Impact of the volume of rain water on the operating constraints for a treatment plant

The new regulations require an increased amount of treatment of stormwater and a reduction of pollution loads discharged into the natural surroundings to be considered. Drainage systems therefore and particularly wastewater treatment plants sho uld be sized correctly to cope with these peaks. Using a simulation softwar e of wastewater treatment plant with activated sludge, such as SIMBAD, enab les us to check that planned structures are appropriate in relation to the effluent quality requirements laid down, and to fix the most appropriate op erating procedures. Operating constraints on a plant for treating stormwate r are not negligible. It is advisable to allow for increased sludge product ion, O-2 requirements and also sludge quality (fermentability). (C) 1999 IA WQ Pblished by Elsevier Science Ltd. All rights reserved.