Method for producing hydrogen by fermenting organism and alkali mat composite pretreated straw fiber raw erial at two steps

A biological pretreatment, straw fiber technology, applied in microorganism-based methods, biochemical equipment and methods, biosynthesis, etc., can solve the problem of reducing the utilization rate of toxic by-product raw materials, reducing the utilization rate of raw materials in the fermentation process, and hindering the hydrogen production process. Practical application and other issues, to achieve the effect of improving the utilization rate of raw materials, reducing the formation of by-products, and avoiding losses

Inactive Publication Date: 2011-04-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional alkaline pretreatment process also converts soluble sugars, part of hemicellulose, and cellulose into by-products. On the one hand, the by-products will have a toxic effect on microorganisms, which is not conducive to subsequent fermentation; on the other hand, traditional alkaline pretreatment also reduces Raw material utilization in the fermentation process
[0007] As mentioned above, some methods for producing hydrogen by anaerobic fermentation of straw fiber raw materials have been reported in the prior art,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 Alkali pretreatment straw fermentation hydrogen production

[0037] Using corn stalks (taken from the suburbs of Daxing, Beijing) and Clostridium thermocellum DSM No.7072 (purchased from the German Culture Collection Center) to pretreat the hydrogen production process of straw fiber raw materials with alkali, the steps are as follows:

[0038] (1) Raw material crushing and alkali pretreatment

[0039] Collect straw fiber raw materials, use a plant grinder to crush the particle size below 15mm, mix straw, water and sodium hydroxide in a ratio of 10:200:1, place it at 55°C for 3 days, wash the residue with water until neutral, and obtain alkali pretreatment straw.

[0040] (2) Raw material mixing

[0041] A certain amount of alkali pretreated straw and nutrient salt solution are mixed and added to the hydrogen production reactor, wherein the concentration of alkali pretreated straw is 10g / L, and each liter of nutrient salt solution includes (NH 4 ) 2 SO 4 ...

Embodiment 2

[0046] Example 2 Hydrogen production by alkali pretreatment of straw fermentation

[0047] Corn straw and sorghum straw (taken from the suburbs of Daxing, Beijing, with a mixing ratio of 10:10), Clostridium thermocellum DSM No.7072 and Clostridium pyrolyticum DSM No.869 (purchased from the German Culture Collection) The process of fermenting hydrogen production through alkali pretreatment of straw fiber raw materials is as follows:

[0048] (1) Raw material crushing and alkali pretreatment

[0049] Collect straw fiber raw materials, use a plant grinder to crush to a particle size of 15mm or less, mix straw, water and sodium hydroxide in a ratio of 12:200:1, place it at 120°C for 15 minutes, wash the residue with water until it is neutral, and obtain alkali pretreatment straw.

[0050] (2) Raw material mixing

[0051] Mix a certain amount of alkali-pretreated straw and nutrient solution into the hydrogen production reactor, wherein the concentration of alkali-pretreated st...

Embodiment 3

[0056] Example 3 Biological and Alkaline Pretreatment Straw Fermentation Hydrogen Production

[0057] Using corn stalks, Clostridium thermocellum DSM No.7072 is a two-step fermentation hydrogen production process through composite pretreatment of straw fiber raw materials. The steps are as follows:

[0058] (1) Crushing and mixing of raw materials

[0059] Collect straw raw materials, use a plant pulverizer to crush them to a particle size below 15mm, mix a certain amount of straw raw materials and nutrient salt solution, and then add them to the hydrogen production reactor, wherein the straw concentration is 10g / L, and the nutrient salt composition is the same as in Example 1 .

[0060] (2) The first step of fermentation hydrogen production and biological pretreatment

[0061] Add thermophilic bacteria seed solution with 10% inoculum amount, stir evenly and carry out the first step of anaerobic fermentation to produce hydrogen. The temperature of the hydrogen production ...

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Abstract

The invention belongs to the technical field of renewable energy sources and particularly relates to a method for producing hydrogen by fermenting an organism and alkali composite pretreated straw fiber raw material at two steps. The method comprises the following steps of: (1) crushing the straw fiber raw material and mixing the crushed raw material with a nutritive salt solution to obtain a mixture; (2) introducing a thermophile bacteria seed solution into the mixture and carrying out the first-step anaerobic fermentation to produce hydrogen gas; (3) mixing fermentation residue, water and sodium hydroxide according to the proportion for alkali pretreatment, pre-treating the residue and washing to be neutral to obtain a compound pretreated straw fiber; and (4) mixing the obtained compound pretreated straw fiber with the nutritive salt solution, introducing the thermophile bacteria seed solution into the mixture and carrying out the second-step anaerobic fermentation to produce hydrogen gas. Compared with the traditional method for producing the hydrogen by pre-treating the straw with alkali, the method for producing hydrogen by fermenting the composite pretreated straw fiber at two steps ensures that the hydrogen-producing level is improved by 75 percent, the utilization rate of the raw material is improved to 70 percent from 40 percent and the expense for the alkali pretreatment is reduced by 40 percent.

Description

technical field [0001] The invention belongs to the technical field of renewable energy. Specifically, the invention relates to a method for producing hydrogen by two-step fermentation of straw fiber raw materials for biological and alkali composite pretreatment. Background technique [0002] In the 21st century, the development of renewable energy has become a hot spot worldwide, and the use of waste biomass for renewable energy has become an important way to deal with energy and environmental crises. Hydrogen can be used directly as a fuel, or it can be directly converted into electrical energy through an electrochemical reaction through a fuel cell for use in transportation, etc. As an energy carrier, hydrogen has outstanding advantages such as high energy density, green and pollution-free, and is a green and renewable energy in the true sense. [0003] According to reports, currently 90% of hydrogen comes from the conversion of primary energy (coal, oil and natural gas)...

Claims

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Application Information

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IPC IPC(8): C12P3/00C12P39/00C12R1/01C12R1/145
CPCY02E50/343Y02E50/30Y02P20/59
Inventor 刘春朝成喜雨
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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