Development of Chemical Precipitation Purchased Equipment Costs:

Sludge

Purchased Equipment Costs are the sum of the following cost elements:

(1) Pump Costs

(2) Tank Costs

(3) Chemical Feed System Costs

(4) Mixer Costs

(5) Clarifier Costs

(6) Filter Press Costs

(7) Sand Filter Costs

Each cost component includes the cost of freight and associated ancillary equipment such as piping, valves, and 

controllers.

This Excel workbook supports EPA's derivation of cost elements (1), (2), and (6) using information provided in response to 

the Steam Electric Survey.

The following worksheet presents EPA's determination of the sludge factor, a ratio relating design sludge flow to FGD 

Wastewater Treatment Flow, gpm (assuming wastewater treatment operations 24 hours per day and 365 days per year). 

EPA obtained design sludge flow from supplemental diagrams and engineering reports provided by plants in response to 

the Survey. After reviewing the available data and eliminating questionable data, EPA selected a sludge factor of 0.4. The 

sludge factor is used for the calculation of pump, tank, and filter press costs.
 valves, and 

rovided in response to 

udge flow to FGD 

d 365 days per year). 

plants in response to 

dge factor of 0.4. The 
Plant ID Plant Name cbi_Sludge_Flow_Rate

1381 EME Homer City Generation L.P. TRUE

7785 Seminole Generating Station FALSE

9225 Fort Martin Power Station TRUE

4237 Brandon Shores FALSE

103 W. H. Sammis Plant FALSE

14 Gibson Generating Station TRUE

1402 Conesville FALSE

6283 Pleasant Prairie Power Plant FALSE

9805 PPL Montour TRUE

4122 PPL Brunner Island TRUE

EPA selected a median sludge factor of 0.4.
Sludge flow rate (clarifier 

to sludge tank or filter 

press), gpm cbi_WFGD_water_gen_tbl

FGD Wastewater 

Treatment Flow, gpm

Sludge flow 

rate/Purge 

flow rate

[Redacted] TRUE [Redacted] [Redacted]

50 FALSE 421 0.12

[Redacted] FALSE 178 [Redacted]

78 FALSE 502 0.16

77.6 FALSE 183 0.42

[Redacted] FALSE 149.8458333 [Redacted]

62 FALSE 156.7291667 0.40

17 FALSE 40 0.44

[Redacted] FALSE 116.6666667 [Redacted]

[Redacted] FALSE 116.6666667 [Redacted]

Min [Redacted]

Max [Redacted]

Average 0.36

Median 0.40
Notes

[Redacted]
[Plant-specific information has been redacted from this tab to prevent disclosure of material for which a claim of confidential 

information has been made.]
l for which a claim of confidential business 


[Plant-specific information has been redacted from this tab to prevent disclosure of material for which a claim of confidential 

information has been made.]
l for which a claim of confidential business 


[Plant-specific information has been redacted from this tab to prevent disclosure of material for which a claim of confidential 

information has been made.]
l for which a claim of confidential business 






[Plant-specific information has been redacted from this tab to prevent disclosure of material for which a claim of confidential 

information has been made.]
l for which a claim of confidential business 
[Plant-specific information has been redacted from this tab to prevent disclosure of material for which a claim of confidential 

information has been made.]
l for which a claim of confidential business