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15 days 30 lags 9 days activated sludge process activated sludge systems aeration basin autocorrelation bacterial bioflocculation biological solids biomass Bisogni and Lawrence bulking sludge chi-square distribution clarifier COD at SRT coefficients of variation Comparative graph completely mixed concen days and 30 days SRT decrease Dispersion as function dispersion number Effluent COD effluent quality Effluent SS effluent suspended solids effluent variability factors Figure 36 Figures 17 filament length floc flocculation increase Influent and Effluent low frequency mg/l microbial microbial population microorganisms mixed cultures mixed liquor ml/g Nalgene number of lags observed operation organic loadings overflow rate oxygen parameters percent dispersion performance pH at SRT polymer settleability settling characteristics settling properties Sezgin sludge volume index solids retention spectra at SRT spectrum analysis SRT's SS concentration steady-state substrate suspended solids concentration tion tivated total variance treatment plants variability of settling wastewater zone settling velocity