Accession Number:

ADA361762

Title:

Biodegradation of Aircraft Deicing Fluid Components in Soil.

Descriptive Note:

Master's Thesis

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH

Personal Author(s):

Report Date:

1999-03-01

Pagination or Media Count:

189.0

Abstract:

Aircraft de-icing fluids ADFs are used worldwide to ensure safe aircraft operations. This research effort was conducted to analyze the biodegradation effects of two chemical components of ADFs, propylene glycol PG and tolyltriazole TTA, in a high-clay soil. The research used four test methods automated respirometry, high performance liquid chromatography HPLC, microbial colony population counts MCPC, and agar well diffusion tests AWDT. The research was partitioned into two phases of investigation. Phase-one analyzed individual and combined ADF chemical components on uncontaminated soil. The presence of TTA, from 25 - 1,000 mgkg, reduced the maximum respiration rate of 1,000 mgkg PG alone however, cumulative respiration over the two-week study period was proportionality higher for TTA 25 - 500 mgkg. Rate and respiration totals for soil exposed to TTA 25 - 750 mgkg alone, were not significantly different from background soil however, rate and respiration totals for PG 1,000 mgkg alone were significantly higher. The HPLC percentage of recovered TTA, with or without PG presence, indicated a loss biodegradation andor absorption of TTA within the soil. Kellner 1999 conducted HPLC for absorptiondesorption of TTA on the same high-clay soil. MCPC and AWDT indicated no measurable toxic effects to microbial populationshealth occurred from ADF chemical components. Phase-two research conducted reapplication of ADF chemicals on acclimated soils from phase-one. Initial respiration rates from application of 1,000 mgkg PG on acclimated soil PG 1,000 mgkg compared to 1,000 mgkg PG on uncontaminated soil. The acclimated soil produced a significantly larger initial rate of respiration.

Subject Categories:

  • Biochemistry
  • Fluid Mechanics
  • Solid Wastes and Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE