Activated sludge.
D011232:Chemical Precipitation; D007220:Industrial Waste; D007700:Kinetics; D008433:Mathematics; D008722:Methods; D008962:Models, Theoretical; D009584:Nitrogen; D010100:Oxygen; D010758:Phosphorus; D012212:Rheology; D012498:Sanitary Engineering; D013696:Temperature; D014871:Water Microbiology; D014876:Water Pollution; D014877:Water Pollution, Chemical
D007220:Industrial Waste; D010758:Phosphorus; D009584:Nitrogen; D010100:Oxygen