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Organic waste anaerobic digestion method

A technology for organic waste and anaerobic digestion, which is applied in chemical instruments and methods, waste fuel, biological sludge treatment, etc., and can solve problems such as poor mass transfer effect, low methane production efficiency, and long reaction cycle

Active Publication Date: 2020-10-27
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the process of anaerobic digestion of traditional organic waste, such as municipal sludge, kitchen or kitchen waste, and crop straw, there are a series of problems such as poor mass transfer effect, low methane production efficiency, and long reaction cycle, which limit the organic waste. Application of anaerobic digestion technology in waste field

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Examples

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Embodiment 1

[0032] This example aims to implement a method for enriching efficient microorganisms to enhance anaerobic digestion of organic waste in a batch methane production experiment using municipal sludge as a substrate.

[0033] Using the residual sludge (VS / TS=45.1-70.8%, TS=1.5-5.1%) of the secondary sedimentation tank of the sewage treatment plant as the substrate, the anaerobic digestion sludge (VS / TS=33.2- 48.9%, TS=2.1-6.3%) as the inoculum, and batch anaerobic methanogenesis experiments were carried out in 500 mL serum bottles.

[0034] A magnet-ferric oxide catalyst was then added, wherein the magnet was a spherical ferrite magnet with a diameter of 3 cm, the particle size of ferric oxide was 200 nm, and the mass ratio of ferric oxide to magnet was 1:2. The mass ratio of VS of excess sludge to VS of inoculum was 2:1, and the mass ratio of ferric oxide to TS of excess sludge was 1:1. At the same time, a blank group with only inoculum was set up to eliminate the influence of ...

Embodiment 2

[0046] The purpose of this example is to implement a method for enriching efficient microorganisms and enhancing anaerobic digestion of organic waste in a semi-continuous methanogenic experiment using kitchen waste as the substrate.

[0047] The anaerobic digested sludge (VS / TS=31.6- 48.9%, TS=2.3-5.7%) was used as the inoculum, and a semi-continuous anaerobic methanogenesis experiment was carried out in a reactor with a working volume of 2 L.

[0048] Added the magnet-ferric oxide catalyst again, wherein the magnet is a cylindrical NdFeB magnet with a diameter of 4cm and a height of 1cm, the particle size of the ferric oxide is 100nm, and the mass ratio of the ferric oxide to the magnet is 1:10, adding The mass ratio of Fe3O4 to TS of food waste was 1:3, and the mass ratio of VS of food waste to inoculum was 2:1. At the same time, a blank group with only inoculum was set up to eliminate the influence of inoculum.

[0049] The semi-continuous reactor discharges 200mL and fee...

Embodiment 3

[0058] This example aims to implement a method for enriching highly efficient microorganisms to enhance anaerobic digestion of organic waste in the continuous methane production experiment.

[0059] Using the residual sludge of the secondary settling tank (VS / TS=50.9-68.8%, TS=1.7-4.8%) as the substrate, the anaerobic digestion sludge in the anaerobic digestion reactor (VS / TS=33.1-45.8 %, TS=2.0-5.5%) as the inoculum, and the continuous methane production experiment was carried out in a reactor with a working volume of 4 L.

[0060] Added magnet-ferric oxide catalyst again, wherein magnet is internal diameter 2cm, outer diameter 4cm, the ferrite magnet ring of high 1cm, ferric oxide particle diameter is 150nm, ferric oxide and magnet mass ratio are 1: 1. The mass ratio of the VS of the remaining sludge to the VS of the inoculum is 2:1. At the same time, a blank group with only inoculum was set up to eliminate the influence of inoculum.

[0061] Adopt continuous feeding and d...

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Abstract

The invention relates to an organic waste anaerobic digestion method. The method comprises the steps of adding organic waste, inoculum and a catalyst rich in high efficiency microorganisms to a reactor, and performing stirring for a reaction to generate methane. The catalyst adopts a magnet as a basal body and ferroferric oxide as a surface adsorber to enrich electrical activity microorganisms capable of realizing efficient anaerobic transformation of the organic waste and enable the microorganisms to be quickly combined with the ferroferric oxide on the surface of the magnet to form a biomembrane, the rate for generating the methane through anaerobic digestion is increased, the organic loading and the methane generating amount of an anaerobic digestive system can be increased, and the reaction period can be shortened. Compared with the prior art, the catalyst is used for enriching the electrical activity microorganisms capable of realizing efficient anaerobic transformation of the organic waste and enabling the microorganisms to be quickly combined with the ferroferric oxide on the surface of the magnet to form the biomembrane, the rate for generating the methane through anaerobicdigestion is increased, the organic loading and the methane generating amount of the anaerobic digestive system can be increased, and the reaction period can be shortened.

Description

technical field [0001] The invention relates to the field of organic waste treatment and resource utilization, in particular to a method for anaerobic digestion of organic waste. Background technique [0002] As the rate of resource consumption is getting faster and faster, environmental problems are also increasing. Among them, the organic carbon content in organic waste is equivalent to 1 billion tons of standard coal. Anaerobic digestion technology realizes resource recovery while promoting the reduction, stabilization and harmlessness of organic solid waste. It is an important technical guarantee for improving resource utilization efficiency and supporting the construction of ecological civilization. In the process of anaerobic digestion of organic waste, complex organic matter needs to undergo a series of biochemical steps such as hydrolysis, acidification, and acetic acidification to turn into small molecule organic matter such as acetic acid, and then undergo the pro...

Claims

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Application Information

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IPC IPC(8): C12P5/02C02F11/04
CPCC12P5/023C02F11/04Y02E50/30C02F3/341C02F11/15
Inventor 戴晓虎李磊蔡辰
Owner TONGJI UNIV
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