8
Filtration ................................................................................................... 195
8.1 Introduction ....................................................................................... 195
8.2 Depth fi ltration .................................................................................. 196
8.3 Surface (barrier) fi ltration ................................................................... 198
8.3.1
Mechanisms ............................................................................ 198
8.3.2 Rate of fi ltration ...................................................................... 199
8.3.3 Optimization of the fi ltration cycle ........................................... 204
8.3.4 Characteristics of fi ltration cakes .............................................. 205
8.3.5 The role of cakes in fi ltration .................................................... 206
8.4 Filtration equipment ........................................................................... 207
8.4.1
Depth fi lters ............................................................................ 207
8.4.2 Barrier (surface) fi lters ............................................................. 207
8.5 Expression .......................................................................................... 211
8.5.1
Introduction ............................................................................ 211
8.5.2 Mechanisms ............................................................................ 211
8.5.3 Applications and equipment .................................................... 213
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