CN103570181A - Treatment technology of oily sewage of biodiesel factories - Google Patents
Treatment technology of oily sewage of biodiesel factories Download PDFInfo
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- CN103570181A CN103570181A CN201210253410.8A CN201210253410A CN103570181A CN 103570181 A CN103570181 A CN 103570181A CN 201210253410 A CN201210253410 A CN 201210253410A CN 103570181 A CN103570181 A CN 103570181A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a treatment technology of oily sewage of biodiesel factories. The treatment technology comprises following steps: first step, the oily sewage discharged by biodiesel production lines is delivered into an oil separation pond for layered filtration; second step, the filtered oily sewage is delivered into an aeration tank for full aeration and degradation, and is delivered into a temporary storage pond A via overflowing; third step, a flocculating agent is added into the temporary storage pond A, air floatation and foam scraping are performed using an air dissolving pump so as to remove suspended impurities further; fourth step, after air floatation and foam scraping, sewage of a lower layer is delivered into an UASB device for activated sludge degradation; fifth step, the sewage is subjected to anaerobic and aerobic fermentation so as to realize biodegradation of organic impurities; sixth step, after degradation, the sewage is subjected to sand filtration and activated carbon filtration; and seventh step, the filtered sewage is disinfected using chlorine, and then is delivered into a reclaimed water pond. Beneficial effects of the treatment technology are that: full recovery of useful oil in the sewage is realized, and recovered oil is used for production; and zero release of the sewage is realized, and the amount of solid waste is reduced significantly.
Description
Technical field
The present invention relates to a kind of sewage treatment process, especially relate to the technique of a kind of biofuel factory's oily water treatment and middle water reuse, wastewater zero discharge.
Background technology
Biofuel is the lipid acid mono alkyl ester for example, being made through transesterify by animal-plant oil and alcohol (methyl alcohol or ethanol), and most typical is fatty acid methyl ester, with BD100, represents, carries out national standard GB/T20828～2007.Biofuel Blended fuel (B5) is carried out national standard GB/T25199～2010.Biofuel is that a kind of good petrifaction diesel supplements and substitute.
In the evolution of biofuel, once there were the production methods such as direct mixing method, mini-emulsion process, pyrolysis method and ester-interchange method.Directly mixing and micro emulsifying method are that animal-plant oil is mixed in petrifaction diesel, do not change the chemical composition of grease.The product that pyrolysis method forms does not possess lipid acid mono alkyl ester molecular structure yet.Only has ester-interchange method to produce to meet the biofuel product of standard GB/T/T20828～2007.
Production biofuel grease used has different requirements according to technique difference.Developed country is used polished fat's production biofuel more.Domestic for avoid with people strive grain, with grain strive ground, fully use the inedible oil resources such as sewer oil, swill oil, frying waste oil, acidification oil, crude oil inferior, can be referred to as non-polished fat.Use non-polished fat can reduce production costs to a certain extent and be beneficial to the non-food product direction application of waste oil.
In process of production, raw materials pretreatment, storage tank are cut the operations such as catalyst detergent in water, grease, Methanol Recovery, processed oil alkali-refining deacidification all can discharge the waste water of oil-containing and acid sludge, mud to biofuel.Race oil leakage oil under mill floor flushing, accident conditions also can discharge the sewage of floorboard with high oil content.
The sewage of production of biodiesel process discharge contains common animal-plant oil (triglyceride level), crude fatty acid methyl ester (RCOOCH
3), lipid acid (RCOOH), soap (RCOONa), salt (Na
2sO
4), mud, a small amount of methyl alcohol, alkali (NaOH) or acid (H
2sO
4) and a large amount of ortho-water, there is obvious oil slick, staticly settle.Common oily(waste)water emulsification is less, and layering is obvious, and oil trap treatment effect is obvious.Biofuel sewage contains a large amount of soaps, and sewage, often in serious emulsification state, is very easily enclosed greasy layer on the walls such as pipeline irrigation canals and ditches.In the situation of stock oil inferior quality, the organic detritus containing in sewage, mud can showed increased.Sewage outward appearance color depth, dun, to brown, opaque, muddy, have peculiar smell.With produce changing, drain time different and whether rain, rinse water purification and add, cash as sewage quality and quantity is in time all at irregular fluctuation.
The quality of biofuel plant effuent and generation and variation fluctuation thereof determine that it needs a kind of sewage disposal technology, with the target of water reuse, zero release in realizing, and low operating cost, reach the requirement of environment protection and saving water resource.
Summary of the invention
For overcoming the deficiency in prior art, the object of the invention is to provide a kind of biofuel factory oil-containing sewage treatment technique, for biofuel plant effluent, purifies and can completely middle water reuse.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
Processing step of the present invention is as follows:
The first step, imports oil trap by the sewage of biodiesel oil production line discharge, carries out layered filtration, reclaims the oil slick on upper strata;
Second step, by the sewage importing aeration tank after filtering, fully aeration degraded, and overflow is to storing up temporarily pond A;
The 3rd step adds flocculation agent in temporary storage pond A, and under air dissolved pump effect, foam is scraped in air supporting, further removes suspended impurity;
The 4th step, lower floor's sewage that air supporting is scraped after foam enters UASB equipment, carries out active sludge degraded;
The 5th step, further carries out anaerobic and aerobic fermenting organism degraded organic impurity to sewage;
The 6th step, after degraded, sewage, through sand filtration, activated carbon filtration, is removed active sludge;
The 7th step, the sewage after filtration enters middle pond after chlorine disinfectant, becomes qualified middle water.
In the above-mentioned the first step, described oil trap has three, is cascaded respectively, in first oil trap, adds appropriate emulsion splitter.Further, described emulsion splitter is the vitriol oil, uses pH detection paper, and pH value of sewage water in this pond is remained between 6-7 always.
In above-mentioned second step, after aeration degraded, use pH detection paper, pH value must remain between 6-8, and pH value is excessive with appropriate amount of acid tune, too lowly with alkali, adjusts.
In above-mentioned the 3rd step, add after flocculation agent, stir, until being fully dissolved into solution, flocculation agent just can stop stirring.
The slag that wastewater treatment process produces is through depth filtration, deep bed filtration, and slag enters the airing of mud field.Active sludge is also in the airing of mud field.Final these slags and active sludge and coal blending, send boiler combustion, for production system provides energy, and significantly reduces solid waste amount.Final solid waste only has slag a kind of, and slag is outer selling for paving the way or making burn-free bricks etc.
The effect that the present invention is useful is:
1, fully reclaim oil useful in sewage, be back to production;
2, realize sewage zero-discharge, and significantly reduce solid waste amount, improve and produce plant environment, meet environmental protection requirement;
3, middle quality is good reliable, can reuse production, boiler house purifies chimney gas, cooled slag, plant area's greening, rinses ground etc.Realize water resources and make full use of, significantly reduce water loss;
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the present embodiment.
Embodiment
The present invention will be further described in conjunction with the embodiments.
Referring to Fig. 1, processing step of the present invention is as follows:
The first step, the sewage of biodiesel oil production line discharge imports production line oil partiting precipitation pool, reclaims most of sump oil and holds back most of sedimentation mud, alleviates sewage works load.The oil trap of sewage works has three, is cascaded respectively, and the sewage after tentatively filtering is imported to oil trap, utilizes physical method to carry out layered filtration, and the oil slick of isolating upper strata is recycled to biodiesel raw material oil and unloads oil sump, re-uses.
Biofuel is different from common petrifaction diesel, and institute's sewage effluent character is also variant.The sewage of production of biodiesel process discharge contains common grease (triglyceride level), thick methyl esters, lipid acid (RCOOH), soap (RCOONa), salt (Na
2sO
4), a small amount of alkali (NaOH) or acid (H
2sO
4) and a large amount of ortho-water.Common oily(waste)water emulsification is less, and layering is obvious, and oil trap treatment effect is obvious.Biofuel sewage contains a large amount of soaps, and sewage, often in serious emulsification state, need to add appropriate emulsion splitter, abolishes emulsification and realizes layering, makes oil trap reach expection separating effect.In the present embodiment, emulsion splitter, for meeting the vitriol oil of standard GB/T/T534-2002 industrial sulphuric acid salable product, also can be used and produce no waste acid water replacement.With production, carry out in the first oil trap, adding the appropriate vitriol oil in good time, use pH detection paper, pool inner water layer pH value is remained between 6-7 always.After adding the vitriol oil, stir immediately, make abundant reaction, each churning time be no less than 15min (minute).After stirring, after standing half an hour, the oil slick on upper strata is salvaged and reclaimed.
It is to be noted:
1 while adding the vitriol oil, can only make water keep subacidity, can not peracid.During acid adding on a small quantity repeatedly, careful adding.
2 lower floor's sewage should be comparatively limpid, without obviously emulsification.If water pH value has been closed regulation, but emulsifying water is still serious, after fully stirring, need suitably to increase time of repose.
3 find oil extractions too much or other extremely must report production plant responsible official, be strictly on guard against leakage of oil or other accidents.
4 need to record water pH value herein and reclaim oil mass, the time of acid adding and amount.
Chemical reaction herein:
Principal reaction: 2RCOONa+H
2sO
4the 2RCOOH+Na of===
2sO
4
If being alkalescence, sewage has less important reaction: 2NaOH+H
2sO
4the Na of===
2sO
4+ H
2o
Slight acidifying and the neutralization reaction of main generation, makes soap become lipid acid with grease and water stratification herein.Oil float is isolated by oil trap on upper strata, and sewage flows to lower storage reservoir by filler in lower floor, after three grades of oil removals, enters aeration tank.
Second step, sewage after filtering is imported to aeration tank, aerating apparatus is arranged at bottom, aeration tank, can inject large quantity of air, increase oxygen content in water, realize preliminary chemical oxidation, take a part of gas soluble substance out of sewage simultaneously, also liquid fully can be stirred, dirt is suspended evenly, facilitate next step flocculation treatment.
During operation, start rotary fan, open aeration head valve, aeration 10-15min (minute), within 2 hours, open once.Use pH detection paper, pH value must remain between 6-8, and pH value is excessive to be adjusted by appropriate amount of acid, too lowly with alkali, adjusts.
It is to be noted:
On 1 liquid level, must not there is oil slick.There is oil slick explanation previous step to process not thorough, need to strengthen previous action.By recovery of oil.
Whether 2 need to record the water surface herein oil slick, water pH value and soda acid add-on, sample time and mensuration personnel.
Chemical reaction herein:
2NaOH+H
2SO
4＝＝＝Na
2SO
4+H
2O
Partial air oxidation
After the abundant aeration degraded of sewage, overflow is to storing up temporarily pond A.
The 3rd step adds flocculation agent in temporary storage pond A, and under air dissolved pump effect, foam is scraped in air supporting, further removes suspended impurity;
Application is flocculating principles and air supporting principle herein.
After adding, flocculation agent can form colloid, by trickle suspended substance coacervating large particle in water, megalump.Suspend and have necessarily and electrically repel each other between thin thing, flocculation agent is electrically harmonious with suspended substance, thereby by being distributed to gathering, finally surpassing buoyancy of water and be able to separated with viscous force.Even be still more or less the same with water proportion because suspended substance is gathered into agglomerate, naturally staticly settle and need to for a long time and be not suitable for continuous processing, therefore apply air supporting simultaneously, process.
Air dissolved pump sucks air and water simultaneously, and pressurized storage makes portion of air soluble in water, makes the water containing saturated air.The other dissolving of Air-float separator will keep 3 kilograms of pressure, and pressure greatly water is large to the solubleness of air, can dissolve in more air.Gas-water ratio is controlled and is controlled by air intake valve opening angle.Opening angle is too small, and gas enters less, although pressure is enough large, molten gas is still not enough.Otherwise opening angle is excessive, gas enters too much, and liquid enters few, does not have enough liquid to carry out gas dissolved on the one hand, and the easy air sinuses of pump, cannot produce enough pressure on the other hand.So molten gas process need finds suitable vapour-liquid ratio and pressure.
After molten device tank internal water pressure is up to standard, uniform liquid is put into Air-float separator, and pressure becomes normal pressure from 3 kilograms, and liquid declines suddenly to the solubleness of air, becomes supersaturated solution.Large quantity of air is separated out rapidly from liquid, forms small bubbles and is attached on the agglomerate that suspended substance is gathered into.Suspended substance agglomerate overall buoyancy under bubble is assisted increases severely, and floats to rapidly fluid surface, converges into slag blanket.
Liquid level keeps suitable liquid level in Air-float separator, and scraper plate scrapes off surperficial slag blanket driven by motor is next, flows into slag bath.Scum silica frost is deposited a certain amount of rear filtration, and filter residue send sun sludge field, and filtrate is returned sewage disposal leading portion.
During operation:
No. 1 case of 1 chemical drug cabinet dosing tank is thrown in flocculation agent (polymerize aluminum chloride) 1.5-2 kilogram at every turn, specifically according to sewage situation, suitably throws in, and the too much charging capacity of wastewater suspended substance can suitably increase.
No. 2 casees of 2 chemical drug cabinet dosing tanks are thrown in calcium chloride 3-5 kilogram at every turn, according to sewage situation, suitably throw in, and hyper acid that charging capacity can suitably increase for residual sulfur.
3 open stirrer, make medicine full and uniform.Only have to be fully dissolved into solution and just can to stop stirring, prevent blocking pipe.See that the effect adjustment medicine outlet under meter of purifying waste water is to optimum regime.
4 aeration tanks enter equalizing tank water level and reach 1 meter of ability startup lifting water pump, prevent pump idle running.
5 forbid anhydrous idle running while opening air dissolved pump.
The under meter of the lift pump of 6 use equalizing tanks is set the discharge of sewage into Air-float separator, sewage through air dissolved pump is accounted for and enter 30% of Air-float separator sewage total amount, guarantees that air supporting and flocculation reach optimum regime simultaneously.With the gate height of Air-float separator water outlet, control elevation of water surface in Air-float separator, make water level concordant with collection slag foam notch.Too much and stable can often opening scraping scum machine, scum silica frost amount at least scum silica frost runs up to suitable degree and regularly opens scum silica frost.
Chemical reaction herein:
AlCl
3+ H
2o===Al (OH)
3(colloid)+3HCl
CaCl
2+H
2SO
4＝＝＝CaSO
4↓+2HCl
CaCl
2+Na
2SO
4＝＝＝CaSO
4↓+H
2O
The 4th step, lower floor's sewage that air supporting is scraped after foam enters UASB equipment (Up-flow Anaerobic Sludge Bed/Blanket), carries out active sludge degraded;
The 5th step, the sewage after active sludge degraded enters in close-coupled processing unit (storing up temporarily pond B), and inside, close-coupled processing unit is divided into anaerobically fermenting part and aerobic fermentation part.
Sewage after anterior flocculation treatment still contains higher organism, and under anoxic condition, anerobe transforms organic nitrogen in sewage to resolve into NH
3-N utilizes organic carbon as electron donor, by NO simultaneously
2 -, NO
3 -be converted into N
2, carry out denitrification.Utilize the new cell of part organic carbon and ammonia synthesis simultaneously, maintain flora propagation.
After anaerobically fermenting, aerobic part organic degradation burden alleviates, and under oxygen exists, aerobic bacteria becomes carbonic acid gas and water by organic substance decomposing, and nitrobacteria becomes too much ammonia into nitrous acid and nitrate.In Aerobic Pond, water section is back to anaerobic pond, and for denitrifying bacterium provides electron acceptor(EA), final nitrogen element is separated out with nitrogen form, eliminates organonitrogen and the harm of ammonium salt to body eutrophication.
No matter anaerobically fermenting or aerobic fermentation, bacterium utilizes the materials such as organism and water, oxygen, inorganic mineral to produce the required matter and energy of self growth and breeding in degradation of organic substances process, and emits certain heat.The temperature difference of Chi Shui and external environment can be indicated the vigorous degree of thalline vital movement.
Bacterium has huge specific surface area, and the suitable processing power of condition is very strong.The very large variation of the huge existence of flora radix simultaneously and evolvability.Keep water conditioning, biological treatment part can keep best flora, and flora also can show best processing power.
There is an optimum temperuture in bacterium vital movement, too high too low all unfavorable to biological degradation.Chi Shui is maintained between 20-25 ℃, temperature slightly fluctuates harmless to biochemical treatment within the scope of this as far as possible.
Biological degradation needs the general 6-8 hour of certain hour.Time, too short organic matter degradation was complete not.
Also should not pour in excessive sewage in a short time, sewage is excessive should extend the residence time, and sewage overrich reduces add-on.The system that maintains is within flora processing power.
During operation, reduce inlet amount as far as possible and increase interval time, and charging is wanted slowly evenly.Biological processing unit designed capacity charging BOD
5< 200mg/L, water outlet BOD
5< 20mg/L.With Inlet and outlet water result of laboratory test, adjust inlet amount and treatment time.
Biochemical reaction herein:
Sewage after aerobic fermentation is processed enters in temporary storage pond C.
The 6th step, after degraded, sewage, through sand filtration, activated carbon filtration, is removed active sludge;
With lift pump, sewage is passed through to two set filters, filtration is the conventional processing unit in scavenging process.This two set filter is husky filter and activated carbon filtration series connection.First sand filters larger particles, then activated carbon decolorizing deodorizing.Water after filtration enters in temporary storage pond D.
The 7th step, the sewage after filtration enters middle pond by chlorine device processed after chlorine disinfectant, becomes qualified middle water.
Chemical reaction herein:
Cl
2+H
2O＝＝＝HClO+HCl
HClO+NaOH＝＝＝NaClO+H
2O
HCl+NaOH＝＝＝NaCl+H
2O
The strong sterilization of ClO-
The slag that wastewater treatment process produces is through depth filtration, deep bed filtration, and slag enters the airing of mud field.Active sludge is also in the airing of mud field.Final these slags and active sludge and coal blending, send boiler combustion, for production system provides energy, and significantly reduces solid waste amount.Final solid waste only has slag a kind of, and slag is outer selling for paving the way or making burn-free bricks etc.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification sheets of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (5)
1.Yi Zhong biofuel factory oil-containing sewage treatment technique, is characterized in that: comprise the following steps:
The first step, imports oil trap by the sewage of biodiesel oil production line discharge, carries out layered filtration, reclaims the oil slick on upper strata;
Second step, by the sewage importing aeration tank after filtering, fully aeration degraded, and overflow is to storing up temporarily pond A;
The 3rd step adds flocculation agent in temporary storage pond A, and under air dissolved pump effect, foam is scraped in air supporting, further removes suspended impurity;
The 4th step, lower floor's sewage that air supporting is scraped after foam enters UASB equipment, carries out active sludge degraded;
The 5th step, further carries out anaerobic and aerobic fermenting organism degraded organic impurity to sewage;
The 6th step, after degraded, sewage, through sand filtration, activated carbon filtration, is removed active sludge;
The 7th step, the sewage after filtration enters middle pond after chlorine disinfectant, becomes qualified middle water.
2. biofuel according to claim 1 factory oil-containing sewage treatment technique, is characterized in that: in the above-mentioned the first step, described oil trap has three, is cascaded respectively, in first oil trap, adds appropriate emulsion splitter.
3. biofuel according to claim 2 factory oil-containing sewage treatment technique, is characterized in that: described emulsion splitter is the vitriol oil, uses pH detection paper, and pH value of sewage water in this pond is remained between 6-7 always.
4. biofuel according to claim 1 factory oil-containing sewage treatment technique, is characterized in that: in above-mentioned second step, after aeration degraded, use pH detection paper, pH value must remain between 6-8, and pH value is excessive with appropriate amount of acid tune, too lowly with alkali, adjusts.
5. biofuel according to claim 1 factory oil-containing sewage treatment technique, is characterized in that: in above-mentioned the 3rd step, add after flocculation agent, stir, until flocculation agent is fully dissolved into solution, just can stop stirring.
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|---|---|---|---|
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| CN104529060A (en) * | 2014-12-10 | 2015-04-22 | 朱玉兵 | High-efficiency treatment system for petrochemical wastewater |
| CN105947954A (en) * | 2016-07-07 | 2016-09-21 | 天津蓝新石油化工有限公司 | Automobile lubricating oil processing system |
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| CN104310715A (en) * | 2014-11-04 | 2015-01-28 | 唐山金利海生物柴油股份有限公司 | Treatment method for biodiesel waste water |
| CN104529060A (en) * | 2014-12-10 | 2015-04-22 | 朱玉兵 | High-efficiency treatment system for petrochemical wastewater |
| CN105621812A (en) * | 2014-12-10 | 2016-06-01 | 朱玉兵 | System for treating lead-bearing petrochemical wastewater |
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| CN105984999A (en) * | 2015-03-04 | 2016-10-05 | 济南齐源环保工程有限公司 | Treatment technology for biodiesel wastewater |
| CN105947954A (en) * | 2016-07-07 | 2016-09-21 | 天津蓝新石油化工有限公司 | Automobile lubricating oil processing system |
| CN106145531A (en) * | 2016-08-04 | 2016-11-23 | 河南懿丰油脂有限公司 | A kind of method and system of quick process edible fat production sewage |
| CN106219906A (en) * | 2016-09-18 | 2016-12-14 | 防城港市中能生物能源投资有限公司 | The processing method of biodiesel sour water |
| CN108002614A (en) * | 2018-01-10 | 2018-05-08 | 东莞市盛源石油化工有限公司 | A kind of oil-containing sewage treatment technique |
| CN109052832A (en) * | 2018-08-10 | 2018-12-21 | 上海大学 | The processing method of the waste water generated during Preparation of biodiesel from waste oils |
| CN115043553A (en) * | 2022-07-11 | 2022-09-13 | 茂名市泓宇能源科技有限公司 | Process method and device for treating biodiesel high-concentration production wastewater |
| CN115324006A (en) * | 2022-07-18 | 2022-11-11 | 滨州学院 | Marine oil stain recovery device |
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Application publication date: 20140212 |