Rehabilitation and expansion of sludge facilities, including a new blend tank, new membrane covers for the existing three anaerobic digesters, a new anaerobic digester, new external pump mixing systems for all four digesters, new gravity belt thickeners, three new high solids centrifuges and new polymer system.Full-scale testing of multiple carbon sources for the ENR process.Installation of 8,800 feet of new 96-inch diameter outfall increased discharge capacity to 150 mgd.

In 1998, the Amelia Sanitary District received the Wastewater System of the Year award for outstanding performance from the Virginia Rural Water Association. Hydraulic modeling of both interceptor and outfall identified the need for a second outfall. After Amelia WWTP replaced its pond and lagoon system with the CSBR process, it consistently has met regulatory limits while significantly increasing plant efficiency.

BioWinв„ў modeling was used to optimize facility design and determine how the plant would perform under a wide range of flow conditions.

BNR facilities were designed to meet a total nitrogen limit of 5 mg/L, with the flexibility to meet even lower limits as regulatory requirements evolve.

The BioWin model was used to determine facility design and predict how the plant would perform under various flow conditions. Process optimization included bench-scale modeling to confirm initial wastewater characteristics and determine parameters for input into the BioWin BNR model.

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