Optimum quorum quenching bacteria concentration in the better-quality cell entrapping beads to control biofouling in membrane bioreactor.

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2024-02-01 Epub Date: 2024-03-07 DOI:10.1080/08927014.2024.2321964

Jennifer Rose, Shinho Chung, Zia Ul Islam, Bushra Azhar, Heekyong Oh

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Abstract

Quorum quenching (QQ) by cell entrapping beads (CEBs) is known to inhibit biofouling by its biological and physical cleaning effect. Although there are better QQ media reported, due to the ease of fabrication of QQ-CEBs, this study focused on improving the quality of CEBs by comparing two distinct bead-making methods - polyvinyl alcohol-alginate (PVA-alginate) and phase inversion - and on finding the optimum concentration of QQ bacteria in the CEBs. The evaluation of PVA-alginate bead showed better uniformity, and higher mechanical and chemical strength in comparison with the phase inversion bead. Through the operations of two control membrane bioreactors (MBRs) (no bead, vacant bead) and four QQ-MBRs with different Rhodococcus sp. BH4 concentrations (2.5-15 mg cell ml^-1) in PVA-alginate CEBs, the maximum QQ effect was observed by 5 mg ml^-1 BH4 concentration beads. This implies that an optimum cell concentration of QQ-CEBs is crucial to economically improve MBR performance using QQ.

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在质量较好的细胞夹带珠中实现最佳的法定量淬灭细菌浓度，以控制膜生物反应器中的生物污垢。

众所周知，细胞诱捕珠（CEBs）的定量淬灭（QQ）作用是通过其生物和物理清洁效果抑制生物污染。虽然目前已有关于更好的 QQ 培养基的报道，但由于 QQ-CEBs 易于制造，本研究重点通过比较两种不同的珠子制造方法--聚乙烯醇-海藻酸盐（PVA-海藻酸盐）和相反转--来提高 CEBs 的质量，并寻找 CEBs 中 QQ 细菌的最佳浓度。与反相制珠相比，聚乙烯醇-海藻酸盐制珠的评价结果显示其均匀性更好，机械和化学强度更高。通过对两个对照膜生物反应器（MBR）（无珠、空珠）和四个在 PVA-海藻酸盐 CEB 中使用不同 BH4 浓度（2.5-15 毫克细胞毫升-1）的 QQ-MBR 进行操作，观察到 5 毫克毫升-1 BH4 浓度珠的 QQ 效果最大。这意味着，QQ-CEBs 的最佳细胞浓度对于利用 QQ 经济地改善 MBR 性能至关重要。

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