Kinetics of anaerobic degradation of glycol-based type I aircraft deicing fluids.
The kinetics of anaerobic degradation of glycol-based Type I aircraft deicing fluids (ADFs) were characterized using suspended-growth fill-and-draw reactors. Both Type I ADFs tested showed near-complete anaerobic degradability. First-order degradation rate constants of 3.5 d(-1) for the propylene glycol-based Type I ADF and 5.2 d(-1) for the ethylene glycol-based Type I ADF were obtained through continuous-culture means under mesophilic conditions (35 degrees C). Fill-and-draw operation at lower temperatures affected anaerobic degradability only minimally down to 25 degrees C but substantially below 25 degrees C. High Type I ADF feed concentrations substantially affected degradability. Batch testing of fill-and-draw reactors resulted in first-order degradation rate constants of 1.9 d(-1) for propylene glycol-based Type I ADF and 3.5 d(-1) for ethylene glycol-based Type I ADF.
Schoenberg
T
T
Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, USA. tschoenb@ecs.umass.edu
Veltman
S
S
Switzenbaum
M
M
D000401:Aircraft; D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D019149:Bioreactors; D004785:Environmental Pollutants / Q000378:metabolism; D019855:Ethylene Glycol / Q000378:metabolism*; D007053:Ice; D007220:Industrial Waste; D007700:Kinetics; D019946:Propylene Glycol / Q000378:metabolism*; D013696:Temperature
D004785:Environmental Pollutants; D007053:Ice; D007220:Industrial Waste; D019946:Propylene Glycol; D019855:Ethylene Glycol