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acid activated carbon activated sludge adsorbent adsorption aeration aerobic algae alkalinity anaerobic bacteria biological treatment Ca++ CaCO3 carbon dioxide cell chemical chlorine coagulation coefficient coliform colloidal concentration constant corrosion decomposition depth diameter diffusion digestion discharge disinfection dissolved effluent electrode engineering equation equilibrium example filtration flocculation floe flow gases growth head loss heat hydraulic hydrogen hydrogen sulfide industrial influent ion exchange liquid loading mechanical metal molecules natural nitrogen normally odor operation organic matter oxidation oxygen particles phosphate pipe plants pollution polyelectrolytes ponds precipitation pressure purification ratio reaction receiving waters recirculation reduced relative removal samples sedimentation settling tanks sewage slow sand filters solubility solution specific specific gravity stabilization streams substances sulfate surface suspended solids Table temperature tests tion trickling filters turbidity values volatile volume waste wastewater treatment water and wastewater water quality weight