CN103043746B - Degreasing method for super heavy oil wastewater - Google Patents
Degreasing method for super heavy oil wastewater Download PDFInfo
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Abstract
The invention relates to a method for removing oil stain from super heavy oil wastewater; the degreasing of the super heavy oil wastewater adopts a circulation foam separation tower consisting of a bubbling section and a foam section, and the degreasing method adopts batch operation or continuous operation; pumping the wastewater into a bubbling section of a circular flow foam separation tower, feeding sodium hydroxide or 0.1M hydrochloric acid with the mass concentration of 20%, adjusting the pH to 8-9, introducing air from a gas distributor, controlling the air speed of an air flow empty tower to be 0.5-1.5 cm/s, feeding a demulsifier aqueous solution, wherein the preparation volume concentration of the aqueous solution is 5-15% of the saturated concentration, and the feeding amount is 0.1-0.5% of the volume of the bubbling section per hour; starting an oil scraper by floating oil, collecting the floating oil from an oil residue discharge port at the bottom of the foam section, discharging the waste water after removing the emulsified oil from a liquid discharge port at the bottom of the bubbling section, and finishing a batch of operation when the removal rate of the emulsified oil reaches more than 90%; the one-time separation rate of the heavy emulsified oil can reach more than 90%.
Description
Technical field
The present invention relates to refine oil processing waste water deoiling method, definite saying relates to the separation method that removes heavy emulsified oil from crude oil processing waste water.
Background technology
Ultra-thick oil waste water sludge containing amount is high, and mineral oil proportion and water approach, its former oil particles is suspended in water for a long time, in addition, also contains a large amount of synthetic class organic high molecular compounds and natural macromolecular amount pitch, colloidal substance in waste water, make the disperse phase in waste water and external phase under action of gravity be difficult for layering, this waste water ph is 7.79, weakly alkaline, brown, thickness, be milk sap stable existence, hard degradation.
The super viscous crude course of processing can produce the waste water that contains in a large number heavy emulsified oil, comprise Bottom Plate of Crude Oil Storage dehydration, desalination decalcification sewage, the coking water of condensation etc. that steams out greatly, this water is compared with common refinery water, oil field waste, its outstanding feature is: 1. oil in water emulsion content is high: generally, oil over half in super viscous crude processing waste water exists with oil in water emulsion form, remove after oil slick and dispersed oil, more than 80% COD is due to oil in water emulsion and colloidal suspension deposits yields; 2. emulsification degree is serious, emulsion droplet is stable: the emulsion droplet diameter of heavy emulsified oil only has hundreds of nanometer conventionally to several microns, owing to existing a large amount of interface active agents of introducing in oil recovery process and a large amount of colloids, bitum suspended substance in waste water, make emulsion droplet highly stable; 3. oil in water emulsion viscosity is large: super viscosity of thickened oil is large, and its kinematic viscosity of 100 ℃ can reach 100mm
2more than/s, high viscosity makes emulsion droplet interface extremely stable, and mobility variation causes emulsion droplet to be difficult for coalescence and absorption; 4. oil in water emulsion density is large: super viscous crude density and water approach, therefore very low by the efficiency of the separated profit of sedimentation method, even if oil in water emulsion and water separating effect after flocculation are still poor.
Because heavy emulsified oil content is high, and be difficult to be biodegradable, therefore, before entering biochemical treatment, must first adopt the method for physics and chemistry to carry out pre-treatment, and pretreated core link remove floating carburetion exactly.At present, remove floating carburetting method and comprise absorption, extraction, flocculating settling, air supporting, membrane sepn etc., wherein flocculating settling and air-float method are more common, because super viscous crude density is high, viscosity is large, oil in water emulsion after flocculation is separated bad, the settlement separate time is long, efficiency is low, thereby it is very undesirable to adopt above-mentioned single method to carry out heavy emulsified oil removal effect; If after flocculating settling separation, further adopt the not settlement separate oil in water emulsion of dissolved air flotation, there is again process complexity, the high defect of energy consumption.If employing water quality and quantity adjusting-breaking milk and removing oil-eddy flow oily water separation-floatation purification technique of the report in the 4th phase < < oil Refining Technologies in 2007 and engineering > > " For Super Viscous Crude Refinery Wastewater pretreatment technology and engineering practice " such as Chen Chunmao is to the pretreated method of extremely-viscous crude sewage.
Because emulsification degree is high, emulsion droplet is very little and extremely stable, and stable oil droplet is very little in the adsorptive capacity at bubble interface, therefore need a large amount of bubble interfacial adsorption emulsion droplets, need multistage air supporting to reach the separating effect needing, thereby cause that dissolved air flotation energy consumption is high and separation efficiency is low, the disclosed a kind of heavy crude sewerage jet flow dissolved air flotation process of CN101327966 for example, comprises the stage trapping technology of an air supporting, injecting dissolve gas, secondary air supporting etc.
In recent years, some new efficient air-floating separating device and technology are in the news, cyclone floatation separating technology as disclosed in US2008/0006588, the method and apparatus of the disclosed pressurized dissolved air flotation hydrocyclone of CN 1546196 oily water separation, it adopts air supporting de-oiling and cyclonic separation combination to carry out de-oiling to oily(waste)water feed liquid, and above-mentioned document is the separating effect to heavy emulsifiable oil waste water less than report all.
US 5897772 discloses a kind of multi-stage circulating foam separating tower etc.Multi-stage circulating foam separating tower is a kind of air-flotation separation equipment of developing on loop reactor basis.Because the efficiency of dissolved air flotation depends on that bubble and external phase are fully, contact fast to a great extent, compare with general airfloat equipment, the quick turbulence of bubble in loop reactor, gas-to-liquid contact is abundant, can make separated material be enriched on foam surface faster, thereby can significantly improve the efficiency of foam separation, for size, the oil in water emulsion more than 10 μ m has higher separation efficiency to this technology, but the mink cell focus emulsion droplet less to particle diameter, interface motion is poor, separation efficiency is still lower.
CN1435275A discloses a kind of multi-stage circular flow reactor on traditional bubbling style reactor basis, tower is built-in with guide shell, guide shell bottom is provided with gas distributor, and this reactor can be widely used in the middle of all kinds of solution-airs such as oxidizing reaction, fermenting process, hydrocarbon processing reaction and active sludge sewage treatment process or gas-liquid-solid chemical reaction process.
Existing multi-stage circular flow reactor has following defect for oily(waste)water air supporting test: by bubbling, oily water separation, contain a certain amount of water in foam, approximately produced so the more unmanageable waste water of original waste water 10% left and right when processing waste water; Its Surfactant has requirements at the higher level simultaneously, should produce a large amount of foams, makes again oily water separation.
Summary of the invention
The object of the present invention is to provide a kind of kinematic viscosity of 100 ℃ of air-floatation processing device for emulsified oil sewage separation removals of utilizing to reach 100mm
2the method of oil in water emulsion in super viscous crude crude oil processing waste water more than/s.It is on the basis of multi-stage circulating foam separating tower and loop reactor and multi-stage circular flow reactor, the emulsified heavy oil droplet for emulsion droplet below 10 μ m, the method for a kind of breakdown of emulsion-circulation air supporting-frizing separating treatment oil in water emulsion providing.The method can improve oil in water emulsion separation efficiency, simplifies separation process.
The present invention is achieved through the following technical solutions:
Degreasing of ultra-thick oil waste water adopts the circling and bubbling separation column consisting of bubbling segment and foam section, and bottom bubbling segment is gas lift type common loop reactor, the gas-liquid separator that top foam section is overflow groove type; Oil wiper is equipped with at overflow groove top.
The method that degreases adopts batch formula operation or operate continuously; Wherein:
The formula of criticizing operation: the disposable air-floatation processing device for emulsified oil sewage bubbling segment that pumps into of waste water, liquid level is not less than edge on guide shell, slowly stream adds 20% sodium hydroxide or 0.1M hydrochloric acid, regulating pH is 8～9, from gas distributor, pass into air, air flow guarantees that empty tower gas velocity is 0.5～1.5cm/s, and it is saturation concentration 5%～15% that slow stream adds this aqueous solution compound concentration of the emulsion splitter aqueous solution, and stream dosage is 0.1～0.5% of bubbling segment volume per hour; After oil slick produces, start oil wiper, start to collect oil slick from the dregs of fat relief outlet 6 of foam section bottom simultaneously, from bubbling segment bottom leakage fluid dram 3, discharge and remove the waste water oil in water emulsion, after the decreasing ratio of oil in water emulsion reaches more than 90%, complete the operation of batch.
Operate continuously: pass into air in air-floatation processing device for emulsified oil sewage, guarantee that empty tower gas velocity is 0.5～1.5cm/s, the in advance slow stream of waste water adds 20% sodium hydroxide or 0.1M hydrochloric acid, regulating pH is 8～9, then to pump into the bubbling segment of air-floatation processing device for emulsified oil sewage by pump 12, hydraulic detention time is 0.5～2h, and feeding rate is 0.5～2 times of bubbling segment volume per hour, and opening for feed can be in the optional position of bubbling segment; Emulsion splitter is configured to the certain density aqueous solution, and this aqueous solution compound concentration is saturation concentration 5%～15%, is stored in storage tank 9, with volume pump 8, with constant rate of speed stream, is added to bubbling segment optional position, and stream dosage is 0.1～0.5% of bubbling segment volume per hour; After oil slick produces, start Oil scraper, from dregs of fat relief outlet 6, collect continuously oil in water emulsion; From bubbling segment bottom leakage fluid dram 3, discharge and remove the waste water oil in water emulsion, in whole operating process, guarantee that in tower, liquid amount is constant.
Described waste water be contain the heavy emulsified oil that in super viscous crude Crude Oil Processing, generation contains waste water emulsion droplet within the scope of 2～10 μ m, the COD that oil in water emulsion produces accounts for 75%～95% of the total COD of waste water, includes but not limited to oil tank bottom dehydration, desalination decalcification sewage, oil field extremely-viscous crude sewage, the coking water of condensation that steams out greatly.
Described emulsion splitter is by one or more combination of polyether demulsification agent, CAPG, fatty amines emulsion splitter etc.Consumption is: 0.02～0.1mmol/g COD.
Described polyether demulsification agent, quality index is: 100 ℃ of kinematic viscosity >=10mm2/s, acid number 50-70mgKOH/g, density (20 ℃) 850-950Kg/m3, flash-point (opening) >=105 ℃.
Described CAPG emulsion splitter, quality index is: solid content 50 ± 2%, pH value 7 ± 1.
Described fatty amines emulsion splitter, quality index is: hydroxyl value≤50mgKOH/g, colourity≤300APHA.
The described amount that passes into air is: maintenance empty tower gas velocity is 0.5～1.5cm/s;
Described oil wiper adopts the commercially available Oil scraper of coupling, and Oil scraper is board-like or belt.For board-like Oil scraper, scraper plate length is 1: 1 with circling and bubbling separation column bubbling segment diameter ratio; For belt Oil scraper, bandwidth is 0.7: 1 with circling and bubbling separation column bubbling segment diameter ratio.
In advantage of the present invention and beneficial effect, be:
Separation efficiency is high: the flash liberation rate of heavy emulsified oil can reach more than 90%;
Technological process is simple: waste water once, by circling and bubbling separation column, can be realized oil in water emulsion, and the sewage after de-oiling can directly carry out biochemical treatment, makes treatment process and the process simplification of heavy crude processing waste water;
After wastewater treatment, yield is high: Surfactant of the present invention is less demanding, and owing to not having too much foam to produce, the oil slick of generation is removed by Oil scraper, and the yield after wastewater treatment is brought up to more than 98% by 90% left and right.Do not produce secondary sewage.
Accompanying drawing explanation
Fig. 1 is the structure iron of circling and bubbling separation column.Wherein:
Fig. 2 is the continuous operation process schema of breakdown of emulsion-fluid circling bubbling separation waste water treatment heavy emulsified oil in wastewater.
Wherein: 1-bubbling segment 2-foam section, 3-leakage fluid dram, 4-gas distributor, the guide shell of 5-loop reactor, 6-dregs of fat relief outlet, 7-air pressure pump, 8-volume pump, 9-emulsion splitter solution storage tank, 10-wastewater storage tank, 11-oil wiper, 12-volume pump, 13 overflow weirs
Embodiment
The treatment unit that degreases of this ultra-thick oil waste water is a kind of circling and bubbling separation column, bottom bubbling segment 1 and top foam section 2, consists of.
The foam section 2 on top is overflow groove type gas-liquid separator, and it comprises overflow weir 13, oil wiper 11 and dregs of fat relief outlet 6, and oil wiper 11 is close to edge on overflow weir 13 tops.When oil reservoir appears in foam section, for preventing back-mixing, by oil wiper 11, the oil slick of foam section enrichment is blown off in time, by dregs of fat relief outlet 6, discharged, realize the separation of oil in water emulsion from waste water.
The bubbling segment of air-floatation processing device for emulsified oil sewage is equivalent to a kind of multi-stage circular flow reactor, and therefore knockout tower of the present invention bottom bubbling segment becomes a kind of gas lift type common loop reactor, the gas-liquid separator that top foam section is overflow groove type.Guide shell 5 in bubbling segment is multilevel deflector cylinder or single-stage guide shell, and single-stage guide shell is conventional design, and multilevel deflector cylinder designs according to patent CN1435275.Air-floatation processing device for emulsified oil sewage height overall is 3～12 with the ratio of bubbling segment internal diameter, and draft tube diameter is 0.3～0.9 with the ratio of bubbling segment internal diameter.The bubbling segment of air-floatation processing device for emulsified oil sewage and the diameter of foam section ratio are 1: 1.4～1: 1.8, and aspect ratio is 1: 0.4～1: 0.8; The ratio of foam section overflow groove weir and bubbling segment diameter is 1: 1～1.4: 1, and the aspect ratio of overflow groove weir and foam section is 0.1: 1～0.3: 1.
Adopt the separating of oil heavy emulsified oil in wastewater of operate continuously mode, the air supporting of breakdown of emulsion-circulation-scrape.
Waste water is the super viscous crude processing waste water of certain refinery, and total COD is 42000mg/L, and wherein oil in water emulsion and the shared COD of other colloidal suspensions are 40000mg/L, and the mean diameter of emulsion droplet is 2.5 μ m.The diameter ratio of circling and bubbling separation column bubbling segment and foam section is 1: 1.4, and aspect ratio is 1: 0.8; Foam section overflow groove weir and bubbling segment diameter ratio are 1: 1, and the aspect ratio of overflow groove weir and foam section is 0.3: 1.Guide shell is secondary guide shell; Special micropore (mean pore size is 3 μ m) column gas distributor (diameter 20mm, high 60mm) is equipped with at reactor bottom center, and liquid amount is 42L.Emulsion splitter is polyether demulsification agent DL32, is mixed with the aqueous solution that concentration is 40g/L, with the stream rate of acceleration of 10mL/h, adds bubbling segment; Empty tower gas velocity is 0.9cm/s; Oil scraper is board-like Oil scraper, and scraper plate length is 1: 1 with circling and bubbling separation column bubbling segment diameter ratio, within ten minutes, starts once; Waste water is at the hydraulic detention time 2h of foam section.Water outlet COD is 900mg/L, and the decreasing ratio of oil in water emulsion reaches 97%.Waste water yield is 99%.
Adopt the separating of oil heavy emulsified oil in wastewater of batch formula operating method, the air supporting of breakdown of emulsion-circulation-scrape.
Waste water and device are with embodiment 1.Emulsion splitter is fatty amines PAE 1912, and consumption is 6.0g, is mixed with the aqueous solution that concentration is 60g/L, with the stream rate of acceleration of 10mL/h, adds bubbling segment; Empty tower gas velocity is 1.1cm/s, and Oil scraper is belt Oil scraper, and bandwidth is 0.7: 1 with circling and bubbling separation column bubbling segment diameter ratio, within ten minutes, starts once; ; Disengaging time 1.5h.Water outlet COD is 1400mg/L, and the decreasing ratio of oil in water emulsion reaches 97%.Waste water yield is 98%.
The present embodiment is oil in water emulsion removal effect in different emulsion splitters and consumption situation thereof, adopts batch formula operation.
Waste water, device, emulsion splitter and consumption thereof and fed-batch mode, Oil scraper, the residence time are all with embodiment 1.Empty tower gas velocity is 1.1cm/s, disengaging time 2h.Emulsion splitter adopts five kinds of schemes.Option A: polyether demulsification agent DL32, is mixed with the aqueous solution that content is 40g/L, stream rate of acceleration 0.1L/h; Option b: emulsion splitter CAPG emulsion splitter CAPG-131, is mixed with the aqueous solution that content is 38g/L, stream rate of acceleration 0.1L/h; Scheme C: emulsion splitter is emulsion splitter CAPG emulsion splitter CAPG-08143, is mixed with the aqueous solution that content is 42g/L, stream rate of acceleration 0.1L/h; Scheme D: emulsion splitter TJ-3, is mixed with the aqueous solution that content is 42g/L, stream rate of acceleration 0.1L/h; Scheme E: emulsion splitter is fatty amines PAE 1912, is mixed with the aqueous solution that content is 42g/L, stream rate of acceleration 0.1L/h; Under different schemes, the decreasing ratio of water outlet COD and oil in water emulsion is listed in the following table.
Embodiment 4
The present embodiment is oil in water emulsion removal effect in the different situation of air flow, adopts operate continuously.
Waste water, device, emulsion splitter and consumption thereof and fed-batch mode, Oil scraper, the residence time are all with embodiment 1.When empty tower gas velocity is respectively 0.5cm/s, 0.9cm/s and 1.5cm/s, water outlet COD is followed successively by 2100mg/L 1500mg/L and 1000mg/L, and the decreasing ratio of oil in water emulsion is followed successively by 95%, 96% and 97%.Waste water yield is followed successively by 98%, 98%, 99%.
The present embodiment is oil in water emulsion removal effect in certain oil field extremely-viscous crude sewage, adopts operate continuously.
Waste water is certain oil field extremely-viscous crude sewage, total COD56000mg/L, and wherein oil in water emulsion and the shared COD of other colloidal suspensions are 54000mg/L, the mean diameter of emulsion droplet is 2.54 μ m.Device and liquid amount are with embodiment 1.Emulsion splitter is demulsiferTJ-1, is mixed with the aqueous solution that concentration is 40g/L, with the stream rate of acceleration of 50mL/h, adds bubbling segment; Empty tower gas velocity is 1.0cm/s; Oil scraper starts once for ten minutes; Hydraulic detention time 2h.Water outlet COD is 1100mg/L, and the decreasing ratio of oil in water emulsion reaches 98%.Waste water yield is 98%.
Adopt the separating of oil heavy emulsified oil in wastewater of operate continuously mode, the air supporting of breakdown of emulsion-circulation-scrape.
Waste water is the super viscous crude processing waste water of certain refinery, and total COD is 48000mg/L, and wherein the shared COD of oil in water emulsion is 45000mg/L.The diameter ratio of circling and bubbling separation column bubbling segment and foam section is 1: 1.8, and aspect ratio is 1: 0.4; Foam section overflow groove weir and bubbling segment diameter ratio are 1.4: 1, and the aspect ratio of overflow groove weir and foam section is 0.1: 1.Guide shell is single-stage guide shell.Special micropore (mean pore size is 3 μ m) column gas distributor (diameter 20mm, high 60mm) is equipped with at reactor bottom center, and liquid amount is 30L.Water inlet speed is respectively 15L/h, 30L/h, 60L/h; Emulsion splitter is TJ-2, is mixed with the aqueous solution that concentration is 40g/L, with the stream rate of acceleration of 50mL/h, adds bubbling segment; Empty tower gas velocity is 0.9cm/s; Oil scraper starts once for ten minutes; Residence time 1h.Water outlet COD is respectively 1400,1700,2000mg/L, and the decreasing ratio of oil in water emulsion reaches respectively 97%, 96%, 94%.It is 99%, 98%, 99% that waste water yield is respectively.
Embodiment 7
Adopt the separating of oil heavy emulsified oil in wastewater of operate continuously mode, the air supporting of breakdown of emulsion-circulation-scrape.
Waste water is the super viscous crude processing waste water of certain refinery, and total COD is 48000mg/L, and wherein the shared COD of oil in water emulsion is 45000mg/L.The diameter ratio of circling and bubbling separation column bubbling segment and foam section is 1: 1.8, and aspect ratio is 1: 0.4; Foam section overflow groove weir and bubbling segment diameter ratio are 1.4: 1, and the aspect ratio of overflow groove weir and foam section is 0.1: 1.Guide shell is single-stage guide shell.Special micropore (mean pore size is 3 μ m) column gas distributor (diameter 20mm, high 60mm) is equipped with at reactor bottom center, and liquid amount is 30L.Water inlet speed is 30L/h; Emulsion splitter is TJ-2, is mixed with the aqueous solution that concentration is 40g/L, and the stream rate of acceleration with 30mL/h, 90mL/h, 150mL/h adds bubbling segment respectively; Empty tower gas velocity is 0.9cm/s; Oil scraper starts once for ten minutes; Residence time 1h.Water outlet COD is respectively 2100,1700,1500mg/L, and the decreasing ratio of oil in water emulsion reaches respectively 95%, 96%, 97%.It is 99%, 98%, 99% that waste water yield is respectively.
Claims (6)
1. the method that degreases of ultra-thick oil waste water, super viscous crude is that the kinematic viscosity of 100 ℃ reaches 100mm
2oil more than/s; It is characterized in that: degreasing of ultra-thick oil waste water adopts the circling and bubbling separation column consisting of bubbling segment and foam section, and bottom bubbling segment is gas lift type common loop reactor, the gas-liquid separator that top foam section is overflow groove type; Oil wiper is equipped with at overflow groove top; The method that degreases adopts batch formula operation or operate continuously; Wherein:
The formula of criticizing operation: the disposable circling and bubbling separation column bubbling segment that pumps into of waste water, liquid level is not less than edge on guide shell, slowly stream adds mass concentration 20% sodium hydroxide or 0.1M hydrochloric acid, regulating pH is 8～9, from gas distributor, pass into air, air flow guarantees that empty tower gas velocity is 0.5～1.5cm/s, and slowly stream adds the emulsion splitter aqueous solution, this aqueous solution dose volume concentration is saturation concentration 5%～15%, and stream dosage is 0.1～0.5% of bubbling segment volume per hour; After oil slick produces, start oil wiper, start to collect oil slick from the dregs of fat relief outlet of foam section bottom simultaneously, from bubbling segment bottom leakage fluid dram, discharge and remove the waste water oil in water emulsion, after the decreasing ratio of oil in water emulsion reaches more than 90%, complete the operation of batch;
Operate continuously: pass into air in circling and bubbling separation column, guarantee that empty tower gas velocity is 0.5～1.5cm/s, the in advance slow stream of waste water adds mass concentration 20% sodium hydroxide or 0.1M hydrochloric acid, regulating pH is 8～9, then by pump, pump into the bubbling segment of circling and bubbling separation column, the residence time is 0.5～2h, and feeding rate is 0.5～2 times of bubbling segment volume per hour; Emulsion splitter is configured to the aqueous solution, and this aqueous solution dose volume concentration is saturation concentration 5%～15%, is stored in emulsion splitter solution storage tank, with volume pump, with constant rate of speed stream, is added to bubbling segment, and stream rate of acceleration is 0.1～0.5% of bubbling segment volume per hour; After oil slick produces, start Oil scraper, from dregs of fat relief outlet, collect continuously oil in water emulsion; From bubbling segment bottom leakage fluid dram, discharge and remove the waste water oil in water emulsion, in whole operating process, guarantee that in tower, liquid amount is constant;
Described emulsion splitter is one or more in polyether demulsification agent, CAPG, fatty amines emulsion splitter; Consumption is: 0.02～0.1mmol/g COD.
2. the method that degreases of ultra-thick oil waste water according to claim 1, is characterized in that: described polyether demulsification agent, quality index is: 100 ℃ of kinematic viscosity>=10mm
2/ s, acid number 50-70mgKOH/g, 20 ℃ of density 850-950kg/m
3, open flash point>=105 ℃; CAPG emulsion splitter, quality index is: solid content 50 ± 2%, pH value 7 ± 1; Fatty amines emulsion splitter, quality index is: hydroxyl value≤50mgKOH/g, colourity≤300APHA.
3. the method that degreases of ultra-thick oil waste water according to claim 1, is characterized in that: the diameter of described circling and bubbling separation column bubbling segment and foam section is than being 1:1.4～1:1.8, and aspect ratio is 1:0.4～1:0.8; Foam section overflow groove weir and bubbling segment diameter are than being 1:1～1.4:1, and the aspect ratio of overflow groove weir and foam section is 0.1:1～0.3:1, and the guide shell in bubbling segment is single-stage or multilevel deflector cylinder.
4. the method that degreases of ultra-thick oil waste water according to claim 1, it is characterized in that: the emulsion droplet of described waste water is within the scope of 2～10 μ m, the COD that oil in water emulsion produces accounts for 75%～95% of the total COD of waste water, and described waste water includes but not limited to oil tank bottom dehydration, desalination decalcification sewage, oil field extremely-viscous crude sewage, the coking water of condensation that steams out greatly.
5. the method that degreases of ultra-thick oil waste water according to claim 1, is characterized in that: described oil wiper is board-like or belt.
6. the method that degreases of ultra-thick oil waste water according to claim 5, is characterized in that: board-like Oil scraper, scraper plate length with circling and bubbling separation column bubbling segment diameter than being 1:1; Belt Oil scraper, bandwidth is 0.7:1 with circling and bubbling separation column bubbling segment diameter ratio.
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| CN104556626B (en) * | 2013-10-22 | 2016-02-10 | 中国石油化工股份有限公司 | A kind of greasy filth emulsion splitter and greasy filth recycling treatment process |
| CN105907456B (en) * | 2016-05-04 | 2019-06-18 | 浙江海洋大学 | A kind of purification processing method of fish oil |
| CN107828961B (en) * | 2017-11-02 | 2024-04-05 | 中国科学院过程工程研究所 | Extraction method of rare earth element ions and obtained rare earth enrichment liquid |
| CN108721946A (en) * | 2018-05-17 | 2018-11-02 | 新疆中泰新鑫化工科技股份有限公司 | Continuous demulsification method in chlorinated polyether resin production |
| CN112945692A (en) * | 2021-02-05 | 2021-06-11 | 成都理工大学 | Bubbling separation online enrichment system for trace heavy metals in environmental water |
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| CN1435275A (en) * | 2002-02-01 | 2003-08-13 | 中国石油天然气股份有限公司 | Multistage circulation reactor |
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