Soil Biodegradation of Propylene Glycol Based Aircraft Deicing Fluids

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Abstract:

The discharge of untreated aircraft deicing fluid (ADF) wastes to surface water and stormwater collection systems is largely prohibited in the U.S., and many airports are searching for alternative methods for managing ADF wastes. A series of soil pan studies were conducted to examine soil biodegradation as a treatment for managing ADF wastes on site. The soil pan studies were designed to evaluate system operating conditions and surface application rates required to enhance biotreatment kinetics and propylene glycol removal. Results indicate that biodegradation of propylene glycol in soil followed first-order kinetics. Soil aeration, lime amendment, and sludge amendment increased the "base level" first-order loss coefficient by as much as a factor of 4. Degradation of propylene glycol to practical quantitation levels (10 to 17 mg/kg soil; dry weight basis) was observed in soils receiving ADF solutions of 5, 10, and 20% by weight at corresponding initial propylene glycol concentrations of 7016, 14 032, and 28 064 mg/kg. Biodegradation was severely inhibited when a 40% by weight ADF solution was applied to the soil. A reduced lag phase and increased rate of propylene glycol degradation occurred when ADF solutions in the range of 5 to 10% by weight were reapplied to soils.

Keywords: AIRCRAFT DEICING; AIRPORT RUNOFF; FIRST-ORDER KINETICS; GLYCOL; LAND TREATMENT

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143097X121997

Publication date: July 1, 1999

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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