Case Studies - June 2020

Case Studies - June 2020

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Dewatering centrifuge helps dairy operation get handle on solids disposal

Problem: Bettencourt Dairies in Wendell, Idaho, houses more than 13,000 Jersey dairy cows with a cross-vent barn with a scraper system to convey wastes. At this dairy, each milking cow produces an average of 18 gpd of manure and associated wastewater. Previously, the farm used only conventional slope screens for its primary separation, which removed the coarse material. The farm had to dredge its 200-acre-foot waste lagoon once a year. The facility needed to process and meet its nutrient management plan when it added cross vents and vacuum trucks to move the manure from the barns.

Solution: In 2018, the facility decided to add a Centrisys/CNP CS26-4DT dewatering centrifuge to remove the fines from the manure. “We saw the Centrisys centrifuge as the only piece of equipment that was going to be able to get the solids out of our water,” says Don Brand, Bettencourt Dairies operations manager of equipment and buildings. “The centrifuge seemed like the only piece of equipment that would be able to grow and expand with the operation.”

Result: Without added chemicals, the centrifuge removes most of the solids, typically leaving less than 1% total suspended solids in the effluent manure that previously went into the lagoons. Instead of dredging a few feet of solids from the lagoon, the centrifuge reduces the solids down to only a few inches. Now the farm only has to dredge its waste lagoon every two to three years. The residual manure is 25% total solids and is resold as compost fertilizer. “The Centrisys centrifuge was the first piece of equipment that we bought for manure processing that worked — from the beginning — the exact way it was promised,” Brand says.  262-654-6006;

Receiving station helps ready plant for increased influent load

Problem: Legislation for septic tanks in Florida may lead to increased septage volume at Indian River County’s residuals dewatering (biosolids) facility. Moves are afoot to require inspection and pumping of septic tanks every three to five years.

Solution: The county chose a fully automated Raptor Septage Complete Plant from Lakeside. The compact, self-contained unit compacts and dewaters screenings to 40% solids. An overnight self-cleaning cycle stops the buildup of grit in the bottom of the unit. The system is preengineered, and all-stainless steel construction resists corrosion.

Result: Far more grit and rags are captured than anticipated. A 4-cubic-yard container is filled daily. There have been no equipment issues, and only basic daily maintenance is required. 630-837-5640;  


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