The Captivator System improves a conventional process by replacing primary clarification and separate sludge thickening with a VLR® Contact Tank and a Folded Flow® DAF applied to the liquid stream. Organic matter is extracted from raw wastewater and sent directly to anaerobic digestion. Since less BOD is sent to the biological aeration tanks, less energy is required by the process. Waste activated sludge is circulated to the aerated VLR contact tank at the front end of the plant. The Captivator System reduces capital investments otherwise required for primary clarification, separate sludge thickening, and normal aeration tank volume.