Flue Gas Desulfurization CASE STUDY Wastewater Treatment System

CASE STUDY
Virginia Electric & Power Company, Chesterfield Station
Virginia, United States
FGD
TREATMENT
DENSADEG
SMALL
FOOTPRINTS
Flue Gas Desulfurization
Wastewater Treatment System
HEADWORKS | BIOLOGICAL | SEPARATIONS | MEMBRANES | OXIDATION-DISINFECTION | BIOSOLIDS | INDUSTRIAL SYSTEMS
Richmond, VA
Flue Gas Desulfurization Wastewater Treatment System
Virginia Electric & Power Company
•
Regulated Electric Utility Company
•
Fortune 500 Company with over $15 Billion in revenue
•
Power distribution and generation
FGD
Wastewate
r
300 gpm
(Max)
pH = 6.0
Virginia Electric & Power Company, Goals and Challenges
•
Clean Air Act required SO2 abatement
•
Limited space available
•
Completely indoors (small footprint)
Degremont Technologies Solution
•
Standard Degremont Technologies – Infilco FGD WWTP
•
System Design Conditions
a. Flow – 300 gpm
b. TSS – 20,000 mg/l
c. TDS – 20,000 – 60,000 mg/l
d. Chlorides – 30,000 mg/l
•
The WWTP is designed to meet and/or exceed:
a. Twenty (20) heavy metal effluent requirements
b. Six (6) general process requirements
c. 99% operational reliability
•
The WWTP is designed for a future biological treatment system
that will be able to meet effluent requirements for:
a. Nutrient control
b. Selenium control
Equalization
Tank
Equalization
Tank
Lime
Desaturation
Tank
Desaturation
pH
8
–
9.5
Tank pH 8 – 9.5
Organo-Sulfide
Coagulant
MetalsMetals
Precipitation
Precipitation
Tank
Tank
Flocculant
Sludge
Waste
Virginia Electric & Power Company Benefits
•
Operator friendly design
•
Able to handle upset condition with no loss of performance
Parameter
TSS
Removal
Efficiency
Parameter
Cr
70 %
Ag
90 %
Fe
99.7%
Al
99.5 %
Hg
90 %
As
96.7 %
Ni
75 %
Cd
95 %
Pb
90 %
Cu
95 %
Zn
98 %
Clarifier/Thickner
(DensaDeg)
Dilution
Water
HCI
pH
pHadjust
adjust
6.5
6.5 - 88
Removal
Efficiency
99.9 %
Sludge
Recycle
Dewatering
System
INFILCO DEGREMONT, INC.
8007 DISCOVERY DRIVE, RICHMOND, VA 23229
804 756-7600 (TEL) ● 804 756-7643 (FAX)
WWW.DEGREMONT-TECHNOLOGIES.COM
To Ash
Pond