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INDIANA HARBOR AND CANAL CONFINED DISPOSAL FACILITY
Groundwater Treatment (before dredging) Treat groundwater extracted by Gradient Control System to discharge criteria in NPDES permit issued by Indiana Department of Environmental Management (IDEM) From 2007 to 2012 – ~200 million gallons treated
Primary groundwater contaminants •Organic compounds (benzene, naphthalene, PCBs) •Metals •Ammonia •Oil & grease
Primary processes •Frac tank: flow equalization/primary settling •Bag filters: metals removal •Organo clay filters: oil removal •Carbon filters: organic compound removal/polishing •Chlorination: ammonia removal •Sodium bisulfite addition: dechlorination •Discharge to Canal
Plant capacity: 200 gallons per minute
Dredge Water Treatment (after dredging starts) Treat water from the CDF cell to NPDES permit discharge criteria (parameter list expanded from groundwater only) Water from CDF cell is combination of groundwater, dredge water, precipitation
Primary dredge water contaminants
•Organic compounds (PAHs, PCBs) Breakpoint Chlorination •Metals •Ammonia •Oil & grease •Suspended solids
Proposed primary processes (future plant) •Coagulation/Flocculation: metals removal •Clarifiers: metals removal •Chlorination: ammonia removal •Organo clay filters: oil removal •Carbon filters: organic compound removal/polishing •Sodium bisulfite addition: dechlorination •Discharge to Canal
Plant capacity: 200 gallons per minute
Groundwater
from Gradient Control System
Flow MeterFrac Tank #2
In-Line Static Mixers
Chlorine Addition
P-8
E-20
E-17
E-19
E-24 E-16 E-21
E-25
I-2
P-17
P-20
P-14
P-16
P-11 P-15 P-18
E-18
P-19
P-12
P-12
E-23
E-22 P-13
P-12
Sodium Bisulfite Addition
Discharge
to Canal
Bag
FiltersFrac Tank #1 Organo Clay
FilterCarbon
Filter #1Carbon
Filter #2
Carbon
Filter #3Carbon
Filter #4
Groundwater Treatment Plant Process Flow Diagram
Groundwater
from Gradient Control System
Flow MeterFrac Tank #2
In-Line Static Mixers
Chlorine Addition
P-8
E-20
E-17
E-19
E-24 E-16 E-21
E-25
I-2
P-17
P-20
P-14
P-16
P-11 P-15 P-18
E-18
P-19
P-12
P-12
E-23
E-22 P-13
P-12
Sodium Bisulfite Addition
Discharge
to Canal
Bag
FiltersFrac Tank #1 Organo Clay
FilterCarbon
Filter #1Carbon
Filter #2
Carbon
Filter #3Carbon
Filter #4
Groundwater Treatment Plant Process Flow Diagram
Groundwater and Dredge Water Treatment