Biofilter treatment of stormwater: temperature influence on the removal of nutrients Traitement des eaux de ruissellement par biofiltration: influence de la température sur l’absorption des nutriments Godecke-Tobias Blecken*, Maria Viklander*, Tone Muthanna**,
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چکیده
Nutrients can cause eutrophication of natural water bodies. Thus, urban stormwater which is an important nutrient source has to be treated in order to reduce its nutrient loads. Biofilters which use media, biofilms and plants, are a good treatment option regarding nutrients. This paper presents the results of a biofilter column study in cold temperatures (+2°C, +8°C, control at +20°C) which may cause special problems regarding the biofilter performance. It was shown that particle bound pollutants as TSS and a high fraction of phosphorus were reduced well without being negatively influenced by cold temperatures. Nitrogen, however, was not reduced; especially NOx was produced in the columns which can be explained with both insufficient denitrification and high leaching from the columns.
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تاریخ انتشار 2007