Method for improving anaerobic fermentation gas production performance by repeated freezing/thawing and potassium hydroxide compounded modification of corn stalks

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, obvious damage to the surface structure, and increasing biogas production

Active Publication Date: 2018-09-04
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
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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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  • Method for improving anaerobic fermentation gas production performance by repeated freezing/thawing and potassium hydroxide compounded modification of corn stalks
  • Method for improving anaerobic fermentation gas production performance by repeated freezing/thawing and potassium hydroxide compounded modification of corn stalks
  • Method for improving anaerobic fermentation gas production performance by repeated freezing/thawing and potassium hydroxide compounded modification of corn stalks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0027] After the pretreatment, 150 g of anaerobic digester sludge (calculated as MLSS) from a sewage treatment plant in normal operation was added as an inoculum and mixed for anaerobic digestion for 40 days. Meanwhile, the untreated group was set up for anaerobic digestion. Record the daily biogas production by drainage method, measure the percentage of methane every day, calculate the total methane production, and then calculate T 80 . The experimental results are as follows:

[0028] Table 1 Anaerobic dig...

Embodiment 2

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

[0035] After the pretreatment, 150 g of anaerobic digester sludge (calculated as MLSS) from a sewage treatment plant in normal operation was added as an inoculum and mixed for anaerobic digestion for 40 days. At the same time, the untreated group was set for anaerobic digestion. The daily biogas production is recorded by the drainage method, the percentage of methane is measured ev...

Embodiment 3

[0040] Weigh 15 parts of corn stalk materials, each raw material has a mass of 38.48g (in terms of dry matter), and add it to the self-sealing Mix well in the bag, and place it at -22°C and 21°C and -41°C and 21°C for freeze-thaw pretreatment for 5 days. treatment group.

[0041] After the pretreatment, 150 g of anaerobic digester sludge (calculated as MLSS) from a sewage treatment plant in normal operation was added as an inoculum and mixed for anaerobic digestion for 40 days. At the same time, 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, the total methane production was calculated, and each pretreatment group was compared. The experimental results are as follows:

[0042] Table 3 Biogas production effect of anaerobic digestion

[0043]

[0044] The above temperature 21 and -22 refer to stable storage at 21°C and -22°C for 4 days respectively, -22+...

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Abstract

Belonging to the field of renewable energy sources, the invention relates to a method for improving the anaerobic fermentation gas production performance by repeated freezing / thawing and potassium hydroxide compounded modification of corn stalks. The method includes the steps of: loading corn stalks into a self-sealing bag, then adding tap water with different solid-liquid ratios (1:5-1:15) and KOH alkaline reagents of different concentrations (2%-6%), and then putting the self-sealing bag into a cabinet freezer at a temperature ranging from -22DEG C to -41DEG C for freezing, and conducting thawing in a 21DEG C thermotank, specifically, after every 12h of freezing, taking the self-sealing bag out for thawing for 12h, and conducting cyclic freezing / thawing for 2-7d; and subjecting the pretreated materials to intermediate temperature anaerobic fermentation. Compared with the prior art, the method provided by the invention has the following beneficial effects that: (1) the pretreatment effect is obviously enhanced; (2) the anaerobic fermentation cycle T80 is obviously shortened (28.1%-40.6%); and (3) the biogas yield and the methane yield are significantly increased (30.1%-45.9%, 40.7%-54.9%).

Description

technical field [0001] The invention belongs to the field of biomass waste treatment and renewable energy, and specifically relates to a method for improving its gas production performance by using corn stalks for anaerobic digestion, and in particular to a compound modification by repeated freezing / thawing and potassium hydroxide A method for improving the gas production performance of corn stalks by anaerobic fermentation. Background technique [0002] Crop straw is a particularly abundant and cheap biomass renewable resource. The annual output of crop straw in my country reaches more than 800 million tons, of which the output of corn straw reaches 284 million tons. Most of the corn stalks are burned in open air or stacked in the field because they cannot be used effectively in a timely manner, which seriously pollutes the atmospheric environment and wastes resources. Anaerobic digestion technology has been proven to be an important method to effectively obtain biomass en...

Claims

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Application Information

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Patent Type & Authority Applications(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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