Biofilters (water) are developed to collect and purify storm- and wastewater and represent a promising system for storm water treatment. Bacteria and microorganisms are located on a filter medium (biofilm), which often consists of sand or granular activated carbon. The biofilm degrades nutrients and contaminations in the wastewater (influent) that is piped through the filter material. As mentioned above, the term “filter” is misleading. Biofilters separates/removes nutrients and organic carbons from wastewater/storm water through biodegradation. As a result biofiltration improves the quality of wastewater (reduction of nutrients, metals, sediments) and storm water and at the same time harvests storm water and stores it for a certain period.
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