CN102399825B - Method for fermenting ammonia pre-treated wheat stalks to produce methane - Google Patents
Method for fermenting ammonia pre-treated wheat stalks to produce methane Download PDFInfo
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- CN102399825B CN102399825B CN2011103440866A CN201110344086A CN102399825B CN 102399825 B CN102399825 B CN 102399825B CN 2011103440866 A CN2011103440866 A CN 2011103440866A CN 201110344086 A CN201110344086 A CN 201110344086A CN 102399825 B CN102399825 B CN 102399825B
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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
Abstract
The invention discloses a method for fermenting ammonia pre-treated wheat stalks to produce methane in the technical field of agricultural production. The methane is prepared by pre-treating wheat stalks and carrying out complete mixed anaerobic fermentation on the pre-treated wheat stalks. According to the invention, the methane is high efficiently and stably prepared by using the wheat stalks. The method for fermenting ammonia pre-treated wheat stalks to produce methane, disclosed by the invention, has the characteristics of high raw material utilization rate, stability in gas production, large gas producing quantity and uneasiness for scum crusting in the fermenting process; and recycling, energy and harmlessness of the wheat stalks are realized.
Description
Technical field
What the present invention relates to is a kind of method of field of agricultural production technologies, specifically is the method that a kind of ammonia pre-treatment wheat stalk is produced biogas.
Background technology
The north of China is the major area of plantation wheat, and annual meeting produces a large amount of wheat stalks in the plantation wheat, and most wheat stalk is arbitrarily abandoned or directly burns, and causes great environmental pollution, has also caused the waste of resource.How to solve the rural area and arbitrarily abandon, burn environmental problem, the raising efficiency of resource that wheat stalk brings, become an important topic of new countryside construction.Utilize wheat stalk to produce biogas, not only can solve northern country methane-generating pit lack of material problem, can also reduce wheat stalk from root and burn the environmental problem of bringing, resource is effectively utilized; In addition, killed the germ worm's ovum that carries on the wheat stalk by biogas anaerobic fermentation, the crop pest problem of having avoided the wheat stalk direct returning to farmland to cause.In addition, contain rich in amino acid in the slag of liquid natural pond, natural pond, nitrogen, phosphorus, potassium and trace element are good feed and fodder additivess, also can be used as the high-quality fertilizer.The effect that has the disinsection prophylaxis evil in natural pond liquid and the natural pond slag relevant report formerly.
By the end of so far, the method for handling at rural area residue wheat stalk has a lot.Such as utilize stalk to culture fungies such as mushroom, and stalk is handled to serve as livestock and poultry feed, also have by some chemistry routes and handle the back in order to other purposes.But these approach fundamentally can not solve the residue problem of wheat stalk, and utilize the wheat stalk fermentation methane production, and biomass resource is transformed, and directly being utilized by the peasant is practical way.But utilizing stalk to produce biogas still has many technical barriers not solve, and can't popularize in an all-round way up to the present.Because contain a large amount of Mierocrystalline celluloses, hemicellulose, xylogen etc. in the stalk, three kinds of materials become crystalline configuration in stalk, be difficult to be degraded, the main component Mierocrystalline cellulose is hard-packed xln, and Mierocrystalline cellulose and hemicellulose are wrapped up by xylogen.If directly come fermentation methane production with stalk, can occur then that fermentation starting is slow, fermentation time is long, factor of created gase is low, the straw utilization rate is low, easily problem such as ligation crust.And the pretreated main effect of stalk is opened Mierocrystalline cellulose, hemicellulose and lignin separation, but increases microorganism and cellulosic contact area in the mud, thereby improves the efficient of fermentation.With fermentation again after the stalk pre-treatment, then can improve factor of created gase, shorten start time; Simultaneously, it is big that pretreated material density becomes, and sinks to very soon at the bottom of the fermentation vat after the raw material charging, is conducive to that organism of fermentation fully contacts with raw material in the fermenting process, the scum silica frost problem that crusts when also having solved biogas fermentation.
Publication number is the Chinese invention patent of 102154374A, name is called sour pretreated water rice straw and produces the method for biogas (application number: 201010618326.2 applyings date: 2010-12-30), the method that this patent provides a kind of sour pretreated water rice straw of field of agricultural production technologies to produce biogas is by carrying out complete hybrid anaerobically fermenting to produce biogas with rice straw after sour pre-treatment.But the stalk after acidified is applied in the process of anaerobically fermenting, is easy to generate inhibitions such as furfural, suppresses the carrying out of anaerobically fermenting.In addition, sour pretreated cost is too high, and the anaerobically fermenting excessive cycle is not suitable for the utilization of actual engineering.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method of ammonia pre-treatment wheat stalk fermentation methane production, has solved the problem of inefficiency in the wheat stalk fermentation, has reduced cost.
The present invention realizes that by following technical scheme the present invention is by producing biogas with carrying out complete hybrid anaerobically fermenting after the wheat stalk ammonia treatment.
Described wheat stalk refers to: through clean and be cut into the wheat stalk of the long segment of 2-3cm after drying naturally.
Described ammonia pre-treatment refers to: adopting concentration is the urea soln of 30g/L-50g/L, and be 50g according to the volume ratio of the quality of wheat stalk and urea soln: 200ml mixes, and seals under the temperature that places 30 ℃ and handle.
It is 25 days that described sealing places 30 ℃ following treatment time of temperature.
Described complete hybrid anaerobically fermenting refers to: ammonia treatment wheat stalk is later placed adopt ferment jar back to regulate carbon-nitrogen ratio be 20: 1～30: 1, after adding 30% the inoculum adopt total fermented liquid quality in the ferment jar, regulate initial pH value to 7.0, place the water bath with thermostatic control anaerobically fermenting at last.
Described adjusting carbon-nitrogen ratio refers to: adopt bicarbonate of ammonia to regulate.
Described adjusting initial pH value to 7.0 refers to: the HCL with 5mol/L regulates initial pH value to 7.0.
Described water bath with thermostatic control refers to: constant temperature stirs under 38 ℃ of environment, and stirring velocity is 100 rev/mins.
The described anaerobically fermenting time is 25 days.
Described inoculum is active sludge, takes from the fermentation resistates of the bionethanation system of normal fermentation.
The present invention has improved wheat straw resourceization, energy and innoxious efficient, the wheat stalk that composing environment is polluted changes into the considerable clean energy of a kind of high-quality, the processing wheat stalk is simple to operate, and expense is cheap, the mild condition that needs, with directly utilize wheat stalk to carry out biogas fermentation to compare, total gas production, daily output tolerance and utilization ratio of raw materials have been improved, aerogenesis is more stable, and avoid occurring scum silica frost crust phenomenon at fermenting process, solved the problem of inefficiency in the wheat stalk fermentation.Compare with the technology of background technology, fermentation starting time and fermentation period shorten dramatically, by verification experimental verification draw adopt ammonia treatment wheat stalk in the system that carries out anaerobically fermenting, pH maintains between 7～8 all the time, and the acidifying of fermented liquid is had good regulating effect.
Embodiment
Below embodiments of the invention are elaborated, present embodiment is that prerequisite is implemented with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
The fermentation unit that adopts in the present embodiment partly is made up of fermentation flask, air collector, receiving flask, water bath with thermostatic control vibrator etc., its fermentation flask is the triangular flask of 1000mL, seal beyond the Great Wall with sizeable silica gel plug on the bottle, bore two skies at silica gel plug, one connects two sizeable Glass tubings respectively, one is connected with the conduit of air collector, and another root is as stopple coupon.Air collector is the triangular flask of 1000mL, fill saturated aqueous common salt in the bottle, seal beyond the Great Wall with sizeable silica gel plug on the bottle, bore two skies at silica gel plug, one connects two sizeable Glass tubings respectively, one is long and the other is short, long stretch into that liquid level is following to link to each other with the receiving flask of back, short tube links to each other with the fermentation flask of front, and receiving flask is 1000mL simple glass bottle, pipe connecting is all used the silicone tube of Φ 8mm, and seals with Vaseline.After producing biogas in the fermentation flask, gas enters in the air collector by conduit, because air pressure is bigger than air collector, so the liquid extrusion is entered receiving flask, by the volume of liquid in the measurement collection bottle, just obtains the volume of aerogenesis.
The concrete implementation step of present embodiment is as follows:
(1) raw material is cleaned, and dried under field conditions (factors), be cut into the segment of 2～3cm;
(2) the raw material 50g that gets step (1) gained joins in the plastic tank, and adding concentration is 30g/L, 35g/L, and 40g/L, 45g/L, the urea soln of 50g/L, wherein the volume ratio of the quality of wheat stalk and urea soln is 50g: 200ml.Control group (add 200ml distilled water do not add urea soln) is set simultaneously, spreads preservative film at plastic tank then, cover lid is positioned under 30 ℃ the temperature and handled 25 days;
(3) record the TS of step (2) gained raw material, the quality that adds stalk is set, and to make the TS of stalk be 48g, put in the fermentation unit, the distilled water that adds inoculum 240g and respective quality, wherein the amount of inoculum accounts for 30% of total fermented liquid quality, the fermented feed liquid mass concentration is 6%, and wherein the quality of total fermented liquid is 800g; Inoculum is active sludge in the present embodiment, and taking from Chongming Island Village Vanguard, Shanghai City is the fermentation resistates of the bionethanation system of the normal fermentation of fermentation raw material with the pig manure, and its total solids level massfraction is 10.47%, and the water ratio massfraction is 89.53%.
(4) carbon-nitrogen ratio of raw material was respectively 20: 1 in the regulating step (3), and 25: 1,30: 1;
(5) use the HCL of 5mol/L to regulate initial pH value to 7.0 to the raw material of step (4);
(6) sealing and fermenting device, and be placed in the water bath with thermostatic control anaerobically fermenting 25 days, temperature is controlled at 38 ℃, and fermentation unit is connected with water-freeing arrangement, and carries out continuously stirring, and stirring velocity is 100 rev/mins;
(7) adopt drainage to survey the volume of biogas, and every day with graduated cylinder measurement gas volume, got once the content that the gas sample detects its methane in per 5 days.
Above-described embodiment effect is: be in 30 days in total aerogenesis time, ammonia treatment concentration is 30g/L, 35g/L, 40g/L, 45g/L, five groups of fermentation gas cumulative volumes of 50g/L are respectively 9121ml, 8043ml, 7045ml, 8097ml, 8359ml, the control group volume of gas is 6003ml, wherein the treatment group of 30g/L is for the highest, and it on average produces tolerance daily is 304mL, and high methane content is 53%.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (6)
1. the method for an ammonia pre-treatment wheat stalk fermentation methane production is characterized in that, by wheat stalk is carried out complete hybrid anaerobically fermenting to produce biogas after the ammonia pre-treatment;
Described ammonia pre-treatment refers to: adopting concentration is the urea soln of 30g/L-50g/L, is that 50g:200ml mixes according to quality and the volume ratio of urea soln of wheat stalk, and seals under the temperature that places 30 ℃ processing 25 days;
Described complete hybrid anaerobically fermenting refers to: the wheat stalk after ammonia is pretreated places and adopts ferment jar back adjusting carbon-nitrogen ratio is 20:1～30:1, after adding 30% the inoculum adopt total fermented liquid quality in the ferment jar, regulate initial pH value to 7.0, placed 38 ℃ of water bath with thermostatic control anaerobically fermentings at last 25 days.
2. the method for ammonia pre-treatment wheat stalk fermentation methane production according to claim 1 is characterized in that described wheat stalk refers to: through clean and be cut into the wheat stalk of the long segment of 2-3cm after drying naturally.
3. the method for ammonia pre-treatment wheat stalk fermentation methane production according to claim 1 is characterized in that, described adjusting carbon-nitrogen ratio refers to: adopt bicarbonate of ammonia to regulate.
4. the method for ammonia pre-treatment wheat stalk fermentation methane production according to claim 1 is characterized in that, described adjusting initial pH value to 7.0 refers to: the HCL with 5mol/L regulates initial pH value to 7.0.
5. the method for ammonia pre-treatment wheat stalk fermentation methane production according to claim 1 is characterized in that described water bath with thermostatic control refers to: constant temperature stirs under 38 ℃ of environment, and stirring velocity is 100 rev/mins.
6. the method for ammonia pre-treatment wheat stalk fermentation methane production according to claim 1 is characterized in that described inoculum is active sludge, takes from the fermentation resistates of the bionethanation system of normal fermentation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103440866A CN102399825B (en) | 2011-11-03 | 2011-11-03 | Method for fermenting ammonia pre-treated wheat stalks to produce methane |
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| CN2011103440866A CN102399825B (en) | 2011-11-03 | 2011-11-03 | Method for fermenting ammonia pre-treated wheat stalks to produce methane |
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| CN102399825A CN102399825A (en) | 2012-04-04 |
| CN102399825B true CN102399825B (en) | 2013-09-25 |
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| CN106434762A (en) * | 2016-09-27 | 2017-02-22 | 青岛海之源智能技术有限公司 | Method for producing marsh gas by using wheat straw |
| CN106701838A (en) * | 2017-01-06 | 2017-05-24 | 安徽省农业科学院畜牧兽医研究所 | Alfalfa anaerobic fermentation production process |
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| CN102154374B (en) * | 2010-12-30 | 2014-04-16 | 上海交通大学 | Method for preparing marsh gas by pretreating rice straws with acid |
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