School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China.
School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China; Key Laboratory of Biometallurgy, Ministry of Education, Changsha, 410083, China.
J Environ Manage. 2022 Feb 1;303:114144. doi: 10.1016/j.jenvman.2021.114144. Epub 2021 Nov 26.
The purpose of this study was to find an economical and effective amendment for improving composting performance and product quality, as well as to analyze the microbial community succession in the whole phase of composting. Therefore, the effect of reusable amendment bamboo sphere on composting performance and microbial community succession during food waste composting was investigated. The results showed that 6% bamboo sphere treatment had the highest degree of polymerization (3.7) and humification index (0.18). Compared with control, 6% bamboo sphere amendment increased total nitrogen (TN), phosphorus (TP) and potassium (TK) contents by 13.61%, 19% and 17.42%, respectively. Furthermore, bamboo sphere enhanced bacterial-fungal diversity and improved microbial community composition by enhancing the relative abundance of thermo-tolerance and lignocellulolytic bacteria and fungi. The five most abundant genera in bamboo sphere composting comprised Bacillus (0-71.47%), Chloroplast-norank (0-47.17%), Pusillimonas (0-33.24%), Acinetobacter (0-27.98%) and unclassified Sphingobacteriaceae (0-22.62%). Linear discriminant analysis effect size showed that Firmicutes, Thermoascaceae and Actinobacteriota, which have a relationship with the decomposition of soluble organic matter and lignocellulose, were significantly enriched in bamboo sphere treatment. Canonical correspondence analysis illustrated that total organic carbon (TOC), TK, and TP were the most important environmental factors on microbial community succession in the two composting systems. Together these results suggest that bamboo sphere as a reusable amendment can shorten maturity period, improve humification degree, increase the contents of nutrient and contribute to the succession of microbial community during food waste composting. These findings provide a theoretical basis for improving the efficiency of food waste composting.
本研究旨在寻找一种经济有效的改良方法，以提高堆肥性能和产品质量，并分析整个堆肥过程中的微生物群落演替。因此，研究了可重复使用的竹球改良剂对厨余垃圾堆肥过程中堆肥性能和微生物群落演替的影响。结果表明，6%竹球处理的聚合度（3.7）和腐殖化指数（0.18）最高。与对照相比，6%竹球改良剂分别增加了总氮（TN）、磷（TP）和钾（TK）含量 13.61%、19%和 17.42%。此外，竹球通过提高耐热和木质纤维素分解细菌和真菌的相对丰度，增强了细菌-真菌的多样性，并改善了微生物群落组成。竹球堆肥中最丰富的五个属包括芽孢杆菌属（0-71.47%）、叶绿体-未分类（0-47.17%）、短小芽孢杆菌属（0-33.24%）、不动杆菌属（0-27.98%）和未分类的鞘氨醇杆菌科（0-22.62%）。线性判别分析效应量表明，与可溶性有机物和木质纤维素分解有关的厚壁菌门、Thermoascaceae 和放线菌门在竹球处理中显著富集。典范对应分析表明，总有机碳（TOC）、TK 和 TP 是两个堆肥系统中微生物群落演替的最重要环境因素。综上所述，竹球作为一种可重复使用的改良剂，可以缩短成熟时间，提高腐殖化程度，增加养分含量，并有助于厨余垃圾堆肥过程中的微生物群落演替。这些发现为提高厨余垃圾堆肥效率提供了理论依据。
