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Method for increasing methane production efficiency in organic waste anaerobic process

A technology of organic waste and methane, applied in the field of resource utilization, can solve problems such as low efficiency, high price, and slow methane speed, and achieve the effect of abundant natural resources, low price, and promoting hydrolysis

Active Publication Date: 2015-03-25
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the common problems are the slow rate of anaerobic digestion of organic waste to produce methane, long treatment cycle and low efficiency.
However, the above-mentioned additives are artificially synthesized compounds, which are not only expensive, but also belong to soluble salts, which will be decomposed and converted into metal ions when added to the digestive system, and the concentration of metal ions fluctuates greatly, affecting the stability of biochemical systems

Method used

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  • Method for increasing methane production efficiency in organic waste anaerobic process
  • Method for increasing methane production efficiency in organic waste anaerobic process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 20g of medium (which contains 5g beef extract, 10g protein jelly and 5g sodium chloride to the 1000mL anaerobic digestion flask, and then add 0.102g industrial pure iron trioxide powder (Fe 2 O 3 98% by mass, containing Fe 2 O 3 0.1g, and the mass ratio of the culture medium is 0.5%), inoculate 5mL mixed anaerobic bacteria (bacteria concentration 10 10 Pieces / mL), mix well and seal. Regularly take the gas above the anaerobic digestion flask and measure the content of hydrogen sulfide, carbon dioxide and methane in the gas.

[0026] The methane production rate in this example is shown in figure 1 Middle curve a.

Embodiment 2

[0028] Add 20g of culture medium (containing 5g beef extract, 10g protein jelly and 5g sodium chloride) to a 1000mL anaerobic digestion flask, and then inoculate 5mL mixed anaerobic bacteria (bacteria concentration 10 10 Pieces / mL), mix well and seal. Regularly take the gas above the anaerobic digestion flask and measure the content of hydrogen sulfide, carbon dioxide and methane in the gas.

[0029] The methane production rate in this example is shown in figure 1 Middle curve b.

[0030] By right figure 1 The comparative analysis of middle curve a and b shows that adding Fe 2 O 3 The methane production rate in the anaerobic digestion flask of mineral powder (curve a) is much higher than that without Fe 2 O 3 The methane production rate of ore fines (curve b).

Embodiment 3

[0032] The limonite ore is crushed through a 200-mesh sieve to obtain limonite powder, of which free Fe 2 O 3 The mass percentage is 68%. Put 300g of pig manure into a 1000mL anaerobic digestion flask, add 2.21g of limonite powder (containing Fe 2 O 3 1.5g, and the mass ratio of organic waste is 0.5%), and inoculate 5mL mixed anaerobic bacteria solution (bacteria concentration 10 10 Pieces / mL), mix well and seal. Regularly take the gas above the anaerobic digestion flask and measure the methane content in the gas.

[0033] The methane production rate in this example is shown in figure 2 Middle curve c.

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Abstract

The invention discloses a method for increasing methane production efficiency in organic waste anaerobic process. The method is characterized in that powder containing no less than 15% of free ferric iron oxides is added into an anaerobic biochemical system to be uniformly blended, wherein the anaerobic biochemical system produces methane by utilizing organic wastes; and ferric ions released when microbes reduce the ferric iron oxides in the anaerobic process can promote the activity of anaerobic bacteria such as methane bacteria and the like, thus increasing the production rate and yield of methane by utilizing organic wastes. The method can be widely used for increasing the methane production rate and yield of an energy utilization system for biogas production of municipal domestic waste, agriculture product processing wastes, excess sludge of sewage treatment plants, feces of intensifying raising farms and the like and improves the utilization rate of renewable energy sources of organic wastes.

Description

1. Technical Field [0001] The invention relates to the renewable energy utilization of organic wastes and the resource utilization of wastes, in particular to a method for improving methane production efficiency in the anaerobic process of organic wastes. 2. Background technology [0002] my country produces billions of tons of various biodegradable organic wastes each year, mainly including straw materials, intensive farm manure waste, agricultural and forestry product processing waste, fruit and vegetable waste, urban domestic waste, and urban sewage treatment plants sludge. These organic wastes produce biogas in an anaerobic environment and are partially converted into renewable energy. As global changes intensify, renewable energy has become the focus of global attention. The anaerobic digestion of biodegradable organic waste produces methane, which can not only properly treat and dispose of organic waste, but also obtain renewable energy and realize the resource utilization...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12M1/107C02F11/04
CPCY02E50/343Y02E50/30Y02W10/20
Inventor 陈天虎何光亚姚墩璠杨燕
Owner HEFEI UNIV OF TECH
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