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MBRs remove pathogens primarily through size exclusion by the membrane and dynamic fouling layer, entrainment within the activated sludge flocs, and subsequent wasting and biological degradation in the activated sludge, complicating LRV determination.
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What commercially-available immersed MBR membrane products are on the market for wastewater treatment? What is their structure, materials, pore sizes, dimensions and air scour rates, plus panel sizes and module sizes including area and volume footprints?
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Water reuse refers to the reclamation, purification and reuse/recycling of wastewater from municipal or industrial processes. There are three types of water reuse applications: non-potable reuse, indirect potable reuse, and direct potable reuse.
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The 37 MLD MBR at Woolston, UK, is an example of an imaginative plant design for an intensive process technology being implemented within a very small footprint. We were shown round the site to look at all the various inter-connected elements first-hand.
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An off-grid wastewater treatment system for use in informal settlements was tested over an 18-month period. The NEWGenerator is based on an anaerobic sidestream MBR with downstream processes, all powered by photovoltaic cells mounted on the roof.
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The membrane-aerated biofilm reactor (MABR) − like the ZeeLung MABR − is a fixed film process where the biofilm is fed with oxygen via the membrane on which the biofilm sits. It is a version of a fixed film process rather than a suspended growth one.
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Simon Judd presents a summary of the MBR and MABR platform and poster presentations from the Singapore International Water Week (SIWW21), held online between 21 June and 2 July 2021.
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The design of a centralised unit to control the complete multi-step process in a WWTP is the job of the systems integrator. The SI is responsible for linking the individual control systems, as well as the commissioning and start-up of the installed plant.
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The challenge posed by micropollutants and pathogens is of huge interest. Our online discussion event, attended by 30 people from across the world and hosted by Graeme Pearce and Simon Judd, in April 2021 assessed the current status. Read our full report.
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Some clogging occurs in most MBR systems regardless of membrane module type or geometry. Prevention or control measures are typically considered at the system design level and during operation but even with adequate pre-treatment, clogging can still occur.
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The IFAS-MBR process is less well explored than the MBBR-MBR. It is of interest to establish the performance of the IFAS-MBR when challenged with a variable influent C/N ratio, as this affects nutrient removal and the emission of N2O – a highly active GHG.
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Ragging is a type of clogging, where clogging relates to agglomeration of solids in the membrane tank. In the case of ragging, filament solids from textile materials join together to form long braids which are mechanically stable in the mixed liquor.
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