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Method for strengthening aerobic fermentation of kitchen waste by using oil-removing microbial preparation

A technology of food waste and aerobic fermentation, applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems of large nitrogen loss, composting failure, and low-quality composting products, and achieve improved oil degradation efficiency, promote the production of organic acids, and improve the effect of recycling performance

Active Publication Date: 2022-02-08
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional composting of food waste takes a long time, a large amount of ammonia gas is produced, nitrogen loss is large, and the quality of compost products is not high
The conversion of ammonia nitrogen into ammonia volatilization requires high temperature and alkaline conditions. When composting sludge or livestock and poultry manure, in order to reduce ammonia emissions, acidic chemical substances can be added to reduce the pH of the pile and reduce ammonia volatilization by about 15-50%. Thereby reducing the loss of nitrogen, but it will increase the conductivity of the compost, making it difficult to meet the composting standard
In addition, since food waste itself is acidic, if acidic substances are added directly at the initial stage of composting, it will increase the inhibition of microorganisms, prolong the composting time, and may even lead to composting failure
In addition, in the composting process of food waste, due to the acidity of food waste, microbial activity is inhibited, the composting process is slow, and even failure occurs, which makes the composting cycle long, which is not conducive to the treatment of kitchen waste

Method used

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  • Method for strengthening aerobic fermentation of kitchen waste by using oil-removing microbial preparation
  • Method for strengthening aerobic fermentation of kitchen waste by using oil-removing microbial preparation
  • Method for strengthening aerobic fermentation of kitchen waste by using oil-removing microbial preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] One, the preparation of microbial bacterial agent:

[0040] (1) Inoculate Bacillus lysinus, Bacillus hiraeii, and Bacillus licheniformis into shake flasks containing 100 mL of culture medium at a volume ratio of 1%, and inoculate them at 35°C and shake flask rotation speed 160r / min. Cultivate for 24 hours; the medium is: peptone 10g, NaCl 10g, yeast extract 5g, distilled water 1000mL, pH 7.0-7.2.

[0041] (2) Mix the Bacillus lysinus solution, the Bacillus hirai bacteria solution, and the Bacillus licheniformis solution in a volume ratio of 1:1:1, and the cell concentrations of the three strains are 2.05, 3.22, and 1.73 g / L, to obtain the composite microbial bacterial agent.

[0042] 2. Determination of oil degradation rate of single bacteria and compound bacteria agent

[0043] Inoculate the cultured single bacteria or composite bacterial agents in a shaker flask containing 100mL oil medium at a volume ratio of 5%, culture at 35°C and a rotation speed of 160r / min for ...

Embodiment 2

[0045] Embodiment 2: Utilize microorganism to promote the method for high-efficiency aerobic fermentation of kitchen waste

[0046] Proceed as follows:

[0047] (1) Filter and remove impurities from the food waste obtained on the same day, remove paper towels, plastics, bones, etc., and obtain 12 kg of food waste;

[0048] Table 1

[0049]

[0050] (2) Crushing the kitchen waste, the particle size is about 3-5mm, and the moisture is about 70-75%;

[0051] (3) Mix food waste with rice husk and / or straw (moisture content of rice husk or straw is 8%, rice straw, wheat straw, corn straw, rape straw, cotton straw) at a wet weight ratio of 8:2, The total weight is 15 kg, the control C / N is 25-30, the moisture content is about 60%, and it is stirred at room temperature for 30 minutes to make the materials evenly mixed;

[0052] (4) with 2×10 7 CFU / g inoculate the compound microbial agent into the compost mixture, and stir for 30 minutes to make the agent evenly mixed in the co...

Embodiment 3

[0055] Embodiment 3: the method for natural aerobic fermentation of kitchen waste

[0056] Proceed as follows,

[0057] (1) Filter and remove impurities from the food waste obtained on the same day, remove paper towels, plastics, bones, etc., and obtain 12 kg of food waste;

[0058] (2) Crushing the kitchen waste, the particle size is about 3-5mm, and the moisture is about 70-75%;

[0059] (3) Mix kitchen waste and straw with a wet weight ratio of 8:2, with a total weight of 15 kg, control C / N to 25-30, moisture content of about 60%, and stir at room temperature for 30 minutes;

[0060] (4) Put the compost mixture into the compost bucket, control the ventilation rate to 0.2L / (min·L pile body), measure the temperature of the pile body every day, and turn the pile manually on the 3rd, 7th, 14th, 21st, 28th, and 35th days , and take samples to determine relevant indicators, including oil concentration, organic acid concentration, cumulative ammonia discharge, nitrate nitrogen c...

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Abstract

The invention discloses a method for strengthening aerobic fermentation of kitchen waste by using an oil-removing microbial preparation, and belongs to the field of kitchen waste recovery. According to the method, the kitchen waste is treated by using a compound microbial agent containing lysinibacillus, bacillus hirsuti and bacillus licheniformis. The method comprises the following steps: performing pretreatment such as draining and crushing on kitchen waste, mixing the kitchen waste with corn straw and a compound microbial agent to obtain a fermentation raw material, and performing aerobic fermentation in a reactor without heating and stirring treatment to obtain the organic fertilizer. On one hand, due to the use of the grease degrading bacterial agent, degradation of grease and other organic matters is promoted, generation of organic acid in the earlier stage of composting is improved, ammonia gas emission and nitrogen loss can be reduced in the treatment process, the composting quality is higher, the seed germination index is better, and the prepared fertilizer meets the organic fertilizer standard; on the other hand, ammonia gas in the composting process is reduced, secondary pollution can be reduced, and the method is more environment-friendly.

Description

technical field [0001] The invention relates to a method for strengthening the aerobic fermentation of kitchen waste with an oil-removing microbial preparation, and belongs to the field of kitchen waste recovery. Background technique [0002] Due to the rapid development of my country's national economy and people's demand for a better life, the scale of the catering industry continues to expand. At the same time, the amount of food waste generated continues to grow at a rate of 10% per year. Food waste contains high concentrations of organic matter, oil and salt, and has a high water content. If it is not treated in time, it will easily become corrupted and acidified, breed mosquitoes and flies, and pollute the surrounding environment. [0003] At present, the treatment and disposal of food waste is mainly based on biological methods, mainly including anaerobic digestion and aerobic composting. Compared with aerobic composting technology, the cycle of anaerobic digestion o...

Claims

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Application Information

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IPC IPC(8): C05F9/04C12N1/20C12R1/07C12R1/10
CPCC05F9/04C12N1/20Y02A40/20Y02W30/40
Inventor 李秀芬凌玲齐希光
Owner JIANGNAN UNIV
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