The ATLAS-DBBR (internal decanted bio balanced reactor) system integrates conventional decanted reactor technology with EDI’s “equilibrium” solids management program to improve the performance capabilities of lagoon-based wastewater treatment systems. Conventional lagoon treatment systems that are experiencing hydraulic or organic overload; inadequate BOD or TSS reduction; poor ammonia conversion; high effluent total nitrogen; or reduced cold weather performance will benefit from the application of the ATLAS-DBBR system.