Activated soil filters (bio filters) for the elimination of xenobiotics (micro-pollutants) from storm- and waste waters |
| |
Authors: | Kai Bester,Daniel Schä fer |
| |
Affiliation: | a Department for Biotechnology, Chemistry and Environmental Engineering, Aalborg University, Sohngardsholmsvej 57, 9000 Aalborg, Denmark b Institute of Environmental Analytical Chemistry, University Duisburg-Essen, Universitätsstrasse 15, 45141 Essen, Germany |
| |
Abstract: | A technical scale (0.12 m3) activated soil filter (bio filter) has been used to eliminate diverse xenobiotics (organic micro-pollutants) such as organophosphate flame retardants, and -plasticisers, musk fragrances, DEHP, benzothiazoles and triclosan from water. Model experiments to treat combined sewer overflow, storm water and a post treatment of waste water were performed in controlled laboratory experiments. The indicator compounds were typical for waste water. Diverse chemical compound groups and a wide spectrum from the lipophilic (pKow = 5.9) to the hydrophilic (pKow = 2.6) were included. The system consisted of a layer with high organic content (with vegetation to prevent clogging), a sand filter and a gravel drainage layer. The organic layer was spiked with activated sludge to enhance biomass and biodegradation potential. Usually the elimination rates varied from 64% to 99%, with only one compound reaching as little as 17%. For a technical suitability assessment it was calculated how long these filters would be stable in eliminating organic compounds from water. The estimated operating times for such systems was found to be about 100 years for a stack height of 2 m a year in regard to most compounds in this study. |
| |
Keywords: | Bio filter Storm water Hydrophilic xenobiotic compounds Triclosan Flame retardants |
本文献已被 ScienceDirect 等数据库收录! |
|