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Features - Membrane operation

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Membrane technology in controlling micropollutants and pathogens

Membrane technology in controlling micropollutants and pathogens

The challenge posed by micropollutants and pathogens has been the subject of considerable interest over the past few decades. Our online event 'Discussing membrane technology: micropollutants and pathogens' event was held on 14 April 2021, in which Simon Judd and Graeme Pearce hosted a discussion with 30 delegates worldwide on the subject.

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Membrane operation|Process biology|Water quality and treatability|Conferences and events

Clogging mitigation through MBR membrane module design

Clogging mitigation through MBR membrane module design

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. Examples include fine screening of raw wastewater and rescreening of mixed liquor. But even with adequate pre-treatment, clogging can still occur and require remediation protocols and/or specialist equipment.

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Membrane operation|Feasibility, optimisation and costs

The integrated fixed-film activated sludge membrane bioreactor (IFAS-MBR): comparison with a regular MBR for nutrient removal

The integrated fixed-film activated sludge membrane bioreactor (IFAS-MBR): comparison with a regular MBR for nutrient removal

The IFAS-MBR process is less well explored than the MBBR-MBR configuration. It is of interest to establish the performance of the IFAS-MBR when challenged with a variable influent C/N ratio, since this affects both nutrient removal and the emission of N2O – a highly active greenhouse gas (GHG).

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Membrane operation|Alternative membrane technologies and applications

Ragging in MBRs − how do rags form?

Ragging in MBRs − how do rags form?

Ragging is a type of clogging, where clogging relates to agglomeration of solids in the membrane tank. In the case of ragging, the filament solids from textile materials join together to form long rags or braids. These rags, which may contain filaments no more than a few mm in length, are mechanically stable in the mixed liquor and can block the inlet channels of the membrane module and/or wrap themselves around the infrastructure of the membrane tank – including the aerators.

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Membrane operation|Process biology

At what cost? MBR capital and operating expenditure − the impact of labour

At what cost? MBR capital and operating expenditure − the impact of labour

It is most often assumed that the main cost associated with operating a membrane separation plant relates to the energy consumption, followed by the membrane replacement. Consequently, considerable efforts have been devoted to fouling control and mitigation, with more than one fifth of all MBR research literature publications devoted to this topic (Judd, 2017).

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Membrane operation|Feasibility, optimisation and costs