Vertical continuous anaerobic dry fermentation method

Abstract

The invention discloses a vertical continuous anaerobic dry fermentation method and device. The method comprises steps as follows: a high-solid-content waste and an inoculum are fully mixed in a homogenization tank, and a mixed material is formed; the mixed material enters an anaerobic fermentation tank via a continuous feeding device; the mixed material is subjected to an anaerobic fermentation reaction in the anaerobic fermentation tank to produce biogas; a residual material after anaerobic fermentation is continuously discharged out of the fermentation tank through a screw discharging device at the bottom of the fermentation tank; a fermentation residue is subjected to solid-liquid separation in the screw discharging device to form biogas residues and biogas slurry; part of the biogas residues flow back to the homogenization tank to serve as an inoculum; part of the biogas slurry sequentially passes through a biogas slurry pump, a biogas slurry buffer tank and a spray pump to be sprayed into the fermentation tank again. With the adoption of the dry fermentation method and device, continuous feeding of the high-solid-content material subjected to anaerobic dry fermentation can be completed, the anaerobic fermentation tank can produce biogas continuously and stably, and the construction cost of the anaerobic fermentation biogas supply device is reduced. Meanwhile, the structure is simple, the investment is low, and operation and maintenance costs are low.

Description

technical field [0001] The invention relates to a vertical anaerobic dry fermentation method and equipment, in particular to a continuous anaerobic dry fermentation method and equipment. Background technique [0002] The disposal and recycling of solid organic waste has always been an important issue in the field of environmental protection. In recent years, the amount of solid organic waste such as agricultural and forestry waste, agricultural product processing waste, dehydrated municipal sludge, and kitchen waste has increased significantly. These solid wastes contain a large amount of organic matter, and if they cannot be disposed of in time, they will pose a great threat to the environment. At present, the treatment methods for these solid wastes mainly include: landfill, composting, incineration and anaerobic fermentation. Among them, the anaerobic fermentation method can recycle the energy while processing these wastes, and its construction and operation costs are r...

AI Technical Summary

Problems solved by technology

However, this process has the disadvantage of occupying a large area due to the horizontal fermentation.

Moreover, since the material moves to the discharge end by relying on the inclination angle of the horizontal fermentation bin, it is difficult to ensure the sufficient movement of the material in this discharge method, and it is impossible to control the discharge

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