Plastic media 167, 169, 172
Plastics discs 247
Plastics media 218,223
Plug flow 161, 265, 266
filter 235
Polishing ponds 56
Polymerized aluminium chloride 261
Polymerized aluminium salts 332
Polymers 143
Polyphosphate 49
Ponding 168
Ponds 113, 126, 337
Population Equivalent 25
Post denitrification plant 243
Postprecipitation 336, 340, 343
Potato flour factory 185
Precipitates
safety problems 346
Precipitation 315
chemicals 332
Predation 265
Preprecipitation 261, 334, 340, 343
Pretreatment 175
Primary particles 324, 326
Process constants 261
Process matrix 194, 207, 232
activated sludge 114
separate nitrification 197
process of order n 151
Properties, hydrophillic 319
Protein 66
Protozoa 56
Pseudomonas 57
Psychodidae 57
Putrefaction 169
Q
<2h,av 11
<2h,max 11
R
Rain 261
Rate constant
ammonium 200
Index
oxygen 200
Rate limiting substrate 204
Raw water supply 229
Reaction rate 197, 200
Reaction rate constants, aerobic
heterotrophic removal 75
Reaeration 169
Recipient 195
Recommended loading 175
Recycle 175, 179, 181, 261
Recycle of sludge 164
Recycle plant 244
Recycle ratio 165, 174, 244
Redox-processes 157
Redox-zones in biomass 268
Reductant 157
Reduction factor 152
Removal per surface area 157
Removal rates, zero 223
Removals 71
Respiration 249
Respiration rate 51
ammonium oxidation 263
nitrate (NUR) 263
oxygen (OUR) 263
Respiration test 263
Retention time 160, 161, 173
Reverse osmosis 229
Rising sludge 254, 290
Rock trickling filter 216
Rock trickling plant 216
Rocks I stones 173
Rotating disc 156,167,172,177, 195,207,
242,247,270
Rotating disc filters 201, 217, 223
Rotating disc plant 223, 225, 258
Rotational speed 172, 175, 181
Rotifera 57
s
Sand 171
Saturation concentration, oxygen 254
Saturation constant 149,264,265
oxygen 265
381