Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New super bacterium doubles hydrogen gas production

14.04.2010
Hydrogen gas is today used primarily for manufacturing chemicals, but a bright future is predicted for it as a vehicle fuel in combination with fuel cells.

In order to produce hydrogen gas in a way that is climate neutral, bacteria are added to forestry or household waste, using a method similar to biogas production. One problem with this production method is that hydrogen exchange is low, i.e. the raw materials generate little hydrogen gas.

Now, for the first time, researchers have studied a newly discovered bacterium that produces twice as much hydrogen gas as the bacteria currently used. The results show how, when and why the bacterium can perform its excellent work and increase the possibilities of competitive biological production of hydrogen gas.

"There are three important explanations for why this bacterium, which is called Caldicellulosiruptor saccharolyticus, produces more hydrogen gas than others. One is that it has adapted to a low-energy environment, which has caused it to develop effective transport systems for carbohydrates and the ability to break down inaccessible parts of plants with the help of enzymes. This in turn means it produces more hydrogen gas. The second explanation is that it can cope with higher growth temperatures than many other bacteria. The higher the temperature, the more hydrogen gas can be formed", summarises Karin Willquist, doctoral student in Applied Microbiology at Lund University. She will soon be presenting a thesis on the subject.

The third explanation is that the CS bacterium can still produce hydrogen gas even in difficult conditions, for example high partial hydrogen pressure, which is necessary if biological hydrogen gas production is to be financially viable.

On the other hand, the bacterium does not like high concentrations of salt or hydrogen gas. These affect the signalling molecules in the bacterium and, in turn, the metabolism in such a way that it produces less hydrogen gas.

"But it is possible to direct the process so that salt and hydrogen gas concentrations do not become too high", points out Karin Willquist.

When hydrogen is used as an energy carrier, for example in car engines, water is the only by-product. However, because the hydrogen gas production itself, if it is carried out by a conventional method, consumes large amounts of energy, hydrogen gas is still not a very environmentally friendly energy carrier.

Reforming of methane or electrolysis of water are currently the most common ways to produce hydrogen gas. However, methane gas is not renewable and its use leads to increased carbon dioxide emissions. Electrolysis requires energy, usually acquired from fossil fuels, but also sometimes from wind or solar power. Hydrogen gas can also be generated from wind power, which is an environmentally friendly alternative, even if wind power is controversial for other reasons.

"If hydrogen gas is produced from biomass, there is no addition of carbon dioxide because the carbon dioxide formed in the production is the same that is absorbed from the atmosphere by the plants being used. Bio-hydrogen gas will probably complement biogas in the future", predicts Karin Willquist.

Today there are cars that run on hydrogen gas, e.g. the Honda FCX, even if they are few in number. The reason for this is that it is too expensive to produce hydrogen gas and there is no functioning hydrogen infrastructure.

"A first step towards a hydrogen gas society could be to mix hydrogen gas with methane gas and use the existing methane gas infrastructure. Buses in Malmö, for example, drive on a mixture of hydrogen gas and methane gas", says Karin Willquist.

Caldicellulosiruptor saccharolyticus was isolated for the first time in 1987 in a hot spring in New Zealand. It is only recently that researchers have really begun to realise the potential of the bacterium.

or more information, please contact Karin Willquist, doctoral student, Applied Microbiology, +46 (0)46 222 06 49, +46 (0)735 37 55 68, Karin.Willquist@tmb.lth.se,

Supervisor Ed van Niel, Senior Lecturer in Applied Microbiology, +46 (0)46 222 0619, Ed.van_Niel@tmb.lth.se.

Pressofficer Kristina Lindgärde; kristina.lindgarde@kansli.lth.se; +46-709 75 35 00

Kristina Lindgärde | idw
Further information:
http://www.vr.se

More articles from Life Sciences:

nachricht Symbiotic bacteria: from hitchhiker to beetle bodyguard
28.04.2017 | Johannes Gutenberg-Universität Mainz

nachricht Nose2Brain – Better Therapy for Multiple Sclerosis
28.04.2017 | Fraunhofer-Institut für Grenzflächen- und Bioverfahrenstechnik IGB

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

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...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

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...

Im Focus: Deep inside Galaxy M87

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...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

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...

Im Focus: Microprocessors based on a layer of just three atoms

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...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Fighting drug resistant tuberculosis – InfectoGnostics meets MYCO-NET² partners in Peru

28.04.2017 | Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

 
Latest News

Wireless power can drive tiny electronic devices in the GI tract

28.04.2017 | Medical Engineering

Ice cave in Transylvania yields window into region's past

28.04.2017 | Earth Sciences

Nose2Brain – Better Therapy for Multiple Sclerosis

28.04.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>