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The Effect Of Various Intermittent Dry-Wet Cycles On Nitrogen Removal Capacityin Biofilters Systems

The Effect Of Various Intermittent Dry-Wet Cycles On Nitrogen Removal Capacityin Biofilters Systems

Stormwater biofilter systems have the potential to remove nutrients from urban runoff. These systems operate in unique intermittent dry-wet cycles that may affect their performance. Current consensus suggests that sediment drying promotes the release of potentially significant amounts of bio-available nitrogen and phosphorus upon rewetting. We sought to investigate the impact of drying/wetting cycles on biofilter performance. Eighteen columns were planted with Carex appressa which reached maturity after eight months. The recovery of biofilter systems was tested in a range of drying periods from one to eight weeks with and without a Submerged Anoxic Zone (SAZ) and carbon supplement in the filter media.

 

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