J. Marin, K.J. Kennedy, C. Eskicioglu, and M.F. Hamoda (Canada)
Anaerobic,baffled reactor, deicing fluid
A four-compartment, anaerobic baffled reactor (ABR) incorporating granular sludge biomass (GSB) was operated at different hydraulic retention times (HRTs) in the range of 3 to 24 hours using dilute aircraft deicing fluid (ADF) with different chemical oxygen demand (COD) concentrations (300, 500 and 750 mg/L) at organic loading rates (OLRs) between 0.3 and 6 kg COD/m3 /d. A total of 15 experimental runs conducted in continuous mode achieved COD removal efficiencies ranging from 61 to 93%. Better COD removal efficiencies were achieved at the highest concentration of ADF and HRTs over 6 hrs. For a shorter HRT of 3 hrs, removal efficiency was still acceptable, but additional treatment would be necessary to satisfy effluent discharge standards. Methane production was close to the theoretical value of 0.39 L CH4/g COD removed at 35°C. Low biomass yield and low endogenous decay coefficient were observed. Application of a first-order kinetic empirical compartment model was developed to describe performance of the GSB-ABR. The model predicted response (COD removal efficiency) was not in good agreement with the observed experimental results.
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