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Method for reducing methane gas emission in cow dung composting process

A technology of methane gas and cow dung, which is applied in the direction of fertilization equipment, fertilizer mixture, fertilizer treatment control, etc., to reduce the bulk density, reduce methane emissions, and improve the quality of compost

Active Publication Date: 2021-05-04
QINGHAI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in the Qinghai-Tibet Plateau region, cow dung or yak dung is the main livestock manure, how to effectively reduce the emission of CH4 during the fermentation and composting of cow dung or yak dung, there are few existing reports

Method used

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  • Method for reducing methane gas emission in cow dung composting process
  • Method for reducing methane gas emission in cow dung composting process
  • Method for reducing methane gas emission in cow dung composting process

Examples

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Effect test

Embodiment 1

[0039] (1) Preparation of highland barley straw biochar: dry the highland barley straw until the water content is ≤3%, crush it and pass it through an 80-mesh sieve; heat it to 400°C at a heating rate of 5°C / min in an anoxic environment, and carbonize it for 2 hours. After completion, the anoxic environment was maintained for 1 h, and the biochar was collected by cooling; the biochar was ground to 20 mesh, and 1 mol L -1Wash with HCl solution to remove ash, filter, rinse with deionized water to pH 7.0, and dry.

[0040] (2) Compost aerobic fermentation: use cow dung and straw as the basic material, mix according to the carbon-nitrogen ratio of 25, and control the water content to 60%; use the mass ratio of basic material and biochar as 9:1, add highland barley straw biochar ; The fermentation temperature is controlled at 35°C, and the fermentation lasts for 33 days until the compost becomes decomposed.

Embodiment 2

[0042] (1) Preparation of wheat straw biochar: Dry the wheat straw until the water content is ≤3%, crush it and pass it through a 60-mesh sieve; heat it to 300°C at a heating rate of 5°C / min in an anoxic environment, and carbonize it for 3 hours. After completion, the anoxic environment was maintained for 1 h, and the biochar was collected by cooling; the biochar was ground to 10 mesh, and 1 mol L -1 Wash with HCl solution to remove ash, rinse with deionized water to pH 7.3 after filtration, and dry.

[0043] (2) Compost aerobic fermentation: use cow dung and straw as the basic material, mix according to the carbon-to-nitrogen ratio of 30, and control the water content to 63%; the mass ratio of the basic material to biochar is 8:1, and add wheat straw biochar; The fermentation temperature is controlled at 33°C, and the fermentation lasts for 42 days until the compost is fully decomposed.

Embodiment 3

[0045] (1) Preparation of highland barley and wheat straw biochar: dry the highland barley and wheat straw to a moisture content of ≤3%, crush them and pass through a 100-mesh sieve; heat them to 500°C at a heating rate of 10°C / min in an anoxic environment, and carbonize After the carbonization process was completed, the anoxic environment was maintained for 1 h, and the biochar was collected by cooling; the biochar was ground to 30 mesh, and 1mol L -1 Wash with HCl solution to remove ash, rinse with deionized water to pH 7.5 after filtration, and dry.

[0046] (2) Compost aerobic fermentation: use cow dung and straw as basic materials, mix them at a carbon-to-nitrogen ratio of 35, and control the water content to 65%; take the mass ratio of basic materials and biochar as 10:1, add highland barley straw biochar and Wheat straw biochar mixture; the fermentation temperature is controlled at 40°C, and the fermentation lasts for 37 days until the compost is mature.

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Abstract

The invention provides a method for reducing methane gas emission in a cow dung composting process, and relates to the technical field of livestock and poultry manure fermentation. According to the invention, cow dung and crop straw are used as basic materials, and highland barley straw biochar and / or wheat straw biochar are / is added for aerobic fermentation. The highland barley and wheat straw biochar is used as a conditioner for aerobic composting, so that the stacking density of a compost body is reduced, the air permeability is increased, the compost quality is improved, and the composting process is accelerated; and emission of methane can be reduced to a certain extent, the life activity of beneficial microorganisms is enhanced, and the compost maturity is accelerated.

Description

technical field [0001] The invention belongs to the technical field of livestock and poultry manure fermentation, and in particular relates to a method for reducing methane gas emission during cow manure composting. Background technique [0002] Methane is the second largest greenhouse gas, and its warming potential per molecule is 28-34 times that of carbon dioxide, and the gas concentration is increasing at a rate of about 1% per year, which has an important impact on the energy budget of the global ecosystem and global climate change . According to statistics, greenhouse gas emissions in the process of livestock production account for 15% of the total global gas emissions, of which CO 2 Emissions account for 9% of global gas emissions, CH 4 Emissions account for 37% of global gas emissions, so the warming potential of methane from livestock production cannot be ignored. Under traditional conditions, it is mainly through controlling and changing process conditions, such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F17/70C05G1/00C01B32/05
CPCC05F17/70C05D9/00C01B32/05C05F3/00C05F11/00Y02W30/40Y02E50/30
Inventor 王慧春魏晶晶张浩然胡樱贾慧萍谢惠春雷梅莉王发春刘念
Owner QINGHAI NORMAL UNIV
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