Lagoons and oxidation ponds.
D000332:Aerobiosis; D000383:Agriculture; D000641:Ammonia; D000693:Anaerobiosis; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001419:Bacteria / Q000378:metabolism; D002713:Chlorine / Q000378:metabolism; D003612:Dairying; D004058:Diffusion; D004352:Drug Resistance, Microbial; D056890:Eukaryota / Q000378:metabolism; D005525:Food-Processing Industry; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D008462:Meat-Packing Industry; D009586:Nitrogen Fixation; D010084:Oxidation-Reduction; D012722:Sewage
D000900:Anti-Bacterial Agents; D007220:Industrial Waste; D012722:Sewage; D002713:Chlorine; D000641:Ammonia