CN103359861B - Treating technology and treating system for oil sand oil exploitation sewage - Google Patents
Treating technology and treating system for oil sand oil exploitation sewage Download PDFInfo
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- CN103359861B CN103359861B CN201310329939.8A CN201310329939A CN103359861B CN 103359861 B CN103359861 B CN 103359861B CN 201310329939 A CN201310329939 A CN 201310329939A CN 103359861 B CN103359861 B CN 103359861B
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Abstract
The invention provides a treating technology for oil sand oil exploitation sewage. The treating technology comprises the following steps: (a) oil sand oil exploitation sewage is subjected to homogenization in a homogeneity tank, the sewage after homogenization is then subjected to air floatation and oil removal in an air floatation and oil removal device, the removal rate of suspension oil is 85%-95%, and the removal rate of emulsified oil is 5 wt%-10 wt%; (b) the sewage obtained from the step (a) is subjected to flocculation and air floatation in a flocculation and air floatation device, and flocculates and flocculation and air floatation sewage are separated; (c) the flocculation and air floatation sewage is subjected to centrifugal separation to obtain oil sand layer reinjection water. The invention further provides a treating system for oil sand oil exploitation sewage. The treating system treats the oil sand oil exploitation sewage to obtain oil sand layer reinjection water which meets water quality requirements.
Description
Technical field
The present invention relates to technical field of sewage, particularly relate to treatment process and the treatment system of tar sand oil exploitation sewage.
Background technology
China is the country of a poor-water, and the annual lack of water total amount in the whole nation reaches 1,200,000,000 tons, and process water accounts for about 80% of urban water supply.Along with the fast development of China's economy, the increase of population, water pollution increases the weight of day by day, and shortage of water resources problem seriously restricts the development of industrial or agricultural.Therefore, at present sewage disposal can be used as the preferred option solving water shortage problem.
Oil-sand is a kind of settling sand being rich in rock asphalt, its essence is the mixture of pitch, sand, rich ore clay and water, and wherein, asphalt content is 10wt% ~ 12wt%, and the mineral such as sand and clay are 80wt% ~ 85wt%, and all the other are water.The tar sand oil that oil-sand produces after excavation industry processing just can be employed through further processing, if sewage is without rationally processing discharge, will cause environmental pollution.
After oil-sand drops into exploitation, the energy of pay sand own will constantly be consumed, and cause pay sand pressure constantly to decline, underground tar sand oil is degassed in a large number, and viscosity increases, and oil well output also can greatly reduce.In order to keep or improve sand pressure, obtain higher recovery ratio, water filling must be carried out to sands formation.Namely pay sand water filling utilizes water injection well that water is injected oil reservoir, to supplement and to keep sand pressure.
In order to enable oily(waste)water be fully used, the pay sand that can reinject after tar sand oil exploitation sewage processes reuses, and its oleaginousness≤20mg/L of the water quality requirement of oil reservoir reinjected water, suspended substance≤20mg/L, pH is 6.5 ~ 7.5.If namely tar sand oil exploitation sewage carry out re-injection without reasonable process, not only make surface facility normally not run, but also harm can be brought because of reservoir choke, also can cause environmental pollution simultaneously, affect tar sand oil safety in production.Therefore the invention provides the treatment process of a kind of tar sand oil exploitation sewage, enable the water after process as oil reservoir reinjected water.
Summary of the invention
The technical problem that the present invention solves is the treatment process and the treatment system that provide a kind of tar sand oil exploitation sewage, and the water obtained through treatment process of the present invention can be used in oil reservoir reinjected water.
In view of this, the invention provides the treatment process of a kind of tar sand oil exploitation sewage, comprise the following steps:
A) tar sand oil is exploited sewage and carry out homogenization treatment in homogeneous groove, the sewage after homogenization treatment is entered air-float degreasing device and carries out oil removal by air bubbling process, make the clearance of suspension oil be 85wt% ~ 95wt%, the clearance of oil in water emulsion is 5wt% ~ 10wt%;
B) sewage that step a) obtains is entered flocculation-air floating device and carry out flocculation-air floating process, be separated throw out and flocculation-air floating sewage;
C) described flocculation-air floating sewage is carried out centrifugation, obtain oil reservoir reinjected water.
Preferably, described in step a), homogenization treatment is specially:
Described tar sand oil exploitation sewage is entered homogeneous groove, adds emulsion splitter, and regulate described tar sand oil to exploit pH to 6.5 ~ 7.5 of sewage.
Preferably, the treatment time of described oil removal by air bubbling is 40 ~ 60min, and temperature is 5 ~ 60 DEG C.
Preferably, add flocculation agent in the process of described flocculation-air floating process, described flocculation agent is organic polymer coargulator and inorganic polymer flocculant.
Preferably, described organic polymer coargulator is cationic polyacrylamide; Described inorganic polymer flocculant is polymerize aluminum chloride or polyferric silicate sulfate.
Preferably, in step b), with described sewage for base, the input amount of described organic polymer coargulator is 3 ~ 20mg/L, and the input amount of described inorganic polymer flocculant is 30 ~ 80mg/L.
Present invention also offers the treatment system of a kind of tar sand oil exploitation sewage, comprise homogeneous groove, air-float degreasing device, flocculation-air floating device and whizzer; The outlet of described homogeneous groove is connected with the entrance of described air-float degreasing device, and the outlet of described air-float degreasing device is connected with the entrance of described flocculation-air floating device, and the outlet of described flocculation-air floating device is connected with the entrance of described whizzer.
Preferably, described whizzer is horizontal screw centrifuge.
The invention provides treatment process and the treatment system of a kind of tar sand oil exploitation sewage.In the process of process tar sand oil exploitation sewage, tar sand oil is exploited sewage and carried out homogenization treatment successively, oil removal by air bubbling process, flocculated suspension process and centrifugal treating, the present invention carries out homogenization treatment to tar sand oil exploitation sewage in homogeneous groove, oil in water emulsion is converted into suspension oil, again the sewage after homogenization treatment is entered air-float degreasing device and carry out oil removal by air bubbling process, by the suspension oil in sewage, oil in water emulsion is floating to the water surface, the clearance of suspension oil is made to be 85wt% ~ 95wt%, the clearance of oil in water emulsion is 5wt% ~ 10wt%, then the sewage after oil removal by air bubbling is entered flocculation-air floating device and carry out flocculation-air floating process, make suspended substance in sewage floating to sewage surface, throw out is separated with flocculation-air floating sewage, then flocculation-air floating sewage is separated in centrifuges, thus obtain oil reservoir reinjected water.Experimental result shows, in the water after tar sand oil exploitation sewage disposal of the present invention, oleaginousness is less than 20mg/L, and suspended solid is less than 20mg/L, and pH value is 6.5 ~ 7.5, meets oil reservoir reinjected water standard.
Accompanying drawing explanation
Fig. 1 is the treatment system schematic diagram of tar sand oil of the present invention exploitation sewage.
Embodiment
In order to understand the present invention further, below in conjunction with embodiment, the preferred embodiment of the invention is described, but should be appreciated that these describe just for further illustrating the features and advantages of the present invention, instead of limiting to the claimed invention.
Exploiting sewage to make tar sand oil to be fully used, can be used in oil reservoir reinjected water, the embodiment of the invention discloses the treatment process of a kind of tar sand oil exploitation sewage, comprise the following steps:
A) tar sand oil is exploited sewage and carry out homogenization treatment, the sewage after described homogenization treatment is carried out oil removal by air bubbling, make the clearance of suspension oil be 85wt% ~ 95wt%, the clearance of oil in water emulsion is 5wt% ~ 10wt%;
B) sewage step a) obtained carries out flocculation-air floating process, is separated throw out and flocculation-air floating sewage;
C) described flocculation-air floating sewage is carried out centrifugation, obtain oil reservoir reinjected water.
Exploit sewage to make tar sand oil to be fully used, tar sand oil is exploited sewage and is carried out processing the sewage after making process and be used for sands formation reinjected water by the present invention.Fig. 1 is the treatment system schematic diagram of tar sand oil of the present invention exploitation sewage.In the process of process tar sand oil exploitation sewage, first tar sand oil is exploited sewage and carry out homogenization treatment in homogeneous groove 1, wherein will be converted into suspension oil by part oil in water emulsion.Described homogenization treatment process is specially:
Tar sand oil is exploited sewage to enter in homogeneous groove 1, add pH to 6.5 ~ 7.5 that acid or alkali regulate described sewage, and add quaternary ammonium salt emulsion splitter, the described tar sand oil exploitation treatment time of sewage in homogeneous groove 1 is 40 ~ 90min, and temperature is 5 ~ 60 DEG C.
Described tar sand oil exploitation sewage is after homogenization treatment, then the tar sand oil exploitation sewage after homogenization treatment is entered air-float degreasing device 2 and carry out oil removal by air bubbling process, make the clearance of suspension oil be 85wt% ~ 90wt%, oil in water emulsion clearance is 5wt% ~ 10wt%.In the process of described oil removal by air bubbling, a large amount of microbubbles produced by the air-flotation system bottom air-float degreasing device 2, by the suspension oil in sewage, oil in water emulsion floating to sewage surface, upper strata oil slick is reclaimed by overflow port.The time of described oil removal by air bubbling process is preferably 40 ~ 60min, and temperature is preferably 5 ~ 60 DEG C.
Tar sand oil exploitation sewage through oil removal by air bubbling process enters flocculation-air floating device 3, carries out flocculation-air floating process.Preferably flocculation agent is added in the process of flocculation-air floating process; Described flocculation agent is preferably inorganic polymer flocculant and organic polymer coargulator; Described inorganic polymer flocculant is preferably polymerize aluminum chloride system inorganic polymer flocculant or polymeric silicicacid Ferrite inorganic polymer flocculant; Described organic polymer coargulator is organic polymer coargulator well known to those skilled in the art, is preferably cationic polyacrylamide.Flocculating agent molecule amount of the present invention is preferably 8,000,000 ~ 2,500 ten thousand, regulates the molecular weight of flocculation agent by synthesis technique, makes flocculation agent and pending polymer, the molecular weight of organic macromolecule matches, have wide spectrum suitability.By adjusting the composite use of flocculating agent molecule amount and organic floculant and inorganic flocculating agent, effectively can remove the suspended substance in waste water, various petroleum assistant and metal ion etc., successful is better than conventional water treatment agent.
In the process of flocculation-air floating process, the sewage after oil removal by air bubbling enters in the mixing reactor of flocculation-air floating device, adds flocculation agent simultaneously, forms separable throw out; Enter air-floating apparatus through pretreated sewage to mix with the dissolved air water that air dissolved pump provides, the bubble adhesion that dissolved air water is discharged is on throw out, flocculation agent, sewage fully mix and form a large amount of throw outs by bubble, throw out at the effect float downward of microbubble to the water surface, form scum silica frost, then by the slag scraper of flocculation-air floating device, described scum silica frost is received to storing up slag chute.
Finally adopt whizzer 4 to be separated flocculation-air floating water outlet, described whizzer 4 is preferably horizontal screw centrifuge.Solid waste centralized recovery after centrifugation, for slurries additive agent, the water outlet after centrifugation is used for oil reservoir reinjected water.
The invention provides treatment process and the treatment system of a kind of tar sand oil exploitation sewage.In the process of process tar sand oil exploitation sewage, tar sand oil is exploited sewage and carried out homogenization treatment successively, oil removal by air bubbling process, flocculated suspension process and centrifugal treating, the present invention carries out homogenization treatment to tar sand oil exploitation sewage in homogeneous groove, oil in water emulsion is converted into suspension oil, again the sewage after homogenization treatment is entered air-float degreasing device and carry out oil removal by air bubbling process, by the suspension oil in sewage, oil in water emulsion is floating to the water surface, the clearance of suspension oil is made to be 85wt% ~ 95wt%, the clearance of oil in water emulsion is 5wt% ~ 10wt%, then the sewage after oil removal by air bubbling is entered flocculation-air floating device and carry out flocculation-air floating process, make suspended substance in sewage floating to sewage surface, throw out is separated with flocculation-air floating sewage, then flocculation-air floating sewage is separated, thus obtain oil reservoir reinjected water.Experimental result shows, in the water after tar sand oil exploitation sewage disposal of the present invention, oleaginousness is less than 20mg/L, and suspended solid is less than 20mg/L, and pH value is 6.5 ~ 7.5, meets oil reservoir reinjected water standard.
Present invention also offers the treatment system of a kind of tar sand oil exploitation sewage, described treatment system comprises homogeneous groove 1, air-float degreasing device 2, flocculation-air floating device 3 and whizzer 4; The outlet of described homogeneous groove 1 is connected with the entrance of described air-float degreasing device 2, and the outlet of described air-float degreasing device 2 is connected with the entrance of described flocculation-air floating device 3, and the outlet of described flocculation-air floating device 3 is connected with the entrance of described whizzer 4.
The present invention adopts above-mentioned treatment system to process tar sand oil exploitation sewage.First tar sand oil exploitation sewage enter homogeneous groove 1 and carry out homogenization treatment, and the oil in water emulsion in described tar sand oil exploitation sewage is partially converted into suspension oil; Then the sewage after homogenization treatment is entered air-float degreasing device 2, described air-float degreasing device 2 is air-float degreasing device well known to those skilled in the art, and the present invention has no particular limits.In air-float degreasing device 2, after treatment, the clearance of suspension oil is 85wt% ~ 90wt% to the sewage after homogeneous, and the clearance of oil in water emulsion is 5wt% ~ 10wt%.
Tar sand oil exploitation sewage enters flocculation-air floating device 3 after oil removal by air bubbling, and described flocculation-air floating device 3 preferably includes mixing reactor, air-floating apparatus, slag scraper and storage slag chute.Described flocculation-air floating device 3 is preferably pressure air-dissolving air-float system that Beijing Botong Haina Petroleum Technology Co., Ltd provides or the two-stage air flotation oil remover that Liaoning Huafu Environment Engineering Co., Ltd. provides.
Finally the water outlet of outstanding solidifying air-flotation process is entered whizzer 4 and carry out centrifugation, the solid waste after centrifugation reclaims for making slurries additive agent, and the water outlet after centrifugation is used for oil reservoir reinjected water.
In order to understand the present invention further, be described in detail to the treatment process of tar sand oil exploitation sewage provided by the invention and treatment system below in conjunction with embodiment, protection scope of the present invention is not limited by the following examples.
Embodiment 1
The composition with weakly alkaline tar sand oil exploitation waste water is as shown in table 1, and table 1 is the composition of tar sand oil exploitation waste water.Tar sand oil is exploited waste water and first enter homogeneous groove 1, in homogeneous groove 1, add hydrochloric acid adjustment wastewater pH to 6.5 ~ 7.5 of 50 ~ 500ppm, oil in water emulsion is converted into suspension oil by the quaternary ammonium salt emulsion splitter adding 20 ~ 100ppm, and working temperature is 60 DEG C.Waste water after homogeneous hydraulic retention 40 minutes in air-float degreasing device 2, working temperature is 40 DEG C.Flocculation-air floating device 3 is entered in water outlet after oil removal by air bubbling process, adds 30 ~ 80mg/L polymerize aluminum chloride system's inorganic polymer flocculant and 3 ~ 20mg/L organic polymer coargulator respectively, and hydraulic detention time is 10 minutes.
Flocculation-air floating water outlet enters whizzer 4 and carries out centrifugation, and the solid waste centralized recovery that centrifugation produces is for making slurries additive agent, and the water after centrifugation is used for oil reservoir reinjected water.The oleaginousness of described oil reservoir reinjected water is less than 20mg/L, and suspended solid is less than 20mg/L, pH value 6.5 ~ 7.5, meets oil reservoir reinjected water standard.
The main component of table 1 tar sand oil exploitation sewage
| Sewage/index | Oleaginousness (mg/L) | Suspended substance (mg/L) | pH |
| Tar sand oil exploitation sewage | 300～5000 | 0～1000 | 3～10 |
Embodiment 2
Have highly acid acidified waste water and first enter homogeneous groove 1, add the common alkali adjustment wastewater pH of 200 ~ 1000ppm to 6.5 ~ 7.5, add the quaternary ammonium salt emulsion splitter of 20 ~ 100ppm so that oil in water emulsion is converted into suspension oil, working temperature is 30 DEG C.Waste water after homogeneous hydraulic retention 50 minutes in air-float degreasing device 2, working temperature is 30 DEG C.Flocculation-air floating device 3 is entered in oil removal by air bubbling water outlet, adds 30 ~ 80mg/L polymeric silicicacid Ferrite inorganic polymer flocculant and 3 ~ 20mg/L organic polymer coargulator respectively, and hydraulic detention time is 10 minutes.
Flocculation-air floating water outlet enters horizontal screw centrifuge 4 and carries out centrifugation, and the solid waste centralized recovery that centrifugation produces is for making slurries additive agent, and the water outlet after process is used for oil reservoir reinjected water.The oleaginousness of described oil reservoir reinjected water is less than 20mg/L, and suspended solid is less than 20mg/L, pH value 6.5 ~ 7.5, meets oil reservoir reinjected water standard.
Embodiment 3
Have weakly alkaline waste liquid and first enter homogeneous groove 1, add the common acid adjustment wastewater pH of 50 ~ 500ppm to 6.5 ~ 7.5, add the quaternary ammonium salt emulsion splitter of 20 ~ 100ppm so that oil in water emulsion is converted into suspension oil, working temperature is 10 DEG C.Waste water after homogeneous hydraulic retention 50 minutes in air-float degreasing device 2, working temperature is 20 DEG C.Flocculation-air floating device 3 is entered in oil removal by air bubbling water outlet, adds 30 ~ 80mg/L polymeric silicicacid Ferrite inorganic polymer flocculant and 3 ~ 20mg/L organic polymer coargulator respectively, and hydraulic detention time is 5 minutes.Flocculation-air floating water outlet enters whizzer 4 centrifugation, and the solid waste centralized recovery that centrifugation produces is for making slurries additive agent, and the water outlet after centrifugation is as oil reservoir reinjected water.The oleaginousness of oil reservoir reinjected water is less than 20mg/L, and suspended solid is less than 20mg/L, pH value 6.5 ~ 7.5, meets oil reservoir reinjected water standard.
The explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (7)
1. a treatment process for tar sand oil exploitation sewage, comprises the following steps:
A) tar sand oil is exploited sewage and carry out homogenization treatment in homogeneous groove, sewage after homogenization treatment is entered air-float degreasing device and carries out oil removal by air bubbling process, make the clearance of suspension oil be 85wt% ~ 95wt%, the clearance of oil in water emulsion is 5wt% ~ 10wt%;
B) sewage that step a) obtains is entered flocculation-air floating device and carry out flocculation-air floating process, be separated throw out and flocculation-air floating sewage;
C) described flocculation-air floating sewage is carried out centrifugation, obtain oil reservoir reinjected water;
Described homogenization treatment is specially: described tar sand oil exploitation sewage is entered homogeneous groove, adds emulsion splitter, and regulate described tar sand oil to exploit pH to 6.5 ~ 7.5 of sewage;
Described emulsion splitter is quaternary ammonium salt emulsion splitter.
2. treatment process according to claim 1, is characterized in that, the treatment time of described oil removal by air bubbling is 40 ~ 60min, and temperature is 5 ~ 60 DEG C.
3. treatment process according to claim 1, is characterized in that, adds flocculation agent in the process of described flocculation-air floating process, and described flocculation agent is organic polymer coargulator and inorganic polymer flocculant.
4. treatment process according to claim 3, is characterized in that, described organic polymer coargulator is cationic polyacrylamide; Described inorganic polymer flocculant is polymerize aluminum chloride or polyferric silicate sulfate.
5. treatment process according to claim 3, is characterized in that, step b) in, with described sewage for base, the input amount of described organic polymer coargulator is 3 ~ 20mg/L, and the input amount of described inorganic polymer flocculant is 30 ~ 80mg/L.
6. a treatment system for the treatment process of tar sand oil exploitation sewage as claimed in claim 1, comprises homogeneous groove, air-float degreasing device, flocculation-air floating device and whizzer; The outlet of described homogeneous groove is connected with the entrance of described air-float degreasing device, and the outlet of described air-float degreasing device is connected with the entrance of described flocculation-air floating device, and the outlet of described flocculation-air floating device is connected with the entrance of described whizzer.
7. treatment system according to claim 6, is characterized in that, described whizzer is horizontal screw centrifuge.
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| CA2556357A1 (en) * | 2005-08-19 | 2007-02-19 | David C. Burt | Portable oil field waste water treatment and recycling system |
| US7517448B2 (en) * | 2005-07-28 | 2009-04-14 | Chen Tony C T | Recycling cool water filter |
| CN101591110A (en) * | 2008-05-29 | 2009-12-02 | 中国石油化工股份有限公司 | A kind of oil refining sewage treatment technology |
| CN102491553A (en) * | 2011-11-29 | 2012-06-13 | 成都晶宝科技有限公司 | Oilfield produced water treatment system and oilfield produced water treatment method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7517448B2 (en) * | 2005-07-28 | 2009-04-14 | Chen Tony C T | Recycling cool water filter |
| CA2556357A1 (en) * | 2005-08-19 | 2007-02-19 | David C. Burt | Portable oil field waste water treatment and recycling system |
| CN101591110A (en) * | 2008-05-29 | 2009-12-02 | 中国石油化工股份有限公司 | A kind of oil refining sewage treatment technology |
| CN102491553A (en) * | 2011-11-29 | 2012-06-13 | 成都晶宝科技有限公司 | Oilfield produced water treatment system and oilfield produced water treatment method |
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