Processing method for fermenting straws in dry-process and wet-process combined way

Abstract

The invention relates to a processing method for fermenting straws in a dry-process and wet-process combined way, which can realize dry-process and wet-process combined fermentation treatment of straw garbage through a straw pre-softening step, a solid-liquid primary fermentation step, a dry-process aerobic digestion and decomposition step, a wet-process anaerobic digestion step and a desulfurization and drying step. By means of the method disclosed by the invention, kitchen garbage is subjected to resource treatment safely and effectively; the harmless treatment is realized; the treatment process is free from pollution; bacterial virus can be prevented from spreading; and the method is an environment-friendly straw garbage treatment method, has good economical efficiency and is capable of realizing virtuous ecological cycle.

Description

technical field [0001] The invention belongs to the technical field of garbage treatment engineering, and relates to a treatment method for straw garbage, in particular to a method for processing dry and wet combined fermentation straw. Background technique [0002] At present, the disposal and resource utilization methods of crop straws produced in the agricultural production process mainly include fertilizer utilization of straw returning to the field, utilization of green storage feed, utilization of chemical raw materials, and energy utilization methods such as incineration, power generation, and gas production. Among them, straw fermentation to produce biogas is a way of energy utilization. [0003] The straw resources in rural areas of our country are very rich. At present, there are nearly 20 kinds of important crop straws, and the output is huge. It is estimated that my country produces 700 million tons of crop stalks every year, of which 42% are returned to the fie...

AI Technical Summary

Problems solved by technology

The fermentation cycle is closely related to the project investment. If the fermentation cycle cannot be reduced, the project investment and project area are relatively large.

[0019] Second, it is more difficult to feed in and out

The traditional pump feed is extremely difficult, but the expensive plunger pump can do the job

Most of the small biogas digesters are manually fed, so large-scale projects are limited; there are also problems with the discharge of the material, and the fermentation tank must be emptied once every time the material is discharged. On the one hand, it is easy to cause safety accidents, and the next startup is also more troublesome

[0020] Third, stirring is difficult, especially in dry fermentation projects, because the dry matter content is relatively high and the fermentation liquid is relatively viscous, it is difficult to achieve stirring

[0021] Fourth, the scum is serious. Due to the lack of effective stirring, relatively light dry matter is easy to form scum, which affects the gas production effect

[0022] Fifth, the gas production rate is uncontrollable, and the gas production process of straw is periodic. The gas production is large in the early stage of fermentation, and the gas production in the later stage is small

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