Method for producing volatile fatty acid through promoting anaerobic fermentation of kitchen wastes

A technology for volatile fatty acids and kitchen waste, applied in the field of waste recycling, can solve problems such as undeveloped, and achieve the effects of easy implementation, reduced processing costs, and low energy consumption

Inactive Publication Date: 2014-02-05
TONGJI UNIV
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  • Method for producing volatile fatty acid through promoting anaerobic fermentation of kitchen wastes
  • Method for producing volatile fatty acid through promoting anaerobic fermentation of kitchen wastes
  • Method for producing volatile fatty acid through promoting anaerobic fermentation of kitchen wastes

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Embodiment 1

[0017] The first step is to manually sort out the bones, fish bones, plastic bags, chopsticks and other sundries in the fresh kitchen waste produced in the Xiyuan canteen of a university in Shanghai, and then crush them to reduce the particle size of the organic matter to In the range of 1-5mm (in order to make the food waste uniform), the food waste reaction liquid is obtained, and then the food waste reaction liquid is fermented in the anaerobic fermentation reactor. After testing, the pH of the kitchen waste reaction liquid in the anaerobic fermentation reactor is about 4.5, and the VS / TS is 94%.

[0018] In the second step, an appropriate amount of water is added to the anaerobic fermentation reactor, and the total solid content in the kitchen waste reaction solution is adjusted to be 100g / L, and zero-valent iron with a particle size of 800 mesh produced by Shanghai Chuanghui Magnetic Materials The amount of valence iron added is the 10-40g / L kitchen waste reaction solutio...

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Abstract

The invention relates to a method for producing volatile fatty acid through promoting the anaerobic fermentation of kitchen wastes. The method comprises the steps of firstly, crushing the kitchen wastes to be up to the particle size of 1-5mm; then, regulating the content of solids to 100mg/L; next, placing the crushed kitchen wastes into an anaerobic fermentation reactor, adding 10-40g/L of marketing zero-valent iron with the particle size of 800 meshes, fermenting at the temperature of 15-40 DEG C for 4-17 days while stirring at the rotating speed of 120r/min, centrifuging, recycling the zero-valent iron in filter residues, and taking out the residual organic components to be composted or used as a liquid fertilizer to obtain the volatile fatty acid with the yield of 29.1-35.8g/L in a supernatant liquid, wherein the volatile fatty acid is detected to contain 32% of acetic acid, 17% of propionic acid, 27% of n-butanoic acid and 20% of n-pentanoic acid when the yield of the volatile fatty acid in the supernatant liquid is 29.1g/L. Compared with the conventional anaerobic fermentation for the kitchen wastes, the method has the advantages that the content of the volatile fatty acid in the supernatant liquid is increased by 2.3-13 times, the recycling of the kitchen wastes is effectively realized, and the method is low in cost, high in speed and high in social, economic and environmental benefits.

Description

technical field [0001] The invention relates to a method for promoting anaerobic fermentation of kitchen garbage to produce volatile fatty acids, and belongs to the technical field of waste recycling. Background technique [0002] Food waste (commonly known as swill) has poor appearance, high moisture content and perishability, which has a great adverse impact on the urban environment. In addition, due to the complex sources of swill and virus pollution, it seriously threatens the public health safety of the city. If food waste is directly used as animal feed, it will easily cause a variety of animal plagues, and there may also be a danger of forming a pollution chain, threatening human health and safety. However, kitchen waste is a kind of organic waste that can be utilized as a resource. It has a high content of organic matter and has a good potential for energy recovery. [0003] At present, the main treatment methods of food waste include sanitary landfill, incineration...

Claims

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Application Information

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IPC IPC(8): C12P7/54C12P7/52C12P7/40
Inventor 牛冬杰何冬伟赵由才
Owner TONGJI UNIV
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