Millcreek WWTP Preliminary/Primary (Grit) Treatment Improvements

Ribway was selected by the MSD of Greater Cincinnati as the prime design and construction management consultant for this project, which included improvements to the existing raw sewage pumping facilities; replacement of the existing detritor grit removal facilities with new vortex type grit removal and unloading facilities designed for 430mgd; total rehabilitation of the primary treatment system also rated for 430mgd; and new odor control, sampling and metering facilities. The new Grit Removal Facility (GRF) consists of six (6) 90mgd capacity vortex type grit tanks; six (6) grit washers; twelve (12) grit transfer pumps; a 15,000sf grit tank building; a 7,600sf grit container building; a 400sf electrical building with 5,000 Amp Switchgear and 3,750 KVA dual unit substation; and an Odor Control System consisting of three (3) 12,000cfm fans with 25ft tall carbon adsorption towers. A green roof was incorporated in the grit tank building structure. Improvements to the Primary Treatment Facilities included concrete tank repairs, new sludge and skimmings collection equipment for 8 tanks, new skimmings pumping equipment (2 pump stations) and new skimming thickening equipment for 2 tanks.