CN103466895A - Advanced treatment system of polymer oilfield wastewater - Google Patents
Advanced treatment system of polymer oilfield wastewater Download PDFInfo
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- CN103466895A CN103466895A CN2013104424338A CN201310442433A CN103466895A CN 103466895 A CN103466895 A CN 103466895A CN 2013104424338 A CN2013104424338 A CN 2013104424338A CN 201310442433 A CN201310442433 A CN 201310442433A CN 103466895 A CN103466895 A CN 103466895A
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Abstract
The invention relates to an advanced treatment system of polymer oilfield wastewater, belonging to the technical field of wastewater treatment. The advanced treatment system of polymer oilfield wastewater comprises an oil separation mechanism, a buffer mechanism, an ozone air floatation mechanism, a cyclic treatment reaction mechanism and a membrane bio-reactor (MBR), wherein oil and water from the oil separation mechanism are naturally separated and enter the buffer mechanism; the wastewater from the buffer mechanism enters the ozone air floatation mechanism after being homogenized and quantified evenly; the ozone air floatation mechanism is provided with a contact zone, a separation zone, an effluent zone, a slagging zone and an effluent pipeline; the wastewater enters the cyclic treatment reaction mechanism after undergoing triple actions including flocculation, ozonization and air floatation; the cyclic treatment reaction mechanism is provided with a biological selector, a main reaction zone, a water gathering zone, a sludge reflux pipeline and an aeration pipeline; the MBR is provided with a membrane module, an effluent pipeline and an aeration pipeline; the wastewater is discharged outwards after undergoing biotreatment and membrane separation carried out by the MBR. The advanced treatment system has the advantages of high treatment efficiency, good effluent quality, compact structure, small floor area, efficiency, energy conservation and the like.
Description
Technical field
The invention belongs to technical field of sewage, particularly relate to a kind of polymkeric substance oil extraction-generated waste water advanced treatment system.
Background technology
At present, oil field enters the oil production middle and later periods, and polymer displacement of reservoir oil tech is used widely in oil field.The polymkeric substance oil extraction-generated waste water has that the water yield is large, complicated component and reluctant characteristics, wherein high viscosity, strong emulsifying stability and biodegradability are poorer is its principal character that is different from other oil extraction-generated waste water, makes the processing power at built oily water treatment station, oil field significantly descend.Along with environmental consciousness improves, is becoming tight water resources day, the oily water treatment technology faces a severe challenge simultaneously, and its development plays a part very important to the survival and development in oil field.
Existing refinery oily water treatment is most of to be adopted " oil removal oil removing-air supporting (or coagulation, precipitation)-biochemistry " three sections treatment process, then be aided with scale inhibition, inhibition, sterilization, film is processed or physico-chemical processes processing etc., although method has certain effect, also there are a lot of problems in " old three cover ", as oil trap, can only remove the oil droplet of large particle diameter, can not remove oil in water emulsion and dissolving oil in water; By Bubble-floating Method adopts air as source of the gas, and treatment effect reaches capacity within the specific limits, can not reach the biochemistry water inlet requirement of high-concentration sewage; After the leading portion materialization is processed, the COD of oil-contaminated water of oil field is generally at 300～500mg/L, but the organism in sewage belongs to recalcitrant substance, and in sewage, saltiness is high, and biodegradability is poor, so the effect that biochemical process is processed oil-contaminated water of oil field is not very desirable.With conventional water treatment process, compare, the membrane separation technique effluent quality is better, without adding chemical agent, level of automation is high, floor space is little, but, along with increase working time, membrane flux descends at double, make effluent quality worsen and need carry out high-frequency cleaning, final running cost and initial cost are high.All there be " secondary pollution " in these technology and invest the technical problems such as large.
Summary of the invention
The present invention provides a kind of polymkeric substance oil extraction-generated waste water advanced treatment system for solving the technical problem existed in known technology.
The purpose of this invention is to provide that a kind of to have a processing efficiency high, effluent quality is good, and there is the system architecture compactness, floor space is little, automatization is controlled, the polymkeric substance oil extraction-generated waste water advanced treatment system of the characteristics such as energy-efficient.
The present invention is directed to the problems such as existing oily(waste)water biochemical treatment system floor space is large, sludge bulking, Nitrogen/Phosphorus Removal is undesirable, the cycle of operation is long, adopt cyclic activated sludge technology (CAST technique) as the one-level biochemical treatment.CAST technique collection aeration be deposited in same pond, characteristics of compact layout, take up an area to economize.Sewage is access mechanism in batches, by aeration, precipitation, draining, idle four-stage, completes an operational cycle, and the length in each stage all can be adjusted flexibly according to the variation of water inlet, effluent quality and sewage quantity, and water resistant matter, water yield impact capacity are larger.CAST mechanism front end arranges biological selector, and at first the ozone air-float water enters biological selector, with the active sludge refluxed from main reaction region, mixes, and reduces the entering organic matter of water change in concentration, selects the beneficial organism flora, effectively prevents sludge bulking, and treatment effect is good.CAST mechanism anoxic and aerobic hocketing, can better realize denitrogenation dephosphorizing.
Membrane bioreactor (MBR) is a kind of high-efficiency sewage New Process for Treatment that biological treatment combines with membrane sepn and forms.Its principle of work is the organic pollutant utilized in the aerobic degradation sewage of reactor, utilize nitrobacteria in reactor to transform the ammonia nitrogen in sewage simultaneously, crown_interception by film, maintain high biomass concentration, improve volume load, reduce sludge loading, there is extremely strong impact resistance, and surplus sludge volume is few.The MBR effluent quality is better, and without adding chemical agent, level of automation is high, and floor space is little, but MBR has strict requirement to influent quality especially oleaginousness.Given this, after the present invention is arranged on ozone air-float technique and CAST technique by MBR technique, the polymkeric substance oily(waste)water is after the flocculation of ozone air-float mechanism, ozonize and air supporting triple role and the biochemical treatment of CAST mechanism, effluent quality can meet the influent quality requirement of MBR, effectively controlling diaphragm pollutes, and guarantees effluent quality, has reduced cleaning frequency simultaneously, increase membrane lifetime, thereby reduced cost.MBR mechanism arranges the back flushing pipeline, and a part of water outlet enters in the MBR film and rinses fenestra through the back flushing pipeline, makes fenestra unobstructed, and necessary back flushing has reduced the replacing number of times of MBR film, has simplified the backwash treating processes, has saved cost.
Controlling System is selected the PLC controller.PLC is a kind of specially for apply the electronic mechanism of the digital operation operation designed under industrial environment.It adopts the storer that can program, the section within it that is used for stores the instruction that actuating logic computing, sequential operation, timing, counting and arithmetical operation etc. operate, and can, by digital or analog input and output, control various types of machinery or production process.
The technical scheme that polymkeric substance oil extraction-generated waste water advanced treatment system of the present invention is taked is:
A kind of polymkeric substance oil extraction-generated waste water advanced treatment system is characterized in: treatment system comprises oil removal mechanism, buffer gear, ozone air-float mechanism, circular treatment reaction mechanism and membrane bioreactor; Oil removal mechanism is provided with inlet channel and outlet conduit, and the polymkeric substance oil extraction-generated waste water enters oil removal mechanism through inlet channel, and after the profit natural separation, sewage enters buffer gear through outlet conduit; Buffer gear is provided with outlet conduit, and the sewage of buffer gear passes through homogeneous, all measures by outlet conduit and enter ozone air-float mechanism; Ozone air-float mechanism is provided with zone of action, disengaging zone, exhalant region, dreg discharging area and outlet conduit, and sewage enters exhalant region and enters the circular treatment reaction mechanism through outlet conduit after flocculation, ozonize and air supporting triple role, and the dregs of fat enter dreg discharging area and discharge; The circular treatment reaction mechanism is provided with biological selector, main reaction region, catchment area, sludge return pipe and aerated conduit, sewage is processed and is entered membrane bioreactor by outlet conduit through circular treatment reaction mechanism de-carbon, denitrogenation dephosphorizing, aerated conduit provides oxygen for circular treatment reaction mechanism biological respinse, and active sludge is back to biological selector so that the selective advantage bacterial classification by main reaction region through sludge return pipe; Membrane bioreactor is provided with membrane module, outlet conduit and aerated conduit, and sewage effluxes by outlet conduit through membrane bioreactor biological treatment and membrane sepn, and aerated conduit provides oxygen and film is carried out to air purge for biological respinse.
Polymkeric substance oil extraction-generated waste water advanced treatment system of the present invention can also adopt following technical scheme:
Described polymkeric substance oil extraction-generated waste water advanced treatment system, be characterized in: oil removal mechanism is provided with flowline, and polymkeric substance oil extraction-generated waste water sump oil after oil removal mechanism carries out the profit natural separation is discharged through flowline.Oil removal mechanism is the relative density difference utilized between oil and water, by elaioleucite, naturally floats to the water surface, the method for then oil being removed, but be mainly used in removing the larger thick dispersiveness oil slick grain of diameter in sewage.
Described polymkeric substance oil extraction-generated waste water advanced treatment system, be characterized in: ozone air-float mechanism is provided with Residue extraction pipeline, and the dregs of fat enter dreg discharging area and discharge through Residue extraction pipeline.Ozone air-float mechanism usings ozone and replaces air as molten gas source of the gas, inner release of separator, produces even ozone microbubble, realizes contacting adhesion and, to the oxidising process of pollutent, finally completing dissolved air flotation of ozone bubbles and pollutent simultaneously.
Described polymkeric substance oil extraction-generated waste water advanced treatment system, be characterized in: the circular treatment reaction mechanism unites two into one aeration tank and settling tank, be that biochemical reaction and mud-water separation are carried out in one reaction pool, sewage is access mechanism in batches, complete an operational cycle by aeration, precipitation, draining, idle four-stage, mechanism's front end arranges biological selector.
Described polymkeric substance oil extraction-generated waste water advanced treatment system, be characterized in: membrane bioreactor is provided with the back flushing pipeline, and membrane module is carried out to back flushing.Membrane bioreactor combines membrane separation technique with biologic treating technique, high to the clearance of pollutent, and anti-soil mud swelling capacity is strong, denitrogenation dephosphorizing, and stable effluent quality is reliable, removes SS, turbidity, bacterium and virus etc.
Advantage and positively effect that the present invention has are:
Polymkeric substance oil extraction-generated waste water advanced treatment system is owing to having adopted the brand-new technical scheme of the present invention, compared with prior art, the present invention is directed to characteristics and By Bubble-floating Method limitation in the oily water treatment process such as polymkeric substance oil extraction-generated waste water complicated component, high viscosity, strong emulsifying stability and biodegradability be poorer, utilize ozone to replace air to be combined with air supporting.Ozone has extremely strong oxidation, is only second to fluorine, higher than chlorine and potassium permanganate, but and ozone decomposition voluntarily in the short period of time in water, there is no secondary pollution.By high pressure solution gas, increase the dissolving of ozone in water, improve the ozone effective rate of utilization, and making conventional liquid-gas interface oxidation conversion is the oxidation in the liquid liquid system, strengthened the effect of mass transmitting of ozone gas and polymkeric substance and other pollutents, thereby improved pneumatically supported removal efficiency, met biochemical water inlet requirement.
What the present invention is directed to polymkeric substance exists severe jamming flocculation agent result of use, make the throwing out variation, greatly increased the problem of the consumption of medicament, utilize ozone strong oxidizing to make the partial polymer oxygenolysis become the small organic molecule of easy biochemical degradation, and in ozone air-float mechanism, zone of action being set makes fully to contact adhesion from the polymkeric substance oil extraction-generated waste water of Buffer Pool with the ozone dissolved air water, not only cause effective pre-ozonation, and enhanced flocculation effect in the process risen at current, reduce the dosage of flocculation agent and control secondary pollution.
The accompanying drawing explanation
Fig. 1 is polymkeric substance oil extraction-generated waste water advanced treatment system structural representation of the present invention.
In figure, 1-oil removal mechanism, the 2-buffer gear, 3-ozone air-float mechanism, 4-CAST mechanism, 5-MBR mechanism, the 6-reliever, the 7-zone of action, the 8-disengaging zone, the 9-exhalant region, the 10-dreg discharging area, the 11-biological selector, the 12-main reaction region, the 13-catchment area, the 14-MBR membrane module, the g1-inlet channel, g2-oil removal mechanism outlet conduit, g3-buffer gear outlet conduit, g4-ozone air-float outlet conduit, g5-CAST mechanism outlet conduit, the g6-outlet conduit, the g7-flowline, the g8-Residue extraction pipeline, g9-dissolved air water pipeline, the g10-sludge return pipe, g11-CAST mechanism aerated conduit, g12-back flushing pipeline, g13-MBR mechanism aerated conduit.
Embodiment
For further understanding summary of the invention of the present invention, Characteristic, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
Consult accompanying drawing 1.
Embodiment 1
A kind of polymkeric substance oil extraction-generated waste water treatment system, comprise oil removal mechanism, buffer gear, ozone air-float mechanism, circular treatment reaction mechanism and membrane bioreactor.Described oil removal mechanism is provided with inlet channel, flowline and outlet conduit, and the polymkeric substance oil extraction-generated waste water enters oil removal mechanism through inlet channel, and after the profit natural separation, sump oil is discharged through flowline, and sewage enters buffer gear through outlet conduit.Described buffer gear is provided with outlet conduit, and the sewage of buffer gear passes through homogeneous, all measures by outlet conduit and enter ozone air-float mechanism.Zone of action, disengaging zone, exhalant region, dreg discharging area, Residue extraction pipeline, dissolved air water pipeline, outlet conduit that described ozone air-float mechanism is provided with, sewage enters exhalant region and enters the circular treatment reaction mechanism through outlet conduit after flocculation, ozonize and air supporting triple role, and the dregs of fat enter dreg discharging area and discharge through Residue extraction pipeline.Biological selector, main reaction region, catchment area, sludge return pipe and aerated conduit that described circular treatment reaction mechanism is provided with, sewage is processed and is entered membrane bioreactor by outlet conduit through circular treatment reaction mechanism de-carbon, denitrogenation dephosphorizing, aerated conduit provides essential oxygen for biological respinse, and active sludge is back to biological selector so that the selective advantage bacterial classification by main reaction region through sludge return pipe.Described membrane bioreactor is provided with membrane module, outlet conduit, aerated conduit and back flushing pipeline, sewage is through membrane bioreactor biological treatment and membrane sepn by the outlet conduit standard discharge, and aerated conduit carries out air purge to film for biological respinse provides essential oxygen simultaneously.
The concrete structure of the present embodiment and working process thereof:
As shown in Figure 1.A kind of polymkeric substance oil extraction-generated waste water advanced treatment system, comprise oil removal mechanism 1, buffer gear 2, ozone air-float mechanism 3, CAST mechanism 4, MBR mechanism 5.Described oil removal mechanism 1 is provided with inlet channel g1, flowline g7 and the outlet conduit g2 of oil removal mechanism.Described buffer gear 2 is provided with buffer gear outlet conduit g3.Described ozone air-float mechanism 3 is provided with zone of action 7, disengaging zone 8, exhalant region 9 and dreg discharging area 10, Residue extraction pipeline g8, dissolved air water pipeline g9, outlet conduit g4.Described CAST mechanism 4 is provided with biological selector 11, main reaction region 12, water collecting basin 13, sludge return pipe g10 and aerated conduit g11.Described MBR mechanism 5 is provided with MBR membrane module 14, outlet conduit g6, back flushing pipeline g12 and aerated conduit g13.Described oil removal mechanism 1 is connected with the buffer gear water-in by outlet conduit g2, described buffer gear 2 is connected with ozone air-float mechanism water-in by outlet conduit g3, described ozone air-float mechanism 3 is connected with CAST mechanism water-in by outlet conduit g4, and described CAST mechanism 4 passes through outlet conduit g5 and is connected with MBR mechanism water-in.
Certain field polymers oily(waste)water enters oil removal mechanism 1 through inlet channel g1, and the sewage in oil removal mechanism 1 is after the profit natural separation, and the dregs of fat are discharged through flowline g7, and sewage enters buffer gear 2 through the outlet conduit g2 of oil removal mechanism.Sewage in buffer gear 2 passes through homogeneous, all measures by buffer gear outlet conduit g3 and enter ozone air-float mechanism 3.The ozone dissolved air water is discharged with the sewage of coming in from buffer gear and 7 is adhered to and oxidation in zone of action through reliever 6 by dissolved air water pipeline g9, the particle floating that has adhered to small bubbles forms scum silica frost and 8 is separated in disengaging zone, sewage enters exhalant region 9 and enters CAST mechanism 4 through the outlet conduit g4 of ozone air-float mechanism, and the dregs of fat enter dreg discharging area 10 and discharge through Residue extraction pipeline g8.The biological selector 11 that at first sewage in CAST mechanism 4 enter front end mixes with the active sludge refluxed by main reaction region 12 through sludge return pipe g10, bacterial classification is fully contacted with nitrogen, phosphorus with the organism in raw waste water, then entering main reaction region 12 is carried out a biological disposal upon, sewage after processing enters catchment area 13 and enters MBR mechanism 5 through the outlet conduit g5 of CAST mechanism, and the aerated conduit g11 of CAST mechanism 4 provides essential oxygen for the biological treatment of CAST technique.The sewage of MBR mechanism 5 is processed by outlet conduit g6 standard discharge through MBR, the part water outlet enters in MBR membrane module 14 and rinses fenestra through back flushing pipeline g12, make fenestra unimpeded, the aeration g13 of MBR mechanism 5 is cleaned film for biological respinse provides essential oxygen simultaneously.
Oil removal mechanism is the relative density difference utilized between oil and water, by elaioleucite, naturally floats to the water surface, the method for then oil being removed, but be mainly used in removing the larger thick dispersiveness oil slick grain of diameter in sewage; Ozone replacement air is usingd as molten gas source of the gas in ozone air-float mechanism, produce even ozone microbubble inner release of separator, realize that contacting of ozone bubbles and pollutent adheres to simultaneously and, to the oxidising process of pollutent, finally complete dissolved air flotation, meet biochemical water inlet requirement.CAST mechanism unites two into one aeration tank and settling tank, be that biochemical reaction and mud-water separation are carried out in one reaction pool, sewage is access mechanism in batches, complete an operational cycle by aeration, precipitation, draining, idle four-stage, mechanism's front end arranges the preferred flora of biological selector, effectively prevent sludge bulking, treatment effect is good, meets MBR water inlet requirement.MBR mechanism combines membrane separation technique with biologic treating technique, high to the clearance of pollutent, and anti-soil mud swelling capacity is strong, denitrogenation dephosphorizing, and stable effluent quality is reliable, removes SS, turbidity, bacterium and virus etc.
The present invention adopts PLC to control the running of each mechanism and the switching of each pipeline, guarantees the each several part coordinate operation.
The present embodiment has been realized polymkeric substance oily(waste)water advanced treatment, has a described processing efficiency high, and effluent quality is good, and this system architecture is compact, floor space is little, automatization is controlled, the actively effect such as energy-efficient.
Claims (5)
1. a polymkeric substance oil extraction-generated waste water advanced treatment system, it is characterized in that: treatment system comprises oil removal mechanism, buffer gear, ozone air-float mechanism, circular treatment reaction mechanism and membrane bioreactor; Oil removal mechanism is provided with inlet channel and outlet conduit, and the polymkeric substance oil extraction-generated waste water enters oil removal mechanism through inlet channel, and after the profit natural separation, sewage enters buffer gear through outlet conduit; Buffer gear is provided with outlet conduit, and the sewage of buffer gear passes through homogeneous, all measures by outlet conduit and enter ozone air-float mechanism; Ozone air-float mechanism is provided with zone of action, disengaging zone, exhalant region, dreg discharging area, outlet conduit, and sewage enters exhalant region and enters the circular treatment reaction mechanism through outlet conduit after flocculation, ozonize and air supporting triple role, and the dregs of fat enter dreg discharging area and discharge; The circular treatment reaction mechanism is provided with biological selector, main reaction region, catchment area and aerated conduit, sewage is processed and is entered membrane bioreactor by outlet conduit through circular treatment reaction mechanism de-carbon, denitrogenation dephosphorizing, and aerated conduit provides oxygen for circular treatment reaction mechanism biological respinse; Membrane bioreactor is provided with membrane module, outlet conduit and aerated conduit, and sewage effluxes by outlet conduit through membrane bioreactor biological treatment and membrane sepn, and aerated conduit carries out air purge to film for biological respinse provides oxygen simultaneously.
2. polymkeric substance oil extraction-generated waste water advanced treatment system according to claim 1, it is characterized in that: oil removal mechanism is provided with flowline, and polymkeric substance oil extraction-generated waste water sump oil after oil removal mechanism carries out the profit natural separation is discharged through flowline.
3. polymkeric substance oil extraction-generated waste water advanced treatment system according to claim 1, it is characterized in that: ozone air-float mechanism is provided with Residue extraction pipeline, and the dregs of fat enter dreg discharging area and discharge through Residue extraction pipeline.
4. polymkeric substance oil extraction-generated waste water advanced treatment system according to claim 1, it is characterized in that: circular treatment mechanism is provided with sludge return pipe, and active sludge is back to biological selector by main reaction region.
5. polymkeric substance oil extraction-generated waste water advanced treatment system according to claim 1, it is characterized in that: membrane bioreactor is provided with the back flushing pipeline, and membrane module is carried out to back flushing.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106277627A (en) * | 2016-08-31 | 2017-01-04 | 宜兴市欧亚华都环境工程有限公司 | A kind of high concentration hard-degraded organic waste water processing equipment |
| CN108218060A (en) * | 2018-03-27 | 2018-06-29 | 大连交通大学 | Purification uses emulsion integral system and method online |
| CN112010459A (en) * | 2020-08-10 | 2020-12-01 | 陕西优斯达环境科技有限公司 | Treatment device and treatment method for oilfield produced water |
| CN112645538A (en) * | 2020-12-14 | 2021-04-13 | 安徽纬纶环保科技有限公司 | Well-flushing waste liquid integrated treatment device |
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| CN102107998A (en) * | 2011-01-14 | 2011-06-29 | 武汉江扬水技术工程有限公司 | Method for treating low-permeability oilfield reinjection water |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106277627A (en) * | 2016-08-31 | 2017-01-04 | 宜兴市欧亚华都环境工程有限公司 | A kind of high concentration hard-degraded organic waste water processing equipment |
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| CN112010459A (en) * | 2020-08-10 | 2020-12-01 | 陕西优斯达环境科技有限公司 | Treatment device and treatment method for oilfield produced water |
| CN112645538A (en) * | 2020-12-14 | 2021-04-13 | 安徽纬纶环保科技有限公司 | Well-flushing waste liquid integrated treatment device |
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