Reinforced multi-raw-material two-stage fully-mixed anaerobic digestion methane production method

A technology of anaerobic digestion and biogas production, which is applied in the direction of waste fuel, biological sludge treatment, sludge treatment, etc., can solve the problems of low gas production rate and low material degradation efficiency, so as to increase the solid content of the feed and reduce the heat energy Loss, the effect of reducing operating costs

Inactive Publication Date: 2017-05-17
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method of strengthening multi-raw material two-stage fully mixed anaerobic digestion to produce biogas, so as to overcome the problems of low material degradation efficiency and low ga...

Method used

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  • Reinforced multi-raw-material two-stage fully-mixed anaerobic digestion methane production method

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Embodiment 1

[0040] Livestock manure, rice straw, excess sludge, and kitchen waste are subjected to conventional pretreatment, among which, the livestock manure is homogenized to remove sand, the rice straw is crushed to less than 1cm, and the remaining sludge is homogenized to remove sand. Garbage is mechanically sorted, degreased, pulverized and pulped. After pretreatment, the TS ratio of poultry manure, rice straw, remaining sludge, and kitchen waste is: poultry manure: rice straw: remaining sludge: Food waste = 1:3:0.25:0.25 is sent to the feeding tank for mixing, and the solid content of the mixed material is adjusted to 8% by using reflux biogas slurry, and the secondary steam generated by the thermal hydrolysis process is heated by the steam in the mixing feeding tank The coil preheats the mixed material and mixes it with the high-temperature material from thermal hydrolysis, so that the preheating temperature of the total mixed material reaches 35°C, and the mixing preheating reside...

Embodiment 2

[0047] Livestock manure, rice straw, excess sludge, and kitchen waste are subjected to conventional pretreatment, among which, the livestock manure is homogenized to remove sand, the rice straw is crushed to less than 1cm, and the remaining sludge is homogenized to remove sand. Garbage is mechanically sorted, degreased, pulverized and pulped. After pretreatment, the TS ratio of poultry manure, rice straw, remaining sludge, and kitchen waste is: poultry manure: rice straw: remaining sludge: Food waste = 1:3:0.25:0.25 is sent to the feeding tank for mixing, and the solid content of the mixed material is adjusted to 10% by using reflux biogas slurry, and the secondary steam generated by the thermal hydrolysis process is heated by the steam in the mixing feeding tank The coil preheats the mixed material and mixes it with the high-temperature material from thermal hydrolysis, so that the preheating temperature of the total mixed material reaches 36°C, and the mixing preheating resid...

Embodiment 3

[0054] Livestock manure, rice straw, excess sludge, and kitchen waste are subjected to conventional pretreatment, among which, the livestock manure is homogenized to remove sand, the rice straw is crushed to less than 1cm, and the remaining sludge is homogenized to remove sand. Garbage is mechanically sorted, degreased, pulverized and pulped. After pretreatment, the TS ratio of poultry manure, rice straw, remaining sludge, and kitchen waste is: poultry manure: rice straw: remaining sludge: Food waste = 1:3:0.5:0.5 enters the mixed feeding tank for mixing, uses the reflux biogas slurry to adjust the solid content of the mixed material to 12%, and uses the secondary steam generated by the thermal hydrolysis process to heat through the steam in the mixed feeding tank The coil preheats the mixed material and mixes it with the high-temperature material from thermal hydrolysis, so that the preheating temperature of the total mixed material reaches 36°C, and the mixing preheating resi...

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Abstract

The invention discloses a reinforced multi-raw-material two-stage fully-mixed anaerobic digestion methane production method which comprises the following steps: 1, putting raw materials into a mixed feeding tank after the raw materials are commonly preprocessed; 2, adjusting the solid content of mixed materials as 8 to 15% and preheating; 3, enabling digestion pulp digested and processed by a first-stage anaerobic jar to partially reflux, thermally hydrolyzing and reinforcing the digestion pulp in high temperature, then arranging the processed digestion pulp into the mixed feeding tank and arranging the residual digestion pulp into a second-stage anaerobic jar to be processed; 4, enabling digestion pulp anaerobically digested by the second-stage anaerobic jar to partially reflux, reinforcing the digestion pulp through an ozone treatment device, returning the digestion pulp to the second-stage anaerobic jar and arranging the residual digestion pulp into a digestion pulp storage tank; 5, performing solid-liquid separation, arranging biogas residues into a composting system to be treated and reusing biogas slurry or making the biogas slurry into a liquid-state fertilizer; 6, purifying the generated biogas, wherein the biogas can be used directly after being purified. The method disclosed by the invention has the advantages of improving organic matter degradation efficiency by 30% to 50% and gas generation rate by 20% to 40%, improving dewaterability of the digestion pulp, reducing the additive amount of auxiliary materials in a later biogas residue composting technology and reducing composting operation cost.

Description

technical field [0001] The invention belongs to the technical field of anaerobic digestion treatment of organic solid waste, and in particular relates to a method for intensifying multi-raw material two-stage fully mixed anaerobic digestion to produce biogas. Background technique [0002] Because organic solid waste contains a large amount of organic matter, plant nutrients, and pathogenic microorganisms, it is easy to rot and smell. If it is not handled properly, it will not only cause waste of biomass resources, but also may cause serious secondary pollution. [0003] Anaerobic digestion technology, as one of the mature technologies for organic solid waste resource treatment, has been widely used in my country. However, most large-scale anaerobic fermentation treatment projects have a single raw material, which is subject to certain restrictions. Multi-raw material mixed anaerobic digestion gradually replaces single raw material anaerobic fermentation due to the advantag...

Claims

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Application Information

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IPC IPC(8): C12P5/02C02F11/04
CPCC02F11/04C12P5/023Y02E50/30Y02W10/20
Inventor 宋海农杨崎峰林宏飞陈国宁詹磊潘振覃茜成刚王光红夏兴良
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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