Earth Tech has been selected to design a new biosolids facility in Nashville, TN, for the Department of Water and Sewage Services of the Metropolitan Nashville and Davidson County. Earth Tech, a business unit of Tyco International Ltd, and a global provider of consulting, engineering and construction services, will serve as a subcontractor to Archer-Western Contractors, Ltd., a division of the Walsh Group, on the $117 million project.

Earth Tech will provide engineering services during construction; prepare operations and maintenance manuals; and provide staff training; and start up and commissioning services.

The scope of the project includes the design, construction, start up and commissioning of the new solids handling facility. A major part of the project is to design and build the sludge thickening, digestion, dewatering and heat drying facilities that will convert sewage sludge into biosolids for reuse as fertilizer.

The new facility, which will have a maximum capacity of 137 dry tons of sewage solids per day, will reduce odors emanated by the Central Wastewater Treatment Plant by replacing the current practice of land filling raw sludge with the new biosolids drying process.

Earth Tech has assembled a team of talented employees from the United States and Canada to work on the project. The company's Sheboygan, WI, office, will lead the effort, with support from employees in Madison, WI; Chicago, IL; Concord, MA; Toronto, Ontario; Calgary, Alberta; and Vancouver, British Columbia.