Grit Removal Installation at SC Pollution Control Plant Improves Clarifier, Digester Operation

摘要

Anew grit removal system at the James B. Messerly Water Pollution Control Plant (WPCP) in the city of Augusta, S.C., was installed following rigorous independent testing of grit particle size and settling velocity prior to installation of a new stacked tray system, together with grit washing and dewatering. The new system showed far better removal efficiency, which improved both clarifier and digester operation. The primary clarifier can now be used to thicken the sludge since the grit has been removed. This helps the digester, as less overall sludge volume allows for a longer solids residence time, which has improved volatile solids destruction.