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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

IMSTEC 2020: Bushfires, coronavirus and, of course, membranes

The University of Technology in the wonderful city of Sydney, Australia was the venue for the 10th IMSTEC (International Membrane Science & Technology Conference) from 2–6 February 2020. Despite the very real challenges of bushfires and the coronavirus, the organisers – Pierre Le-Clech (University of New South Wales) and Hokyong Shon and Duc Long Nghiem (both of the University of Technology, Sydney), together with their teams of supporting committees and volunteers – delivered a stimulating and well-organised event on behalf of the Membrane Society of Australasia.

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Conferences and events

Channel clogging in membrane bioreactors

Clogging can take place within MBR module channels as a thick deposit which fills the channel (‘sludging’ or ‘localised dewatering’). Sometimes long rags or braids can develop in the tank itself which wrap around the membrane tank infrastructure (‘ragging’ or ‘braiding’). Chemical cleans are largely ineffective since they can only attack the foulants on the membrane surface, so leaving the clogged material filling the membrane channels largely unaltered. Cranfield University and Qatar University have completed work on this largely neglected research area.

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Membrane operation

The disinfection capability of MBRs: credit where credit’s due

Disinfection by MBRs. Unlike regular physical membrane filtration, virus removal by MBRs is not limited to simple size exclusion. Adsorption onto the sludge solids and the membrane cake layer (as well as the membrane itself) represent important removal mechanisms, as well as removal by predation (the feeding on the pathogens by other higher organisms).

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Membrane operation | Process biology | Water quality and treatability