Abstract
In this study we evaluated the performance of the full-scale settling tank when the influent temperature rose and the effect of a new baffle to minimalize the deterioration using CFD calculation. A temperature rising of 5 °C inverted the influent and effluent density and make a temperature stratification. The temperature stratification lead to increase of effluent SS concentration more than twice during 4.5 times of HRT. The baffle prevented the warm plume from reaching the outlet weir directly and broke the temperature stratification. Under constant temperature, not rising up, the effluent SS concentration from the baffled settling tank was a little larger, but when the temperature rose up, the effluent SS concentration from the baffled settling tank was much smaller and temporary SS increase continued much shorter.
