Rotating disks with biological growths prepare wastewater for disposal or reuse.
D000641:Ammonia; D002244:Carbon; D005374:Filtration; D010084:Oxidation-Reduction; D012498:Sanitary Engineering; D012722:Sewage; D014481:United States; D014876:Water Pollution / Q000517:prevention & control*
D012722:Sewage; D002244:Carbon; D000641:Ammonia