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 data unearths pesticide peril in beehives
21.04.2017 | Cornell University
New rice fights off drought
04.04.2017 | RIKEN
More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...
Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
20.04.2017 | Event News
18.04.2017 | Event News
03.04.2017 | Event News
25.04.2017 | Earth Sciences
25.04.2017 | Life Sciences
25.04.2017 | Earth Sciences