Method for increasing anaerobic fermentation gas yield of energy grasses

Abstract

The invention relates to a method for increasing anaerobic fermentation gas yield of energy grasses. According to the method, the energy grasses are subjected to ensiling pretreatment, and lactic acid bacteria and cellulase are added at the same time during ensiling so as to change the fiber structure of the energy grasses and increase the total amount of fermentable dry matters in an ensilage raw material, thus the anaerobic-fermentation methane production efficiency of the energy grasses is increased remarkably. The method for increasing the anaerobic fermentation gas yield of the energy grasses, provided by the invention, is a biological method, ensilage additives are all biological raw materials, and ensiling is also a biological process, so that the gas production efficiency of the energy grasses can be increased remarkably, and secondary pollution can not be caused; the whole process is simple in operation and is safe and reliable, the used raw materials are wide in source and low in cost, the requirements for production sites are low, the industrial large-scale production can be carried out, and the cost is remarkably lower than that of other bioenergy, such as fossil energy, bioethanol, biodiesel and the like, so that the method has market competitiveness.

Description

technical field [0001] The invention relates to the field of renewable energy, in particular to a method for increasing the gas production of energy grass by anaerobic fermentation. Background technique [0002] my country is the world's second largest energy producer and consumer. With the continuous and rapid development of the economy, energy production has been unable to meet the rapid growth of energy consumption. The dependence on foreign oil has increased year by year, and the contradiction of energy shortage is more prominent. At the same time, my country's environmental protection The pressure is mounting. Due to its high-quality and clean characteristics, renewable energy has become a key energy type in the national energy conservation and emission reduction tasks. my country has formulated the "Renewable Energy Medium and Long-term Development Plan" in 2007, which clearly defines the role of renewable energy in my country's energy in 2020. The proportion of consump...

AI Technical Summary

Problems solved by technology

There has been some research on this issue. Liu Bin et al. have disclosed a method for producing biogas and organic fertilizer by using wet-dry joint fermentation of energy grass (CN103060388A). The corresponding reaction method (CN102321674A), Lu Xuebin and others disclosed a method for efficiently producing biogas from crop straw silage and silage straw (CN102719484A). And the straw after silage is processed in two steps to transfer most of the organic matter to the liquid phase, and then the liquid is anaerobicly fermented to produce biogas, but it uses chemical additives, and the solid-liquid separation steps are cumbersome and require chemical catalysts. Costs also need to be considered

The core of these existing methods is to destroy the structure of wood fiber itself to improve the utilization efficiency of energy grass, but the current treatment methods are limited to physical and chemical methods. Destruction has limitations, while chemical treatment not only increases conversion costs but also causes secondary pollution, and both physical and chemical methods have complicated steps and high technical requirements, which are suitable for small-scale production and are not easy to achieve industrial scale production