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Method for producing medium-chain fatty acid from fermented liquor of livestock and poultry manure

A medium-chain fatty acid, livestock and poultry manure technology, applied in the field of medium-chain fatty acid production, to achieve the effect of reducing methanation and reducing metabolic activity

Active Publication Date: 2020-08-04
INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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Problems solved by technology

It was concluded that most of the existing research or patents are aimed at acetic acid-ethanol wastewater with a single substrate or relatively simple components, and the product is generally dominated by a single hexanoic acid; while for the simultaneous production of multiple medium-chain fatty acids by using a mixed short-chain fatty acid solution Research not reported

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  • Method for producing medium-chain fatty acid from fermented liquor of livestock and poultry manure
  • Method for producing medium-chain fatty acid from fermented liquor of livestock and poultry manure
  • Method for producing medium-chain fatty acid from fermented liquor of livestock and poultry manure

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Embodiment 1

[0018] The mixed short-chain fatty acid solution obtained from the fermentation of livestock and poultry manure contains complex components, which generally include acetic acid 2000-8000mg / L, propionic acid 500-3000mg / L, n-butyric acid 500-4000mg / L, isobutyric acid 300-2000mg / L, n-valeric acid 100-2000mg / L and isovaleric acid 100-2000mg / L.

[0019] This embodiment includes the following steps:

[0020] A. Heat-treat the inoculated sludge in advance; the pretreatment conditions for the inoculated sludge are 70°C water bath for 3 hours, 85°C water bath for 3 hours and 90°C water bath for 3 hours.

[0021] B. Fermentation substrate: first add 150mL of inoculated sludge in a 2000mL anaerobic fermentation bottle (effective volume 1500mL), then add the mixed short-chain fatty acid solution (C2~C5) obtained by the fermentation of livestock and poultry manure again, and measure the short-chain fatty acids in the fermentation system The initial content of chain fatty acids is about (...

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Abstract

The invention belongs to the field of organic waste resource recycling, and relates to a method for producing medium-chain fatty acid by using livestock manure fermentation broth. The method for producing medium-chain fatty acid by using the livestock manure fermentation broth comprises the following steps that S1, heat treatment is carried out on inoculated sludge first; S2, a mixed short-chain fatty acid solution is added to the inoculated sludge after heat treatment; and S3, ethanol is added to drive a carbon chain extension reaction of mixed short-chain fatty acid to produce the medium-chain fatty acid. According to the method for producing medium-chain fatty acid by using the livestock manure fermentation broth, the complex mixed short-chain fatty acid can complete the multi-step carbon chain extension reaction in a same open culture system, compared with other previous studies, a variety of medium-chain fatty acid such as hexanoic acid, heptanoic acid and octanoic acid can be simultaneously produced through the method, sterilization is not required in the method, the method is easy to operate and can adapt to the short-chain fatty acid of any component ratio, the obtained hexanoic acid, the obtained heptanoic acid and the obtained octanoic acid are easy to separate, and high economic value is achieved.

Description

technical field [0001] The invention belongs to the field of resource recycling of organic wastes, and in particular relates to a method for producing medium-chain fatty acids from livestock and poultry feces fermentation liquid. Background technique [0002] Short-chain fatty acids are key intermediate metabolites in the anaerobic digestion of organic waste. On the one hand, they can be used to produce biogas, and on the other hand, they can be used to synthesize high-value-added medium-chain fatty acids through reverse β-oxidation (carbon chain elongation reaction). Compared with short-chain fatty acids, medium-chain fatty acids, as an important carboxylic acid platform compound, have the following characteristics: (1) relatively low solubility in water (≤1%), easy to separate and extract; (2) can be used in synthetic biology As the precursor of fuel, it is reported that medium-chain fatty acids can be converted into C6-C12 straight-chain alkanes by Kolbe decarboxylation r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/40
CPCC12P7/40
Inventor 董红敏张万钦尹福斌朱志平尚斌曹起涛陈永杏
Owner INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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