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Method for generating marsh gas through adopting peat subjected to ultrasonication as raw material

An ultrasonic and biogas production technology, applied in the direction of waste fuel, fermentation, etc., can solve the problems of unresolved biogas, restriction of peat comprehensive utilization and high-value utilization, etc., to shorten the time, promote anaerobic conversion of peat into biogas, and increase production The effect of gas rate

Inactive Publication Date: 2013-10-16
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former is a mixture of peat and lignocellulosic raw materials, and the latter is a mixture of peat and pig manure, neither of which solves the problem of anaerobic fermentation of peat as raw material to prepare biogas, which limits the comprehensive utilization and high-value utilization of peat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take natural air-dried peat and crush it and sieve it, collect 20g of peat 40 mesh fine powder, add calcium chloride solution with a mass percentage of 150% and a concentration of 10% by mass, start the ultrasonic device, the ultrasonic frequency is 25KHz, the power is 300W, and the treatment is 45min at 50°C , add activated sludge with a mass fraction of 60%, add water to adjust the solid-to-liquid ratio to 1:12, add sodium hydroxide solution to adjust the pH to 7.0, and anaerobically ferment at 28°C for 45 days. During the fermentation process, the fermentation device was stirred and oscillated 4 times a day, and 680ml of biogas was collected by the drainage and gas collection method. The average methane content in the biogas was 54% as determined by gas chromatography.

Embodiment 2

[0021] Take natural air-dried peat, crush it and sieve it, collect 100 mesh fine powder of peat, 10g, add water with a mass fraction of 140%, start the ultrasonic device, ultrasonic frequency 20KHz, power 150W, treat at 30°C for 25min, add active sewage with a mass fraction of 50% mud, add water to adjust the solid-to-liquid ratio of 1:10, add sodium hydroxide solution to adjust the pH to 7.5, and anaerobically ferment at 50°C for 20 days. During the fermentation process, the fermentation device was stirred and oscillated 4 times a day, and 240ml of biogas was collected by the saturated salt water drainage and gas collection method. The average methane content in the biogas was determined to be 58% by gas chromatography.

Embodiment 3

[0023] Take natural air-dried peat and crush it and sieve it, collect 10g of peat 50 mesh fine powder, add a magnesium acetate solution with a mass fraction of 70% and a mass percentage concentration of 5%, start the ultrasonic device, the ultrasonic frequency is 30KHz, the power is 200W, and the treatment is at 30°C for 15 minutes. Add activated sludge with a mass fraction of 60%, add water to adjust the solid-to-liquid ratio to 1:15, add sodium hydroxide solution to adjust the pH to 7.0, and perform anaerobic fermentation at 32°C for 30 days. During the fermentation process, the fermentation device was stirred and oscillated 4 times a day, and 380ml of biogas was collected by the saturated salt water drainage and gas collection method. The average methane content in the biogas was determined to be 56% by gas chromatography.

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Abstract

The invention discloses a method for generating marsh gas through adopting peat subjected to ultrasonication as raw material. The method is realized in the manner that peat taken as the only raw material is crushed and subjected to ultrasonication, activated sludge is added for marsh gas fermentation, and the content of methane in marsh gas reaches 50-69%. The method has the following benefits: the mechanical function and cavatition of ultrasonic waves change the inner microstructure of peat, damage organic matters to facilitate the anaerobic fermentation of peat, so as to improve the gas output and gas production rate in peat fermentation, and shorten the time in reaching the maximum gas output at the same time; energy contained in organic matters of peat is released at a lower temperature and within a shorter time through ultrasonication, and is converted into marsh gas, so that peat taking as the raw material can be used for preparing marsh gas through anaerobic fermentation, and a new approach to comprehensive utilization of peat rich in reserve is created.

Description

[0001] technical field [0002] The invention relates to a method for producing biogas by ultrasonically treating peat raw materials, belonging to the application field of peat resources. Background technique [0003] Coal is the energy resource with the widest distribution and large reserves in my country, and occupies a major position in my country's energy consumption structure. Coal can be divided into peat, lignite, bituminous coal and anthracite according to the degree of coalification. Peat, also known as peat or peat, is the coal with the lowest degree of coalification. It is formed by long-term accumulation of swamp plant residues that cannot be fully decomposed under the conditions of excessive water, poor ventilation, and low temperature. A kind of organic matter that is not easy to decompose and has stable properties and accumulates in layers. [0004] The composition of peat is complex, in addition to containing a large amount of water, it also includes organi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
CPCY02E50/343Y02E50/30
Inventor 李珺马力通张永强
Owner INNER MONGOLIA UNIV OF SCI & TECH