Field Applications page

Arkea® Bioaugmentation & Sludge Management


Customer is a northeast WWTP with a 4.0 MGD average and an 8 MGD design flow. The influent primarily consists of domestic wastes. The flow is routed through grit removal to the Orbal oxidation ditch (activated sludge), which was constructed relatively recently. Additional flow (over 4.0 MGD) is directed through the older RBC portion of the treatment plant, which is currently not being used.

The Orbal oxidation ditch has the characteristic of simultaneous nitrification /denitrification in the outer ring where the D.O. level is held at < 0.5 mg/L.

There are two large secondary clarifiers with the potential option of utilizing two additional secondary clarifiers located in the RBC portion of the plant. Sludge is wasted to 8 aerobic digesters of which only 4 were being used at the start of Arkea® treatment.

Customer Problems/Challenges

Customer’s goal was the reduction of high operational costs associated with sludge management, including energy, chemicals, dewatering, transportation, tipping fee, and landfill disposal costs.

ArchaeaSolutions, Inc. Strategy

ArchaeaSolutions, Inc. used Arkea® bioaugmentation and process consulting to reduce sludge yield and improve digester operational efficiency.


Over a 3 year period, the plant has seen a 22.3% reduction in the average sludge yield year to year. This reduction has resulted in a decrease of related operational costs, as well as improved digester operational efficiency, allowing the customer to take 1 of the 4 digesters offline for additional energy savings.

The graphs below show the reduction of the sludge yield even with a significant increase in cBOD loading since Arkea® treatment began.