|
This research was carried out to investigate the efficiencies of leachate treatment by usingsubsurface flow constructed wetland (CW) with low permeable reactive media and guinea grass(Panicum maximum TD 58). Pilot scale CW was examined at hydraulic loading rate (HLR) of0.028 m/d and hydraulic retention time (HRT) of 10 d. Two different types of media in CW wereused i.e. system 1: clay and sand mixture at ratio of 40:60 (%w/W) and system 2: clay, iron sludgeand sand mixture at ratio of 30: 10:60 (%w/w). The results showed that the performance of system 2was better in terms of pollutant removal efficiencies. Average BOD, COD and TKN removals were76.1, 68.5 and 73.5% respectively. Methane, carbon dioxide and nitrous oxide emissions during thetreatment of CW were 23.2-52.1, 69.1-601.8 and 0.04-0.99 mymzd respectively. The use of CWwith reactive media in system 2 and vegetation resulted in lower GHG emissions. The results showthat CW with low permeable reactive media could be effectively used to remediate leachate fromthe landfill site. |
