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The MBR Book: Principles and Applications of Membrane

The MBR Book: Principles and Applications of Membrane

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Glossary <strong>of</strong> terms 315<br />

Relaxation Ceasing permeation whilst continuing to scour the membrane<br />

with air bubbles<br />

Resistance Resistance to flow, proportional to flow rate:pressure ratio<br />

Retentate Water or fluid which is rejected by the membrane<br />

Reversible or Gross solids attached to the membrane surface <strong>and</strong> which<br />

temporary<br />

fouling<br />

can be removed by cleaning relatively easily<br />

Septum Coarse membrane filter<br />

Shear (stress) Force applied to a body which tends to produce a change in its<br />

shape, but not its volume<br />

Shell-side Outside the membrane fibre/filament/lumen<br />

Side-stream Stream outside the bioreactor<br />

Slug flow Air/liquid two-phase flow at moderate air/liquid ratios<br />

Stack See Appendix D<br />

Struvite Magnesium ammonium phosphate salt<br />

Substrate Surface or medium on which an organism grows or is attached<br />

Supernatant Liquid clarified by sedimentation<br />

Isoporosity Property reflecting narrowness <strong>of</strong> pore size distribution<br />

Surface porosity Percentage <strong>of</strong> the surface area occupied by the pores<br />

Sustainable flux <strong>The</strong> flux for which the TMP increases gradually at an<br />

acceptable rate, such that chemical cleaning is not necessary<br />

<strong>The</strong>rmophilic Thriving at relatively high temperatures (49–57°C, 45°C<br />

optimum)<br />

TMP jump Sudden increase TMP when operating under sub-critical flux<br />

conditions<br />

TMP-step Critical flux identification method where TMP is incremen<br />

method tally increased <strong>and</strong> the flux or permeability response recorded<br />

Tortuosity Ratio <strong>of</strong> pore length to membrane thickness<br />

Upflow<br />

clarification<br />

Dynamic clarification by sedimentation<br />

Volumetric mass A combination <strong>of</strong> (i) the overall liquid mass transfer coefficient<br />

transfer <strong>and</strong> (ii) the specific surface area for mass transfer. <strong>The</strong> term<br />

coefficient measures the mass transfer <strong>of</strong> oxygen into the liquid via air<br />

bubbles<br />

Zeta potential Potential (in mV) at the shear plane <strong>of</strong> a solid:liquid interface<br />

� or � factor Factors applied to correct biological aeration dem<strong>and</strong> for<br />

dissolved <strong>and</strong> suspended solids content <strong>of</strong> biomass

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