CN1814762A - Method for improving rice straw anaerobic digestion methane yield by sodium hydroxide solid-state normal-temperature treatment - Google Patents
Method for improving rice straw anaerobic digestion methane yield by sodium hydroxide solid-state normal-temperature treatment Download PDFInfo
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- CN1814762A CN1814762A CNA2005101260793A CN200510126079A CN1814762A CN 1814762 A CN1814762 A CN 1814762A CN A2005101260793 A CNA2005101260793 A CN A2005101260793A CN 200510126079 A CN200510126079 A CN 200510126079A CN 1814762 A CN1814762 A CN 1814762A
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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
This invention discloses a method for processing straws under normal temperature by NaOH and increasing yields of marsh gas by the straw anaerobic digestion including: 1, chemical pre-process: fully mixing the NaOH solution in a certain concentration to a humid state, then putting them in a container to be sealed and preserved and outputting them, 2, generating marsh gas by anaerobic digestion: putting the pre-processed straws into the device and inoculating sludge to be added with suitable water, regulating the carbon nitrogen ratio of the entire digestive system and temperature, regulating the pH value of the digestive solution and disacharging the residues, which can increase yields of marsh gas and reduce the production period.
Description
Technical field
The present invention relates to a kind of straw that utilizes and carry out the method that anaerobic digestion produces biogas, relate in particular to a kind of sodium hydroxide solid-state normal-temperature and handle the method that improves rice straw anaerobic digestion methane yield.
Background technology
China is maximum in the world agricultural country, and all kinds of agricultural crop straw total amounts of annual generation reach 700,000,000 tons.Use energy and the paper making raw material as feed, fertilizer, life in the countryside except part, a large amount of stalks are caused serious atmospheric pollution and fire by open incineration, influence the safety of communications and transportation, have also wasted a large amount of resources simultaneously.
By anaerobic digestion techniques stalk being converted into clean energy---biogas is an effective way that solves the agricultural wastes environmental pollution and realize recycling.
Be different from general anaerobic digestion raw material such as human and animal excreta, mud etc., the wood fibre cellulose content of straw is higher, and anaerobion to the degradation capability of lignocellulose a little less than, cause that conventional anaerobic digestion process is slow, digestive efficiency is low, gas production rate is few, input-output efficiency difference etc., thereby limited the large-scale application that straw is used for biogas production.
By straw is carried out pre-treatment, can improve its anaerobic digestion performance.Present pretreatment process has physics, biochemistry and chemical process, and its purpose all is to wish to change the physical structure of straw or it is degraded into simple composition by pre-treatment, is beneficial to the digestibility and utilization of anerobe subsequently, thereby improves biogas output.Physical method is simple relatively, but treatment effect is limited; The biological method effect is comparatively obvious, but the cultivation of microorganism to the requirement of equipment and technology mostly than higher, laboratory study is easy, the practical application difficulty is very big; Liquid chemical pre-treatment aerogenesis effect is better, but DESIGN OF REACTOR is had relatively high expectations, and the reuse of reaction solution and disposal also cause the raising of whole technology cost.
Summary of the invention
In order to solve the problem of above-mentioned existence, the invention provides a kind of small amounts of sodium hydroxide of passing through, under solid conditions, straw is carried out the normal temperature Chemical Pretreatment, to reach obvious raising rice straw anaerobic digestion methane yield, the shortening aerogenesis cycle, sodium hydroxide solid-state normal-temperature is handled the method that improves rice straw anaerobic digestion methane yield.
Technical scheme of the present invention is achieved in that a kind of sodium hydroxide solid-state normal-temperature processing improves the method for rice straw anaerobic digestion methane yield, comprise (1) Chemical Pretreatment: the straw thorough mixing of certain density sodium hydroxide solution and pulverizing is even, mixing the back is dampness, be put in sealing preservation in the container then, last discharging; (2) anaerobic digestion produces biogas: add in anaerobic digestion device through pretreated straw and seed sludge, and add water to suitable concn, wherein suitable concn is to make the wet basis water ratio of anaerobic digestion solution be not less than 93%, regulate the carbon-nitrogen ratio of whole Digestive tract, the control anaerobic digestion temperature, adjust the pH value of Digestive system, draw off the natural pond slag at last.
The addition of wherein said sodium hydroxide is 6%～8% times of dry weight to straw.The sealing shelf time is 30 days in container.During preservation, by the alkaline effect, destroy the structure of lignocellulose in the straw and change its chemical ingredients, alkali concn is low excessively, acts on not obvious; Excessive concentration, dry-matter loss is big, the cost height, and discharging is strong basicity, and unfavorable to follow-up anaerobic digestion.
The inoculum that wherein said anaerobic digestion produces in the biogas process is the anaerobically digested sludge of sewage work.The addition of mud is MLSS=15g/L (straw is disregarded interior) for the suspended sediment concentration of the whole anaerobic digester system in reinforced back, and MLSS represents mixed liquor suspended solid, MLSS concentration (Mixed Liquid Suspended Solid).
It is 50～65g dry rice straw/L that wherein said anaerobic digestion produces the addition that adds straw in the biogas process in anaerobic digestion device.Feeding quantity is low excessively, and digestive process carries out soon, but can not make full use of the processing power of anaerobic digestion bacterium, and the aerogenesis total amount is not high; Feeding quantity is too high, and then the content of anaerobic digestion bacterium is low excessively with respect to the content of straw in the mud, and digestive process slowly and is easily stagnated because of acid accumulation.
Anaerobic digestion temperature is 34～37 ℃ of middle temperature, and optimum is 35 ℃, and the pH value of Digestive system remains on 6.5～8.5.
The carbon-nitrogen ratio to 20 of adjusting total system when reinforced～35: 1, optimum is 25: 1.
Whole anaerobic digestion process needs 45～50 days.
Wherein said anaerobic digestion produces the reactor that the anaerobic digestion device that uses in the biogas process is isolated outside air, band stirring and thermostat, and the top of reactor is provided with opening for feed and methane outlet, and the bottom is provided with agitator and the outlet of natural pond slag.
The natural pond slag of retaining after anaerobic digestion is rich in multiple elements such as organic matter and nitrogen, phosphorus, potassium, is the fertilizer of crop growth, also can be used as the feed of aquaculture.
Compared with prior art, the invention has the beneficial effects as follows:
1, with respect to the liquid chemical pre-treatment, the Chemical Pretreatment under the solid conditions has not only been exempted the energy consumption of treatment solution cleansing and recycling, and has simplified treatment facility greatly, saves cost, is more suitable for large-scale production.
2, with respect to not passing through pretreated straw, reaching the required reaction times of identical cumulative gas shortens more than 40%, thereby can significantly improve the production efficiency of anaerobic digestion reaction vessel.
3, with respect to not passing through pretreated straw, the average gas production rate of whole anaerobic digestion reaction time improves 50%～100%, and the average content of effective constituent methane improves 5%～10% in the biogas.
Embodiment
Below in conjunction with specific embodiment the present invention is described in further detail.
Embodiment one:
With straw chopping is 20 purpose particles, and 8% times of sodium hydroxide to the straw dry weight is dissolved in 0.8 times in the water of straw dry weight, again with chopping after the straw uniform mixing, be put in then in the container, sealing is at normal temperatures preserved and was got final product discharging in 30 days.
Measure the MLSS of seed sludge, press the inoculum size (straw is disregarded the contribution of MLSS) of the criterion calculation mud of reinforced back MLSS=15g/L.
The carbon-nitrogen ratio of farm crop straw is near 75, and the carbon-nitrogen ratio of seed sludge is near 6.25, and by the amount that this data computation need be added ammonium chloride, the carbon-nitrogen ratio when beginning with adjusting anaerobic digestion operation was at 25: 1.
The amount of pressing straw dry weight (down together) 50g/L is reinforced, mixes and add water to suitable concn with mud, and wherein suitable concn is to make the wet basis water ratio of anaerobic digestion solution be not less than 93%.Guarantee the anaerobic digestion reaction vessel temperature of reaction at 35 ℃, pH value 6～8 guarantees fully to stir.
Begin from anaerobic digestion the 3rd～five day can a large amount of biogas of output, and after the 50th day, gas production rate obviously reduces, and shows that anaerobic digestion process finishes substantially, and open reactor and discharge the natural pond slag this moment, does the charging of next batch anaerobic digestion.
Entire reaction period biogas produces total amount and reaches 30L (50g straw), the average content of methane reaches 65% in the biogas, and the straw of not handling through present technique, its biogas produces total amount and has only 15L (50g straw), and the average content of methane is not higher than 55% in the biogas.
Claims (10)
1, sodium hydroxide solid-state normal-temperature is handled the method that improves rice straw anaerobic digestion methane yield, it is characterized in that: comprise (1) Chemical Pretreatment: the straw thorough mixing of certain density sodium hydroxide solution and pulverizing is even, mixing the back is dampness, be put in sealing preservation in the container then, last discharging; (2) anaerobic digestion produces biogas: add in anaerobic digestion device through pretreated straw and seed sludge, and add water to suitable concn, regulate the carbon-nitrogen ratio of whole Digestive tract, regulate anaerobic digestion temperature, adjust the pH value of Digestive system, draw off the natural pond slag at last.
2, sodium hydroxide solid-state normal-temperature according to claim 1 is handled the method that improves rice straw anaerobic digestion methane yield, and the addition that it is characterized in that described sodium hydroxide is 6%～8% times of dry weight to straw.
3, sodium hydroxide solid-state normal-temperature according to claim 1 is handled the method that improves rice straw anaerobic digestion methane yield, it is characterized in that the described Chemical Pretreatment stage seals the shelf time in container be 30 days.
4, sodium hydroxide solid-state normal-temperature according to claim 1 is handled the method that improves rice straw anaerobic digestion methane yield, it is characterized in that the inoculum that described anaerobic digestion produces in the biogas process is the anaerobically digested sludge of sewage work.
5, sodium hydroxide solid-state normal-temperature according to claim 1 is handled the method that improves rice straw anaerobic digestion methane yield, and the addition that it is characterized in that described mud is that the mixed liquor suspended solid, MLSS concentration of the whole anaerobic digester system in reinforced back is MLSS=15g/L.
6, sodium hydroxide solid-state normal-temperature according to claim 1 is handled the method that improves rice straw anaerobic digestion methane yield, it is characterized in that it is 50～65g dry rice straw/L that described anaerobic digestion produces the addition that adds straw in the biogas process in anaerobic digestion device.
7, sodium hydroxide solid-state normal-temperature according to claim 1 is handled the method that improves rice straw anaerobic digestion methane yield, it is characterized in that described anaerobic digestion temperature is 34～37 ℃, and the pH value of Digestive system remains on 6.5～8.5.
8, sodium hydroxide solid-state normal-temperature according to claim 7 is handled the method that improves rice straw anaerobic digestion methane yield, it is characterized in that described anaerobic digestion temperature is 35 ℃.
9, sodium hydroxide solid-state normal-temperature according to claim 1 is handled the method that improves rice straw anaerobic digestion methane yield, the carbon-nitrogen ratio to 20 of adjusting total system when it is characterized in that feeding in raw material～35: 1.
10, sodium hydroxide solid-state normal-temperature according to claim 9 is handled the method that improves rice straw anaerobic digestion methane yield, regulates the carbon-nitrogen ratio to 25 of total system when it is characterized in that feeding in raw material: 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101260793A CN100390293C (en) | 2005-11-30 | 2005-11-30 | Method for improving rice straw anaerobic digestion methane yield by sodium hydroxide solid-state normal-temperature treatment |
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| CNB2005101260793A CN100390293C (en) | 2005-11-30 | 2005-11-30 | Method for improving rice straw anaerobic digestion methane yield by sodium hydroxide solid-state normal-temperature treatment |
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| CN1814762A true CN1814762A (en) | 2006-08-09 |
| CN100390293C CN100390293C (en) | 2008-05-28 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102559773A (en) * | 2012-03-06 | 2012-07-11 | 北京化工大学 | Method for improving methane-producing performance under synergistic action of mixed quasi-synchronous fermentation of multiple raw materials |
| WO2015006882A1 (en) * | 2013-07-17 | 2015-01-22 | 北京化工大学 | Method for implementing zero emission biogas slurry in pure straw anaerobic digestion |
| CN104498529A (en) * | 2014-12-02 | 2015-04-08 | 东北农业大学 | Acidity and alkalinity control method for dry anaerobic fermentation of straws |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1238283C (en) * | 2004-09-08 | 2006-01-25 | 江西农业大学 | Treating process for water after bamboo fiber processing |
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2005
- 2005-11-30 CN CNB2005101260793A patent/CN100390293C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102559773A (en) * | 2012-03-06 | 2012-07-11 | 北京化工大学 | Method for improving methane-producing performance under synergistic action of mixed quasi-synchronous fermentation of multiple raw materials |
| CN102559773B (en) * | 2012-03-06 | 2016-12-14 | 北京化工大学 | A kind of many raw materials mix the method that nearly synchronous fermentation synergism improves gas generation property |
| WO2015006882A1 (en) * | 2013-07-17 | 2015-01-22 | 北京化工大学 | Method for implementing zero emission biogas slurry in pure straw anaerobic digestion |
| CN104498529A (en) * | 2014-12-02 | 2015-04-08 | 东北农业大学 | Acidity and alkalinity control method for dry anaerobic fermentation of straws |
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| CN100390293C (en) | 2008-05-28 |
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