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Method for preparing methane by pretreating asparagus straws with NaOH

A technology for pretreatment and asparagus, which is applied in the field of biomass energy utilization, can solve problems such as undiscovered reports, and achieve the effects of improving biological digestibility, accelerating degradation, and making the process simple and easy.

Inactive Publication Date: 2012-03-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] After searching the literature of the prior art, it is found that NaOH is mostly used to pretreat the stalks of food crops to produce biogas, and the waste generated in the process of planting asparagus vegetables is subjected to alkaline pretreatment and biogas production. No reports found yet

Method used

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  • Method for preparing methane by pretreating asparagus straws with NaOH
  • Method for preparing methane by pretreating asparagus straws with NaOH
  • Method for preparing methane by pretreating asparagus straws with NaOH

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Using the asparagus stalks obtained in step ②, add NaOH solution with the same mass as the asparagus stalks and a concentration of 6%, the pretreatment time is 20 days, and the fermentation time is 25 days. The pretreatment temperature is 25±1°C; the biogas fermentation temperature is 35±1°C, the total volume of the fermentation broth is 800mL, the ratio of inoculation sludge to the mass of all reaction materials is 30%, and the total solid content of the fermentation broth is 6%.

[0039] The contents of cellulose, hemicellulose and lignin after NaOH pretreatment and biogas fermentation of asparagus straw were as follows (mass fraction):

[0040] Table 3 Changes of cellulose, hemicellulose and lignin content after asparagus straw pretreatment and biogas fermentation

[0041]

[0042] The total gas production in 25 days of biogas fermentation is 10754mL, CH 4 The daily maximum content is 63.91%.

Embodiment 2

[0044] Using the asparagus stalks obtained in step ②, add NaOH solution with the same mass as the asparagus stalks and a concentration of 6%, the pretreatment time is 15 days, and the fermentation time is 25 days. The pretreatment temperature is 25±1°C; the biogas fermentation temperature is 35±1°C, the total volume of the fermentation broth is 800mL, the ratio of inoculation sludge to the mass of all reaction materials is 30%, and the total solid content of the fermentation broth is 6%.

[0045] The contents of cellulose, hemicellulose and lignin after NaOH pretreatment and biogas fermentation of asparagus straw were as follows (mass fraction):

[0046] Table 4 Changes of cellulose, hemicellulose and lignin content after asparagus straw pretreatment and biogas fermentation

[0047]

[0048] The total gas production of 25 days of biogas fermentation is 9461mL, CH 4 The daily maximum content is 60.73%.

Embodiment 3

[0050] Using the asparagus stalks obtained in step ②, add NaOH solution with the same mass as the asparagus stalks and a concentration of 5%, the pretreatment time is 20 days, and the fermentation time is 30 days. The pretreatment temperature is 25±1°C, the biogas fermentation temperature is 35±1°C, the total volume of fermentation broth is 800mL, the ratio of inoculated sludge to the mass of all reaction materials is 30%, and the total solid content of fermentation broth is 6%.

[0051] The contents of cellulose, hemicellulose and lignin after NaOH pretreatment and biogas fermentation of asparagus straw were as follows (mass fraction):

[0052] Table 5 Changes of cellulose, hemicellulose and lignin content after asparagus straw pretreatment and biogas fermentation

[0053]

[0054] The total gas production in 25 days of biogas fermentation is 12833mL, CH 4 The daily maximum content is 64.03%.

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Abstract

The invention relates to a method for preparing methane by pretreating asparagus straws with NaOH. The method comprises the seven steps of: harvesting the asparagus straws, crushing, preparing for inoculation of sludge, pretreating with the NaOH, regulating the pH and methane-fermenting. Degradable organic matters in the asparagus straws are converted into methane under the action of microorganisms. Compared with the prior art, the method disclosed by the invention has the advantages that agricultural wastes are pretreated with the NaOH, internal tissues in lignocelluloses are broken, cellulose is released from lignin and hemicelluloses bundles, thus the degradation of the cellulose is accelerated, and the biological digestion property, the methane producing potential, the economical efficiency and the feasibility of the asparagus straws are improved.

Description

technical field [0001] The invention relates to a method in the field of biomass energy utilization, in particular to a method for preparing biogas by pretreating asparagus stalks with NaOH. Background technique [0002] In 2008, the annual output of asparagus in the suburbs of Shanghai reached 3,000 tons, and the output of asparagus waste straw was 1,000 tons. Similar to the environmental pollution problems of other agricultural wastes such as vegetables and crop stalks, a large amount of asparagus stalks are randomly stacked on both sides of the road in the field, naturally stacked and fermented, emitting odorous gases, and becoming toxic waste that affects the production and living environment of farmers. Therefore, it is imminent to deal with the recycling of planting waste represented by asparagus stalks. [0003] Biomass wastes generated during asparagus production mainly include underground rhizomes (vegetative organs) and aboveground stalks (photosynthetic organs). ...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCY02E50/30
Inventor 刘荣厚孙辰曹卫星尹仁湛吴小武
Owner SHANGHAI JIAO TONG UNIV
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