Method of producing biogas through high-solid two-phase three-stage anaerobic digestion by using perishable organic wastes

An anaerobic digestion technology for organic waste, applied in waste fuel, fermentation, etc., can solve the problems of reducing the anaerobic digestion treatment efficiency of perishable organic waste and biogas production capacity, reducing the concentration of raw materials, etc., to achieve good filtration effect, The effect of increasing the effective storage volume and increasing the effective processing volume

Active Publication Date: 2012-09-05
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, not only a large amount of water needs to be consumed to reduce the concentration of raw materials, but also the low concentration of raw materials greatly reduces the efficiency of anaerobic digestion of perishable organic waste and the ability to produce biogas

Method used

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  • Method of producing biogas through high-solid two-phase three-stage anaerobic digestion by using perishable organic wastes
  • Method of producing biogas through high-solid two-phase three-stage anaerobic digestion by using perishable organic wastes

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Add a small amount of kitchen waste from the feed hopper 1 to the hydrolysis acid production reactor 2, and control the temperature of the hydrolysis acid production reactor 2 at 37°C.

[0035] (2) Collect the anaerobic activated sludge in the digester, pump it into the methane reactor 3 through the branch pipeline 27, after the anaerobic activated sludge submerges the fiber filler 16, continue to pump the anaerobic activated sludge until it is hydrolyzed Kitchen waste leachate is formed at the bottom of the acid-generating reactor 2, and when the leachate height is close to the porous plate 8, the valve of the branch pipeline 27 is closed to stop pumping the anaerobic activated sludge. 37°C.

[0036] (3) In the hydrolysis acid production reactor in the above process, the kitchen waste is hydrolyzed in the anaerobic activated sludge to generate acetic acid, propionic acid, butyric acid, valeric acid, pyruvic acid, lactic acid, ethanol and a small amount of Carbon d...

Embodiment 2

[0044] The steps of this embodiment are the same as in Example 1, wherein the processing raw material is meat processing waste, and

[0045] In the step (2), the temperature of the control methanogenic reactor 3 is 25° C.; in the step (3), the hydrolysis acid production control pH is 6.5; 8.0; in the step (5), through 20 days of repeated leachate circulation, the temperature of the control hydrolysis acid production reactor 2 is 25 ℃, and the pH is 6.5; the temperature of the methanogenic reactor is 25 ℃, and the pH is 8.0; the step In (6), the temperature of the hydrolysis acid production reactor is controlled to be 25°C, the pH is 6.5, the temperature of the methane production reactor is 25°C, and the pH is 8.0; in step (7), part of the meat processing waste is removed every 40 days for hydrolysis residue; every 60 days in step (8), remove the leachate sediment; every 60 days, clean and refill the filter filler 14 in the filter bed 12 .

Embodiment 3

[0047] The steps of this embodiment are the same as in embodiment 1, wherein the processing raw material is vegetable processing waste, and

[0048] In the step (1), the temperature of the hydrolysis acid generation reactor 2 is controlled to be 60° C.; the temperature of the methane production reactor 3 is controlled to be 60° C. in the step (2); the hydrolysis acid generation control temperature of the step (3) is 60° C. The pH is 4.5; in the step (4), the control temperature of acetic acid and methane production is 60 ℃, and the pH is 6.5; in the step (5), the temperature of the hydrolysis acid production reactor 2 is controlled through multiple leachate circulations of 15 days. 60 DEG C, the pH is 4.5; the temperature of the methanogenic reactor 3 is 60 DEG C, and the pH is 6.5; the temperature of the controlled hydrolysis acid production reactor 2 in step (6) is 60 DEG C, and the pH is 4.5; The temperature is 60°C and the pH is 6.5; in step (7), remove part of the vegetab...

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Abstract

The invention provides a method for producing biogas through high-solid two-phase three-stage anaerobic digestion by using perishable organic wastes, which comprises the following steps: the perishable organic wastes are hydrolyzed in a hydrolysis acidogenic reactor, and a mixture obtained after hydrolysis is acidified to generate a large number of organic acid products with low molecular weight;the bottom of the hydrolysis acidogenic reactor is communicated with the bottom of a methanogenic reactor through a circulation pump and a pipeline; the top of the methanogenic reactor is communicated with the top of the hydrolysis acidogenic reactor; and the acetic acid producing reaction is carried out in the methanogenic reactor and the methane producing reaction is continuously carried out. The invention can separate the hydrolysis acidogenic process from the acetic acid and methane producing process in the anaerobic digestion process so as to prevent organic acids generated by the perishable organic wastes from inhibiting methanogenesis. The device has simple processing procedure, low cost, easy maintenance and stable and reliable performance, is suitable for anaerobic digestion treatment of various perishable organic wastes, and has highly efficient and stable biogas production capacity of the perishable organic wastes through the anaerobic digestion.

Description

technical field [0001] The invention relates to a method for treating organic garbage, more specifically, the invention relates to a method for producing biogas by high-solid two-phase three-stage anaerobic digestion using perishable organic garbage as raw materials. technical background [0002] Perishable organic waste mainly refers to perishable and biodegradable waste generated in the process of life and production, including kitchen waste, slops, vegetable, fruit and meat processing waste, etc. Due to the acceleration of urbanization and the improvement of living standards, not only the absolute output of perishable organic waste has increased significantly, but also the proportion of urban domestic waste has also increased significantly. More than 50% of. The biggest feature of perishable organic waste is the high moisture content and organic matter content, the moisture content is generally above 70%, and the organic matter content is generally above 90% on a dry bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02
CPCY02E50/343Y02E50/30
Inventor 李东孙永明袁振宏孙晓英李连华
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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