The bioaugmentation effect of microbial inoculants on humic acid formation during co-composting of bagasse and cow manure,Environmental Research

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The bioaugmentation effect of microbial inoculants on humic acid formation during co-composting of bagasse and cow manure
Environmental Research ( IF 7.7 ) Pub Date : 2024-03-26 , DOI: 10.1016/j.envres.2024.118604
Mengling Lu ₁ , Yuhao Hao ₁ , Binfeng Lin ₁ , Zhi Huang ₁ , Yu Zhang ₁ , Liang Chen ₁ , Kai Li ₁ , Jianbin Li ₂

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The effective degradation of recalcitrant lignocellulose has emerged as a bottleneck for the humification of compost, and strategies are required to improve the efficiency of bagasse composting. Bioaugmentation is a promising method for promoting compost maturation and improving the quality of final compost. In this study, the bioaugmentation effects of microbial inoculants on humic acid (HA) formation during lignocellulosic composting were explored. In the inoculated group, the maximum temperature was increased to 72.5 °C, and the phenol-protein condensation and Maillard humification pathways were enhanced, thus increasing the HA content by 43.85%. After inoculation, the intensity of the microbial community interactions increased, particularly for fungi (1.4-fold). Macrogenomic analysis revealed that inoculation enriched thermophilic bacteria and lignocellulose-degrading fungi and increased the activity of carbohydrate-active enzymes and related metabolic functions, which effectively disrupted the recalcitrant structure of lignocellulose to achieve a high humification degree. Spearman correlation analysis indicated that of the phylum, of the phylum, and eleven genera of were the main HA producers. This study provides new ideas for bagasse treatment and recycling and realizing the comprehensive use of resources.

中文翻译：

微生物接种剂对甘蔗渣与牛粪共堆肥过程中腐殖酸形成的生物强化作用

难降解木质纤维素的有效降解已成为堆肥腐殖化的瓶颈，需要采取策略来提高甘蔗渣堆肥的效率。生物强化是促进堆肥成熟和提高最终堆肥质量的一种有前景的方法。在这项研究中，探讨了微生物接种剂对木质纤维素堆肥过程中腐殖酸（HA）形成的生物增强作用。接种组最高温度提高至72.5℃，酚蛋白缩合和美拉德腐殖化途径增强，HA含量增加43.85%。接种后，微生物群落相互作用的强度增加，特别是真菌（1.4 倍）。宏观基因组分析表明，接种丰富了嗜热细菌和木质纤维素降解真菌，增加了碳水化合物活性酶的活性和相关代谢功能，有效破坏了木质纤维素的顽固结构，实现了较高的腐殖化程度。 Spearman相关分析表明，门、门、11属是HA的主要生产者。该研究为甘蔗渣处理和资源化、实现资源综合利用提供了新思路。

更新日期：2024-03-26

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