Ensiling method for improving yield of methane produced through anaerobic fermentation of straw

A technology for anaerobic fermentation and biogas production, applied in fermentation, waste fuel and other directions, can solve the problems of destroying the lignocellulose structure of straw, loss of excessive organic components, etc., to improve biogas production, reduce losses, and avoid lignin the effect of

Active Publication Date: 2019-06-14
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These existing methods mainly focus on destroying the stalk itself in the process of silage by adding fermentation promoters (such as lactic acid bacteria, cellulase, etc.), or fermentation inhibitors (such as acid, or acidic iron salts, etc.). However, the current silage method will lose too much organic components (soluble sugar, soluble protein, fat, etc.), and has limitations in destroying the complex lignocellulose structure in the straw.

Method used

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  • Ensiling method for improving yield of methane produced through anaerobic fermentation of straw
  • Ensiling method for improving yield of methane produced through anaerobic fermentation of straw

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Embodiment 1

[0025] The present invention proposes a silage method for improving straw biogas fermentation yield, and the present invention can be implemented by the following methods:

[0026] Preparation of silage stalks: crush the newly harvested corn stalks at the wax ripening stage to a length of 0.5-3 cm, and then spray a calcium peroxide solution with a concentration of 8 wt% in the crushed corn stalks, and the calcium peroxide solution is added in an amount of 40 mL / kg fresh Straw, stir evenly to obtain silage preparation;

[0027] Then prepare the silage and load it into a cellar: the depth of the silage cellar is 2.5 meters, each filling is 40 cm thick, tamp it with a stone pestle, and evenly spray an ammonia solution with a concentration of 15wt% on the upper surface of the silage once, and the amount of ammonia solution added is 80mL / kg silage Prepare the material, and then continue to repeat the filling of a new layer in the order of "filling-tamping-spraying" until the compac...

Embodiment 2

[0030] Preparation of silage stalks: crush the newly harvested corn stalks at the milk maturity stage to a length of 0.5-3 cm, and then spray a calcium peroxide solution with a concentration of 7 wt% in the crushed corn stalks, and the amount of calcium peroxide solution added is 30 mL / kg fresh Straw, stir evenly to obtain silage preparation;

[0031] Then prepare the silage and load it into a cellar: the depth of the silage cellar is 2.7 meters, each filling is 50 cm thick, tamp it with a stone pestle, and evenly spray an ammonia solution with a concentration of 18wt% on the upper surface of the silage, and the amount of ammonia solution added is 60mL / kg silage Prepare the material, and then continue to repeat the filling of a new layer in the order of "filling-tamping-spraying" until the compacted straw exceeds 40cm from the pit mouth. Cover it with 30 cm thick soil to seal it, and store it at natural temperature (5-25° C.) for 40 days to obtain silage straw.

[0032] Appli...

Embodiment 3

[0034] Preparation of silage stalks: crush the newly harvested mature corn stalks to a length of 0.5-3 cm, and then spray the crushed corn stalks with a concentration of 4wt% calcium peroxide solution, and the amount of calcium peroxide solution added is 50mL / kg of fresh stalks , to obtain silage stock preparation after stirring evenly;

[0035] Then prepare the silage and load it into a cellar: the depth of the silage cellar is 2.5 meters, each filling is 30 cm thick, tamp it with a stone pestle, and evenly spray an ammonia solution with a mass percentage concentration of 10wt% on the upper surface of the silage material once, and the amount of ammonia solution added is 130mL / kg silage preparation, and then continue to repeat the filling of a new layer in the order of "filling-tamping-spraying" until the compacted straw exceeds 50cm from the pit mouth, and the pit mouth is covered with plastic cloth. The plastic cloth is covered with 30 cm thick soil for sealing, and stored ...

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Abstract

The invention provides an ensiling method for improving the yield of methane produced through anaerobic fermentation of straw. The ensiling method comprises the following steps that the newly harvested straw is smashed into the length of 0.5-3.0 cm; an ensiling additive A is sprayed to the smashed straw, uniform stirring is conducted, and silage stock is obtained; the uniformly prepared silage stock is placed into a silage pit in layers; the method for filling the silage stock into each layer comprises the steps that each layer is filled with the straw with the thickness of 30-60 cm, the strawis compacted, and an ensiling additive B is uniformly sprayed on the upper surface of the straw; after filling of the silage stock is completed, sealing is conducted to form an anaerobic environment,closed storage is conducted for 30-90 days at the natural temperature of 5-25 DEG C, and ensiled straw is obtained, wherein the ensiling additive A is a calcium peroxide solution, and the ensiling additive B is an ammonium hydroxide solution. By means of the ensiling method, the straw can be prevented from being mildewed and decayed, loss of nutrients in the straw is reduced, and the yield of themethane produced through anaerobic fermentation of the straw is effectively improved.

Description

technical field [0001] The invention relates to the field of energy utilization of agricultural solid waste, in particular to a silage method for increasing the amount of biogas produced by anaerobic fermentation of straw. Background technique [0002] The annual output of crop straw in my country is 900 million tons, but the comprehensive utilization of straw is still in its infancy, the degree of industrialization is low, and the technical foundation is relatively weak. Except that some straws are used as feed, fertilizer returning to the fields, and domestic fuel, most of the straws are piled up or discarded at will, which not only wastes resources, but also pollutes the environment. The production of biogas from straw is an effective method for energy utilization of straw. However, the lignocellulosic straw is complex and stable. Without pretreatment, the cellulose and hemicellulose in the straw are difficult to be efficiently utilized by microorganisms. At present, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
CPCY02E50/30
Inventor 孙优善沈伯雄龚旭东王志强张长平
Owner HEBEI UNIV OF TECH
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