Paper details

Title:

Carbon Dynamics of Anaerobic Residues from Biogas Plants Using Energy Crops

Author(s):

Sensel, K., Nielsen, K., Wragge, V., Rühlmann, J.

Document(s):

Abstract:

The short term C­mineralization of two different biogas residues under anaerobic and aerobic conditions were investigated. The residues derived from one liquid fermentation biogas plant fermenting maize silage and cattle manure and one dry fermentation biogas plant fermenting sole maize. The determination of C­mineralization under anaerobic conditions characterizes the residual biogas potential (RBP). The loss of carbon through biogas formation was measured at two different temperatures. The total amount of residual biogas after 90 d evolved was higher at 38 °C than at 20 °C. The gas formation rate at 38 °C decreased considerably after 20 d. The biogas residue of the dry fermentation biogas plant (BR dry) showed a higher RBP in comparison to the biogas residue of the liquid fermentation biogas plant (BR liquid). An aerobic incubation experiment with agricultural residues was used to determine C­mineralization after their application in soil. The mineralized carbon of the different substrates added to soil was calculated on the base of the CO2­exhalation (soil respiration). Solid dung (rotten) evolved least CO2­C, amounting to 13 % of added C followed by BR liquid (22 %), cattle manure (48 %) and BR dry (55 %).

Keywords:

agricultural residues, anaerobic digestion, biogas, energy crops, batch reactors, C-mineralization

Topic:

Biomass Conversion Technologies for Heating, Electricity and Chemicals                  

Subtopic:

Recycling of conversion residues (session 1)

Event:

19th European Biomass Conference and Exhibition

Session:

OA3.1

Pages:

855 - 858

ISBN-13:

978-88-89407-55-4

ISBN-10:

88-89407-55-7

Paper DOI:

10.5071/19thEUBCE2011-OA3.1

Price:

FREE