Quick starting and stable operation method for dry anaerobic fermentation of kitchen garbage

A dry-type anaerobic fermentation and kitchen waste technology, applied in fermentation, waste fuel, etc., can solve the problems of not meeting the needs of industrial applications, harsh application conditions, and long time periods, so as to achieve high-load rapid start-up and promote hydrolysis and the effect of transforming and strengthening the activity

Active Publication Date: 2019-09-20
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this technical solution is that it is mainly aimed at the joint dry anaerobic fermentation of poultry and livestock waste and cellulose biomass to improve the anaerobic gas production efficiency of the two types of substances and the fertilizer efficiency of fermentation residues while avoiding the treatment of fermentation biogas liquor problem
But its disadvantages are: the application conditions of adding yeast are harsh, additional substrates such as glucose need to be added to ensure the concentration of reducing sugar, the cost is high, and the time period required for adding yeast to restore the gas production of the biogas production system is long, which cannot meet the actual requirements. Industrial Application Requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for rapid start-up and stable operation of dry anaerobic fermentation of food waste under low inoculum ratio conditions, comprising the following steps:

[0041] (1) Preparation of activated industrial waste yeast liquid

[0042] Prepare 2% (mass percent) glucose medium, after sterilization, inoculate 2% (mass percent) of commercially available industrial waste yeast, and perform anaerobic activation for 2 hours at a speed of 150 rpm and a temperature of 35° C. to obtain activated industrial yeast Waste yeast liquid;

[0043] (2) Inoculation between anaerobic inoculation sludge and kitchen waste

[0044] Commercially available granular sludge with a solid content of 17% and commercially available flocculent sludge with a solid content of 16% were mixed at a mass ratio of 2:1 to form anaerobic inoculated sludge with a solid content of 16.8%. Inoculation ratio of 1.5 with food waste (calculated as VS) and food waste after wet heat degreasing with a solid conten...

Embodiment 2

[0048] A method for rapid start-up and stable operation of dry anaerobic fermentation of food waste under low inoculum ratio conditions, comprising the following steps:

[0049] (1) Preparation of activated industrial waste yeast liquid

[0050] Prepare 2% (mass percent) glucose medium, after sterilization, inoculate 2% (mass percent) of commercially available industrial waste yeast, and perform anaerobic activation for 2 hours at a speed of 150 rpm and a temperature of 35° C. to obtain activated industrial yeast Waste yeast liquid;

[0051] (2) Inoculation between anaerobic inoculation sludge and kitchen waste

[0052] Granular sludge with a solid content of 17% and flocculent sludge with a solid content of 16% are mixed at a mass ratio of 2:1 to form a blended sludge with a solid content of 16.8%, and the inoculation ratio of inoculated sludge to kitchen waste is 1.5 (in terms of VS) mixed evenly with kitchen waste with a solid content of 11.8%, added to the semi-continuou...

Embodiment 3

[0056] A method for rapid start-up and stable operation of dry anaerobic fermentation of food waste under low inoculum ratio conditions, comprising the following steps:

[0057] (1) Preparation of activated industrial waste yeast liquid

[0058] Prepare 2% (mass percent) glucose medium, after sterilization, inoculate 2% (mass percent) of commercially available industrial waste yeast, and perform anaerobic activation for 2 hours at a speed of 150 rpm and a temperature of 35° C. to obtain activated industrial yeast Waste yeast liquid;

[0059] (2) Inoculation between anaerobic inoculation sludge and kitchen waste

[0060] Mix the granular sludge with a solid content of 17% and the flocculent sludge with a solid content of 16% at a mass ratio of 2:1 to obtain a blended sludge with a solid content of 16.8%, with an inoculation ratio of 1.5 (calculated as VS) , mixed with the food waste with a solid content of 23.5% after wet heat degreasing in a 2L fully mixed reactor, the filli...

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Abstract

The invention discloses a quick starting and stable operation method for dry anaerobic fermentation of kitchen garbage, and belongs to the technical field of resource utilization of organic solid wastes. The quick starting and stable operation method for dry anaerobic fermentation of the kitchen garbage comprises the following steps: (1) activating industrial waste yeast or active feed yeast; (2) carrying out inoculating between anaerobic inoculation sludge and kitchen waste, wherein the inoculation ratio is 0.8-1.5 counted on the basis of VS; and (3) anaerobic treatment: purging with nitrogen or biogas for 3-30 minutes at an anaerobic fermentation temperature of 33-38 DEG C. According to the quick starting and stable operation method for dry anaerobic fermentation of kitchen garbage, starting time is shortened ((20 days), so that a dry anaerobic fermentation mechanism of organic solid wastes such as kitchen wastes and organic domestic wastes which are easy to acidify and a related microbial community structure and function change can be rapidly carried out in a laboratory. The method also helps to further reduce the starting difficulty of dry anaerobic practical engineering of organic solid wastes such as kitchen wastes and organic domestic wastes which are quite easy to acidify, and the stability and methane yield of a reactor are improved.

Description

technical field [0001] The invention relates to a quick start-up and stable operation method for dry-type anaerobic fermentation of kitchen waste, and belongs to the technical field of resource utilization of organic solid waste. Background technique [0002] Anaerobic fermentation technology is a technology that can transform organic matter into clean energy, and can realize the resource utilization of organic matter such as kitchen waste and straw. Compared with traditional wet anaerobic fermentation, dry anaerobic fermentation (TS 20%-40%) has many advantages: (1) The fermentation raw material is solid, with less water consumption, basically no biogas slurry is produced, and there is no biogas slurry treatment problem; (2) The biogas residue has a low moisture content, and it can produce economic benefits when it is made into an organic fertilizer; (3) The organic load is high, and the reactor volume is small, which can save the occupied area. [0003] However, due to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
CPCC12P5/023Y02E50/30
Inventor 祁光霞孟伟查金张思梦任连海
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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