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Pretreatment method capable of improving straw biomass anaerobic digestion rate

An anaerobic digestion and biomass technology, applied in the field of straw biogas engineering system, can solve the problems that restrict the large-scale development of biogas engineering, achieve the effect of reducing construction investment, reducing land occupation, and improving anaerobic digestion rate

Inactive Publication Date: 2014-04-23
ACADEMY OF PLANNING & DESIGNING OF THE MINIST OF AGRI
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the traditional on-site silage method seriously restricts the large-scale development of this type of biogas project

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The test stalks were harvested corn stalks with a moisture content of about 70% and a pH value of 7.34. After the corn stalks are harvested, they are spread out in the field with a thickness of about 30 cm. After about 20 days of natural wind and sun, the moisture content of the corn stalks reaches about 35% to 40%, and there is no need to adjust the dry humidity; use a sprayer to spray the formic acid solution on the straw (30%), evenly sprayed twice, the straw pH value dropped from 7.34 to 6.54. The bundles are compacted and bundled by a special corn stalk baler, and the straw bales have a specification of 56cm×41cm×33cm (length×width×height) and weigh 12kg. After baling, use polyethylene stretched plastic wrap to wrap four layers of stretched film on straw bales, seal them, and then stack them for storage. After micro-storage for 20 days, the straw and inoculated sludge entered the anaerobic digestion reactor at a ratio of 1:10, and fermented at 38°C. The reactor vo...

Embodiment 2

[0034] The micro-storage time of straw in Example 1 was changed to 30 days, the anaerobic reaction cycle was 13 days, and other operating conditions remained unchanged. The gas production was measured every day. After the reaction, compared with the control experiment, the cumulative gas production of straw materials stored for 30 days increased by 8.3 times, and the daily gas production per unit weight of straw increased by 7.7 times.

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Abstract

The invention belongs to the field of utilization of waste biomass resources, and discloses a pretreatment method capable of improving crop straw biomass anaerobic digestion rate, which mainly solves the problems of longer anaerobic digestion cycle, low digestion rate and the like of the existing crop straw. According to the invention, the straw is directly bundled and stored in the field, so the land occupation area of the methane engineering is reduced, the investment is reduced, and the like; meanwhile, the methane yield can be increased, and the economic benefits are good. The pretreatment method particularly comprises the following steps: after the integral straw is harvested, naturally airing the straw in the field to enable the water content to reach 35% to 40%; carrying out chemical treatment by a fermentation inhibiting agent, wherein the usage amount of the fermentation agent is 300 to 400 ml per 100 kg of a raw material, and reducing the pH value; after acidifying, mechanically compacting and bundling, wherein the straw bundling density is about 130 to 140 kg / m3; coating and sealing the straw by thin films, and storing for 20 to 30 days; taking the slightly stored straw and inoculating silt, inoculating according to the ratio of 1:10, and carrying out the anaerobic digestion reaction, wherein the reaction temperature is 38 to 40 DEG C and the reaction time is 15 to 20 days. The technique has broad application prospect in the straw methane engineering.

Description

technical field [0001] The invention relates to a technology for improving the anaerobic digestion efficiency of straw-like biomass, which can be widely used in straw biogas engineering systems. Background technique [0002] Crop straw resource is the most abundant renewable resource on the earth, seeking its efficient utilization has been the concern of many scholars. According to incomplete estimates, the world can produce nearly 2 billion tons of straw every year, while the annual output of crop straw in my country is about 600-700 million tons, ranking first in the world, and mainly corn, wheat and rice straw, accounting for the total straw. 80% of the output. In addition to being used for paper making, feed or feed raw materials, and fertilizer making and returning to the field, there are about 370 million tons of straw that can be used as energy materials. [0003] Crop straw is an important biomass energy rich in organic matter (80%-90%), and the content of lignocell...

Claims

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Application Information

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IPC IPC(8): C12P5/02
Inventor 赵立欣宋成军罗娟陈羚田宜水齐岳王骥
Owner ACADEMY OF PLANNING & DESIGNING OF THE MINIST OF AGRI
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