Innovative Use of Biological Phytoremediation Systems for the Treatment of Landfill Leachate

Description:Landfill leachate is generated when precipitation percolates through the landfill and takes up the organic and inorganic constituents stored within. The resulting leachate contains elevated concentrations of constituents such as ammonia nitrogen and suspended solids that may potentially be deleterious if released to the environment. Leachate is generated during both the active phase of landfill operations and following closure, necessitating an ongoing, long-term leachate management strategy. SYLVIS has been working with Ecowaste on managing the leachate produced at the site through an innovative soil-plant phytoremediation system and a subsurface constructed wetland. The soil-plant system consists of vegetated treatment plots that have been established deployed across closed cells of the landfill and irrigated with leachate. The fabricated soil, comprised of biosolids, sand and woodchips serves as a growing medium and retains chemical constituents, while the vegetation consisting of hybrid poplars, coppice willows and forage grasses assimilates nutrients and reduces the volume of leachate through evapotranspiration. The primary function of the subsurface constructed wetland at Ecowaste is to reduce the concentrations of ammonia nitrogen and suspended solids in the leachate. The wetland consists of a vegetated pond, which utilizes wetland plants species for nutrient uptake, and a denitrification bed that utilizes a carbon source to support microbial denitrification processes. For over eight years the soil-plant system has successfully treated the leachate at Ecowaste reducing the concentrations of key leachate constituents specified in the landfill's Operational Certificate to below discharge limits.

Authors: Denis Matiichine

Subjects:

Tags:AC14,2014 Annual Conference,landfill leachate,AC2014

Citation:Stream N. 14.2.

Publication Date:May 6th, 2014 Upload Date:Jun 30th, 2014

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