BNIA Engineered Wetlands Our Airports Stromwater Treatment System May 23, 2012 ACI Deicing Conference Mark Clark Sr. Aviation Planner
Buffalo Niagara International Airport 130 daily flights, 27 gates 96 Avg. snow fall 330,000 350,000 gallons glycol (100%) 1.2 MGD stormwater runoff
At gate Deicing System Airline decision 1995-96 built a parallel storm system with a dedicated storm and spent glycol lines Use of both GRV s and POTW Have a dedicated snow melt pad for pink snow
What needs to be treated? Will require +/- 15 million gallons for 10 year storm Would require about 25 million gallons for 100 year storm Air Cargo
How we progressed since 1990 like chasing a ghost Meeting SPDES 30Mg/L BOD 1990 No Spent Glycol pick up at all permit kicked in Airlines chose to have at gate deicing and not a decentralized dedicated site 1996 Set up parallel system when built new terminal apron 200,000 gal UST to BSA In early 2000 we added in another 800,000 gallons of underground storage Sent everything to POTW Cost to treat at POTW = $1,200 - $4,500 Use GRV s and refractormeters n hopes of recycling with contract for incentives Issues as we chased this ghost Issues with jet blast glycol onto grassy areas Snow removal in slushy conditions Airlines not staying within designated deicing areas GSE Equipment running tracking through spent glycol TOC conveyance system began restrictions and complained of pump house odors Created flooding of our 3 mil basin, went septic and more issues BSA decided they needed big bucks to treat went from $4,500 to over $225,000. Always looking to improve and to identify alternatives
Alternatives Dedicated sewer line to POTW Anaerobic/aerobic onsite treatment Membrane bioreactors Recycling Infratek systems Reed bed subsurface wetland Decentralized deicing w/ recycling Get NYSDEC Relief from 30Mg/L BOD5
Subsurface engineered wetland Advantages Disadvantages Concerns Low operating costs Effective treatment for stormwater Totally Green Process Aesthetics No odor Space constraints Wild Life Unknown costs Odor Will it work Engineered Wetland in India Traditional Wastewater Treatment
We took a leap of faith & decided to Go for it 2006 -Treatability study showing >95% reduction in BOD 2007- Design phase completed 2008- Construction started 2009- Construction Completed and operational for 2009/2010 Deicing Season
Process Sizing and Layout Cells are designed for a total load of 10,000 pounds of oxygen demand per day 4 Cells - Each cell approximately 175 x300 With cells, retention tanks, & piping, approximate glycol storage is over 12 million gallons
12/13/02 2/13/03 4/13/03 6/13/03 8/13/03 10/13/03 12/13/03 2/13/04 4/13/04 6/13/04 8/13/04 10/13/04 12/13/04 2/13/05 4/13/05 6/13/05 8/13/05 10/13/05 12/13/05 2/13/06 4/13/06 6/13/06 8/13/06 10/13/06 12/13/06 Concentrate in storage (gal) Daily BOD 5 loading from collection system (lb/day) Evaluating Peak Events large peak events BNIA required peak shaving volume assuming max. treatment of 10,000 BOD 5 lb/day December 2002 - January 2007 Concentrate in storage Daily concentrate BOD5 loading from collection system 10,000,000 9,000,000 8,000,000 60,000 50,000 7,000,000 6,000,000 5,000,000 4,000,000 3,000,000 2,000,000 1,000,000 0 40,000 30,000 20,000 10,000 0 Date
How we Built it
Construction
The Finished Product BNIA s Engineered Wetlands
How does it work?
This is how Nitrogen & Phosphorus 5/31/2012
Glycol Treatment Glycols are readily degradable or eaten by bacteria
Propylene Glycol Cake mix, chewing gum, salad dressing, soft drinks, popcorn Lotions & creams Cosmetics, shampoo Cleaners Found in: Baby wipes
How do we manage the system? Like an Aquarium Temperature, Food, Shelter, PH and Oxygen Temperature 50 to 55 degrees underground Food Glycol, oils and grease Shelter Mulch & Topsoil PH Keep it balanced Oxygen Pumped in
Just the Facts System is a Stormwater system which treats spent glycol Will treat EG, PG, oils and grease System initially (only once) injected with designed bacteria Treatment is with Nitrogen & Phosphorus (Fertilizer) On-line full time TOC and Nitrogen Monitoring Treatment duration usually 1-2 days, 3 days max Cost to build = $10,000,000 Cost to operate = 1 st year $100,000 now less than $50,000 year No additional staff required
The Results? We have not exceeded our permit level of 30 mg/l in the past 18 months
4000 2009/10 Wetland Treatment Performance Total Organic Carbon (mg/l) 3500 3000 2500 2000 1500 1000 500 0 Influent Effluent
Some stats 2009-2010 72.7% reduction in lbs of effluent discharged 2010-2011 89.9% reduction in lbs of effluent discharged
What comes in What goes out Before After
Questions?