GROSS SOLID RETENTION EFFICIENCY OF HYDRODYNAMIC SEPARATOR CSOS

The design of combined sewer overflow (CSO) chambers is of critical im portance to the effective retention of pollutants and solids within th e sewer system and such that the impact of aesthetic pollution to wate r courses and bathing beaches is minimized. Recommended designs of CSO chamber include high side weir chambers, stilling ponds and dynamic s eparators in the form of the vortex chamber with peripheral spill weir and the Stormking(R) hydrodynamic separator. This paper describes a p erformance evaluation of the last two types of chamber, carried out wi thin the Water Engineering Laboratory at the University of Sheffield u sing a range of full-scale particulate-condoms, sanitary towels, relea se tapes and cotton bud sticks-for a range of hydraulic conditions.