A system for enhancing an activated sludge process, the system comprising: a wastewater supply line, at least one aeration tank for receiving a flow of wastewater via the wastewater supply line; an oxygen supply line for introducing dissolved oxygen to a population of microorganisms in the aeration tank to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids; a weighting agent impregnation subsystem to form weighted biological flocs, including an impregnation tank equipped with a mixer, a line to direct mixed liquor from the aeration tank to the impregnation tank, a feed hopper containing a virgin weighting agent, which is magnetite, a line to direct the virgin weighting agent from the feed hopper to the impregnation tank; a line to send the weighted biological flocs from the impregnation tank to the aeration tank, a flocculant injection port located downstream from the aeration tank for introducing a flocculant to the mixed liquor; at least one clarifier downstream of the flocculant injection port for separating and collecting the weighted biological flocs from the mixed liquor to provide a secondary effluent and a settled sludge; a return activated sludge subsystem for recycling the majority of the settled sludge to the aeration tank; a weighting agent recovery subsystem for removing and shearing the remaining settled sludge and recovering the weighting agent therefrom and reintroducing the recycled weighting agent to the impregnation tank of the weighting agent impregnation subsystem wherein the weighting agent recovery subsystem includes an in-line shear mixer for separating the biological flocs from the weighting agent and a single pass wet drum magnetic separator for recovering the weighting agent from the remaining settled sludge and for introducing the recovered weighting agent into the impregnation tank, and a wasting subsystem for wasting the remaining settled sludge of the weighting agent recovery subsystem to control the population of the microorganisms in the mixed liquor; wherein the mixer is adapted to mix the mixed liquor, the virgin weighting agent and the recycled weighting agent in the impregnation tank to impregnate the weighting agent into biological flocs suspended in mixed liquor to form said weighted biological flocs. a wastewater supply line, at least one aeration tank for receiving a flow of wastewater via the wastewater supply line; an oxygen supply line for introducing dissolved oxygen to a population of microorganisms in the aeration tank to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids; a weighting agent impregnation subsystem to form weighted biological flocs, including an impregnation tank equipped with a mixer, a line to direct mixed liquor from the aeration tank to the impregnation tank, a feed hopper containing a virgin weighting agent, which is magnetite, a line to direct the virgin weighting agent from the feed hopper to the impregnation tank; a line to send the weighted biological flocs from the impregnation tank to the aeration tank, a flocculant injection port located downstream from the aeration tank for introducing a flocculant to the mixed liquor; at least one clarifier downstream of the flocculant injection port for separating and collecting the weighted biological flocs from the mixed liquor to provide a secondary effluent and a settled sludge; a return activated sludge subsystem for recycling the majority of the settled sludge to the aeration tank; a weighting agent recovery subsystem for removing and shearing the remaining settled sludge and recovering the weighting agent therefrom and reintroducing the recycled weighting agent to the impregnation tank of the weighting agent impregnation subsystem wherein the weighting agent recovery subsystem includes an in-line shear mixer for separating the biological flocs from the weighting agent and a single pass wet drum magnetic separator for recovering the weighting agent from the remaining settled sludge and for introducing the recovered weighting agent into the impregnation tank, and a wasting subsystem for wasting the remaining settled sludge of the weighting agent recovery subsystem to control the population of the microorganisms in the mixed liquor;