After treatment of landfill leachate in peat filters

Abstract

The main objective of this study was to determine the treatment capacity of well mineralised Sphagnum peat in order to reduce BOD and COD values and nutrient concentration in landfill leachate. The peat filters were suitable for the reduction (up to 93%) of ammonia nitrogen. Good results were obtained in the reduction of total phosphorus from both raw and pre-treated leachate (up to 81% and 70-99% respectively). The purification rate of the landfill leachate depended on the contamination rate - the outflow results were better with pre-treated leachate, and the results also improved due to the lowering of the flow rate (on average by 60 times). Therefore, it is recommended that peat filters be used in combination with conventional treatment methods, e.g. as soil filters of subsurface flow constructed wetlands for the secondary or tertiary treatment of the leachate.