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Method for increasing methane production efficiency in organic waste anaerobic process

A technology for organic waste and methane, applied in the field of resource utilization, can solve the problems of low efficiency, slow methane speed, high price, etc., and achieve the effects of abundant natural resources, promotion of hydrolysis, and improvement of efficiency

Active Publication Date: 2011-08-03
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
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Effect test

Embodiment 1

[0025] In the anaerobic digestion bottle of 1000mL, add 20g medium (which contains 5g beef extract, 10g protein jelly and 5g sodium chloride, then add 0.102g industrial pure iron sesquioxide powder (Fe 2 o 3 98% by mass, containing Fe 2 o 3 0.1g, and the mass ratio of the medium is 0.5%), inoculate 5mL of mixed anaerobic bacteria (bacteria concentration 10 10 per mL), mix well and seal. Take the gas above the anaerobic digestion bottle regularly and measure the content of hydrogen sulfide, carbon dioxide and methane in the gas.

[0026] In this embodiment, the methane production rate is shown in figure 1 Middle curve a.

Embodiment 2

[0028] Add 20g medium (which contains 5g beef extract, 10g protein jelly and 5g sodium chloride) into the anaerobic digestion bottle of 1000mL, then inoculate 5mL of mixed anaerobic bacteria (bacteria concentration 10 10 per mL), mix well and seal. Take the gas above the anaerobic digestion bottle regularly and measure the content of hydrogen sulfide, carbon dioxide and methane in the gas.

[0029] In this embodiment, the methane production rate is shown in figure 1 Middle curve b.

[0030] by pair figure 1 The comparative analysis of the curves a and b in the middle shows that the addition of Fe 2 o 3 The methane production rate (curve a) in the anaerobic digestion flask of mineral powder is much higher than that without Fe addition 2 o 3 Methane production rate of ore powder (curve b).

Embodiment 3

[0032] Limonite ore is crushed through a 200-mesh sieve to obtain limonite powder, in which free Fe 2 o 3 The mass percentage is 68%. Put 300g of pig manure into a 1000mL anaerobic digestion bottle, 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 of mixed anaerobic bacteria liquid (bacteria concentration 10 10 per mL), mix well and seal. Take the gas above the anaerobic digestion bottle regularly and measure the methane content in the gas.

[0033] In this embodiment, the output rate of methane 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 the methane output efficiency in the anaerobic process of organic wastes. 2. Background technology [0002] my country produces billions of tons of various biodegradable organic wastes every year, mainly including straw materials, intensive farm fecal waste, agricultural and forestry product processing waste, fruit and vegetable waste, urban domestic waste, and urban sewage treatment plants sludge. These organic wastes are partially converted into renewable energy by generating biogas in an anaerobic environment. As global change intensifies, renewable energy is in the global spotlight. Anaerobic digestion of biodegradable organic wastes produces methane, which can not only properly treat and dispose of organic wastes, but also obtain renewable energy and realize the resource utilization of orga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C12M1/107
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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