添加高铁酸钾作为替代预处理方法以提高废活性污泥中短链脂肪酸的产量。
Potassium ferrate addition as an alternative pre-treatment to enhance short-chain fatty acids production from waste activated sludge.
机构信息
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
出版信息
Bioresour Technol. 2018 Jan;247:174-181. doi: 10.1016/j.biortech.2017.09.073. Epub 2017 Sep 11.
A potentially practical technology based on ferrate (VI), i.e. potassium ferrate (PF), pretreatment integrated into waste activated sludge (WAS) anaerobic fermentation has been presented to greatly enhance short-chain fatty acids (SCFAs) production with a shortened fermentation time. The maximum production of SCFAs, 343mg chemical oxygen demand/g volatile suspended solid with acetic acid proportion of 48.2%, was obtained with PF dosage of 56mg Fe(VI)/g total suspended solid within 5days, which was increased to 5.72times compared to that of control. The mechanism study showed that PF accelerated the release rate of both intracellular and extracellular constituents. And the activities of key hydrolytic enzymes were much improved with PF addition. Moreover, PF positively enriched the abundance of microorganisms responsible for WAS hydrolysis and SCFAs production, especially acetic acid-forming characteristic genera such as Petrimonas, Fusibacter and Acetoanaerobium. Besides, the incubation time of acidogenesis and methanogenesis were separated by PF.
一种基于高铁酸盐（VI），即高铁酸钾（PF）的潜在实用技术，已被提出用于强化废活性污泥（WAS）厌氧发酵，以缩短发酵时间并大幅提高短链脂肪酸（SCFAs）的产量。在 5 天内，PF 投加量为 56mgFe(VI)/g 总悬浮固体时，SCFAs 的最大产量为 343mg 化学需氧量/g 挥发性悬浮固体，其中乙酸比例为 48.2%，与对照组相比增加了 5.72 倍。机理研究表明，PF 加速了细胞内和细胞外成分的释放速率。并且，PF 的添加极大地提高了关键水解酶的活性。此外，PF 还积极富集了与 WAS 水解和 SCFAs 生成相关的微生物的丰度，特别是产乙酸特征属如 Petrimonas、Fusibacter 和 Acetoanaerobium。此外，PF 还可以将产酸和产甲烷的时间分开。
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