Abstract To meet the challenge of increased sludge generation, shortening of biodrying periods are required. This study assesses a shortened sewage sludge biodrying period of 15 days. The fundamental physicochemical properties of samples from different phases were determined, the functional groups were identified using infrared spectroscopy and the biodrying associated microbial functions were annotated against gene databases. After a 15-day biodrying period, the moisture content, readily degradable carbohydrate, lignocellulose and protein levels were significantly reduced. The distinct attenuation of peaks identified by infrared spectroscopy, indicates that the degradation of most lipids, proteins and polysaccharides in the biodrying matrix had reached equilibration on Day 15 and following this biosynthesis may result in an increased polysaccharide content. However, the biodrying matrix on Day 20 was only partially matured. Firmicutes, Actinobacteria and Proteobacteria were the most ecologically dominant phyla. These ecologically dominant microorganisms were also functionally dominant in biodrying associated metabolic pathways (glycolysis, amino sugar and nucleotide sugar metabolism, starch and sucrose metabolism), as well as containing carbohydrate-active enzyme families. The modified 15-day biodrying period reduced the treatment time and achieved a competent biodrying result without increasing the operating costs. The 15-day treatment would increase the rate of existing systems or decrease the capital cost of new systems.

中文翻译：

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15 天污水污泥生物干燥中的有机物降解和潜在微生物功能

摘要 为了应对污泥产生增加的挑战，需要缩短生物干燥周期。本研究评估了缩短的 15 天污水污泥生物干燥期。确定了来自不同相的样品的基本理化特性，使用红外光谱鉴定了官能团，并针对基因数据库注释了与生物干燥相关的微生物功能。经过 15 天的生物干燥期后，水分含量、易降解的碳水化合物、木质纤维素和蛋白质水平显着降低。红外光谱确定的峰明显衰减，表明大多数脂质的降解，生物干燥基质中的蛋白质和多糖在第 15 天达到平衡，在此生物合成之后可能会导致多糖含量增加。然而，第 20 天的生物干燥基质仅部分成熟。厚壁菌门、放线菌门和变形菌门是最具生态优势的门。这些生态优势微生物在与生物干燥相关的代谢途径（糖酵解、氨基糖和核苷酸糖代谢、淀粉和蔗糖代谢）以及含有碳水化合物活性酶家族中也具有功能优势。修改后的 15 天生物干燥期减少了处理时间并在不增加运营成本的情况下获得了令人满意的生物干燥结果。15 天的处理将提高现有系统的使用率或降低新系统的资本成本。