CN1339409A - Condensed oil waste water deep treating and reusing technology - Google Patents
Condensed oil waste water deep treating and reusing technology Download PDFInfo
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Abstract
The condensed oil waste water deep treating and reusing technology includes the technological measures of eliminating oil, eliminating suspended matter, eliminating silicon, softening slurry dewatering, etc. The oil field waste water after being deep treated may be used for refilling to low permeation oil field and in hot oil extraction boiler, and this realizes zero drainage of condensed oil waste water, protects water environment, and reaches the enclosed circulation and dynamic balance of water system in oil field. With low cost and high treating effect, the technology may be used widely in waste water treatment and reuse in oil field.
Description
The invention provides the condensed oil sewage advanced treatment and the reuse technology of a kind of disposing polluted water in oil and reuse.
Along with oilfield exploitation enters the middle and later periods, the water content in crude oil of extraction is up to 60-70%, and a large amount of oily(waste)waters is discharged to the waste that causes water resources and oily resource in the water surrounding.With the Liaohe Oil Field is example, and the oily(waste)water that produces every day of this oil field is about 150,000 tons mainly with re-injection or return the mode of mixing and consume oily(waste)water at present, and the residue sewage discharge causes environmental pollution.Produced-water reinjection is to fill up the purpose that reaches raising crude oil output because of stratum deficit after the Oil extraction with the increase reservoir pressure in the Oil extraction process.In viscous oil recovery, mostly use the thermal recovery mode at present, therefore, need that condensed oil sewage is carried out advanced treatment and reach re-injection (return and mix) and gas injection boiler feed water standard, realize condensed oil sewage zero release and oily(waste)water resource utilization.Condensed oil sewage is different from light oil, thin oil sewage, the maximum difference of it and conventional oily(waste)water is condensed oil sewage water temperature height, specific gravity of crude and water are approaching, the oil content of wastewater height, characteristics such as contained sump oil viscosity is big, and is mobile poor, and emulsification is serious, therefore, the advanced treatment of condensed oil sewage and reuse technology are international difficult problems always.The domestic research of always carrying out this respect at present, scientific and technical personnel are mostly studying aspect water purification agent and the emulsion splitter, and for the advanced treatment of condensed oil sewage and the research of reuse technology aspect seldom.To in the treatment process for sewage in oil field research a small amount of report being arranged also, they remove the COD technology with biological treatment, ozone, dioxide peroxide oxidation style, think because the condensed oil sewage complicated component, single chemical oxidizing agent makes COD standard discharge difficulty, also have methods such as big jar precipitation, they have the working cost height, shortcomings such as management inconvenience.Condensed oil sewage advanced treatment and reuse technology are not reported by retrieval.
At above-mentioned the problems of the prior art, the objective of the invention is to overcome deficiency of the prior art, and a kind of condensed oil sewage advanced treatment and reuse technology are provided, solved the problem of above-mentioned existence preferably through test, respond well.
The present invention is achieved in that the contriver is at a condensed oil sewage advanced treatment and a reuse technology difficult problem, through the research of technique more than 3 years, from oil removing, remove suspended substance, silica removal, softening, five technical barriers of sludge dewatering are studied, and have finished condensed oil sewage advanced treatment and reuse technology (as Fig. 1, Fig. 2).Narrate below in conjunction with accompanying drawing:
Oil removal, adjusting: the big jar of field joint stations sewage disposal steel commonly used is as slurry tank, it has advantages such as easy construction, high insulating effect, shortcoming is that big jar is perishable, cost is high, water pump lifting lift height, big jar is in sealed state, be difficult to observe a jar interior effect of settling, change it into reinforced-concrete construction thing through experimental study.At coming very big, the extremely uneven problem of water variation water quality, oil trap has adopted the constant device of water level, has developed a kind of viscous crude collection device on the experimental study basis, and changed conventional be adjusted in preceding, oil removal after water technology.At first but the major part oil slick is collected removal in oil trap, only allow oil in water emulsion to enter equalizing tank, to guarantee the safe operation of subsequent disposal structures.In the viscous crude collection device, increased heat-conducting oil heating system, this system only heats the top layer viscous crude, make the heavy oil tested layer upper strata of formation flow to oil trap through the heating viscosity reduction, the viscous crude Yin Wendu of lower floor low viscosity has covered whole pond lower surface greatly, form a sealer coat, can prevent effectively that following sewage from scurrying into oil trap;
Remove oil tank: adopt novel de-oiling agent HF-LC, the HF-LC that adds concentration 50-200mg/L is to removing in the oil tank, but do not form hypostasis in jar, illustrate that degreaser is inoperative to suspended substance, and it is adhesive attraction in the oil removing process that the part of suspended substance is removed.Be the proof this point, sewage after oil removing adds this degreaser and only the crude oil in the sewage is played demulsification, and the suspended substance in the sewage is not played settlement action, but the sewage behind oil removal removal oil slick enters slurry tank like this, oil in water emulsion in the sewage is breakdown of emulsion under the effect of degreaser, and come-up has reached separating effect oily, mud rapidly, for the dehydration of follow-up suspended substance and mud creates favorable conditions, reclaimed crude oil simultaneously;
Air supporting: add the flotation waste water treatment agent before air supporting, from engineering practice, it is fast that this flotation waste water treatment agent is taken off the speed stabilizing degree to suspended substance, and long-pending wadding is closely knit, but owing to come water water temperature height, flco is difficult for precipitation.Utilize the air supporting principle, with the scum silica frost air supporting that produces surface to the pond, do not allow scum silica frost be sunken at the bottom of the pond, developed the up slag scraper of a kind of chain-plate type in conjunction with the characteristics of running type slag scraper and chain-plate type slag scraper again, between terminal point slag receiving trough and chain scraper, closely cooperate, rely on the method for machinery, utilize the up left-falling stroke of scraper plate to carry the collection scum silica frost.Air supporting is to adopt air-dissolving air-float, with the heterogeneous air dissolved pump technology of gas-liquid, molten gas equipment such as traditional pneumatically supported dissolving, air compressor machine, reliever, buffer tank have been replaced, solved the shortcoming of condensed oil sewage air supporting difficulty, the upgoing link plate slag scraper combination process that cooperates independent development has successfully solved the removal problem of high-heat heavy crude sewage by suspended thing;
Filter: filtering main purpose is the suspended substance of removing in the sewage, and the re-injection key of low permeability oil field is the concentration and the particle diameter of suspended substance, requires the suspended substance particle diameter less than 2 microns, and thermal recovery boiler influent quality index request concentration of suspension is less than 2mg/L.Therefore we have successfully solved the control requirement of reusing sewage to concentration of suspension and particle diameter through combination filter just and Dynamic Membrane ultra-filtration technique.In the selection of coarse filtration filtrate, adopt composite filtering material, coarse filtration adopts the single compound filtrate through modification, has optimized the grating of water distribution layer and filtrate in the filtration process design.Smart filter part adopts diatomite as filtration medium, goes up in filter element (filter cloth) that to form a layer thickness be 1-5 millimeters filtering layer, the suspended substance in the sewage that dams after sewage is by diatomite filtration.In case after the pressure reduction before and after the diatomite filtration reached 0.1-0.3Mpa, by backwash or the dried slag demoulding of air-blowing, the diatomite of holding back suspended substance came off, restart to film, realize dynamic membrane filtering.The diatomite particle diameter is 5-30 microns, and the amount of filming is 0.5-1.0kg/m
2Filtering unit (filter element) is a filter cloth, and the filter cloth material is polypropylene fibre or terylene, and the filter cloth air penetrability is 400-600 orders.Ultrafilter adopts plate frame structure, and one is the water distribution frame, and one is filter frame, and the two forms a filtering unit (filter element), and filter element (filter cloth) is placed in the middle of the two.The water inlet of employing downside, the Inlet and outlet water mode of upper side water outlet.The mode that compresses of ultrafilter is a hydraulic structure;
Silica removal: oilfield process produces oily(waste)water at present, and the content of silicon-dioxide is the water quality requirement (less than 50mg/L) that 60-300mg/L does not reach regulation in the condensed oil sewage, therefore must silica removal.The silica removal device is formed by mixing, react, precipitate three parts.PH regulates the mixing of part and adopts pipeline static mixer, the speed governing stirrer is adopted in the mixing of silica removal and flocculation operation, silica removal operation rotating speed is controlled at 500-1000 rev/mins, and flocculation operation rotating speed is controlled at 100-500 rev/mins, just can reach the dual purpose of hybrid reaction.In the precipitation part, the horizontal flow velocity of precipitation is 1-5 mm/second, sets up swash plate or inclined tube in the water part.Dissolved silicon in the sewage adopts chemical process to remove, and has overcome the influence of sewage middle and high concentration organic pollutant to silicon removing process, has realized the chemical silica removal technology of oilfield sewage.Adopt magnesia mixture or magnesium salts silicon removing process, under alkaline condition, the dissolved silicon in the sewage is removed in the settling tank of silica removal device by forming the Magnesium Silicate q-agent throw out with magnesia mixture or magnesium salts reaction.The silica removal device is by mixing, react and precipitate three part organic composition one.Silica removal medicament PH conditioning agent (alkaline matter), desiliconizing agent (magnesia mixture or magnesium salts), flocculation agent (polypropylene amine), the mixing of medicament and reaction adopt the combination of waterpower and machinery to realize;
Softening: oilfield sewage can replace the supplementary feed of clear water as thermal recovery boiler by advanced treatment, mainly is by this technology the hardness in the sewage to be reduced in realizing the oilfield sewage softening process, prevents to generate incrustation scale at the boiler internal surface.Oilfield sewage is softening to have great difficulty, mainly is that oilfield sewage contains organic substrate concentration height.Therefore the remollescent key is to select for use the ion exchange resin of anti-pollution, easily recovery, the high saliferous oilfield sewage of adaptation, to adapt to oilfield sewage softening process and device thereof.The softening fixed bed that adopts does not have roof pressure counter-current regeneration ion exchange technique, selects the macropore weak acid ion-exchange resin for use, the mode that acid-alkali regeneration liquid adopts water sprayer to add.Sewage enters from the interchanger top during normal the exchange, and softening water is discharged from the bottom.Must regenerate when saturated when exchange reaches, drainage pattern in the no roof pressure adverse current is adopted in resin regeneration.This apparatus features is to adopt Macroporous Weakly-Acid, anti-organic contamination ability is strong, acid regeneration and alkali by Macroporous Weakly-Acid make the transition, make resin in acid, alkaline purification process, pass through to expand and shrink, the organism of resin absorption is removed in backwash process, adopt water sprayer to add bronsted lowry acids and bases bronsted lowry, operational safety, easy.The no roof pressure counter-current regeneration type ion exchange unit of draining in the employing, effluent quality is good, the not random layer of resin, regenerated liquid consumes low, resin regeneration degree height;
The heavy crude oily sludge dehydration: the oil-field thick-oil sludge moisture content is generally all more than 95%, and contain a large amount of viscous crude, oleaginousness is more than 20%, mud is mobile poor, mud, water are entrained in together mutually, the three phase separation difficulty, and also suspended substance proportion and water in the heavy crude oily sludge are approaching, fine size can not be with itself and water sepn by gravity and centrifugal force.At above-mentioned situation, the contriver has been developed into " heavy crude oily sludge dewatering unit " and has solved a heavy crude oily sludge mechanical dehydration difficult problem, by reducing the oleaginousness in the heavy crude oily sludge, changed the condition of heavy crude oily sludge dehydration,, proportion thin at solid grain size in the heavy crude oily sludge and the approaching characteristics of water, this device adopts automatic van-type filter press technology.Slag dumping adopts automatic arm-tie, and the output section adopts horizontal belt to carry or twist the mode of cage.Flow into for the press filtration water that prevents the press filtration initial stage in the discharging machine of pressure filter bottom, set up water eliminator in the middle of pressure filter and discharging machine, when press filtration begins, the water eliminator pull-up is leaked water and is flowed out by the certain gradient of water eliminator; When discharging, water eliminator draws back, and mud cake falls into discharging machine, has avoided filtered water inflow discharging machine in the pressure-filtering process.This apparatus features is, researched and developed novel de-oiling agent HF-LC, it only plays breakdown of emulsion, cohesion to the oil in water emulsion in the sewage, and inoperative to suspended substance, reach oil, the isolating purpose of mud, for condition has been created in the processing of suspended substance, adopt the water technology of " first oil removing; back slagging-off ", reduce the oleaginousness the heavy crude oily sludge from the source, for dirty oil dewatering has been created condition.Automatic van-type plate-and-frame filter press is adopted in sludge dewatering, need not add any dewatering agent, can make sludge moisture content reduce in 70% the not sticking stackable outward transport of mud from 95%.For preventing that press filtration water pollutes mud cake in the pressure-filtering process, in the middle of pressure filter and discharging machine, set up water eliminator.The van-type plate-and-frame filter press adopts automatic pulling plate structure, and the arm-tie time can arbitrarily be set, can manually also can be automatic.
The present invention compared with prior art, " condensed oil sewage advanced treatment and reuse technology " is domestic unique engineering practice that successfully is used at present, this technology has overcome the shortcoming of conventional condensed oil sewage treatment process, when realizing the disposing polluted water in oil zero release, can from sewage, reclaim a large amount of high value crude oil, condensed oil sewage after advanced treatment can be as the re-injection water of low permeability oil field, also can replace the clear water direct reuse in thermal recovery boiler, saved water resources, high temperature sewage replaces clear water can save a large amount of fuel costs as the supplementary feed of thermal recovery boiler, makes the oil field realize cleaner production and Sustainable development.The more important thing is the crude production water filling and produce water to have reached running balance, realized the closed cycle of water in the oilfield process, created very considerable economic and environmental benefit.
Fig. 1 is condensed oil sewage advanced treatment and reuse technology process schematic representation.1 is oil removal among the figure, equalizing tank, and the 2nd, remove oil tank, the 3rd, air flotation pool, the 4th, silica removal, the 5th, coarse filtration, the 6th, the Dynamic Membrane ultrafiltration, the 7th, softening, the 8th, deoxygenation.
Fig. 2 is condensed oil sewage advanced treatment and reuse technology sludge treatment technique synoptic diagram.9 is oily sludges among the figure, the 10th, and sludge sump, the 11st, spiral pump, the 12nd, water extracter, the 13rd, mud transfer roller.
Several embodiment are described in conjunction with the accompanying drawings:
Embodiment 1:
The present invention such as Fig. 1 are from oil removing, remove suspended substance, silica removal, softening, the accompanying drawing combination is pressed in five aspects of sludge dewatering could realize condensed oil sewage advanced treatment and reuse technology, solve the problems of the prior art: oil removing is to adopt to be provided with the constant device of water level in oil trap, developed a kind of viscous crude collection device simultaneously, changed be adjusted in before, oil removal after water technology, in the viscous crude collection device, increased heat-conducting oil heating system, it only heats top layer oil, form viscous crude upper strata heating viscosity reduction and flow to oil trap, sealing ply of the big formation of lower floor's viscous crude Yin Wendu low viscosity can prevent that following sewage from scurrying into oil trap; In removing oil tank, adopt the degreaser HF-LC of development newly, adding concentration is 50-200mg/L, in removing oil tank, do not form throw out, use the novel de-oiling agent and only the crude oil in the sewage is played demulsification, and the suspended substance in the sewage is not played settlement action, but the sewage behind oil removal removal oil slick enters in the slurry tank like this, oil in water emulsion in the sewage is breakdown of emulsion under the effect of degreaser, float rapidly, reach the separation of oil, mud, for follow-up suspended substance and sludge dewatering create conditions, reclaimed crude oil simultaneously.
Embodiment 2:
Feature of the present invention also is to remove suspended substance, mainly utilizes the air supporting principle, develops a kind of flotation waste water treatment agent, and it is fast that it takes off the speed stabilizing degree to outstanding newborn thing, and long-pending wadding is closely knit, and flco is difficult for precipitation, with the floating surface to the pond of the scum silica frost that produces, does not allow scum silica frost be sunken at the bottom of the pond.The contriver has developed the up slag scraper of a kind of chain-plate type in conjunction with the characteristics of running type slag scraper and chain-plate type slag scraper, closely cooperates between terminal point slag receiving trough and chain scraper, relies on mechanical means, utilizes the up left-falling stroke of scraper plate to carry the collection scum silica frost; Adopt the heterogeneous air dissolved pump technology generation of gas-liquid to replace molten gas equipment such as the dissolving of traditional air-dissolving air-float, air compressor machine, reliever, buffer tank, solve the shortcoming of condensed oil sewage air supporting difficulty, solved the removal problem of high-heat heavy crude sewage by suspended thing with the upgoing link plate slag scraper combination process of independent development; The re-injection water water quality requirement of low permeability oil field is that suspended substance is less than 2mg/L, particle diameter is less than 2 microns, the thermal recovery boiler influent quality requires suspended substance less than 2mg/L, filter and Dynamic Membrane ultra-filtration technique had solved the requirement to concentration of suspension and particle diameter at the beginning of the contriver utilized and makes up, the coarse filtration filtrate adopts composite filtering material, has optimized the grating of water distribution layer and filtrate in filtration process; Smart filter adopts diatomite to make filtration medium, goes up the filtering layer that forms 1-5 mm thick in filter element (filter cloth), after the pressure reduction before and after the diatomite filtration reaches 0.1-0.3MPa, by backwash or dried slag demoulding, the diatomite of holding back suspended substance comes off, and restarts to film, and realizes dynamic membrane filtering.Select for use the diatomite particle diameter to be 5-30 microns, the amount of filming is every square metre of filtration area 0.5-1.0kg, and filtering unit is a filter cloth, the filter cloth material is polypropylene fibre or terylene, the filter cloth air penetrability is 400-600 orders, and ultrafilter adopts plate frame structure, and one is the water distribution frame, one is filter frame, the two forms a filtering unit, in the middle of filter cloth is placed on, adopts the downside water inlet, it is hydraulic structure that the Inlet and outlet water mode of upper side water outlet, ultrafilter compress mode.
Embodiment 3:
Feature of the present invention also is silica removal: dioxide-containing silica is 60 1 300mg/L in the oil-contaminated water of oil field, and the thermal recovery boiler water requires silicon content less than 50mg/L, for this reason, the contriver has developed a kind of silica removal device, it is by mixing, reaction, precipitating three parts forms, the three is organic to become one, PH regulates the mixing of part and adopts pipeline static mixer, the speed governing stirrer is adopted in the mixing of silica removal operation and flocculation operation, silica removal operation rotating speed is controlled at 500-1000 rev/mins, flocculation operation rotating speed is controlled at 100-500 rev/mins, just can reach mixing, the dual purpose of reaction.In the precipitation part, the horizontal flow velocity of precipitation is 1-5 mm/second, set up swash plate or inclined tube in the water part, dissolved silicon in the sewage adopts chemical process to remove, adopt magnesia mixture or magnesium salts under alkaline condition, to control pH value between 9.5-11, dissolved silicon in the sewage is by removing in settling tank with magnesia mixture or magnesium salts reaction formation Magnesium Silicate q-agent throw out, the silica removal medicament has PH conditioning agent (alkaline matter), desiliconizing agent (magnesia mixture or magnesium salts), flocculation agent (polyacrylamide), the mixing of medicament and reaction adopt waterpower and machinery to organically combine and realize.
Embodiment 4:
Feature of the present invention also is to soften: oilfield sewage can be used as the supplementary feed of thermal recovery boiler after by advanced treatment, and its key is the hardness in the sewage to be reduced reach water supply standard (0.1ppm), and therefore, sewage is softening very important, and the difficulty of solution is very big.The contriver selects anti-pollution, easily recovery for use, adapts to the exchange resin of high saliferous oilfield sewage, and oilfield sewage is softening to be handled to adapt to.The softening fixed bed that adopts does not have roof pressure counter-current regeneration ion exchange technique, uses the macropore weak acid ion-exchange resin, and acid-alkali regeneration liquid adopts the water sprayer dosing method.During normal the exchange, sewage enters from the interchanger top, softening water is discharged from the bottom, when exchange is saturated, must regenerate, no roof pressure reflux type is adopted in resin regeneration, this device adopts Macroporous Weakly-Acid, anti-organic contamination ability is strong, makes the transition by sour fat regeneration and alkali, makes resin pass through to expand and shrink in acid, alkaline purification process, the organism of resin absorption is removed in backwash process, the no roof pressure counter-current regeneration type ion exchange unit of draining in the employing, effluent quality is good, the not random layer of resin, regenerated liquid consumes low, resin regeneration degree height.
Embodiment 5:
Feature of the present invention also is the heavy crude oily sludge dehydration: heavy crude oily sludge water content height, and generally more than 95%, oleaginousness is more than 20%, and mud is mobile poor, and mud, oil, water are entrained in together mutually, three's separation difficulty; Suspended substance proportion in the heavy crude oily sludge and water is approaching, fine size can not be with itself and water sepn by gravity and centrifugal force; At the problems referred to above, the contriver has developed the heavy crude oily sludge dewatering unit, and it has solved the problems referred to above effectively, by reducing the oleaginousness in the heavy crude oily sludge, has changed the condition of heavy crude oily sludge dehydration., proportion thin and the approaching characteristics of water at solid grain size in the heavy crude oily sludge, this dewatering unit adopts automatic van-type filter press technology, slag dumping adopts automatic arm-tie, discharging adopts horizontal belt to carry or twist the mode of cage, in the middle of pressure filter and discharging machine, be provided with water eliminator, when press filtration begins, the water eliminator pull-up is leaked water and is flowed out by the water eliminator certain slope; Water eliminator draws back when discharging, mud cake falls into discharging machine, avoided in the pressure-filtering process press filtration water to flow in the discharging, the contriver is the novel de-oiling agent HF-LC of independent development also, it only plays breakdown of emulsion to the oil in water emulsion in the sewage, cohesion, inoperative to suspended substance, realized the isolating purpose of greasy filth, adopt the water technology of " first oil removing; back slagging-off ", for condition has been created in sludge dewatering, automatic van-type plate-and-frame filter press is adopted in sludge dewatering, need not add any dewatering agent moisture percentage in sewage sludge is reduced in 70% from 95%, and mud is sticking, stackable, outward transport, the van-type plate-and-frame filter press adopts automatic pulling plate structure, and the arm-tie time can arbitrarily be set, can manually also can be automatic.
Claims (1)
1, the condensed oil sewage advanced treatment and the reuse technology of a kind of disposing polluted water in oil and reuse is characterized in that:
A, from oil removing, remove suspended substance, silica removal, softening, five aspects of sludge dewatering could realize condensed oil sewage advanced treatment and reuse technology by the accompanying drawing combination: oil removing is to adopt to be provided with the constant device of water level in oil trap, developed a kind of viscous crude collection device simultaneously, changed the water technology of " before being adjusted in; oil removal is in the back ", in the viscous crude collection device, increased heat-conducting oil heating system, it only heats the top layer viscous crude, form viscous crude upper strata heating viscosity reduction and flow to oil trap, sealing ply of the big formation of lower floor's viscous crude Yin Wendu low viscosity can prevent that following sewage from scurrying into oil trap; Adopt the novel finish HF-LC that falls in removing oil tank, adding concentration is 50-200mg/L, does not form throw out in removing oil tank.Use the novel de-oiling agent and only the crude oil in the sewage is played demulsification, and the outstanding newborn thing in the sewage is not played settlement action, but the sewage behind oil removal removal oil slick enters slurry tank like this, and the oil in water emulsion in the sewage is breakdown of emulsion, rapid come-up under the effect of degreaser, reaches the separation of oil, mud;
B, remove suspended substance and mainly utilize the air supporting principle, develop a kind of flotation waste water treatment agent, it is fast that it takes off the speed stabilizing degree to suspended substance, and long-pending wadding is closely knit, and flco is difficult for precipitation, with the floating surface of the scum silica frost that produces to the pond, do not allow scum silica frost be sunken at the bottom of the pond, the contriver has developed the up slag scraper of a kind of chain-plate type in conjunction with the characteristics of running type Oil scraper and chain-plate type slag scraper, closely cooperates between terminal point slag receiving trough and chain scraper; Rely on mechanical means, utilize the up left-falling stroke of scraper plate to carry the collection scum silica frost; The heterogeneous air dissolved pump technology of employing gas-liquid has solved the shortcoming of condensed oil sewage air supporting difficulty, has solved the taking-up problem of high-heat heavy crude sewage by suspended thing with the upgoing link plate slag scraper combination process of independent development; The re-injection water water quality requirement of low permeability oil field is that suspended substance is less than 2mg/L, particle diameter is less than 2 microns, the thermal recovery boiler influent quality requires suspended substance less than 2mg/L, filter and Dynamic Membrane ultra-filtration technique had solved the requirement to concentration of suspension and particle diameter at the beginning of the contriver made up: the coarse filtration filtrate adopts composite filtering material, has optimized the grating of water distribution layer and filtrate in filtration process; Smart filter adopts diatomite to make filtration medium, goes up the filtering layer that forms 1-5 mm thick in filter element (filter cloth), after the pressure reduction before and after the diatomite filtration reaches 0.1-0.3MPa, by backwash or the dried slag demoulding of air-blowing, the diatomite of holding back suspended substance comes off, and restarts to film, and realizes dynamic membrane filtering.Select for use the diatomite particle diameter to be 5-30 microns, the amount of filming is every square metre of filtration area 0.5-1.0kg, and filtering unit (filter element) is a filter cloth, and the filter cloth material is polypropylene fibre or terylene, filter cloth air penetrability rate is 400-600 orders, ultrafilter adopts plate frame structure, and one is that one of water distribution frame is filter frame, and the two forms a filtering unit, in the middle of filter cloth is placed on, the water inlet of employing downside, the Inlet and outlet water mode of upper side water outlet, it is hydraulic structure that ultrafilter compresses mode;
C, silica removal: dioxide-containing silica is 60-300mg/L in the oil-contaminated water of oil field, and the thermal recovery boiler water requires silicon content less than 50mg/L, for this reason, the contriver has developed a kind of silica removal device, it is formed by mixing, react, precipitate three parts, the three is organic to become one, PH regulates the mixing of part and adopts pipeline static mixer, the speed governing stirrer is adopted in the mixing of silica removal operation and flocculation operation, silica removal operation rotating speed is controlled at 500-1000 rev/mins, and flocculation operation rotating speed is controlled at 100-500 rev/mins, just can reach the dual purpose of mixing, reaction.In the precipitation part, the horizontal flow velocity of precipitation is 1-5 mm/second, set up swash plate or inclined tube in the water part, dissolved silicon in the sewage adopts chemical process to remove, adopt the reaction of magnesia mixture or magnesium salts to generate the Magnesium Silicate q-agent throw out and remove in settling tank, the silica removal medicament has PH conditioning agent (alkaline matter), desiliconizing agent (magnesia mixture or magnesium salts), flocculation agent (polyacrylamide), the mixing of medicament and reaction adopt waterpower and machinery to organically combine and realize;
D, softening: oilfield sewage can be used as the supplementary feed of thermal recovery boiler after by advanced treatment, its key be with the hardness in the sewage reduce reach water supply standard (＜0.1ppm), the difficulty that solves is very big, the contriver selects anti-pollution for use, easily recovery, the exchange resin that adapts to high saliferous oilfield sewage, to adapt to the softening treatment unit of development oilfield sewage, the softening fixed bed that adopts does not have roof pressure counter-current regeneration ion exchange technique, use the macropore weak acid ion-exchange resin, acid-alkali regeneration liquid adopts the water sprayer dosing method, during normal the exchange, sewage enters from the interchanger top, softening water is discharged from the bottom, when exchange is saturated, must regenerate, no roof pressure reflux type is adopted in resin regeneration, this device adopts Macroporous Weakly-Acid, anti-organic contamination ability is strong, acid regeneration and alkali by weak acid resin make the transition, make resin in acid, by expanding and shrinking, the organism of resin absorption is removed the no roof pressure counter-current regeneration type ion exchange unit of draining in the employing in backwash process in the alkaline purification process, effluent quality is good, the not random layer of resin, regenerated liquid consumes low, resin regeneration degree height;
E, the heavy crude oily sludge dehydration: heavy crude oily sludge water content height, generally more than 95%, oleaginousness is more than 20%, and mud is mobile poor, and mud, profit mix together mutually, three's separation difficulty; Suspended substance proportion and water in the heavy crude oily sludge are approaching, and fine size is can not be with itself and water sepn by gravity and centrifugal force; Developed the heavy crude oily sludge dewatering unit at the problems referred to above contriver, it has effectively solved the problems referred to above, by reducing the oleaginousness in the heavy crude oily sludge, changed the condition of heavy crude oily sludge dehydration, thin at solid grain size in the heavy crude oily sludge, the characteristics that proportion and water are approaching, this dewatering unit adopts automatic van-type filter press technology, slag dumping adopts automatic arm-tie, discharging adopts horizontal belt to carry or twist the mode of cage, is provided with water eliminator in the middle of pressure filter and discharging machine, when press filtration begins, the water eliminator pull-up is leaked water and is flowed out by the water eliminator certain slope; Water eliminator draws back when discharging, mud cake falls into discharging machine, avoided press filtration water inflow discharging machine in the pressure-filtering process, the contriver also utilizes the novel de-oiling agent HF-LC of new independent development, it only plays breakdown of emulsion to the oil in water emulsion in the sewage, cohesion, inoperative to suspended substance, realized the isolating purpose of greasy filth, adopt the water technology of " first oil removing; back slagging-off ", for condition has been created in sludge dewatering, automatic van-type plate-and-frame filter press is adopted in sludge dewatering, need not add any dewatering agent moisture percentage in sewage sludge is dropped in 70% from 95%, mud is sticking not stackable, outward transport, the van-type plate-and-frame filter press adopts automatic pulling plate structure, and the arm-tie time can arbitrarily be set, can manually also can be automatic.
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Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303020C (en) * | 2004-01-08 | 2007-03-07 | 李国文 | Method for treating oilys ludge using three-phase separating technique |
| CN1318314C (en) * | 2005-05-08 | 2007-05-30 | 西安交通大学 | Integrated dynamic balance treating method for oily sewage and apparatus thereof |
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| CN110023250A (en) * | 2016-12-09 | 2019-07-16 | 奥加诺株式会社 | For handling the processing system and processing method of the water containing silica |
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