Energy Recovery Of Grass Biomass
Author(s)
S. Oldenburg, L. Westphal & I. Körner
Abstract
Not only due to the actual climate change, but also in consideration of
exhaustible resources, alternative energy supplies for the steadily growing
energy demand need to be found. The main emphasis should be placed on the
substitution of fossil fuels with agricultural by-products and other organic
materials.
The utilisation of fresh grass or grass silage of extensively cultivated farm
land especially has great potential as an energy feedstock, as in agriculture this
bio-resource is currently considered a waste material and is neither economically
nor ecologically utilised in an efficient way. Additionally, the lawn-clippings,
which are accumulating as communal and private waste could be used for energy
production since many local authorities have problems with utilising this
gramineous waste. Thus, for anaerobic digestion big amounts of grass biomass
and lawn substrates are available from farmers and landscape conservation.
In order to evaluate the suitability of this material for biogas plants in the first
place a detailed inventory needs to be conducted. This was exemplarily done for
the Hamburg District Bergedorf (155 km2). The result shows that approximately
10,000 Mg/a of grass and lawn clippings could theoretically be made available.
By laboratory investigations in batch tests the theoretical biogas potentials of
selected grass and lawn substrates were determined. A statement about the
suitability of the substrates for anaerobic digestion is made in this paper. The
biogas potentials are between 325 and 720 standardized l per kg organic dry
matter (l/kg ODM), depending on the sampling location, mowing time, grass
species etc. For example, the biogas potentials for clippings from the dikes were
in a range comparable with corn silage between 420 to 700 l/kg ODM.
Additionally the problem of seasonal accumulation of grass biomass including
the influence of storage on the initial material is considered in this paper.
Keywords: grass, lawn, digestion, biogas potential.
Keywords
grass, lawn, digestion, biogas potential
Related Book
Other papers in this volume
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