<br>基于微生物群体感应的丝状藻菌共生机制及调控,Water Environment Research

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基于微生物群体感应的丝状藻菌共生机制及调控
Water Environment Research Pub Date : 2022-02-15 , DOI: 10.1002/wer.10697
Su Kuizu _{1,

2} , Wu Ruiyu _{1,

3} , Zhou Hui _{1,

4} , Wang Wei _{1,

2} , Hao Tianwei ₅

Affiliation

在藻类-细菌共生系统中，藻类和细菌协同工作，减少废水处理过程中的曝气需求和碳排放。然而，传统藻菌共生系统中微生物群落的控制和稳定是复杂且不稳定的。因此，我们在光序批式反应器（PSBR）中开发了一种基于丝状藻类-细菌共生颗粒系统（AB）的新型污水处理系统。外源信号分子（即N-酰基高丝氨酸内酯[AHL]）用于促进藻类-细菌聚生体的形成。研究了成熟藻类-细菌颗粒菌群的特性和性能，然后与相同操作条件下的活性污泥（AS）系统进行了比较。在动态协同研究中，即使没有曝气，化学氧化需量 (COD) 去除效率也大于 90%。然而，添加 AHL（5、50 和 200 nmol/L）对治疗效果的影响可以忽略不计。在静态条件下，10 ^-9 nmol/L 的 AHL 可以显着调节藻菌共生系统，AHL (<50 id=68>4 ⁺去除效率高达 90%。此外，AHL 的添加增强了多糖的分泌但与AS系统相比，AB系统在污染去除效率和微生物多样性增强方面表现出良好的前景。

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Mechanism and regulation of filamentous algal-bacterial symbiosis based on microbiological quorum sensing

In algae-bacteria symbiotic systems, algae and bacteria work cooperatively to reduce aeration demand and carbon emissions during wastewater treatment. However, controlling and stabilizing microbial communities in the conventional algae-bacteria symbiotic systems are complicated and unstable. We, therefore, developed a novel sewage treatment system based on a filamentous algae-bacterial symbiotic granule system (AB) in a photo-sequencing batch reactor (PSBR). The exogenous signal molecules (i.e., N-acyl-homoserine lactones [AHLs]) were applied to promote the algae-bacteria consortia formation. The characteristics and performance of the mature algae-bacterial granular consortia were investigated and then compared with that of the activated sludge (AS) system under identical operating conditions. The chemical oxidation demand (COD) removal efficiencies were greater than 90% in the dynamic synergistic investigation, even without aeration. However, the addition of AHLs (5, 50, and 200 nmol/L) had a negligible effect on treatment performance. In static conditions, 10⁻⁹ nmol/L of AHLs can significantly regulate the algae-bacteria symbiotic system, and AHLs (<50 nmol/L) improved COD and NH₄⁺ removal efficiencies by up to 90%. Moreover, the addition of AHLs augmented polysaccharide secretion but had little effect on protein secretion. In comparison to the AS system, the AB system demonstrated promise in terms of pollution removal efficiency and microbial diversity enhancement.

更新日期：2022-02-15

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