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The MBR Book: Principles and Applications of Membrane

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Filtrate (ml)<br />

25<br />

20<br />

15<br />

10<br />

5<br />

IIndustrial<br />

activated sludge<br />

Domestic activated<br />

Leachate activated sludge<br />

Case studies 259<br />

0<br />

0 2 4 6 8 10 12 14<br />

Filtration time (min)<br />

Figure 5.40 Leachate biomass filterability vs. other matrices (Robinson, 2005)<br />

Figure 5.41 <strong>The</strong> plant at Bilbao showing the bioreactor towers <strong>and</strong> sidestream membranes<br />

balancing followed by separate denitrification <strong>and</strong> nitrification, with the sludge being<br />

pumped into the airlift UF plant. <strong>The</strong> UF permeate is directed through an activated<br />

carbon vessel before being discharged. <strong>The</strong> biomass (sludge) recirculation rate is controlled<br />

by a variable speed circulation pump where the optimum tubular crossflow

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