Columbus, Brown and Caldwell set for ‘pioneering’ wastewater acid digestion project

The City of Columbus has engaged a team led by Brown and Caldwell to deliver professional design services for a new and improved acid phase digestion system at its Southerly Wastewater Treatment Plant (SWWTP).

The SWWTP is one of the largest facilities of its kind in the country, situated on 288 acres and serving over 530,000 residents. With an average flow of 120 million gallons per day, its two-phase digestion process consists of two sludge storage silos, six methane phase digesters, and three acid phase digesters (APDs) to produce a Class B biosolids product for land application and other beneficial uses.