CN105713925A - Method used for producing hydrogen by taking cellulose as raw material - Google Patents
Method used for producing hydrogen by taking cellulose as raw material Download PDFInfo
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Abstract
The invention provides a method used for producing hydrogen by taking cellulose as a raw material. The method comprises following steps: 1, microwave alkali digestion; 2, enzyme hydrolysis; 3, dark fermentation hydrogen production; 4, photo fermentation hydrogen production; and 5, purification. The method is high in hydrogen yield, hydrogen production efficiency, substrate utilization ratio, and energy conversion efficiency.
Description
Technical field
The invention belongs to biomass energy production technical field, be specifically related to a kind of utilize cellulose as the method for waste hydrogen.
Background technology
Hydrogen Energy is one of desirable clean energy resource, has caused the extensive attention of people.Biological hydrogen production utilizes microorganism catalysis dehydrogenation, produces the physiological mechanism of hydrogen molecule in metabolic process, by the sweat hydrogen making using Organic substance as substrate.Owing to whole process is without with mineral resources for raw material, environmental pollution is low and ecological effect is high, at present the research of biological hydrogen production is had become as focus.But, traditional method cost of material is high and product hydrogen rate is low so that biological hydrogen production development and application are restricted.By contrast, cellulose series biomass mainly includes agricultural crop straw and wild draft and xylophyta, is be distributed the most extensively on the earth and one of the most cheap Renewable resource, is highly suitable as the raw material of preparation regenerative resource.At present, the theoretical resources amount of whole nation straw is about 8.4 hundred million tons, can collect stock number and be about 700,000,000 tons,
Using cellulose series biomass as raw material, the method for fermentable hydrogen making is utilized to can be summarized as: first cellulose series biomass to be carried out pretreatment so that cellulose hydrolysis becomes reducing sugar；By fermentable, reducing sugar is changed into hydrogen subsequently.
Owing to, in cellulose series biomass, hemicellulose and lignin form network structure by covalent bond, being wrapped up wherein by cellulose, cellulose is difficult to contact with affiliated cellulase in processes.If be directly hydrolyzed with cellulase when pretreatment, the productivity of reducing sugar is generally below 20%.Therefore, for improving the conversion ratio of substrate, in pre-treatment step, generally first use Physical and/or chemical method to destroy the natural structure of cellulose series biomass, re-use cellulase and be hydrolyzed；Or, the method adopting microbial treatments enzymolysis, utilize cellulose-decomposing bacterium directly to convert cellulose into reducing sugar.The Physical used in pretreatment such as destroys cellulosic crystal structure by the method for mechanical activation comminution or steam explosion so that increase with the contact area of cellulase when sequential hydrolysis.Steam explosion or mechanical activation comminution are such as combined by the physical-chemical process used in pretreatment with Chemical treatment.Pretreatment use chemical method be mainly dilute acid pretreatment method and alkali facture (non-patent literature 1).Such as, CN102101647A discloses a kind of method from cellulose hydrogen making, the H that this process produces first with additional water-soluble Bronsted Lewis sour, water-soluble acid, solid acid or the reversible ionization of water self+Cellulose is hydrolyzed, and then hydrolyzate carries out hydro-thermal reformation hydrogen production again.Non-patent literature 2 utilizes microwave oven to carry out microwave-assisted alkali process, closes heating with desk-top electric furnace subsequently, thus being reducing sugar by cellulose hydrolysis.In pretreatment, the microbial treatments enzymatic isolation method of employing is such as: is inoculated in by white rot fungi in lignocellulose fluid medium and cultivates, through washing, dry after cellulose after pretreatment, then hydrogenogen nutrient salt solution is mixed with Trichoderma viride crude enzyme liquid, add pretreated cellulose, obtain simultaneous saccharification and fermentation and produce hydrogen culture medium (CN102321671A)；And utilize natural green Trichoderma spp. to replace commercial fibres element enzyme that cellulose is processed (CN102286538A).The shortcoming that above-mentioned cellulose pretreating process all exists process time length, Reducing sugar is low.
And for reducing sugar being changed into by fermentable the process of hydrogen, the Main Bottleneck problem of traditional dark fermentation and hydrogen production is that product hydrogen rate is low and efficient energy conversion is low, and containing the by-product such as a large amount of organic acid and alcohols in fermentation residual solution, not only waste energy but also pollute environment.Such as, the dark fermentation fermentation mode theory that CN102286538A uses produces the highest only 4mol/mol of hydrogen rate.Visible, simply use a kind of fermentation mode of dark fermentation, hydrogen generation efficiency can not obtain breakthrough raising.And although non-patent literature 2 have employed microwave-assisted alkali and processes, but, the document utilizes microwave oven as heating instrument, it is impossible to forms closed environment and produces the pretreatment condition of constant high temperature high pressure,. in the publication, Reducing sugar is the highest less than 3% (Fig. 1)；Additionally, due to the temperature and pressure of microwave oven is all difficult to control to, it is unfavorable for the promotion and application of technology；Especially, in the document, after cellulose series biomass produces and with the addition of 6g glucose in hydrogen substrate, obvious increase is there is no as producing hydrogen output compared with hydrogen substrate with the pure glucose of 6g, this shows the cellulose series biomass after document microwave pretreatment, can not effectively be utilized by hydrogen production with photosynthetic bacteria and carry out producing hydrogen.Dark fermentation is adopted to produce hydrogen with two steps that light fermentation combines although prior art also has, but, the starch based biomass that major part is all the small molecular sugar class (such as glucose, sucrose etc.) for simple in construction and easily utilization are studied, and lack the high-efficiency pretreatment method to cellulose series biomass and produce the research of hydrogen technique.
Visible, how by practical for the theory of biological hydrogen production, exploitation is sane and produces the method that hydrogen rate, hydrogen-producing speed, substrate utilization ratio and energy conversion efficiency are high, is still technical problem urgently to be resolved hurrily.
[non-patent literature 1] Inverting Cellulose Into Hydrogen By Biological Technology and prospect, " solar energy journal ", the 28th volume the 1st phase, in January, 2007.
Corn straw alkali treatment technology under [non-patent literature 2] microwave environment, " Zhejiang Agriculture science ", the 6th phase in 2012.
Summary of the invention
For solving above-mentioned technical problem, the invention provides a kind of method utilizing cellulose series biomass hydrogen making, described method comprises the steps of:
(1) microwave alkali is cleared up: carries out cellulose series biomass drying and pulverizes, be subsequently added dilute alkaline soln, clears up at microwave heating and carry out microwave heating auxiliary alkali in instrument and clear up；
(2) enzyme hydrolysis: utilize cellulase that the cellulose after step (1) is cleared up is hydrolyzed, it is thus achieved that cellulose after the hydrolysis containing fermentable reducing sugar；
(3) dark fermentation and hydrogen production: add the solution that step (2) obtains in dark fermentation reactor, access dark fermentation and hydrogen production strain and dark fermentation medium secretly ferments, gas-phase product (is mainly H2、CO2) derive；
(4) light fermentation and hydrogen production: dark fermentation tailing liquor precipitation that step (3) is obtained, centrifugal after, as the substrate of light fermentation and hydrogen production, access light fermentation and hydrogen production strain and light fermentation medium carry out light fermentation, gas-phase product (is mainly H2、CO2) derive；
(5) purification: the gas-phase product of step (3) and step (4) is merged, and to H2It is purified.
Specifically, the present invention is achieved through the following technical solutions:
1. the method utilizing cellulose series biomass hydrogen making, described method comprises the steps of:
(1) microwave alkali is cleared up: carries out cellulose series biomass drying and pulverizes, be subsequently added dilute alkaline soln, clears up at microwave heating and carry out microwave heating auxiliary alkali in instrument and clear up；
(2) enzyme hydrolysis: utilize cellulase that the cellulose after step (1) is cleared up is hydrolyzed, it is thus achieved that cellulose after the hydrolysis containing fermentable reducing sugar；
(3) dark fermentation and hydrogen production: add the solution that step (2) obtains in dark fermentation reactor, access dark fermentation and hydrogen production strain and dark fermentation medium secretly ferments, gas-phase product is derived；
(4) light fermentation and hydrogen production: dark fermentation tailing liquor precipitation that step (3) is obtained, centrifugal after, as the substrate of light fermentation and hydrogen production, access light fermentation and hydrogen production strain and light fermentation medium carry out light fermentation, gas-phase product is derived；
(5) purification: the gas-phase product of step (3) and step (4) is merged, and to H2It is purified.
2. the method as described in paragraph 1, wherein, described cellulose series biomass is selected from the trade waste of crops, the straw of wild herb or rich cellulose.
3. the method as described in paragraph 2, wherein, the straw of described crops is the straw of Semen Maydis, Semen Tritici aestivi, Oryza sativa L. or Caulis Sacchari sinensis, and the trade waste of described rich cellulose is corn cob, bagasse, Herba Eichhorniae.
4. the method as according to any one of paragraph 1-3, wherein, in step (1), after described drying is pulverized, the particle diameter of cellulose series biomass is≤1mm.
5. the method as according to any one of paragraph 1-3, wherein, in step (1), described dilute alkaline soln is: concentration is one or more in the sodium hydroxide of 0.1wt%-5.0wt%, potassium hydroxide, Lithium hydrate, barium hydroxide, manganous hydroxide, zinc hydroxide, sodium carbonate, potassium carbonate, Lithium carbonate solution or ammonia.
6. the method as according to any one of paragraph 1-5, wherein, in step (1), drying the dry weight of the cellulose series biomass after pulverizing with the mass ratio of the described dilute alkaline soln of addition is 1:100～10:100.
7. the method as according to any one of paragraph 1-6, wherein, in step (1), described microwave heating auxiliary alkali is cleared up and is carried out 5～30 minutes under the temperature of 100～150 DEG C, the pressure of 0.2～0.8MPa.
8. the method as according to any one of paragraph 1-7, wherein, in step (1), carries out described microwave pressurized, heated auxiliary alkali immediately after being mixed with dilute alkaline soln by the described cellulose series biomass dried after pulverizing and clears up.
9. the method as according to any one of paragraph 1-8, wherein, after the microwave alkali carrying out step (1) is cleared up, adjusts the pH of the digestion solution of acquisition to 4.0～5.0.
10. the method as according to any one of paragraph 1-9, wherein, in step (2), the mass ratio of the dry weight of affiliated cellulase and cellulose series biomass is 0.5:100.0～5.0:100.0.
11. such as the method according to any one of paragraph 1-10, wherein, in step (2), the temperature of enzyme hydrolysis is 35～45 DEG C, and the time of enzyme hydrolysis is 48～96 hours.
12. such as the method according to any one of paragraph 1-11, wherein, in step (3), described dark fermentation and hydrogen production strain is selected from one or more in the group being made up of Clostridium butyricum, clostridium perfringen, enterobacter cloacae, Clostridium baratii, bacillus acidocldarius, Clostridium thermocellum.
13. such as the method according to any one of paragraph 1-12, wherein, consisting of of the dark fermentation medium described in step (3): 4g/L peptone, 0.5g/LL-cysteine, 4g/LNaCl, 0.1g/LMgCl2、0.1g/LFeCl2、1.5g/LK2HPO4, 10mL vitamin liquid and 10mL liquid microelement；Wherein, the composition of described vitamin liquid is: 0.025g/L ascorbic acid, 0.02g/L citric acid, 0.01g/L folic acid and 0.01g/L para-amino benzoic acid；The composition of described liquid microelement is: 0.01g/LMnCl2、0.05g/LZnCl2、0.01g/LH3BO3、0.01g/LCaCl2And 0.01g/LAlK (SO4)2。
14. such as the method according to any one of paragraph 1-13, wherein, in step (3), the inoculum concentration of described dark fermentation and hydrogen production strain is: the seed culture fluid of strain accounts for 10% (v/v) of whole fermentation volume, and described in described seed culture fluid, the concentration of strain seed is not less than 2.0g/L.
15. such as the method according to any one of paragraph 1-14, wherein, in step (3), the fermentation liquid temperature of described dark fermentation is 30 DEG C～37 DEG C.
16. such as the method according to any one of paragraph 1-15, wherein, in step (3), the pH value of described dark fermentation liquid is 6.0～7.0.
17. such as the method according to any one of paragraph 1-16, wherein, the dark fermentation tailing liquor precipitation that step (3) is obtained, centrifugal after, dilute 2-6 times with deionized water.
18. such as the method according to any one of paragraph 1-17, wherein, in step (4), described smooth fermentation and hydrogen production strain is selected from one or more of Rhodospirillum, Rhodopseudomonas or Erythrobacillus antibacterial.
19. such as the method according to any one of paragraph 1-18, wherein, in step (4), described smooth fermentation and hydrogen production strain is selected from one or more in Crimson rhodospirillum, Rhodopseudomonas palustris, capsula Rhodopseudomonas, Rhodobacter.
20. such as the method according to any one of paragraph 1-19, wherein, in step (4), described smooth fermentation medium is: 0.5g/LKH2PO4、0.6g/LK2HPO4、0.2g/LNaCl、0.2g/LMgSO4、0.05g/LCaCl2·2H2O、2.0g/LNaHCO3, 1.87g/L sodium glutamate, 1.0mL vitamin liquid and 1.0mL liquid microelement；Wherein, the composition of described liquid microelement is: 2.0g/LEDTA-2Na, 2.0g/LFeSO4 7H2O、0.1g/LZnCl2、0.05g/LCu(NO3)2·5H2O、0.1g/LMnCl2·4H2O and 0.02g/LNiCl2·6H2O；The composition of described vitamin liquid is: 0.1g/L biotin, 0.35g/L nicotinic acid, 0.2g/L para-aminotoluene, 0.1g/L calcium pantothenate and 0.05g/L vitamin B12.
21. such as the method according to any one of paragraph 1-10, wherein, in step (4), add light fermentation medium according to the volume equal with the dark fermentation tailing liquor after dilution.
22. such as the method according to any one of paragraph 1-21, wherein, in step (4), the inoculum concentration of described smooth fermentation and hydrogen production strain is: the seed culture fluid of strain accounts for 10% (v/v) of whole fermentation volume, and described in described seed culture fluid, the concentration of strain seed is not less than 2.0g/L.
23. such as the method according to any one of paragraph 1-22, wherein, in step (4), the fermentation liquid temperature of described light fermentation is 28 DEG C～35 DEG C.
24. such as the method according to any one of paragraph 1-23, wherein, in step (4), the pH value of described light fermentation is 6.0～7.0.
25. such as the method according to any one of paragraph 1-24, wherein, in step (4), the illuminance of described light fermentation is 2000lux～10000lux.
Beneficial effect
The microwave alkali of the present invention is cleared up step and is used the collaborative microwave heating of aqueous slkali to clear up cellulose biomass, microwave plasma conduction and polar molecule is utilized to rotate principle of heating, adopt material inside and outside mode of heating simultaneously, have that firing rate is fast and uniform feature, collaborative dilute alkaline soln processes clears up cellulose series biomass, efficiently destroy the surface texture of biomass and the cellulose hemicellulose lignin composite construction of inside, hemicellulose and lignin is made fully to rupture dissolving, reduce cellulosic degree of crystallinity, part hemicellulose is resolved into xylose, the monosaccharide such as mannose, make cellulose fully contact with cellulase simultaneously and be degraded to glucose.Such processing method required time is short, only 5-30 minute, avoid dilute alkaline soln that the glucose and xylose in reducing sugar is degraded into material that 5 hydroxymethyl furfural, furfural and formic acid etc. are harmful to subsequent fermentation further, the reducing sugar obtained is used directly for subsequent fermentation and produces, reduce the operations such as detoxification, simplification of flowsheet.The micro-wave digestion step adopted in the present invention can realize the pretreatment condition of High Temperature High Pressure in effective airtight digestion space.Especially, when the temperature constant of micro-wave digestion is at 100～150 DEG C, when pressure is 0.2～0.8MPa (gauge pressure), the productivity of reducing sugar can reach about 600mg/g cellulose.Being different from the non-heated at constant temperature in open spaces of common microwave oven, the present invention utilizes microwave heating to clear up instrument and is not only easy to control, and is capable of the cellulose degradation efficiency and the Reducing sugar that significantly improve.Additionally, compared with traditional steam and heating in water bath, the micro-wave digestion step of the present invention carries out in hermetic container, and energy consumption is low, and condition is relatively mild, and the response time is short, reduce production cost.
On the other hand, two steps that the present invention couples with light fermentation by utilizing dark fermentation produce hydrogen, and the entirety significantly improving sweat produces hydrogen rate, hydrogen-producing speed, substrate utilization ratio and energy conversion efficiency.The carrying out of light fermentation makes the by-products such as the small molecular organic acid in dark fermentation tailing liquor almost be fully utilized, and significantly reduces the pollutant emission in biological hydrogen production process.Specifically, after dark fermentation ends, the light zymogenous bacteria that light fermentation and hydrogen production step uses can utilize the small molecular organic acid by-products such as the acetic acid remained in dark fermentation tailing liquor, butanoic acid again to ferment under illumination condition, generates H2And CO2(reaction equation 1).Two steps that dark fermentation couples with light fermentation produce hydrogen method can produce the hydrogen rate 4molH from simple dark fermentation by the theory of hexose2/ mol hexose brings up to 12molH2/ mol hexose (reaction equation 2), improves the theory of overall sweat and actual product hydrogen rate breakthroughly.
(reaction equation 1)
C6H12O6+6H2O→12H2+6CO2(reaction equation 2)
Accompanying drawing explanation
Fig. 1 is the process chart according to the inventive method.
Detailed description of the invention
Set forth the present invention in detail below.
The conventional reactor that dark fermentation reactor is prior art in apparatus of the present invention, such as plug flow reactor (PFR), complete mix flow (CSTR), Anaerobic Contact reactor (ACR), upflow anaerobic sludge blanket process (UASB), upflow solids reactor (USR), expanded granular sludge bed (EGSB), internal-circulation anaerobic reactor (IC), external circular anaerobic processes (EC), anaerobic batch reactor (ASBR), baffled reactor (ABR), anaerobic filter (AF), fiberfill bed (FPB), hybrid anaerobic reactor (UBF), anaerobic fluidized bed (FBR), anaerobic expanded bed (ESB), dry fermentation reactor (DA), or known in the art other is appropriate to the device of dark fermentation reaction.
Light fermentation reactor in apparatus of the present invention is closed photo bioreactor, can be column formula bioreactor or tubular type bioreactor, board-like bioreactor, built-in light-source fermentation pot type bioreactor or optical fibers bioreactor, the built-in fermentation pot type bioreactor of preferred light source, or known in the art other be appropriate to the device of light fermentation reaction.
Microwave alkali for the present invention clears up step (1), and those skilled in the art according to the record of this specification, can properly select the kind of cellulose series biomass, dilute alkaline soln and addition thereof and clear up condition accordingly.In an embodiment of the invention, cellulose series biomass is the herbaceous plant of rich cellulose, its part or its industrial treatment garbage, include but not limited to the straw of the crops such as Semen Maydis, Semen Tritici aestivi, Oryza sativa L. and Caulis Sacchari sinensis and wild herb and the various trade wastes of the rich cellulose such as corn cob, bagasse, Herba Eichhorniae.In an embodiment of the invention, after described drying is pulverized, the particle diameter of cellulose series biomass is≤1mm.In an embodiment of the invention, described dilute alkaline soln is: concentration is one or more in the sodium hydroxide of 0.1wt%-5.0wt%, potassium hydroxide, Lithium hydrate, barium hydroxide, manganous hydroxide, zinc hydroxide, sodium carbonate, potassium carbonate, Lithium carbonate solution or ammonia.In an embodiment of the invention, drying the dry weight of the cellulose series biomass after pulverizing with the mass ratio of the described dilute alkaline soln of addition is 1:100～10:100.In one embodiment, described microwave heating carries out 5～30 minutes under the temperature of 100～150 DEG C, the pressure of 0.2～0.8MPa.In a preferred embodiment, carry out described microwave pressurized, heated auxiliary alkali immediately after being mixed with dilute alkaline soln by the described cellulose series biomass dried after pulverizing to clear up.Make microwave heating treatment and alkaline solution treatment work in coordination with carry out improving biomass clear up efficiency.
For the enzyme hydrolysis step (2) of the present invention, those skilled in the art according to the record of this specification, can properly select cellulase addition and corresponding enzyme hydrolysis condition.In one embodiment, after the microwave alkali carrying out step (1) is cleared up, the pH of the digestion solution of acquisition is adjusted to 4.0～5.0.Described pH adjusts can use acid customary in the art, for instance but it is not limited to hydrochloric acid, sulphuric acid, sulfurous acid, nitric acid, phosphoric acid, selenic acid, perchloric acid etc..In one embodiment, the mass ratio of the dry weight of affiliated cellulase and cellulose series biomass is 0.5:100.0～5.0:100.0.In one embodiment, the temperature of enzyme hydrolysis is 35～45 DEG C.In one embodiment, the time of enzyme hydrolysis is 48～96 hours.
For the dark fermentation and hydrogen production step (3) of the present invention, those skilled in the art can properly select the composition of dark fermentation medium, dark fermentation medium addition, the kind of dark fermentation and hydrogen production strain, the inoculum concentration of dark fermentation and hydrogen production strain and corresponding dark fermentation condition etc. according to the record of this specification.In an embodiment of the invention, the consisting of of dark fermentation medium: 4g/L peptone, 0.5g/LL-cysteine, 4g/LNaCl, 0.1g/LMgCl2、0.1g/LFeCl2、1.5g/LK2HPO4, 10mL vitamin liquid and 10mL liquid microelement；Wherein, the composition of described vitamin liquid is: 0.025g/L ascorbic acid, 0.02g/L citric acid, 0.01g/L folic acid and 0.01g/L para-amino benzoic acid；The composition of described liquid microelement is: 0.01g/LMnCl2、0.05g/LZnCl2、0.01g/LH3BO3、0.01g/LCaCl2And 0.01g/LAlK (SO4)2.In an embodiment of the invention, dark fermentation medium is added according to the volume equal with the solution obtained after enzyme hydrolysis step (2).In an embodiment of the invention, dark fermentation and hydrogen production strain is for being selected from one or more in the group being made up of Clostridium butyricum (Clostridiumbutyricum), clostridium perfringen (Enterobacteraerogenes), enterobacter cloacae (Enterobactercloacae), Clostridium thermocellum (Clostridiumthermocellum), Clostridium baratii (Clostridiumbarati), bacillus acidocldarius (Bacillusthermophilus).In an embodiment of the invention, the inoculum concentration of dark fermentation and hydrogen production strain is: the seed culture fluid of strain accounts for 10% (v/v) of whole fermentation volume, and described in described seed culture fluid, the concentration of strain seed is not less than 2.0g/L.In an embodiment of the invention, the fermentation liquid temperature of dark fermentation is 30 DEG C～37 DEG C.In an embodiment of the invention, the fermentation liquid pH value of dark fermentation is 6.0～7.0.
For light fermentation and hydrogen production step (4) of the present invention, those skilled in the art can properly select the dilute strength of dark fermentation tailing liquor, the composition of light fermentation medium, the addition of light fermentation medium, the kind of light fermentation and hydrogen production strain, the inoculum concentration of light fermentation and hydrogen production strain and corresponding light fermentation condition etc. according to the record of this specification.In an embodiment of the invention, the dark fermentation tailing liquor precipitation that step (3) is obtained, centrifugal after, dilute 2-6 times with deionized water.In an embodiment of the invention, described smooth fermentation medium is: 0.5g/LKH2PO4、0.6g/LK2HPO4、0.2g/LNaCl、0.2g/LMgSO4、0.05g/LCaCl2·2H2O、2.0g/LNaHCO3, 1.87g/L sodium glutamate, 1.0mL vitamin liquid and 1.0mL liquid microelement；Wherein, the composition of described liquid microelement is: 2.0g/LEDTA-2Na, 2.0g/LFeSO4·7H2O、0.1g/LZnCl2、0.05g/LCu(NO3)2·5H2O、0.1g/LMnCl2·4H2O and 0.02g/LNiCl2·6H2O；The composition of described vitamin liquid is: 0.1g/L biotin, 0.35g/L nicotinic acid, 0.2g/L para-aminotoluene, 0.1g/L calcium pantothenate and 0.05g/L vitamin B12.In an embodiment of the invention, light fermentation medium is added according to the volume equal with the dark fermentation tailing liquor after dilution.In an embodiment of the invention, light fermentation and hydrogen production strain is selected from Rhodospirillum (Rhodospirillum), Rhodopseudomonas (Rhodopseudanonas) and Erythrobacillus (Rhodobacter), for instance but it is not limited to one or more in Crimson rhodospirillum (Rhodospirillumrubrum), Rhodopseudomonas palustris (Rhodopseudanonaspalustris), capsula Rhodopseudomonas (Rhodopseudomonascapsulata), Rhodobacter (Rhodobactersphaeroides).In an embodiment of the invention, the inoculum concentration of light fermentation and hydrogen production strain is: the seed culture fluid of strain accounts for 10% (v/v) of whole fermentation volume, and described in described seed culture fluid, the concentration of strain seed is not less than 2.0g/L.In an embodiment of the invention, the fermentation liquid temperature of light fermentation is 28 DEG C～35 DEG C.In an embodiment of the invention, light fermentation pH value is 6.0～7.0.In an embodiment of the invention, the illuminance of light fermentation is 2000lux～10000lux.
Embodiment
Being better understood the present invention by means of following embodiment, these embodiments are only used for illustrating the present invention, are not necessarily to be construed as limitation of the present invention.
The cellulase that the embodiment of the present invention uses is Sigma-Aldrich's C1794 model, rice straw takes from Hangzhou, Zhejiang province suburban area peasant household, wheat stalk takes from Beijing Suburb peasant household, corn straw takes from Beijing Suburb peasant household, instrument cleared up by the microwave heating used in the embodiment of the present invention is Shanghai EU Apparatus Technology Development Co., Ltd.'s WX-8000 model, and illumination adopts Shanghai to win fast experiment company limited SPX-300I-G model micro computer illumination box.
The dark fermentation reactor that the embodiment of the present invention uses is internal-circulation anaerobic reactor；Light fermentation reactor is closed photo bioreactor.
The bacterium source that the embodiment of the present invention adopts is:
Clostridium butyricum: Zhejiang Microbe Inst., is numbered 20036；
Clostridium perfringen: Zhejiang Microbe Inst., is numbered 20051；
Enterobacter cloacae: Zhejiang Microbe Inst., is numbered 10450；
Rhodopseudomonas palustris: Zhejiang Microbe Inst., is numbered 15007；
Rhodobacter: Zhejiang Microbe Inst., is numbered 18626；
Capsula Rhodopseudomonas: Zhejiang Microbe Inst., is numbered 13366.
In below example and comparative example, composed as follows without other special instruction, the dark fermentation medium that uses and light fermentation medium:
Dark fermentation medium: 4g/L peptone, 0.5g/LL-cysteine, 4g/LNaCl, 0.1g/LMgCl2、0.1g/LFeCl2、1.5g/LK2HPO4, 10mL vitamin liquid and 10mL liquid microelement；Wherein, the composition of described vitamin liquid is: 0.025g/L ascorbic acid, 0.02g/L citric acid, 0.01g/L folic acid and 0.01g/L para-amino benzoic acid；The composition of described liquid microelement is: 0.01g/LMnCl2、0.05g/LZnCl2、0.01g/LH3BO3、0.01g/LCaCl2And 0.01g/LAlK (SO4)2。
Light fermentation medium: 0.5g/LKH2PO4、0.6g/LK2HPO4、0.2g/LNaCl、0.2g/LMgSO4、0.05g/LCaCl2·2H2O、2.0g/LNaHCO3, 1.87g/L sodium glutamate, 1.0mL vitamin liquid and 1.0mL liquid microelement；Wherein, the composition of described liquid microelement is: 2.0g/LEDTA-2Na, 2.0g/LFeSO4·7H2O、0.1g/LZnCl2、0.05g/L Cu(NO3)2·5H2O、0.1g/LMnCl2·4H2O and 0.02g/LNiCl2·6H2O；The composition of described vitamin liquid is: 0.1g/L biotin, 0.35g/L nicotinic acid, 0.2g/L para-aminotoluene, 0.1g/L calcium pantothenate and 0.05g/L vitamin B12.
In various embodiments of the present invention, calculate according to formula 1 and produce hydrogen rate:
Produce hydrogen rate=(in volume (mL) × step (3) gas-phase product of step (3) generation gas the volumetric concentration (%) of hydrogen in volume (mL) × step (4) gas-phase product of the volumetric concentration (%) of hydrogen+step (4) generation gas) total volatile solid weight (Totalvalidatesolid, TVS) (g) (formula 1) of/substrate
In various embodiments of the present invention, measure the organic acid in fermentation tailing liquor according to following method:
The gas chromatograph (GC, model: ThermoFiniganTrace2000, the U.S.) with hydrogen flame ionization detector (FID) is used to measure liquid phase ingredient and content thereof.Chromatographic column model in gas chromatograph is DB-Waxtre (φ 5mm × 2m), tests Program temperature-rising method: initial temperature 50 DEG C, keeps 2min, and heating rate is 10 DEG C/min, and final temperature is 210 DEG C, stops 2min.During operation, carrier gas is He, and flow is 50ml/min；H2With air mass flow respectively 35ml/min and 350ml/min, detector temperature is 280 DEG C, and column temperature is 240 DEG C.Test specimens pH is adjusted to about 2.0, and sample size is 1.0 μ l.Containing concentration in experiment Plays solution is the ethanol of 0.05% (V/V), acetic acid, propanoic acid, butanoic acid, valeric acid and caproic acid, after test sample obtains corresponding chromatogram, contrasts, by appearance time and peak area, each composition and the content thereof that obtain fermentation liquid.
In various embodiments of the present invention, clear up the concentration of reduced sugar in the digestion solution of acquisition according to the mensuration microwave acid of following method:
The bio-sensing analyser (Shandong Province academy sciences Biology Research Institute SBA-40E) with glucose enzyme membrane is used to measure concentration of reduced sugar.First pass through and into 20 μ L standard specimens (100mg/100mL glucose solution), instrument is demarcated, then enter 20 μ L detected samples again and measure concentration of reduced sugar.If the concentration of reduced sugar in detected sample is higher than 100mg/100mL, then by adding deionized water, it is measured again when concentration of reduced sugar is diluted to lower than 100mg/100mL.
Embodiment 1: utilize rice straw hydrogen making
(1) microwave alkali is cleared up: by dry pulverize after rice straw (particle diameter≤1mm) mix with the ratio that mass ratio is 2:100 of sodium hydroxide solution according to the dry weight of cellulose series biomass with the sodium hydroxide solution that concentration is 1.0wt%, microwave heating clear up in instrument in 140 DEG C, pressure be 0.2～0.7MPa when pressurized, heated clear up 15 minutes.
(2) enzyme hydrolysis: the pH of the digestion solution that step (1) is obtained by use 6mol/L hydrochloric acid is adjusted to 4.5, it is that 4:100 adds cellulase in digestion solution according to the mass ratio of cellulase Yu the dry weight of cellulose series biomass, enzyme hydrolysis 84 hours at 45 DEG C.Concentration of reduced sugar in solution after enzymolysis is measured (table 1).
(3) dark fermentation and hydrogen production: add the solution after step (2) enzyme hydrolysis in dark fermentation reactor, dark fermentation medium is added according to the volume ratio that solution after dark fermentation medium and enzyme hydrolysis is 1:1, accessing dark fermentation and hydrogen production strain subsequently, the inoculum concentration of described dark fermentation and hydrogen production strain is the 10% of whole fermentation volume；Described dark fermentation and hydrogen production strain is Clostridium butyricum, and the fermentation liquid temperature controlling dark fermentation is 33 DEG C, and dark fermentation pH value is 6.8, keeps dark anaerobic environment, carries out dark fermentation and hydrogen production.No longer produce hydrogen and be considered as fermentation ends.Gas-phase product H is collected after fermentation ends2、CO2, liquid product is dark fermentation tailing liquor, containing the small molecular organic acid such as acetic acid, butanoic acid in described dark fermentation tailing liquor.
(4) light fermentation and hydrogen production: with rotating speed for the 8000rpm dark fermentation tailing liquor pelleting centrifugation 10 minutes to step (3), and dilute 3 times with deionized water, add light fermentation medium according to the volume ratio that dark fermentation tailing liquor is 1:1 after light fermentation medium and dilution subsequently, and access light fermentation and hydrogen production strain.Described smooth fermentation and hydrogen production strain is Rhodopseudomonas palustris, and the inoculum concentration of described smooth fermentation and hydrogen production strain is the 10% of whole fermentation volume；The fermentation liquid temperature controlling light fermentation is 31 DEG C, and light fermentation pH value is 7.0, and illuminance is 6000lux, keeps anaerobic environment, carries out light fermentation and hydrogen production.No longer produce hydrogen and be considered as fermentation ends.Gas-phase product H is collected after fermentation ends2And CO2。
(5) purification: the gas-phase product of step (3) and step (4) is merged, and to H2It is purified, it is thus achieved that H2Product.
The small molecular organic acids such as acetic acid in the dark fermentation tailing liquor of the present embodiment step (2), butanoic acid are almost fully utilized.It is 388ml/gTVS that the present embodiment obtains producing hydrogen rate.
Embodiment 2: utilize corn straw hydrogen making
(1) microwave alkali is cleared up: by dry pulverize after corn straw (particle diameter≤1mm) mix with the ratio that mass ratio is 4:100 of potassium hydroxide solution according to the dry weight of cellulose series biomass with the potassium hydroxide solution that concentration is 2.0wt%, microwave heating clear up in instrument in 145 DEG C, pressure be 0.2～0.76MPa when pressurized, heated clear up 20 minutes.
(2) enzyme hydrolysis: the pH of the digestion solution that step (1) is obtained by use 6mol/L dilute sulfuric acid is adjusted to 4.8, it is that 3:100 adds cellulase in digestion solution according to the mass ratio of cellulase Yu the dry weight of cellulose series biomass, enzyme hydrolysis 96 hours at 40 DEG C.
(3) dark fermentation and hydrogen production: add the solution after step (2) enzyme hydrolysis in dark fermentation reactor, dark fermentation medium is added according to the volume ratio that solution after dark fermentation medium and enzyme hydrolysis is 1:1, accessing dark fermentation and hydrogen production strain subsequently, the inoculum concentration of described dark fermentation and hydrogen production strain is the 10% of whole fermentation volume；Described dark fermentation and hydrogen production strain is clostridium perfringen, and the fermentation liquid temperature controlling dark fermentation is 31 DEG C, and dark fermentation pH value is 6.6, keeps dark anaerobic environment, carries out dark fermentation and hydrogen production.No longer produce hydrogen and be considered as fermentation ends.Gas-phase product H is collected after fermentation ends2、CO2, liquid product is dark fermentation tailing liquor, containing the small molecular organic acid such as acetic acid, butanoic acid in described dark fermentation tailing liquor.
(4) light fermentation and hydrogen production: with rotating speed for the 8000rpm dark fermentation tailing liquor pelleting centrifugation 10 minutes to step (3), and dilute 3 times with deionized water, add light fermentation medium according to the volume ratio that dark fermentation tailing liquor is 1:1 after light fermentation medium and dilution subsequently, and access light fermentation and hydrogen production strain.Described smooth fermentation and hydrogen production strain is Rhodobacter, and the inoculum concentration of described smooth fermentation and hydrogen production strain is the 10% of whole fermentation volume；The fermentation liquid temperature controlling light fermentation is 28 DEG C, and light fermentation pH value is 6.0, and illuminance is 8000lux, keeps anaerobic environment, carries out light fermentation and hydrogen production.No longer produce hydrogen and be considered as fermentation ends.Gas-phase product H is collected after fermentation ends2And CO2。
(5) purification: the gas-phase product of step (3) and step (4) is merged, and to H2It is purified, it is thus achieved that H2Product.
The small molecular organic acids such as acetic acid in the dark fermentation tailing liquor of the present embodiment step (2), butanoic acid are almost fully utilized.It is 463ml/gTVS that the present embodiment obtains producing hydrogen rate.
Embodiment 3: utilize wheat stalk hydrogen making
(1) microwave alkali is cleared up: by dry pulverize after wheat stalk (particle diameter≤1mm) mix with the ratio that mass ratio is 5:100 of ammonia spirit according to the dry weight of cellulose series biomass with the ammonia spirit that concentration is 3.0wt%, microwave heating clear up in instrument in 135 DEG C, pressure be 0.2～0.6MPa when pressurized, heated clear up 10 minutes.
(2) enzyme hydrolysis: the pH of the digestion solution that step (1) is obtained by use 6mol/L phosphoric acid is adjusted to 4.2, it is that 2.5:100 adds cellulase in digestion solution according to the mass ratio of cellulase Yu the dry weight of cellulose series biomass, enzyme hydrolysis 84 hours at 39 DEG C.
(3) dark fermentation and hydrogen production: add the solution after step (2) enzyme hydrolysis in dark fermentation reactor, dark fermentation medium is added according to the volume ratio that solution after dark fermentation medium and enzyme hydrolysis is 1:1, accessing dark fermentation and hydrogen production strain subsequently, the inoculum concentration of described dark fermentation and hydrogen production strain is the 10% of whole fermentation volume；Described dark fermentation and hydrogen production strain is enterobacter cloacae, and the fermentation liquid temperature controlling dark fermentation is 34 DEG C, and dark fermentation pH value is 6.0, keeps dark anaerobic environment, carries out dark fermentation and hydrogen production.No longer produce hydrogen and be considered as fermentation ends.Gas-phase product H is collected after fermentation ends2、CO2, liquid product is dark fermentation tailing liquor, containing the small molecular organic acid such as acetic acid, butanoic acid in described dark fermentation tailing liquor.
(4) light fermentation and hydrogen production: with rotating speed for the 8000rpm dark fermentation tailing liquor pelleting centrifugation 10 minutes to step (3), and dilute 3 times with deionized water, add light fermentation medium according to the volume ratio that dark fermentation tailing liquor is 1:1 after light fermentation medium and dilution subsequently, and access light fermentation and hydrogen production strain.Described smooth fermentation and hydrogen production strain is capsula Rhodopseudomonas, and the inoculum concentration of described smooth fermentation and hydrogen production strain is the 10% of whole fermentation volume；The fermentation liquid temperature controlling light fermentation is 35 DEG C, and light fermentation pH value is 6.0, and illuminance is 3000lux, keeps anaerobic environment, carries out light fermentation and hydrogen production.No longer produce hydrogen and be considered as fermentation ends.Gas-phase product H is collected after fermentation ends2And CO2。
(5) purification: the gas-phase product of step (3) and step (4) is merged, and to H2It is purified, it is thus achieved that H2Product.
The small molecular organic acids such as acetic acid in the dark fermentation tailing liquor of the present embodiment step (2), butanoic acid are almost fully utilized.It is 426ml/gTVS that the present embodiment obtains producing hydrogen rate.
Comparative example 1
Adopting the microwave oven in similar non-patent literature 2 to process (high fire 6min) replaces microwave heating to clear up process, and adopts and the step of the enzyme hydrolysis that embodiment 1 is identical, dark fermentation and hydrogen production and light fermentation and hydrogen production, purification.The concentration of enzyme hydrolysis reducing sugar is measured.Result is as shown in table 1.
Comparative example 2-5
Adopting identical step with embodiment 1, the parameter according to table 1 changes heating-up temperature and heat time heating time respectively, and the concentration of the reducing sugar in solution after enzyme hydrolysis is measured.Result is as shown in table 1.
Parameter that table 1 respectively processes and result
Claims (8)
1. the method utilizing cellulose series biomass hydrogen making, described method comprises the steps of:
(1) microwave alkali is cleared up: carries out cellulose series biomass drying and pulverizes, be subsequently added dilute alkaline soln, clears up at microwave heating and carry out microwave heating auxiliary alkali in instrument and clear up；
(2) enzyme hydrolysis: utilize cellulase that the cellulose after step (1) is cleared up is hydrolyzed, it is thus achieved that cellulose after the hydrolysis containing fermentable reducing sugar；
(3) dark fermentation and hydrogen production: add the solution that step (2) obtains in dark fermentation reactor, access dark fermentation and hydrogen production strain and dark fermentation medium secretly ferments, gas-phase product is derived；
(4) light fermentation and hydrogen production: dark fermentation tailing liquor precipitation that step (3) is obtained, centrifugal after, as the substrate of light fermentation and hydrogen production, access light fermentation and hydrogen production strain and light fermentation medium carry out light fermentation, gas-phase product is derived；
(5) purification: the gas-phase product of step (3) and step (4) is merged, and to H2It is purified.
2. the method for claim 1, wherein described cellulose series biomass selected from the trade waste of crops, the straw of wild herb or rich cellulose；
Preferably, the straw of described crops is the straw of Semen Maydis, Semen Tritici aestivi, Oryza sativa L. or Caulis Sacchari sinensis, and the trade waste of described rich cellulose is corn cob, bagasse, Herba Eichhorniae.
3. method as claimed in claim 1 or 2, it is one or more that described step (1) has in following condition:
After described drying is pulverized, the particle diameter of cellulose series biomass is≤1mm；
Described dilute alkaline soln is: concentration is one or more in the sodium hydroxide of 0.1wt%-5.0wt%, potassium hydroxide, Lithium hydrate, barium hydroxide, manganous hydroxide, zinc hydroxide, sodium carbonate, potassium carbonate, Lithium carbonate solution or ammonia；
Drying the dry weight of the cellulose series biomass after pulverizing with the mass ratio of the described dilute alkaline soln of addition is 1:100～10:100；
Described microwave heating auxiliary alkali is cleared up and is carried out 5～30 minutes under the temperature of 100～150 DEG C, the pressure of 0.2～0.8MPa；
Carry out described microwave pressurized, heated auxiliary alkali immediately after being mixed with dilute alkaline soln by the described cellulose series biomass dried after pulverizing to clear up.
4. the method as according to any one of claim 1-3, wherein, after the microwave alkali carrying out step (1) is cleared up, adjusts the pH of the digestion solution of acquisition to 4.0～5.0.
5. the method as according to any one of claim 1-4, it is one or more that described step (2) has in following condition:
The mass ratio of the dry weight of affiliated cellulase and cellulose series biomass is 0.5:100.0～5.0:100.0；
The temperature of enzyme hydrolysis is 35～45 DEG C, and the time of enzyme hydrolysis is 48～96 hours.
6. the method for claim 1, it is one or more that described step (3) has in following condition:
Described dark fermentation and hydrogen production strain is selected from one or more in the group being made up of Clostridium butyricum, clostridium perfringen, enterobacter cloacae, Clostridium baratii, bacillus acidocldarius, Clostridium thermocellum；
Consisting of of described dark fermentation medium: 4g/L peptone, 0.5g/LL-cysteine, 4g/LNaCl, 0.1g/LMgCl2、0.1g/LFeCl2、1.5g/LK2HPO4, 10mL vitamin liquid and 10mL liquid microelement；Wherein, the composition of described vitamin liquid is: 0.025g/L ascorbic acid, 0.02g/L citric acid, 0.01g/L folic acid and 0.01g/L para-amino benzoic acid；The composition of described liquid microelement is: 0.01g/LMnCl2、0.05g/LZnCl2、0.01g/LH3BO3、0.01g/LCaCl2And 0.01g/LAlK (SO4)2；
The inoculum concentration of described dark fermentation and hydrogen production strain is: the seed culture fluid of strain accounts for 10% (v/v) of whole fermentation volume, and described in described seed culture fluid, the concentration of strain seed is not less than 2.0g/L；
The fermentation liquid temperature of described dark fermentation is 30 DEG C～37 DEG C；
The pH value of described dark fermentation liquid is 6.0～7.0.
7. the method for claim 1, wherein the dark fermentation tailing liquor precipitation that step (3) is obtained, centrifugal after, dilute 2-6 times with deionized water.
8. the method for claim 1, it is one or more that described step (4) has in following condition:
Described smooth fermentation and hydrogen production strain be selected from Rhodospirillum, Rhodopseudomonas or Erythrobacillus antibacterial one or more；
Described smooth fermentation and hydrogen production strain is selected from one or more in Crimson rhodospirillum, Rhodopseudomonas palustris, capsula Rhodopseudomonas, Rhodobacter；
Described smooth fermentation medium is: 0.5g/LKH2PO4、0.6g/LK2HPO4、0.2g/LNaCl、0.2g/LMgSO4、0.05g/LCaCl2·2H2O、2.0g/LNaHCO3, 1.87g/L sodium glutamate, 1.0mL vitamin liquid and 1.0mL liquid microelement；Wherein, the composition of described liquid microelement is: 2.0g/LEDTA-2Na, 2.0g/LFeSO4·7H2O、0.1g/LZnCl2、0.05g/LCu(NO3)2·5H2O、0.1g/LMnCl2·4H2O and 0.02g/LNiCl2·6H2O；The composition of described vitamin liquid is: 0.1g/L biotin, 0.35g/L nicotinic acid, 0.2g/L para-aminotoluene, 0.1g/L calcium pantothenate and 0.05g/L vitamin B12；
Light fermentation medium is added according to the volume equal with the dark fermentation tailing liquor after optional dilution；
The inoculum concentration of described smooth fermentation and hydrogen production strain is: the seed culture fluid of strain accounts for 10% (v/v) of whole fermentation volume, and described in described seed culture fluid, the concentration of strain seed is not less than 2.0g/L；
The fermentation liquid temperature of described light fermentation is 28 DEG C～35 DEG C；
The pH value of described light fermentation is 6.0～7.0；
The illuminance of described light fermentation is 2000lux～10000lux.
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| CN114480080A (en) * | 2022-01-26 | 2022-05-13 | 河南农业大学 | Method and system for producing hydrogen by synchronous saccharification dark-light combined biological fermentation |
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