Deicing Fluid and Stormwater Management At Cincinnati/Northern Kentucky International Airport Kenton County Airport Board 2009 ACI-N/A/ATA/RAA Deicing Management Conference July 8, 2009 Don Chapman CVG Jason Sundrup, CVG Kevin Flynn, Delta Airlines
January 27 th & 28 th, 2009
Elijah Creek 3 parallel N/S Runways 1 E/W Runway 7000 Total Acres 2000 Acres Paved Gunpowder Creek
KPDES Permit Monitoring Requirements Flow BOD TSS Oil/Grease Ammonia Dissolved Oxygen Potassium Ethylene/Propylene Glycol Total Organic Carbon
KCAB Permit Limits G-004 Summer/Winter E-003 Summer/Winter BOD (mg/l) 50/85 BOD (mg/l) 70/150 TSS (ppm) 60/60 TSS (ppm) 60/60 Oil/Grease (mg/l) 15/15 Oil/Grease (mg/l) 15/15 Ammonia (mg/l) 4/10 Ammonia (mg/l) 10/10 D.O. (mg/l) 4.0 D.O. (mg/l) 4.0
The Problem Potential Environmental Impacts Fish Toxicity Odor Complaints Nuisance Algae Growth High Biochemical Oxygen Demand Low Dissolved Oxygen KPDES Permit Violations
The Airport-Wide Deicing Fluid Management Philosophy Source Separation Deicing Pads Spent Deicing Fluid Storage Glycol Concentration & Recycling Source Reduction-Pollution Prevention Education & Training Best Management Practices Storm water Collection & Treatment Storm water Detention/Aeration
KCAB Deicing Fluid Collection 21 Deice Pads Approximately 68 Acres
KCAB Deicing Fluid Storage 8 Million Gallon Total 6 Million Gallon South 2 Million Gallon North
Glycol Processing and Recycling Facility
Evaporator
KCAB Best Management Practices Perimeter Marking and Nose Wheel Blocks Surveillance Cameras and Wig Wag Lights
Operation and Maintenance of Deicing Fluid Collection System Controlled By Airport FMS Maintenance and Repair of Diversion Valves and Pump Stations
Collection of Underdrains
Glycol Usage Best Management Practices Fluid Blending and Forced Air
Glycol Usage Best Management Practices Fluid Blending Beginning in 2004/05, our de-ice operation implemented glycol fluid blending process. Utilizing our Type I Glycol Fluid proportioning system, we can dictate the amount of Type I glycol used to mix De-icing fluid, based on the day s weather and temperature forecast.
Glycol Usage Best Management Practices Fluid Blending Example: Current WX is 27 F OAT and Light Snow. Based on the OAT the freeze point of Type I de-icing fluid must be 32 F or lower. Old Method Applying 50/50 Mix (freeze point -18 F) Type I on B-757, using an est. 300 gallons of fluid to de-ice (clean) AC, we use 150 gal. of glycol Current Method Applying 10/90 Mix (freeze point 24 F) Type I on B-757, using an est. 300 gallons of fluid to de-ice (clean) AC, we used only 30 gallons of glycol.
Glycol Usage Best Management Practices Forced Air Forced Air utilizes an air stream to remove accumulation of frozen contamination from the aircraft with or without fluid.
Deice Fluid Usage History Deice Season 1999-2000 2000-2001 2001-2002 Type I (gal) 391,302 650,815 285,084 Type IV (gal) 42,354 84,271 32,832 Total Glycol Usage (gal) 433,656 735,086 317,916 2002-2003 208,936 48,929 257,865 2003-2004 402,441 64,920 467,362 2004-2005 551,823 102,598 654,421 2005-2006 130,191 27,338 157,529 2006-2007 210,334 41,214 251,548 2007-2008 330,079 69,481 399,560 2008-2009 237,693 52,238 289,931
Elijah and Gunpowder Creek Storm Water Conveyance
100 Simulated Daily Average Flow Assessment Combined (GT-1, GT-2-C, & DHL-C) - 1998-1999 Deicing Season Calculated Flow 10 Flow (MGD) Q = 1.5 MGD 1 Baseflow = 0.50 MGD 0.1 10/1/1998 11/20/1998 1/9/1999 2/28/1999 4/19/1999 Date / Time Notes : - Rainfall data used: 10/1/98-4/30/99 CVG Daily Summary data obtained from the National Climatic Data Center Assumptions: - Estimated base flow rate (due to infiltration) added to each calculated flow rate to obtain simulated flow - Precipitation is uniform over entire drainage basin - Predicted flow based on Rational Method (Q=CiA, w here Q = flow, C = curve number, i = precipitation intensity, A = area) - Time of concentration (t c ) is 0 - = Treated Flow - All precipitation occured as rainfall
Elijah and Gunpowder Creek SWTP Collection Areas
Storm Water Conveyance Design Basis Criteria Surface Area 2,910 Acres 3 X Base Flow Collection and Treatment 7.0 MGD @1200 mg/l BOD 36,000 lbs./day BOD
Major System Components 10 Pump Stations 7,000 Linear Feet of Gravity Sewers 36,000 Linear Feet of Force Mains 14 Million Gallon Equalization 7 MGD Capacity Sludge Management 4.5 MG Storage
Concentration Spectrum Concentration Spectrum Concentrated Deicing Fluids (vacuum trucks, collection trenches) Diluted Deicing Fluids (collection trenches) Contaminated Runoff (storm sewer, surface runoff) >20% range 0.1% - 20% range <0.1% - ppm range Recycling Collection and Recycling Stormwater treatment
Runway and Pavement Deicers Potassium Acetate Sodium Formate Sodium Acetate
Stormwater collection Structure
TYPICAL PUMP STATION
Storm Water Treatment Plant
Winter Weather Winter weather is inconsistent. Fluctuating snow fall Rapid thaw and freeze cycle
Two Phases of Construction Phase one: SBR (Sequencing Batch Reactor) Gunpowder Creek only 1.5 Million gallon capability Constructed in 2003 Modified in 2005 Modified to a 3 million gallon capability
Two Phases of Construction Phase two: EAAS (Extended Aeration Activated Sludge) treatment plant Gunpowder and Elijah Creek 7 million gallon pumping capacity Constructed in 2006
Plant Operating Parameters Maximum daily influent flow of 7.0 MGD Maximum daily BOD load of 36,000 lb. Biomass concentrations of 1800 to 3000 mg/l F:M ratio of 0.03 Do not feed every day Air Flow Basin 1: 1600 SCFM Basin 2 & 3: 2900 SCFM Designed effluent quality 50 mg/l BOD 30 mg/l TSS
Storm Water Treatment Plant Flow Diagram Polymer Addition (Aid Settling) Chemical Addition EAAS Basin #1 (3.0 MG) C larifier #3 Influent Flow Box Splitter Box EAAS Basin #2 (5.5 M G) C larifier #2 C larifier #1 EAAS Basin #3 (5.5 M G) Sludge RAS/W AS W aste Activated Sludge Return Activated Sludge Decant Supernatant Centrate R oll O ff Box (20 cu.yd.) Dewatered Sludge Centrifuge Thickened Sludge Sludge Holding Tank (1.5 MG) Digester #2 (1.5 M G) Digester #1 (1.5 M G) R oll O ff Box (20 cu.yd.) Polymer Addition (Coagulant) Digested Sludge Aeration to Sludge Management System Blower #1 Blower #2 Blower
Aeration Basins 14 million gallons of storage 23 aeration headers 621 diffuser banks Aerate and mix
Turblex Blower System Four Turblex blowers supply air to the entire treatment facility Two 450 hp blowers Two 300 hp blowers
Supplementary Chemical Feeding Nitrogen, Phosphorous, and Glycol Urea ammonium nitrate Phosphoric acid Glycol Ratio
Activated Biomass Spent aircraft deicing fluid and runway deicer is broken down with by an aerobic activated biomass, airport bugs. Majority of biomass consisting of Stalk ciliates, free swimming ciliates, and rotifers. Some filamentous, and nematodes.
Clarifiers From the aeration basins the mixed liquors flows into the three clarifiers. Sized proportionally to corresponding basins Scum trough RAS/WAS pumps
Dewatering Influent solids content of 0.8% to 1.2% Polymer addition added as needed Dewatered sludge leaves centrifuge at 15% to 18% Dewatered sludge is hauled away or used on site for beneficial reuse
Plant Effluent Parshall flume Composite sampling Dissolved oxygen and ph monitoring Effluent BOD permit limit of 85mg/L during winter months.
COD Removal Efficiencies Removal Efficiency for 1/1/2009 thru 3/31/2009 Influent COD (mg/l) Influent COD (lbs) Effluent COD (mg/l) Effluent COD (lbs) Total 146,078.00 1,577,979.62 7,510.00 107,140.95 Average 1,679.06 18,348.60 86.32 1,260.48 Removal Efficiency COD (mg/l) COD (lbs) 94.86 93.13
Operational Cost O&M: $165,000 Electric: $304,000 Staffing: $200,000 Total: $669,000
Aeration at the North and South Retention Ponds 5 Aerators on Gunpowder Creek 3 Aerators on Elijah Creek
300 250 200 150 100 50 0 Gunpowder Creek BOD Data November November November November December December December December December January January January January Febuary Febuary Febuary Febuary March March March March April April April April May May May Date 1999-2000 2007-2008 Permit limit BOD (mg/l)
350 300 250 200 150 100 50 0 Elijah's Creek BOD Data November November November November December December December December December January January January January Febuary Febuary Febuary Febuary March March March March April April April April May May May Date 1999-2000 2007-2008 Permit Limit BOD (mg/l)
Creek Improvements Return of wildlife Diversification of fish species Removal of odor from water Creek freezes over during cold spells of winter
Questions