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A method of repeatedly freezing/thawing and potassium hydroxide compound modified corn straw to improve the gas production performance of anaerobic fermentation

A technology of corn stalks and potassium hydroxide, which is applied in fermentation, biosynthesis, waste fuel, etc., can solve problems that have not been considered, and achieve the effects of saving operating costs, improving gas production performance, and increasing biogas output

Active Publication Date: 2022-03-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above studies only considered one temperature and did not take into account the influence of variable temperature and compound modification on the pretreatment effect of biomass raw materials.

Method used

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  • A method of repeatedly freezing/thawing and potassium hydroxide compound modified corn straw to improve the gas production performance of anaerobic fermentation
  • A method of repeatedly freezing/thawing and potassium hydroxide compound modified corn straw to improve the gas production performance of anaerobic fermentation
  • A method of repeatedly freezing/thawing and potassium hydroxide compound modified corn straw to improve the gas production performance of anaerobic fermentation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Taking 9 parts of corn stover material with a weight of 38.48g (in terms of dry matter), a single-factor pretreatment experiment was designed using the solid-liquid ratio (1:5, 1:10 and 1:15 tap water) factors. The above 12 raw materials were sealed at -22°C and 21°C for freeze-thaw pretreatment for 5 days, wherein the raw materials were taken out after every 12 hours and thawed at room temperature for 12 hours, and rubbed once every 3 hours during the thawing process.

[0027] After the pretreatment, 150 g of anaerobic digester sludge (calculated by MLSS) of the normal operation sewage treatment plant was added as the inoculum and mixed to carry out anaerobic digestion reaction for 40 days. Meanwhile, the untreated group was set for anaerobic digestion. The daily biogas production is recorded by the drainage method, the percentage of methane is measured every day, the total methane production is calculated, and then T is calculated. 80 . The experimental results are ...

Embodiment 2

[0034]Take 18 parts of corn stalk material with a weight of 38.48g (calculated by dry matter), add it into a ziplock bag according to a fixed solid-liquid ratio (1:10) and mix it evenly, and design a single factor pretreatment with a factor of cycle times (2-7 times). experiment. The above 18 raw materials were sealed and frozen at -22°C and thawed at 21°C for cyclic freezing and thawing. Each group of 3, a total of 6 groups, were pretreated for 2-7 days in a cycle, and each group was every 12h. Then take out the raw materials and thaw at room temperature for 12 hours, and knead it every 3 hours during the thawing process.

[0035] After the pretreatment, 150 g of anaerobic digester sludge (calculated by MLSS) of the normal operation sewage treatment plant was added as the inoculum and mixed to carry out anaerobic digestion reaction for 40 days. Meanwhile, the untreated group was set for anaerobic digestion. The daily biogas production was recorded by the drainage method, th...

Embodiment 3

[0040] Weigh 15 parts of corn stalk materials, each with a mass of 38.48g (in terms of dry matter), and add it to the self-sealing according to the fixed solid-liquid ratio (1:10) and the fixed KOH reagent mass percentage (0%, 6%). Mix evenly in the bag, freeze and thaw for 5 days at -22°C and 21°C, and -41°C and 21°C for pretreatment. processing group.

[0041] After the pretreatment, 150 g of anaerobic digester sludge (calculated by MLSS) of the normal operation sewage treatment plant was added as the inoculum and mixed to carry out anaerobic digestion reaction for 40 days. Meanwhile, the untreated group was set for anaerobic digestion. The daily biogas production was recorded by the drainage method, the percentage of methane was measured every day, and the total methane production was calculated, and the pretreatment groups were compared. The experimental results are as follows:

[0042] Table 3 The effect of anaerobic digestion to produce biogas

[0043]

[0044] Th...

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Abstract

The invention relates to a method for improving the gas production performance of anaerobic fermentation by compound-modifying corn stalks with repeated freezing / thawing and potassium hydroxide, belonging to the field of renewable energy. The invention comprises the following steps: putting the corn stalk material into a ziplock bag, adding tap water with different solid-liquid ratios (1:5-1:15) and KOH alkaline reagents with different concentrations (2%-6%), and then Put it in a ‑22°C to ‑41°C freezer to freeze and thaw in a 21°C incubator. Among them, after every 12 hours of freezing, take it out and thaw for 12 hours, and cycle the freeze-thaw cycle for 2‑7 days; put the pretreated material at medium temperature Anaerobic fermentation. Compared with the prior art, the present invention has the following beneficial effects (1) the pretreatment effect is significantly enhanced; (2) the anaerobic fermentation cycle T 80 significantly shortened (28.1%-40.6%); (3) biogas production and methane production increased significantly (30.1%-45.9%, 40.7%-54.9%).

Description

technical field [0001] The invention belongs to the field of biomass waste treatment, namely renewable energy, and in particular relates to a method for utilizing corn stalk raw material for anaerobic digestion to improve its gas production performance, in particular to a compound modification by repeated freezing / thawing and potassium hydroxide A method for improving the gas production performance of anaerobic fermentation of corn stover. Background technique [0002] Crop straw is a particularly abundant and low-cost biomass renewable resource. The annual output of crop straw in my country is more than 800 million tons, of which the output of corn straw is 284 million tons. Because it cannot be used effectively in time, most of the corn stalks are burned in the open air or piled up in the wild, which seriously pollutes the atmospheric environment and wastes resources at the same time. Anaerobic digestion technology has been proven to be an important method for effectively...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02
CPCC12P5/023C12P2203/00C12P2201/00Y02P20/59Y02E50/30
Inventor 李秀金李娟袁海荣
Owner BEIJING UNIV OF CHEM TECH
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