DYNAMIC LOADING TESTS FOR FINAL SETTLING TANKS

Dynamic experiments conducted in a pilot scale settling tank at Zurich 's wastewater treatment plant (WWTP) are presented. The experiments we re carried out with real activated sludge. They showed that vertical p erforated walls transverse to the main flow direction are very benefic ial particularly for wet-weather flow. The increase of the effluent su spended solids concentration is significantly dampened with dynamic hy draulic loading. installing several perforated walls enables uniform v elocity profiles to be attained, enhancing flocculation. The total slu dge mass stored in the final settling tank may be increased by this sy stem and requires special attention when the removal system is designe d. Copyright (C) 1996 IAWQ. Published by Elsevier Science Ltd