Nov 27, 2007

Thermal Oxidation Projects Heat Things Up

Degremont Technologies—Infilco was recently awarded two contracts for fluid beds; the two contracts together are valued at more than $80 million.

Degremont Technologies–Infilco recently was awarded two multimillion dollar contracts for the design and installation of Thermylis High Temperature Fluid Bed (HTFB) systems.

In the U.S., the city of Cincinnati, Ohio, has ordered three thermal oxidation lines to treat 262 dry U.S. tons per day of sludge at their Mill Creek Wastewater Treatment Plant (WWTP), while in Canada, the Duffin Creek WWTP will handle 230 dry U.S. tons per day with two treatment lines for the city of Pickering, Ontario. The two contracts have a combined value of more than $80 million.

In the thermal oxidation process, sludge is directly fed into a hot, fluidized sand bed where water is evaporated and organic materials are combusted, using high temperature to reduce the dewatered sludge by 93% to a much smaller quantity of inert ash (as low as 7%). The process is efficient, odor free and can generate useful heat for the production of process steam or electricity. The superheated steam generated at Duffin Creek will be used in a turbine to drive the fluidization air blower, thus replacing the 800 hp motor that would otherwise be needed. The “green” technology is proven, safe and environmentally friendly.

With two Thermylis system units in operation and two more to be completed by 2009, the Lakeview WWTP in Canada remains the largest thermal oxidation plant in the world, with a capacity of 440 dry U.S. tons per day.