Device and method for preparing biogas and organic fertilizer from biomass through coupling of aerobic fermentation and anaerobic digestion

Abstract

The invention discloses a device and a method for preparing biogas and organic fertilizer from biomass through coupling of aerobic fermentation and anaerobic digestion. The method comprises the stepsas follows: solid biomass is classified by classification equipment, long fibers are crushed and then enter a mixer, aerobic composting fermentation treatment is performed after the long fibers are mixed uniformly in the mixer, and an aerobic fermented product is obtained; the aerobic fermented product is crushed, then put in a size mixing tank to be uniformly mixed and pumped in a multi-stage self-circulating anaerobic digestion reactor, effluent enters a multi-stage vortex self-circulating anaerobic reactor and a vortex self-circulating anaerobic reactor step by step to be subjected to anaerobic fermentation for production of biogas, and finally, the biogas is sent to an aerobic process section for deep treatment. As for the characteristic that high-humidity and long fibers exist in biomass materials, crushing pretreatment is performed firstly, high-temperature composting treatment is performed, the higher material temperature can be obtained without heating, no chemical decomposition agents are added, organic fertilizer can be quickly prepared through high-temperature fermentation, and the conversion rate of the materials can be higher in the following multi-stage anaerobic biogas preparation devices.

Description

technical field [0001] The invention relates to the technical field of biomass energy conversion and fertilizer conversion, in particular to a device and method for preparing biogas and organic fertilizer by coupling aerobic fermentation with anaerobic digestion of biomass. technical background [0002] A large amount of biomass waste is produced in the process of industrial and agricultural production, including Chinese herbal medicine dregs, rice straw, mulberry sticks, corn stalks, wheat straw, tobacco stalks, grass stalks, rice husks, sugarcane bagasse, cassava slag, dung dregs, fungus sticks, Wood chaff, bran, tree branches, bio-fermentation slag, livestock and poultry manure, etc., will cause serious secondary pollution to the environment if they are not disposed of scientifically and rationally. And these biomasses are rich in a large amount of organic matter, which is a rich and valuable energy and fertilizer raw material resource. The traditional utilization method...

AI Technical Summary

Problems solved by technology

The traditional utilization method is mostly bar stack or tank type aerobic fermentation process to make fertilizer, the fermentation efficiency is low, it is easy to cause secondary pollution of odor, and the resource utilization method is single. However, the biogas prepared by traditional anaerobic fermentation method has a high gas production rate Low, long fermentation cycle, acidolysis, pyrolysis, hydrolysis and other methods are mostly used for pretreatment, and a large number of chemical agents are used, resulting in high energy consumption and chemical costs, which also affect the efficiency of anaerobic

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