title: Enhanced nitrification by addition of clinoptilolite to tertiary activated sludge units.
mesh_terms: D000538:Aluminum Silicates; D000641:Ammonia / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism; D007474:Ion Exchange; D009566:Nitrates / Q000378:metabolism; D009573:Nitrites / Q000378:metabolism; D010084:Oxidation-Reduction; D012722:Sewage; D012972:Sodium Hydroxide
chemical_list: D000538:Aluminum Silicates; D009566:Nitrates; D009573:Nitrites; D012722:Sewage; D012972:Sodium Hydroxide; D000641:Ammonia