Leaching of heavy metals and barium from forest roads reinforced with fly ash

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http://hdl.handle.net/10138/303760

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Lindroos , A-J , Ryhti , K , Kaakkurivaara , T , Uusitalo , J & Helmisaari , H-S 2019 , ' Leaching of heavy metals and barium from forest roads reinforced with fly ash ' , Silva Fennica , vol. 53 , no. 2 , 10088 . https://doi.org/10.14214/sf.10088

Title: Leaching of heavy metals and barium from forest roads reinforced with fly ash
Author: Lindroos, Antti-Jussi; Ryhti, Kira; Kaakkurivaara, Tomi; Uusitalo, Jori; Helmisaari, Helja-Sisko
Contributor: University of Helsinki, Ecosystem processes (INAR Forest Sciences)
University of Helsinki, Department of Forest Sciences
Date: 2019-04-25
Language: eng
Number of pages: 14
Belongs to series: Silva Fennica
ISSN: 0037-5330
URI: http://hdl.handle.net/10138/303760
Abstract: The aim of this study was to determine the effect of leaching of heavy metals (Cr, As, Cd, Cu, Ni, Pb, Zn, Co, Mo) and earth-alkaline metal, barium (Ba), on the percolation and ditch water quality from the forest roads that contained ash in the road structures. Water quality was studied in the immediate vicinity below the ash layers as well as deeper in the road structure. Water quality was also determined in the drainage water in ditches that crossed the forest roads. A mixture of wood and peat based fly ash was used in the road structures. The treatments were: 1) no ash, 2) a 15 cm layer of ash/gravel mixture, 3) a 20 cm layer of ash/ gravel mixture, 4) a 25 cm layer of ash, and 5) a 50 cm layer of ash. Large variation in the concentrations of Cr, As, Cu, Ni, Pb, Mo and Ba in the percolation water, even within the same treatment, caused difficulties to generalize the results. The concentrations of Cr, As, Ni, Pb, Mo and Ba in water samples were high in some treatment plot lysimeters containing ash compared to the control (no ash). On the other hand, many lysimeters had low and similar concentrations in water samples in the treatment plots containing ash compared to concentrations in the control plots. The ash in the roads did not affect the concentrations in the ditches. The leaching is uneven and seems to take place only from some parts of the ash layer. Risk for leaching is minimal if such parts are not widely spread.
Subject: lysimeter
fly ash
recycling
forest road rehabilitation
environmental impact assessment
low-volume road
WOOD ASH
NUTRIENT STATUS
CONIFEROUS STANDS
FERTILIZATION
GROWTH
SOIL
BIOMASS
PEAT
CADMIUM
4112 Forestry
1172 Environmental sciences
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