Index
SBR-plant 130
SDI 50
Seasonal variations 181
Secondary settling 164
Secondary settling tank 220, 242
Selection 58
activated sludge plants 59
biofilters 59
Selection mechanisms 59
Selector 126
Separate denitrifying plant 232
Separate nitrification 196
Separate process 230
Separate sludge 209, 210, 241
Separation unit 242
Settleable solids 38
Settling 289
Settling behaviour 210
Settling characteristics 60
Settling tank 212, 245, 254
Sewage fungus 180
Simultaneous precipitation 336, 340,
343
Single sludge treatment plants 209
Size fraction 183
Slime 167
Sloughing off 169, 179, 180
Sloughing off of biological film 270
Slowly degradable 262
Sludge 252
Sludge age 123, 198, 211
Sludge blanket plants, anaerobic
wastewater treatment 291
Sludge blanket process 291
Sludge composition 265
Sludge concentration 120, 221
Sludge density 50
Sludge dewatering 221
Sludge load 69, 219
Sludge loading 121
Sludge percentage 50
Sludge production 122, 166, 213,
214,249
Sludge properties 215
382
Sludge retention time 255
Sludge stabilization 219
Sludge volume index 50
Soft water 222
Soil pond 343
Solubility index 38
South Africa 229, 245
Specific biomass 153
Specific surface 153, 236
Sphaerotilus Natans 57, 180
Stabilization tank 211
Standard values 264
Starch 241
Start-up, anaerobic plants 304
Stirring 253
Stoichiometric coefficient 64, 158, 196,
232,234
Stone media 167, 218
Submerged filter 161, 169, 217, 255
241,270
Submerged filters/rotating discs with recycle 252
Substrate dependency 222
Sulphate 269
Sulphide 269
Super saturation 181, 255
Supernatant 221, 244
Surface structure 154
Surface structure of the biofilm 152
Surface water 229
Surplus sludge 242
Suspended biofilm reactor 172
Suspended matter 262
Suspended solids 37, 182, 265
SVI 50
T
Tannery 224
Tar production 224
Technical conditions, biofilters 179
Temperature 198,213
Temperature change 261
Temperature dependency 72, 216
Three-phase system 167