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Method for efficient production of biogas from straw

A straw and biogas technology, applied in the field of high-efficiency biogas production from straw, can solve the problems of low fermentation efficiency, low utilization rate of biogas residue and biogas slurry, and low efficiency, and achieve the goal of solving environmental pollution, improving utilization rate, and increasing gas production rate Effect

Inactive Publication Date: 2016-03-23
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing method of producing biogas from straw mixes straw with water and directly uses it for microbial degradation. Since the contact area between solid straw and microorganisms is small, it is not conducive to the direct utilization and decomposition of microorganisms, so the efficiency is low.
There is an urgent need to improve the process to avoid the problems of low fermentation efficiency and low utilization rate of biogas residue and biogas slurry caused by the direct use of straw fermentation, so as to improve the efficiency of biogas production from straw and the utilization rate of straw

Method used

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  • Method for efficient production of biogas from straw

Examples

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Effect test

Embodiment 1

[0026] Example 1 Take 10kg of fresh straw, grind it into 0.5cm straw particles with a pulverizer, then add 1000kg of 60°C aqueous solution containing 0.05mol / L cobalt chloride to the straw particles, mix well, Soak for 8h. After completion, the solid-liquid mixture enters the solid-liquid separator for pressing to separate the solid from the liquid. Liquid COD obtained by pressing process Cr It can reach 50000mg / L, and it can produce 400m3 per ton of straw dry matter by using UASB high-efficiency anaerobic reactor for anaerobic fermentation to produce biogas. 3 Biogas yield, solid residues are composted.

Embodiment 2

[0027] Embodiment 2 Get 20kg of air-dried stalks, utilize a pulverizer to be crushed into 1.0cm straw granules, then add 1000kg to the stalk granules, an aqueous solution containing 0.25mol / L ferric chloride and 0.25mol / L cobalt chloride at 80°C, Mix well and soak for 4h under the condition of stirring at 50r / min. After completion, the solid-liquid mixture enters the plate and frame filter press for pressing to separate the solid from the liquid. Liquid COD obtained by pressing process Cr It can reach 35000mg / L, and use UASB high-efficiency anaerobic reactor for anaerobic fermentation to produce biogas, which can reach 200m3 per ton of straw dry matter 3 The yield of biogas, solid residues are incinerated.

Embodiment 3

[0028] Example 3 Take 100kg of fresh straw, the mixture of air-dried straw and silage straw, use a pulverizer to crush it into 2.0cm straw particles, and then add 1000kg to the straw particles, 100 ° C containing ferric chloride, cobalt chloride and chlorine The concentration of nickel chloride is 0.5mol / L aqueous solution, mix evenly, soak and stir for 1h under the condition of stirring at 100r / min. After completion, the solid-liquid mixture enters the solid-liquid separator for pressing to separate the solid from the liquid. Liquid COD obtained by pressing process Cr It can reach 43000mg / L, and use EGSB high-efficiency anaerobic reactor for anaerobic fermentation to produce biogas, which can reach 320m3 per ton of straw dry matter 3 The yield of biogas, solid residues are composted.

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Abstract

The invention relates to a method for efficient production of biogas from straw. The method comprises the following steps: soaking straw with a water solution which contains a metal salt catalyst by a certain concentration so that one part of soluble and diffluent organic matters in the straw are transferred to a liquid phase from a solid phase, pressing a solid-liquid mixture in a solid-liquid separator or a plate-and-frame filter press, so that solid and liquid are separated, fermenting the obtained liquid in an anaerobic environment to produce biogas and composting or drying and incinerating solid residues as required. The method disclosed by the invention can avoid the problems of low fermentation efficiency, low biogas residue and biogas slurry utilization rate and the like in fermentation by direct utilization of the straw. According to the method, most components, for fermentation, in the straw, are dissolved in the liquid for direct fermentation, and the solid residues obtained from pressing, instead of being wasted, are composted or incinerated to release heat energy. The utilization rate of the straw is improved, the biogas yield is increased and environmental pollution caused by burning of the straw is solved as well.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a method for efficiently producing biogas from straw. Background technique [0002] With the continuous development of society, the supply of non-renewable resources such as oil and coal has become increasingly tight, and the environmental pressure has become increasingly heavy. Therefore, it is imminent to find new renewable resources. Among many renewable resources, biomass resources have been generally considered to be one of the fundamental ways to solve the future energy crisis due to their abundant reserves and environmental friendliness. my country is a large agricultural country, and the annual output of crop straw is very huge. According to statistics, the annual output of straw is about 700 million tons, which contains rich energy and a large amount of nutrient pollution. How to use this huge renewable resource scientifically and efficiently has Become a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
CPCY02E50/30
Inventor 吕学斌郑旭静古小超
Owner TIANJIN UNIV
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