After Treatment Of Landfill Leachate In
Peat Filters
Author(s)
M. Kõiv, M. Kriipsalu & Ü. Mander
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.
Keywords: ammonia-nitrogen, BOD, COD, peat filter, pre-treated landfill
leachate, raw landfill leachate, total nitrogen, total phosphorus.
1 Introduction
Peat is partially fossilized decomposed plant matter that transforms in wet areas
in the absence of oxygen. Compared to mineral soils, peat has a very high
organic content (60% carbon). Peat has a surface area of >200 m2 g-1 and is
highly porous (80-90%) [1].
In Estonia, peat lands cover 22% of total land area. Estonian peat resources
are estimated at 2.4 billion tonnes, of which 0.2 billion tonnes are less
decomposed, and 1.4 billion tonnes are well decomposed [2].
Keywords
ammonia-nitrogen, BOD, COD, peat filter, pre-treated landfillleachate, raw landfill leachate, total nitrogen, total phosphorus.
Related Book
Other papers in this volume
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