Understanding urban stormwater denitrification in bioretention internal water storage zones.

摘要: Conventional free-draining bioretention systems promote nitrate production and continual leaching to receiving waters. In this study, laboratory tests demonstrated the efficacy of an internal water storage zone (IWSZ) target removal via denitrification. Experimental results confirmed that carbon substrate characteristics (Willow Oak woodchip media) hydraulic retention time nitrified stormwater affected performance. A 2.6-day batch treatment reduced 3.0 mg-N/L <0.01 mg/L, corresponding a first-order denitrification rate constant 0.0011 min-1 . Under various flow conditions, associated may be used as predictive measurement Scanning electron microscopy 16S rRNA analysis woodchips showed biofilms were present could responsible for anaerobic lignocellulose degradation This knowledge, along with evaluation biofilm community composition, reinforced notion heterogeneous structure due nutrient availability hydrodynamic conditions. PRACTITIONER POINTS: Denitrification can occur using in zone. The is slow limited during field-scale applications. pretreatment did not provide long-term enhancement rate. bacteria found