title: Denitrification in granular carbon and sand columns.
mesh_terms: D002244:Carbon; D055598:Chemical Phenomena; D002621:Chemistry; D009584:Nitrogen; D012722:Sewage; D012822:Silicon Dioxide; D013997:Time Factors
chemical_list: D012722:Sewage; D002244:Carbon; D012822:Silicon Dioxide; D009584:Nitrogen