CN103112993B - Method for processing oilfield wastewater and fixing CO2 (carbon dioxide) by using microalgae - Google Patents
Method for processing oilfield wastewater and fixing CO2 (carbon dioxide) by using microalgae Download PDFInfo
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Abstract
The invention provides a method for processing oilfield wastewater and fixing CO2 (carbon dioxide) by using microalgae; the method comprises the following steps of: using oilfield wastewater in which the crude oil content is lower than 10mg/L, the TOC (total organic carbon) is lower than 40mg/L and the COD (chemical oxygen demand) is lower than 100mg/L for microalgae cultivation and carbon fixing, introducing CO2 directly into the wastewater, selecting the microalgae with high stress resistance, high oil content and high function in degrading petroleum hydrocarbon according to the water quality of the oilfield wastewater introduced with the CO2, combining the large-scale cultivation of the microalgae with the wastewater treatment, building a large-scale cultivation system by using five stepped microalgae processing ponds which are connected with each other, and then adjusting the water temperature to be 20 DEG C to 35 DEG C; a silicon carbide micro-filtration membrane is used for harvesting, and 10-20% of the harvested microalgae is used as algae seed for the algae liquid cultivation of the next batch and 70-90% of the harvested microalgae is used for preparing biodiesel. The wastewater temperature which is the most proper for the growth of the algae is controlled by controlling the content of fresh wastewater, and the full-year stable and continuous running of the oilfield wastewater processing and CO2 fixing system is achieved.
Description
Technical field
The invention belongs to sewage disposal technology and newborn substance energy field, particularly a kind of micro-algae processing oilfield sewage and fixation of C O of utilizing
2method.
Background technology
Greenhouse effect are maximum environmental problems that 21st century universe faces.Industrial development causes a large amount of CO
2be discharged in atmosphere, only have to absorb to greatest extent to transform CO
2just can coordinate problem between Economic development and environment.Current CO
2fixedly emission-reduction technology can be divided into physical treatment, chemical treatment and biological fixation three classes.In wherein biological fixation method, micro-algae can, under photosynthesis, can utilize CO
2synthetic a large amount of biological substance, as protein, starch, VITAMIN and lipid.And micro-algae has that photosynthetic rate is high, breeding is fast, environmental compatibility is strong, processing efficiency is high and easily and the advantage such as other engineering is integrated, can be applicable to CO
2fixing.
In order to realize micro-algae CO of industrialization
2fixing, lot of domestic and foreign enterprises and research institution have carried out many good tries.As far back as nineteen ninety, Japan internationality trade and the Department of Industry just once subsidized the project of a key name for " technical plan is upgraded in earth research ", and the carbonic acid gas that utilizes micro-algae to absorb in the flue gas of fuel-burning power plant produces the material energy next life.The research institution of total about more than 20 private companys of this plan and government participates in, and invests altogether approximately 2,500,000,000 dollars between 10 years, all fruitful in the work that reduces discharging the aspects such as Strain selection, photosynthetic organism reactor development, micro-algal biomass Energy production; Micro-algae that U.S. green fuel technology company (GreenFuel) and Arizona Public Service Company carried out in the Spain west and south in December, 2007 reduces discharging project, utilizes the CO in the industrial gaseous waste of cement mill
2carry out food, feed and the fuel of micro-algae cultivation exploitation high added value, at present built vertical 100m
2the cultivation greenhouse carry out micro-algae cultivation with the vertical thin-film bioreactor, and plan expands 1000m to
2scale; American UOP company obtains the subsidy of 1,500,000 dollars of USDOE in March, 2010, carry out by micro algae growth and trap CO
2and, for the production of the system verification of biofuel and the energy, the flue gas that this system will be arranged in the manufacturing installation discharge of Virginia Hopewell from Honeywell Inc. traps CO
2, then from micro-algae of cultivating, extracting biofuel, micro-algae residue changes into pyrolysis oil and regenerates for electric power; Industrial gasses giant Germany Linde and U.S. Algenol Biofuels LLC company, also in a kind of technology of catching, store, transporting and supplying with carbonic acid gas of cooperative development in 2010, are applied to Algenol and produce the third generation (3G) biofuel.This patented technology that the said firm has is to utilize in carbonic acid gas, seawater and algae bio to extract biofuel.AlgaeLink NV company is one of bellwether of European alternative fuel industry, in the end of the year 2007, announce to develop in the world first without the prefabricated pipe manufacture but protect with special UV the patent marine alga photo-bioreactor system (photobioreactor systems for algae) that transparent sheet is made.In this photoreaction system round tube that one of auto-folder income is sturdy and durable at an easy rate, diameter is 64cm, this pipe can be automatically tight by water seal.Apply this technology, the cost of transportation will reduce 90%.AlgaeLink NV company, in 3 years of exploitation technique, has also all obtained great progress at aspects such as the research of algae science, micro-algae production system design operations.
Utilize micro-algae to carry out CO
2although fixing reduction of discharging of gas reaches its maturity in theory, also has numerous enterprises and mechanism also all to carry out good try, really realize that the mass-producing application still has many difficulties, reason mainly to be the immature of the too high and large-scale farming technology of cost.So micro-algae CO
2the gas fixedly development trend of emission-reduction technology is to realize low-cost, high efficiency both culturing microalgae by the screening of good algae kind (anti-flue gas, strong stress resistance) and the exploitation of large-scale reactor technology.Micro-algae CO of while
2the gas fixedly other technologies couplings such as reduction of discharging and biofuel, wastewater treatment, biologically active substance exploitation gets up to be fully utilized, Cost reduction when obtaining other high value added products.
Summary of the invention
The objective of the invention is a kind of micro-algae processing oilfield sewage and fixation of C O of utilizing
2method
,by the solid carbon biofuel processed of micro-algae and disposing polluted water in oil, combine; by screening the high algae strain containing grease, high resistance to cold and diseases, high degraded oil pollutent for solid carbon; by adopting the silicon carbide microfiltration membrane to realize gathering of micro-algae and cultivating the algae kind is provided for mass-producing, provide a kind of processing oilfield sewage and fixation of C O
2method, realize disposing polluted water in oil, CO
2fixing and preparing biological diesel oil is coupled together and is fully utilized.
Technical scheme of the present invention is achieved in the following ways:
A kind of micro-algae processing oilfield sewage and fixation of C O of utilizing
2method, refer to and utilize micro-algae to process oilfield sewage, absorb fixing CO
2with the method for preparing biological diesel oil coupling processing, its method steps is as follows:
A) at first to the detection of oilfield sewage, the crude oil contained for the oilfield sewage of both culturing microalgae is lower than 10 mg/L, and the TOC in sewage is less than 40 mg/L, and COD is less than 100 mg/L.
B) by CO
2gas directly passes in oilfield sewage, CO
2non-CO in gas
2part pollutent generation chemistry or physical reaction in composition and oilfield sewage, part pollutent that micro algae growth is exerted an influence is removed, and enters the follow-up ladder algae that declines after the water conditioning indication and cultivates treatment tank.
C) measure and pass into CO
2the water quality of oilfield sewage after gas, add and be applicable to the high algae strain containing grease, high resistance to cold and diseases, high decomposing petroleum hydrocarbon function of having of disposing polluted water in oil, the algae strain utilizes pollutent and the carbonic acid gas in oilfield sewage to be grown, and realizes that oilfield sewage purifies and the solid carbon of micro-algae simultaneously.
D) large scale culturing of micro-algae combines with sewage disposal, sets up 5 the same ladders of capacity algae treating pond that declines, and 5 micro-algae treating ponds are coupled together and form a mobile system, realizes extensive sewage disposal and algal culture.This treatment system is utilized the oilfield sewage water temperature, according to the difference of adopted algae kind, can regulate fresh sewage quantity and control water temperature at 20 ℃-35 ℃, and the cycle of gathering of micro-algae is 5 days.
E) adopt silicon carbide microfiltration membrane micro-algae of being gathered, micro-algae productive rate is at 30 g-60 g/m
2, 20 % of the algae strain content of gathering cultivate for the algae liquid that carries out next batch as the algae kind, save traditional amplification culture pond, and 80 % are for biofuel processed.
F) by controlling the yield of silicon carbide microfiltration membrane, control the concentration of nutrient solution, regulate the variation of winter and summer temperature by the amount of controlling fresh sewage, realize annual algae strain cultivation and disposing polluted water in oil and CO continuously
2fixing.
The accompanying drawing explanation
Fig. 1-schematic flow sheet of the present invention;
1, the preliminary mixing pit of air water, 2, mix water quality stabilization pond, 3, the micro-algae treating pond of one-level, 4, the micro-algae treating pond of secondary, 5, three grades of micro-algae treating ponds, 6, the micro-algae treating pond of level Four, the micro-algae treating pond of 7 Pyatyi, 8, silicon carbide microfiltration membrane algae recovery system, 9, oilfield sewage advanced treatment system, 10, micro-algae biofuel system processed
Embodiment
For further disclosing technical scheme of the present invention, below in conjunction with Figure of description, by embodiment, elaborate:
Implementation process is as follows:
A kind of micro-algae processing oilfield sewage and fixation of C O of utilizing
2method, at first to the detection of oilfield sewage; Guarantee that the crude oil contained in oilfield sewage is lower than 10 mg/L, the TOC in sewage is less than 40 mg/L, and COD is less than 100 mg/L.Then proceed as follows:
(1) by CO
2gas directly passes in the fresh oilfield sewage of the preliminary mixing pit 1 of air water, CO
2the non-CO of gas
2part pollutent generation chemistry or physical reaction in composition and oilfield sewage, the pollutent that micro algae growth is exerted an influence is removed, and enters after mixing wastewater with air in mixing water matter stabilization pond 2 and carries out water conditioning.
(2) sewage after will be stable in mixing water quality stabilization pond 2 flows into the micro-algae treating pond 3 of one-level automatically, during micro-algae treatment system initial start-up, algae strain by the height of selected applicable disposing polluted water in oil containing grease, high resistance to cold and diseases, high decomposing petroleum hydrocarbon function adds into the micro-algae treating pond of one-level, in this amplification culture, micro-algae reaches certain density, sewage is continued automatically to flow into the micro-algae treating pond 4 of secondary, be amplified to gradually successively three grades of micro-algae treating ponds 5, the micro-algae treating pond 6 of level Four, the micro-algae treating pond 7 of Pyatyi, simultaneously to the CO that pass at different levels
2gas, determine and pass into CO according to the pH value of micro-algae growing way and micro-algae the most suitable growth
2the amount of gas.
(3), by 3,4,5,6,7 grades of micro-algae treating ponds couple together and form a mobile system, realize extensive sewage disposal and algal culture.According to the difference of adopted algae kind, can regulate and control water temperature at 20 ℃-35 ℃, the cycle of gathering of large scale culturing is 5 days.
(4) adopting silicon carbide microfiltration membrane recovery system 8 to carry out micro-algae gathers and the dirty water decontamination handles, the 10%-30% of algae strain of gathering transports to the micro-algae treating pond 3 of one-level, and micro-algae that the algae strain of reuse and sewage are mixed for to next round in the ratio of 1:4-8 is cultivated and fresh sewage disposal.The water outlet of silicon carbide micro-filtrate membrane filtration enters after 9 oilfield sewage advanced treatment systems are processed to be carried out re-injection or realizes the sewage recycling processing.The 80% algae strain of gathering enters micro-algae biofuel system 10 processed for biofuel processed.
(5) control the ratio of concentrated algae liquid and fresh sewage by the multiple of controlling silicon carbide micro-filtration membrane concentration algae kind, concentrated algae liquid as the algae kind is long-pending: fresh sewage volume=1:4-10, control the temperature of sewage by the amount of regulating fresh sewage at 20 ℃-35 ℃, realize disposing polluted water in oil and CO
2the fixing whole year of stable, continuous operation.
Claims (3)
1. one kind is utilized micro-algae to process oilfield sewage and fixation of C O
2method, refer to and utilize micro-algae to process oilfield sewage, absorb fixation of C O
2with the method for preparing biological diesel oil coupling processing, its method steps is as follows:
A, at first oilfield sewage is detected, the crude oil contained for the oilfield sewage of both culturing microalgae is lower than 10 mg/L, and the TOC in sewage is less than 40 mg/L, and COD is less than 100 mg/L; B, CO
2gas directly passes in oilfield sewage, CO
2non-CO in gas
2part pollutent generation chemistry or physical reaction in composition and oilfield sewage, to oilfield sewage and CO
2gas carries out rough purification;
C, add and be applicable to the high algae strain containing grease, high resistance to cold and diseases, high decomposing petroleum hydrocarbon function of having of disposing polluted water in oil, the algae strain utilizes pollutent and the CO in oilfield sewage
2grown, realized that oilfield sewage purifies and CO
2fixing;
The harvest time of d, micro-algae is 5 days, set up 5 the same ladders of capacity algae treating pond that declines, 5 micro-algae treating ponds are coupled together and form one by the mobile system of liquid level difference, realize extensive sewage disposal and algal culture, utilize the oilfield sewage water temperature, according to the difference that adds algae strain kind, regulate fresh sewage quantity and control water temperature at 20 ℃-35 ℃;
E, micro algae growth phase are 5 days, and productive rate is 30 g-60 g/m
2, adopt the silicon carbide microfiltration membrane to be gathered, the algae liquid that 10 %-30 % of the algae strain content of gathering carry out next batch as the algae kind is cultivated, and the algae strain of 70 %-90 % is for biofuel processed;
F, by controlling the yield of silicon carbide microfiltration membrane, control the concentration of nutrient solution, regulate the variation of winter and summer temperature by the amount of controlling fresh sewage, realize annual algae strain cultivation and disposing polluted water in oil and CO continuously
2fixing.
2. according to claim 1ly utilize micro-algae to process oilfield sewage and fixation of C O
2method, it is characterized in that the preliminary mixing pit of air water to the height of the micro-algae treating pond between silicon carbide microfiltration membrane recovery system is made as staged from high to low.
3. according to right 1 is described, utilize micro-algae to process oilfield sewage and fixation of C O
2method, it is characterized in that the micro-algae recovery system of silicon carbide microfiltration membrane relies on the power of silicon carbide microfiltration membrane system to the micro-algae treating pond of one-level and the strain of micro-algae biofuel system conveying processed algae, without increasing power system, and the oilfield sewage purified adopts the pipeline that boosts to carry to recycle system.
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| CN104556546A (en) * | 2013-10-29 | 2015-04-29 | 中国石油化工股份有限公司 | A method for fixing CO2 by cultivating microalgae in oilfield sewage |
| CN104556545A (en) * | 2013-10-29 | 2015-04-29 | 中国石油化工股份有限公司 | A method for microalgae to fix CO2 and treat oilfield sewage |
| CN104556547A (en) * | 2013-10-29 | 2015-04-29 | 中国石油化工股份有限公司 | A method of using microalgae to treat oilfield sewage and fix CO2 |
| CN104556544A (en) * | 2013-10-29 | 2015-04-29 | 中国石油化工股份有限公司 | A method of using microalgae to treat oilfield sewage and fix CO2 to produce biodiesel |
| CN104556548A (en) * | 2013-10-29 | 2015-04-29 | 中国石油化工股份有限公司 | A method of using diatoms to fix CO2 and treat oilfield sewage |
| CN106904745A (en) * | 2017-03-21 | 2017-06-30 | 中国科学院青岛生物能源与过程研究所 | A kind of thread oil-producing algae is in the environment to the application for the treatment of technical phenol pollution |
| CN111072215B (en) * | 2018-10-18 | 2021-11-12 | 中国石油化工股份有限公司 | Terephthalic acid wastewater treatment and resource utilization method |
| CN114307513B (en) * | 2021-11-23 | 2022-11-15 | 中国环境科学研究院 | Device and method for capturing and fixing dissipated carbon dioxide in sewage treatment plant |
| CN114231406B (en) * | 2021-12-16 | 2023-02-28 | 江苏通用环境工程有限公司 | Fungus-algae coupling integrated equipment and oil production and decontamination method |
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| CN1216147C (en) * | 2003-07-24 | 2005-08-24 | 孙建明 | Microalgae breeding equipment |
| CN100554185C (en) * | 2006-04-04 | 2009-10-28 | 中山大学 | Utilize the solidified algae ball dispose of sewage in the method for organo-tin compound |
| US20110081706A1 (en) * | 2009-10-02 | 2011-04-07 | TransAlgae Ltd | Method and system for efficient harvesting of microalgae and cyanobacteria |
| CN101838094B (en) * | 2009-11-13 | 2012-06-27 | 胜利油田胜利工程设计咨询有限责任公司 | Resourceful treatment method and device for oil-containing sludge in oil fields by microwave pyrolysis |
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Granted publication date: 20131225 Termination date: 20180131 |