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Method for producing methane from kitchen waste by two continuous anaerobic fermentation steps

A technology for kitchen waste and anaerobic fermentation, which is applied in biochemical equipment and methods, bioreactors for gas production, biochemical instruments, etc., can solve the problem that the two-phase anaerobic fermentation process is difficult to operate continuously, and the acidification and hydrolysis of kitchen waste produces biogas. Low efficiency and other problems, to achieve the effects of reducing operating costs, high methane production rate, and improving degradation efficiency and biogas production efficiency

Inactive Publication Date: 2012-10-31
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for two-step continuous anaerobic fermentation of food waste to produce biogas, so as to overcome the problems existing in the existing anaerobic digestion treatment technology of food waste, especially the two-phase anaerobic fermentation process that is difficult to continue Operation, food waste acidification hydrolysis and low efficiency of biogas production

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  • Method for producing methane from kitchen waste by two continuous anaerobic fermentation steps
  • Method for producing methane from kitchen waste by two continuous anaerobic fermentation steps
  • Method for producing methane from kitchen waste by two continuous anaerobic fermentation steps

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Embodiment 1

[0033] The kitchen waste was taken from Qingdao Fengfeng Ecological Food Garden, and large solid inorganic substances such as chopsticks, shells, and plastics were removed, and then crushed and beaten with a food beater 1. The composition and solid content of the kitchen waste after beating were measured as shown in Table 1 and shown in Table 2. Mix and dilute the pulped food waste and water through the dilution device 2, and the solid content of the food waste after dilution is 75gVS / L. The anaerobic digestion sludge of the inoculum was taken from Qingdao Tuandao Sewage Treatment Plant, concentrated by centrifugation, and the solid content of the concentrated inoculum was measured (see Table 2).

[0034] Table 1 Composition of food waste elements

[0035]

[0036] Table 2 Solid content of food waste and inoculum

[0037]

[0038] Add the diluted food waste to the first CSTR fermenter 3, the volume of the fermenter is 5L, first add 4.5L of food waste, blow with nitroge...

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Abstract

The invention discloses a method for producing methane from kitchen waste by two continuous anaerobic fermentation steps. The method comprises the following steps: 1) crushing and beating the kitchen waste; 2) adding water into the beaten kitchen waste, and transferring the kitchen waste added with the water to a first continuous stirred tank reactor (CSTR) anaerobic fermentation tank for acidification hydrolization; and 3) transferring the fermented materials subjected to the acidification hydrolization to a second CSTR anaerobic fermentation tank for anaerobic fermentation to produce methane, wherein an anaerobic inoculum is adopted. According to the method, the kitchen waste is subjected to the acidification hydrolization at first and then is subjected to the high-temperature anaerobic fermentation to generate the methane by adopting a continuous operation way in the two anaerobic digestion processes; and the fermented materials subjected to the acidification hydrolization does not need to be subjected to solid-liquid separation, so that the problems that the kitchen waste is fast to degrade and the production of the methane is not stable in the anaerobic fermentation process are solved, and the industrial anaerobic digestion treatment of the kitchen waste can be implemented.

Description

technical field [0001] The invention belongs to the field of solid waste treatment and resource utilization, and more specifically relates to a high-temperature two-step continuous anaerobic fermentation method for producing biogas from kitchen waste, so as to solve the problem of low biogas production efficiency from kitchen waste. Background technique [0002] Kitchen waste is the domestic waste formed by residents in the process of living consumption. 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. Because of its rich organic content, high moisture content, and perishability, its properties and odor will have a bad impact on environmental hygiene, and it is easy to breed harmful substances such as pathogenic microorganisms and mycotoxins. China has a large output of food waste. According to f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12M1/107
CPCY02E50/343C12M47/18C12M21/04C12M45/06C12M23/56Y02E50/30
Inventor 郭荣波孟宪武许晓辉杨智满罗生军戴萌
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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