CN109666704B - Method for preparing methane by furfural wastewater and crop straw full-pulp anaerobic fermentation - Google Patents
Method for preparing methane by furfural wastewater and crop straw full-pulp anaerobic fermentation Download PDFInfo
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- CN109666704B CN109666704B CN201910139640.3A CN201910139640A CN109666704B CN 109666704 B CN109666704 B CN 109666704B CN 201910139640 A CN201910139640 A CN 201910139640A CN 109666704 B CN109666704 B CN 109666704B
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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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- 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
A method for preparing methane by furfural wastewater and crop straw full-pulp anaerobic fermentation belongs to organic waste application and environmental protection technology; the method comprises the following steps: uniformly mixing the crushed crop straws with furfural wastewater, and sealing and standing to obtain pretreated mixed slurry; to pre-treated mixed pulpAdding Ca (OH) to the solution2Adjusting the pH value to 6.5-7.5 to obtain mixed slurry, adding the mixed slurry into a fermentation tank, adding inoculated sludge and clear water, adjusting TS to 4-8%, and continuously fermenting at 34-38 ℃ to produce methane gas for 15-25 days; the method uses the furfural wastewater generated in the furfural production process through sulfuric acid depolymerization and crop straws for the first time for methane production, and has the characteristics of novel, unique and simple method, low production cost, no environmental pollution and high total methane yield.
Description
Technical Field
The invention belongs to the technical field of environmental protection and organic waste recycling and energy application, and mainly relates to a process method for preparing methane by adopting furfural wastewater to pretreat crop straws and then using all slurry for anaerobic fermentation.
Background
The treatment of crop straws is a long-standing problem in China, and the production of biogas-methane by an anaerobic fermentation technology is one of the effective methods for treating crop straws at present. However, the complex structure of lignocellulose in crop straw has largely limited methane production and yield. Unstable hemicellulose is hydrolyzed through olefine acid pretreatment, so that a compact wood fiber structure is damaged, and the method is an effective method for improving the yield of methane and improving the production of methane.
However, anaerobic fermentation of biomass is a low-profit process technology with the main objective of treating waste, and a high-cost olefinic acid pretreatment technology is not commercially viable. In addition, due to the limitation of anaerobic fermentation process (the optimum pH environment of methanogens is 6.8-7.2), the acid pretreated straws need to be washed to be neutral and then fermented, reducing sugar hydrolyzed by hemicellulose in the straws can be washed away to reduce a fermentation substrate, and the anaerobic fermentation effect is influenced.
The furfural wastewater is industrial wastewater in the process of producing furfural by depolymerizing crop straws and sulfuric acid at high temperature, and is discharged after being purified due to strong acidity, high COD and low toxicity, so that the industrial cost is increased. How to organically combine two waste resources, reduce the treatment cost, prepare high-yield methane and increase additional economic benefits is very necessary.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides bran for the first time by combining the actual need of methane production through anaerobic fermentationThe method for preparing methane by full-pulp anaerobic fermentation of aldehyde wastewater and crop straws pretreats the crop straws with low-cost waste acid liquor, solves the problem of difficult degradation of lignocellulose, and simultaneously leads all pretreated pulp to pass through low-cost Ca (OH)2After the PH is adjusted, the fermented product is directly used as a fermentation substrate for anaerobic fermentation, so that the purposes of changing waste into effective, reducing the harmless treatment cost of the waste, avoiding the loss of reducing sugar and environmental pollution and improving the yield of methane are achieved.
The invention aims to realize the method for preparing methane by full-pulp anaerobic fermentation of furfural wastewater and crop straws, which comprises the following steps:
①, a pretreatment stage, namely crushing crop straws into segments with the length dimension of less than 2cm, uniformly mixing the crushed crop straws with furfural wastewater according to the solid-to-liquid ratio of 1g to 10ml, and then hermetically standing for 6 days at the temperature of 34-36 ℃ or 3 days at the temperature of 48-50 ℃ to obtain pretreated mixed slurry;
② neutralization stage adding Ca (OH) to the pre-treated mixed slurry2Stirring uniformly, and adjusting the pH value to 6.5-7.5 to obtain mixed slurry for later use;
③, anaerobic fermentation stage, adding the mixed slurry obtained from the neutralization stage into a fermentation tank, adding inoculated sludge and clear water, adjusting TS to 4-8%, stirring uniformly, and continuously fermenting at 34-38 ℃ to produce methane gas for 15-25 days.
The invention firstly uses the furfural wastewater produced in the process of producing furfural products by depolymerizing crop straws and sulfuric acid at high temperature for the anaerobic fermentation of the crop straws to produce methane gas, and has the following advantages:
1) the furfural wastewater is used as a pretreatment catalyst, so that the pretreatment cost is reduced, the furfural wastewater purification cost is saved, and the possibility of environmental pollution caused by improper treatment is avoided.
2) The pretreatment technology has low difficulty and mild conditions, and does not need high temperature and high pressure and special material equipment.
3)Ca(OH)2As pH regulator, it has low cost, and calcium ions ionized after dissolving in water can promote anaerobic reactionAnd (5) fermenting.
4) The mixed slurry with unseparated solid and liquid after pretreatment is completely used for anaerobic fermentation, the link of washing crop straws by clear water is saved, the water quantity is saved, the secondary environmental pollution is avoided, the reducing sugar dissolved in the pretreatment solution can be preserved, and simultaneously, the fatty acid in the furfural wastewater is Ca (OH)2There will be a partial retention after neutralization to provide additional substrate for anaerobic fermentation.
5) The pretreated crop straws are easier to hydrolyze, the gas production performance is improved, and the total yield of methane is improved.
Detailed Description
The embodiments of the present invention are described in detail below. A method for preparing methane by furfural wastewater and crop straw full-pulp anaerobic fermentation comprises the following steps:
①, a pretreatment stage, namely crushing crop straws into segments with the length dimension of less than 2cm, uniformly mixing the crushed crop straws with furfural wastewater according to the solid-to-liquid ratio of 1g to 10ml, and then hermetically standing for 6 days at the temperature of 34-36 ℃ or 3 days at the temperature of 48-50 ℃ to obtain pretreated mixed slurry;
② neutralization stage adding Ca (OH) to the pre-treated mixed slurry2Stirring uniformly, and adjusting the pH value to 6.5-7.5 to obtain mixed slurry for later use;
③, anaerobic fermentation stage, adding the mixed slurry obtained from the neutralization stage into a fermentation tank, adding inoculated sludge and clear water, adjusting TS to 4-8%, stirring uniformly, and continuously fermenting at 34-38 ℃ to produce methane gas for 15-25 days.
Multiple scientific research experiments prove that under the condition of the same scale, the total yield of methane prepared by furfural wastewater and crop straw full-pulp anaerobic fermentation is increased by 22.5-59.3% compared with the total yield of methane prepared by traditional anaerobic fermentation, the yield increase range is large, the preparation cost is low, no environmental pollution is caused, and the method has remarkable social benefit and economic benefit.
Claims (1)
1. A method for preparing methane by furfural wastewater and crop straw full-pulp anaerobic fermentation is characterized by comprising the following steps: the method comprises the following steps:
①, a pretreatment stage, namely crushing crop straws into segments with the length dimension of less than 2cm, uniformly mixing the crushed crop straws with furfural wastewater according to the solid-to-liquid ratio of 1g to 10ml, and then hermetically standing for 6 days at the temperature of 34-36 ℃ or 3 days at the temperature of 48-50 ℃ to obtain pretreated mixed slurry;
② neutralization stage adding Ca (OH) to the pre-treated mixed slurry2Stirring uniformly, and adjusting the pH value to 6.5-7.5 to obtain mixed slurry for later use;
③, anaerobic fermentation stage, adding the mixed slurry obtained from the neutralization stage into a fermentation tank, adding inoculated sludge and clear water, adjusting TS to 4-8%, stirring uniformly, and continuously producing methane gas at 34-38 ℃ for 15-25 days.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910139640.3A CN109666704B (en) | 2019-02-26 | 2019-02-26 | Method for preparing methane by furfural wastewater and crop straw full-pulp anaerobic fermentation |
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| CN201910139640.3A CN109666704B (en) | 2019-02-26 | 2019-02-26 | Method for preparing methane by furfural wastewater and crop straw full-pulp anaerobic fermentation |
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| CN109666704B true CN109666704B (en) | 2020-01-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN102533871A (en) * | 2012-01-09 | 2012-07-04 | 天津大学 | Method for treating crop straws by utilizing acidizing fermentation liquor backflow and applications thereof |
| CN103214045B (en) * | 2013-03-26 | 2015-09-16 | 河北科技大学 | A kind for the treatment of process of furfural waste-water |
| CN103266136B (en) * | 2013-05-15 | 2015-01-07 | 中国科学院广州能源研究所 | Method for producing biogas through utilizing lignocellulose raw material |
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