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 reduced from 35.5 kWh to 27 kWh. With about 2,400 annual operating hours and electricity at $0.06 per kWh, annual electricity savings per centrifuge are $1,224. 859-448-2300; www.flottweg.com
Plant reduces costs with the rotary press
Problem: The 300,000 gpd wastewater treatment plant in the town of Boonsboro, Maryland, faced high costs to manage liquid biosolids.
Solution: After pilot-testing two technologies, the plant team selected a Fournier rotary press for its low polymer consumption, high solids capture rate and consistent reliability.
Result: The town expects to reduce biosolids management costs by at least 50%. “I start the press in the morning, and once it’s dialed in, it runs independently throughout the day,” says Jesse Hill, plant operator. “The machine saves costs and provides peace of mind.” The press has streamlined biosolids processing, freed staff for other duties and improved plant efficiency. 418-423-4241; www.fournierindustries.com
Rotary Fan Press provides efficiency and expandability
Problem: The 2 mgd wastewater treatment plant in Eagle Mountain, Utah, needed more efficient dewatering equipment able to process 19 gpm (1,272 dry solids pounds per day) in one eight-hour shift and provide flexibility to accommodate growth.
Solution: The plant team selected the Rotary Fan Press from Prime Solution for its flexibility and proven performance. When the time was right to upgrade its capacity, the team took advantage of the system’s modular design. The manufacturer quickly installed two additional channels, increasing capacity to 57 gpm (3,816 dry solids pounds per day).
Result: “We’ve had a great experience and customer service with Prime Solution,” says Jacob Hansen, plant superintendent. “We’re pleased with how quickly the Prime team installed the upgrade and the great results we see every day. I’ve run every kind of dewatering equipment out there, and the Rotary Fan Press is the cleanest, quietest and coolest.” 269-694-6666; www.psirotary.com
