Method for producing hydrogen and methane through continuous solid state fermentation of kitchen garbage

A technology for food waste and hydrogen production, which is applied in the field of waste resource utilization, can solve problems such as difficulty in ensuring the speed of fermentation, and achieve the effects of optimizing production environment conditions, eliminating pollution control, and increasing efficiency

Inactive Publication Date: 2011-08-31
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

At the same time, the necessary pretreatment is also crucial to the speed of fermentat

Method used

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  • Method for producing hydrogen and methane through continuous solid state fermentation of kitchen garbage

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[0015] Example 1

[0016] For the food waste collected from the canteen of a university in Beijing, the food waste 1 collected by the high-speed centrifuge 9 is first used to reduce the moisture content of the food waste 1 to 45% (w / w). Then, a 500L steam explosion tank 10 is used to perform steam explosion treatment on the dehydrated food waste 3, the steam explosion conditions are: the steam pressure is 1.20 MPa, and the steam explosion pressure maintenance time is 180 seconds. The liquefaction phenomenon of food waste after steam explosion treatment is obvious, and the starch and cellulose raw materials in the food waste are obviously degraded, which is very beneficial to the subsequent anaerobic fermentation. The food waste 4 after steam explosion treatment is mixed with the sludge of the municipal sewage treatment plant in a ratio of 1:0.2 (weight ratio) and then sent to the continuous solid fermentation reaction tower 13 for anaerobic fermentation, and the material is fed f...

Example Embodiment

[0017] Example 2

[0018] For the food waste collected from the canteen of a university in Beijing, the food waste 1 collected by the high-speed centrifuge 9 is first used to reduce the moisture content of the food waste 1 to 40% (w / w). Then, a 1000L steam explosion tank 10 is used to perform steam explosion treatment on the dehydrated food waste 3, and the steam explosion conditions are: the steam pressure is 2 MPa, and the steam explosion pressure maintenance time is 60 seconds. The liquefaction phenomenon of food waste after steam explosion treatment is obvious, and the starch and cellulose raw materials in the food waste are obviously degraded, which is very beneficial to the subsequent anaerobic fermentation. The food waste 4 after steam explosion treatment is mixed with the sludge of the municipal sewage treatment plant in a ratio of 1:0.1 (weight ratio) and then sent to the continuous solid fermentation reaction tower 13 for anaerobic fermentation, and the material is fed ...

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Abstract

The invention discloses a method for producing hydrogen and methane through continuous solid state fermentation of kitchen garbage, which comprises the following steps of: (1) dewatering kitchen garbage; (2) performing steam explosion; (3) mixing sludge and initiating continuous solid state fermentation; (4) separately feeding the kitchen garbage after fermentation is initiated, and simultaneously inoculating newly fed kitchen garbage subjected to steam explosion with bottom fermentation residue on the top; (5) agitating the materials by using circulating wind in the fermentation process; (6) automatically extracting and separating the materials when the gas pressure is higher than 0.1 MPa; and (7) further drying the fermented residue to be used as an organic fertilizer. The invention has the advantages of treating the kitchen garbage through steam explosion, increasing the degradation rate of the raw materials, producing hydrogen and methane through solid state fermentation, avoiding subsequent waste water treatment and improving efficiency by using the continuous fermentation process.

Description

technical field [0001] The invention belongs to waste resource utilization technology, in particular to a method for producing hydrogen and methane by continuous solid-state fermentation of kitchen waste. Background technique [0002] Food waste refers to the food waste generated in the daily life of residents and food processing. The sources are mainly concentrated in hotels, food factories, schools, governments, scientific research institutions, etc., and are an important part of urban domestic waste. The main components of food waste include rice and flour food residues, vegetables, animal and vegetable oils, meat and bones, etc. From the chemical composition, there are starch, cellulose, protein, lipids and inorganic salts. [0003] In recent years, with the improvement of the living standards of urban people in our country, the amount of food waste generated has increased rapidly. Statistics from the Institute of Solid Waste Pollution Control and Recycling of the Envir...

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Application Information

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IPC IPC(8): C12P3/00C12P5/02
CPCY02E50/343Y02E50/30
Inventor 陈洪章李宏强
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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