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Method for producing biogas through mixing gibberellin fungus dreg and kitchen waste and carrying out anaerobic fermentation

A technology of food waste and anaerobic fermentation, applied in the direction of fermentation, waste fuel, etc., can solve the problems of low cost, high resources, waste, etc., and achieve the effects of improving system gas production, efficient operation, and simple equipment

Inactive Publication Date: 2016-10-12
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional treatment of food waste as feed is prohibited due to its potential risk to humans. It is used for incineration with high calorific value and high cost and waste of resources. The reduction and resource utilization of food waste has become an urban Problems that managers urgently need to solve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The food waste is collected and removed from larger impurities, then thoroughly mixed and crushed with a pulverizer, and then sieved through a sieve with a particle size of <5 mm as raw material. The inoculum sludge should be the sludge rich in active methanogens, centrifuge the sludge after standing for 6 hours at a speed of 4000 r / min for 5 minutes, remove the supernatant, and select the concentrated sludge after centrifugation. Add 30 g / L (according to 30 grams of inoculum sludge per liter of fermentation substrate) to the mixed substrate at the start-up stage of fermentation. Mix gibberellin residue and kitchen waste at a carbon-to-nitrogen ratio of 13.5:1, when the mixed substrate concentration VS = 10 g / L, the anaerobic fermentation temperature is 35±1°C, and the organic load is 4 gVS / (L ·d), under the reaction condition of hydraulic retention time of 8.6d, the average daily maximum gas production reaches 650m L / d.

Embodiment 2

[0021] The food waste is collected and removed from larger impurities, then thoroughly mixed and crushed with a pulverizer, and then sieved through a sieve with a particle size of <5 mm as raw material. Sludge should be rich in active methane bacteria, centrifuge the sludge after standing for 6 hours at 4000 r / min for 5 minutes, remove the supernatant, select the centrifuged concentrated sludge and put it in Add 30 g / L (according to 30 grams of inoculum sludge per liter of fermentation substrate) to the mixed substrate at the start-up stage of fermentation. Mix gibberellin residue and kitchen waste at a carbon-to-nitrogen ratio of 13.5:1. When the mixed substrate concentration VS = 10 g / L, the anaerobic fermentation temperature is 45±1°C, and the organic load is 5 gVS / (L·d), under the reaction condition of hydraulic retention time of 5.5d, the average daily maximum gas production reaches 720 mL / d.

Embodiment 3

[0023] The food waste is collected and removed from larger impurities, then thoroughly mixed and crushed with a pulverizer, and then sieved through a sieve with a particle size of <5 mm as raw material. Sludge should be rich in active methane bacteria, centrifuge the sludge after standing for 6 hours at 4000 r / min for 5 minutes, remove the supernatant, select the centrifuged concentrated sludge and put it in Add 30 g / L (according to 30 grams of inoculum sludge per liter of fermentation substrate) to the mixed substrate at the start-up stage of fermentation. Mix gibberellin residue and kitchen waste at a carbon-to-nitrogen ratio of 13.5:1. When the mixed substrate concentration VS = 10 g / L, the anaerobic fermentation temperature is 55±1°C, and the organic load is 6 gVS / (L·d), the maximum daily gas production reached an average of 760 mL / d under the reaction condition of a hydraulic retention time of 4.3 d.

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Abstract

The invention relates to a method for producing biogas through mixing gibberellin fungus dreg and kitchen waste and carrying out anaerobic fermentation. The method comprises the steps: (1) removing relatively large hard impurities from the kitchen waste, carrying out uniform mixing, then, crushing the mixture by a crusher, and sieving the crushed mixture by a sieve with the grain size smaller than 5mm; adopting sludge rich in active methanobacteria as inoculation sludge, carrying out standing, removing supernatant, and adding the concentrated sludge into a mixed substrate at a starting stage of fermentation according to the ratio of 30g / L; (2) mixing the gibberellin fungus dreg with the kitchen waste, and enabling the C / N ratio to be (13 to 28): 1; (3) carrying out fermentation on the mixed substrate in a CSTR (Continuously Stirred Tank Reactor) while adjusting the temperature to 10 to 80 DEG C and the organic load to 1gVS / (L.d) to 10 gVS / (L.d), so as to degrade organic matters in a fermentation system and produce the biogas. According to the method, the nutrient mixing ratio of an anaerobic fermentation system is changed, the activity of the methanobacteria is guaranteed, and the anaerobic digestion rate of the gibberellin fungus dreg and the gas production rate of the system are increased; efficient operation for mixed fermentation is achieved, the bacterial activity is guaranteed, the anaerobic fermentation rate is increased, and the equipment is simple, economical and practical, so that the method is an environment-friendly treatment mode capable of changing wastes into valuables.

Description

technical field [0001] The invention belongs to the technical field of solid waste comprehensive utilization. It involves the comprehensive utilization of gibberellin residues and kitchen waste. Background technique [0002] Gibberellin (GA for short) is widely used in agriculture because it can stimulate the growth of plant branches and leaves. According to the survey, the global gibberellin GA 3 More than 90% of the source drugs are produced in China. Because the fungus residue is a solid residue containing medium and mycelium produced after the plate-and-frame filtration of the gibberellin fermentation broth, the fungus residue is rich in a large amount of organic matter, including macromolecular proteins, amino acids, cellulose, and carbohydrates and gibberellin residues. At present, gibberellin residues are mostly piled up naturally and then landfilled. A large amount of gibberellin residues are discharged into the environment as chemical hormone pollutants every ye...

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 欧阳二明匡彬
Owner NANCHANG UNIV
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