title: Tests for nitrifying and denitrifying ability of activated sludge.
mesh_terms: D001673:Biodegradation, Environmental; D007700:Kinetics; D009584:Nitrogen / Q000378:metabolism*; D000644:Quaternary Ammonium Compounds / Q000378:metabolism; D012722:Sewage; D014871:Water Microbiology
chemical_list: D000644:Quaternary Ammonium Compounds; D012722:Sewage; D009584:Nitrogen