Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo 315211, China; Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht 6200 MD, The Netherlands.
Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht 6200 MD, The Netherlands.
Bioresour Technol. 2017 Nov;244(Pt 1):132-141. doi: 10.1016/j.biortech.2017.07.118. Epub 2017 Jul 22.
Sewage sludge biodrying is a treatment that uses bio-heat generated from organic degradation to remove water from sewage sludge. Dewatering is still limited during biodrying, due to the presence of extracellular polymeric substances (EPS) in sludge. To study the biodrying mechanism associated with EPS compositions tryptophan and tyrosine degradations, this study investigated the microbial function in sludge biodrying material. This study conducted a taxonomic analysis of biodrying material; determined the most abundant genetic functions; analyzed the functional microorganisms involved in the degradations of tryptophan and tyrosine; and summarized the metabolic pathways. The results indicated efficient degradations of tryptophan and tyrosine were observed during the initial thermophilic phase; functional microorganisms were mainly from the phyla Firmicutes, Actinobacteria, and Proteobacteria, enriched with genes involved in amino acid transport and metabolism. These findings highlight the potentially important microorganisms and typical pathways that may help improve dewaterability during biodegradation.
污水污泥生物干化是一种利用有机降解产生的生物热去除污水污泥中水分的处理方法。在生物干化过程中，由于污泥中存在胞外聚合物（EPS），脱水仍然受到限制。为了研究与 EPS 组成色氨酸和酪氨酸降解相关的生物干化机制，本研究调查了污泥生物干化材料中的微生物功能。本研究对生物干化材料进行了分类分析；确定了最丰富的遗传功能；分析了参与色氨酸和酪氨酸降解的功能微生物；并总结了代谢途径。结果表明，在初始高温阶段观察到色氨酸和酪氨酸的有效降解；功能微生物主要来自厚壁菌门、放线菌门和变形菌门，富含与氨基酸运输和代谢相关的基因。这些发现强调了可能有助于改善生物降解过程中脱水性能的重要微生物和典型途径。
