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activated sludge activated-sludge plants aeration tank anoxic anoxic zone Arthrobacter bulking control bulking problem bulking sludge cells chlorine Chudoba Cl2 dose completely-mixed contact tank continuously-fed denitrification dissolved oxygen effect effluent Eikelboom experiments Eynde feeding Filament Index filamentous bacteria filamentous bulking filamentous micro-organisms filamentous organisms floc loading floc-forming flow glucose hydrossis influent longitudinal mixing measured Microthrix parvicella mixed liquor ml/g MLSS day nitrification Nocardia non-filamentous oleic acid operation oxidation ditches Palmersford phosphorus pilot plants plug-flow poor sludge settleability Professor Grau Professor Jenkins Protozoa recycle ratio recycled sludge Rensink return sludge settlement tank settling characteristics sludge bulking sludge flocs sludge loading sludge settleability Sludge Volume Index Sphaerotilus natans SSVI Stevenage substrate substrate concentration substrate removal suspended solids Table Tarrant Crawford Thames Water Authority Tomlinson treatment plant values waste water Water Pollution Water Pollution Control Water Research Centre Wessex Water Wessex Water Authority Yorkshire Water Authority