Pure straw stackretting-free feeding methane fermentation method

Abstract

The invention relates to a methane fermentation method, in particular to a pure straw stackretting-free feeding methane fermentation method. The pure straw stackretting-free feeding methane fermentation method comprises the following steps: starting according to the conventional fermentation process, preferably selecting biogas residue by strains to inoculate straw, feeding a material, adding water according to the ratio of the water to the material being 9:1, stopping feeding the material when the added water and the material account for 10 percent of the whole fermentation volume of a biogas pool, and waiting for generating gas; after the gas is generated normally, feeding chopped or silage stalk in a multipoint feeding mode, feeding the material from one feed inlet each day, and feeding the material from another feed inlet for next day so as to feed the material circularly day by day and inlet by inlet; arranging a plurality of spray-heads on the top in the biogas pool, arranging ascum pump on the bottom of the pool, transporting biogas liquid on the lower part of the biogas pool through a liquid conveying pipe to the spray heads by the scum pump, spraying fermenting raw materials which enter the biogas pool and float on the upper part of the biogas liquid to acidize and neutralize the raw materials; and according to the feed amount of the current day, discharging certain amount of waste biogas residue which is fermented from the lower part of the biogas pool every day. Compared with the conventional fermentation method, the method can improve the gas production by 30 to 40 percent.

Description

Technical field: [0001] The invention relates to a biogas fermentation method, in particular to a biogas fermentation method for pure straw without stacking and retting. Background technique: [0002] For conventional biogas anaerobic fermentation, the fermentation raw materials must be stacked and retting. Conventional biogas fermentation theory holds that biogas fermentation can proceed smoothly only when the C / N ratio of fermentation raw materials is 25:1. The C / N ratio of straw is 75:1. If straw is used for biogas fermentation, the C / N ratio is too high. After such fermentation raw materials are not stacked and retting into a biogas fermentation tank, they will produce acid violently but not gas, nor any degradation. Therefore, before raw materials enter the biogas digester, compost retting must be carried out, especially straw, through compost retting to aerobically consume part of C, thereby reducing the C / N ratio and reaching the C / N ratio of theoretical fermentatio...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the disadvantages caused by stacking, stirring, and adding a large amount of water to the raw materials in the conventional biogas fermentation method, and provides a biogas fermentation method for pure straw without stacking and feeding