Anaerobic processes.
D000383:Agriculture; D000693:Anaerobiosis; D007220:Industrial Waste; D008660:Metabolism; D009566:Nitrates / Q000032:analysis; D012037:Refuse Disposal; D012722:Sewage; D012988:Soil Microbiology; D014871:Water Microbiology
D007220:Industrial Waste; D009566:Nitrates; D012722:Sewage