Method for preparing methane by combined fermentation of enteromorpha and straw biomass

Abstract

The invention discloses a method for preparing methane by the combined fermentation of enteromorpha and straw biomass. The method comprises the steps of fermenting fresh enteromorpha as raw materials to obtain enteromorpha biomass degradation liquid; collecting and fermenting straw solid compost to obtain a straw biomass degradation matrix; compounding the enteromorpha biomass degradation liquid and the enteromorpha degradation matrix according to the proportion, and conducting acidized fermentation to obtain an acidized matrix; putting the acidized matrix into a methane fermenting device, conducting water sealing, and fermenting the methane with constant pressure; and supplementing materials and discharging slag to conduct a new round of fermentation when the daily methane generating amount is smaller than daily average methane amount by 5%. According to the method disclosed by the invention, organic matters, namely the enteromorpha and straws, are complemented with each other, so that the buffering capability of a system is improved. According to the process, a two-step fermentation method is implemented, the fermentation starting is quick, the methane generating peak is ahead of schedule, the methane fermentation period is shortened, and the methane generating amount is high. Meanwhile, the utilization ratio of equipment is increased, and the energy consumption is lowered. According to the method, the resource utilization of the enteroporpha and the straw is realized, the sea environment is improved, the environment event formed by burning the straws can be reduced, the clean methane energy resource is produced, the multiple purposes of turning waste into wealth, saving energy and reducing emission are achieved, and the social and economical benefits are good.

Description

technical field [0001] The invention relates to the field of energy, and is a method for preparing biogas; more specifically, it is a method for preparing biogas through combined fermentation of enteromorpha and straw-like biomass. Background technique [0002] With the extensive use of fossil energy, leading to changes in the global ecological environment and a sharp reduction in fossil energy, biomass energy, as an important substitute for fossil energy, has received more and more attention from all over the world. The United Nations Development Program (UNDP), the World Energy Council (WEC) and the US Energy (IX)E all regard biomass energy as an important choice for the development of renewable energy. Biomass energy is renewable and environmentally friendly. Therefore, the development and utilization of biomass energy is an optimal way to solve energy and environmental problems. Biogas is the most important part of biomass energy, which mainly uses various wastes produ...

AI Technical Summary

Problems solved by technology

[0006] Every year, there are about 700 million tons of crop straw in my country, which is rich in organic matter (80%-90%), but most of the straw is piled up or burned, which greatly wastes biomass resources, causes serious environmental pollution, and has affected and interfered with the normal economic order. , forming a new security risk