Humification Process and Microbial Driving Mechanism of Composting

doi:10.13560/j.cnki.biotech.bull.1985.2022-0134

Abstract

Abstract:

Aerobic composting is a typical biochemical process of stabilizing and harmless organic waste. In this process,organic matter is decomposed by microorganisms and then polymerized to form humus（HS）. Due to its complex network structure,it is difficult for lignin to be completely degraded by microorganisms in the high temperature stage of compost. In addition,as the raw material and skeleton of HS formation,the deep degradation of lignin is of great significance to the humification process of composting. The composting cooling and humification stage are the key periods of HS formation,in which fungi and ligninase play an important role in deepening lignin degradation and enhancing humification. Temperature and pH are important environmental factors affecting humification process,and their regulation is an important means to strengthening humification process artificially. This paper reviewed the degradation mechanism of lignin by key enzymes,the interaction between precursor substances and humic acid formation,and the driving mechanism of fungi on humic acid formation. It is suggested that exploring the key genes and enzymes involved in HS anabolic pathway in composting is an important direction of composting humification in the future.

Key words: humification process of composting, lignin, precursor, fungi, microbial driving mechanism

WANG Yu-yun, ZHAO Bing, MA Li-ting, LI Lan, DENG Ya-qin, XU Zhi. Humification Process and Microbial Driving Mechanism of Composting[J]. Biotechnology Bulletin, 2022, 38(5): 22-28.

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