CASE STUDY —FGD SYSTEM DESIGN TO MANAGE SULFATE IN WASTEWATER DISCHARGE

摘要

A utility in Indiana (NIPSCO) was required to install a flue gas desulfurization (FGD) system atits Rollin M. Schahfer Generating Station (RMSGS), Units 14 and 15. The water supply washigh in sulfate, and the National Pollutant Discharge Elimination System (NPDES) permit alsohad a sulfate limit. Using the FGD mass balance and plant data, the FGD system was designed sothat the plant will discharge less sulfate in the future than before adding the FGD, and willconserve water. The paper describes the process of evaluating a spectrum of potential coal blends to select adesign basis, and using the plant water balance and FGD mass balance to design the FGD systemto prevent additional sulfate loading. The final design optimizes the use of reclaimed water andfresh service water to avoid costly wastewater treatment for sulfate.