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Methane fermenting method

A biogas fermentation and biogas technology, applied in fermentation, waste fuel, biosynthesis, etc., can solve the problems of accumulation, obvious inhibitory factors for a single material, long fermentation time, etc. The effect of decomposition and utilization promotion

Inactive Publication Date: 2012-10-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing biogas fermentation is often aimed at a single material, but the range of moisture content, pH, carbon-nitrogen ratio, etc. of a single material is very small, and it cannot be fully adapted to anaerobic fermentation to produce biogas, especially the anaerobic fermentation reaction product of a single material will produce methane feedback inhibition
For example, food waste has a low carbon-to-nitrogen ratio. Fermentation of food waste alone will easily lead to the accumulation of ammonia nitrogen. If the inhibitory concentration of ammonia nitrogen is exceeded, gas production will be inhibited. At the same time, sodium ions in food waste will also have a certain impact on gas production; Fermentation of feces also has a high concentration of ammonia nitrogen, which has an inhibitory effect on methanogenic bacteria; crop straw is rich in cellulose and lignin, and biogas fermentation is carried out alone, and cellulose, especially lignin, is difficult to decompose, so the fermentation time is longer and gas production low efficiency
If fermentation facilities are built separately for various wastes, the investment will be too large to form a scale, and the inhibitory factors of a single material are obvious, and it is difficult to adjust materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Biogas fermentation test

[0023] 1. Biogas fermentation raw materials

[0024] Biogas inoculum: sludge taken from Beijing sewage treatment plant;

[0025] Food waste: taken from the canteen of Beijing University of Chemical Technology, of which protein 15.14%, soluble sugar 33.38%, crude fat 25.24%, crude fiber 7.58% (mass percentage);

[0026] Sweet sorghum straw: taken from farmland in the suburbs of Beijing;

[0027] 2. Domestication of biogas inoculum

[0028] Initial acclimatization (7 days): Add glucose to the sludge to a concentration of 1g / L, the reactor operation cycle is 24h, the time allocation is 7h aeration, 3h static, and 14h idle. Replace 1 / 3 volume of supernatant with the initial sludge after each idle, and maintain the dissolved oxygen concentration at 2-3mg / L;

[0029] Mid-term domestication (5 days): Add glucose to the initial domesticated sludge to a concentration of 1g / L, and add 10% of the mass of the biogas inoculum after the initial domesticatio...

Embodiment 2

[0039] Example 2: Biogas fermentation test

[0040] 1. Biogas fermentation raw materials

[0041] Biogas inoculum: biogas residue taken from the biogas digester in Donghuashan Village, Shunyi District, Beijing;

[0042] Food waste: taken from the canteen of Beijing University of Chemical Technology, of which protein 15.14%, soluble sugar 33.38%, crude fat 25.24%, crude fiber 7.58% (mass percentage);

[0043] Corn stalks: taken from farmland in the suburbs of Beijing;

[0044] 2. Domestication of biogas inoculum

[0045] Initial acclimatization (7 days): Add glucose to the biogas residue to a concentration of 1g / L, the reactor operation cycle is 24h, and the time allocation is 7h aeration, 3h static, and 14h idle. Replace 1 / 3 volume of supernatant with the initial biogas residue after each idle, and maintain the dissolved oxygen concentration at 2-3mg / L;

[0046] Mid-term domestication (5 days): Add glucose to the biogas residue after the initial domestication to a concentration of 1g / L, ...

Embodiment 3

[0056] Example 3: Biogas fermentation test

[0057] 1. Biogas fermentation raw materials

[0058] Biogas inoculum: sewage taken from a food factory in Beijing;

[0059] Food waste: taken from the canteen of Beijing University of Chemical Technology, of which protein 15.14%, soluble sugar 33.38%, crude fat 25.24%, crude fiber 7.58% (mass percentage);

[0060] Wheat straw: taken from farmland in the suburbs of Beijing;

[0061] 2. Domestication of biogas inoculum

[0062] Initial acclimatization (7 days): Add glucose to the sewage to a concentration of 1g / L, the reactor operation cycle is 24h, the time is allocated as aeration for 7h, static sinking for 3h, and idle for 14h. Replace 1 / 3 of the supernatant with the initial sewage after each idle, and maintain the dissolved oxygen concentration at 2-3mg / L;

[0063] Mid-term domestication (5 days): Add glucose to the initial domesticated sewage to a concentration of 1g / L, and add food waste that accounts for 10% of the initial domesticated se...

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Abstract

The invention relates to the technical field of renewable energy and discloses a methane fermenting method. The method includes: domesticating methane inocula and subjecting the domesticated methane inocula, kitchen waste and dry straws to mixing and anaerobic fermentation, wherein the mass ratio of the kitchen waste on a total solid content basis to the dry straws is 1.5-7:1. By the aid of the reasonable ratio of the kitchen waste to the straws, pH (potential of hydrogen) does not need to be regulated by adding acid and base to balance the carbon-nitrogen ratio in a fermenting system, and the kitchen waste is efficiently used while part of cellulose crops difficult to be used can also be subjected to digestive treatment, so that the kitchen waste and the straws are mutually promoted. Besides, the methane fermenting method is simple in operation and low in cost and has valuable economic benefits.

Description

Technical field [0001] The invention relates to the technical field of renewable energy, in particular to a method for biogas fermentation. Background technique [0002] With the rapid development of our country’s economy, people’s living standards continue to rise, but with it, all kinds of garbage and waste are also increasing, such as industrial waste water, construction waste, kitchen waste, crop straw, human, livestock and poultry manure, etc. These wastes not only bring great pressure to the environment, but also increase the processing cost. But on the other hand, some wastes such as kitchen waste, crop straws, human, livestock, and poultry manure have high organic content, which can be treated with biological methods to achieve the purpose of collecting resources together and turning waste into treasure. , And anaerobic digestion technology is a commonly used biological treatment method. [0003] Anaerobic digestion refers to the process in which organic matter is decompo...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCY02E50/343Y02E50/30Y02P20/59
Inventor 张栩董玉林谭天伟
Owner BEIJING UNIV OF CHEM TECH
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