The magnitude of excess particulate Matter seperation from a flocculated suspension at upflow settling conditions was predicted from the concentration disti-ibution ofbatch settling data. The settling data pairs were fitted to inod fied polnilation-growth model. Settling sinfaces at ul fiow ol)eration were iucreased by inlaying pi. pes i. nto the column and inclining itfor 50', 60', 70 and 80' coinciding with 0.5563, 0.7152, 1.0,155 and 2.0594 1711771s decreased sui ace hydl-aulic loading rates, resl)ectively. The resl)ective i-emoval i-atios observed at the al)l.died loadings were 0.878, 0.848, 0.7-56 and 0.520, while the coi-resj)onding I)redicted t1ficiencies by n7ean value method lvere 0.865, 0.8_]. 0.773 and 0.512, resl)ectivel y. It was denwustrate,] that rernoval predictions obtainedfi-oin the batch settling tests vvere quite conil)atible with the observed removals of'actual ul)flow o1mration. The investigation also deluonsti'ated that concentration dist)-ibution of batch settling data heads successfully to predict the e-vcess particulate matter removal at ul)flow settling. (c) 2008 American Institute of Chemical Engineers.