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Method for producing biodiesel by utilizing kitchen garbage

A technology of food waste and biodiesel, which is applied in the field of resource utilization of food waste, can solve the problems of underutilization of organic matter, underutilization, losses, etc. volume effect

Inactive Publication Date: 2010-06-09
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology has the following problems. First, due to the limitation of the raw material waste oil source, many large-scale biodiesel enterprises have seriously insufficient operating capacity and are in a loss situation; second, a large amount of organic matter in kitchen waste has not been fully utilized.

Method used

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  • Method for producing biodiesel by utilizing kitchen garbage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Food waste (from a canteen of a university in Nanjing), using magnetic separation and manual selection methods to remove various solid impurities, adding water at a volume ratio of 1:4 between food waste and water, crushing and beating with a beater, and making the beated The pH value of the kitchen waste was adjusted to 5.5 (adjusted with dilute HCl), and it was sterilized at 121°C for 15 minutes before use.

[0053] The sterilized culture medium is inoculated with 10% (v / v), and the number of inoculated viable bacteria reaches 10 8 The cfu / mL yeast cell suspension is subjected to liquid fermentation, and the yeast cell suspension is composed of Rhodosporidium yeast and Trichosporidium dermatoides in a ratio of 1:1 of living cells. During the fermentation process, the temperature is controlled at 28°C, and the fermentation time is 72 hours. In the period from 0 to 48 hours, the aeration ratio of the fermenter is 0.4, and the rotation speed of the stirring paddle is 160...

Embodiment 2

[0056] Food waste (from a canteen of a university in Nanjing), using magnetic separation and manual selection methods to remove various solid impurities, adding water at a volume ratio of 1:6 between food waste and water, crushing and beating with a beater, and crushing the beated The pH value of the kitchen waste was adjusted to 6.0 (adjusted with dilute HCl), and it was sterilized at 115°C for 30 minutes before use.

[0057] The sterilized culture medium is inoculated with 10% (v / v), and the number of inoculated viable bacteria reaches 10 9 The cfu / mL yeast cell suspension is subjected to liquid fermentation, and the yeast cell suspension is composed of Rhodosporidium yeast and Trichosporidium dermatoides in a ratio of 1:1 of living cells. During the fermentation process, the temperature was controlled at 28°C, and the fermentation time was 72 hours. In the period from 0 to 48 hours, the aeration ratio of the fermenter was 0.5, and the rotation speed of the stirring paddle w...

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Abstract

The invention discloses a method for producing biodiesel by utilizing kitchen garbage, which comprises the following steps of: removing solid sundries out of the kitchen garbage; then adding water, pulping, regulating a pH value to be weak acidity and sterilizing; inoculating yeast cells to a kitchen garbage homogenate for liquid state fermentation, introducing gas at the temperature of 25-30 DEG C, stirring and fermenting for 70-75 hours; collecting the yeast cells after filtering a fermented liquor; crushing the yeast cells through a high-pressure homogenizer; adding the crushed cells into an extracting solvent, leaching, collecting an upper-layer organic solvent phase to obtain mixed oil, and evaporating and reclaiming the solvent in the mixed oil to obtain microbial grease; and obtaining the biodiesel through a methyl esterification reaction of the microbial grease. In the method of the invention, organic components in the kitchen garbage are converted into the microbial grease by adopting a microbial fermentation method to prepare the biodiesel, thereby solving the problem of insufficient raw material sources when the biodiesel is prepared by utilizing drainage oil, and laying a foundation for the resource utilization of the kitchen garbage and the industrialization development of the biodiesel.

Description

technical field [0001] The invention relates to a resource utilization method of kitchen waste, in particular to a method for producing biodiesel from kitchen waste. Background technique [0002] With the rapid development of urban modernization and the improvement of people's living standards, my country's catering industry is increasing at a rate of more than 10% per year, followed by the increasing discharge of kitchen waste. The solid waste in the catering industry is mainly food waste rich in organic matter, which is characterized by high moisture content, high oil and salt content, perishability, fermentation, and odor. According to statistics, 3.5 million hotels and restaurants across the country generate as much as 60,000 tons of kitchen waste every day. Since the vast majority of cities have not introduced measures for the centralized treatment of kitchen waste, the recycling of urban swill waste is still in a state of disorder. Food waste will become one of the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P39/00C12P7/64C10L1/02C12R1/645
CPCY02E50/13Y02E50/10
Inventor 熊强熊晓辉姚忠陆利霞
Owner NANJING UNIV OF TECH
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