CN106745946B - Oil-sand method for processing wash water - Google Patents
Oil-sand method for processing wash water Download PDFInfo
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- CN106745946B CN106745946B CN201510825380.7A CN201510825380A CN106745946B CN 106745946 B CN106745946 B CN 106745946B CN 201510825380 A CN201510825380 A CN 201510825380A CN 106745946 B CN106745946 B CN 106745946B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Water Treatment By Sorption (AREA)
Abstract
A kind of oil-sand method for processing wash water, includes the following steps：1) waste water separated after washing oil-sand is mixed by first order venturi mixer with acid or alkali, between the pH value for adjusting waste water is 6.0~8.6；2) waste water after treatment again passes by second level venturi mixer and is mixed with demulsifier；3) demulsification will be passed through treated waste water is discharged into oil removal settling tank, and remove suspended oil and sandy soil；4) waste water after settling oil removal carries out cyclonic separation；5) waste water after cyclonic separation is entered into coagulation air-float device, further removes the suspended matter in waste water and the oils in suspended state；6) step 5) will be passed through treated that waste water is filtered；7) step 6) treated washings will be passed through by ultrafiltration and reverse-osmosis treated, obtain oil-sand washing recycle water.The processing procedure can realize advanced treating to oil-sand washings, the washing separation of treated recycle-water is more advantageous to oil-sand.
Description
Technical field
The present invention relates to a kind of processing methods of oil-sand washings, and in particular to oil-sand washings after treatment, remove
The many kinds of substance such as sand grains, clay, oil sands bitumen and deliquescent salt therein, the side recycled as oil-sand washings
Method.
Background technology
Oil-sand as a kind of unconventional petroleum resources, wherein oil sands bitumen content 5~20%, sand and clay content 80~
85%, aqueous 3~5%.Its stock number accounts for about the 30% of world oil reserves, if all utilization is produced, according to the present world
The desired level of the energy, for century-old on consumed worldwide, the utilization of oil-sand become new growth engines.According to oil-sand master
Host country of the resources is wanted to count, the oil-sand resource amount that the world is verified at present is about 3.8 trillion barrels.It is mainly distributed on Canada, Venezuela
And the U.S., in the world most of oil-sand resource concentrate on Transport Model for Alberta province the north basins Athabasca and Pinghu and Ah
Er Baita saves the chilling index with Saskatchewan intersection.The development of oil-sand makes Canadian petroleum reserves be only second to Saudi Arabia
The whole world second is occupied, international community is allowed to be further appreciated that the value of oil-sand.A large amount of oil-sand resource is had also discovered in China, is stored up
About 100,000,000,000 tons of amount, according to the 5th, the world, is concentrated mainly on 24 basins such as Zhunger Basin, Qaidam, Erdos and pine the Liao Dynasty.
In China's National Oil Gas Resources investigation, oil-sand resource is included in appraisement system for the first time, by evaluation, the oil content of China's oil-sand exists
5%~20%, there is good economic development value and foreground.
Currently, in the world oil-sand exploitation, separation be still in infancy, oil-sand have viscosity is big, density is high, separation
Viscous crude contains a large amount of small grains of sand and minerals, and many technologies are still had in the separation, processing and tailings glass of oil sands bitumen
Problem, oil-sand exploitation application are constantly subjected to restrict.Huge toxic tailing pit is generated in oil-sand recovery process, and environment is caused
Very big harm.Maximum seven oil-sand companies (Canadian Natual Resources, Imperial Oil, Shell
Canada, Suncor Energy, Syncrude Canada Ltd., Teck Resources and Total E＆PCanada)
An alliance is set up in December, 2010, to solve most intractable one of the challenge of industry：Clear up their huge toxic tailing pit.
This means that oil-sand company will make joint efforts, unified strength pushes tailing management and switching technology tricks of the trade, is sold without being attempt to
Perhaps but other people use its intellectual property.
Oil-sand strip mining transformation at present mainly uses washing separation technology, using the heating of thermokalite water, stirring, makes oil and sand point
From the waste generated in separation process is mainly water and oil sands bitumen, the mixture of suspended matter, clay, sand, chemical agent.
Since pitch mixes with water, clay visibly homogeneous, sedimentation separation is highly difficult.Transport Model for Alberta, which saves oil-sand mining area, at present 8
More than hundred million cubic metres of tailing is stored in 142 square kilometres of tailing pit, and tailing inventory is continuously increased.Based on centrifuge modelling
It studies, the ageing fine earth tailing in tailing pit needs ability free settling separation in more than 130 years, it not only stores a large amount of water
Vast soil is alsied occupy, the processing of the tailing pit waste water generated after oil-sand washing and Utilizing question are oil-sand processing enterprise faces
One of huge challenge faced.
CN101855177A propositions are a kind of to use membrane separating method, processing oil-sand to wash tailing water, contain in the waste water
A large amount of clay, oil sands bitumen and chemical agent, processing procedure film are easy to block, and energy expenditure is big.
CN103359861A proposes a kind of processing method of oil-sand washes, includes the following steps：Oil-sand is exploited dirty
Water carries out homogenization in homogeneous slot, and the sewage after homogenization, which is then entered air-float degreasing device, carries out at oil removal by air bubbling
Reason removes partial suspended oil and a small amount of oil emulsion；Sewage after air supporting is entered into flocculation-air floating device, detaches flocculate；It will
Flocculation-air floating sewage is centrifuged, and obtains sands formation re-injection water.The process is in oil removal by air bubbling and flocculation-air floating process
In, a large amount of clay and the grains of sand are contained in sewage, blocking pipeline and equipment is easy, influences the long-term operation of device.
CN103351072A provides a kind of oil-sand exploitation wastewater treatment method, and the sewage that oil-sand washing is isolated is carried out
Then homogeneous carries out oil removal by air bubbling, remove most of suspended oil and a small amount of oil emulsion, flocculation treatment is then carried out, after flocculation
Waste water clarified, filtered, softened, centrifuged, obtain boiler reinjected water.To in washings in the process pretreatment process
The removal separation for not carrying out depth containing a large amount of sand, will bring prodigious difficulty to the subsequent processing of waste water.
CN102676199A discloses the processing system of a kind of oil sand tailing or oil sand slurries, can be from oil sand tailing or oil
Residual bitumen is recycled in placer slurry, and oil sand tailing can be cured, so as to easily use at mode economical and environmentally friendly
It sets.
In conclusion for the treatment technology of current oil-sand washings, although certain processing, reuse effect can be reached
Fruit, while also there are still shortcomings, influence the reuse of oil-sand washings, form a large amount of tailing pit, cause water resource
Waste and serious environmental pollution, it would be highly desirable to handle.
Invention content
The purpose of the present invention is to provide a kind of oil-sand method for processing wash water, and water is be easy to cause in the prior art to overcome
The waste of resource and the defect of serious environmental pollution.
To achieve the above object, the present invention provides a kind of oil-sand method for processing wash water, includes the following steps：
The waste water that step 1 is separated after washing oil-sand is mixed by first order venturi mixer with acid or alkali, is adjusted
Between the pH value for saving waste water is 6.0~8.6；
Step 2 again passes by second level venturi mixer and is mixed with demulsifier by step 1 treated waste water,
The dosage that demulsifier is added in control is 30~300mg/L；
Step 3 will pass through step 2, and treated that waste water is discharged into oil removal settling tank, and it is 0.5 to be kept for the residence time of waste water
~3.0h removes suspended oil and sandy soil；
Waste water after step 4 settles oil removal carries out cyclonic separation, removes the particulate matter that grain size is 50 μm or more in water removal；
Waste water after cyclonic separation is entered coagulation air-float device by step 5, further removes the suspended matter in waste water
And in the petroleum substance to suspend with dissolved state；
Step 6 will pass through step 5, and treated that waste water is filtered, and obtains oil-sand washings；And
Step 7 will pass through step 6 treated oil-sand washings by ultrafiltration and reverse osmosis unit, obtain oil-sand washing
Recycle-water.
Oil-sand method for processing wash water of the present invention, wherein acid described in step 1 is preferably hydrochloric acid, sulfuric acid, vinegar
Acid, carbonic acid, hypochlorous acid or nitric acid；The more preferably concentrated sulfuric acid.
Oil-sand method for processing wash water of the present invention, wherein the dosage of demulsifier described in step 2 is preferably
50~300mg/L.
Oil-sand method for processing wash water of the present invention, wherein the residence time of waste water is preferably 1 in the step 3
~2.5h.
Oil-sand method for processing wash water of the present invention, wherein in step 5 preferably in the coagulation air-float device
Flocculant is added.
Oil-sand method for processing wash water of the present invention, wherein the flocculant is preferably inorganic polymer flocculant
Or organic polymer coargulator.
Oil-sand method for processing wash water of the present invention, wherein the inorganic polymer flocculant preferably polymerize chlorine
Change aluminium or aluminium silicate polymer.
Oil-sand method for processing wash water of the present invention, wherein the organic polymer coargulator be preferably cation,
Anion or non-ionic polyacrylamide.
Oil-sand method for processing wash water of the present invention, wherein the cationic-type polyacrylamide molecular weight is preferred
It is 700~10,000,000.
Oil-sand method for processing wash water of the present invention, wherein the inorganic polymer flocculant dosage is preferably
40~300mg/L.
Oil-sand method for processing wash water of the present invention, wherein the organic polymer coargulator dosage is preferably 2
~50mg/L.
Oil-sand method for processing wash water of the present invention, wherein filter element for filtration material described in step 6 is preferably
Quartz sand, activated carbon or chemical fibre.
Oil-sand method for processing wash water of the present invention, wherein demulsifier described in step 2 is preferably ethers demulsification
Agent, aldehydes demulsifier or lipid demulsifier.
Oil-sand method for processing wash water of the present invention, wherein ultrafiltration and reverse osmosis excellent with film in the step 7
It is selected as organic film or inoranic membrane.
Oil-sand method for processing wash water of the present invention, wherein in the step 7, it is preferred that oil-sand washings
First by ultrafiltration apparatus, then pass through reverse osmosis unit.
Beneficial effects of the present invention：
The present invention uses the deep treatment method of " the oil removal sedimentation-cyclonic separation-bis- films of coagulation air-float-filtering-".Its advantage
It is：1. to a large amount of sands contained in oil-sand washes, different, the sedimentation time difference according to its grain size carries out multilayer
Secondary classification processing, class settling, sand sedimentation are more thorough；2. according to asphalt-base petroleum substance in waste water, there are shapes in waste water
State is different, oil droplet size difference, carries out classification separation, and petroleum substance separation removal is more thorough；3. to the grains of sand, glutinous in waste water
The many kinds of substance such as soil, petroleum-type realize advanced treating；4. being used in series using two-stage venturi mixer, Flow of Goods and Materials speed
Soon, the sand grains for avoiding grain size larger is deposited on inside equipment or pipeline, is blocked；5. using the oil-sand washing after double film process
Water can remove the salt dissolved in washings and a variety of dissolved matters, overcome washings recycle during salt and
The accumulation of multiple harmful substances；6. the technology is more advantageous to oil-sand washing separation, be conducive to washings recycling, processing procedure
Low energy consumption, high treating effect.
Description of the drawings
Fig. 1 is the method flow schematic diagram of the embodiment of the present invention 1；
Wherein, reference numeral：
1- first order venturi mixers；
The second level 2- venturi mixer；
3- oil removal settling tanks；
4- cyclones；
5- coagulation air-float devices；
6- filters；
7- ultra-filtration membrane devices；
8- reverse osmosis units.
Specific implementation mode
Oil-sand washes is passed through venturi mixer by the present invention first, is neutralized and is mixed with demulsifier, is then drained into
Oil removal settling tank, oil separator water outlet carry out cyclonic separation, air supporting and filtering and double film process, the washing generated after oil-sand is washed
It is recycled after water process.Specifically include following steps：
The waste water that step 1 is separated after washing oil-sand is mixed with strong acid (or alkali) by first order venturi mixer
It closes, between the pH value for adjusting waste water is 6.0~8.6；
Step 2 again passes by second level venturi mixer, is mixed with demulsifier by step 1 treated waste water,
The dosage that demulsifier is added in control is 50~300mg/L；
Step 3 will pass through step 2, and treated that waste water is discharged into oil removal settling tank, and it is 0.5 to be kept for the residence time of waste water
~3.0h removes a large amount of sand in the most of suspended oil and waste water in water；
Waste water after step 4 settles oil removal carries out cyclonic separation, removes the particulate matter that grain size is 50 μm or more in water removal；
Waste water after cyclonic separation is entered coagulation air-float device by step 5, depth remove suspended matter in waste water,
In the petroleum substance to suspend with dissolved state；
Treated that waste water is filtered by step 5 for step 6, filtered water turbidity≤5NTU, and petroleum content≤
25mg/L, suspension content≤25mg/L；
Step 7 will enter ultrafiltration and reverse osmosis unit by filtered waste water, and depth removes salt in waste water and molten
Other harmful ions of solution state, obtain oil-sand washings；
Currently preferred process conditions are as follows：
The acid added in venturi mixing is selected from hydrochloric acid, sulfuric acid, nitric acid etc., the preferably concentrated sulfuric acid, can also select other weak
Acid.
PH value preferably 7.6~8.2；Demulsifier dosage preferably 50~150mg/L, retention time of sewage is preferred in settling tank
1~2.5h.
It is that inorganic polymer flocculant and organic polymer are wadded a quilt with cotton that flocculant, flocculation medicament are needed in coagulation air-float processing procedure
Solidifying agent；Inorganic polymer flocculant preferred polymeric aluminium chloride, aluminium silicate polymer, dosage preferably 40~100mg/L；Organic polymer
Flocculant preferred cationic polyacrylamide, molecular weight preferably 700~10,000,000, dosage preferably 2~50mg/L.
Filter element material can select quartz sand, activated carbon and chemical fibre etc., preferably chemical fibre and quartz sand material.
Demulsifier can select to use ethers demulsifier, aldehydes demulsifier or lipid demulsifier.
The film that ultrafiltration and reverse osmosis unit use, inorganic ceramic membrane, which may be used, can also use organic film.
In the present invention, the concentrated sulfuric acid is added in First venturi mixing period in oil-sand washes, adjusts the soda acid of waste water
After degree, into second venturi mixer, waste water enters oil removal settling tank after being mixed with demulsifier, in oil removal settling tank,
Oil droplet in emulsified state is subjected to coalescence, removal of floating, a large amount of sand sedimentation removal in waste water；Settling tank water outlet enters
Cyclone separator, the different centrifugal force generated by density contrast further remove the sand of about 50 μm of grain size or more in waste water；Through
It crosses cyclone treated that waste water enters coagulation air-float device, pass through and high valency electrolytes are added, destroy the stabilization shape of water-borne glue body
State, makes that suspended matter is de- steady, agglomerates and removes, and during air supporting, a large amount of microbubble is attached on oil droplets, helps to make place
Floating in the fine oil droplets of suspended state and removal；A large amount of alumen ustum is generated in coagulation process, the absorption using alumen ustum and " net
Catch " it acts on, depth removes the petroleum substance that emulsified state is in waste water.By coagulation air-float, treated that waste water entered
Filter, after filtration treatment, water turbidity≤5NTU, petroleum content≤25mg/L, suspension content≤25mg/L.After filtering
Waste water first carry out hyperfiltration treatment, subsequently into reverse osmosis unit, reverse osmosis unit water outlet can meet wanting for oil-sand washings
It asks.
The main characteristic of the invention lies in that the sand content for isolating waste water for oil-sand washing is high, not only have in waste water
The grains of sand also have a large amount of clay, are easy to block pipeline and equipment, it is difficult to sedimentation separation；Petroleum substance in waste water is with asphaltic base
Based on crude oil, density is closer with water, and asphalt-base crude oil mixes fully with the grains of sand, clay, it is difficult to detach.Select two-stage text mound
In mixer be used in series, it is that Flow of Goods and Materials speed is high in venturi mixer that reason, which has, prevents contained a large amount of sand of waste water
Soil sedimentation, occluding device and pipeline.
The present invention uses oil removal settling tank, waste water that can settle out the larger sand of grain size, while waste water in the equipment
Middle part carries out floating separation in the petroleum-type of suspended state.
The present invention is using a large amount of sands contained in cyclone separation waste water, by fluid high-speed flowing and rotary course
The centrifugal force of generation carries out the separation of sand in waste water, and separative efficiency is high, separating rate is fast.
The present invention uses coagulation air-float, handles suspended matter and oils in waste water, and main cause is by the way that high price electricity is added
Xie Zhi destroys the stable state of water-borne glue body, makes that suspended matter is de- steady, agglomerates and removes, during air supporting, a large amount of microbubble
Oil droplets are attached on, the floating of the fine oil droplets in suspended state and removal are contributed to；It is generated in coagulation process a large amount of
Alumen ustum is acted on using the absorption of alumen ustum and " net is caught ", and depth removes the petroleum substance that emulsified state is in waste water.
The present invention uses filter as oil-sand washes treatment process, and main cause is to increase level-one for recycle-water to protect
Barrier and safety, can be with the suspended matter and petroleum substance in filtered wastewater.
For the present invention to the oil-sand washings after filter by double film process, main cause is with oil-sand washing water reuse
The increase of number, the salt and a variety of dissolubility harmful substance accumulations dissolved in washings significantly increase, the washing to oil-sand
Effect separation generates apparent influence.After oil-sand washing water reuse 3~7 times, can by recycle-water all by double film process after
Reuse is carried out again, can also keep the washing separating effect of oil-sand by part oil sand washings by reuse after double film process.
Embodiment 1：
Oil-sand washes pH value is 10.2, and sand content 5600mg/L, oil content 1200mg/L are mixed by venturi
After device adds concentrated sulfuric acid mixing, pH value of waste water of adjusting is 7.6, then adds polyethers demulsification 100mg/L, is mixed by venturi
Device mixes, and waste water enters oil removal settling tank, sedimentation time 1.6h, sand content 1100mg/L in settling tank water outlet, oil content
100mg/L.Settling tank treated waste water is sent into cyclone, sand content is 160mg/L after cyclonic separation, then into
Row coagulation air-float and filter device, aluminium silicate polymer dosage are 50mg/L, and cationic polyacrylamide addition is 2mg/L, mistake
Cocoanut active charcoal is loaded in filter.Filter delivery turbidity 4.6NTU, petroleum content 6.0mg/L, suspension content are
23mg/L, waste water can be used as oil-sand washings, recycle.
Comparative example 1：
By oil-sand washes, pH value 10.2, sand content 5600mg/L, oil content 1200mg/L, in homogeneous slot
Homogenization is carried out, pH value of waste water of adjusting is 7.6, and the sewage after homogenization is then entered air-floating apparatus, and aluminium silicate polymer is thrown
Dosage is 50mg/L, and cationic polyacrylamide addition is 2mg/L, after carrying out oil removal by air bubbling processing, to being produced during air supporting
Raw dross is centrifuged, and dross is sent to garbage disposal site and is focused on.Air-floating apparatus water outlet is analyzed, is tied
Fruit shows：Delivery turbidity 36.7NTU, petroleum content 52mg/L, suspension content 87mg/L, turbidity, the oil of waste water
Class and suspension content are difficult to reach reuse requirement, it is also necessary to be further processed；More seriously, neutralize regulating reservoir and
There is a large amount of sand to deposit in flotation tank and the inlet/outlet pipeline of equipment, needs the operation for constantly clearing up ability holding meanss.
Embodiment 2：
Oil-sand washes pH value is 9.8, and sand content 3300mg/L, oil content 1400mg/L are mixed by venturi
After device adds concentrated sulfuric acid mixing, pH value of waste water of adjusting is 7.9, then adds polyethers demulsification 100mg/L, is mixed by venturi
Device mixes, and waste water enters oil removal settling tank, sedimentation time 3h, sand content 1000mg/L in settling tank water outlet, oil content
110mg/L.Settling tank treated waste water is sent into cyclone, sand content is 120mg/L after cyclonic separation, then into
Row coagulation air-float and filter device, aluminium silicate polymer dosage are 80mg/L, and cationic polyacrylamide addition is 30mg/L, mistake
Quartz sand is loaded in filter.Filter delivery turbidity 5.0NTU, petroleum content 24mg/L, suspension content 25mg/L.
To the water outlet as oil-sand washings, after recycling 3 times, by double film process, oil-sand washings are then used as, it is oily after washing
Petroleum substance content in sand residue is 0.32%.
Comparative example 2：
High oil-sand washes pH value is 9.8, and sand content 3300mg/L, oil content 1400mg/L are mixed by venturi
After clutch adds concentrated sulfuric acid mixing, pH value of waste water of adjusting is 7.9, then adds polyethers demulsification 100mg/L, is mixed by venturi
Clutch mixes, and waste water enters oil removal settling tank, sedimentation time 3h, sand content 1000mg/L in settling tank water outlet, oil content
110mg/L.Settling tank treated waste water is sent into cyclone, sand content is 120mg/L after cyclonic separation, then into
Row coagulation air-float and filter device, aluminium silicate polymer dosage are 80mg/L, and cationic polyacrylamide addition is 30mg/L, mistake
Quartz sand is loaded in filter.Filter delivery turbidity 5.0NTU, petroleum content 24mg/L, suspension content 25mg/L.
The water outlet is continued as oil-sand washings, the stone after washing in oil sand tailings as oil-sand washings after recycling 3 times
Oily substance content is 0.41%.Oil-sand washings, after recycling 3 times, by without double film process, directly as oil-sand
Washings can cause the petroleum-type in oil sand tailings after washing due to the accumulation of salt and other harmful ions in washing process
The rising of content of material influences the washing effect of oil-sand.
Embodiment 3：
Oil-sand washes pH value is 9.0, and sand content 6000mg/L, oil content 1500mg/L are mixed by venturi
After device adds concentrated sulfuric acid mixing, pH value of waste water of adjusting is 8.2, then adds polyethers demulsification 220mg/L, is mixed by venturi
Device mixes, and waste water enters oil removal settling tank, sedimentation time 3h, sand content 1800mg/L in settling tank water outlet, oil content
150mg/L.Settling tank treated waste water is sent into cyclone, sand content is 170mg/L after cyclonic separation, then into
Row coagulation air-float and filter device, aluminium silicate polymer dosage are 100mg/L, and cationic polyacrylamide addition is 50mg/L,
Chemical fibre matter filler is loaded in filter.Filter delivery turbidity 3.0NTU, petroleum content 16mg/L, suspension content are
20mg/L.To the water outlet as oil-sand washings, after recycling 7 times, by double film process, oil-sand washings are then used as,
Petroleum substance content after washing in oil sand tailings is 0.34%.
Comparative example 3：
Oil-sand washes pH value is 9.0, and sand content 6000mg/L, oil content 1500mg/L are mixed by venturi
After device adds concentrated sulfuric acid mixing, pH value of waste water of adjusting is 8.2, then adds polyethers demulsification 220mg/L, is mixed by venturi
Device mixes, and waste water enters oil removal settling tank, sedimentation time 3h, sand content 1800mg/L in settling tank water outlet, oil content
150mg/L.Settling tank treated waste water is sent into cyclone, sand content is 170mg/L after cyclonic separation, then into
Row coagulation air-float and filter device, aluminium silicate polymer dosage are 100mg/L, and cationic polyacrylamide addition is 50mg/L,
Chemical fibre matter filler is loaded in filter.Filter delivery turbidity 3.0NTU, petroleum content 16mg/L, suspension content are
20mg/L.The water outlet is continued as oil-sand washings, oil sand tailings after washing as oil-sand washings after recycling 7 times
In petroleum substance content be 0.58%.Oil-sand washings, after recycling 7 times, by without double film process, directly making
It can be caused after washing in oil sand tailings due to the accumulation of salt and other harmful ions in washing process for oil-sand washings
The rising of petroleum substance content influences the washing effect of oil-sand.
Embodiment 4：
Oil-sand washes pH value is 12.0, and sand content 1200mg/L, oil content 900mg/L are mixed by venturi
After device adds concentrated sulfuric acid mixing, pH value of waste water of adjusting is 8.6, then adds polyethers demulsification 30mg/L, is mixed by venturi
Device mixes, and waste water enters oil removal settling tank, sedimentation time 1.0h, sand content 400mg/L in settling tank water outlet, oil content
90mg/L.Settling tank treated waste water is sent into cyclone, sand content is 80mg/L after cyclonic separation, is then carried out
Coagulation air-float and filter device, aluminium silicate polymer dosage are 60mg/L, and cationic polyacrylamide addition is 50mg/L, filtering
Quartz sand is loaded in device.Filter delivery turbidity 4.6NTU, petroleum content 20mg/L, suspension content 18mg/L.It is right
The water outlet 50% is recycled directly as oil-sand washings, and in addition 50% water is made by double film process after two kinds of water mixing
For oil-sand washings, the petroleum substance content after washing in oil sand tailings is 0.34%.Oil-sand washings, a part is by double
Film process, a part by double film process, do not recycle after two kinds of water mixing, as oil-sand washings, still can reach
Preferable washing effect.
The present invention uses the deep treatment method of " the oil removal sedimentation-cyclonic separation-bis- films of coagulation air-float-filtering-".Its advantage
It is：1. to a large amount of sands contained in oil-sand washes, different, the sedimentation time difference according to its grain size carries out multilayer
Secondary classification processing, class settling, sand sedimentation are more thorough；2. according to asphalt-base petroleum substance in waste water, there are shapes in waste water
State is different, oil droplet size difference, carries out classification separation, and petroleum substance separation removal is more thorough；3. to the grains of sand, glutinous in waste water
The many kinds of substance such as soil, petroleum-type realize advanced treating, and treated, and waste water can be used as oil-sand washings to recycle；4. using
Two-stage venturi mixer is used in series, and Flow of Goods and Materials speed is fast, and the sand grains for avoiding grain size larger is deposited in equipment or pipeline
Portion blocks；5. using the oil-sand washings after double film process, the salt dissolved in washings and a variety of dissolvings can be removed
Property substance, overcome washings recycle during salt and multiple harmful substances accumulation to oil-sand washing generate unfavorable shadow
It rings；6. the technology is more advantageous to oil-sand washing separation, be conducive to washings recycling, low energy consumption for processing procedure, treatment effect
It is good.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
Various corresponding change and deformations, but these corresponding change and deformations can be made according to the present invention by knowing those skilled in the art
The protection domain of the claims in the present invention should all be belonged to.
Claims (14)
1. a kind of oil-sand method for processing wash water, which is characterized in that include the following steps：
The waste water that step 1 is separated after washing oil-sand is mixed by first order venturi mixer with acid or alkali, is adjusted useless
Between the pH value of water is 6.0~8.6；
Step 2 again passes by second level venturi mixer and is mixed with demulsifier by step 1 treated waste water, control
The dosage that demulsifier is added is 30~300mg/L；
Step 3 will pass through step 2, and treated that waste water is discharged into oil removal settling tank, keep the residence time of waste water be 0.5~
3.0h removes suspended oil and sandy soil；
Waste water after step 4 settles oil removal carries out cyclonic separation, removes the particulate matter that grain size is 50 μm or more in water removal；
Waste water after cyclonic separation is entered coagulation air-float device by step 5, further removes suspended matter and place in waste water
In the petroleum substance with dissolved state that suspends；
Step 6 will pass through step 5, and treated that waste water is filtered, and obtains oil-sand washings；And
Step 7 will pass through step 6 treated oil-sand washings by ultrafiltration and reverse osmosis unit, obtain oil-sand washing reuse
Water；
Wherein, demulsifier described in step 2 is ethers demulsifier, aldehydes demulsifier or lipid demulsifier.
2. oil-sand method for processing wash water according to claim 1, which is characterized in that acid described in step 1 is selected from salt
Acid, sulfuric acid or nitric acid.
3. oil-sand method for processing wash water according to claim 1, which is characterized in that the throwing of demulsifier described in step 2
Dosage is 50~300mg/L.
4. oil-sand method for processing wash water according to claim 1, which is characterized in that the stop of waste water described in step 3
Time is 1~2.5h.
5. oil-sand method for processing wash water according to claim 1, which is characterized in that in the coagulation air-float in step 5
Flocculant is added in device.
6. oil-sand method for processing wash water according to claim 5, which is characterized in that the flocculant is inorganic polymer
Flocculant or organic polymer coargulator.
7. oil-sand method for processing wash water according to claim 6, which is characterized in that the inorganic polymer flocculant is
Aluminium polychloride or aluminium silicate polymer.
8. oil-sand method for processing wash water according to claim 6, which is characterized in that the organic polymer coargulator is
Cation, anion or non-ionic polyacrylamide.
9. oil-sand method for processing wash water according to claim 8, which is characterized in that the cationic-type polyacrylamide
Molecular weight is 700~10,000,000.
10. oil-sand method for processing wash water according to claim 7, which is characterized in that the inorganic polymer flocculant
Dosage is 40~300mg/L.
11. oil-sand method for processing wash water according to claim 8, which is characterized in that the organic polymer coargulator
Dosage is 2~50mg/L.
12. oil-sand method for processing wash water according to claim 1, which is characterized in that filtering described in step 6 is filtered
Core material is quartz sand, activated carbon or chemical fibre.
13. oil-sand method for processing wash water according to claim 1, which is characterized in that ultrafiltration and anti-in the step 7
Infiltration is organic film or inoranic membrane with film.
14. oil-sand method for processing wash water according to claim 1, which is characterized in that in the step 7, oil-sand washing
Water by ultrafiltration apparatus, then passes through reverse osmosis unit first.
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| CN100525926C (en) * | 2007-06-22 | 2009-08-12 | 中国石油大学(北京) | Method for treating oil refining sewage by employing multi-stage inflatable cyclonic current technology |
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