Simon Judd, author of The MBR Book, Watermaths, and Industrial MBRs, offers observations on membrane technology in this occasional blog.

About Simon

Professor Simon Judd lectures at Cranfield University in the UK and Qatar University in the Middle East. He has over 20 years’ experience in teaching the fundamentals of water and wastewater technologies and is an acknowledged expert in membrane bioreactor technology and produced water.

Simon has written a number of text books on water and wastewater treatment, including ‘Watermaths‘, a textbook for undergraduates and practitioners on maths for water and wastewater treatment technologies.

He continues to conduct research into wastewater technologies, specialising in membrane bioreactors and produced water, and provides consultancy on water and wastewater treatment to clients across the globe. Contact Simon at

  • 23 April 2014
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    Imperial units versus Le Système international d’unités (SI units)

    Length, area and volume are expressed in three different units in specific flux. To resolve to a single unit of length would require converting gallons to either cubic feet or cubic inches. Then there’s the concept of ‘pounds force’, force being mass times gravitational acceleration ... Read more

  • 21 March 2014
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    Recalcitrant micropollutants

    Unless they’ve spent the last 10-15 years living in a cupboard, pretty much anyone working in municipal wastewater will at least be aware of the issue of micropollutants: trace quantities of anthropogenic materials which are onerous to the environment. ... Read more

  • 24 November 2011
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    Under the microscope

    Anyone working in wastewater cannot have failed to have noticed the increasing attention being paid to micropollutants. These are substances capable, we are assured, of wreaking havoc on the environment with potentially significant risk to human health. ... Read more

  • 23 July 2011
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    The quality of effluent (and life)

    According to the great Tom Lehrer: “Life is like a sewer: what you get out of it depends on what you put in”. In which case, of course, wastewater treatment reflects life. A big selling point of MBRs is the constant and high wastewater quality – so taken for granted that it hardly features at all in the discussion pages of The MBR Group on LinkedIn. ... Read more

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