A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Low-cost physicochemical treatment for removal of ammonia, phosphate and nitrate contaminants from landfill leachate
Four low-cost materials, oyster shells, pumice stone, sand and zeolite were employed as adsorbents in an adsorption batch assays investigating the removal of ammonia, phosphate and nitrate from an aqueous solution. These compounds were chosen as they represent typical compounds found in landfill leachate (LFL). Assay performance was evaluated by the Langmuir and Freundlich adsorption isotherms. The top two materials, oyster shells and pumice stone, were employed as adsorbents in a fixed-bed column trial examining the effect of bed height and flow rate on the treatment of a synthetic LFL. The trial concluded that the highest rates of adsorption were achieved using bed heights of 20 cm with a flow rate of 5 mL min−1. After optimization, the system was employed for the treatment of LFL from Powerstown landfill, Carlow, Ireland. Ammonia and nitrate were effectively removed by both adsorption materials resulting in a reduction of influent ammonia and nitrate concentrations to below the national discharge limits set for these compounds of ≤4 mg L−1 and ≤50 mg L−1, respectively. In contrast, although similar high removal efficiencies were observed for phosphate, these rates were not maintained during the test period with overall results indicating reduced phosphate adsorption in comparison to the other compounds tested.
Low-cost physicochemical treatment for removal of ammonia, phosphate and nitrate contaminants from landfill leachate
Four low-cost materials, oyster shells, pumice stone, sand and zeolite were employed as adsorbents in an adsorption batch assays investigating the removal of ammonia, phosphate and nitrate from an aqueous solution. These compounds were chosen as they represent typical compounds found in landfill leachate (LFL). Assay performance was evaluated by the Langmuir and Freundlich adsorption isotherms. The top two materials, oyster shells and pumice stone, were employed as adsorbents in a fixed-bed column trial examining the effect of bed height and flow rate on the treatment of a synthetic LFL. The trial concluded that the highest rates of adsorption were achieved using bed heights of 20 cm with a flow rate of 5 mL min−1. After optimization, the system was employed for the treatment of LFL from Powerstown landfill, Carlow, Ireland. Ammonia and nitrate were effectively removed by both adsorption materials resulting in a reduction of influent ammonia and nitrate concentrations to below the national discharge limits set for these compounds of ≤4 mg L−1 and ≤50 mg L−1, respectively. In contrast, although similar high removal efficiencies were observed for phosphate, these rates were not maintained during the test period with overall results indicating reduced phosphate adsorption in comparison to the other compounds tested.
Low-cost physicochemical treatment for removal of ammonia, phosphate and nitrate contaminants from landfill leachate
Morris, Sinead (author) / Garcia-Cabellos, Guiomar (author) / Ryan, David (author) / Enright, Deirdre (author) / Enright, Anne-Marie (author)
Journal of Environmental Science and Health, Part A ; 54 ; 1233-1244
2019-10-15
12 pages
Article (Journal)
Electronic Resource
English
Removal of Ammonia-Nitrogen Contained in Landfill Leachate by Ammonia Stripping (II)
| British Library Online Contents | 2002
Removal of Ammonia-Nitrogen Contained in Landfill Leachate by Ammonia Stripping(I)
| British Library Online Contents | 2000
Biological Nitrogen Removal From Landfill Leachate
| British Library Conference Proceedings | 1993
Landfill Technology - Ammonia removal from high strength leachate using a sequencing batch reactor
| Online Contents | 1999