DWA Industry Guide Watermanagement, Wastewater-Waste

6.2.28 Combinations of contactor plants, biological filter plants/aeration plants

6.2.29 Compact sewage treatment plants

6.2.33 Nitrification, denitrification

6.2.42 Rotating contactor plants

6.2.46 Biological immersion contactor plants

6.3.1 Chemical Phosphorus Removal