Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) The study of the variability of biomass from plants of the Elodea genus from a river in Germany over a period of two hydrological years for investigating their suitability for biogas production
Autor Zehnsdorf, A.; Moeller, L.; Stärk, H.-J.; Auge, H.; Röhl, M.; Stinner, W.;
Journal / Serie Energy, Sustainability and Society
Erscheinungsjahr 2017
Department BZF; ANA; UBZ;
Band/Volume 7
Sprache englisch;
POF III (gesamt) T13; T11;
Keywords Elodea nuttallii; Elodea canadensis; Waterweed; Neophyte; Aquatic biomass; Aquatic macrophytes; Hydrological year; Biogas production
UFZ Querschnittsthemen RU6
Abstract

Background

Aquatic plants are an important component of aquatic ecosystems. They are valuable for the oxygen and carbon dioxide household and generate habitats especially for small fish and other small organisms. However, problems for the maintenance of water bodies can result from mass occurrences of these plants. Invasive neophytes - such as members of the Elodea genus - are particularly problematic in this regard. Aquatic plants need to be harvested regularly to ensure that water bodies remain usable and to safeguard flood protection for flowing water bodies. Energy can be produced from the harvested material by anaerobic digestion in biogas plants. Therefore, it is beneficial to know the best time for harvesting in this context.

Methods

To identify the best time for harvesting, samples of the Elodea stock in the river Parthe in Leipzig-Schönefeld were taken each week over the course of the two hydrological years 2015 and 2016. The composition of these samples was analyzed in the laboratory. In the second hydrological year, three samples from surface areas of 1 m2 were also harvested once each month in order to determine the biomass yield per unit area.

Results

The best harvesting time for energy production from Elodea biomass in Germany is in the summer months (June to September). During this period, the specific yield of 0.5–0.7 kg VS/m2 is relatively high and the Elodea biomass contains the highest fractions of volatile solids (80.1 ± 2.3%), high contents of plant nutrients (N 35.9 ± 4.0 g/kg TS; P 6.1 ± 1.4 g/kg TS; and K 47.7 ± 8.0 g/kg TS), and low concentrations of heavy metals (Cr ≤8.9 mg/kg TS, Cd ≤0.9 mg/kg TS, Cu ≤120 mg/kg TS, Ni ≤30 mg/kg TS, Pb ≤8.6 mg/kg TS, and Zn ≤439 mg/kg TS).

Conclusions

Energy production from Elodea biomass is feasible. This biomass also provides the nutrients and trace elements necessary for the digestion in the anaerobic process.

ID 18812
dauerhafte UFZ-Verlinkung http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=18812
Zehnsdorf, A., Moeller, L., Stärk, H.-J., Auge, H., Röhl, M., Stinner, W. (2017):
The study of the variability of biomass from plants of the Elodea genus from a river in Germany over a period of two hydrological years for investigating their suitability for biogas production
Energy Sustain. Soc. 7 , art. 15