Acta Agriculturae Zhejiangensis ›› 2025, Vol. 37 ›› Issue (10): 2165-2178.DOI: 10.3969/j.issn.1004-1524.20240942

• Environmental Science • Previous Articles     Next Articles

Influence of initial substrate pH value on physicochemical properties and microbial community during composting

WAN Hefeng1(), LIU Guohua1, WU Yuxiang1,*(), JIANG Juan1,2, ZHANG Zhenming2, LIU Yong3   

  1. 1. Guizhou Institute of Biology, Guizhou Academy of Sciences, Guiyang 550009, China
    2. College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China
    3. School of Biological and Environmental Engineering, Guiyang University, Guiyang 550005, China
  • Received:2024-11-04 Online:2025-10-25 Published:2025-11-13

Abstract:

Based on the agro-industrial waste (vinasse, sawdust, by-product of monosodium glutamate, cow dung), mixtures with the initial pH of 6.00 (T1), 6.57 (T2) and 7.98 (T3) were prepared for composting. The field sampling, indoor physical and chemical analysis and high-throughput sequencing were combined to investigate the dynamic of physiochemical properties and microbial community during the composting. It was shown that the dominant bacteria phylum of T1 treatment changed from Actinobacteria to Firmicutes from temperature-rising stage to maturity stage, while the dominant bacteria genus remained as Brevibacterium. The dominant bacteria phylum of T2 treatment changed from Actinobacteria to Bacteroidetes from temperature-rising stage to maturity stage, and the dominant bacteria genus changed from Glutamicibacter to Corynebacterium. The dominant bacteria phylum of T3 treatment changed from Proteobacteria to Firmicutes from temperature-rising stage to maturity stage, and the dominant bacteria genus changed from Ignatzschineria to Bacillus. For fungi, Ascomycota was the dominant phylum for all treatments at the tempertaure-rising stage, high temperature stage and maturiy stage. At the maturity stage, the compost of T1 and T2 were acidic, while the compost of T3 was alkaline. The total nutrient (N+P2O5+K2O) content, heavy metals content, pH value and germination index of the compost under T1, T2 and T3 all met the standards of Organic Fertilizer(NY/T 525-2021). The research could provide reference for the further production of special fertilizer with specific pH value according to the properties of agro-industrial waste.

Key words: agro-industrial waste, industrial composting, physicochemical property, microbial community succession

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