Treatment of landfill leachate using an aerated, horizontal subsurface-flow constructed wetland

Irrigation with Waste Water Treated by Constructed Wetlands

“…The CW studied by Ham et al (2007) and Nivala et al (2007) showed that in summer and the growing season, higher temperatures caused the increase of wetland performance for wastewater contaminant removal. Hence, to decrease effluent levels in the study wetlands, it is suggested that this system is operated in summer and the season growing for cold climate areas.…”

“…Aerated subsurface-flow constructed wetlands were presented as a viable low-cost treatment alternative for the treatment of landfill leachate by Nivala et al (2007). This system can be implemented even during subfreezing temperatures if it is insulated and aerated enough.…”

Ecosystem Technologies and Ecoremediation for Water Protection, Treatment and Reuse

“…The inadequate oxygen transfer of typical subsurface flow wetlands resulted in the progress of improved treatment systems, which are able to assure adequate oxygen levels for nitrification, degradation of organic matter, and prevention of P leaching. The systems include introduction of oxygen to the wetland by means of regular water level oscillations, passive air pumps or powered mechanical aeration of the reed bed (Nivala et al, 2007). Yet, the elimination of nitrogen in ET has been enhanced by the different flows, cascades, open areas, and with the application of recirculation of the treated outflow back to the inflow (Griessler Bulc & Šajn-Slak, 2009;Griessler Bulc et al, 2011).…”

Performance of Four Full-Scale Artificially Aerated Horizontal Flow Constructed Wetlands for Domestic Wastewater Treatment

“…The general efficacy of the approach towards enhancing nitrification has been demonstrated predominately at pilot scale for a range of feed water types including synthetic wastewater [10,11], heavily polluted river water [12], and municipal secondary sewage [8]. Illustrations of the efficacy of the technology have also been presented at full-scale in terms of the treatment of landfill leachate [13], industrial wastewater [14], and tertiary treatment of municipal sewage [2]. In the latter, hydraulic loading rates are considerably higher than those utilised elsewhere with typical rates of 0.2-0.9 m/d reported in the UK [15] compared to 0.001-0.049 m/d for the sites treating industrial wastewaters [14].…”