CN107022574A - Mechanical crushing for stalk anaerobic fermentation combines concurrent oxidation and aquoiysis preprocess method - Google Patents
Mechanical crushing for stalk anaerobic fermentation combines concurrent oxidation and aquoiysis preprocess method Download PDFInfo
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- 238000000855 fermentation Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000003647 oxidation Effects 0.000 title claims abstract description 33
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 33
- 230000007062 hydrolysis Effects 0.000 claims abstract description 49
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 49
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 239000002002 slurry Substances 0.000 claims abstract description 25
- 239000002054 inoculum Substances 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000005273 aeration Methods 0.000 claims abstract description 17
- 239000010902 straw Substances 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 11
- 239000007787 solid Substances 0.000 claims abstract description 8
- 230000003301 hydrolyzing effect Effects 0.000 claims description 23
- 239000012535 impurity Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 5
- 238000007605 air drying Methods 0.000 claims description 4
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- 241000209140 Triticum Species 0.000 claims description 2
- 235000021307 Triticum Nutrition 0.000 claims description 2
- 240000008042 Zea mays Species 0.000 claims description 2
- 235000016383 Zea mays subsp huehuetenangensis Nutrition 0.000 claims description 2
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 2
- 230000001186 cumulative effect Effects 0.000 claims description 2
- 235000009973 maize Nutrition 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- 230000004151 fermentation Effects 0.000 abstract description 15
- 230000009467 reduction Effects 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 6
- 241000894006 Bacteria Species 0.000 description 16
- 230000020477 pH reduction Effects 0.000 description 16
- 230000000694 effects Effects 0.000 description 11
- 239000007789 gas Substances 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000002203 pretreatment Methods 0.000 description 4
- 150000003384 small molecules Chemical class 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000000151 deposition Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000005276 aerator Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 235000019621 digestibility Nutrition 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 244000005706 microflora Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P5/00—Preparation of hydrocarbons or halogenated hydrocarbons
- C12P5/02—Preparation of hydrocarbons or halogenated hydrocarbons acyclic
- C12P5/023—Methane
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P2201/00—Pretreatment of cellulosic or lignocellulosic material for subsequent enzymatic treatment or hydrolysis
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P2203/00—Fermentation products obtained from optionally pretreated or hydrolyzed cellulosic or lignocellulosic material as the carbon source
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
Combine concurrent oxidation and aquoiysis preprocess method the invention discloses a kind of mechanical crushing for stalk anaerobic fermentation, belong to the technical field that straw anaerobic produces biogas.The present invention comprises the following steps：1）Stalk pretreatment, stalk is crushed, and particle size is 1 2cm；2）Stalk is allocated, in step 1）Addition biogas slurry and inoculum in gained stalk, obtain feed liquid, the solid content of feed liquid is 8 10%；3）Stalk is hydrolyzed, by step 2）Gained feed liquid concurrent oxidation and aquoiysis 12 days, hydrolysis temperature is 38 ± 2 DEG C, and intermittent aerating, and aeration gas-water ratio is 6:1‑20:1, obtain hydrolyzate.The problem of present invention efficiently solves stalk anaerobic fermentation crust, input and output material is difficult, improve stalk anaerobic fermentation efficiency, fermentation time reduction 10 20 days, flowed back and allocated by biogas slurry, stalk per ton can save 79 tons of allotment water, directly reduce the one-time investment 100 150 ten thousand of engineering, operating cost reduction by 10 15%.
Description
Technical field
The invention belongs to the technical field that straw anaerobic produces biogas, a kind of machinery for stalk anaerobic fermentation is particularly related to
Crush joint concurrent oxidation and aquoiysis preprocess method.
Background technology
China is large agricultural country, and crop material extremely enriches, according to statistics, and collectable stalk resource amount is about 900,000,000 tons every year；
If handling not in time, environment is not only polluted, and cause the wasting of resources.In order to realize the recycling and innoxious use of stalk,
China supports stalk scale large-sized biogas engineering construction energetically, and straw methane engineering is developed rapidly.
The content of lignin of stalk is higher, moreover, the cellulosic structure of stalk is also very complicated, intramolecule is existed largely
Crystal region, hydrogen bond and noncrystalline domain, cause dry straw to be difficult to be anaerobically digested, gas production is low, deficiency in economic performance, also,
Often occur problems in engineering operation, such as scum silica frost is serious, and input and output material is difficult, line clogging etc. is, it is necessary to often repair even
Stop production, these are to cause stalk to be not easy to by the extensive main cause for being used to produce biogas.And the method solved is exactly in straw
Stalk is pre-processed before stalk anaerobic fermentation, the internal structure of stalk is destroyed, hydrolysis rate is improved, so as to improve detesting for stalk
Oxygen digestic property, therefore, efficient pretreatment mode are to realize that stalk is used for the committed step for producing biogas on a large scale.
The pretreatment carried out by physics, chemistry and the approach such as biology to stalk, can improve straw anaerobic digestibility with
Factor of created gase, but existing above preprocess method is while improving stalk characteristic, improving raw material digestibility and increase gas production
There is also a series of problems, respectively there is its limitation.The effect of physics pretreatment and cost input are closely related, and single use is imitated
It is really limited；Chemical treatment is simple and convenient, and treatment effect is also preferable, but high to equipment requirement, adds chemical agent and adds cost,
And it is likely to cause secondary pollution；Biological Pretreatment reaction is gentle, energy consumption is smaller, and equipment is simple, will not bring environmental pollution,
But pre-processing period is long, floor space is big, it is necessary to efficient bacteria agent, and China's prior art from scale application also
There is a certain distance.In view of the design feature of stalk raw materials, engineer applied should be conceived to, a kind of low cost of exploitation, efficiently, just
Prompt, environmentally friendly preprocess method.
The content of the invention
The present invention provides a kind of mechanical crushing for stalk anaerobic fermentation and combines concurrent oxidation and aquoiysis preprocess method, solves
Straw pretreatment method of the prior art has that investment is high, effect is poor, easily cause secondary pollution and large-scale production hardly possible
Problem.
A kind of mechanical crushing for stalk anaerobic fermentation of the present invention combines concurrent oxidation and aquoiysis preprocess method, and it is mainly
Realized by the following technical programs：Comprise the following steps：1）Stalk pretreatment, stalk is crushed, and makes its particle size
For 1-2cm；2）Stalk is allocated, in step 1）Addition biogas slurry and inoculum in gained stalk, obtain feed liquid, the solid content of feed liquid is 8-
10%；3）Stalk is hydrolyzed, by step 2）Gained feed liquid concurrent oxidation and aquoiysis 1-2 days, hydrolysis temperature is 38 ± 2 DEG C, and intermittent aerating, is exposed
Gas gas-water ratio is 6:1-20:1, obtain hydrolyzate.
In the straw pretreatment method of this use mechanical crushing joint concurrent oxidation and aquoiysis of the present invention, using mechanical crushing and
The united preprocess method of concurrent oxidation and aquoiysis can make stalk be degraded to small-molecule substance to greatest extent, break single pretreatment effect
Really poor inferior position；Biogas slurry is the discharging in biogas project anaerobic fermentation tank, for the biogas slurry rich in hydrolysis acidification bacterium and methane backeria, is adopted
On the one hand allotment is carried out with biogas slurry can substitute allotment water, biogas slurry of dissolving, and on the other hand can utilize the hydrolysis acid in biogas slurry
Change bacterium, further improve pretreatment efficiency；It is the characteristic using hydrolysis acidification bacterium and methanogen using the hydrolysis method of simultaneous oxygen
Difference, improves the activity of hydrolysis acidification bacterium, hydrolysis efficiency is improved to greatest extent；The present invention can not only solve straw anaerobic hair
The problem of ferment crust, input and output material difficulty, additionally it is possible to improve stalk anaerobic fermentation efficiency, shorten fermentation time, while natural pond of having dissolved
Liquid.
It is used as a kind of preferred embodiment, the step 2）Inoculum be the step 3）Obtained hydrolyzate.This
The inoculum of invention can be carried out from inoculation without adding strain using external source using hydrolyzate, because external source adds strain in water
Need to be domesticated for dominant microflora competence exertion hydrolysis in solution preocess, startup is slower, extends the hydrolysis time of feed liquid, once
Property investment increase；In addition, external source addition strain needs extra increase financial cost, economic benefit is not good；In hydrolyzate of the present invention
The hydrolysis acidification bacterium itself contained is the most suitable strain after domestication, has for stalk and external environment and well adapts to
Property.
It is used as a kind of preferred embodiment, the step 2）Inoculum consumption be the step 3）Gained hydrolyzate
The 20-30% of cumulative volume.The present invention can not exclusively be discharged by hydrolytic tank retains 20-30% hydrolysis all the time i.e. in hydrolytic tank
Liquid is realized；In addition, can be allocated during hydrolysis operation for the first time by all with biogas slurry, extension hydrolysis time utilized biogas slurry to 2-3 days
In itself carry hydrolysis acidification bacterium self-reproduction come realize stalk hydrolysis startup.
It is used as a kind of preferred embodiment, the step 3）In, aeration gas-water ratio is 10:1-15:1.By controlling to expose
Gas-water ratio during gas can suppress the work of methane backeria preferably using hydrolysis acidification bacterium and the property difference of methanogen
Property, hydrolysis acidification bacterium is played one's part to the full, so as to improve hydrolysis acidification efficiency.
It is used as a kind of preferred embodiment, the step 3）The pH value of gained hydrolyzate is 5.0-6.0, and VFA contents are
8000-12000mg/L.This hydrolyzate of the present invention can be pumped directly into anaerobic fermentation tank and carry out anaerobic fermentation；With not hydrolyzing
Pretreated group is compared, and its aerogenesis peak can shift to an earlier date 5-8 days, and fermentation period is can be controlled in 15-25 days.
It is used as a kind of preferred embodiment, the step 3）The pH value of gained hydrolyzate is that 5.5, VFA contents are
10000mg/L.Now, feed liquid has obtained sufficient hydrolysis acidification, and VFA contents reach peak value, into anaerobic jar after can be most fast
Reach aerogenesis peak.
It is used as a kind of preferred embodiment, the step 1）In, the stalk is maize straw, wheat stalk or paddy rice
Any one or a few in stalk, is crushed, the stalk particle size after crushing is during stalk pretreatment using pulverizer
1-1.5cm.Flour pretreatment is carried out to stalk in advance, stalk can be made to be easier to make for hydrolyzing and be acidified, hydrolysis and acid is improved
Change effect, stalk is degraded to small-molecule substance to greatest extent, break the inferior position of single pretreating effect difference.
It is used as a kind of preferred embodiment, the step 1）In, during stalk pretreatment, stalk needs to carry out nature in advance
Air-dry, and use baler bundling, broken first before crushing and tie and sieve the native stone impurity being wherein mingled with.Stalk is air-dried
Facilitate the storage and transport of stalk with bundling, go the removal of impurity to improve the degree of purity of stalk, prevent from damaging pulverizer, ensure powder
Broken uniform particle sizes, are conducive to improving hydrolysis efficiency.
It is used as a kind of preferred embodiment, the step 2）In, when stalk is hydrolyzed, the time interval of aeration is 1-3h.
Intermittent aerating can be by setting aerator in the bottom of hydrolytic tank, and aerator is passed through once empty every 1-3h to feed liquid
Gas, so as to realize the simultaneous oxygen environment of hydrolyzation system.
It is used as a kind of preferred embodiment, the step 2）In, stalk is stirred when hydrolyzing, and mixing speed is 10-
30r/min.It can be sufficiently mixed stalk, biogas slurry and inoculum during hydrolysis by stirring, to improve stalk hydrolysis
Toggle speed, improves the uniformity of hydrolysis.
The beneficial effects of the invention are as follows：The present invention can be made using mechanical crushing and the united preprocess method of concurrent oxidation and aquoiysis
Stalk is degraded to small-molecule substance to greatest extent, breaks the inferior position of single pretreating effect difference；Allotment one is carried out using biogas slurry
Aspect can reduce allotment water, biogas slurry of dissolving, and on the other hand can utilize the hydrolysis acidification bacterium in biogas slurry, further improve pre-
Treatment effeciency；It is the property difference using hydrolysis acidification bacterium and methanogen using the hydrolysis method of simultaneous oxygen, improves hydrolysis acidification
The activity of bacterium, improves hydrolysis efficiency to greatest extent；Hydrolysis time was foreshortened to 1-2 days by 3-5 days before；Effectively solution of the invention
The problem of stalk anaerobic fermentation crust, input and output material difficulty of having determined, additionally it is possible to improve stalk anaerobic fermentation efficiency, shorten fermentation time
10-20 days, flowed back and allocated by biogas slurry, stalk per ton can save 7-9 tons of allotment water, the natural pond of 10000 tons of stalks is handled with year
Exemplified by gas engineering, the one-time investment 100-150 ten thousand of engineering, operating cost reduction can be directly reduced using the preprocess method
10-15%。
Embodiment
Technical scheme is clearly and completely described below in conjunction with the specific embodiment of the present invention, shown
So, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all
Belong to the scope of protection of the invention.
Embodiment one
A kind of mechanical crushing for stalk anaerobic fermentation of the present invention combines concurrent oxidation and aquoiysis preprocess method, including following step
Suddenly：
（1）Stalk is crushed, and the stalk of natural air drying is used in baler bundling, the stalk stockyard for typically depositing in biogas engineering；
Bundle is broken before crushing first and the impurity such as the native stone that is wherein mingled with are sieved, being then crushed to particle size using stalk crasher is
1cm。
（2）Stalk is allocated, and the stalk after crushing is delivered in hydrolysis preparing pool using belt material-feeding machine, uses anaerobic fermentation
Biogas slurry afterwards is allocated, and is mixed together uniformly with inoculum by mixer stirring, is obtained feed liquid, the solid content for making feed liquid is
8%。
（3）Stalk is hydrolyzed, and deployed stalk concurrent oxidation and aquoiysis 1 day in hydrolytic tank, feed liquid passes through heating dish in hydrolytic tank
Pipe is heated, and it is 36 DEG C to maintain temperature, and hydrolytic process is stirred by mixer, and mixing speed is 10r/min, and passes through hydrolytic tank
The aeration tube of bottom carries out intermittent aerating, and aeration gas-water ratio is 6:1, the time interval of aeration is 1h, obtains hydrolyzate.
The hydrolyzate that method according to the present invention is obtained, by detection, its pH is 5.5, VFA（Volatile fatty acid）Content
For 10000mg/L；The hydrolyzate is pumped directly into anaerobic fermentation tank and carries out anaerobic fermentation, result of the test shows, with not entering water-filling
The blank control group of solution pretreatment is compared, and the aerogenesis peak of hydrolyzate of the invention shifts to an earlier date 5 days, and fermentation period is 15 days, fermentation
Time shortens 18 days.
Embodiment two
A kind of mechanical crushing for stalk anaerobic fermentation of the present invention combines concurrent oxidation and aquoiysis preprocess method, including following step
Suddenly：
（1）Stalk is crushed, and the stalk of natural air drying is used in baler bundling, the stalk stockyard for typically depositing in biogas engineering；
Bundle is broken before crushing first and the impurity such as the native stone that is wherein mingled with are sieved, being then crushed to particle size using stalk crasher is
2cm。
（2）Stalk is allocated, and the stalk after crushing is delivered in hydrolysis preparing pool using belt material-feeding machine, uses anaerobic fermentation
Biogas slurry afterwards is allocated, and is mixed together uniformly with inoculum by mixer stirring, is obtained feed liquid, the solid content for making feed liquid is
10%；Inoculum is step in embodiment one（3）Obtained hydrolyzate, inoculum concentration is the 1/4 of whole hydrolysis pool volume；Generally may be used
Be complete the 1st time hydrolysis pretreatment after, hydrolyzate discharge when in hydrolytic tank retain 1/4 hydrolyzate be used as next stalk
The inoculum of allotment；2 hydrolytic tanks can be set generally in straw methane engineering, be used alternatingly, can so be ensured daily all
There can be the feed liquid hydrolyzed to be used for anaerobic fermentation.
（3）Stalk is hydrolyzed, and deployed stalk concurrent oxidation and aquoiysis 2 days in hydrolytic tank, feed liquid passes through heating dish in hydrolytic tank
Pipe is heated, and it is 40 DEG C to maintain temperature, and hydrolytic process is stirred by mixer, and mixing speed is 22r/min, and passes through hydrolytic tank
The aeration tube of bottom carries out intermittent aerating, and aeration gas-water ratio is 10:1, the time interval of aeration is 2h, obtains hydrolyzate.
The hydrolyzate that method according to the present invention is obtained, by detection, its pH is that 5.0, VFA contents are 12000mg/L；Will
The hydrolyzate is pumped directly into anaerobic fermentation tank and carries out anaerobic fermentation, and result of the test shows, the blank with pretreatment is not hydrolyzed
Control group is compared, and the aerogenesis peak of hydrolyzate of the invention shifts to an earlier date 8 days, and fermentation period is 25 days, fermentation time reduction 20 days.
Embodiment three
A kind of mechanical crushing for stalk anaerobic fermentation of the present invention combines concurrent oxidation and aquoiysis preprocess method, including following step
Suddenly：
（1）Stalk is crushed, and the stalk of natural air drying is used in baler bundling, the stalk stockyard for typically depositing in biogas engineering；
Bundle is broken before crushing first and the impurity such as the native stone that is wherein mingled with are sieved, being then crushed to particle size using stalk crasher is
1.5cm。
（2）Stalk is allocated, and the stalk after crushing is delivered in hydrolysis preparing pool using belt material-feeding machine, uses anaerobic fermentation
Biogas slurry afterwards is allocated, and is mixed together uniformly with inoculum by mixer stirring, is obtained feed liquid, the solid content for making feed liquid is
9%；Inoculum is the hydrolyzate obtained after the 1st hydrolysis pretreatment is completed, is retained when hydrolyzate discharges in hydrolytic tank
The inoculum that 20% hydrolyzate is allocated as next stalk.
（3）Stalk is hydrolyzed, deployed stalk concurrent oxidation and aquoiysis 1.5 days in hydrolytic tank, and feed liquid, which passes through in hydrolytic tank, to be heated
Coil pipe is heated, and it is 38 DEG C to maintain temperature, and hydrolytic process is stirred by mixer, and mixing speed is 30r/min, and passes through hydrolytic tank
Bottom aeration tube carry out intermittent aerating, aeration gas-water ratio be 20:1, the time interval of aeration is 3h, obtains hydrolyzate.
The hydrolyzate that method according to the present invention is obtained, by detection, its pH is that 6.0, VFA contents are 8000mg/L；Will
The hydrolyzate is pumped directly into anaerobic fermentation tank and carries out anaerobic fermentation, and result of the test shows, the blank with pretreatment is not hydrolyzed
Control group is compared, and the aerogenesis peak of hydrolyzate of the invention shifts to an earlier date 7 days, and fermentation period is 20 days, fermentation time reduction 15 days.
Example IV
A kind of mechanical crushing for stalk anaerobic fermentation of the present invention combines concurrent oxidation and aquoiysis preprocess method, including following step
Suddenly：1）Stalk pretreatment, stalk is crushed, and it is 1cm to make its particle size；2）Stalk is allocated, and biogas slurry is added in above-mentioned stalk
And inoculum, feed liquid is obtained, the solid content of feed liquid is 8%；3）Stalk is hydrolyzed, and by above-mentioned feed liquid concurrent oxidation and aquoiysis 1 day, hydrolysis temperature was
38 DEG C, and intermittent aerating, aeration gas-water ratio is 15:1, obtain hydrolyzate.
The hydrolyzate that method according to the present invention is obtained, by detection, its pH is that 5.6, VFA contents are 9000mg/L；Will
The hydrolyzate is pumped directly into anaerobic fermentation tank and carries out anaerobic fermentation, and result of the test shows, the blank with pretreatment is not hydrolyzed
Control group is compared, and the aerogenesis peak of hydrolyzate of the invention shifts to an earlier date 6 days, and fermentation period is 18 days, fermentation time reduction 12 days.
Embodiment five
A kind of mechanical crushing for stalk anaerobic fermentation of the present invention combines concurrent oxidation and aquoiysis preprocess method, including following step
Suddenly：1）Stalk pretreatment, stalk is crushed, and it is 2cm to make its particle size；2）Stalk is allocated, and biogas slurry is added in above-mentioned stalk
And inoculum, feed liquid is obtained, the solid content of feed liquid is 10%, and inoculum is the hydrolyzate rich in hydrolysis acidification bacterium, and inoculum is complete
Obtained hydrolyzate after into the 1st hydrolysis pretreatment, when hydrolyzate discharge in hydrolytic tank the hydrolyzate of reservation 30% under
The inoculum of secondary stalk allotment；3）Stalk was hydrolyzed, by above-mentioned feed liquid concurrent oxidation and aquoiysis 2 days, and hydrolysis temperature is 38 DEG C, and interval exposes
Gas, aeration gas-water ratio is 15:1, the time interval of aeration is 2h, obtains hydrolyzate.
The hydrolyzate that method according to the present invention is obtained, by detection, its pH is that 5.8, VFA contents are 11000mg/L；Will
The hydrolyzate is pumped directly into anaerobic fermentation tank and carries out anaerobic fermentation, and result of the test shows, the blank with pretreatment is not hydrolyzed
Control group is compared, and the aerogenesis peak of hydrolyzate of the invention shifts to an earlier date 7 days, and fermentation period is 23 days, fermentation time reduction 10 days.
The beneficial effects of the invention are as follows：The present invention can be made using mechanical crushing and the united preprocess method of concurrent oxidation and aquoiysis
Stalk is degraded to small-molecule substance to greatest extent, breaks the inferior position of single pretreating effect difference；Allotment one is carried out using biogas slurry
Aspect can reduce allotment water, biogas slurry of dissolving, and on the other hand can utilize the hydrolysis acidification bacterium in biogas slurry, further improve pre-
Treatment effeciency；It is the property difference using hydrolysis acidification bacterium and methanogen using the hydrolysis method of simultaneous oxygen, improves hydrolysis acidification
The activity of bacterium, improves hydrolysis efficiency to greatest extent；Hydrolysis time was foreshortened to 1-2 days by 3-5 days before；Effectively solution of the invention
The problem of stalk anaerobic fermentation crust, input and output material difficulty of having determined, additionally it is possible to improve stalk anaerobic fermentation efficiency, shorten fermentation time
10-20 days, flowed back and allocated by biogas slurry, stalk per ton can save 7-9 tons of allotment water, the natural pond of 10000 tons of stalks is handled with year
Exemplified by gas engineering, the one-time investment 100-150 ten thousand of engineering, operating cost reduction can be directly reduced using the preprocess method
10-15%。
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (10)
1. a kind of mechanical crushing for stalk anaerobic fermentation combines concurrent oxidation and aquoiysis preprocess method, it is characterised in that including with
Lower step：
1）Stalk pretreatment, stalk is crushed, and it is 1-2cm to make its particle size；
2）Stalk is allocated, in step 1）Addition biogas slurry and inoculum in gained stalk, obtain feed liquid, the solid content of feed liquid is 8-10%；
3）Stalk is hydrolyzed, by step 2）Gained feed liquid concurrent oxidation and aquoiysis 1-2 days, hydrolysis temperature is 38 ± 2 DEG C, and intermittent aerating, is exposed
Gas gas-water ratio is 6:1-20:1, obtain hydrolyzate.
2. the mechanical crushing according to claim 1 for stalk anaerobic fermentation combines concurrent oxidation and aquoiysis preprocess method, its
It is characterised by：
The step 2）Inoculum be the step 3）Obtained hydrolyzate.
3. the mechanical crushing according to claim 2 for stalk anaerobic fermentation combines concurrent oxidation and aquoiysis preprocess method, its
It is characterised by：
The step 2）Inoculum consumption be the step 3）The 20-30% of gained hydrolyzate cumulative volume.
4. the mechanical crushing according to claim 1 for stalk anaerobic fermentation combines concurrent oxidation and aquoiysis preprocess method, its
It is characterised by：
The step 3）In, aeration gas-water ratio is 10:1-15:1.
5. the mechanical crushing joint concurrent oxidation and aquoiysis for stalk anaerobic fermentation according to claim 1-4 any one are located in advance
Reason method, it is characterised in that：
The step 3）The pH of gained hydrolyzate is 5.0-6.0, and VFA contents are 8000-12000mg/L.
6. the mechanical crushing according to claim 5 for stalk anaerobic fermentation combines concurrent oxidation and aquoiysis preprocess method, its
It is characterised by：
The step 3）The pH of gained hydrolyzate is that 5.5, VFA contents are 10000mg/L.
7. the mechanical crushing according to claim 1 for stalk anaerobic fermentation combines concurrent oxidation and aquoiysis preprocess method, its
It is characterised by：
The step 1）In, the stalk is any one or a few in maize straw, wheat stalk or rice straw, stalk
Crushed during pretreatment using pulverizer, the stalk particle size after crushing is 1-1.5cm.
8. the mechanical crushing according to claim 7 for stalk anaerobic fermentation combines concurrent oxidation and aquoiysis preprocess method, its
It is characterised by：
The step 1）In, during stalk pretreatment, stalk needs to carry out natural air drying in advance, and uses baler bundling, crushes
The native stone impurity being wherein mingled with is tied and sieved to preceding break first.
9. the mechanical crushing according to claim 1 for stalk anaerobic fermentation combines concurrent oxidation and aquoiysis preprocess method, its
It is characterised by：
The step 2）In, when stalk is hydrolyzed, the time interval of aeration is 1-3h.
10. the mechanical crushing according to claim 1 for stalk anaerobic fermentation combines concurrent oxidation and aquoiysis preprocess method, its
It is characterised by：
The step 2）In, stalk is stirred when hydrolyzing, and mixing speed is 10-30r/min.
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| CN109971794A (en) * | 2019-03-15 | 2019-07-05 | 青岛汇君环境能源工程有限公司 | A kind of efficient stalk hydrolysis acidification technique |
| CN111044415A (en) * | 2019-12-02 | 2020-04-21 | 同济大学 | Method for evaluating accessibility of straw anaerobic transformation organisms based on fractal dimension |
| CN111748587A (en) * | 2020-07-28 | 2020-10-09 | 东北农业大学 | A method for ultrasonic cell crushing combined with aerobic hydrolysis to treat straw |
| CN116769568A (en) * | 2023-06-05 | 2023-09-19 | 中国华电科工集团有限公司 | Straw treatment system and method |
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| CN105132469A (en) * | 2015-09-09 | 2015-12-09 | 北京盈和瑞环保工程有限公司 | Method for using lignocellulose to produce biogas |
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| US20140353163A1 (en) * | 2009-04-17 | 2014-12-04 | Ion Research, Inc. | Biological/Electrolytic Conversion of Biomass to Hydrocarbons |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109971794A (en) * | 2019-03-15 | 2019-07-05 | 青岛汇君环境能源工程有限公司 | A kind of efficient stalk hydrolysis acidification technique |
| CN111044415A (en) * | 2019-12-02 | 2020-04-21 | 同济大学 | Method for evaluating accessibility of straw anaerobic transformation organisms based on fractal dimension |
| US11156539B2 (en) | 2019-12-02 | 2021-10-26 | Tongji University | Method for evaluating bioavailability of organic solid waste by anaerobic conversion based on fractal dimension |
| CN111748587A (en) * | 2020-07-28 | 2020-10-09 | 东北农业大学 | A method for ultrasonic cell crushing combined with aerobic hydrolysis to treat straw |
| CN116769568A (en) * | 2023-06-05 | 2023-09-19 | 中国华电科工集团有限公司 | Straw treatment system and method |
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