Performance evaluation of the Worms subsurface flow constructed wetland for treating black water using insitu and exsitu analytical methods

Abstract This paper evaluates the performance of a subsurface flow constructed wetland at Worms Germany used for treatment black and grey water from non-residential facility. Snap samples four wells made up clarifying unit, an activated carbon unit aeration were analysed insitu using HACH HQ40d multimeter exsitu Sensafe metals check strips preliminary metal detection onsite. bar code reagents, Digital Reactor Block 200 (DRB200) DR 3900 Spectrophotometer subsequently analysis lead (Pb), chromium (Cr), cadmium (Cd), biochemical oxygen demand (BOD), Chemical Oxygen (COD), Ammonium (NH 4 -N) Nitrate (NO 3 in lab. The removal efficiency was order BOD > Cr COD NH -N NO Pb. 57.90% due to higher fractions inert which constitutes part water. makes use BOD/COD ratios 0.69 0.5 1 unreliable index determination amenability with regards microbial activity Worms. pH range 7.2–8.4 blackwater is conducive growth microbes necessary breakdown organic matter Further investigation including plant sediment over different seasons has be undertaken if nutrients optimized.