Activated sludge.
D000332:Aerobiosis; D003365:Costs and Cost Analysis; D007220:Industrial Waste; D008670:Metals / Q000494:pharmacology; D009584:Nitrogen / Q000302:isolation & purification; D010758:Phosphorus / Q000302:isolation & purification; D012722:Sewage; D014871:Water Microbiology
D007220:Industrial Waste; D008670:Metals; D012722:Sewage; D010758:Phosphorus; D009584:Nitrogen