A kind of rice straw fermentation treatment process

A technology of rice straw and processing technology, which is applied in the direction of fermentation, waste fuel, microorganisms, etc., can solve the problems of high energy consumption for stirring, easy acid poisoning, and difficulty in feeding and discharging materials, and achieves efficient reuse of green environmental protection resources, stable methane concentration, The effect of small investment

Active Publication Date: 2021-10-12
CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wet fermentation has the advantages of controlled fermentation conditions, high and stable gas concentration, and continuous feeding, but it also has disadvantages such as large-scale equipment, easy crusting of straw, high energy consumption for stirring, and large biogas slurry volume is difficult to handle.
Although dry fermentation has the advantages of small footprint, large processing capacity, no pollution discharge, and low water consumption, due to the high dry matter concentration of fermentation raw materials, it is easy to cause difficulties in feeding and discharging materials, uneven heat and mass transfer, and easy acidosis. question

Method used

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  • A kind of rice straw fermentation treatment process
  • A kind of rice straw fermentation treatment process
  • A kind of rice straw fermentation treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1: Effect of Fermentation Pretreatment on Rice Straw Gas Production

[0059] 1. Fermentation pretreatment of Absidia umbilicali: prepare the inoculant of Absidum umbilicali according to the above-mentioned method. The rice straw is pulverized by a pulverizer, and the particle size is 1-2 cm. Take 2kg of straw, take bacterium agent with a mass of 1% of the dry weight of rice straw and urea with a weight of 0.5% of the dry weight of rice straw, adjust the moisture content of the straw to 65%, cover it with film, and pretreat it for 3 days at a constant temperature of 35°C, as the experimental group . The rest of the conditions are the same, and the same mass of high-temperature sterilized bacteria agent is added as a blank group.

[0060] 2. Mix the pretreated rice straw fermentation products of the experimental group and the blank group with the domesticated inoculum. The mass of the domesticated inoculum is 30% to 50% of the total mass, and adjust the water co...

Embodiment 2

[0066] Embodiment 2: Effect of fermentation method on rice straw gas production

[0067] 1. Use the method of the experimental group in the first embodiment to carry out the same pretreatment on the experimental group and the blank group in the second embodiment.

[0068] 2. Put the pretreated experimental group into the two-phase fermentation reactor, and put the blank group into the dry fermentation reactor. The blank group runs for 55 days, and the experimental group runs for 45 days.

[0069] The two-phase reactor of the experimental group included a filtrate spraying device. After loading the fermentation substrate into the reactor, add deionized water whose volume is 1 / 3 of the solvent volume of the reactor. The deionized water infiltrates all the fermentation substrate under the action of gravity, and then leaches out to form the water extract of the fermentation substrate to form a filtrate. The filtrate enters the filtrate spraying device, and sprays the fermentatio...

Embodiment 3

[0075] Example 3: Effects of Different Strains on Gas Production of Rice Straw

[0076] 1. Use the method of the experimental group in Example 2 to conduct experiments on the gas production effects of different strains of rice straw. The experimental treatment methods are exactly the same, only the strains used are different. Among them, the same amount of bacteria agent sterilized by high temperature was added as the blank group. The specific treatment of each group is shown in Table 5.

[0077] Table 5 Specific treatment table for each group

[0078]

[0079]

[0080] 2. Put each group after pretreatment into a two-phase fermentation reactor, spray the same amount of filtrate (3 times / day) to each group regularly every day, and take samples regularly to measure gas production and methane gas concentration. The specific results are shown in Table 6. The gas production rate in the table refers to the volume of biogas produced per kilogram of volatile solid matter.

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Abstract

The invention belongs to the field of biological fermentation, and relates to a technology of rice straw pretreatment and dry fermentation to produce biogas. The technical scheme is: a strain of Abdominal umbilicali, the preservation number of which is CGMCC No.16486. Utilize the Absteria coliformis to prepare bacterial agent; mix dry rice straw, bacterial agent and urea in a weight ratio of 200:2:1, adjust the moisture content of the straw to 60-75%, obtain a fermentation substrate, and pack Fermentation is carried out in a two-phase fermentation reactor; the filtrate obtained when water is adjusted is a fermentation liquid; during the fermentation process, the fermentation liquid is used to spray the fermentation substrate at least once a day, and the amount of the fermentation liquid used for a single spray is the above-mentioned 1 / 3 of the volume of the fermentation substrate; after 40 to 50 days of fermentation, the treatment is completed, and the fermentation product can be obtained as required. The present invention provides a new strain of Abdomyces genus, which can be combined with a physical method and applied to the treatment and fermentation of rice straw, so as to realize the high-efficiency reuse of green and environment-friendly resources.

Description

technical field [0001] The invention belongs to the field of biological fermentation, and in particular relates to a rice straw fermentation treatment process. Background technique [0002] In recent years, due to the extensive use of fossil fuels, CO 2 And other greenhouse gas emissions have caused a strong greenhouse effect and climate change. With the deepening of the country's attention to environmental protection and resource utilization, the exploration and development of renewable energy is becoming more and more important and urgent. Biogas is a more stable and cleaner renewable energy than fossil fuels. The use of crop stalks to ferment biogas not only effectively treats stalks, but also produces clean and easy-to-use energy-methane. At the same time, the by-products of biogas residue and biogas slurry are rich in plant nutrients such as nitrogen and phosphorus. High-quality organic fertilizer, used in agricultural production, can effectively increase crop yield....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N1/14C12N1/36C12P5/02C12R1/645
CPCC12N1/14C12N1/36C12P5/023C12P2203/00C12N1/145C12R2001/645Y02E50/30
Inventor 闫志英刘杨许力山姬高升房俊楠曾勇宦臣臣佟欣宇赵琪琪
Owner CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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