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Method for generating biogas by anaerobic fermentation of vegetable straws with high content of lignocellulose

A technology of lignocellulose and anaerobic fermentation, applied in the field of biogas production by anaerobic fermentation of vegetable straw with high lignocellulose content, can solve the problems of irrational energy structure in rural areas, lack of effective treatment methods, pollution of urban and rural environments, etc., and achieve improvement The effect of raw material utilization, shortening fermentation time, and reducing environmental hazards

Active Publication Date: 2015-02-18
INST OF AGRI RESOURCES & ENVIRONMENT SHANDONG ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problems of random stacking of harvested vegetable stalks, poultry manure and other solid wastes, pollution of urban and rural environments, lack of effective treatment methods and unreasonable rural energy structure in agricultural production in my country. Taking potato stalks and cucumber vines as examples, Provide a method for joint resource utilization of vegetable straw with high lignocellulose content and cow dung

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A method for producing biogas by anaerobic fermentation of vegetable stalks with high lignocellulose content, comprising the following steps:

[0047] (1) Grinding fresh potato stalks to 0.8 cm, placing the crushed potato stalks in an airtight container, adding catalyst A accounting for 5% of the dry weight of the crushed vegetable stalks, mixing evenly, and pretreating at a temperature of 30° C. for 4 hours; Then add Catalyst B accounting for 5% of the dry weight of crushed vegetable stalks and mix evenly. At a temperature of 35° C., use semi-closed pre-degradation for 4 days. After solid-liquid separation, pretreated potato stalks are obtained. Fresh potato stalks contain water The rate is 74% by mass percentage,

[0048] Described catalyst A is sodium dodecylsulfonate (SDS), sodium ethylenediamine tetraacetate (EDTA‐Na 2 ), sodium chloride and hydrogen peroxide, the concentration of sodium dodecylsulfonate (SDS) in catalyst A is 0.5wt%, sodium ethylenediaminetetraac...

Embodiment 2

[0055] The same as the method for producing biogas by anaerobic fermentation of vegetable stalks with high lignocellulose content described in Example 1, the difference is that:

[0056] In step (1), take the naturally-dried potato stalks and crush them to 0.8 cm. The moisture content of the potato stalks after natural drying is 19% by mass percentage. The crushed potato stalks are placed in an airtight container. 4% of the dry weight of vegetable stalks was mixed evenly with Catalyst A, and pretreated at a temperature of 30°C for 8 hours; The formula pre-degraded for 8 days, and after solid-liquid separation, the pretreated potato stalks were obtained.

[0057] Indicators such as biogas production are measured every day. After 20 days of anaerobic fermentation, the total output in this example was 78400 mL, the gas production was 9.8 mL / g*day, and the methane content was 59%.

Embodiment 3

[0059] The same as the method for producing biogas by anaerobic fermentation of vegetable stalks with high lignocellulose content described in Example 1, the difference is that:

[0060] In step (1), fresh potato stalks are pulverized to 0.9cm, the concentration of sodium dodecylsulfonate (SDS) in catalyst A is 0.5wt%, sodium ethylenediaminetetraacetic acid (EDTA‐Na 2 ) concentration is 0.3wt%, the concentration of sodium chloride is 0.3wt%, and the concentration of hydrogen peroxide is 0.5wt%.

[0061] The concentration of magnesium sulfate in the catalyst B is 0.05wt%, the concentration of ferrous sulfate is 0.03wt%, the concentration of iron sulfate is 0.03wt%, and the concentration of lactic acid is 0.25wt%.

[0062] In step (2), take 800 kg of pretreated potato stalks in step (1) and mix them with 800 kg of fresh cow manure, add water and stir evenly, adjust the water content to 80%, and adjust the C / N ratio to 25:1 to obtain a mixed solution;

[0063] Step (3), add 800k...

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Abstract

The invention relates to a method for generating biogas by anaerobic fermentation of vegetable straws with high content of lignocellulose. The method comprises the following steps: after crushing vegetable straws, adding catalysts A and B for pretreatment; mixing the pretreated vegetable straws with fresh cow manure and / or pig manure; adding active sludge as an inoculum; adjusting the pH value to 7.2-8.0; putting into an anaerobic reactor; and carrying out anaerobic fermentation at 30-37 DEG C. Reductive and harmless utilization of vegetable straw wastes can be effectively achieved by resource utilization of the vegetable straws and cow manure, so that the environmental damage is greatly reduced, and meanwhile, the generated biogas, biogas residues and biogas slurry are of relatively high economic values. The method is higher in fermentation starting speed, is hardly acidified in system and is more stable in fermentation process. Compared with single raw material fermentation of cow manure, the gas yielding hold time is lasting, the total gas yield is high, and the comprehensive cost is low.

Description

technical field [0001] The invention relates to a method for energy utilization of planting and animal husbandry by-products, in particular to a method for producing biogas by anaerobic fermentation of vegetable stalks with high lignocellulose content, and belongs to the field of biogas technology. Background technique [0002] With the rapid development of my country's social economy, the level of agricultural modernization is increasing day by day, and various characteristic breeding and planting industries are booming all over the country, which not only enriches the ever-expanding market demand, but also greatly drives the increase in the income level of farmers. Agriculture and animal husbandry such as vegetable planting, beef cattle, and dairy cattle breeding have formed a relatively complete industrial structure in some provinces and cities, forming a comprehensive system from planting and raising to post-production primary processing, product deep processing, high val...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C02F11/04
CPCY02E50/30
Inventor 付龙云王艳芹姚利杨光宋效宗袁长波
Owner INST OF AGRI RESOURCES & ENVIRONMENT SHANDONG ACADEMY OF AGRI SCI
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