Building facades can be equipped wi

Building facades can be equipped with biocides to prevent formation of algal, fungal and bacterial films.
Thus run-off waters may contain these highly active compounds. In this study, the removal of several
groups of biocides from contaminated waters by means of an activated soil filter was studied.
A technical scale activated vertical soil filter (biofilter) with different layers (peat, sand and gravel), was
planted with reed (Phragmites australis) and used to study the removal rates and fate of hydrophilic to
moderate hydrophobic (log Kow 1.8–4.4) biocides and biocide metabolites such as: Terbutryn, Cybutryn
(Irgarol 1051), Descyclopropyl–Cybutryn (Cybutryn and Terbutryn metabolite), Isoproturon, Diuron,
and its metabolite Diuron-desmonomethyl, Benzo-isothiazolinone, n-Octyl-isothiazolinone, Dichloro-noctylisothiazolinone
and Iodocarbamate (Iodocarb). Three experiments were performed: the first one
(36 d) under low flow conditions (61 L m2 d1) reached removal rates between 82% and 100%. The second
one was performed to study high flow conditions: During this experiment, water was added as a
pulse to the filter system with a hydraulic load of 255 L m2 within 5 min (retention time

ผลลัพธ์ (ไทย) 3:

The sand and gravel layers also contributed significantly for
some compounds. All compounds are rather removed by degradation. Than by sorption.