Preprint Article Version 1 This version is not peer-reviewed

Effect of Grain Size and Nutrient Feeding on the Treatment Potential of Biofilters for Treatment of   De-Icing Chemicals

Version 1 : Received: 20 March 2018 / Approved: 20 March 2018 / Online: 20 March 2018 (16:28:04 CET)

A peer-reviewed article of this Preprint also exists.

Raspati, G.S.; Lindseth, H.K.H.; Muthanna, T.M.; Azrague, K. Potential of Biofilters for Treatment of De-Icing Chemicals. Water 2018, 10, 620. Raspati, G.S.; Lindseth, H.K.H.; Muthanna, T.M.; Azrague, K. Potential of Biofilters for Treatment of De-Icing Chemicals. Water 2018, 10, 620.

Journal reference: Water 2018, 10, 620
DOI: 10.3390/w10050620

Abstract

Biofilter application for treatment of stormwater containing de-icing chemicals commonly applied in airports, propylene glycol and potassium formate, was investigated. Lab-scale adsorption tests using filter media made of crushed clay (Filtralite) and granular activated carbon showed that adsorption was unsuitable for removal of propylene glycol and potassium formate. Column filtration experiment testing two different crushed clay size ranges was conducted. The results showed that DOC removal was dependent on a number of factors. This study investigated the impact of filter depth, nutrients addition, and filtration rate. DOC removal suggested that DOC degradation occurred on the top filter layer. It was shown that the most active separation occurred in the first ~20 cm of filter depth. This was confirmed by results from water quality analysis (i.e. DOC removal and ATP measurement) and calculations based on a filtration performance analysis (Iwasaki model) and filter hydraulic evaluation (Lindquist diagram). It was shown that for the highest C:N:P ratio tested (molar ratio of 24:7:1), 50-60% DOC removal was achieved. Addition of nutrients was found important and determining the biofilter performance.

Subject Areas

stormwater; biofilter; de-icing chemicals; nutrients; filtration performance

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