Influent flow equalization regulates and "dampens" surges in wastewater flow. Stringent effluent standards for discharge into Lake Allatoona required the facility to produce a high degree of advanced wastewater treatment. Activated sludge was selected as the biological process. Low-lime treatment in the primary clarifiers for phosphorous removal was selected for the physical/chemical treatment process. Effluent filtration and chlorination complete the treatment process, which discharges plant effluent of higher quality than that of the receiving lake. Sewage sludge is dewatered with belt filter presses and hauled to a local landfill.

ARCADIS provided engineering planning and design services for a 4-MGD expansion to this facility. The expansion included wastewater pumping, both aerated and anoxic tanks for biological nutrient removal, secondary clarification, sludge digestion improvements and additions, ultra-violet disinfection. As a part of this project, a reuse water force main and storage pond was designed and constructed to provide irrigation water to the nearby Cobblestone Golf Course and Northwest Plant's NPDES permit was modified by ARCADIS to provide authorization to operate these effluent disposal facilities. The facility expansion was completed in 1997 at a construction cost of $18 million.

Scope of services:

• Engineering Report
• Field Surveys
• Final Design
• Plans and Specifications
• Construction Administration
• Resident Observation