Method for producing biogas through utilizing lignocellulose raw material

A technology of lignocellulose and biogas, applied in the direction of waste fuel, fermentation, etc., can solve the problems of lignocellulose raw material collection and transportation cost limitation, promotion of biogas fermentation technology, etc., to improve hydrolysis efficiency, increase gas production rate and gas production efficiency effect

Active Publication Date: 2015-01-07
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 the same time, the collection and transportation costs of lignocellulosic raw materials are also one of the problems that limit the promotion of biogas fermentation technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Crush corncobs, use dilute sulfuric acid with a mass fraction of 0.05%, a solid-to-liquid ratio of 15, a reaction temperature of 210°C, and a reaction time of 10 minutes for dilute acid hydrolysis, and filter after hydrolysis to obtain the initial corncob dilute acid hydrolyzate.

[0024] Then use lime to adjust the pH of the hydrolyzate to 10.0, filter and neutralize to obtain corncob dilute acid hydrolyzate.

[0025] The obtained corncob dilute acid hydrolyzate was diluted with water to an initial COD of 2000 mg / L, and urea and potassium dihydrogen phosphate were added to adjust the C / N mass ratio of the diluted hydrolyzate to 50:5, and the C / P mass ratio to 50:1.

[0026] The anaerobic granular sludge is loaded into the anaerobic fermentation tank, and the amount of sludge is 80% of the volume of the reactor.

[0027] The corn cob dilute acid hydrolyzate containing nitrogen source and phosphorus source was pumped into the anaerobic fermentation tank for continuous fe...

Embodiment 2

[0029] Using sawdust as raw material, using dilute hydrochloric acid with a mass fraction of 5% and a solid-to-liquid ratio of 2.5, the reaction temperature is 80°C, and the reaction time is 300 minutes for dilute acid hydrolysis. After hydrolysis, filter to obtain the initial dilute acid hydrolyzate of sawdust.

[0030] Then adjust the pH of the hydrolyzate to 5.5 with calcium carbonate, filter and neutralize to obtain a dilute acid hydrolyzate of sawdust.

[0031] The obtained sawdust dilute acid hydrolyzate was diluted with water to an initial COD of 10,000 mg / L, and yeast extract and ammonium dihydrogen phosphate were added to adjust the C / N mass ratio of the diluted hydrolyzate to 100:5, and the C / P mass ratio to 200:1.

[0032] The anaerobic granular sludge is loaded into the upflow anaerobic sludge bed reactor, and the amount of sludge loaded is 10% of the volume of the reactor.

[0033] Pump dilute acid hydrolyzate of sawdust into the upflow anaerobic sludge bed reacto...

Embodiment 3

[0035] Bagasse was used as raw material, after pulverization, dilute acid hydrolysis was carried out with a mass fraction of 3% formic acid, a solid-to-liquid ratio of 10, a reaction temperature of 170°C, and a reaction time of 200 minutes. After hydrolysis, it was filtered to obtain the initial bagasse hydrolyzate.

[0036] Then use sodium hydroxide to adjust the pH of the hydrolyzate to 7.5, filter and neutralize to obtain a bagasse enzyme hydrolyzate.

[0037] The obtained bagasse enzymatic hydrolyzate was diluted with water to an initial COD of 25000 mg / L, and peptone and potassium hydrogen phosphate were added to adjust the C / N mass ratio of the diluted hydrolyzate to 500:5, and the C / P mass ratio to 500:1.

[0038] The anaerobic granular sludge is loaded into the anaerobic granular sludge expanded bed reactor, and the amount of sludge is 60% of the volume of the reactor.

[0039] Pump the bagasse enzymatic hydrolyzate into the anaerobic granular sludge expanded bed react...

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Abstract

The invention discloses a method for producing biogas through utilizing a lignocellulose raw material. The method comprises steps of: adopting a diluted acid hydrolysis method to hydrolyze the lignocellulose raw material so as to obtain a hydrolysate containing water-soluble organic matters, then regulating the pH to be 5.5-10.0, and filtering to obtain the hydrolysate clear liquid; adding water to dilute, and adding nitrogen and phosphorus nutrient substances to ferment the raw materials; adding an anaerobic fermentation strain into an anaerobic reactor, continuously and anaerobically fermenting, and maintaining the fermentation raw materials in the anaerobic reactor for 3-20h, wherein the fermenting temperature is 15-50 DEG C. The diluted acid is adopted to hydrolyze the lignocellulose raw material so as to obtain the water-soluble organic matters, so that the biogas production rate and biogas production efficiency are increased; a feeding mode for biogas fermentation is a liquid feeding mode, so that the fermentation scale can be broadened according to practical requirements; and the method can be popularized in not only rural areas but also towns and cities on large scale.

Description

Technical field: [0001] The invention relates to a method for producing biogas, in particular to a method for producing biogas (biogas) from lignocellulosic raw materials. Background technique: [0002] Biogas, commonly known as biogas, is the product of microorganisms co-fermenting degradable organic waste under anaerobic conditions. The shrinking of traditional energy supply and the need to increase the share of renewable energy in energy consumption have made biogas more and more important. Traditionally, lignocellulosic raw materials widely sourced from nature include industrial and agricultural wastes, herbaceous plants, hardwoods, softwoods, etc., especially various industrial and agricultural wastes such as straw, bagasse, corn cobs, etc. are considered to be ideal raw materials for biogas fermentation. [0003] At present, most of the general biogas fermentation methods at home and abroad are solid or semi-solid feed, that is, solid and semi-solid lignocellulosic raw...

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 陈新德黄超熊莲陈雪芳杨小燕张海荣罗峻郭海军李颖颖
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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