Garden waste lignin component fermentative degradation method

Abstract

The invention discloses a garden waste lignin component fermentative degradation method. The method includes the steps of: (1) crushing materials into materials with a particle size of 0.4-0.7cm; (2) placing the crushed materials into a first-stage fermentation area, adding a mushroom residue fermentation broth into the materials to keep the water content of the materials at 55%-65%, and conducting primary fermentation; (3) adding the mushroom residue fermentation broth into the materials subjected to primary fermentation, keeping the water content of the materials at 45%-55%, and then placing the materials in a second-stage fermentation area for secondary fermentation; and (4) putting the fermented materials subjected to secondary fermentation into a third-stage fermentation area for fermentation, thus finishing the whole fermentative degradation process. Directed at the characteristics of lignin in the materials, the method provided by the invention adopts physicochemical treatment method and biochemical treatment method for material pretreatment and material conditioning, and directed at the activity characteristics of bacteria, fungi, actinomycetes and other different dominant degrading floras at different temperature stages in the fermentative degradation process, realizes accurate condition control and efficient degradation of lignin.

Description

Technical field: [0001] The invention belongs to the technical field of resource utilization of solid waste, and in particular relates to a method for fermenting and degrading lignin components of garden waste. Background technique: [0002] With the development of society, the output of garden garbage is increasing day by day, and garden garbage is discarded and incinerated at will, resulting in environmental pollution problems. Garden waste is rich in organic matter and other nutrient elements. It is a relatively clean solid waste. In recent years, it has gradually received attention in resource utilization, especially through the use of aerobic fermentation and composting, which has been applied in some areas. However, the main components of garden waste are lignin, cellulose and hemicellulose, and the content of these three components is 20% to 30%, 40% and 20% to 30%, although many microorganisms can decompose cellulose that exists alone , but because the cellulose in ...

AI Technical Summary

Problems solved by technology

However, the main components of garden waste are lignin, cellulose and hemicellulose, and the content of these three components is 20% to 30%, 40% and 20% to 30%, although many microorganisms can decompose cellulose that exists alone , but because the cellulose in the cell wall is protected by lignin, lignin has a complete and hard shell, and is not easy to be degraded by microorganisms. Therefore, the focus and difficulty of the fermentation and degradation of garden waste lies in the degradation of lignin, and it is necessary to target the difficult degradation of lignin characteristics, do a good job of method control

[0003] Fermentation and composting methods of garden waste include heap method and bin method. The heap method statically stacks materials for fermentation, and realizes oxygen supply and heat dissipation by turning over the heap. The process is simple and the cost is low. The loss of nutrients is large, the fermentation cycle is long, and the fermentation time generally takes about 30 days, which occupies a large area of ​​the site and the degradation effect is not ideal

The warehouse method puts materials in the warehouse device, which can better solve the problems of uneven temperature and large loss of heat and nutrients in the high temperature period, and is conducive to maintaining the continuity and stability of the high temperature fermentation stage. The speed has been greatly improved, and the application requires a relatively large device volume, resulting in relatively high equipment manufacturing costs, and the practicability needs to be improved.

[0004] The above two fermentation methods have different problems, mainly because the two fermentation methods combine the heating period and high temperature period of the material fermentation and degradation process in one place, and at the same time, they lack effective condition control, resulting in low fermentation efficiency. The required site or device is relatively large

Images