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The Secretary's Office of Environment 

Winter Operations across Maryland Department of Transportation

In anticipation of the change in seasons, MDOT incorporates environmentally sensitive and cost effective practices when it comes to winter operations for highway maintenance, snow removal, and aircraft deicing activities. 

Snow Removal and Best Practices for Salt Use













The MDOT State Highway Administration (MDOT SHA) worked with Maryland Department of the Environment (MDE) to develop a Statewide Salt Management Plan which implements best practices for sustainable salt use in case of snow events.  Some best practices used by MDOT SHA include increased proactive anti-icing (spraying salt brine on highways before the onset of frozen precipitation), close monitoring of salt application rates used by MDOT SHA and contract operators, and increased personnel training in "sensible salting" operations.  Further information regarding MDOT SHA's best practices can be found on their Winter Operations webpage and associated links on the page.


BWI's Aircraft Deicing Fluid Program 


According to the Federal Aviation Administration, airlines and airports that operate during snow and ice conditions must perform deicing and anti-icing of aircraft. In full compliance with Federal Aviation Administration and MDOT Maryland Aviation Administration (MAA) regulations, the MDOT MAA Office of Environmental Services (OES) has initiated an innovative aircraft deicing fluid recycling program that provides both economic benefit and a green practice.  In the past, MDOT MAA managed general deicing at Baltimore Washington Thurgood Marshall International Airport by implementing technologies to allow for the diversion, storage and disposal of aircraft fluid contaminated stormwater.   MDOT MAA's new recycling program takes environmental stewardship a step further by capturing spent aircraft deicing fluids (ADF), recycling the wastes and saving resources and energy rather than solely implementing the conventional disposal and treatment method. 

Since 1994, Baltimore Washington Thurgood Marshall International Airport (BWI Marshall) has implemented an airport-wide spent aircraft de-icing fluid management program.  This program created infrastructure that temporarily diverted select areas of stormwater runoff containing spent ADF to designated collection tanks.  However the captured ADF, a diluted glycol and stormwater mix containing various contaminants, was not recycled.  The mix was pumped into large scale collection tanks, sampled, buffered, and ultimately released into the sanitary sewer system for treatment at the Baltimore Department of Public Works wastewater treatment plant. MDOT MAA's Office of Environmental Services (OES) has initiated a unique program that captures, transports and recycles spent ADF collected at BWI-Marshall, reducing the negative effect of spent ADF on the environment. The aircraft fluid recycling program segregates captured high concentrates of ADF for transport and recycling off site.  Recycling a portion of collected aircraft deicing fluid minimizes waste and pollution generated by BWI, reduces the amount of spent ADF sent to the public wastewater facility for processing, and creates a viable new product for market sales.  


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