Improved method and system for producing methane by using two-phase anaerobic digestion process

An anaerobic digestion and methane technology, applied in biochemical equipment and methods, gas production bioreactors, specific-purpose bioreactors/fermenters, etc., can solve the problem of reducing reaction efficiency, threats to surrounding environment safety, and reducing system energy Recovery efficiency and other issues, to achieve the effect of improving methane recovery rate, improving energy recovery efficiency, and reducing loss

Active Publication Date: 2017-01-04
HONG KONG BAPTIST UNIV
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AI Technical Summary

Problems solved by technology

The hydrolysis and acidification reaction of organic solids in the acidification reactor will produce a large amount of hydrogen and carbon dioxide. System material conservation analysis shows that this part of gas can account for 22-30% of the digested substrate; under traditional operating conditions, these gases will be It is released with the opening of the reactor, which not only reduces the energy recovery efficiency of the system, but also poses a potential threat to the safety of the surrounding environment; a large amount of hydrogen in the headspace of the acidification reactor will inhibit the hydrolysis / acidification reaction and reduce the reaction efficiency
However, there is no research report on improving the efficiency of hydrolysis / acidification by adjusting the pressure of the headspace of the acidification reactor to realize the reuse of gas in the acidification reactor, and finally improve the efficiency of methane recovery in two-phase anaerobic digestion.

Method used

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  • Improved method and system for producing methane by using two-phase anaerobic digestion process
  • Improved method and system for producing methane by using two-phase anaerobic digestion process
  • Improved method and system for producing methane by using two-phase anaerobic digestion process

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Embodiment 1

[0061] See attached figure 1 : Before the start of the experiment, the sludge in the methanation reactor was domesticated with artificially prepared glucose wastewater; at the same time, hydrogen was passed into the reactor at a rate of 3.2 liters of hydrogen per liter of reactor per day to enhance the activity of hydrogen-type methanogens , when the content of methane in the generated biogas is stable at about 85% (fluctuation is less than 5%) and the COD removal rate of the effluent reaches 85-95%, the domestication is over and it will be used; in order to better understand the acidification reaction under the design conditions To determine the effects of headspace pressure control and non-control on methane production and COD, this experiment set up a traditional acidification reactor coupled with a methanation reactor without regulating the headspace pressure of the hydrolysis phase as a control. The acidification reactor is a percolation bed reactor with a working volume ...

Embodiment 2

[0070] Before the start of the experiment, the sludge in the methanation reactor was domesticated with artificially prepared glucose wastewater and hydrogen; at the same time, hydrogen was passed into the reactor at a rate of 3.2 liters of hydrogen per liter of reactor per day to strengthen the growth of hydrogen-type methanogens. Activity, when the methane content in the generated biogas is stable at about 85% (fluctuation is less than 5%) and the COD removal rate of the effluent reaches 85-95%, the domestication is over and it is ready for use; in order to better understand the acidification under the design conditions The influence of reactor headspace pressure control and non-control on methane production and COD generation, this experiment set up the treatment of traditional acidification reactor coupling methanation reactor without regulating the headspace pressure of hydrolysis phase as a control. The acidification reactor is a percolation bed reactor with a working volu...

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Abstract

The invention relates to an improved method and system for producing methane by using a two-phase anaerobic digestion process, belonging to the field of recycling of the waste. The method comprises the following steps: maintaining headspace pressure in a hydrolytic acidification reactor at 3.0 to 3.5 psi and transferring unwanted gas in the hydrolytic acidification reactor to a methane reactor for reuse. The system comprises the hydrolytic acidification reactor, a methanation reactor, a methane gas collecting device and pressure transducer. The improved method and system provided by the invention have the characteristics of high efficiency, low cost, simple operation, reduction in carbon footprint and the like, realize the chemical oxygen demand (COD) and methane yield of 0.65 to 0.84 g per g of a volatile solid and 0.32 to 0.36 L per g of the volatile solid respectively, increases of 16 to 50% and 28 to 44% respectively compared with conventional design.

Description

technical field [0001] The invention relates to the field of resource utilization of degradable organic solid waste, and relates to an improved two-phase anaerobic digestion method and system for methane production, in particular to a method for improving the meal by adjusting the hydrogen partial pressure of the hydrolysis phase in the two-phase anaerobic digestion method. A method and system for producing methane from kitchen waste. Background technique [0002] Worldwide, food waste accounts for about 30-50% of the total municipal solid waste, and landfill is currently the most important treatment method. According to statistics, only cities and towns in China generate about 520,000 tons of municipal solid waste every day, and this figure is expected to reach 1.4 million tons / day in 2015, and it will show an increasing trend. However, since the space available for landfilling is limited and landfilling of organic solids causes serious environmental damage, the methane ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C12M1/36C12M1/34C12M1/107
CPCY02E50/30Y02P20/582
Inventor 黄焕忠颜丙花
Owner HONG KONG BAPTIST UNIV
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