Abstract
Experiments were conducted to investigate the feasibility of applying constructed wetlands to treat a sanitary landfill leachate containing high nitrogen (TN) and bacterial contents. Two-pilot scale subsurface-flow constructed wetland (SFCW) units located at the Asian Institute of Technology, Thailand, campus, were fed with a synthetic wastewater and landfill leachate collected from a nearby sanitary landfill. Under the tropical conditions (temperature of about 30°C), the SFCW units operating at the hydraulic retention time(HRT) of 8 days yielded the best treatment efficiencies with BOD5 removal of 91 %, TN removal of 96 %, total and fecal coliforms (TC and FC) removal of more than 99 % and cadmium removal of 99.7 %. The treatment performance was found to follow first-order reaction rate, in which the k20 values of BOD5, COD, TN, TC, FC and Cd were 0.201, 0.121, 0.247, 0.346, 0.354 and 0.690 d−1, respectively. Mass balance analysis, based on TN contents of the plant biomass and dissolved oxygen (DO) and oxidation– reduction potential (ORP) values, suggested that 88 % of the input TN were uptaken by the plant biomass; 8 % removed by nitrification–denitrification reactions and adsorption on the wetland media, while the remaining 4 % were discharged with the effluent.
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