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Method for producing biogas by enhancing kitchen waste anaerobic fermentation

A technology of kitchen waste and anaerobic fermentation, applied in the directions of fermentation, waste fuel, etc., can solve the problems of reducing the efficiency and economic benefits of anaerobic digestion system, restricting the development of kitchen waste biogas projects, and difficult to operate stably, avoiding trace Insufficient iron, the effect of promoting activity and increasing gas production

Inactive Publication Date: 2016-05-04
QINGDAO TIANREN ENVIRONMENT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a method for improving the anaerobic fermentation of kitchen waste to produce biogas, which solves the phenomenon of anaerobic acidification of the fermentation system due to the large accumulation of VFA in the anaerobic system of kitchen waste in the prior art, which causes low organic load, low Problems such as difficulty in stable operation under high organic loads further reduce the efficiency and economic benefits of the anaerobic digestion system and restrict the development of food waste biogas projects to a certain extent

Method used

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  • Method for producing biogas by enhancing kitchen waste anaerobic fermentation

Examples

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Embodiment 1

[0018] A method for improving the anaerobic fermentation of kitchen waste to produce biogas, comprising the following steps:

[0019] (1) Weigh the kitchen waste to control the concentration of volatile solids at 15%.

[0020] (2) Weigh the inoculum so that the concentration of volatile solids is controlled at 1.5%.

[0021] (3) Mix the above-mentioned food waste with the above-mentioned inoculum, stir evenly to form a fermentation system, add it into a fermentation bottle, and control the concentration of total volatile solids in the fermentation system at 3%.

[0022] (4) Weigh the water-soluble ferrous salt, add water, and prepare a solution with a ferrous ion concentration of 1000 mg / L.

[0023] (5) Add the ferrous ion solution prepared above into the fermentation bottle in step (3) according to the addition amount of 1 mg per liter.

[0024] (6) Put the fermentation bottle in step (5) in a water bath, ferment at medium temperature (35°C) for 32 days, and collect biogas....

Embodiment 2

[0027] A method for improving the anaerobic fermentation of kitchen waste to produce biogas, comprising the following steps:

[0028] (1) Weigh the kitchen waste to control the concentration of volatile solids at 15%.

[0029] (2) Weigh the inoculum so that the concentration of volatile solids is controlled at 1.5%.

[0030] (3) Mix the above-mentioned food waste with the above-mentioned inoculum, stir evenly to form a fermentation system, add it into a fermentation bottle, and control the concentration of total volatile solids in the fermentation system at 3%.

[0031] (4) Weigh the water-soluble ferrous salt, add water, and prepare a solution with a ferrous ion concentration of 1000 mg / L.

[0032] (5) Add the ferrous ion solution prepared above into the fermentation bottle in step (3) according to the addition amount of 5 mg per liter.

[0033] (6) Put the fermentation bottle in step (5) in a water bath, ferment at medium temperature (35°C) for 32 days, and collect biogas....

Embodiment 3

[0036] A method for improving the anaerobic fermentation of kitchen waste to produce biogas, comprising the following steps:

[0037] (1) Weigh the kitchen waste to control the concentration of volatile solids at 15%.

[0038] (2) Weigh the inoculum so that the concentration of volatile solids is controlled at 1.5%.

[0039] (3) Mix the above-mentioned food waste with the above-mentioned inoculum, stir evenly to form a fermentation system, add it into a fermentation bottle, and control the concentration of total volatile solids in the fermentation system at 3%.

[0040] (4) Weigh the water-soluble ferrous salt, add water, and prepare a solution with a ferrous ion concentration of 1000 mg / L.

[0041] (5) Add the ferrous ion solution prepared above into the fermentation bottle in step (3) according to the addition amount of 10 mg per liter.

[0042] (6) Put the fermentation bottle in step (5) in a water bath, ferment at medium temperature (35°C) for 32 days, and collect biogas...

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Abstract

The invention discloses a method for producing biogas by enhancing kitchen waste anaerobic fermentation, belonging to the technical fields of organic matter solid waste treatment and biomass new energies. The method comprises the following steps: (1) taking kitchen waste; (2) taking inocula; (3) mixing the kitchen waste and inocula, stirring uniformly, and adding the mixture into a fermentation reactor, wherein the solid concentration is 1.5-4%; (4) taking a ferrous salt, and preparing a 1.00-6.36 g / L solution; (5) adding the ferrous solution prepared in the step (4) into the fermentation reactor in the step (3) according to the addition amount of 1-250 mg / L; and (6) putting the fermentation reactor in the step (5) under moderate temperature conditions, fermenting, and collecting the biogas. The ferrous ions with proper concentration are added into the kitchen waste fermentation system, thereby effectively enhancing the activity of methane bacteria, increasing the organic matter degradation rate, increasing the biogas production rate, shortening the fermentation time and enhancing the economic benefit.

Description

technical field [0001] The invention belongs to the technical field of organic solid waste treatment and biomass new energy, in particular to a method for improving the anaerobic fermentation of kitchen waste to produce biogas. Background technique [0002] The main components of food waste are rice, noodles, meat, fruits and vegetables, and oily substances. In terms of their chemical composition, food waste is mainly carbohydrates, proteins, lipids, inorganic salts, and water; thus It can be seen that there are more easily hydrolyzed organic substances in food waste, and the gas production potential of anaerobic fermentation is high; therefore, the use of anaerobic digestion technology to treat food waste is an effective way to achieve harmlessness and resource utilization. [0003] However, due to the high content of organic matter in food waste, which is easy to degrade, the volatile organic acids (VFA) produced in the hydrolysis stage of anaerobic fermentation cannot be ...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCC12P5/023Y02E50/30
Inventor 吴健敏吕晓东
Owner QINGDAO TIANREN ENVIRONMENT
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