Rice straw fermentation treatment technology

A technology of rice straw and treatment process, applied in fermentation, biochemical equipment and methods, microorganisms, etc., can solve the problems of large stirring energy consumption, easy acidosis, uneven heat and mass transfer, etc., and achieve efficient and repeated green environmental protection resources The effect of utilization, stable methane concentration, and strong operability

Active Publication Date: 2019-02-15
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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  • Rice straw fermentation treatment technology
  • Rice straw fermentation treatment technology
  • Rice straw fermentation treatment technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1: Effect of fermentation pretreatment on gas production of rice straw

[0059] 1. Fermentation pretreatment of A. agaricus: prepare the microbial inoculum of A. agaricus by the above-mentioned method. The rice straw is pulverized by a pulverizer, and the particle size is 1-2 cm. Take 2 kg of straw, take the inoculum with a mass of 1% of the dry weight of the rice straw and urea with a mass of 0.5% of the dry weight of the rice straw, adjust the moisture of the straw to 65%, cover it with film, and pre-treat it for 3 days under the constant temperature of 35 °C as the experimental group. . The rest of the conditions were the same, and the same quality of inoculum after high temperature sterilization was added as the blank group.

[0060] 2. Mix the pretreated rice straw fermentation product of the experimental group and the blank group with the domesticated inoculum. Three groups of dry fermentation reactors were made in parallel.

[0061] The blank group wa...

Embodiment 2

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

[0067] 1. The same pretreatment was performed on the experimental group and blank group of Example 2 using the method of the experimental group in Example 1.

[0068] 2. The pretreated experiments were assembled into a two-phase fermentation reactor, and the blank was assembled into a dry fermentation reactor. The blank group ran for a total of 55 days, and the experimental group ran for 45 days.

[0069] The two-phase reactor of the experimental group contained a filtrate spray device. After loading the fermentation substrate into the reactor, a volume of 1 / 3 the volume of the reactor solvent was added with deionized water. The deionized water infiltrates all the fermentation substrates under the action of gravity, and then leaches out, which is the water extract of the fermentation substrates to form a filtrate, and the filtrate enters the filtrate spray device to spray the fermentation subst...

Embodiment 3

[0075] Example 3: Effects of different strains on gas production from rice straw

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

[0077] Table 5 The specific treatment table of each group

[0078]

[0079]

[0080] 2. Put the pretreated groups into the two-phase fermentation reactor, spray the same amount of filtrate (3 times / day) to each group at regular intervals every day, and measure the gas production and methane gas concentration by sampling regularly. 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 matte...

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Abstract

The invention belongs to the field of biological fermentation, and relates to a rice straw pretreatment and dry fermentation technology for producing methane. The technology adopts the technical scheme that phycomycetes is provided, with the preservation number being CGMCC No.16486. The technology comprises the following steps: preparing an inoculant from the phycomycetes; mixing dry rice straws,the inoculant and urea with the weight ratio being 200:2:1, and adjusting the water of the straws to be 60 to 75 percent, so as to obtain a fermentation substrate, and loading the fermentation substrate into a two-phase fermentation reactor to perform fermentation; ensuring that filtrate obtained during water adjustment is fermentation liquor; spraying the fermentation substrate at least once a day with the fermentation liquor during fermentation, ensuring that the amount of the fermentation liquor for single spraying is 1 / 3 the volume of the fermentation substrate; and performing fermentationfor 40 to 50 days to accomplish the treatment, so as obtain fermentation products according to the requirements. The novel phycomycetes bacterial strain can be applied to rice straw treatment and fermentation through a physical method, so as to realize green and environment-friendly resource efficient reuse.

Description

technical field [0001] The invention belongs to the field of biological fermentation, and in particular relates to a process for fermentation treatment of rice straw. 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 has become more and more important and urgent. Biogas is a more stable and clean renewable energy source than fossil fuels. The use of crop straw fermentation to produce biogas not only effectively treats straw, but also produces clean and easy-to-use energy - methane. At the same time, the by-product biogas residue and biogas slurry are rich in nitrogen and phosphorus and other plant nutrients. High-quality organic fertilizers, used in agricultural production, can effective...

Claims

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Application Information

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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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