Transforming EBPR: Non-VFA Pathway Success With EOSi’s MicroC® 2000

The Maryland 7.5 MGD treatment plant operates four trains, each consisting of nine reactors. The mixed liquor suspended solids (MLSS) from the four trains flow into a common post anoxic zone(ML1 to ML3) prior to membrane bioreactor (MBR)basins.

Recirculating aquaculture systems (RAS) deliver MBR discharges to Reactor #5A of each train. The process can recirculate the MLSS from Reactor #8to Reactor #1 (a four-stage configuration) or from Reactor #8 to Reactor #3 (a five-stage configuration).

The plant is required to comply with a total phosphorus (TP) discharge limit of 6,820 lbs. per year, corresponding to concentrations of 0.3 mg P/L. The plant is also required to meet a total nitrogen (TN) discharge limit of 4.1 mg N/L, accomplished historically by adding methanol at average rates of 260 and 300 gallons per day (GPD)and to the primary effluent and post anoxic zones respectively, totaling 560-650 GPD of methanol.