Decanter replaces belt press at metro plant
Problem: The belt press at the 5 mgd West Central Conservatory District wastewater treatment facility in Indianapolis was achieving average results in terms of percent solids. It used up to 5 gallons of polymer per hour.
Solution: The district replaced the press with two Flottweg C5E decanter centrifuges. Digested sludge from holding tanks is pumped directly into the centrifuges, yielding cake at 18-21% solids before transport to a landfill where it is composted.
Result: The centrifuges use 1.75 gallons per hour of polymer costing $16 per gallon. Based on 24/7 operation, that saves $385,000 per year. Power consumption was
