Circular inoculation method used for accelerating fermentation process of municipal sludge dry method

Abstract

The invention belongs to the field of solid waste resource, and in particular relates to a circular inoculation method used for accelerating a fermentation process of a municipal sludge dry method. The method comprises the following steps of: fermenting a first-batch material; after inoculating exogenous granular sludge for the first time, making the material undergo a hydrolysis stage, an acidification stage and a gasification stage in turn; respectively taking a proper amount of the material in the hydrolysis stage, the acidification stage and a gas production peak stage of the first-batch material for starting hydrolysis inoculation, acidification stage inoculation and gasification stage inoculation on the next-batch material; continuing performing the fermentation process on each batch of materials after inoculating each time until discharging. In the method, the dominant strain inoculation and culture are performed in a targeted way according to microbial enrichment regularity indifferent stages of the fermentation process, which can effectively shorten transition time of each stage, promote the fermentation process, enhance ecological functions of microorganisms fermented by a dry method, achieve resource management of municipal sludge, and remarkably save equipment investment and land occupation.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and in particular relates to a cyclic inoculation method for accelerating the dry fermentation process of urban sludge. Background technique [0002] The amount of dewatered sludge produced by urban sewage treatment plants due to the purification of domestic sewage is huge. At present, the annual collection capacity is about 26 million tons. The treatment and disposal of sludge in sewage treatment plants mostly use concentration and dehydration followed by landfill. This method not only occupies limited land resources, but also easily causes secondary pollution. In addition, the resource utilization rate of landfill is low, which does not conform to the principle of sustainable development in my country. In recent years, the global energy structure is undergoing a transition from fossil energy-based to the coexistence of multiple energy sources, and issues such as food security and environme...

AI Technical Summary

Problems solved by technology

[0005] Compared with dry fermentation of non-viscous organic materials such as garbage, the difficulty of dry fermentation of sludge lies in: the reaction matrix has a high viscosity, TS concentration is high, and the material is in a plastic and non-flowing state, resulting in the transfer of reaction intermediate products and energy in the medium Difficult diffusion, slow start of fermentation, long cycle, difficult enrichment of methanogenic bacteria

Regarding the existing method of dry fermentation, it is not suitable for the sludge dry fermentation process because it does not target the material characteristics of dewatered sludge

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