Gallatin Completes Dry Ash Storage Initiative

TVA’s vision for converting all management of coal combustion products from wet to dry storage is becoming a reality—most recently at Gallatin Fossil Plant.

JULY 5, 2016—Gallatin Fossil Plant recently marked a milestone: the first dry coal combustion waste was received in its new landfill.

“This is the third lined landfill we have constructed as part of our commitment to convert all coal ash management from wet to dry,” says John Kammeyer, vice president for Civil Projects and Coal Combustion Products Management. “The two other completed ones are at Bull Run and Kingston; Cumberland, Paradise and Shawnee are in various stages of planning or engineering.”

How It Works

In 2009, TVA committed to convert all wet coal ash management facilities to dry ash management.

At the Gallatin Fossil plant, TVA commissioned a new dry Flue Gas Desulfurization scrubber system that produces dry coal combustion products (CCP) and improves air quality. This dry scrubber features novel integrated desulfurization technology. Each unit includes a bag house containing 9,600 bags along with a pulsed air cleaning system.

“The pulsed air cleans the bags, forcing the particles from the bag down into a hopper where they are collected, and then transferred to a byproduct silo. From the silo, they are transferred by truck to a landfill,” says Larry Nathan, senior project manager for the Gallatin dry scrubber project, which was completed in February of 2016.

The North Rail Loop Landfill, which is located within the Gallatin Fossil Plant property, was constructed specifically to provide storage for the dry CCP produced by this scrubber system. The project included construction of a new asphalt haul road for transportation of CCP from the scrubber to the landfill and the safe removal of 100,000 cubic yards of rock by blasting.

Years in the Making

Permitting began in 2011 with an extensive site investigation to understand the hydrogeology of the landfill site and prepare the required landfill design and permitting documents. The Tennessee Department of Environment and Conservation (TDEC) issued the Class II Solid Waste Disposal Facility permit on June 30, 2014.

Construction of Cell 1 began on August 9, 2014, and was substantially completed on March 11, 2016. TDEC approved the landfill to begin placing CCPs on May 20 of that year, and on June 8 the first waste was received in the new landfill.

The landfill has a liner system consisting of a clay liner two feet thick, a bentonite geosynthetic clay liner and a high-density polyethylene plastic liner. A groundwater monitoring system is in place and will be watched closely over the course of the landfill operation, closure and 30-year post-closure care period.

Cell 1 covers 18.8 acres and provides 1.2 million cubic yards of storage capacity. Construction of the remaining two cells will be completed over the next seven to 15 years as additional storage is needed.

When fully constructed, the landfill will cover 52 acres and will provide capacity to store 6.7 million cubic yards of CCP.