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Application method of modified charcoal in production of methane by anaerobic digestion of kitchen waste

A technology for kitchen waste and anaerobic digestion, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of small particle size of biochar, waste of biochar, difficult to recycle, etc. Yield, simple process effect

Pending Publication Date: 2022-07-15
SHENYANG AEROSPACE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual application process, in order to achieve a good dispersion effect, the particle size of biochar is often so small that it is difficult to recycle, which not only causes waste of biochar, but also pollutes the environment to a certain extent.

Method used

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  • Application method of modified charcoal in production of methane by anaerobic digestion of kitchen waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing modified biochar and applying it in anaerobic digestion of food waste to produce methane, such as figure 1 shown, including the following steps:

[0026] (1) Take coconut shell as raw material, pulverize and sieve after drying at 105°C for 24 hours, the sieving specification is 100 mesh, put it into a tube furnace, and slowly pyrolyze at a heating rate of 10°C / min under a nitrogen atmosphere. The biochar was obtained by pyrolysis at 500 °C for 1 h, and then the biochar was washed with 1 mol / L HCl solution and then repeatedly washed with deionized water until the pH value was neutral, and then dried in an oven at 105 °C for 24 h ;

[0027] (2) The Ni (NO 3 ) 2 .6H 2 O and Fe (NO 3 ) 3 .9H 2 O put in deionized water and mix well, in which Ni(NO 3 ) 2 .6H 2 O concentration is 0.1mol / L, Fe(NO 3 ) 3 .9H 2 The O concentration is 0.2mol / L, then citric acid is added as a complexing agent (the concentration of citric acid is 0.3mol / L after add...

Embodiment 2

[0041] The method is the same as in Example 1, except that:

[0042] Loaded nickel-iron composite oxide NiFe added to food waste anaerobic digestion system 2 O 4 The modified coconut shell biochar was added in an amount of 1.0g / L;

[0043] The final methane gas production rate was 313 mL / g VS, which was 25% higher than that of Comparative Example 1-1 without biochar addition.

Embodiment 3

[0045] The method is the same as in Example 1, except that:

[0046] Loaded nickel-iron composite oxide NiFe added to food waste anaerobic digestion system 2 O 4 The modified coconut shell biochar was added in an amount of 10g / L;

[0047] The final methane gas production rate was 326 mL / g VS, which was 30% higher than that of Comparative Example 1-1 without biochar addition.

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Abstract

The invention belongs to the field of biochar preparation and the technical field of solid waste treatment, and particularly relates to an application method of modified biochar in methane production through anaerobic digestion of kitchen waste. Based on the characteristics of modified biochar particles loaded with an iron-nickel composite oxide NiFe2O4, the modified biochar particles are added into a kitchen waste anaerobic digestion methane production system, the modified biochar loaded with the iron-nickel composite oxide NiFe2O4 optimizes the conductivity of the biochar, supplements metal trace elements required by anaerobic digestion, enriches anaerobic functional florae, and improves the anaerobic digestion efficiency. And the electron transfer process between acid-producing bacteria and methanogens is enhanced, the problem of acidification of the system is relieved, the methane yield of anaerobic digestion of the kitchen waste is remarkably increased, and the modified charcoal has magnetism and is convenient to recycle. The invention further provides a preparation method of the modified biochar for the purposes, and the preparation method is low in cost, simple in process and suitable for large-scale application of the modified biochar in the anaerobic digestion process of the kitchen waste.

Description

technical field [0001] The invention belongs to the field of biochar preparation and solid waste treatment technology, and particularly relates to an application method of modified biochar in anaerobic digestion of kitchen waste to produce methane. Background technique [0002] With the rapid economic development, the production of kitchen waste is increasing year by year, and proper disposal is urgently needed. Anaerobic digestion technology can effectively process organic waste and generate clean energy. However, in the process of anaerobic digestion of food waste to produce methane, due to the rapid degradation of organic matter, a large amount of volatile fatty acids are accumulated, resulting in excessive acidification of the system and low methane yield. At present, adding biochar to the anaerobic digestion system has been proved to be one of the important ways to improve the methane production efficiency of the anaerobic digestion of kitchen waste. On the one hand, ...

Claims

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Application Information

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IPC IPC(8): C12P5/02C12N1/20C01B32/05C01G49/00
CPCC12P5/023C12N1/20C01B32/05C01G49/00C01P2004/80
Inventor 张万里刘平李彦龙邢万丽李润东杨天华
Owner SHENYANG AEROSPACE UNIVERSITY