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      Mitigation of membrane biofouling in membrane bioreactor treating sewage by novel quorum quenching strain of Acinetobacter originating from a full-scale membrane bioreactor.

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          Abstract

          A novel quorum quenching (QQ) strain, Acinetobacter guillouiae ST01, was isolated from a full-scale membrane bioreactor (MBR) and characterized for its QQ activities. Batch reactor studies at lab-scale showed that A. guillouiae ST01 exhibited higher QQ activity against acyl homoserine lactones (AHLs) with an oxo group compared to those without an oxo group. The organism was then inoculated (10%) in an MBR (Q-MBR) treating sewage over 48 days and was found to reduce quorum sensing (QS) activity by reducing AHL concentrations in the sludge and the biofilm of the Q-MBR. The concentration of polysaccharides was reduced up to 30% in both the biofilm and sludge relative to the control, whereas protein concentrations were reduced by 40% and 47% in the sludge and biofilm, respectively. The Q-MBR fouling rates were halved. These results indicate that A. guillouiae ST01 is a promising strain for biofouling reduction in MBR treating real wastewater.

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          Author and article information

          Journal
          Bioresour Technol
          Bioresource technology
          Elsevier BV
          1873-2976
          0960-8524
          May 01 2021
          : 334
          Affiliations
          [1 ] School of Engineering, Newcastle University, Newcastle NE1 7RU, UK. Electronic address: shamastabraiz2@gmail.com.
          [2 ] School of Engineering, Newcastle University, Newcastle NE1 7RU, UK.
          [3 ] School of Natural and Environmental Sciences, Newcastle University, Newcastle NE1 7RU, UK.
          [4 ] Faculty of Engineering and Environment, Northumbria University, Newcastle NE1 8QH, UK.
          Article
          S0960-8524(21)00581-2
          10.1016/j.biortech.2021.125242
          33964813
          3907d319-ab12-4785-9a7e-e38ffbb58c55
          History

          Acyl homoserine lactone,Acinetobacter guillouiae,Quorum sensing,Quorum quenching,Membrane bioreactor

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