WCS made first contact with representatives of the Calgary Airport Authority (YYC) in January of 2011. The airport is currently looking for a solution for the glycol deicing runoff that makes its way into their storm water storage ponds. If the concentrations get too high, YYC can experience odor problems, and if they have to send their water to the city for treatment, they can incur substantial surcharges. Having never tested the Bio-Domes in such an application, WCS was eager to work with YYC to run a pilot test on the ability of the Bio-Domes to breakdown the ethylene glycol.
Solution & Results
After lots of planning, a Mobile Pilot unit was delivered to YYC on October 17, 2012. Elevated glycol levels were detected in May of 2013, at which point the influent to the pilot unit had a glycol and BOD concentration of 112 mg/L and 107 mg/L respectively. The effluent concentrations were below the detection limits of 10 mg/L and 2 mg/L respectively. WCS then worked with YYC to run a series of batch reactions where the pilot unit was spiked with ever increasing concentrations of Glycol. The last test, begun May 30, showed a complete biological breakdown of the ethylene glycol from 3400 mg/L to 16 mg/L in 14 days. During this same period the BOD levels rose and the glycol was broken down but showed signs of beginning to diminish during the last sample taken before the pilot unit had to be shut down. Subsequent batch runs were performed at the WCS facility in Lehi, UT. Results are shown below.