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Method for improving efficiency of producing methane by reinforced anaerobic digestion of hydrochar

A technology of anaerobic digestion and hydrothermal charcoal, which is applied in the field of resource utilization of organic waste, can solve the problems of no research on hydrothermal charcoal, and achieve the effect of reduction and resource utilization

Pending Publication Date: 2021-11-05
FUDAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, no research has been conducted on ball milling hydrothermal charcoal to improve its ability to promote anaerobic digestion

Method used

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  • Method for improving efficiency of producing methane by reinforced anaerobic digestion of hydrochar
  • Method for improving efficiency of producing methane by reinforced anaerobic digestion of hydrochar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0018] (1) Add 300 g of corn stalk powder and 2 L of water into a 3 L high-temperature and high-pressure reactor, react at 260 °C for 1 hour to prepare hydrothermal charcoal, wash off the soluble organic matter on the surface of hydrothermal charcoal with alcohol and dry it ;

[0019] (2) Put the dried hydrothermal charcoal into a planetary ball mill for 8 hours at a speed of 300 rpm.

[0020] (3) Set up three sets of anaerobic reactors, each with a volume of 108 mL, filled with 60 mL of glucose solution with a concentration of 4 g / L, inoculated with the same amount of microorganisms (F / M=2), and adjusted the reaction The initial pH in the vessel was 7.5, no hydrothermal charcoal was added, 10 g / L unmilled hydrothermal charcoal was added, and 10 g / L ball milled hydrothermal charcoal was added. After nitrogen was blown off to create an anaerobic environment, the three groups of reaction The device was placed in a reactor at 37°C for anaerobic fermentation. During the fermentat...

Embodiment ２

[0023] (1) Add 300 g of corn stalk powder and 2 L of water into a 3 L high-temperature and high-pressure reactor, react at 260 °C for 8 hours to prepare hydrothermal charcoal, wash off the soluble organic matter on the surface of hydrothermal charcoal with alcohol and dry it ;

[0024] (2) Put the dried hydrothermal charcoal into a planetary ball mill for 8 hours at a speed of 300 rpm.

[0025] (3) Set up three sets of anaerobic reactors, each with a volume of 108 mL, filled with 60 mL of glucose solution with a concentration of 4 g / L, inoculated with the same amount of microorganisms (F / M=2), and adjusted the reaction The initial pH in the vessel was 7.5, no hydrothermal charcoal was added, 10 g / L unmilled hydrothermal charcoal was added, and 10 g / L ball milled hydrothermal charcoal was added. After nitrogen was blown off to create an anaerobic environment, the three groups of reaction The device was placed in a reactor at 37°C for anaerobic fermentation. During the fermenta...

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Abstract

The invention provides a method for improving efficiency of producing methane by reinforced anaerobic digestion of hydrochar. The hydrochar is subjected to ball-milling modification treatment, such that the efficiency of producing methane by reinforced anaerobic digestion of hydrochar can be improved. A methane production rate of an experimental group containing the ball-milled modified hydrochar is 12.5% higher than that of an experimental group not containing the ball-milled modified hydrochar and 3.44 times that of a control group not containing the hydrochar. The method comprises the following specific steps: preparing hydrochar from biomass through hydrothermal conversion, further modifying the hydrochar by ball milling, and adding the modified hydrochar into an organic waste / wastewater anaerobic digestion methane production reactor, such that a methane production rate can be remarkably increased. The method can effectively increase a methane production rate of an anaerobic digestion reactor, improves stability of the anaerobic digestion reactor and effectively reduces and recycles an organic waste.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of organic waste, and in particular relates to a method for improving the efficiency of anaerobic digestion of organic waste to produce methane. Background technique [0002] With the acceleration of urbanization in my country, the amount of urban waste has increased rapidly, among which organic waste includes kitchen waste, feces, and residual sludge generated during sewage treatment. Anaerobic digestion (AD) is an ideal organic waste treatment method that can reduce organic waste and generate methane. However, the anaerobic reactor will not be able to achieve stable operation due to the accumulation of volatile organic acids (VFA) due to the instability of the feed amount and feed properties. The improvement of anaerobic digestion rate and stability is of great significance to the effective treatment of organic waste. [0003] Hydrochar is a solid product produced by hydrothermal ...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCC12P5/023C12P2201/00C12P2203/00Y02E50/30
Inventor 罗刚任爽张士成
Owner FUDAN UNIV
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