Promotion of polyhydroxyalkanoates-producing granular sludge formation by lactic acid using anaerobic dynamic feeding process

文献类型： 外文期刊

第一作者： Xi, Jiaxing

作者： Xi, Jiaxing;Zhang, Huihui;Zheng, Mingxia;Xi, Jiaxing;Zhang, Jinzhong;Fang, Wenjie;Xu, Heng

作者机构：

关键词： Granular sludge; Polyhydroxyalkanoates; Lactic acid; Biopolymers; Anaerobic dynamic feeding process

期刊名称：JOURNAL OF BIOTECHNOLOGY （ 影响因子：4.1； 五年影响因子：3.6 ）

ISSN： 0168-1656

年卷期： 2024 年 395 卷

页码：

收录情况： SCI

摘要： To promote the formation of granular sludge with high polyhydroxyalkanoates (PHAs) synthesis ability, an anaerobic dynamic feeding process (AnDF) was proposed. This process combines the feast-famine mode with an anaerobic plug flow feeding process and involving variations in cycle length and settling time. The effects of lactic acid (LA) content (0 %, 20 %, and 40 % COD) on sludge granulation and PHAs production were investigated using three AnDF reactors (R1, R2, and R3). The results showed that the AnDF process feeding with LA not only effectively promoted sludge granulation but also improved its PHAs synthesis ability. The granules were quickly observed in R3 after 50 days of cultivation, with an average diameter of 0.69 mm. The maximum PHAs content reached 47.0 wt% in R3, representing a 30.09 % increase compared to R1. Additionally, extracellular polymeric substances (EPS)-producing bacteria observed in granular sludge may be the prime drivers of the formation of PHAs-producing granular sludge (PHAGS), which was defined as granular sludge with an average particle size larger than 0.30 mm and PHAs content above 40 % cell dry weight (CDW) of sludge samples.

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