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Method for improving methane yield of corn straw anaerobic digestion by combined pretreatment of alkali and salt

A corn stalk and anaerobic digestion technology, applied in fermentation, waste fuel, etc., can solve problems such as affecting the digestion reaction process and reducing metabolic activity, and achieve the effects of improving gas production performance, reducing investment costs, and increasing the volume of total methane production

Active Publication Date: 2015-05-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of anaerobic digestion, if anaerobic microorganisms cannot take in the appropriate amount of micronutrients, it will lead to a decrease in metabolic activity, which will affect the progress of the entire digestion process.

Method used

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  • Method for improving methane yield of corn straw anaerobic digestion by combined pretreatment of alkali and salt
  • Method for improving methane yield of corn straw anaerobic digestion by combined pretreatment of alkali and salt
  • Method for improving methane yield of corn straw anaerobic digestion by combined pretreatment of alkali and salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Use a blue cap bottle (1L) as an anaerobic reaction vessel with a reaction volume of 0.8L. According to the corn stalk load of 65g TS / L, first weigh three parts of corn stalks crushed to below 20 mesh, each with a mass of 52g (calculated as TS ), add 2% potassium hydroxide of corn stalk dry weight, add metal salt salt solution (ferrous chloride (FeCl 2 4H 2 O) is 1% of the dry weight of corn stover, cobalt chloride (CoCl 2 ·6H 2 O) The amount added is 0.05% of the dry weight of corn stalks, nickel chloride (NiCl 2 ·6H 2 O) the amount of addition is 0.05% of the dry weight of corn stalks), then add 308.68 milliliters of water to make it and the water (3.32 milliliters) in the corn stalks be six times the water of the dry weight of corn stalks, evenly mix and seal in the blue cap bottle , pretreated for 3d at room temperature. Add 12g of TS anaerobic sludge to the pretreated corn stalks, and at the same time add tap water to 80% of the reactor volume. The control gr...

Embodiment 2

[0039] Use a blue cap bottle (1L) as an anaerobic reaction vessel with a reaction volume of 0.8L. According to the corn stalk load of 65g TS / L, first weigh three parts of corn stalks crushed to below 20 mesh, each with a mass of 52g (calculated as TS ), add 2% potassium hydroxide of corn stalk dry weight, add metal salt salt solution (ferrous chloride (FeCl 2 4H 2 O) is 7.5% of the dry weight of corn stalks, cobalt chloride (CoCl 2 ·6H 2 O) The amount added is 0.5% of the dry weight of corn stalks, nickel chloride (NiCl 2 ·6H 2 O) the amount of addition is 0.5% of the dry weight of corn stalks), and then add 308.68 milliliters of water to make it and the water (3.32 milliliters) in the corn stalks be six times the water of the dry weight of corn stalks, evenly mix and seal in the blue cap bottle , pretreated for 3d at room temperature. Add 12g of TS anaerobic sludge to the pretreated corn stalks, and at the same time add tap water to 80% of the reactor volume. The contro...

Embodiment 3

[0056] Use a blue cap bottle (1L) as an anaerobic reaction vessel with a reaction volume of 0.8L. According to the corn stalk load of 65g TS / L, first weigh three parts of corn stalks crushed to below 20 mesh, each with a mass of 52g (calculated as TS ), add 2% potassium hydroxide of corn stalk dry weight, add metal salt salt solution (ferrous chloride (FeCl 2 4H 2 O) is 15% of the dry weight of corn stalks, cobalt chloride (CoCl 2 ·6H 2 O) The amount added is 1% of the dry weight of corn stalks, nickel chloride (NiCl 2 ·6H 2 O) the amount of addition is 1% of the dry weight of corn stalks), and then add 308.68 milliliters of water to make it and the water (3.32 milliliters) in the corn stalks be six times the water of the dry weight of corn stalks, and seal it in a blue cap bottle after mixing evenly , pretreated for 3d at room temperature. Add 12g of TS anaerobic sludge to the pretreated corn stalks, and at the same time add tap water to 80% of the reactor volume. The c...

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Abstract

The invention discloses a method for improving methane yield of corn straw anaerobic digestion by combined pretreatment of alkali and salt, and belongs to the technical field of anaerobic fermentation of agricultural organic solid wastes. The method comprises the following steps: crushing the corn straw, and carrying out pretreatment the corn straw by employing potassium hydroxide and metal salts as pretreatment agents, wherein the metal salts comprise ferrous chloride, cobalt chloride and nickel chloride; adding water, so that the total mass of the water and the water contained in the corn straw is six times of dry weight of the corn straw; fully stirring, and sealing by a sealing film; carrying out sealed storage at a room temperature for 3 days, and then carrying out anaerobic fermentation, wherein activated sludge is needed in the anaerobic fermentation process; adding activated sludge which is 12g TS relative to 52g of TS corn straw, and adding water to reach 80% of total volume of a reaction device; filling nitrogen, and sealing by virtue of a rubber stopper; and fixing the reactor in a table concentrator, and keeping the constant temperature of the table concentrator at 35+ / -2 DEG C. According to the method, the anaerobic fermentation cycle can be shortened; the total gas production volume and the total methane production volume are greatly improved; and the removal rate of substances is significantly improved.

Description

technical field [0001] The invention belongs to the field of anaerobic fermentation of agricultural organic solid waste. Specifically, it relates to a method for improving methane production in the anaerobic fermentation process of corn stalks by using alkaline compounds to pretreat corn stalks and adding metal salts. Background technique [0002] The annual output of crop straw in my country is huge, but the utilization rate of straw is not high. Most of the straw rots naturally or burns on the spot, resulting in a considerable amount of straw being abandoned and a great waste of resources. Therefore, the resource utilization of waste straw has always been a research hotspot, and the use of anaerobic digestion technology to convert straw into biogas with high calorific value has great development potential and utilization value. [0003] The use of anaerobic digestion technology to treat corn stalks is a method that can effectively convert straws into clean energy and real...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
CPCY02E50/30
Inventor 李秀金刘春梅袁海荣邹德勋刘研萍朱保宁
Owner BEIJING UNIV OF CHEM TECH
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