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activated sludge process activated sludge system aeration tank air aeration average biological Biomass loading lb blanket level calculated carbon dioxide characteristics mg/1 chemical clarifier overflow rate component constant Courtesy of Union decreases design point determined diffusion dissolved oxygen dissolved oxygen levels effluent Equation floc floc particle flow rate fraction Henry's law high D.O. increases Influent characteristics Japan kinetics mass transfer mg/l mixed-liquor mixing MLSS concentration MLVSS MLVSS/day mole fraction municipal Newtown Creek nitrification overall oxygen demand oxygen required oxygen transfer oxygen-activated sludge system parameters pilot plant Plant and Treatability range reactor recycle ratio retention secondary clarifier settling characteristics settling velocity sewage sludge blanket sludge production sludge settling solids flux soluble stage substrate substrate removal suspended solids suspended solids concentration TABLE thickening tion treatability studies typical Union Carbide Corporation UNOX System volatile solids volume Wastewater temperature wastewater treatment