A method for anaerobic-aerobic balanced fermentation of agricultural waste

A technology of agricultural waste and fermentation method, which is applied in the field of rural energy and environmental protection, can solve the problems of long anaerobic fermentation cycle, low nutrient content of biogas fertilizer, and poor efficiency of biogas fertilizer, so as to reduce energy loss, reuse efficiently, save The effect of time cost

Active Publication Date: 2021-08-10
ACADEMY OF PLANNING & DESIGNING OF THE MINIST OF AGRI
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  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of agricultural waste anaerobic-aerobic balanced fermentation method, this fermentation method solves the defects of existing anaerobic fermentation cycle long, biogas manure nutrient content is low, biogas fertilizer efficiency is poor, through anaerobic-aerobic Aerobic balanced fermentation produces clean biogas energy and high-quality organic fertilizer

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  • A method for anaerobic-aerobic balanced fermentation of agricultural waste

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Effect test

Embodiment 1

[0042] Embodiment 1: Fermentation is carried out with the cow feces of a cow farm as the research object

[0043] (1) Collect about 20 kg of agricultural waste of this type (mainly feces and litter excreted during cow feeding, but not limited to this), discard impurities such as hair and stones, and add wheat straw to adjust the C / N to 25:1, add anaerobic fermentation tank bottom sludge as an inoculum, the inoculum amount is 30%, adjust the pH value to 7.47, and TS to 10%.

[0044] (2) Put the material into a 50L sequencing batch anaerobic fermentation reactor, after 11 days, the anaerobic fermentation at 38°C reached the peak gas production stage, and collected biogas as domestic gas. The average volumetric gas production rate during the fermentation process was 1.63 m 3 m -3 d -1; The material is separated by a solid-liquid separator to obtain biogas residue and biogas slurry. Among them, the C / N of biogas residue is 19.07, the mass moisture content is 57.18%, and the CO...

Embodiment 2

[0048] Embodiment 2: Taking corn as research object to carry out fermentation

[0049] (1) Collect about 500 kg of agricultural wastes of this type (mainly discarded tail leaves from the growth process of corn and residual straw after harvesting corn), discard impurities such as hair and stones, and add chicken manure to adjust the C / N to 25 : 1, add anaerobic fermentation tank bottom sludge as inoculum, the inoculum size is 40%, the pH value is 7.81, and the TS is 25%.

[0050] (2) Put the material into 1m 3 In the volumetric sequencing batch anaerobic fermentation reactor, after 14d38℃ mesophilic anaerobic fermentation to reach the peak gas production stage, biogas is collected as domestic gas, and the average volumetric gas production rate during the fermentation process is 2.07m 3 m -3 d -1 ; The material is separated by a solid-liquid separator to obtain biogas residue and biogas slurry. Among them, the C / N of biogas residue is 21.7, the mass moisture content is 50.7%...

Embodiment 3

[0054] Embodiment 3: Fermentation is carried out with rural tail vegetables as research object

[0055] (1) Collect about 1 ton of agricultural wastes of this type (mainly the low economic value remaining after the harvest of farmland vegetables, but not limited to this), crush them to a length of 1-3 cm, and add the bottom sludge of the anaerobic fermentation tank as For the inoculum, the inoculation amount is 30%, the C / N value of the adjusted material is 25:1, the pH value is 7.1, and the TS is 10%.

[0056] (2) Put the material into 5m at one time 3 In a biogas digester with a large volume, after 12d38℃ medium temperature anaerobic fermentation to reach the peak stage of gas production, the biogas is collected as domestic gas, and the average volumetric gas production rate during the fermentation process is 1.53m 3 m -3 d -1 ; The material is separated by a solid-liquid separator to obtain biogas residue and biogas slurry. Among them, the C / N of biogas residue is 17.83...

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Abstract

The invention discloses an anaerobic-aerobic balanced fermentation method for agricultural waste. The fermentation method comprises the following steps: (1) adding an inoculum to the pulverized agricultural waste for anaerobic fermentation; (2) using the biogas generated by the anaerobic fermentation as domestic gas, and separating the material to obtain biogas residue; (3) ) adding auxiliary materials to biogas residue for aerobic fermentation to obtain biological humic acid fertilizer. The biological humic acid fertilizer produced by the invention is completely harmless through anaerobic fermentation and high-temperature composting, effectively controls the spread of diseases and insect pests, and also reduces the occurrence probability of diseases and insect pests in the subsequent growth process of plants applied with the organic fertilizer. The invention utilizes the agricultural waste to produce organic fertilizer, which is an efficient reuse of the agricultural waste, expands the industrial chain of the agricultural waste, prolongs the link of resource utilization, and is a powerful impetus to the agricultural circular economy.

Description

technical field [0001] The invention relates to an anaerobic-aerobic balanced fermentation method, in particular to an anaerobic-aerobic balanced fermentation method for agricultural waste, belonging to the technical field of rural energy and environmental protection. Background technique [0002] With the major changes in agricultural production methods and rural energy consumption methods, the demand for rural biogas energy has weakened, and the demand for organic fertilizers has increased. In one cycle (about 30 days) of sequential batch anaerobic fermentation, the daily gas production can reach the highest value on the 6th to 15th day, and the cumulative gas production can reach 60% to 85% of the whole cycle on the 14th to 16th day. After that, the gas production is close to At the lowest value, a large amount of nutrients flowed into the biogas slurry, prolonging the anaerobic fermentation cycle. Usually, the organic matter content of biogas residue is 9.05%-42.9%, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/80C05F17/20C05F17/50C12M1/107
CPCC05F3/00C12M1/107C05F17/50C05G3/80C05F5/002C05F11/00C05F11/02Y02W30/40
Inventor 孟海波赵立欣沈玉君丁京涛刘烨王健程红胜周海宾张曦
Owner ACADEMY OF PLANNING & DESIGNING OF THE MINIST OF AGRI
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