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Method and device for reducing and recycling food waste anaerobic fermentation biogas residue

A technology for anaerobic fermentation and kitchen waste, applied in the field of solid waste resource utilization, can solve the problems of high moisture content of biogas residue, insufficient resource utilization, difficult dehydration, etc. The effect of improving dehydration

Active Publication Date: 2020-07-17
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention overcomes the problems of high moisture content, difficult dehydration and insufficient resource utilization of the existing food waste anaerobic fermentation biogas residue, and provides a method for reducing the amount of food waste anaerobic fermentation biogas residue and recycling. Its device, through hydrothermal reaction, enables efficient dehydration of kitchen biogas residues, and at the same time uses hydrothermal liquid as raw material for anaerobic fermentation to obtain biogas with high calorific value, realizes resource utilization of hydrothermal solids through composting, and prepares market value biogas residue fertilizer

Method used

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  • Method and device for reducing and recycling food waste anaerobic fermentation biogas residue
  • Method and device for reducing and recycling food waste anaerobic fermentation biogas residue
  • Method and device for reducing and recycling food waste anaerobic fermentation biogas residue

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Embodiment 1

[0031]A method for reducing and recycling food waste anaerobic fermentation biogas residues, such as figure 1 As shown, it includes (1) feeding the anaerobic fermentation biogas residue of food waste into the hydrothermal reaction kettle, feeding saturated steam to contact the biogas residue for heating, so as to increase the temperature and pressure of the hydrothermal reaction kettle, and obtain hydrothermal reaction after the hydrothermal reaction is completed. mixture; (2) sending the hydrothermal mixture in step (1) into a mechanical dehydration device to separate and obtain a hydrothermal solid and a hydrothermal liquid, the mass moisture content of the hydrothermal solid is no more than 40%, and the hydrothermal liquid The concentration of COD in the medium is 10000-40000mg / L; (3) send the hydrothermal liquid separated in step (2) into a high-efficiency anaerobic reactor for anaerobic fermentation to generate biogas, and the hydrothermal liquid obtained in step (2) The ...

Embodiment 2

[0034] Take the hydrothermal liquid mixtures of different temperatures (110, 140, 160, 180, 200°C) of the medium mass of Example 1 and put them into a centrifuge, centrifuge for 10 minutes under the centrifugation condition of 7500r / min, and obtain a solid in an oven with a temperature of 75°C, and test the mixture every 1 hour Mass, converted to the water content of the hydrothermal solid when weighing each time, the result is as follows figure 2 As shown, it can be seen that as the hydrothermal temperature increases, the water content in the hydrothermal mixture decreases faster, indicating that the hydrothermal solid is easier to dehydrate.

[0035] Depend on figure 2 The suitable temperature for optimizing the hydrothermal reaction is between 140°C and 180°C. When the water temperature is lower than 140°C, the anaerobic fermentation of food waste is not heated enough, and the cell wall in the body cannot be effectively broken, so that the internal water cannot be easily...

Embodiment 3

[0037] Send the food waste anaerobic fermentation biogas residue with a moisture content of 85% into the hydrothermal reaction kettle, and feed saturated steam at a temperature of 200°C to contact and heat the food waste anaerobic fermentation biogas residue to increase the temperature and pressure of the hydrothermal reaction kettle , the temperature of the hydrothermal reaction is controlled to be 180°C, and the hydrothermal mixture is obtained after the hydrothermal reaction for 1 hour; the remaining steam after the hydrothermal reaction is mixed with saturated steam and passed into the hydrothermal reaction kettle. The hydrothermal mixture is subjected to solid-liquid separation through a plate and frame filter press to obtain hydrothermal solids and hydrothermal liquids; the moisture content of the hydrothermal solids is 30%, and the COD concentration in the hydrothermal liquids is 30,000 mg / L. Dilute the separated hydrothermal liquid to a COD concentration of 10,000 mg / L ...

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Abstract

The invention relates to a method and device for resource reduction and resource utilization of food waste anaerobic fermentation biogas residues. The method utilizes hydrothermal technology to pretreat food waste anaerobic fermentation biogas residues, and then obtains hydrothermal liquid through mechanical separation And hydrothermal solids, hydrothermal liquids are used as raw materials for reanaerobic fermentation to obtain biogas that provides energy for hydrothermal reactions, and hydrothermal solids are used as raw materials for composting to produce fertilizers. The method of the invention improves the dehydration efficiency of anaerobic fermentation biogas residues of kitchen waste, significantly reduces the volume of biogas residues, fully utilizes the organic matter contained in biogas residues, turns waste into treasure, and realizes anaerobic fermentation biogas residues of food waste. Slag reduction and recycling have good environmental and economic benefits.

Description

technical field [0001] The invention relates to the field of resource utilization of solid waste, in particular to a method and a device for reducing the amount of food waste anaerobic fermentation biogas residue to resource. Background technique [0002] With the further development of urbanization and population surge in our country, a large amount of kitchen waste will be produced every year. However, traditional food waste treatment processes (such as incineration and landfill technology) are gradually banned due to the following deficiencies. The burning of kitchen waste will produce polluting gas, leading to environmental pollution, and requires a lot of equipment investment; landfill technology needs to occupy a lot of land, and will also pollute the land. Therefore, the safe and harmless treatment of kitchen waste has become an urgent environmental problem to be solved. Anaerobic fermentation technology mainly uses microorganisms to efficiently utilize organic matt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02B09B3/00B09B5/00C05F15/00C12M1/107
CPCC12M21/04C12M43/04C12M47/18C12P5/023C05F3/00B09B3/00B09B5/00B09B3/80C05F9/04Y02W30/20Y02E50/30
Inventor 李春星汪印李杰余广炜
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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