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Technical features

Showing 2536 of 56 technical features
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Long-term monitoring of its constitution in the full-scale MBR
Feature
04 May 2017

Reducing process aeration energy consumption in MBRs

MBRs use more energy compared with classical activated sludge (CAS) because the aeration requirements are greater. Aeration is needed both for the biological and membrane tanks for degrading the organics and scouring the membrane respectively.

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Rotary drum screens at Kunming
Feature
08 January 2017

Kunming Underground MBR: a Chinese case study

The below-ground installation at Kunming City is an example of one of the largest and most ambitious municipal wastewater MBRs in the world. At an average daily flow capacity of 150,000 m3/d and a peak daily flow of 195,000 m3/d, it is a substantial plant.

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OPEX vs flux at various membrane life periods
Feature
30 September 2016

MBR OPEX − the theory of running costs

Operational costs in MBRs are marginally higher than those of conventional activated sludge (CAS) as permeating water through a membrane demands energy. For the immersed technologies (iMBRs), the overall specific aeration demand (SAD) is higher.

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Responses to our question: In your experience, what is the biggest challenge posed by MBR sludge?
Feature
26 September 2016

The 2016 MBR Survey results

In 2015, we asked 'What’s the main issue with MBRs?' This time our question addresses the topic of sludge − most of your responses from the previous three surveys had been based around this topic so we felt it was worthy of further investigation.

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Membrane technologies with modes of movement: (a) rotating and vibrating disc filters (RDF and VDF), indicating torsional motion; (b) multiple shaft disc (MSD), overlapping; (c) vibrating membrane (e.g. hollow fibre, vibrating hollow fibre membranes (VHFM)) (Zsirai et al, 2016)
Feature
18 July 2016

Mechanical shear in membrane bioreactors

In membrane separation systems, shear is probably the most significant parameter for driving the membrane process. Pressure is important but shear is arguably the property of the system which largely determines the rate of membrane fouling and so the flux.

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a) bubbly flow; b) slug flow; c) annular flow
Feature
07 March 2016

Improving MBR flux: Ultrafiltration with a twist

In autumn 2015, Pentair brought to market its new ‘Helix’ product, an enhancement to X-Flow tubular membrane technology which features a helically-winding ridge on the inside of the membrane designed to tackle cake build-up and enhance flux.

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Filamentous intersections
Feature
15 January 2016

Foaming in MBRs: measurement and evaluation

Foaming of conventional activated sludge (CAS) is very common. It may happen during start-up due to the presence of surfactants, with insufficient biomass to degrade them during the early stages. However, this is normally a short-term issue.

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MBR centre-flow band screen
Feature
12 October 2015

MBR Screening Part 2: Selecting an MBR screen

When selecting a screen for your MBR design (Part 2), things to consider include: the screenings capture ratio (SCR), screen apertures, screening flow velocity, ancillary processes and coarse suspended solids, and screen maintenance.

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