利用厌氧动态进料工艺，通过乳酸促进产生聚羟基烷酸的颗粒污泥的形成。

IF 4.1 2区生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of biotechnology Pub Date : 2024-09-18 DOI:10.1016/j.jbiotec.2024.09.010

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

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引用次数: 0

摘要

为促进形成具有高聚合羟基烷酸酯（PHAs）合成能力的颗粒污泥，提出了一种厌氧动态进料工艺（AnDF）。该工艺将 "盛宴-饥饿 "模式与厌氧塞流进料工艺相结合，并涉及周期长度和沉淀时间的变化。使用三个 AnDF 反应器（R1、R2 和 R3）研究了乳酸（LA）含量（0%、20% 和 40% COD）对污泥造粒和 PHAs 产量的影响。结果表明，投加 LA 的 AnDF 工艺不仅有效地促进了污泥造粒，还提高了其 PHAs 合成能力。在 R3 中，经过 50 天的培养，污泥很快就形成了颗粒，平均直径为 0.69 毫米。R3 中 PHAs 的最大含量达到 47.0wt.%，比 R1 增加了 30.09%。此外，在颗粒污泥中观察到的产生胞外聚合物物质（EPS）的细菌可能是形成产生 PHAs 的颗粒污泥（PHAGS）的主要驱动力，PHAGS 的定义是平均粒径大于 0.30 毫米且 PHAs 含量超过污泥样品细胞干重（CDW）40% 的颗粒污泥。

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

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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来源期刊

Journal of biotechnology 工程技术-生物工程与应用微生物

CiteScore

8.90

自引率

2.40%

发文量

190

审稿时长

45 days

期刊介绍： The Journal of Biotechnology has an open access mirror journal, the Journal of Biotechnology: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The Journal provides a medium for the rapid publication of both full-length articles and short communications on novel and innovative aspects of biotechnology. The Journal will accept papers ranging from genetic or molecular biological positions to those covering biochemical, chemical or bioprocess engineering aspects as well as computer application of new software concepts, provided that in each case the material is directly relevant to biotechnological systems. Papers presenting information of a multidisciplinary nature that would not be suitable for publication in a journal devoted to a single discipline, are particularly welcome.