Conference proceedings article
Heavy metals in urban green cuttings



Publication Details
Authors:
Piepenschneider, M.; Hensgen, F.; Wachendorf, M.; De Moor, S.; Michels, E.; Meers, E.
Editor:
Hopkins, A.; Collins, R.P.; Fraser, M.D.; King, V.R.; Lloyd, D.C.; Moorby, J.M.; Robson, P.R.H.
Publisher:
IBERS
Place:
Aberystwyth
Publication year:
2014
Pages range:
477-479
Book title:
EGF at 50: The Future of European Grasslands
Title of series:
Grassland Science in Europe
Volume number:
19
ISBN:
978-0-9926940-1-2

Abstract
Urban grass cuttings are a potential source for energy production from biomass. However, concerns about heavy metal contamination, amongst others, have hampered the practical implementation in the past. At 10 sites within the city of Kassel, samples of roadside verge green cuttings were taken from a 2-cut and a 4-cut regime to analyse the heavy metal content (Cd, Cr, Cu, Mn, Pb, Zn). Elemental concentrations were measured with ICP-OES after microwave digestion. Cd and Pb could barely be detected. Cr contents were lower than in common agricultural grass and Cu as well as Zn contents were slightly higher. Mn contents meet the agricultural reference value. All elements fall below the limiting value of DIN EN 14961-6 for herbaceous biofuels (Mn is not considered by the DIN). Differences between 2- and 4-cut regimes were not statistically significant. Heavy metal contamination of municipal green cuttings is of little significance regarding energy recovery. Considering implementation opportunities of suitable technology is suggested.

Last updated on 2019-01-07 at 10:21