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A kind of pretreatment method that improves walnut shell biodegradation effect

A technology of biodegradation and walnut shell, applied in the field of walnut shell pretreatment, can solve the problems of difficult biodegradation and high acid-insoluble lignin content in walnut shell, and achieve the advantages of increasing specific surface area, improving biodegradation effect, and increasing contact area. Effect

Active Publication Date: 2021-04-20
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention aims to solve the problem that the walnut shell is difficult to biodegrade due to the high content of acid-insoluble lignin in the walnut shell, and provides a pretreatment method for improving the biodegradation effect of the walnut shell

Method used

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  • A kind of pretreatment method that improves walnut shell biodegradation effect
  • A kind of pretreatment method that improves walnut shell biodegradation effect
  • A kind of pretreatment method that improves walnut shell biodegradation effect

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specific Embodiment approach 1

[0026] Specific embodiment one: the pretreatment method that this embodiment improves walnut shell biodegradation effect, comprises the following steps:

[0027] 1. Physical pretreatment:

[0028] removing impurities in the walnut shell, physically grinding the walnut shell, and sieving to obtain walnut shell powder with a particle size of 60-80 mesh;

[0029] 2. Chemical pretreatment:

[0030] adding lye to the walnut shell powder treated in step 1, and treating it at 55-65° C. for 46-50 hours; the lye is Ca(OH) with a mass concentration of 6%-10%. 2 Solution; wherein the volume ratio of walnut shell powder and lye is 1:(0.9~1.1);

[0031] 3. Then filter out the lye, wash the residue with distilled water until the pH value does not change, adjust the pH value to 6-7 after suction filtration, and dry at 55-65°C to constant weight, which is complete.

[0032] The combination of physical pretreatment and chemical pretreatment is used to comprehensively treat walnut shells. T...

specific Embodiment approach 2

[0033] Specific embodiment 2: This embodiment differs from specific embodiment 1 in that: in step 2, the process is carried out at 60° C. for 47 to 49 hours. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0034] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the lye described in the step two is the Ca(OH) of mass concentration 7%~9% 2 solution. Others are the same as in the first or second embodiment.

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Abstract

A pretreatment method for improving the biodegradation effect of walnut shells relates to a pretreatment method for walnut shells. It is to solve the problem that the walnut shell is difficult to biodegrade due to the high content of acid-insoluble lignin. Method: 1. Physical pretreatment: physically grind walnut shells and sieve to obtain walnut shell powder; 2. Chemical pretreatment: add lye to the walnut shell powder after physical treatment; 3. Then filter out the lye solution, washed with distilled water, filtered by suction, adjusted the pH value, dried to constant weight, and completed. The present invention combines physical-chemical pretreatment, the physical pretreatment makes the binding layer of lignin and hemicellulose and cellulose partially destroyed, and the subsequent chemical treatment makes the raw material porous and further increases the internal surface area, which is beneficial to increase the Large lignin contact area with enzymes or other chemicals. Thereby improving the biodegradation effect. The invention is used in the field of natural lignocellulose degradation.

Description

technical field [0001] The invention relates to a walnut shell pretreatment method. Background technique [0002] At present, the resource and energy crisis has become increasingly prominent. How to efficiently use agricultural and forestry waste has become the focus of attention of countries all over the world. Walnut is one of the most important oil and dry fruit tree species in the world, and is recognized as a good ecological and economical tree species in the world. It is planted in 22 provinces and regions in my country, and the main production areas are in Yunnan, Shaanxi, Shanxi, Sichuan, Hebei, Gansu, Xinjiang, Anhui and other provinces. Taking Yunnan as an example, it is a famous main walnut producing area in my country. At present, the walnut planting area in Yunnan reaches 42.8 million mu, the output is 1.02 million tons, and the output value is 30.5 billion yuan. More than 90% of the counties (cities, districts) in the province plant walnuts . Walnut shells are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 燕红冯茜李金达
Owner HARBIN UNIV OF SCI & TECH
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