A method for preparing methane from pineapple dregs or mango dregs through anaerobic fermentation

Abstract

A method for preparing methane from pineapple dregs or mango dregs through anaerobic fermentation is provided. The method includes (1) weighing biogas liquid of a biogas project adopting kitchen waste as a raw material, adding the pineapple dregs or mango dregs into the biogas liquid, with the solid-liquid mass ratio being controlled to be 6:100, and the ammonia nitrogen concentration being controlled to be about 2000 mg / L, adjusting a pH value with ammonia water to 8.5-9.0, and performing anaerobic fermentation at a maintained fermentation temperature of 35 DEG C for 60 days to obtain an inoculum; (2) subjecting the product of the step (1) to solid liquid separation to obtain a liquid supernatant and a precipitate, controlling the ammonia nitrogen concentration of the liquid supernatant to be 1500-3300 mg / L, blowing the precipitate with a small amount of the liquid supernatant to fully disperse the precipitate, and mixing the liquid supernatant the ammonia nitrogen concentration of which is adjusted and the dispersed precipitate; and (3) adding the pineapple dregs or mango dregs into the mixture with the TS% being controlled to be 1-4%, and performing fermentation. The method does not need independent acidification pretreatment, and can ensure successful biogas fermentation under conditions of enough volume loads and no increase of the volume of a fermentation tank. The method does not need a special additive.

Description

technical field [0001] The invention belongs to the technical field of methane production, and in particular relates to a method for producing methane by anaerobic fermentation using pineapple pomace or mango pomace as raw materials. Background technique [0002] West Africa is rich in mangoes, pineapples and other fruits, and the fruit processing industry is well developed, which produces a large amount of fruit pomace and rotten fruit every year. Only Benin has an annual output of 600,000 tons of pineapples. If it is piled up without treatment, it will easily become corrupt and smelly, breed mosquitoes, and pollute the environment. However, rotten fruits and fruit waste after fruit processing are good raw materials for biogas fermentation. Through the anaerobic fermentation process, organic waste can be converted into clean energy. While solving the problem of environmental pollution, it can also harvest new energy substances, and provide a green, environmentally friendly ...

AI Technical Summary

Problems solved by technology

Although this method can make the fermentation system normal, but the gas production is affected, it is necessary to increase the volume of the fermentation tank

Images