Roberta Aguirre
Airport glycol systems refer to the processes and infrastructure in place to manage the use and disposal of glycol, a key component of de-icing fluids used on aircraft and runways during winter. The systems aim to capture, treat, and recycle glycol-laden stormwater, preventing environmental contamination and reducing costs for airports. The treatment of glycol effluent is challenging due to its impact on ecosystems and the unpredictable nature of de-icing events. Airports employ various methods, such as vacuum trucks, de-icing pads, and wastewater treatment plants, to manage glycol, with an increasing focus on recycling and pretreatment to reduce environmental impacts and cut carbon emissions. The design and implementation of these systems are crucial for airport operations, ensuring safety, timely departures, and compliance with environmental regulations.
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What You'll Learn
Glycol as a de-icing agent
When temperatures drop, aircraft need to be de-iced before takeoff. De-icing fluids are typically composed of ethylene glycol (EG) or propylene glycol (PG), along with other ingredients such as thickening agents, surfactants (or wetting agents), corrosion inhibitors, colours, and UV-sensitive dyes. The main component of de-icing fluid is a freezing point depressant (FPD), which prevents the refreezing of ice on aircraft wings.
Propylene glycol-based fluids are more common because they are generally considered safe for human consumption and are less toxic than ethylene glycol. However, both types of glycol are harmful to wildlife and the environment. For this reason, federal and state environmental agencies regulate the handling of glycol-laden stormwater.
To comply with regulations, airports have focused on capturing and pretreating glycol effluent. However, recycling glycol effluent is an alternative solution that can offset wastewater discharge fees, mitigate environmental effects, and reduce carbon dioxide emissions. Recycling also reduces the cost of glycol by reducing the amount used.
Glycol recycling systems can be designed and built to treat and recycle glycol for reuse as a de-icing agent. Low-concentration glycol can be extracted from stormwater, allowing for the reuse of de-icing fluid. Removing a light frost layer can be handled at the gate by glycol recovery vehicles, while heavier de-icing tasks require a dedicated space.
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Environmental impact of glycol systems
During winter, when temperatures drop below freezing points, glycol is used as a de-icing fluid to remove frost, snow, and ice from aircrafts and runways. This is important for safety reasons as ice increases weight and adversely affects aerodynamics. While propylene glycol, the main chemical in de-icing fluid, is generally safe for human consumption, it is harmful to wildlife.
Once the aircraft is de-iced and en route, the airport is left with a mixture of stormwater and low-concentration glycol, which is harmful to downstream ecosystems. This has led to federal and state regulations on how this mixture is handled. The challenge for airports is the ability to capture and control spent glycol before it reaches the groundwater and causes environmental damage.
To address this issue, some airports have constructed de-icing pads and dedicated pond systems to limit glycol effluent from mixing with stormwater. While this method works, it comes at a great cost and can impact flight operations. Another solution is to recycle the glycol on-site, which can reduce carbon dioxide emissions by up to 99.9% and lower costs. Recycling also helps to improve the supply chain and minimize environmental impact.
Some companies offer glycol recycling systems and vehicles that can collect and treat the glycol for reuse. This not only protects the environment but also reduces costs by decreasing the amount of glycol purchased. With most airlines and airports striving for carbon neutrality, the benefits of glycol recycling are becoming more attractive.
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Recycling and reusing glycol
To recycle glycol, airports can implement systems to treat and recycle it, reducing negative environmental consequences. For instance, Syracuse Hancock International Airport (SYR) has a glycol recycling facility that uses a "full cycle" approach. This involves recovering the fluid after de-icing, recycling it on-site, and then reusing it for de-icing. The facility can treat aircraft de-icing fluid with a glycol concentration as low as 0.25%. This technology helps to reduce the airport's water consumption and carbon footprint.
Another example of a company that offers glycol recycling systems is Burns & McDonnell, which designs and builds de-icing and glycol recycling systems of various scales. They have experience in implementing systems that treat and recycle glycol, and they emphasise the environmental benefits of such systems.
Properly disposing of and recycling used glycol is essential, as improper handling and disposal of glycol (often used as antifreeze) can pose serious health and environmental risks. It is important to keep new and waste glycol in clean, closed, and labelled containers that are in good condition. There are specific guidelines for the safe disposal and storage of glycol, and it should not be stored in old food or beverage containers or within the reach of children and pets.
There are companies that offer waste removal and recycling services for glycol, and empty containers can often be recycled through local recycling programs as they are typically made of widely accepted types of plastic.
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Wastewater treatment plants
During winter, aircraft de-icing operations are crucial for safety. De-icing fluids, which contain glycol, are sprayed on aircraft to remove frost, snow and ice from the wings and protect against refreezing before takeoff. However, once the de-icing fluid hits the ground, it becomes a challenge for airports and wastewater treatment plants.
De-icing fluids contaminate airport stormwater, and if not properly managed, can cause environmental damage to downstream ecosystems. The contaminated water is often sent to wastewater treatment plants for biological degradation, where bacteria are used to treat the glycol. However, this process can produce a substantial amount of carbon dioxide. In addition, the large volume of contaminated water produced by airports can overload the capacity of wastewater treatment plants, causing disturbances in sewage treatment.
To address these issues, some airports have implemented on-site wastewater treatment plants, such as anaerobic digesters and filtration units, to manage the concentration of glycol before it is discharged into nearby water bodies. Additionally, advances in technology have made it possible to recycle glycol effluent, reducing environmental impacts and cutting back on carbon dioxide emissions. Recycling glycol can also lead to significant cost savings for airports and airlines.
Another approach is to implement systems for the collection, transportation, and treatment of contaminated runoff water. This includes the use of glycol recovery vehicles, which can collect the de-icing agent for reuse. Furthermore, the construction of de-icing pads and dedicated pond systems can help limit glycol effluent from mixing with airport stormwater.
Overall, the management of glycol-laden stormwater and the treatment of de-icing fluids are critical aspects of airport operations, requiring collaboration between airports, environmental staff, and wastewater treatment service providers to ensure both safety and environmental protection.
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Management of glycol systems
Capturing and Controlling Spent Glycol
The application of glycol-based de-icing fluids is essential for aircraft safety during winter operations. However, once these fluids are applied, capturing and controlling their dispersion is crucial. This includes the use of designated de-icing pads or specific areas near gates to contain the fluid. Glycol recovery vehicles play a vital role in this process, collecting the spent glycol for recycling or treatment.
Recycling and Treatment of Glycol
Recycling spent glycol is becoming an increasingly attractive option for airports. By investing in on-site glycol recycling facilities, airports can significantly reduce costs, especially with the rising prices of glycol due to supply chain issues. Recycling also offers environmental benefits by reducing the amount of glycol produced and lowering carbon dioxide emissions associated with off-site wastewater treatment.
Regulatory Compliance
Federal and state environmental agencies have specific regulations for the capture and treatment of glycol-laden stormwater. Airports must adhere to these guidelines to ensure the proper handling and disposal of glycol effluent, which can be harmful to downstream ecosystems. This includes considerations for pretreatment and storage facilities, which can be challenging due to space constraints at airports.
System Design and Planning
Effective planning and design of glycol systems are essential to optimize de-icing operations. This includes evaluating fluid supplies, loading processes, and turn-times for trucks. Consulting specialized companies for system design and construction can help airports establish efficient and effective glycol management processes, including centralized de-icing facilities and distribution systems.
Alternative De-icing Methods
While glycol is a prevalent de-icing solution, airports have also explored alternative methods, such as drive-through induction heaters and fixed boom operations. However, these alternatives often require additional infrastructure and may not be as effective or practical as glycol-based solutions.
In summary, managing glycol systems at airports involves a combination of strategic planning, regulatory compliance, and the adoption of recycling practices to ensure the safe and efficient use of de-icing fluids while minimizing environmental impacts and operational costs.
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Frequently asked questions
An airport glycol system is a setup that treats and recycles glycol, a de-icing agent used on aircraft and runways during winter.
Glycol is used to remove frost, snow, and ice from aircraft and runways during winter. This process is crucial for safety as ice increases weight and adversely affects aerodynamics.
Once an aircraft is de-iced, the airport is left with a mixture of stormwater and low-concentration glycol, which is harmful to downstream ecosystems. Federal and state environmental agencies regulate the handling and treatment of this mixture.
Airports can implement systems like deicing pads, vacuum trucks, and glycol recovery vehicles to collect used glycol. Collected glycol can then be treated and recycled through various methods, including biological treatment, distillation, and reverse osmosis.
Recycling glycol offers both environmental and economic benefits. It helps reduce environmental impacts by mitigating downstream ecological effects and lowering carbon dioxide emissions. Additionally, recycling can reduce costs by decreasing the amount of glycol an airport needs to purchase.
