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首页> 外文期刊>RSC Advances >Exploring the potential of curcumin for control of N-acyl homoserine lactone-mediated biofouling in membrane bioreactors for wastewater treatment
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Exploring the potential of curcumin for control of N-acyl homoserine lactone-mediated biofouling in membrane bioreactors for wastewater treatment

机译：探索姜黄素在膜生物反应器中控制 N -酰基高丝氨酸内酯介导的生物污染的潜力

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Biofouling remains a critical issue in membrane bioreactors (MBRs) for wastewater treatment. Thus, exploring novel approaches for biofouling inhibition is of crucial importance. Here, effects of curcumin incorporation in MBR-activated sludge in terms of permeate quality, extracellular polymeric substance (EPS) concentration, an increase in transmembrane pressure (TMP), and N-acyl homoserine lactone inhibition in the initial stage of treatment were investigated. Results showed that TMP of the test MBR (with curcumin) reached a critical level of 40 kPa after 22 days compared to 3 days for the control MBR (without curcumin). Chemical oxygen demand removal efficiencies from the control and test bioreactors permeate were 99% and 97%, respectively. Additionally, total phosphorus and nitrogen removal from both the bioreactors were almost 99%. Quorum sensing inhibition bioassay of MBR-activated sludge suggests that curcumin addition results in inhibition of short-chain AHLs. EPS analysis of the MBR-activated sludge showed that curcumin incorporation led to 14% lower EPS content than that found in the control bioreactor. Confocal microscopy revealed that the lower membrane biofouling in the curcumin-incorporated MBR occurred because of lower biofilm surface coverage (12% for test vs. 82% for control MBR) and average thickness (0.2 μm for test vs. 1.2 μm for control MBR). Field emission scanning electron microscopy images further confirmed the effect of curcumin on biofilm inhibition. The fouled membrane was characterized using Fourier transform infrared spectroscopy, with proteins found to be the major constituents. These results show that curcumin could be a promising agent for controlling quorum sensing-mediated membrane biofouling in MBRs for wastewater treatment.
机译：在膜生物反应器（MBR）中，生物污垢仍然是废水处理中的关键问题。因此，探索抑制生物结垢的新方法至关重要。在这里，姜黄素掺入MBR活化污泥的渗透质量，细胞外聚合物质（EPS）浓度，跨膜压（TMP）的增加和 N -酰基高丝氨酸内酯抑制的影响。治疗的初始阶段进行了调查。结果表明，测试MBR（含姜黄素）的TMP在22天后达到了40 kPa的临界水平，而对照MBR（不含姜黄素）则为3天。从对照和测试生物反应器渗透物中去除化学需氧量的效率分别为99％和97％。另外，从两个生物反应器中去除的总磷和氮几乎为99％。 MBR活化污泥的群体感应抑制生物测定结果表明，添加姜黄素可抑制短链AHL。 MBR活化污泥的EPS分析表明，姜黄素掺入导致EPS含量比对照生物反应器低14％。共聚焦显微镜检查发现，姜黄素掺入的MBR的下部膜生物污损是由于较低的生物膜表面覆盖率（测试 vs。的82％为对照MBR）和平均厚度（测试<0.2> em> vs。 1.2μm（用于对照MBR）。场发射扫描电子显微镜图像进一步证实了姜黄素对生物膜抑制的作用。使用傅立叶变换红外光谱对结垢的膜进行表征，发现蛋白质是主要成分。这些结果表明，姜黄素可能是控制废水处理MBR中群体感应介导的膜生物结垢的有前途的药物。

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