Coal Fired Power Plant And ZLD For FGD Wastewater

The Facility
Illinois' City of Springfield's Dallman Power Station's three coal-fired units and soon to be installed fourth unit, are equipped with flue gas desulfurization (FGD) systems (scrubbers) to control sulfur dioxide (SO2) emissions.

The Problem
A sharp increase in boron concentration in the FGD wastewater required that The City of Springfield Office of Public Utilities and the Illinois Environmental Protection Agency develop a boron mitigation strategy to remove the boron from the waste streams at the power generation facility. This meant including a new FGD wastewater treatment (Zero Liquid Discharge or ZLD) plant for the power plant. The elevated boron levels are caused from ammonia carryover due to the Dallman Unit's Selective Catalytic Reduction (SCR) systems' nitrogen removal process.