the primary oil removal device is also used for protecting the second stage. The first-stage effluent enters a second-stage fiber membrane oil removal filter, the second-stage precision is 0.1 mu m, and emulsified oil and colloid and suspended matters with the granularity larger than 0.1 mu m in the water are intercepted and separated. After being treated by a ceramic sand filtration and two-stage fiber membrane oil removal device, the steam stripping purified water of oil refining is subjected to deep oil removal and purification, the water quality of the effluent can reach the technical indexes that the petroleum is less than or equal to 2.2mg/L, SS is less than or equal to 2mg/L, turbidity is less than or equal to 2NTU, pH is 7.5-8.5, and water temperature is less than or equal to 45 ℃, and the requirement of water injection of various hydrogenation devices of a refinery can be met. The ceramic sand filter tower runs for 24 hours and needs backwashing. In the operation process, the fiber membrane oil removal filter does not need regular membrane cleaning, but regular pollution discharge is needed, the pollution discharge period is 48 hours, the pollution discharge time is 9-10min, and the water consumption of the device is less than 1%.
In summary, the invention has the following advantages:
(1) the invention develops a combined process of ceramic sand filtration and two-stage fiber membrane blocking and oil removing to treat stripped and purified water of an oil refinery, the investment is low, the operation cost is low, and the water quality after treatment reaches the following indexes: the petroleum is less than or equal to 2.2 mg/L; S.S (suspended matter) is less than or equal to 2 mg/L; the turbidity is less than or equal to 2NTU, and the water quality requirement of water injection of each hydrogenation device in a refinery can be met. The process is reasonable and feasible in technology, saves the consumption of demineralized water, reduces the production cost of the oil refining device, can reduce the external discharge of sewage, and has considerable economic and social benefits.
(2) According to the invention, the steam stripping purified effluent of oil refining is filtered and treated by ceramic sand, the removal rate of petroleum and suspended matters is close to 50%, and the stable operation of a subsequent oil removal device can be ensured; the oil removal rate of the two-stage fiber membrane interception reaches 80 percent. The combined process has a total oil removal rate of about 90%.
(3) The process of the invention is stable in operation, the fiber membrane interception oil removal device can stably operate under the condition of higher water temperature (less than or equal to 80 ℃), and the fiber membrane interception oil removal device has outstanding oil impact resistance. The operation cost is low, the specific hydraulic conditions in the membrane can ensure that the hydraulic flushing is realized on the surface of the membrane in normal operation, complex back flushing and regeneration system equipment are not needed, and a medicament is not needed to be added. The oil removal device can adopt fiber membrane units with different precision grades to block oil substances with different particle sizes, thereby realizing quantitative control of oil removal precision.
(4) The treated stripped and purified water can be directly reused for various hydrogenation devices of an oil refinery as high-pressure air cooling water injection, so that the desalted water consumption can be saved, the production cost of the oil refinery can be reduced, the external discharge of sewage can be reduced, and considerable economic benefit and environmental benefit can be achieved.
Drawings
FIG. 1 is a device used in the deep oil removal purification method of oil refining stripped purified water according to the embodiment 1 of the invention;
1. the device comprises a water storage tank, 2, a water inlet pump, 3, a water inlet flow meter, 4, a ceramic sand filter tower, 5, a ceramic sand filter material bed layer, 6, a backwashing air inlet pipeline, 7, a backwashing water inlet pipeline, 8, a backwashing water outlet pipeline, 9, a primary fiber membrane oil removal filter, 10, a fiber membrane material, 11, an oil discharge and sewage discharge pipeline, 12, a secondary fiber membrane oil removal filter, 13 and a water outlet pipeline.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
As shown in fig. 1, the device used in the deep oil removal purification method of oil refining stripping purified water comprises a water storage tank 1, which is connected with a water inlet pump 2, a water inlet flow meter 3, a ceramic sand filter tower 4, a primary fiber membrane oil removal filter 9 and a secondary fiber membrane oil removal filter 12 in sequence through pipelines. Wherein, a ceramic sand filter material bed layer 5 is arranged in the ceramic sand filter tower 4, the bottom part is connected with a backwashing water inlet pipeline 7 and a backwashing air inlet pipeline 6, and the upper part is connected with a backwashing water outlet pipeline 8; the HK fiber membrane materials 10 with different precisions and specifications are respectively arranged in the primary fiber membrane oil removing filter 9 and the secondary fiber membrane oil removing filter 12, and the upper parts of the HK fiber membrane materials are respectively connected with an oil discharge and sewage discharge pipeline 11; the total effluent of the combined process is sent to the water storage tank 1 through the water outlet pipeline 13 for reuse.
When the device is operated, the stripping and purifying water from the oil refining stripping device firstly enters a water storage tank 1 and then is sent into a ceramic sand filter tower 4 from the upper part by a water inlet pump 2; the effluent from the bottom of the ceramic sand filter tower 4 enters a first-stage fiber membrane oil removal filter 9. The primary effluent enters a secondary fiber membrane oil removal filter 12. After the treatment of the combined process of ceramic sand filtration and two-stage fiber membrane oil removal filter, the oil refining stripped and purified water is deeply subjected to oil removal and purification, and the water quality of the effluent can meet the requirement of water injection of various hydrogenation devices in a refinery. The ceramic sand filter tower runs for 24 hours and needs backwashing. In the operation process, the fiber membrane oil removal filter does not need regular membrane cleaning, but regular pollution discharge is needed, the pollution discharge period is 48 hours, and the pollution discharge time is 9-10 min.
The water quality of the effluent of a stripping device of an oil refinery of a petrochemical enterprise is determined as follows: 1.15-14.4mg/L petroleum, 0.8-24.0mg/L suspended solid (S.S), 0.6-26.0NTU turbidity, 50-70 deg.C water temperature, and 7.6-9.4 pH.
The experimental raw water firstly enters a pottery sand filter tower, and the filtering speed of the pottery sand filter tower is 8m.h-1(ii) a Filtration cycle 24 h. The inlet water of the ceramic sand filter is 12.1mg/L of petroleum, the suspended solid (S.S) is 15.8mg/L, the turbidity is 23.5NTU, the water temperature is 65 ℃, and the pH value is 8.6. The pH of the effluent of the filtration tower is 8.4, the petroleum content is 7.1mg/L, the S.S8.3mg/L and the turbidity is 16.2 NTU. Backwashing compressed air scrubbing strength of pottery sand filter tower is 30L(s)-1.m-2) Scrubbing for 5 min; backwashing strength of compressed air/industrial water-gas-water combined washing 15.5/4.1L(s)-1.m-2) Backwashing for 5min by air-water combined washing; washing strength of industrial water of 6.2L(s)-1.m-2) And washing with water for 5 min. The effluent of the ceramic sand filter tower enters a primary fiber membrane oil removal filter, and the primary fiber membrane oil removal filter has surface load: 11.0L/h.dm2(ii) a The sewage discharge period is 48 h; the sewage discharge time is 10 min; the sewage discharge capacity is 50L. The effluent pH8.1, petroleum 3.9mg/L, S.S 4.5mg/L, turbidity 3.1 NTU. The effluent of the first-stage fiber membrane oil removal filter enters a second-stage fiber membrane oil removal filter again, and the second-stage fiber membrane oil removal filter has surface load: 13.0L/h.dm2(ii) a The sewage discharge period is 48 h; the sewage discharge time is 10 min; the sewage discharge capacity is 50L. The final effluent pH of the combined process is 7.9, the petroleum is 1.8mg/L, the S.S. is 1.6mg/L, and the turbidity is 1.5 NTU.
Example 2
The water quality of the effluent of a stripping device of an oil refinery of a petrochemical enterprise is determined as follows: 12.2mg/L petroleum, 19.4mg/L suspended solid (S.S), 20.9NTU turbidity, 63 ℃ water temperature, and 8.6 pH. Filtering speed of pottery sand filtering tower 8m.h-1(ii) a Filtration cycle 24 h. The surface load of the first-stage fiber membrane oil removal filter is 11.2L/h.dm2(ii) a The sewage discharge period is 48 h; the sewage discharge time is 10 min; the sewage discharge capacity is 50L. Surface load of secondary fiber membrane oil removal filter is 14.5L/h.dm2(ii) a The pollution discharge period is 50 h; the sewage discharge time is 10 min; the sewage discharge capacity is 50L. Other processes and parameters are the same as those in example 1, the effluent pH is 8.2, the petroleum is 1.2mg/L, the S.S is 1.6mg/L, and the turbidity is 1.5 NTU.
Example 3
The water quality of the effluent of a stripping device of an oil refinery of a petrochemical enterprise is determined as follows: petroleum 13.8mg/L, suspended solid (S.S)20.4mg/L, turbidity 22.6NTU, water temperature 62 deg.C, pH 8.7. Filtering speed of pottery sand filtering tower 7m.h-1(ii) a Filtration cycle 24 h. The surface load of the first-stage fiber membrane oil removal filter is 11.5L/h.dm2(ii) a The sewage discharge period is 48 h; the sewage discharge time is 10 min; the sewage discharge capacity is 50L. The surface load of the secondary fiber membrane oil removal filter is 12.5L/h.dm2(ii) a The sewage discharge period is 48 h; the sewage discharge time is 10 min; the sewage discharge capacity is 50L. Other processes and parameters are the same as example 1, the effluent pH is 8.3, the petroleum is 1.5mg/L, the S.S is 1.7mg/L, and the turbidity is 1.6 NTU.
Example 4
Example 4 is an example of a primary impact test, wherein the impact test mainly simulates and examines the treatment capacity of the process of the invention on petroleum pollutants when an upstream process device is abnormally operated, backwashing drainage of a filter tower is periodically used as inflow water of the impact test in the test process, and the impact resistance of the device is tested. The quality of inlet water of the ceramic sand filter tower is 47.7mg/L of petroleum, 36.8mg/L of suspended solid (S.S), 29.6NTU of turbidity and 8.4 of pH. Filtering speed of pottery sand filtering tower 6m.h-1(ii) a Filtration cycle 26 h. The pH of the effluent of the filtration tower is 8.4, the petroleum content is 12.8mg/L, the S.S15.3mg/L and the turbidity is 19.2 NTU. Backwashing compressed air scrubbing strength of pottery sand filter tower is 30L(s)-1.m-2) Scrubbing for 5 min; backwashing strength of compressed air/industrial water-gas-water combined washing 15.5/4.1L(s)-1.m-2) Backwashing for 5min by air-water combined washing; washing strength of industrial water of 6.2L(s)-1.m-2) And washing with water for 5 min. The effluent of the ceramic sand filter tower enters a primary fiber membrane oil removal filter, and the primary fiber membrane oil removal filter has surface load: 10.0L/h.dm2(ii) a The sewage discharge period is 48 h; the sewage discharge time is 9 min; the sewage discharge capacity is 50L. The effluent petroleum is 7.7mg/L, S.S is 6.2mg/L, turbidity is 5.1NTU, and pH is 8.1. The effluent of the first-stage fiber membrane oil removal filter enters a second-stage fiber membrane oil removal filter again, and the second-stage fiber membrane oil removal filter has surface load: 12.0L/h.dm2(ii) a The sewage discharge period is 48 h; the sewage discharge time is 10 min; the sewage discharge capacity is 50L. The final effluent petroleum products of the combined process are 2.2mg/L, S.S 1.8mg/L and turbidity 1.9NTU，pH 8.0。
Claims (3)
1. A deep oil removal purification method for steam stripping purified water of oil refining is characterized in that: removing dispersed oil and suspended matters with the particle size larger than 10 mu m from the steam stripping and purifying water of oil refining by a ceramic sand filter tower, intercepting and separating suspended oil and partial emulsified oil in the water and colloid and suspended matters with the particle size larger than 1 mu m by a first-stage fiber membrane, and intercepting and separating the emulsified oil and colloid and suspended matters with the particle size larger than 0.1 mu m by a second-stage fiber membrane;
backwashing of the ceramic sand filter tower is carried out by adopting a method of air scrubbing, air-water combined backwashing and water washing, and parameters are controlled as follows: strength of compressed air scrubbing 30L(s)-1·m-2) Scrubbing for 5 min; compressed air/industrial water-air combined washing backwashing strength of 15.5/4.1L(s)-1·m-2) Backwashing for 5min by air-water combined washing; washing strength of industrial water of 6.2L(s)-1·m-2) Washing with water for 5 min;
the pottery sand filtering tower is filled with pottery sand filtering materials, and the physical and chemical indexes of the pottery sand filtering materials are as follows: effective particle diameter of 1.1mm and volume weight of 0.75g cm-3And an apparent density of 1.4 g/cm-3The crushing strength is more than or equal to 8MPa, the breaking rate is less than or equal to 0.02 percent, the wear rate is less than or equal to 2 percent, the hydrochloric acid solubility is less than or equal to 0.2 percent, and the specific surface area is 4 multiplied by 104cm2·g-1The internal porosity is more than or equal to 30 percent;
the technological parameters of the ceramic sand filter tower are as follows: the filtration speed is 5-10m.h-1The filtration period is 17-26 h;
the first-stage fiber membrane is filled in the first-stage fiber membrane oil removal filter, the phi 80X 1016HK fiber tubular membrane is filled in the first-stage fiber membrane oil removal filter, and the operation process parameters are as follows: surface load is 9.5-12.5L/(h.dm)2) The sewage discharge period is 40-52h, the sewage discharge time is 8-12min, and the sewage discharge capacity is 50L;
the secondary fiber membrane is filled in the secondary fiber membrane oil removal filter, the diameter of the secondary fiber membrane oil removal filter is 65 x 1016HK fiber tubular membranes, and the operation process parameters are as follows: surface load is 11.5-15.5L/(h.dm)2) The sewage discharge period is 40-52h, the sewage discharge time is 8-12min, and the sewage discharge capacity is 50L;
the precision of the primary fiber membrane is 1 mu m; the secondary fiber film precision was 0.1 μm.
2. The method for deeply deoiling and purifying refinery stripped and purified water according to claim 1, characterized in that: the pottery sand filter tower is made of stainless steel with the specification of phi 320 multiplied by 1500mm, ceramic sand filter materials are filled in the pottery sand filter tower, and the height of a bed layer is 800 mm.
3. The method for deeply deoiling and purifying refinery stripped and purified water according to claim 1, characterized in that: the pH value of inlet water of the ceramic sand filter tower is 7.7-9.1, the petroleum is 11.9-13.1mg/L, the S.S is 5.3-17.9mg/L, and the turbidity is 8.9-23.5 NTU.
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| CN102949866A (en) * | 2011-08-31 | 2013-03-06 | 中国石油化工股份有限公司 | Oil removal method for petrochemical emulsified process water |
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