Crop straw ensiling and method for efficiently producing biogas by ensiled straws

A crop straw and straw technology, which is applied in the field of agricultural solid waste treatment and recycling, can solve the problems of increased operating components, short straw harvest period, and huge energy consumption, and achieve the effect of improving efficiency

Inactive Publication Date: 2012-10-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the composition of dry straw is mainly lignocellulose, which has a stable structure. If it is dissolved, it will consume a huge amount of energy, resulting in a significant increase in operating components.
Studies have found that the soluble components in freshly harvested green straw are much higher than those in air-dried straw, but if not preserved, these soluble components will be consumed by microor

Method used

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  • Crop straw ensiling and method for efficiently producing biogas by ensiled straws

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The freshly harvested green straw is crushed to 10 mm, and then mixed with a nitric acid solution with a mass concentration of 2%. The weight ratio of the nitric acid solute to the green straw is 1:1000, and the mixture is placed in a storage cellar for 30 days to obtain silage straw. Mix the silage straw and water in the pool for soaking. The weight ratio of the silage straw and water is 1:20, and the soaking time is 6 hours. After soaking, the mixture is squeezed and separated. Oxygen fermentation device is used for biogas production; the separated solid is hydrothermally reacted by using sulfuric acid solution with a mass concentration of 1% as a catalyst. The weight ratio of sulfuric acid solute to solid is 1:200, the reaction temperature is 120°C, and the reaction time is 60 minutes. After the reaction is completed, the solid-liquid mixture is squeezed and separated again, and the separated liquid is diluted and adjusted, and sent to an anaerobic fermentation tank ...

Embodiment 2

[0031] The freshly harvested green straw is crushed to 20 mm, and then mixed with an ammonia solution with a mass concentration of 2%. The weight ratio of the ammonia solute to the green straw is 1:1500, and the mixture is placed in a storage cellar for 90 days to obtain silage straw. Mix the silage straw and water in the pool for soaking. The weight ratio of the silage straw and water is 1:10, and the soaking time is 8 hours. Oxygen fermentation device for biogas production; the separated solid uses nitric acid solution with a mass concentration of 0.5% as a catalyst for hydrothermal reaction, the weight ratio of nitric acid solute to solid is 1:100, the reaction temperature is 200°C, and the reaction time is 5 minutes After the reaction is completed, the solid-liquid mixture is squeezed and separated again, the separated liquid is diluted, adjusted, and then sent to an anaerobic fermentation tank to produce biogas, and the separated solid is used for aerobic composting. The...

Embodiment 3

[0033] The freshly harvested green straw is crushed to 30mm, and then mixed with 10% acetic acid solution, the weight ratio of acetic acid solute to green straw is 1:100, and the mixture is placed in a storage cellar and sealed for 60 days to obtain silage straw. Mix the silage straw and water in the pool for soaking. The weight ratio of the silage straw and water is 1:5, and the soaking time is 4 hours. Oxygen fermentation device for biogas production; the separated solid uses ferric chloride solution with a molar concentration of 0.05mol / L as a catalyst for hydrothermal reaction, the weight ratio of ferric chloride solute to solid is 1:25, and the reaction temperature is 90°C, the reaction time is 90 minutes. After the reaction is completed, the solid-liquid mixture is squeezed and separated again. The separated liquid is diluted and adjusted, and sent to an anaerobic fermentation tank to produce biogas. The separated solid is used for pyrolysis and digestion. The treated b...

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Abstract

The invention relates to crop straw ensiling and a method for efficiently producing biogas by ensiled straws. Newly harvested green straws are smashed to have the lengths between 10mm and 30mm, and the smashed straws are mixed with an ensiling additive; the ensiling additive is a nitric acid or acetic acid or ammonia solution, the mass concentration of the additive solution is 2%-10%, and the weight proportion of added additive solute is 1/100-1/1500 of the weight of the straws. The mixture is stored for 30-90 days under an anaerobic condition in a closed space, and then the ensiled straws are obtained. According to the method disclosed by the invention, a certain amount of additive is added for ensiling the newly harvested green straws, the utilization of saccharides by microbes in the environment can be reduced in the ensiling process, the autologous lignifications process of the straws is restrained at the same time, and the content of free sugars in the green straws is retained at the maximum degree; and most organic matters in the ensiled straws are transferred to liquid phase through two steps of treatment, then the liquid is anaerobically fermented to produce the biogas, and the efficiency of anaerobic fermentation and the utilization ratio of the straws are greatly improved.

Description

technical field [0001] The invention relates to a crop straw silage and a method for efficiently producing biogas from the silage straw, belonging to the field of agricultural solid waste treatment and resource utilization. Background technique [0002] Crop straw is the most abundant biomass resource, but its utilization rate is low at present. Except a part is used for paper making and fodder, most of it is incinerated, which not only wastes resources, but also pollutes the environment. Utilizing straw to produce biogas is an effective method for resource utilization of straw. However, straw has a complex structure and is difficult to be efficiently utilized by microorganisms under normal conditions. At present, the use of straw to produce biogas is mostly mixed with livestock and poultry manure for anaerobic fermentation, but the fermentation efficiency is low, the utilization rate of straw is not high, and the amount of straw to be processed is limited. Therefore, devel...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCY02E50/343Y02E50/30
Inventor 吕学斌赵玉峰孙优善支苏丽
Owner TIANJIN UNIV
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