FGD	WWT	Systems

at	John	E.	Amos	and	

Mountaineer	Plant

November 4, 2014
John	E.	Amos	Plant	– Aerial	View

Gypsum Dewatering

and WWT Plant

FGDs FGD

BAP Complex

FGD Landfill
John	E.	Amos	Plant	WWT– Aerial	View

Gypsum Dewater

CPS WWT Bldg

Dewa

WWT Primary Clarifiers

Equalization Tanks
Amos	‐ FGD	Systems

• Design

& Operation:

• Limestone Forced Oxidation

• B&W Tray/Spray Tower

• Density: 19.5

‐22.5%

• ORP: 100

‐300 mV

• pH: U1&U2 – 5.9; U3 – 6.0

• Chlorides: <8000 ppm

• L/G: ~75• SO

2 Removal: 97%

• Hg Removal: 90+%• Blowdown: U1&U2 – 1200 gpm; U3 – 1900 gpm

• CPS Inlet: 800 gpm
Amos	‐ FGD	Systems
Amos	‐ FGD	CPS	WWT	System

Design	and	Operation
Amos	‐ FGD	CPS	WWT	System

• Design

& Operation

• Original design for solids removal

• Modified for mercury mitigation

• Inlet

• Flow : 807 gpm• Solid Loading: 26,600 lbs dry solid/hr

• Chlorides: 12,000 ppm

• Outlet:

• TSS Removal Target: 30 ppm avg monthly, 100 ppm max daily• Design Basis – Current ELG regulations for low volume waste

• Filter Presses: 16,500 ft3/day solids, 50% dry solids
Amos	‐ FGD	CPS	WWT	System

From 

Dewatering Desaturation

Tanks

Coagulation

Tanks

Clear Wate

Sump

EQ 

Tanks

Primary

Clarifiers

Lime Ferric Chloride

Sludge 

Holding Tank

Filter Presses

Filter 

Cake

Primary 

Sludge 

Pump

Secondary 

Sludge 

Pump

Waste Water 

Collection 

Sump

Secondary 

Clarifier

Waste Water 

Transfer Pump

1st Stage Filter 

Press Feed 

Pump

2nd Stage Filter 

Press Feed 

Pump

Filter Press Water to 

DW Sump /FGD 

Absorbers

Organosulfide, 

GE MR 2405

Primary Polymer, 

GE CE 2681

Organosulfide, 

GE MR 2405 Secondary Polymer, GE 

AE 1703
Amos	– Bottom	Ash	Pond	Complex

WW TankWW Tank

From Clear 

Water Sump

From Gypsum & 

Leachate Ponds

Polymer

Bottom Ash Pond B

Bottom Ash Pond A

Recirculation Pond Clear Water Pon
FGD	CPS	WWT	Systems

Performance
FGD	CPS	WWTP	Performance	
FGD	CPS	WWTP	Performance	
FGD	CPS	WWTP	Performance	
FGD	CPS	WWTP	Performance	
FGD	CPS	WWTP	Performance	
FGD	CPS	WWTP	Total	Selenium
FGD	CPS	WWTP	Dissolved	Selenium
FGD	CPS	WWTP	Performance	
Copyrighted page(s) removed. Copyrighted 

material is not available in Regulations.gov since 

it may not be reproduced without consent of the 

copyright holder. 

Removed pages can be viewed at the USEPA 

Docket Center, Public Reading Room. 

Address: 1301 Constitution Ave, NW 

Room 3334 

Washington, DC 20004 

Telephone: 202-566-1744 

Email: docket-customerservice@epa.gov
Landfill	Leachate	Surge	Pond

Construction of Leachate 

Surge Pond

Operation of Leachate 

Pond
Mountaineer	WWT		System

CPS WW from 

Plant

Effluent St

Tank

Desat 

Tanks (2) Primary Clarifiers (2)

Lime Primary 

Polymer

Organosulfide

Secondary 

Polymer

Filter Presses (2)

Filter 

Cake

Primary Sludge 

Pumps

Secondary 

Sludge 

Pump

Secondary 

Clarifier

Organosulfide

EQ Tank (1)

Ferric Sulfate

Ferric Mix 

Tanks (2) 

Out of 

Service

Equalized 

WW Pump

Sludge Feed 

Tank

Effluent 

Tank

1st Stage 

Feed Tank

Nutrient

Sulfuric 

Acid

1st Stage Feed 

Pumps

1st Stage 

Reactors (6)

Treated Water 

from Effluent 

Storage Tank

From Leachate 

Feed Pumps

2nd Stage 

Feed Tank

Nutrient

2nd Stage Feed 

Pumps

2nd Stage 

Reactors (6)
Bioreactor	Design

• Influent ORP

• Range from +200 to +300 mV

• Temperature

• Max 105 °F, Min: 50 °F

• TSS Max: 200 ppm

• Nutrient Feed System

• Molasses‐Based Nutrient fed

to first and second stages

• Sulfuric Acid System

• pH of CPS stream averages

between 8 and 8.4 s.u.

• pH adjusted to 7 to 7.5 prior

to entering the ABMet ®

system with acid

• 50 x 130 x 30 ft high co

structure

• 30 in. concrete walls

• Material Selection

• Non‐metallic piping, u

fiberglass, PVC, and H

coated butterfly valve
Bioreactor	Operations	and	Startup

Operations

• Inlet Measurements

• Temperature, pH

• Flow• Degassing• Backwash

• Biomass Disposal

• Manpower• Monitoring

• pH, ORP, Level

• Outage Management• Unit/FGD Startups
FGD‐ABMet

® System

Performance
FGD	CPS	WWT	and	Bioreactor	Performanc

ABS 2: pH ~6.8, ORP ~483 mV (Ag/AgCl)

ABS 1: pH 5.6, ORP 142 mV (Ag/AgCl)
Startup	Effects	on	Selenium	Speciation

Startup(2 ABSs)

(ppb)
FGD	CPS	WWT	and	Bioreactor	Performance
FGD	CPS	WWT	and	Bioreactor	Performance
FGD	CPS	WWT	and	Bioreactor	Performance
FGD	CPS	WWT	and	Bioreactor	Performance
FGD	CPS	WWT	and	Bioreactor	Performance
FGD	CPS	WWT	and	Bioreactor	Performance
FGD	CPS	WWT	and	Bioreactor	Performance
Point	of	Contact

Tim Lohner, Ph.D. Consulting Environmental Specialist

American Electric Power,

1 Riverside Plaza, Columbus, OH 43215

614‐716‐1255 twlohner@aep.com