The July 2006 increase in the price of electricity repurchase has given a boost to biogas production through methanization. This will delight farmers in western France (Brittany, the Loire Country, and Lower Normandy) who produce more than 50% of the country’s livestock manure.
However, in the zones where livestock raising is the most intensive, the priority goes to removing organic nitrogen to limit water pollution. Yet anaerobic digestion to produce methane does not affect the stocks of nitrogenous matter responsible for the eutrophication of the aquatic environment.
An ambitious project
In Rennes, within the DIGESTAERO* project, a PhD dissertation is being conducted in collaboration with Breton industry leaders to combine the processes of methanization and biological nitrogen removal by nitrification and denitrification. These processes already exist in the food processing industry (distilleries, fabrication of dairy products), but they are not used in the manure treatment context. Indeed, to limit installation costs, the digesters should be able to be integrated into biological nitrogen removal units that already exist on the farm.
Moreover, the treatment unit should take into account inputs that vary substantially in terms of type and composition. For example, an effluent’s rate of biodegradable material varies from 30% to 40%.
- Equip livestock breeders in 2009
First, an experimental pilot made up of two 100-liter tanks was developed to study the phenomena involved and then optimize the processes. At the same time, a numeric model was designed first to identify the important parameters and then to define the optimal industry for the process. Today, the tool provides a good response to the variations in the liquid effluent composition. A first industrial prototype should come out in 2009 so that it can be adjusted to full-size operation. This will be the last step before the industrial development of this new process.
- Methanization: gains at all levels
With 300 million tons per year of animal manure from livestock breeding, France has one of the greatest potentials of agricultural biogas production in Europe. For example, the digestion of 1 m3 of pig liquid manure produces approximately 25 kWh as electricity and as much as heat. Since July 2006, each kilowatt is bought back up to 0.14 euros, instead of the 0.05 euros paid initially. These gains are also important for the environment since methanization can reduce greenhouse gas emissions from a livestock operation. Finally, odors are also reduced with manure management.
- Note this on your schedule:
«What development model for the methanization of livestock effluents is needed in France?" This is the theme of the conference organized in Rennes by the Cemagref, INRA, the University of Southern Brittany, Valétec, and Odipure, to be held on 21 November 2008. The debate will center around the results of the DIGESTAERO project .
* DIGESTAERO, a project financed by the ANR, associates the Cemagref, the Narbonne INRA, the University of Southern Brittany, and two Breton industries: Valétec and Odipure.
Marie Signoret | alfa
New 3-D model predicts best planting practices for farmers
26.06.2017 | Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign
Fighting a destructive crop disease with mathematics
21.06.2017 | University of Cambridge
Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.
For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...
What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.
To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...
The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....
A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...
Physics supports biology: Researchers from PTB have developed a model system to investigate friction phenomena with atomic precision
Friction: what you want from car brakes, otherwise rather a nuisance. In any case, it is useful to know as precisely as possible how friction phenomena arise –...
21.07.2017 | Event News
19.07.2017 | Event News
12.07.2017 | Event News
21.07.2017 | Earth Sciences
21.07.2017 | Power and Electrical Engineering
21.07.2017 | Physics and Astronomy