Carbon sources are essential for biological phosphorus removal (BPR); the carbon sources, however, are often inadequate in municipal wastewater treatment plants. This study demonstrated the feasibility of sludge fermentation liquid enhanced by biosurfactant alkylpolyglycosides (APG) as carbon sources to improve the performance of BPR in the novel oxic/extended idle (O/EI) reactor and the underlying mechanism was also investigated. The results showed that APG induced fermentation liquid could enhance the BPR performance in the O/EI reactor, and the BPR efficiency was 95.2%, which was significantly higher than that in the conventional anaerobic/oxic (A/O) reactor. Mechanism investigation showed that compared with the A/O reactor, the O/EI reactor enriched more polyphosphate accumulating organisms (PAOs) (38.2%), but less glycogen accumulating organisms (GAOs) when the APG-induced fermentation liquid was used as carbon source. The transformations of the polyhydroxyalkanoates (PHA) and glycogen in the O/EI reactor were lower than those in the A/O reactor. Further study found that the activities of polyphosphate kinase (PPK) and acetyl-CoA synthases (ACS) in the O/EI reactor were significantly higher than those of the A/O reactor, which was consistent with the higher BPR efficiency in the O/EI reactor.

中文翻译：

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污泥发酵发酵液在新型好氧/延长闲置工艺中增强生物除磷的可行性

碳源对于生物除磷 (BPR) 至关重要；然而，城市污水处理厂的碳源往往不足。本研究证明了以生物表面活性剂烷基聚糖苷（APG）为碳源增强污泥发酵液以提高新型有氧/延长闲置（O/EI）反应器中BPR性能的可行性，并研究了其潜在机制。结果表明，APG诱导发酵液可以提高O/EI反应器的BPR性能，BPR效率为95.2%，明显高于常规厌氧/好氧（A/O）反应器。机理研究表明，与 A/O 反应器相比，O/EI 反应器富集了更多的聚磷酸盐积累生物（PAOs）（38.2%），但以APG诱导的发酵液为碳源时，糖原积累生物（GAOs）较少。O/EI 反应器中聚羟基链烷酸酯 (PHA) 和糖原的转化率低于 A/O 反应器中的转化率。进一步研究发现，O/EI反应器中多磷酸激酶（PPK）和乙酰辅酶A合酶（ACS）的活性显着高于A/O反应器，这与O/EI反应器中较高的BPR效率一致。 EI反应器。