Improved interception of combined sewage in the Trondheim-Hovringen wastewater system

This paper describes some results of an integrated model development and it s application to the Hovringen wastewater system in Trondheim, Norway. Majo r model development needs concern the integration of sewage production, tra nsport and treatment simulation, the interface with existing databases and the possibility of simulating processes that are controlled in real time. T he developed integrated model has been used to design the treatment process as well as static and dynamic measures in both the catchment and the sewer system. These measures include extended pumping, adjustment of overflows, separation of storm water runoff from "non-effective separate systems", ret ention and real-time control of the sewer tunnel volume. (C) 1999 IAWQ Publ ished by Elsevier Science Ltd. All rights reserved.