Remediation Of Soils Polluted By Industrial
Activities Utilizing Hydrothermally Treated
Calcareous Fly Ashes
Author(s)
A. Moutsatsou, A. Karathanasis & V. Protonotarios
Abstract
The current research investigates the effect of treated fly ash as a synthesized
zeolite on remediating soils polluted with a variety of heavy metals and
metalloids (As, Pb, Cu, Zn, Fe and Mn). In particular, 4 types of ‘zeolites’ were
synthesized by hydrothermal treatment, using sodium hydroxide solution, of a
calcareous fly ash derived from Lignite-Fired Power Plants (Ptolemaida and
Megalopolis Stations, Greece): two with excess of sodium hydroxide in a
solid/liquid ratio of 50g L-1 and two with excess of fly ash in a solid/liquid ratio
of 100g L-1. Soil samples were obtained from a former mining site at the city of
Lavrion, Greece. Mobilization and transfer of metals to the retention agents was
undertaken using HCl aq 1M and Na2EDTA 0.1M. Retention results were
satisfactory with respect to As, Pb, Cu, Mn. The different metal formations in
contaminated soil were found to be of major importance for the effectiveness of
the overall process. Another important factor was found to be the soil-solventadditive
interaction and the pH of the final liquid and solid products. The latter
were solidified either on their own, or by utilizing additives such as lime and
cement.
Keywords: soil pollution, metals, metalloids, soil washing, lignite fly ash,
alkaline activation, synthesized zeolites.
1 Introduction
Metals and metalloids such as Pb, As, Cu, Zn, Fe and Mn have been recognized
as an important environmental hazard, primarily in the area of public health
Keywords
soil pollution, metals, metalloids, soil washing, lignite fly ash,
alkaline activation, synthesized zeolites.
Related Book
Other papers in this volume
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