Method for preparing marsh gas through lignocellulose hydrolysate

A technology of lignocellulose and hydrolyzate, applied in waste fuel, fermentation and other directions, can solve the problems of the influence of microbial activity, the influence of methane production process, and the load should not be too high, so as to reduce the loss of methane, broaden the selectivity, and improve the reaction rate. Effect

Active Publication Date: 2019-10-01
ENERGY RES INST OF SHANDONG ACAD OF SCI
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Problems solved by technology

[0004] Since the hydrolyzate is mainly composed of five-carbon sugars and six-carbon sugars, it has good degradability and utilization performance, and will be quickly converted into volatile organic acids in the anaerobic fermentation process. Volatile organic acids (VFAs) are the main intermediates of methane production. However, organic acids are usually produced quickly within 1-3 days, resulting in a drop in pH value, which will seriously affect the methanogenic process, so there are problems that the load should not be too high and the microorganisms are domesticated. At the same time, under the combination of acid and heat The hydrolyzate obtained below contains by-products such as furfural, which will affect the activity of microorganisms

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  • Method for preparing marsh gas through lignocellulose hydrolysate

Examples

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Embodiment 1

[0027] Embodiment 1: a kind of method that lignocellulose hydrolyzate prepares biogas, it comprises the steps:

[0028] (1) Acidification of the hydrolyzate. Add 0.3L of corncob hydrolyzate into a 0.5L continuous stirring reactor. The hydrolyzate is obtained from Shandong Longli Biotechnology Co., Ltd., and its main components are glucose (3.13 g / L), xylose (9.87 g / L), Arabic Sugar (2.51 g / L), xylooligosaccharide (3.72 g / L), furfural (1.9 g / L), add the inoculum according to the ratio of 0.5:1 between the inoculum and the volatile solids of the substrate, and the inoculum is double sedimentation pool sludge, and add 30 mg / L activated carbon, after stirring evenly, seal it and place it in a water bath heating device at 38°C. An air bag is connected to the reactor bottle stopper to balance the pressure of the reaction device. Stir once every 2 hours, sample and measure the concentration of organic acids and soluble COD in the fermented liquid every day, and obtain the fermented ...

Embodiment 2

[0037] Example 2: The similarities between this example and Example 1 will not be repeated. The difference is that the ratio of the inoculum to the substrate in the (1) acidification step of the hydrolyzed solution in Example 1 is changed to 1:1, The rest of the operations were the same, the concentration of organic acid in the final fermentation broth was 0.33 g / L, and no methane was produced in the process. The methanogenic process is the same as in Example 1 (2), the organic load is increased from 2 g COD / L to 8 g COD / L, the methane yield is 280-314 mL / g COD, and the methane content is 75.6-80.9% , COD removal rate is 85.0-94.9%.

Embodiment 3

[0038] Example 3: The similarities between this example and Example 1 will not be repeated, the difference is: the ratio of the inoculum to the substrate in the (1) acidification step of the hydrolyzed solution in Example 1 is changed to 2:1, The rest of the operations were the same, the concentration of organic acid in the final fermentation broth was 0.35 g / L, and no methane was produced in the process. The methanogenic process is the same as the steps in Example 1 (2), the organic load is increased from 2 gCOD / L to 8 gCOD / L, the methane yield is 282 - 318 mL / g COD, the methane content is 76.1-81.0%, and the COD The removal rate is 85.6-95.3%.

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Abstract

The invention relates to a method for preparing marsh gas through a lignocellulose hydrolysate. The method comprises the following steps of acid production, wherein the lignocellulose hydrolysate is added into a reaction bottle with a stirring function, then an inoculum secondary sedimentation tank sludge is added according to a certain proportion, activated carbon is added, the mixture is evenlystirred and closely placed in a water bath heating device, and an air bag is connected to a reactor bottle plug and used for balancing the pressure of a reaction device; stirring is conducted on timeevery day, after 3 days, an acid production reaction stage is ended, and a fermentation solution with rich organic acid is obtained; methane production, wherein a, anaerobic granular sludge is subjected to domestication; b, the obtained acid production fermentation solution is taken out, subjected to centrifugal solid-liquid separation and diluted to the proper load, the pH is adjusted, and then the solution enters a methane production reactor; by controlling the mass loading rate, the aim of adjusting the system load is achieved, so that the methane production process is normally conducted; remaining sludge can be used as the inoculum and continues to be used for an acid production reaction in the later period through the hydrolysate; a water outlet of the methane production reactor is used for adjusting the load of materials entering a UASB, and the water is returned to an adjustment tank for recycling.

Description

technical field [0001] The invention relates to a method for preparing biogas, in particular to a method for preparing biogas from lignocellulose hydrolyzate. Background technique [0002] With the shortage of traditional fossil energy and the increasing environmental pollution, the demand for clean fuels is increasing. As a renewable energy source, biogas has important economic and social benefits in both energy and environment. The development of biogas technology can not only treat organic waste such as livestock and poultry manure, straw, kitchen waste and organic wastewater, but also serve as biogas for residents' daily use. High-quality biogas for domestic or vehicle use. [0003] Hydrolyzate refers to the hydrolyzate obtained from lignocellulosic raw materials containing cellulose, hemicellulose and lignin after pretreatment (dilute acid hydrolysis is often used in industrial production), the main components are glucose, fructose, xylose and Arabinose, etc., are cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
CPCC12P5/023C12P2201/00C12P2203/00Y02E50/30
Inventor 李岩许海朋孟光范华栋梁牧辉金付强赵玉晓
Owner ENERGY RES INST OF SHANDONG ACAD OF SCI
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