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Project No.: 0172.07.029.030 DISTRIBUTION 

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Project Name: Steam Electric Detailed Study 

TELEPHONE CALL RECORD 

 Outgoing Call 

Date: 12/10/09 Time: 9:30 am EST 

Company Name: Duke Energy’s Miami Fort Generating 

Station

Contact Name: Jim Steiritz 

Phone No.: (513-287-2269)

Name: Kurt Blohm Eastern Research Group 

GENERAL SUBJECT : Duke Energy’s Miami Fort Generating Station Flue Gas Desulfurization (FGD) and FGD Wastewater 

Treatment Systems

 

TOPICS DISCUSSED AND ACTION TAKEN 

On Wednesday, December 9, 2009, I contacted Jim Steiritz of Duke Energy’s Miami Fort Generating Station 

(Miami Fort). I explained to Mr. Steiritz that I was contacting him to collect information regarding the operation 

of the FGD system and the FGD wastewater treatment system at the Miami Fort plant to inform EPA’s decision 

on which plants to sample as part of the effluent guidelines rulemaking for the steam electric industry. I asked 

Mr. Steiritz if he would be able to answer some questions regarding Miami Fort’s FGD system and FGD 

wastewater treatment system. Mr. Steiritz stated that he would be available to answer my questions at 9:30 

A.M. on Thursday, December 10th. 

Mr. Steiritz called me on Thursday, December 10th at 9:30 AM. Tara Thomas and J.R. Wood from the Miami 

Fort plant were also on the call with Mr. Steiritz. The following is a description of what was discussed during 

the call. 

Mr. Steiritz explained that the plant has three generating units (Units 6, 7, and 8). He stated that the plant 

operates wet FGD systems to control sulfur dioxide emissions on Units 7 and 8, and that Unit 6 does not 

exhaust to a wet FGD system. Mr. Steiritz stated that no additives are used in the FGD systems. Mr. Steiritz 

stated that both Units 7 and 8 have associated SCRs which operate on a year-round basis. Mr. Steiritz stated that 

the plant does not have any plans to add a new unit or new FGD systems in 2010. 

Mr. Steiritz confirmed the following description of the FGD wastewater treatment system: Secondary 

hydroclone overflow from the scrubber is sent to an equalization tank where lime is added to promote 

desaturation and the formation of metal hydroxides. Wastewater then flows to the coagulation tank, where 

organosulfide and ferric chloride are added to promote iron coprecipitation and formation of metal sulfides. 

The pH of the coagulation tank is maintained between 8.4 and 8.6 S.U. Flow from the coagulation tank splits 

into two parallel trains consisting of a reaction tank followed by a DensaDeg lamella clarifier. Polymer is 

added to the reaction tank for coagulation and flocculation to improve solids removals. The overflow from both 

clarifiers is combined in the effluent tank, and then transferred to the ash pond. 

Mr. Steiritz stated that the FGD wastewater treatment system was designed by Infilco Degremont, and that 

Miami Fort also hired an engineering firm to help install and construct the treatment system. The FGD 

wastewater treatment system began operating in 2007. 
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Mr. Steiritz stated that the plant is trying to optimize the wastewater treatment system for the removal of 

mercury, but the system also achieves some removal of other heavy metals. Ms. Thomas stated that the plant 

has a limit for mercury in its permit, which basically requires the plant to optimize the wastewater treatment 

system for mercury. Ms. Thomas stated that the plant has no plans of changing the configuration of the 

wastewater treatment system; however, the plant is experimenting with the use of different polymers in the 

clarifiers to optimize mercury removal. Mr. Steiritz stated that the plant’s permit requires Miami Fort to monitor 

and report a long list of metals and parameters from the wastewater treatment system and the ash pond 

effluents. Mr. Steiritz could not recall the concentration of mercury in the effluent from the FGD wastewater 

treatment system, but he stated that the typical mercury concentration in the effluent from the ash pond is 12 

ppt. 

Ms. Thomas stated that the FGD scrubber purge from Units 7 and 8 is sent to the FGD wastewater treatment 

system equalization tank on an intermittent basis. From the equalization tanks, the FGD purge is pumped 

through the treatment system at an average flow rate of 150-200 gpm.