Walnut Creek WRF Expansion

Georgia’s Henry County, located just 30 minutes south of downtown Atlanta, has witnessed unprecedented population growth. With the associated strain on infrastructure, Henry County Water Authority embarked on an extensive $182 million project to expand wastewater treatment capacity and upgrade treatment processes at the Walnut Creek Water Reclamation Facility.

The 6-mgd expansion is based on a fast-track, 32-month schedule with concurrent construction on more than 20 individual structures. The project incorporates advanced wastewater treatment technologies that will allow Henry County Water Authority to treat wastewater to acceptable levels for discharge into the South River. A new membrane biological reactor (MBR) treatment plant combined with an Autothermal Thermophilic Aerobic Digestion System (ATAD), and a Solar Sludge Dryer that one of the largest of its kind on the East Coast, are among the solutions that will set this facility up for long-term operational and environmental excellence.

New facilities include chemical storage facilities, two plant drain pump stations, a compliance laboratory building, a 14-mgd and 6-mgd MMADF headworks, an autothermal aerobic digester (ATAD) facility, a solids dewatering building and blending tank, and a solar drying system. Additional work includes an upgrade to the existing influent pump station; installation of an MBR treatment process and ultraviolet disinfection system; a new plant electrical building; and the incorporation of a new plant water system, low-profile cascade aeration system and effluent outfall line in addition to multiple ancillary structures.